From c416aa9f08b0ff276e709df07de7a7a44baab768 Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Mon, 7 Jun 2021 20:12:41 -0700
Subject: [PATCH 1/9] Initial support for module: node12

---
 src/compiler/binder.ts                        |   2 +-
 src/compiler/checker.ts                       |  89 +++++++------
 src/compiler/commandLineParser.ts             |   4 +-
 src/compiler/diagnosticMessages.json          |  16 ++-
 src/compiler/factory/emitHelpers.ts           |   2 +-
 src/compiler/factory/nodeFactory.ts           |   1 +
 src/compiler/factory/utilities.ts             |   6 +-
 src/compiler/moduleNameResolver.ts            |  21 ++-
 src/compiler/moduleSpecifiers.ts              |   8 ++
 src/compiler/program.ts                       |  63 ++++++++-
 src/compiler/transformer.ts                   |   3 +
 src/compiler/transformers/classFields.ts      |   2 +-
 src/compiler/transformers/jsx.ts              |   2 +-
 .../transformers/module/esnextAnd2015.ts      | 122 +++++++++++++++++-
 src/compiler/transformers/module/module.ts    |  12 +-
 src/compiler/transformers/module/node.ts      |  84 ++++++++++++
 src/compiler/tsconfig.json                    |   1 +
 src/compiler/types.ts                         |  38 +++++-
 src/compiler/utilities.ts                     |  44 ++++++-
 src/compiler/utilitiesPublic.ts               |   2 +-
 src/compiler/watch.ts                         |   2 +-
 src/harness/compilerImpl.ts                   |   2 +-
 src/harness/harnessIO.ts                      |   6 +-
 .../codefixes/convertFunctionToEs6Class.ts    |   2 +-
 src/services/codefixes/convertToEs6Module.ts  |   2 +-
 .../codefixes/fixModuleAndTargetOptions.ts    |   4 +-
 src/services/codefixes/fixSpelling.ts         |   8 +-
 src/services/codefixes/importFixes.ts         |   7 +-
 src/services/completions.ts                   |  10 +-
 src/services/documentRegistry.ts              |   2 +-
 src/services/stringCompletions.ts             |   6 +
 src/services/transpile.ts                     |   2 +-
 src/services/types.ts                         |   6 +
 src/services/utilities.ts                     |   2 +-
 .../unittests/config/commandLineParsing.ts    |   2 +-
 .../reference/api/tsserverlibrary.d.ts        |  55 +++++++-
 tests/baselines/reference/api/typescript.d.ts |  55 +++++++-
 .../awaitInNonAsyncFunction.errors.txt        |   8 +-
 ...lpersWithLocalCollisions(module=node12).js |  27 ++++
 ...ersWithLocalCollisions(module=nodenext).js |  27 ++++
 ...portCallExpressionErrorInES2015.errors.txt |  12 +-
 ...mportCallExpressionNestedES2015.errors.txt |   8 +-
 ...portCallExpressionNestedES20152.errors.txt |   8 +-
 ...eta(module=commonjs,target=es5).errors.txt |  52 ++++----
 ...(module=commonjs,target=esnext).errors.txt |  52 ++++----
 .../reference/nodeModules1(module=node12).js  |  58 +++++++++
 .../nodeModules1(module=node12).symbols       |  32 +++++
 .../nodeModules1(module=node12).types         |  36 ++++++
 .../nodeModules1(module=nodenext).js          |  58 +++++++++
 .../nodeModules1(module=nodenext).symbols     |  32 +++++
 .../nodeModules1(module=nodenext).types       |  36 ++++++
 ...nodeModulesDynamicImport(module=node12).js |  39 ++++++
 ...odulesDynamicImport(module=node12).symbols |  22 ++++
 ...eModulesDynamicImport(module=node12).types |  26 ++++
 ...deModulesDynamicImport(module=nodenext).js |  39 ++++++
 ...ulesDynamicImport(module=nodenext).symbols |  22 ++++
 ...odulesDynamicImport(module=nodenext).types |  26 ++++
 ...xportAssignments(module=node12).errors.txt |  23 ++++
 ...ModulesExportAssignments(module=node12).js |  30 +++++
 ...esExportAssignments(module=node12).symbols |  16 +++
 ...ulesExportAssignments(module=node12).types |  18 +++
 ...ortAssignments(module=nodenext).errors.txt |  23 ++++
 ...dulesExportAssignments(module=nodenext).js |  30 +++++
 ...ExportAssignments(module=nodenext).symbols |  16 +++
 ...esExportAssignments(module=nodenext).types |  18 +++
 ...edNameCollisions(module=node12).errors.txt |  38 ++++++
 ...sGeneratedNameCollisions(module=node12).js |  48 +++++++
 ...ratedNameCollisions(module=node12).symbols |  38 ++++++
 ...neratedNameCollisions(module=node12).types |  42 ++++++
 ...NameCollisions(module=nodenext).errors.txt |  38 ++++++
 ...eneratedNameCollisions(module=nodenext).js |  48 +++++++
 ...tedNameCollisions(module=nodenext).symbols |  38 ++++++
 ...ratedNameCollisions(module=nodenext).types |  42 ++++++
 ...ModulesImportAssignments(module=node12).js |  57 ++++++++
 ...esImportAssignments(module=node12).symbols |  43 ++++++
 ...ulesImportAssignments(module=node12).types |  51 ++++++++
 ...dulesImportAssignments(module=nodenext).js |  57 ++++++++
 ...ImportAssignments(module=nodenext).symbols |  43 ++++++
 ...esImportAssignments(module=nodenext).types |  51 ++++++++
 ...elpersCollisions(module=node12).errors.txt |  36 ++++++
 ...sImportHelpersCollisions(module=node12).js |  46 +++++++
 ...rtHelpersCollisions(module=node12).symbols |  40 ++++++
 ...portHelpersCollisions(module=node12).types |  48 +++++++
 ...persCollisions(module=nodenext).errors.txt |  36 ++++++
 ...mportHelpersCollisions(module=nodenext).js |  46 +++++++
 ...HelpersCollisions(module=nodenext).symbols |  40 ++++++
 ...rtHelpersCollisions(module=nodenext).types |  48 +++++++
 ...lpersCollisions2(module=node12).errors.txt |  32 +++++
 ...ImportHelpersCollisions2(module=node12).js |  39 ++++++
 ...tHelpersCollisions2(module=node12).symbols |  22 ++++
 ...ortHelpersCollisions2(module=node12).types |  22 ++++
 ...ersCollisions2(module=nodenext).errors.txt |  32 +++++
 ...portHelpersCollisions2(module=nodenext).js |  39 ++++++
 ...elpersCollisions2(module=nodenext).symbols |  22 ++++
 ...tHelpersCollisions2(module=nodenext).types |  22 ++++
 ...lpersCollisions3(module=node12).errors.txt |  27 ++++
 ...ImportHelpersCollisions3(module=node12).js |  38 ++++++
 ...tHelpersCollisions3(module=node12).symbols |  20 +++
 ...ortHelpersCollisions3(module=node12).types |  20 +++
 ...ersCollisions3(module=nodenext).errors.txt |  27 ++++
 ...portHelpersCollisions3(module=nodenext).js |  38 ++++++
 ...elpersCollisions3(module=nodenext).symbols |  20 +++
 ...tHelpersCollisions3(module=nodenext).types |  20 +++
 ...odulesImportMeta(module=node12).errors.txt |  23 ++++
 .../nodeModulesImportMeta(module=node12).js   |  32 +++++
 ...deModulesImportMeta(module=node12).symbols |  20 +++
 ...nodeModulesImportMeta(module=node12).types |  24 ++++
 ...ulesImportMeta(module=nodenext).errors.txt |  23 ++++
 .../nodeModulesImportMeta(module=nodenext).js |  32 +++++
 ...ModulesImportMeta(module=nodenext).symbols |  20 +++
 ...deModulesImportMeta(module=nodenext).types |  24 ++++
 ...ronousCallErrors(module=node12).errors.txt |  43 ++++++
 ...lesSynchronousCallErrors(module=node12).js |  54 ++++++++
 ...nchronousCallErrors(module=node12).symbols |  58 +++++++++
 ...SynchronousCallErrors(module=node12).types |  68 ++++++++++
 ...nousCallErrors(module=nodenext).errors.txt |  43 ++++++
 ...sSynchronousCallErrors(module=nodenext).js |  54 ++++++++
 ...hronousCallErrors(module=nodenext).symbols |  58 +++++++++
 ...nchronousCallErrors(module=nodenext).types |  68 ++++++++++
 ...lesTopLevelAwait(module=node12).errors.txt |  34 +++++
 ...nodeModulesTopLevelAwait(module=node12).js |  36 ++++++
 ...odulesTopLevelAwait(module=node12).symbols |  22 ++++
 ...eModulesTopLevelAwait(module=node12).types |  28 ++++
 ...sTopLevelAwait(module=nodenext).errors.txt |  28 ++++
 ...deModulesTopLevelAwait(module=nodenext).js |  36 ++++++
 ...ulesTopLevelAwait(module=nodenext).symbols |  22 ++++
 ...odulesTopLevelAwait(module=nodenext).types |  28 ++++
 .../parser.forAwait.es2018.errors.txt         |   8 +-
 ....1(module=esnext,target=es2015).errors.txt |  12 +-
 ....1(module=system,target=es2015).errors.txt |  12 +-
 ...ons module-kind is out-of-range.errors.txt |   4 +-
 ...nd is out-of-range.oldTranspile.errors.txt |   4 +-
 ...s target-script is out-of-range.errors.txt |   4 +-
 ...pt is out-of-range.oldTranspile.errors.txt |   4 +-
 .../files-containing-json-file.js             |   2 +-
 .../initial-build/include-and-files.js        |   2 +-
 ...r-include-and-file-name-matches-ts-file.js |   2 +-
 ...nclude-of-json-along-with-other-include.js |   2 +-
 .../initial-build/include-only.js             |   2 +-
 .../initial-build/sourcemap.js                |   2 +-
 .../sample1/initial-build/explainFiles.js     |  14 +-
 ...-when-host-can't-provide-terminal-width.js |   2 +-
 ...tatus.DiagnosticsPresent_OutputsSkipped.js |   2 +-
 .../jsxImportSource-option-changed.js         |   2 +-
 ...n-Windows-style-drive-root-is-lowercase.js |   4 +-
 ...n-Windows-style-drive-root-is-uppercase.js |   4 +-
 ...ry-symlink-target-and-import-match-disk.js |   4 +-
 ...le-symlink-target-and-import-match-disk.js |   4 +-
 ...target-matches-disk-but-import-does-not.js |   4 +-
 ...target-matches-disk-but-import-does-not.js |   4 +-
 ...link-target,-and-disk-are-all-different.js |   4 +-
 ...link-target,-and-disk-are-all-different.js |   4 +-
 ...link-target-agree-but-do-not-match-disk.js |   4 +-
 ...link-target-agree-but-do-not-match-disk.js |   4 +-
 ...k-but-directory-symlink-target-does-not.js |   4 +-
 ...s-disk-but-file-symlink-target-does-not.js |   4 +-
 ...ative-information-file-location-changes.js |   4 +-
 ...ImportSource-option-changed-incremental.js |   4 +-
 .../jsxImportSource-option-changed-watch.js   |   4 +-
 ...iles-are-reflected-in-project-structure.js |   4 +-
 .../handle-recreated-files-correctly.js       |   8 +-
 .../should-reflect-change-in-config-file.js   |   6 +-
 ...er-old-one-without-file-being-in-config.js |   2 +-
 ...invoked,-ask-errors-on-it-after-old-one.js |   4 +-
 ...re-old-one-without-file-being-in-config.js |   2 +-
 ...nvoked,-ask-errors-on-it-before-old-one.js |   4 +-
 ...er-old-one-without-file-being-in-config.js |   2 +-
 ...invoked,-ask-errors-on-it-after-old-one.js |   4 +-
 ...re-old-one-without-file-being-in-config.js |   2 +-
 ...nvoked,-ask-errors-on-it-before-old-one.js |   4 +-
 ...nging-module-name-with-different-casing.js |   2 +-
 ...hen-renaming-file-with-different-casing.js |   2 +-
 ...-generated-when-the-config-file-changes.js |   2 +-
 ...when-the-config-file-doesnt-have-errors.js |   2 +-
 ...nerated-when-the-config-file-has-errors.js |   2 +-
 ...-file-opened-and-config-file-has-errors.js |   2 +-
 ...le-opened-and-doesnt-contain-any-errors.js |   2 +-
 ...rs-but-suppressDiagnosticEvents-is-true.js |   2 +-
 ...s-contains-the-project-reference-errors.js |   2 +-
 ...-same-ambient-module-and-is-also-module.js |   2 +-
 ...project-structure-and-reports-no-errors.js |   2 +-
 ...-when-timeout-occurs-after-installation.js |   4 +-
 ...n-timeout-occurs-inbetween-installation.js |   4 +-
 ...hen-json-is-root-file-found-by-tsconfig.js |   2 +-
 ...json-is-not-root-file-found-by-tsconfig.js |   2 +-
 ...-global-error-gerErr-with-sync-commands.js |   2 +-
 ...or-returns-includes-global-error-getErr.js |   2 +-
 ...-includes-global-error-geterrForProject.js |   2 +-
 ...large-file-size-is-determined-correctly.js |   2 +-
 ...t-is-not-open-gerErr-with-sync-commands.js |   2 +-
 ...n-dependency-project-is-not-open-getErr.js |   2 +-
 ...cy-project-is-not-open-geterrForProject.js |   2 +-
 ...-file-is-open-gerErr-with-sync-commands.js |   4 +-
 ...-when-the-depedency-file-is-open-getErr.js |   4 +-
 ...depedency-file-is-open-geterrForProject.js |   4 +-
 ...t-is-not-open-gerErr-with-sync-commands.js |   2 +-
 ...n-dependency-project-is-not-open-getErr.js |   2 +-
 ...cy-project-is-not-open-geterrForProject.js |   2 +-
 ...-file-is-open-gerErr-with-sync-commands.js |   4 +-
 ...-when-the-depedency-file-is-open-getErr.js |   4 +-
 ...depedency-file-is-open-geterrForProject.js |   4 +-
 .../ancestor-and-project-ref-management.js    |  12 +-
 ...disableSourceOfProjectReferenceRedirect.js |   2 +-
 ...port-with-referenced-project-when-built.js |   2 +-
 .../auto-import-with-referenced-project.js    |   2 +-
 ...ssfully-find-references-with-out-option.js |   6 +-
 ...indirect-project-but-not-in-another-one.js |   6 +-
 ...dProjectLoad-is-set-in-indirect-project.js |   6 +-
 ...oes-not-error-on-container-only-project.js |   6 +-
 .../sibling-projects.js                       |   4 +-
 ...solution-is-built-with-preserveSymlinks.js |   2 +-
 ...-and-has-index.ts-and-solution-is-built.js |   2 +-
 ...tion-is-not-built-with-preserveSymlinks.js |   2 +-
 ...-has-index.ts-and-solution-is-not-built.js |   2 +-
 ...solution-is-built-with-preserveSymlinks.js |   2 +-
 ...th-scoped-package-and-solution-is-built.js |   2 +-
 ...tion-is-not-built-with-preserveSymlinks.js |   2 +-
 ...coped-package-and-solution-is-not-built.js |   2 +-
 ...solution-is-built-with-preserveSymlinks.js |   2 +-
 ...le-from-subFolder-and-solution-is-built.js |   2 +-
 ...tion-is-not-built-with-preserveSymlinks.js |   2 +-
 ...rom-subFolder-and-solution-is-not-built.js |   2 +-
 ...solution-is-built-with-preserveSymlinks.js |   2 +-
 ...th-scoped-package-and-solution-is-built.js |   2 +-
 ...tion-is-not-built-with-preserveSymlinks.js |   2 +-
 ...coped-package-and-solution-is-not-built.js |   2 +-
 ...disableSourceOfProjectReferenceRedirect.js |   8 +-
 ...ect-when-referenced-project-is-not-open.js |   4 +-
 ...disableSourceOfProjectReferenceRedirect.js |  12 +-
 ...project-when-referenced-project-is-open.js |   8 +-
 ...ject-is-directly-referenced-by-solution.js |  12 +-
 ...ct-is-indirectly-referenced-by-solution.js |  24 ++--
 ...nced-project-and-using-declaration-maps.js |   4 +-
 ...ot-file-is-file-from-referenced-project.js |   4 +-
 ...indirect-project-but-not-in-another-one.js |  12 +-
 ...dProjectLoad-is-set-in-indirect-project.js |  12 +-
 ...-if-disableReferencedProjectLoad-is-set.js |   6 +-
 ...ces-open-file-through-project-reference.js |  22 ++--
 ...ct-is-indirectly-referenced-by-solution.js |  34 ++---
 ...nction-as-object-literal-property-types.js |   6 +-
 ...row-function-as-object-literal-property.js |   4 +-
 ...ss-when-using-arrow-function-assignment.js |   6 +-
 ...s-when-using-method-of-class-expression.js |   6 +-
 ...ness-when-using-object-literal-property.js |   6 +-
 ...cts-are-open-and-one-project-references.js |  16 +--
 ...ts-have-allowJs-and-emitDeclarationOnly.js |   2 +-
 ...ng-solution-and-siblings-are-not-loaded.js |   2 +-
 ...getting-project-from-orphan-script-info.js |   2 +-
 ...directory-watch-invoke-on-file-creation.js |   8 +-
 ...tion-when-project-compiles-from-sources.js |   4 +-
 ...s-in-typings-folder-and-then-recompiles.js |   2 +-
 ...mpiles-after-deleting-generated-folders.js |   4 +-
 ...ping-when-project-compiles-from-sources.js |   4 +-
 ...s-in-typings-folder-and-then-recompiles.js |   4 +-
 ...mpiles-after-deleting-generated-folders.js |   6 +-
 ...name-in-common-file-renames-all-project.js |   4 +-
 tests/cases/conformance/node/nodeModules1.ts  |  34 +++++
 .../node/nodeModulesDynamicImport.ts          |  23 ++++
 .../node/nodeModulesExportAssignments.ts      |  19 +++
 .../nodeModulesGeneratedNameCollisions.ts     |  25 ++++
 .../node/nodeModulesImportAssignments.ts      |  30 +++++
 .../nodeModulesImportHelpersCollisions.ts     |  30 +++++
 .../nodeModulesImportHelpersCollisions2.ts    |  26 ++++
 .../nodeModulesImportHelpersCollisions3.ts    |  24 ++++
 .../conformance/node/nodeModulesImportMeta.ts |  19 +++
 .../node/nodeModulesSynchronousCallErrors.ts  |  33 +++++
 .../node/nodeModulesTopLevelAwait.ts          |  21 +++
 267 files changed, 4178 insertions(+), 473 deletions(-)
 create mode 100644 src/compiler/transformers/module/node.ts
 create mode 100644 tests/baselines/reference/emitHelpersWithLocalCollisions(module=node12).js
 create mode 100644 tests/baselines/reference/emitHelpersWithLocalCollisions(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModules1(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModules1(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModules1(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModules1(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModules1(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModules1(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesDynamicImport(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesDynamicImport(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesDynamicImport(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesExportAssignments(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesExportAssignments(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesExportAssignments(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesExportAssignments(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesImportAssignments(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesImportAssignments(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportAssignments(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesImportMeta(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesImportMeta(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesImportMeta(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportMeta(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesImportMeta(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesImportMeta(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesImportMeta(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesImportMeta(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).types
 create mode 100644 tests/cases/conformance/node/nodeModules1.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesDynamicImport.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesExportAssignments.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesImportAssignments.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesImportMeta.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts
 create mode 100644 tests/cases/conformance/node/nodeModulesTopLevelAwait.ts

diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
index faefba86582f1..2152f3ec957f7 100644
--- a/src/compiler/binder.ts
+++ b/src/compiler/binder.ts
@@ -2374,7 +2374,7 @@ namespace ts {
 
         function checkStrictModeLabeledStatement(node: LabeledStatement) {
             // Grammar checking for labeledStatement
-            if (inStrictMode && options.target! >= ScriptTarget.ES2015) {
+            if (inStrictMode && getEmitScriptTarget(options) >= ScriptTarget.ES2015) {
                 if (isDeclarationStatement(node.statement) || isVariableStatement(node.statement)) {
                     errorOnFirstToken(node.label, Diagnostics.A_label_is_not_allowed_here);
                 }
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index f5f458a560573..9b8cce1ccc148 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -1508,7 +1508,7 @@ namespace ts {
                 }
                 else if (isParameterPropertyDeclaration(declaration, declaration.parent)) {
                     // foo = this.bar is illegal in esnext+useDefineForClassFields when bar is a parameter property
-                    return !(compilerOptions.target === ScriptTarget.ESNext && useDefineForClassFields
+                    return !(getEmitScriptTarget(compilerOptions) === ScriptTarget.ESNext && useDefineForClassFields
                              && getContainingClass(declaration) === getContainingClass(usage)
                              && isUsedInFunctionOrInstanceProperty(usage, declaration));
                 }
@@ -1539,7 +1539,7 @@ namespace ts {
                 return true;
             }
             if (isUsedInFunctionOrInstanceProperty(usage, declaration)) {
-                if (compilerOptions.target === ScriptTarget.ESNext && useDefineForClassFields
+                if (getEmitScriptTarget(compilerOptions) === ScriptTarget.ESNext && useDefineForClassFields
                     && getContainingClass(declaration)
                     && (isPropertyDeclaration(declaration) || isParameterPropertyDeclaration(declaration, declaration.parent))) {
                     return !isPropertyImmediatelyReferencedWithinDeclaration(declaration, usage, /*stopAtAnyPropertyDeclaration*/ true);
@@ -1943,7 +1943,7 @@ namespace ts {
                     case SyntaxKind.ArrowFunction:
                         // when targeting ES6 or higher there is no 'arguments' in an arrow function
                         // for lower compile targets the resolved symbol is used to emit an error
-                        if (compilerOptions.target! >= ScriptTarget.ES2015) {
+                        if (getEmitScriptTarget(compilerOptions) >= ScriptTarget.ES2015) {
                             break;
                         }
                         // falls through
@@ -2121,7 +2121,7 @@ namespace ts {
 
             // Perform extra checks only if error reporting was requested
             if (nameNotFoundMessage) {
-                if (propertyWithInvalidInitializer && !(compilerOptions.target === ScriptTarget.ESNext && useDefineForClassFields)) {
+                if (propertyWithInvalidInitializer && !(getEmitScriptTarget(compilerOptions) === ScriptTarget.ESNext && useDefineForClassFields)) {
                     // We have a match, but the reference occurred within a property initializer and the identifier also binds
                     // to a local variable in the constructor where the code will be emitted. Note that this is actually allowed
                     // with ESNext+useDefineForClassFields because the scope semantics are different.
@@ -2762,7 +2762,7 @@ namespace ts {
             if (!isIdentifier(name)) {
                 return undefined;
             }
-            const suppressInteropError = name.escapedText === InternalSymbolName.Default && !!(compilerOptions.allowSyntheticDefaultImports || compilerOptions.esModuleInterop);
+            const suppressInteropError = name.escapedText === InternalSymbolName.Default && !!(compilerOptions.allowSyntheticDefaultImports || getESModuleInterop(compilerOptions));
             const targetSymbol = resolveESModuleSymbol(moduleSymbol, moduleSpecifier, /*dontResolveAlias*/ false, suppressInteropError);
             if (targetSymbol) {
                 if (name.escapedText) {
@@ -2851,18 +2851,18 @@ namespace ts {
 
         function reportInvalidImportEqualsExportMember(node: ImportDeclaration | ExportDeclaration | VariableDeclaration, name: Identifier, declarationName: string, moduleName: string) {
             if (moduleKind >= ModuleKind.ES2015) {
-                const message = compilerOptions.esModuleInterop ? Diagnostics._0_can_only_be_imported_by_using_a_default_import :
+                const message = getESModuleInterop(compilerOptions) ? Diagnostics._0_can_only_be_imported_by_using_a_default_import :
                     Diagnostics._0_can_only_be_imported_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import;
                 error(name, message, declarationName);
             }
             else {
                 if (isInJSFile(node)) {
-                    const message = compilerOptions.esModuleInterop ? Diagnostics._0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import :
+                    const message = getESModuleInterop(compilerOptions) ? Diagnostics._0_can_only_be_imported_by_using_a_require_call_or_by_using_a_default_import :
                         Diagnostics._0_can_only_be_imported_by_using_a_require_call_or_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import;
                     error(name, message, declarationName);
                 }
                 else {
-                    const message = compilerOptions.esModuleInterop ? Diagnostics._0_can_only_be_imported_by_using_import_1_require_2_or_a_default_import :
+                    const message = getESModuleInterop(compilerOptions) ? Diagnostics._0_can_only_be_imported_by_using_import_1_require_2_or_a_default_import :
                         Diagnostics._0_can_only_be_imported_by_using_import_1_require_2_or_by_turning_on_the_esModuleInterop_flag_and_using_a_default_import;
                     error(name, message, declarationName, declarationName, moduleName);
                 }
@@ -3324,6 +3324,12 @@ namespace ts {
                     if (resolvedModule.isExternalLibraryImport && !resolutionExtensionIsTSOrJson(resolvedModule.extension)) {
                         errorOnImplicitAnyModule(/*isError*/ false, errorNode, resolvedModule, moduleReference);
                     }
+                    if (getEmitModuleResolutionKind(compilerOptions) === ModuleResolutionKind.Node12 || getEmitModuleResolutionKind(compilerOptions) === ModuleResolutionKind.NodeNext) {
+                        const isSyncImport = (currentSourceFile.impliedNodeFormat === ModuleKind.CommonJS && !findAncestor(location, isImportCall)) || !!findAncestor(location, isImportEqualsDeclaration);
+                        if (isSyncImport && sourceFile.impliedNodeFormat === ModuleKind.ESNext) {
+                            error(errorNode, Diagnostics.Module_0_cannot_be_imported_using_this_construct_The_specifier_only_resolves_to_an_es_module_which_cannot_be_imported_synchronously_Use_dynamic_import_instead, moduleReference);
+                        }
+                    }
                     // merged symbol is module declaration symbol combined with all augmentations
                     return getMergedSymbol(sourceFile.symbol);
                 }
@@ -3385,7 +3391,6 @@ namespace ts {
                          * Direct users to import source with .js extension if outputting an ES module.
                          * @see https://github.com/microsoft/TypeScript/issues/42151
                          */
-                        const moduleKind = getEmitModuleKind(compilerOptions);
                         if (moduleKind >= ModuleKind.ES2015) {
                             replacedImportSource += ".js";
                         }
@@ -3393,7 +3398,7 @@ namespace ts {
                     }
                     else if (!compilerOptions.resolveJsonModule &&
                         fileExtensionIs(moduleReference, Extension.Json) &&
-                        getEmitModuleResolutionKind(compilerOptions) === ModuleResolutionKind.NodeJs &&
+                        getEmitModuleResolutionKind(compilerOptions) !== ModuleResolutionKind.Classic &&
                         hasJsonModuleEmitEnabled(compilerOptions)) {
                         error(errorNode, Diagnostics.Cannot_find_module_0_Consider_using_resolveJsonModule_to_import_module_with_json_extension, moduleReference);
                     }
@@ -3477,7 +3482,7 @@ namespace ts {
                     return symbol;
                 }
 
-                if (compilerOptions.esModuleInterop) {
+                if (getESModuleInterop(compilerOptions)) {
                     const referenceParent = referencingLocation.parent;
                     if (
                         (isImportDeclaration(referenceParent) && getNamespaceDeclarationNode(referenceParent)) ||
@@ -5771,7 +5776,7 @@ namespace ts {
                     const nonRootParts = chain.length > 1 ? createAccessFromSymbolChain(chain, chain.length - 1, 1) : undefined;
                     const typeParameterNodes = overrideTypeArguments || lookupTypeParameterNodes(chain, 0, context);
                     const specifier = getSpecifierForModuleSymbol(chain[0], context);
-                    if (!(context.flags & NodeBuilderFlags.AllowNodeModulesRelativePaths) && getEmitModuleResolutionKind(compilerOptions) === ModuleResolutionKind.NodeJs && specifier.indexOf("/node_modules/") >= 0) {
+                    if (!(context.flags & NodeBuilderFlags.AllowNodeModulesRelativePaths) && getEmitModuleResolutionKind(compilerOptions) !== ModuleResolutionKind.Classic && specifier.indexOf("/node_modules/") >= 0) {
                         // If ultimately we can only name the symbol with a reference that dives into a `node_modules` folder, we should error
                         // since declaration files with these kinds of references are liable to fail when published :(
                         context.encounteredError = true;
@@ -6020,7 +6025,7 @@ namespace ts {
                 if (nameType) {
                     if (nameType.flags & TypeFlags.StringOrNumberLiteral) {
                         const name = "" + (nameType as StringLiteralType | NumberLiteralType).value;
-                        if (!isIdentifierText(name, compilerOptions.target) && !isNumericLiteralName(name)) {
+                        if (!isIdentifierText(name, getEmitScriptTarget(compilerOptions)) && !isNumericLiteralName(name)) {
                             return factory.createStringLiteral(name, !!singleQuote);
                         }
                         if (isNumericLiteralName(name) && startsWith(name, "-")) {
@@ -6035,7 +6040,7 @@ namespace ts {
             }
 
             function createPropertyNameNodeForIdentifierOrLiteral(name: string, stringNamed?: boolean, singleQuote?: boolean) {
-                return isIdentifierText(name, compilerOptions.target) ? factory.createIdentifier(name) :
+                return isIdentifierText(name, getEmitScriptTarget(compilerOptions)) ? factory.createIdentifier(name) :
                     !stringNamed && isNumericLiteralName(name) && +name >= 0 ? factory.createNumericLiteral(+name) :
                     factory.createStringLiteral(name, !!singleQuote);
             }
@@ -7148,7 +7153,7 @@ namespace ts {
                         return;
                     }
                     let verbatimTargetName = unescapeLeadingUnderscores(target.escapedName);
-                    if (verbatimTargetName === InternalSymbolName.ExportEquals && (compilerOptions.esModuleInterop || compilerOptions.allowSyntheticDefaultImports)) {
+                    if (verbatimTargetName === InternalSymbolName.ExportEquals && (getESModuleInterop(compilerOptions) || compilerOptions.allowSyntheticDefaultImports)) {
                         // target refers to an `export=` symbol that was hoisted into a synthetic default - rename here to match
                         verbatimTargetName = InternalSymbolName.Default;
                     }
@@ -7833,7 +7838,7 @@ namespace ts {
             if (nameType) {
                 if (nameType.flags & TypeFlags.StringOrNumberLiteral) {
                     const name = "" + (nameType as StringLiteralType | NumberLiteralType).value;
-                    if (!isIdentifierText(name, compilerOptions.target) && !isNumericLiteralName(name)) {
+                    if (!isIdentifierText(name, getEmitScriptTarget(compilerOptions)) && !isNumericLiteralName(name)) {
                         return `"${escapeString(name, CharacterCodes.doubleQuote)}"`;
                     }
                     if (isNumericLiteralName(name) && startsWith(name, "-")) {
@@ -17522,7 +17527,7 @@ namespace ts {
                                 path = `${str}`;
                             }
                             // Otherwise write a dotted name if possible
-                            else if (isIdentifierText(str, compilerOptions.target)) {
+                            else if (isIdentifierText(str, getEmitScriptTarget(compilerOptions))) {
                                 path = `${path}.${str}`;
                             }
                             // Failing that, check if the name is already a computed name
@@ -27514,7 +27519,7 @@ namespace ts {
                     grammarErrorOnNode(right, Diagnostics.Cannot_assign_to_private_method_0_Private_methods_are_not_writable, idText(right));
                 }
 
-                if (lexicallyScopedSymbol?.valueDeclaration && (compilerOptions.target === ScriptTarget.ESNext && !useDefineForClassFields)) {
+                if (lexicallyScopedSymbol?.valueDeclaration && (getEmitScriptTarget(compilerOptions) === ScriptTarget.ESNext && !useDefineForClassFields)) {
                     const lexicalClass = getContainingClass(lexicallyScopedSymbol.valueDeclaration);
                     const parentStaticFieldInitializer = findAncestor(node, (n) => {
                         if (n === lexicalClass) return "quit";
@@ -30457,7 +30462,14 @@ namespace ts {
 
         function checkImportMetaProperty(node: MetaProperty) {
             if (moduleKind !== ModuleKind.ES2020 && moduleKind !== ModuleKind.ESNext && moduleKind !== ModuleKind.System) {
-                error(node, Diagnostics.The_import_meta_meta_property_is_only_allowed_when_the_module_option_is_es2020_esnext_or_system);
+                if (moduleKind === ModuleKind.Node12 || moduleKind === ModuleKind.NodeNext) {
+                    if (getSourceFileOfNode(node).impliedNodeFormat !== ModuleKind.ESNext) {
+                        error(node, Diagnostics.The_import_meta_meta_property_is_not_allowed_in_files_which_will_build_into_CommonJS_output);
+                    }
+                }
+                else {
+                    error(node, Diagnostics.The_import_meta_meta_property_is_only_allowed_when_the_module_option_is_es2020_esnext_system_node12_or_nodenext);
+                }
             }
             const file = getSourceFileOfNode(node);
             Debug.assert(!!(file.flags & NodeFlags.PossiblyContainsImportMeta), "Containing file is missing import meta node flag.");
@@ -31466,10 +31478,10 @@ namespace ts {
                                     Diagnostics.await_expressions_are_only_allowed_at_the_top_level_of_a_file_when_that_file_is_a_module_but_this_file_has_no_imports_or_exports_Consider_adding_an_empty_export_to_make_this_file_a_module);
                                 diagnostics.add(diagnostic);
                             }
-                            if ((moduleKind !== ModuleKind.ESNext && moduleKind !== ModuleKind.System) || languageVersion < ScriptTarget.ES2017) {
+                            if ((moduleKind !== ModuleKind.ESNext && moduleKind !== ModuleKind.System && !(moduleKind === ModuleKind.NodeNext && getSourceFileOfNode(node).impliedNodeFormat === ModuleKind.ESNext)) || languageVersion < ScriptTarget.ES2017) {
                                 span = getSpanOfTokenAtPosition(sourceFile, node.pos);
                                 const diagnostic = createFileDiagnostic(sourceFile, span.start, span.length,
-                                    Diagnostics.Top_level_await_expressions_are_only_allowed_when_the_module_option_is_set_to_esnext_or_system_and_the_target_option_is_set_to_es2017_or_higher);
+                                    Diagnostics.Top_level_await_expressions_are_only_allowed_when_the_module_option_is_set_to_esnext_system_or_nodenext_and_the_target_option_is_set_to_es2017_or_higher);
                                 diagnostics.add(diagnostic);
                             }
                         }
@@ -33699,7 +33711,7 @@ namespace ts {
                     // - The constructor declares parameter properties
                     //   or the containing class declares instance member variables with initializers.
                     const superCallShouldBeFirst =
-                        (compilerOptions.target !== ScriptTarget.ESNext || !useDefineForClassFields) &&
+                        (getEmitScriptTarget(compilerOptions) !== ScriptTarget.ESNext || !useDefineForClassFields) &&
                         (some((node.parent as ClassDeclaration).members, isInstancePropertyWithInitializerOrPrivateIdentifierProperty) ||
                          some(node.parameters, p => hasSyntacticModifier(p, ModifierFlags.ParameterPropertyModifier)));
 
@@ -35563,7 +35575,7 @@ namespace ts {
 
         function checkCollisionWithRequireExportsInGeneratedCode(node: Node, name: Identifier | undefined) {
             // No need to check for require or exports for ES6 modules and later
-            if (moduleKind >= ModuleKind.ES2015) {
+            if (moduleKind >= ModuleKind.ES2015 && !(moduleKind >= ModuleKind.Node12 && getSourceFileOfNode(node).impliedNodeFormat === ModuleKind.CommonJS)) {
                 return;
             }
 
@@ -37301,8 +37313,8 @@ namespace ts {
          * The name cannot be used as 'Object' of user defined types with special target.
          */
         function checkClassNameCollisionWithObject(name: Identifier): void {
-            if (languageVersion === ScriptTarget.ES5 && name.escapedText === "Object"
-                && moduleKind < ModuleKind.ES2015) {
+            if (languageVersion >= ScriptTarget.ES5 && name.escapedText === "Object"
+                && (moduleKind < ModuleKind.ES2015 || getSourceFileOfNode(name).impliedNodeFormat === ModuleKind.CommonJS)) {
                 error(name, Diagnostics.Class_name_cannot_be_Object_when_targeting_ES5_with_module_0, ModuleKind[moduleKind]); // https://github.com/Microsoft/TypeScript/issues/17494
             }
         }
@@ -38508,8 +38520,8 @@ namespace ts {
             checkAliasSymbol(node);
             if (node.kind === SyntaxKind.ImportSpecifier &&
                 idText(node.propertyName || node.name) === "default" &&
-                compilerOptions.esModuleInterop &&
-                moduleKind !== ModuleKind.System && moduleKind < ModuleKind.ES2015) {
+                getESModuleInterop(compilerOptions) &&
+                moduleKind !== ModuleKind.System && (moduleKind < ModuleKind.ES2015 || getSourceFileOfNode(node).impliedNodeFormat === ModuleKind.CommonJS)) {
                 checkExternalEmitHelpers(node, ExternalEmitHelpers.ImportDefault);
             }
         }
@@ -38531,7 +38543,7 @@ namespace ts {
                     if (importClause.namedBindings) {
                         if (importClause.namedBindings.kind === SyntaxKind.NamespaceImport) {
                             checkImportBinding(importClause.namedBindings);
-                            if (moduleKind !== ModuleKind.System && moduleKind < ModuleKind.ES2015 && compilerOptions.esModuleInterop) {
+                            if (moduleKind !== ModuleKind.System && (moduleKind < ModuleKind.ES2015 || getSourceFileOfNode(node).impliedNodeFormat === ModuleKind.CommonJS) && getESModuleInterop(compilerOptions)) {
                                 // import * as ns from "foo";
                                 checkExternalEmitHelpers(node, ExternalEmitHelpers.ImportStar);
                             }
@@ -38579,7 +38591,7 @@ namespace ts {
                     }
                 }
                 else {
-                    if (moduleKind >= ModuleKind.ES2015 && !node.isTypeOnly && !(node.flags & NodeFlags.Ambient)) {
+                    if (moduleKind >= ModuleKind.ES2015 && getSourceFileOfNode(node).impliedNodeFormat === undefined && !node.isTypeOnly && !(node.flags & NodeFlags.Ambient)) {
                         // Import equals declaration is deprecated in es6 or above
                         grammarErrorOnNode(node, Diagnostics.Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead);
                     }
@@ -38624,12 +38636,12 @@ namespace ts {
                     else if (node.exportClause) {
                         checkAliasSymbol(node.exportClause);
                     }
-                    if (moduleKind !== ModuleKind.System && moduleKind < ModuleKind.ES2015) {
+                    if (moduleKind !== ModuleKind.System && (moduleKind < ModuleKind.ES2015 || getSourceFileOfNode(node).impliedNodeFormat === ModuleKind.CommonJS)) {
                         if (node.exportClause) {
                             // export * as ns from "foo";
                             // For ES2015 modules, we emit it as a pair of `import * as a_1 ...; export { a_1 as ns }` and don't need the helper.
                             // We only use the helper here when in esModuleInterop
-                            if (compilerOptions.esModuleInterop) {
+                            if (getESModuleInterop(compilerOptions)) {
                                 checkExternalEmitHelpers(node, ExternalEmitHelpers.ImportStar);
                             }
                         }
@@ -38720,9 +38732,9 @@ namespace ts {
                 }
             }
             else {
-                if (compilerOptions.esModuleInterop &&
+                if (getESModuleInterop(compilerOptions) &&
                     moduleKind !== ModuleKind.System &&
-                    moduleKind < ModuleKind.ES2015 &&
+                    (moduleKind < ModuleKind.ES2015 || getSourceFileOfNode(node).impliedNodeFormat === ModuleKind.CommonJS) &&
                     idText(node.propertyName || node.name) === "default") {
                     checkExternalEmitHelpers(node, ExternalEmitHelpers.ImportDefault);
                 }
@@ -38785,7 +38797,7 @@ namespace ts {
             }
 
             if (node.isExportEquals && !(node.flags & NodeFlags.Ambient)) {
-                if (moduleKind >= ModuleKind.ES2015) {
+                if (moduleKind >= ModuleKind.ES2015 && getSourceFileOfNode(node).impliedNodeFormat !== ModuleKind.CommonJS) {
                     // export assignment is not supported in es6 modules
                     grammarErrorOnNode(node, Diagnostics.Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead);
                 }
@@ -41883,9 +41895,9 @@ namespace ts {
                                 diagnostics.add(createDiagnosticForNode(forInOrOfStatement.awaitModifier,
                                     Diagnostics.for_await_loops_are_only_allowed_at_the_top_level_of_a_file_when_that_file_is_a_module_but_this_file_has_no_imports_or_exports_Consider_adding_an_empty_export_to_make_this_file_a_module));
                             }
-                            if ((moduleKind !== ModuleKind.ESNext && moduleKind !== ModuleKind.System) || languageVersion < ScriptTarget.ES2017) {
+                            if ((moduleKind !== ModuleKind.ESNext && moduleKind !== ModuleKind.System && !(moduleKind === ModuleKind.NodeNext && getSourceFileOfNode(forInOrOfStatement).impliedNodeFormat === ModuleKind.ESNext)) || languageVersion < ScriptTarget.ES2017) {
                                 diagnostics.add(createDiagnosticForNode(forInOrOfStatement.awaitModifier,
-                                    Diagnostics.Top_level_for_await_loops_are_only_allowed_when_the_module_option_is_set_to_esnext_or_system_and_the_target_option_is_set_to_es2017_or_higher));
+                                    Diagnostics.Top_level_for_await_loops_are_only_allowed_when_the_module_option_is_set_to_esnext_system_or_nodenext_and_the_target_option_is_set_to_es2017_or_higher));
                             }
                         }
                     }
@@ -42264,8 +42276,7 @@ namespace ts {
                 return grammarErrorOnNode(node.exclamationToken, message);
             }
 
-            const moduleKind = getEmitModuleKind(compilerOptions);
-            if (moduleKind < ModuleKind.ES2015 && moduleKind !== ModuleKind.System &&
+            if ((moduleKind < ModuleKind.ES2015 || getSourceFileOfNode(node).impliedNodeFormat === ModuleKind.CommonJS) && moduleKind !== ModuleKind.System &&
                 !(node.parent.parent.flags & NodeFlags.Ambient) && hasSyntacticModifier(node.parent.parent, ModifierFlags.Export)) {
                 checkESModuleMarker(node.name);
             }
@@ -42635,7 +42646,7 @@ namespace ts {
 
         function checkGrammarImportCallExpression(node: ImportCall): boolean {
             if (moduleKind === ModuleKind.ES2015) {
-                return grammarErrorOnNode(node, Diagnostics.Dynamic_imports_are_only_supported_when_the_module_flag_is_set_to_es2020_esnext_commonjs_amd_system_or_umd);
+                return grammarErrorOnNode(node, Diagnostics.Dynamic_imports_are_only_supported_when_the_module_flag_is_set_to_es2020_esnext_commonjs_amd_system_umd_node12_or_nodenext);
             }
 
             if (node.typeArguments) {
diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 09107e83df8f8..49a0b71fdbe99 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -393,7 +393,9 @@ namespace ts {
                 es6: ModuleKind.ES2015,
                 es2015: ModuleKind.ES2015,
                 es2020: ModuleKind.ES2020,
-                esnext: ModuleKind.ESNext
+                esnext: ModuleKind.ESNext,
+                node12: ModuleKind.Node12,
+                nodenext: ModuleKind.NodeNext,
             })),
             affectsModuleResolution: true,
             affectsEmit: true,
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index b71edb82c4bd0..a199dab5bb579 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -944,7 +944,7 @@
         "category": "Error",
         "code": 1322
     },
-    "Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.": {
+    "Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.": {
         "category": "Error",
         "code": 1323
     },
@@ -1016,7 +1016,7 @@
         "category": "Error",
         "code": 1342
     },
-    "The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.": {
+    "The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.": {
         "category": "Error",
         "code": 1343
     },
@@ -1144,7 +1144,7 @@
         "category": "Message",
         "code": 1377
     },
-    "Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.": {
+    "Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.": {
         "category": "Error",
         "code": 1378
     },
@@ -1360,7 +1360,7 @@
         "category": "Error",
         "code": 1431
     },
-    "Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.": {
+    "Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.": {
         "category": "Error",
         "code": 1432
     },
@@ -1368,6 +1368,14 @@
         "category": "Error",
         "code": 1433
     },
+    "The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.": {
+        "category": "Error",
+        "code": 1434
+    },
+    "Module '{0}' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.": {
+        "category": "Error",
+        "code": 1435
+    },
 
     "The types of '{0}' are incompatible between these types.": {
         "category": "Error",
diff --git a/src/compiler/factory/emitHelpers.ts b/src/compiler/factory/emitHelpers.ts
index a6ef294c76d4b..b205818d4e883 100644
--- a/src/compiler/factory/emitHelpers.ts
+++ b/src/compiler/factory/emitHelpers.ts
@@ -136,7 +136,7 @@ namespace ts {
         // ES2018 Helpers
 
         function createAssignHelper(attributesSegments: Expression[]) {
-            if (context.getCompilerOptions().target! >= ScriptTarget.ES2015) {
+            if (getEmitScriptTarget(context.getCompilerOptions()) >= ScriptTarget.ES2015) {
                 return factory.createCallExpression(factory.createPropertyAccessExpression(factory.createIdentifier("Object"), "assign"),
                                   /*typeArguments*/ undefined,
                                   attributesSegments);
diff --git a/src/compiler/factory/nodeFactory.ts b/src/compiler/factory/nodeFactory.ts
index 2c2fde823ac16..a88411baad91c 100644
--- a/src/compiler/factory/nodeFactory.ts
+++ b/src/compiler/factory/nodeFactory.ts
@@ -5112,6 +5112,7 @@ namespace ts {
             node.transformFlags =
                 propagateChildrenFlags(node.statements) |
                 propagateChildFlags(node.endOfFileToken);
+            node.impliedNodeFormat = source.impliedNodeFormat;
             return node;
         }
 
diff --git a/src/compiler/factory/utilities.ts b/src/compiler/factory/utilities.ts
index 6d40ae277bd4e..8b8aa481c9877 100644
--- a/src/compiler/factory/utilities.ts
+++ b/src/compiler/factory/utilities.ts
@@ -466,7 +466,7 @@ namespace ts {
         if (compilerOptions.importHelpers && isEffectiveExternalModule(sourceFile, compilerOptions)) {
             let namedBindings: NamedImportBindings | undefined;
             const moduleKind = getEmitModuleKind(compilerOptions);
-            if (moduleKind >= ModuleKind.ES2015 && moduleKind <= ModuleKind.ESNext) {
+            if ((moduleKind >= ModuleKind.ES2015 && moduleKind <= ModuleKind.ESNext) || sourceFile.impliedNodeFormat === ModuleKind.ESNext) {
                 // use named imports
                 const helpers = getEmitHelpers(sourceFile);
                 if (helpers) {
@@ -523,9 +523,9 @@ namespace ts {
             }
 
             const moduleKind = getEmitModuleKind(compilerOptions);
-            let create = (hasExportStarsToExportValues || (compilerOptions.esModuleInterop && hasImportStarOrImportDefault))
+            let create = (hasExportStarsToExportValues || (getESModuleInterop(compilerOptions) && hasImportStarOrImportDefault))
                 && moduleKind !== ModuleKind.System
-                && moduleKind < ModuleKind.ES2015;
+                && (moduleKind < ModuleKind.ES2015 || node.impliedNodeFormat === ModuleKind.CommonJS);
             if (!create) {
                 const helpers = getEmitHelpers(node);
                 if (helpers) {
diff --git a/src/compiler/moduleNameResolver.ts b/src/compiler/moduleNameResolver.ts
index 897aafa261113..ab5f754e9eeb3 100644
--- a/src/compiler/moduleNameResolver.ts
+++ b/src/compiler/moduleNameResolver.ts
@@ -113,6 +113,7 @@ namespace ts {
         typesVersions?: MapLike<MapLike<string[]>>;
         main?: string;
         tsconfig?: string;
+        type?: string;
     }
 
     interface PackageJson extends PackageJsonPathFields {
@@ -816,7 +817,20 @@ namespace ts {
         else {
             let moduleResolution = compilerOptions.moduleResolution;
             if (moduleResolution === undefined) {
-                moduleResolution = getEmitModuleKind(compilerOptions) === ModuleKind.CommonJS ? ModuleResolutionKind.NodeJs : ModuleResolutionKind.Classic;
+                switch (getEmitModuleKind(compilerOptions)) {
+                    case ModuleKind.CommonJS:
+                        moduleResolution = ModuleResolutionKind.NodeJs;
+                        break;
+                    case ModuleKind.Node12:
+                        moduleResolution = ModuleResolutionKind.Node12;
+                        break;
+                    case ModuleKind.NodeNext:
+                        moduleResolution = ModuleResolutionKind.NodeNext;
+                        break;
+                    default:
+                        moduleResolution = ModuleResolutionKind.Classic;
+                        break;
+                }
                 if (traceEnabled) {
                     trace(host, Diagnostics.Module_resolution_kind_is_not_specified_using_0, ModuleResolutionKind[moduleResolution]);
                 }
@@ -829,6 +843,8 @@ namespace ts {
 
             perfLogger.logStartResolveModule(moduleName /* , containingFile, ModuleResolutionKind[moduleResolution]*/);
             switch (moduleResolution) {
+                case ModuleResolutionKind.Node12:
+                case ModuleResolutionKind.NodeNext: // TODO: Implement node12/nodenext resolution rules
                 case ModuleResolutionKind.NodeJs:
                     result = nodeModuleNameResolver(moduleName, containingFile, compilerOptions, host, cache, redirectedReference);
                     break;
@@ -1310,7 +1326,8 @@ namespace ts {
         versionPaths: VersionPaths | undefined;
     }
 
-    function getPackageJsonInfo(packageDirectory: string, onlyRecordFailures: boolean, state: ModuleResolutionState): PackageJsonInfo | undefined {
+    /*@internal*/
+    export function getPackageJsonInfo(packageDirectory: string, onlyRecordFailures: boolean, state: ModuleResolutionState): PackageJsonInfo | undefined {
         const { host, traceEnabled } = state;
         const packageJsonPath = combinePaths(packageDirectory, "package.json");
         if (onlyRecordFailures) {
diff --git a/src/compiler/moduleSpecifiers.ts b/src/compiler/moduleSpecifiers.ts
index f246f44c013d4..de42460d54aeb 100644
--- a/src/compiler/moduleSpecifiers.ts
+++ b/src/compiler/moduleSpecifiers.ts
@@ -763,6 +763,14 @@ namespace ts.moduleSpecifiers {
             case Extension.Jsx:
             case Extension.Json:
                 return ext;
+            case Extension.Dmts:
+            case Extension.Mts:
+            case Extension.Mjs:
+                return Extension.Mjs;
+            case Extension.Dcts:
+            case Extension.Cts:
+            case Extension.Cjs:
+                return Extension.Cjs;
             default:
                 return undefined;
         }
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index 9775890c53075..d52b9bec5da7a 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -738,6 +738,55 @@ namespace ts {
             configFileParseResult.errors;
     }
 
+    /**
+     * A function for determining if a given file is esm or cjs format, assuming modern node module resolution rules, as configured by the
+     * `options` parameter.
+     *
+     * @param fileName The normalized absolute path to check the format of (it need not exist on disk)
+     * @param packageJsonInfoCache (Optional) A cache for package file lookups - it's best to have a cache when this function is called often
+     * @param host The ModuleResolutionHost which can perform the filesystem lookups for package json data
+     * @param options The compiler options to perform the analysis under - relevant options are `moduleResolution` and `traceResolution`
+     * @returns `undefined` if the path has no relevant implied format, `ModuleKind.ESNext` for esm format, and `ModuleKind.CommonJS` for cjs format
+     */
+    export function getImpliedNodeFormatForFile(fileName: Path, packageJsonInfoCache: PackageJsonInfoCache | undefined, host: ModuleResolutionHost, options: CompilerOptions): ModuleKind.ESNext | ModuleKind.CommonJS | undefined {
+        switch (getEmitModuleResolutionKind(options)) {
+            case ModuleResolutionKind.Node12:
+            case ModuleResolutionKind.NodeNext:
+                return fileExtensionIsOneOf(fileName, [Extension.Dmts, Extension.Mts, Extension.Mjs]) ? ModuleKind.ESNext :
+                    fileExtensionIsOneOf(fileName, [Extension.Dcts, Extension.Cts, Extension.Cjs]) ? ModuleKind.CommonJS :
+                    fileExtensionIsOneOf(fileName, [Extension.Dts, Extension.Ts, Extension.Tsx, Extension.Js, Extension.Jsx]) ? lookupFromPackageJson() :
+                    undefined; // other extensions, like `json` or `tsbuildinfo`, are set as `undefined` here but they should never be fed through the transformer pipeline
+            default:
+                return undefined;
+        }
+        function lookupFromPackageJson(): ModuleKind.ESNext | ModuleKind.CommonJS {
+            const state: {
+                host: ModuleResolutionHost;
+                compilerOptions: CompilerOptions;
+                traceEnabled: boolean;
+                failedLookupLocations: Push<string>;
+                resultFromCache?: ResolvedModuleWithFailedLookupLocations;
+                packageJsonInfoCache: PackageJsonInfoCache | undefined;
+            } = {
+                host,
+                compilerOptions: options,
+                traceEnabled: isTraceEnabled(options, host),
+                failedLookupLocations: [],
+                packageJsonInfoCache
+            };
+            const parts = getPathComponents(fileName);
+            parts.pop();
+            while (parts.length > 0) {
+                const pkg = getPackageJsonInfo(getPathFromPathComponents(parts), /*onlyRecordFailures*/ false, state);
+                if (pkg) {
+                    return pkg.packageJsonContent?.type === "module" ? ModuleKind.ESNext : ModuleKind.CommonJS;
+                }
+                parts.pop();
+            }
+            return ModuleKind.CommonJS;
+        }
+    }
+
     /**
      * Determine if source file needs to be re-created even if its text hasn't changed
      */
@@ -1453,8 +1502,8 @@ namespace ts {
 
             for (const oldSourceFile of oldSourceFiles) {
                 let newSourceFile = host.getSourceFileByPath
-                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.resolvedPath, options.target!, /*onError*/ undefined, shouldCreateNewSourceFile)
-                    : host.getSourceFile(oldSourceFile.fileName, options.target!, /*onError*/ undefined, shouldCreateNewSourceFile); // TODO: GH#18217
+                    ? host.getSourceFileByPath(oldSourceFile.fileName, oldSourceFile.resolvedPath, getEmitScriptTarget(options), /*onError*/ undefined, shouldCreateNewSourceFile)
+                    : host.getSourceFile(oldSourceFile.fileName, getEmitScriptTarget(options), /*onError*/ undefined, shouldCreateNewSourceFile); // TODO: GH#18217
 
                 if (!newSourceFile) {
                     return StructureIsReused.Not;
@@ -2609,7 +2658,7 @@ namespace ts {
             // We haven't looked for this file, do so now and cache result
             const file = host.getSourceFile(
                 fileName,
-                options.target!,
+                getEmitScriptTarget(options),
                 hostErrorMessage => addFilePreprocessingFileExplainingDiagnostic(/*file*/ undefined, reason, Diagnostics.Cannot_read_file_0_Colon_1, [fileName, hostErrorMessage]),
                 shouldCreateNewSourceFile
             );
@@ -2642,6 +2691,10 @@ namespace ts {
                 file.path = path;
                 file.resolvedPath = toPath(fileName);
                 file.originalFileName = originalFileName;
+                // It's a _little odd_ that we can't set `impliedNodeFormat` until the program step - but it's the first and only time we have a resolution cache
+                // and a freshly made source file node on hand at the same time, and we need both to set the field. Persisting the resolution cache all the way
+                // to the check and emit steps would be bad - so we much prefer detecting and storing the format information on the source file node upfront.
+                file.impliedNodeFormat = getImpliedNodeFormatForFile(file.resolvedPath, moduleResolutionCache?.getPackageJsonInfoCache(), host, options);
                 addFileIncludeReason(file, reason);
 
                 if (host.useCaseSensitiveFileNames()) {
@@ -3176,7 +3229,7 @@ namespace ts {
                 createDiagnosticForOptionName(Diagnostics.Option_0_cannot_be_specified_with_option_1, "noImplicitUseStrict", "alwaysStrict");
             }
 
-            const languageVersion = options.target || ScriptTarget.ES3;
+            const languageVersion = getEmitScriptTarget(options);
 
             const firstNonAmbientExternalModuleSourceFile = find(files, f => isExternalModule(f) && !f.isDeclarationFile);
             if (options.isolatedModules) {
@@ -3461,7 +3514,7 @@ namespace ts {
                         message = Diagnostics.File_is_library_specified_here;
                         break;
                     }
-                    const target = forEachEntry(targetOptionDeclaration.type, (value, key) => value === options.target ? key : undefined);
+                    const target = forEachEntry(targetOptionDeclaration.type, (value, key) => value === getEmitScriptTarget(options) ? key : undefined);
                     configFileNode = target ? getOptionsSyntaxByValue("target", target) : undefined;
                     message = Diagnostics.File_is_default_library_for_target_specified_here;
                     break;
diff --git a/src/compiler/transformer.ts b/src/compiler/transformer.ts
index 732205c00a34b..4c4b07d23a43a 100644
--- a/src/compiler/transformer.ts
+++ b/src/compiler/transformer.ts
@@ -8,6 +8,9 @@ namespace ts {
                 return transformECMAScriptModule;
             case ModuleKind.System:
                 return transformSystemModule;
+            case ModuleKind.Node12:
+            case ModuleKind.NodeNext:
+                return transformNodeModule;
             default:
                 return transformModule;
         }
diff --git a/src/compiler/transformers/classFields.ts b/src/compiler/transformers/classFields.ts
index 935c549dbcea5..de979f8a0ffa9 100644
--- a/src/compiler/transformers/classFields.ts
+++ b/src/compiler/transformers/classFields.ts
@@ -172,7 +172,7 @@ namespace ts {
         function transformSourceFile(node: SourceFile) {
             const options = context.getCompilerOptions();
             if (node.isDeclarationFile
-                || useDefineForClassFields && options.target === ScriptTarget.ESNext) {
+                || useDefineForClassFields && getEmitScriptTarget(options) === ScriptTarget.ESNext) {
                 return node;
             }
             const visited = visitEachChild(node, visitor, context);
diff --git a/src/compiler/transformers/jsx.ts b/src/compiler/transformers/jsx.ts
index 55c606f883218..7cc7c53550330 100644
--- a/src/compiler/transformers/jsx.ts
+++ b/src/compiler/transformers/jsx.ts
@@ -292,7 +292,7 @@ namespace ts {
                 // When there are no attributes, React wants "null"
             }
             else {
-                const target = compilerOptions.target;
+                const target = getEmitScriptTarget(compilerOptions);
                 if (target && target >= ScriptTarget.ES2018) {
                     objectProperties = factory.createObjectLiteralExpression(
                         flatten<SpreadAssignment | PropertyAssignment>(
diff --git a/src/compiler/transformers/module/esnextAnd2015.ts b/src/compiler/transformers/module/esnextAnd2015.ts
index 4a7e297722e86..a4e75b84c8b7f 100644
--- a/src/compiler/transformers/module/esnextAnd2015.ts
+++ b/src/compiler/transformers/module/esnextAnd2015.ts
@@ -5,7 +5,10 @@ namespace ts {
             factory,
             getEmitHelperFactory: emitHelpers,
         } = context;
+        const host = context.getEmitHost();
+        const resolver = context.getEmitResolver();
         const compilerOptions = context.getCompilerOptions();
+        const languageVersion = getEmitScriptTarget(compilerOptions);
         const previousOnEmitNode = context.onEmitNode;
         const previousOnSubstituteNode = context.onSubstituteNode;
         context.onEmitNode = onEmitNode;
@@ -14,6 +17,8 @@ namespace ts {
         context.enableSubstitution(SyntaxKind.Identifier);
 
         let helperNameSubstitutions: ESMap<string, Identifier> | undefined;
+        let currentSourceFile: SourceFile | undefined;
+        let importRequireStatements: [ImportDeclaration, VariableStatement] | undefined;
         return chainBundle(context, transformSourceFile);
 
         function transformSourceFile(node: SourceFile) {
@@ -22,7 +27,16 @@ namespace ts {
             }
 
             if (isExternalModule(node) || compilerOptions.isolatedModules) {
-                const result = updateExternalModule(node);
+                currentSourceFile = node;
+                importRequireStatements = undefined;
+                let result = updateExternalModule(node);
+                currentSourceFile = undefined;
+                if (importRequireStatements) {
+                    result = factory.updateSourceFile(
+                        result,
+                        setTextRange(factory.createNodeArray(insertStatementsAfterCustomPrologue(result.statements.slice(), importRequireStatements)), result.statements),
+                    );
+                }
                 if (!isExternalModule(node) || some(result.statements, isExternalModuleIndicator)) {
                     return result;
                 }
@@ -55,8 +69,10 @@ namespace ts {
         function visitor(node: Node): VisitResult<Node> {
             switch (node.kind) {
                 case SyntaxKind.ImportEqualsDeclaration:
-                    // Elide `import=` as it is not legal with --module ES6
-                    return undefined;
+                    // Though an error in es2020 modules, in node-flavor es2020 modules, we can helpfully transform this to a synthetic `require` call
+                    // To give easy access to a synchronous `require` in node-flavor esm. We do the transform even in scenarios where we error, but `import.meta.url`
+                    // is available, just because the output is reasonable for a node-like runtime.
+                    return getEmitScriptTarget(compilerOptions) >= ModuleKind.ES2020 ? visitImportEqualsDeclaration(node as ImportEqualsDeclaration) : undefined;
                 case SyntaxKind.ExportAssignment:
                     return visitExportAssignment(node as ExportAssignment);
                 case SyntaxKind.ExportDeclaration:
@@ -67,6 +83,106 @@ namespace ts {
             return node;
         }
 
+        /**
+         * Creates a `require()` call to import an external module.
+         *
+         * @param importNode The declararation to import.
+         */
+         function createRequireCall(importNode: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration) {
+            const moduleName = getExternalModuleNameLiteral(factory, importNode, Debug.checkDefined(currentSourceFile), host, resolver, compilerOptions);
+            const args: Expression[] = [];
+            if (moduleName) {
+                args.push(moduleName);
+            }
+
+            if (!importRequireStatements) {
+                const createRequireName = factory.createUniqueName("_createRequire", GeneratedIdentifierFlags.Optimistic | GeneratedIdentifierFlags.FileLevel);
+                const importStatement = factory.createImportDeclaration(
+                    /*decorators*/ undefined,
+                    /*modifiers*/ undefined,
+                    factory.createImportClause(
+                        /*isTypeOnly*/ false,
+                        /*name*/ undefined,
+                        factory.createNamedImports([
+                            factory.createImportSpecifier(factory.createIdentifier("createRequire"), createRequireName)
+                        ])
+                    ),
+                    factory.createStringLiteral("module")
+                );
+                const requireHelperName = factory.createUniqueName("__require", GeneratedIdentifierFlags.Optimistic | GeneratedIdentifierFlags.FileLevel);
+                const requireStatement = factory.createVariableStatement(
+                    /*modifiers*/ undefined,
+                    factory.createVariableDeclarationList(
+                        [
+                            factory.createVariableDeclaration(
+                                requireHelperName,
+                                /*exclamationToken*/ undefined,
+                                /*type*/ undefined,
+                                factory.createCallExpression(factory.cloneNode(createRequireName), /*typeArguments*/ undefined, [
+                                    factory.createPropertyAccessExpression(factory.createMetaProperty(SyntaxKind.ImportKeyword, factory.createIdentifier("meta")), factory.createIdentifier("url"))
+                                ])
+                            )
+                        ],
+                        /*flags*/ languageVersion >= ScriptTarget.ES2015 ? NodeFlags.Const : NodeFlags.None
+                    )
+                );
+                importRequireStatements = [importStatement, requireStatement];
+
+            }
+
+            const name = importRequireStatements[1].declarationList.declarations[0].name;
+            Debug.assertNode(name, isIdentifier);
+            return factory.createCallExpression(factory.cloneNode(name), /*typeArguments*/ undefined, args);
+        }
+
+        /**
+         * Visits an ImportEqualsDeclaration node.
+         *
+         * @param node The node to visit.
+         */
+        function visitImportEqualsDeclaration(node: ImportEqualsDeclaration): VisitResult<Statement> {
+            Debug.assert(isExternalModuleImportEqualsDeclaration(node), "import= for internal module references should be handled in an earlier transformer.");
+
+            let statements: Statement[] | undefined;
+            statements = append(statements,
+                setOriginalNode(
+                    setTextRange(
+                        factory.createVariableStatement(
+                            /*modifiers*/ undefined,
+                            factory.createVariableDeclarationList(
+                                [
+                                    factory.createVariableDeclaration(
+                                        factory.cloneNode(node.name),
+                                        /*exclamationToken*/ undefined,
+                                        /*type*/ undefined,
+                                        createRequireCall(node)
+                                    )
+                                ],
+                                /*flags*/ languageVersion >= ScriptTarget.ES2015 ? NodeFlags.Const : NodeFlags.None
+                            )
+                        ),
+                        node),
+                    node
+                )
+            );
+
+            statements = appendExportsOfImportEqualsDeclaration(statements, node);
+
+            return singleOrMany(statements);
+        }
+
+        function appendExportsOfImportEqualsDeclaration(statements: Statement[] | undefined, node: ImportEqualsDeclaration) {
+            if (hasSyntacticModifier(node, ModifierFlags.Export)) {
+                statements = append(statements, factory.createExportDeclaration(
+                    /*decorators*/ undefined,
+                    /*modifiers*/ undefined,
+                    node.isTypeOnly,
+                    factory.createNamedExports([factory.createExportSpecifier(/*propertyName*/ undefined, idText(node.name))])
+                ));
+            }
+            return statements;
+        }
+
         function visitExportAssignment(node: ExportAssignment): VisitResult<ExportAssignment> {
             // Elide `export=` as it is not legal with --module ES6
             return node.isExportEquals ? undefined : node;
diff --git a/src/compiler/transformers/module/module.ts b/src/compiler/transformers/module/module.ts
index 2a7440bd893b8..dd06ca804f0f0 100644
--- a/src/compiler/transformers/module/module.ts
+++ b/src/compiler/transformers/module/module.ts
@@ -548,7 +548,7 @@ namespace ts {
                 return node;
             }
 
-            if (isImportCall(node)) {
+            if (isImportCall(node) && currentSourceFile.impliedNodeFormat === undefined) {
                 return visitImportCallExpression(node);
             }
             else if (isDestructuringAssignment(node)) {
@@ -717,7 +717,7 @@ namespace ts {
             }
 
             const promise = factory.createNewExpression(factory.createIdentifier("Promise"), /*typeArguments*/ undefined, [func]);
-            if (compilerOptions.esModuleInterop) {
+            if (getESModuleInterop(compilerOptions)) {
                 return factory.createCallExpression(factory.createPropertyAccessExpression(promise, factory.createIdentifier("then")), /*typeArguments*/ undefined, [emitHelpers().createImportStarCallbackHelper()]);
             }
             return promise;
@@ -731,7 +731,7 @@ namespace ts {
             // if we simply do require in resolve callback in Promise constructor. We will execute the loading immediately
             const promiseResolveCall = factory.createCallExpression(factory.createPropertyAccessExpression(factory.createIdentifier("Promise"), "resolve"), /*typeArguments*/ undefined, /*argumentsArray*/ []);
             let requireCall: Expression = factory.createCallExpression(factory.createIdentifier("require"), /*typeArguments*/ undefined, arg ? [arg] : []);
-            if (compilerOptions.esModuleInterop) {
+            if (getESModuleInterop(compilerOptions)) {
                 requireCall = emitHelpers().createImportStarHelper(requireCall);
             }
 
@@ -767,7 +767,7 @@ namespace ts {
         }
 
         function getHelperExpressionForExport(node: ExportDeclaration, innerExpr: Expression) {
-            if (!compilerOptions.esModuleInterop || getEmitFlags(node) & EmitFlags.NeverApplyImportHelper) {
+            if (!getESModuleInterop(compilerOptions) || getEmitFlags(node) & EmitFlags.NeverApplyImportHelper) {
                 return innerExpr;
             }
             if (getExportNeedsImportStarHelper(node)) {
@@ -777,7 +777,7 @@ namespace ts {
         }
 
         function getHelperExpressionForImport(node: ImportDeclaration, innerExpr: Expression) {
-            if (!compilerOptions.esModuleInterop || getEmitFlags(node) & EmitFlags.NeverApplyImportHelper) {
+            if (!getESModuleInterop(compilerOptions) || getEmitFlags(node) & EmitFlags.NeverApplyImportHelper) {
                 return innerExpr;
             }
             if (getImportNeedsImportStarHelper(node)) {
@@ -1037,7 +1037,7 @@ namespace ts {
                     }
                     else {
                         const exportNeedsImportDefault =
-                            !!compilerOptions.esModuleInterop &&
+                            !!getESModuleInterop(compilerOptions) &&
                             !(getEmitFlags(node) & EmitFlags.NeverApplyImportHelper) &&
                             idText(specifier.propertyName || specifier.name) === "default";
                         const exportedValue = factory.createPropertyAccessExpression(
diff --git a/src/compiler/transformers/module/node.ts b/src/compiler/transformers/module/node.ts
new file mode 100644
index 0000000000000..b1addf4f3ece2
--- /dev/null
+++ b/src/compiler/transformers/module/node.ts
@@ -0,0 +1,84 @@
+/*@internal*/
+namespace ts {
+    export function transformNodeModule(context: TransformationContext) {
+        const previousOnSubstituteNode = context.onSubstituteNode;
+        const previousOnEmitNode = context.onEmitNode;
+
+        const esmTransform = transformECMAScriptModule(context);
+
+        const esmOnSubstituteNode = context.onSubstituteNode;
+        const esmOnEmitNode = context.onEmitNode;
+
+        context.onSubstituteNode = previousOnSubstituteNode;
+        context.onEmitNode = previousOnEmitNode;
+
+        const cjsTransform = transformModule(context);
+
+        const cjsOnSubstituteNode = context.onSubstituteNode;
+        const cjsOnEmitNode = context.onEmitNode;
+
+        context.onSubstituteNode = onSubstituteNode;
+        context.onEmitNode = onEmitNode;
+        context.enableSubstitution(SyntaxKind.SourceFile);
+        context.enableEmitNotification(SyntaxKind.SourceFile);
+
+        let currentSourceFile: SourceFile | undefined;
+        return transformSourceFileOrBundle;
+
+        function onSubstituteNode(hint: EmitHint, node: Node) {
+            if (isSourceFile(node)) {
+                currentSourceFile = node;
+                // Neither component transform wants substitution notifications for `SourceFile`s, and, in fact, relies on
+                // the source file emit notification to setup scope variables for substitutions (so we _cannot_ call their substitute
+                // functions on source files safely, as that context only gets setup in a later pipeline phase!)
+                return previousOnSubstituteNode(hint, node);
+            }
+            else {
+                if (!currentSourceFile) {
+                    return previousOnSubstituteNode(hint, node);
+                }
+                if (currentSourceFile.impliedNodeFormat === ModuleKind.ESNext) {
+                    return esmOnSubstituteNode(hint, node);
+                }
+                return cjsOnSubstituteNode(hint, node);
+            }
+        }
+
+        function onEmitNode(hint: EmitHint, node: Node, emitCallback: (hint: EmitHint, node: Node) => void): void {
+            if (isSourceFile(node)) {
+                currentSourceFile = node;
+            }
+            if (!currentSourceFile) {
+                return previousOnEmitNode(hint, node, emitCallback);
+            }
+            if (currentSourceFile.impliedNodeFormat === ModuleKind.ESNext) {
+                return esmOnEmitNode(hint, node, emitCallback);
+            }
+            return cjsOnEmitNode(hint, node, emitCallback);
+        }
+
+        function getModuleTransformForFile(file: SourceFile): (typeof esmTransform) {
+            return file.impliedNodeFormat === ModuleKind.ESNext ? esmTransform : cjsTransform;
+        }
+
+        function transformSourceFile(node: SourceFile) {
+            if (node.isDeclarationFile) {
+                return node;
+            }
+
+            currentSourceFile = node;
+            const result = getModuleTransformForFile(node)(node);
+            currentSourceFile = undefined;
+            Debug.assert(isSourceFile(result));
+            return result;
+        }
+
+        function transformSourceFileOrBundle(node: SourceFile | Bundle) {
+            return node.kind === SyntaxKind.SourceFile ? transformSourceFile(node) : transformBundle(node);
+        }
+
+        function transformBundle(node: Bundle) {
+            return context.factory.createBundle(map(node.sourceFiles, transformSourceFile), node.prepends);
+        }
+    }
+}
diff --git a/src/compiler/tsconfig.json b/src/compiler/tsconfig.json
index 5f118cf1e47bd..c5db068d120c1 100644
--- a/src/compiler/tsconfig.json
+++ b/src/compiler/tsconfig.json
@@ -63,6 +63,7 @@
         "transformers/module/module.ts",
         "transformers/module/system.ts",
         "transformers/module/esnextAnd2015.ts",
+        "transformers/module/node.ts",
         "transformers/declarations/diagnostics.ts",
         "transformers/declarations.ts",
         "transformer.ts",
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 4d568677b2e20..e101c6614e183 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -3547,6 +3547,20 @@ namespace ts {
         hasNoDefaultLib: boolean;
 
         languageVersion: ScriptTarget;
+
+        /**
+         * When `module` is `Node12` or `NodeNext`, this field controls weather the
+         * source file in question is an ESNext-output-format file, or a CommonJS-output-format
+         * module. This is derived by the module resolver as it looks up the file, since
+         * it is derived from either the file extension of the module, or the containing
+         * `package.json` context, and affects both checking and emit.
+         *
+         * It is _public_ so that (pre)transformers can set this field,
+         * since it switches the builtin `node` module transform. Generally speaking, if unset,
+         * the field is treated as though it is `ModuleKind.CommonJS`.
+         */
+        impliedNodeFormat?: ModuleKind.ESNext | ModuleKind.CommonJS;
+
         /* @internal */ scriptKind: ScriptKind;
 
         /**
@@ -5914,7 +5928,13 @@ namespace ts {
 
     export enum ModuleResolutionKind {
         Classic  = 1,
-        NodeJs   = 2
+        NodeJs   = 2,
+        // Starting with node12, node's module resolver has significant departures from tranditional cjs resolution
+        // to better support ecmascript modules and their use within node - more features are still being added, so
+        // we can expect it co change over time, and as such, offer both a `NodeNext` moving resolution target, and a `Node12`
+        // version-anchored resolution target
+        Node12   = 3,
+        NodeNext = 99, // Not simply `Node12` so that compiled code linked against TS can use the `Next` value reliably (same as with `ModuleKind`)
     }
 
     export interface PluginImport {
@@ -6067,7 +6087,7 @@ namespace ts {
         suppressExcessPropertyErrors?: boolean;
         suppressImplicitAnyIndexErrors?: boolean;
         /* @internal */ suppressOutputPathCheck?: boolean;
-        target?: ScriptTarget; // TODO: GH#18217 frequently asserted as defined
+        target?: ScriptTarget;
         traceResolution?: boolean;
         useUnknownInCatchVariables?: boolean;
         resolveJsonModule?: boolean;
@@ -6119,7 +6139,11 @@ namespace ts {
         //       module kind).
         ES2015 = 5,
         ES2020 = 6,
-        ESNext = 99
+        ESNext = 99,
+
+        // Node12+ is an amalgam of commonjs (albeit updated) and es2020+, and represents a distinct module system from es2020/esnext
+        Node12 = 100,
+        NodeNext = 199,
     }
 
     export const enum JsxEmit {
@@ -6514,7 +6538,13 @@ namespace ts {
         Js = ".js",
         Jsx = ".jsx",
         Json = ".json",
-        TsBuildInfo = ".tsbuildinfo"
+        TsBuildInfo = ".tsbuildinfo",
+        Mjs = ".mjs",
+        Mts = ".mts",
+        Dmts = ".d.mts",
+        Cjs = ".cjs",
+        Cts = ".cts",
+        Dcts = ".d.cts",
     }
 
     export interface ResolvedModuleWithFailedLookupLocations {
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index ab8bc3edfcb4b..df03bfa8d743d 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -791,8 +791,12 @@ namespace ts {
         return symbol.declarations?.find(d => !isExternalModuleAugmentation(d) && !(isModuleDeclaration(d) && isGlobalScopeAugmentation(d)));
     }
 
+    function isCommonJSContainingModuleKind(kind: ModuleKind) {
+        return kind === ModuleKind.CommonJS || kind === ModuleKind.Node12 || kind === ModuleKind.NodeNext;
+    }
+
     export function isEffectiveExternalModule(node: SourceFile, compilerOptions: CompilerOptions) {
-        return isExternalModule(node) || compilerOptions.isolatedModules || ((getEmitModuleKind(compilerOptions) === ModuleKind.CommonJS) && !!node.commonJsModuleIndicator);
+        return isExternalModule(node) || compilerOptions.isolatedModules || (isCommonJSContainingModuleKind(getEmitModuleKind(compilerOptions)) && !!node.commonJsModuleIndicator);
     }
 
     /**
@@ -6070,8 +6074,11 @@ namespace ts {
         return scriptKind === ScriptKind.TSX || scriptKind === ScriptKind.JSX || scriptKind === ScriptKind.JS || scriptKind === ScriptKind.JSON ? LanguageVariant.JSX : LanguageVariant.Standard;
     }
 
-    export function getEmitScriptTarget(compilerOptions: CompilerOptions) {
-        return compilerOptions.target || ScriptTarget.ES3;
+    export function getEmitScriptTarget(compilerOptions: {module?: CompilerOptions["module"], target?: CompilerOptions["target"]}) {
+        return compilerOptions.target ||
+            (compilerOptions.module === ModuleKind.Node12 && ScriptTarget.ES2020) ||
+            (compilerOptions.module === ModuleKind.NodeNext && ScriptTarget.ESNext) ||
+            ScriptTarget.ES3;
     }
 
     export function getEmitModuleKind(compilerOptions: {module?: CompilerOptions["module"], target?: CompilerOptions["target"]}) {
@@ -6083,7 +6090,20 @@ namespace ts {
     export function getEmitModuleResolutionKind(compilerOptions: CompilerOptions) {
         let moduleResolution = compilerOptions.moduleResolution;
         if (moduleResolution === undefined) {
-            moduleResolution = getEmitModuleKind(compilerOptions) === ModuleKind.CommonJS ? ModuleResolutionKind.NodeJs : ModuleResolutionKind.Classic;
+            switch (getEmitModuleKind(compilerOptions)) {
+                case ModuleKind.CommonJS:
+                    moduleResolution = ModuleResolutionKind.NodeJs;
+                    break;
+                case ModuleKind.Node12:
+                    moduleResolution = ModuleResolutionKind.Node12;
+                    break;
+                case ModuleKind.NodeNext:
+                    moduleResolution = ModuleResolutionKind.NodeNext;
+                    break;
+                default:
+                    moduleResolution = ModuleResolutionKind.Classic;
+                    break;
+            }
         }
         return moduleResolution;
     }
@@ -6113,11 +6133,23 @@ namespace ts {
         return !!(getEmitDeclarations(options) && options.declarationMap);
     }
 
+    export function getESModuleInterop(compilerOptions: CompilerOptions) {
+        if (compilerOptions.esModuleInterop !== undefined) {
+            return compilerOptions.esModuleInterop;
+        }
+        switch (getEmitModuleKind(compilerOptions)) {
+            case ModuleKind.Node12:
+            case ModuleKind.NodeNext:
+                return true;
+        }
+        return undefined;
+    }
+
     export function getAllowSyntheticDefaultImports(compilerOptions: CompilerOptions) {
         const moduleKind = getEmitModuleKind(compilerOptions);
         return compilerOptions.allowSyntheticDefaultImports !== undefined
             ? compilerOptions.allowSyntheticDefaultImports
-            : compilerOptions.esModuleInterop ||
+            : getESModuleInterop(compilerOptions) ||
             moduleKind === ModuleKind.System;
     }
 
@@ -6153,7 +6185,7 @@ namespace ts {
     }
 
     export function getUseDefineForClassFields(compilerOptions: CompilerOptions): boolean {
-        return compilerOptions.useDefineForClassFields === undefined ? compilerOptions.target === ScriptTarget.ESNext : compilerOptions.useDefineForClassFields;
+        return compilerOptions.useDefineForClassFields === undefined ? getEmitScriptTarget(compilerOptions) === ScriptTarget.ESNext : compilerOptions.useDefineForClassFields;
     }
 
     export function compilerOptionsAffectSemanticDiagnostics(newOptions: CompilerOptions, oldOptions: CompilerOptions): boolean {
diff --git a/src/compiler/utilitiesPublic.ts b/src/compiler/utilitiesPublic.ts
index b9236521cba67..ae228d11a6727 100644
--- a/src/compiler/utilitiesPublic.ts
+++ b/src/compiler/utilitiesPublic.ts
@@ -11,7 +11,7 @@ namespace ts {
     }
 
     export function getDefaultLibFileName(options: CompilerOptions): string {
-        switch (options.target) {
+        switch (getEmitScriptTarget(options)) {
             case ScriptTarget.ESNext:
                 return "lib.esnext.full.d.ts";
             case ScriptTarget.ES2021:
diff --git a/src/compiler/watch.ts b/src/compiler/watch.ts
index 78dc141344741..d444e63c800c9 100644
--- a/src/compiler/watch.ts
+++ b/src/compiler/watch.ts
@@ -279,7 +279,7 @@ namespace ts {
                 );
             case FileIncludeKind.LibFile:
                 if (reason.index !== undefined) return chainDiagnosticMessages(/*details*/ undefined, Diagnostics.Library_0_specified_in_compilerOptions, options.lib![reason.index]);
-                const target = forEachEntry(targetOptionDeclaration.type, (value, key) => value === options.target ? key : undefined);
+                const target = forEachEntry(targetOptionDeclaration.type, (value, key) => value === getEmitScriptTarget(options) ? key : undefined);
                 return chainDiagnosticMessages(
                     /*details*/ undefined,
                     target ?
diff --git a/src/harness/compilerImpl.ts b/src/harness/compilerImpl.ts
index 41003356fc23a..7d42ccea2c0bd 100644
--- a/src/harness/compilerImpl.ts
+++ b/src/harness/compilerImpl.ts
@@ -249,7 +249,7 @@ namespace compiler {
         }
 
         // establish defaults (aligns with old harness)
-        if (compilerOptions.target === undefined) compilerOptions.target = ts.ScriptTarget.ES3;
+        if (compilerOptions.target === undefined && compilerOptions.module !== ts.ModuleKind.Node12 && compilerOptions.module !== ts.ModuleKind.NodeNext) compilerOptions.target = ts.ScriptTarget.ES3;
         if (compilerOptions.newLine === undefined) compilerOptions.newLine = ts.NewLineKind.CarriageReturnLineFeed;
         if (compilerOptions.skipDefaultLibCheck === undefined) compilerOptions.skipDefaultLibCheck = true;
         if (compilerOptions.noErrorTruncation === undefined) compilerOptions.noErrorTruncation = true;
diff --git a/src/harness/harnessIO.ts b/src/harness/harnessIO.ts
index a34e4a6e45f13..f7775ed98218a 100644
--- a/src/harness/harnessIO.ts
+++ b/src/harness/harnessIO.ts
@@ -265,7 +265,7 @@ namespace Harness {
         }
 
         export function getDefaultLibFileName(options: ts.CompilerOptions): string {
-            switch (options.target) {
+            switch (ts.getEmitScriptTarget(options)) {
                 case ts.ScriptTarget.ESNext:
                 case ts.ScriptTarget.ES2017:
                     return "lib.es2017.d.ts";
@@ -385,7 +385,7 @@ namespace Harness {
             symlinks?: vfs.FileSet
         ): compiler.CompilationResult {
             const options: ts.CompilerOptions & HarnessOptions = compilerOptions ? ts.cloneCompilerOptions(compilerOptions) : { noResolve: false };
-            options.target = options.target || ts.ScriptTarget.ES3;
+            options.target = ts.getEmitScriptTarget(options);
             options.newLine = options.newLine || ts.NewLineKind.CarriageReturnLineFeed;
             options.noErrorTruncation = true;
             options.skipDefaultLibCheck = typeof options.skipDefaultLibCheck === "undefined" ? true : options.skipDefaultLibCheck;
@@ -891,7 +891,7 @@ namespace Harness {
                     jsCode += "\r\n";
                 }
                 if (!result.diagnostics.length && !ts.endsWith(file.file, ts.Extension.Json)) {
-                    const fileParseResult = ts.createSourceFile(file.file, file.text, options.target || ts.ScriptTarget.ES3, /*parentNodes*/ false, ts.endsWith(file.file, "x") ? ts.ScriptKind.JSX : ts.ScriptKind.JS);
+                    const fileParseResult = ts.createSourceFile(file.file, file.text, ts.getEmitScriptTarget(options), /*parentNodes*/ false, ts.endsWith(file.file, "x") ? ts.ScriptKind.JSX : ts.ScriptKind.JS);
                     if (ts.length(fileParseResult.parseDiagnostics)) {
                         jsCode += getErrorBaseline([file.asTestFile()], fileParseResult.parseDiagnostics);
                         return;
diff --git a/src/services/codefixes/convertFunctionToEs6Class.ts b/src/services/codefixes/convertFunctionToEs6Class.ts
index 70de7a1978d14..8a20f68840d4c 100644
--- a/src/services/codefixes/convertFunctionToEs6Class.ts
+++ b/src/services/codefixes/convertFunctionToEs6Class.ts
@@ -259,7 +259,7 @@ namespace ts.codefix {
         }
 
         if (isStringLiteralLike(propName)) {
-            return isIdentifierText(propName.text, compilerOptions.target) ? factory.createIdentifier(propName.text)
+            return isIdentifierText(propName.text, getEmitScriptTarget(compilerOptions)) ? factory.createIdentifier(propName.text)
                 : isNoSubstitutionTemplateLiteral(propName) ? factory.createStringLiteral(propName.text, quotePreference === QuotePreference.Single)
                 : propName;
         }
diff --git a/src/services/codefixes/convertToEs6Module.ts b/src/services/codefixes/convertToEs6Module.ts
index e15c507a4ef65..1a5a92abb78f8 100644
--- a/src/services/codefixes/convertToEs6Module.ts
+++ b/src/services/codefixes/convertToEs6Module.ts
@@ -5,7 +5,7 @@ namespace ts.codefix {
         getCodeActions(context) {
             const { sourceFile, program, preferences } = context;
             const changes = textChanges.ChangeTracker.with(context, changes => {
-                const moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, program.getCompilerOptions().target!, getQuotePreference(sourceFile, preferences));
+                const moduleExportsChangedToDefault = convertFileToEs6Module(sourceFile, program.getTypeChecker(), changes, getEmitScriptTarget(program.getCompilerOptions()), getQuotePreference(sourceFile, preferences));
                 if (moduleExportsChangedToDefault) {
                     for (const importingFile of program.getSourceFiles()) {
                         fixImportOfModuleExports(importingFile, sourceFile, changes, getQuotePreference(importingFile, preferences));
diff --git a/src/services/codefixes/fixModuleAndTargetOptions.ts b/src/services/codefixes/fixModuleAndTargetOptions.ts
index 16ea0fab7fd07..45e1185cac909 100644
--- a/src/services/codefixes/fixModuleAndTargetOptions.ts
+++ b/src/services/codefixes/fixModuleAndTargetOptions.ts
@@ -2,8 +2,8 @@
 namespace ts.codefix {
     registerCodeFix({
         errorCodes: [
-            Diagnostics.Top_level_await_expressions_are_only_allowed_when_the_module_option_is_set_to_esnext_or_system_and_the_target_option_is_set_to_es2017_or_higher.code,
-            Diagnostics.Top_level_for_await_loops_are_only_allowed_when_the_module_option_is_set_to_esnext_or_system_and_the_target_option_is_set_to_es2017_or_higher.code,
+            Diagnostics.Top_level_await_expressions_are_only_allowed_when_the_module_option_is_set_to_esnext_system_or_nodenext_and_the_target_option_is_set_to_es2017_or_higher.code,
+            Diagnostics.Top_level_for_await_loops_are_only_allowed_when_the_module_option_is_set_to_esnext_system_or_nodenext_and_the_target_option_is_set_to_es2017_or_higher.code,
         ],
         getCodeActions: context => {
             const compilerOptions = context.program.getCompilerOptions();
diff --git a/src/services/codefixes/fixSpelling.ts b/src/services/codefixes/fixSpelling.ts
index 457ccc5ee672e..c7b1d66391048 100644
--- a/src/services/codefixes/fixSpelling.ts
+++ b/src/services/codefixes/fixSpelling.ts
@@ -22,15 +22,15 @@ namespace ts.codefix {
             const info = getInfo(sourceFile, context.span.start, context, errorCode);
             if (!info) return undefined;
             const { node, suggestedSymbol } = info;
-            const { target } = context.host.getCompilationSettings();
-            const changes = textChanges.ChangeTracker.with(context, t => doChange(t, sourceFile, node, suggestedSymbol, target!));
+            const target = getEmitScriptTarget(context.host.getCompilationSettings());
+            const changes = textChanges.ChangeTracker.with(context, t => doChange(t, sourceFile, node, suggestedSymbol, target));
             return [createCodeFixAction("spelling", changes, [Diagnostics.Change_spelling_to_0, symbolName(suggestedSymbol)], fixId, Diagnostics.Fix_all_detected_spelling_errors)];
         },
         fixIds: [fixId],
         getAllCodeActions: context => codeFixAll(context, errorCodes, (changes, diag) => {
             const info = getInfo(diag.file, diag.start, context, diag.code);
-            const { target } = context.host.getCompilationSettings();
-            if (info) doChange(changes, context.sourceFile, info.node, info.suggestedSymbol, target!);
+            const target = getEmitScriptTarget(context.host.getCompilationSettings());
+            if (info) doChange(changes, context.sourceFile, info.node, info.suggestedSymbol, target);
         }),
     });
 
diff --git a/src/services/codefixes/importFixes.ts b/src/services/codefixes/importFixes.ts
index fce07020f68e2..eac78eb66dc68 100644
--- a/src/services/codefixes/importFixes.ts
+++ b/src/services/codefixes/importFixes.ts
@@ -255,7 +255,7 @@ namespace ts.codefix {
             }
 
             const defaultInfo = getDefaultLikeExportInfo(moduleSymbol, checker, compilerOptions);
-            if (defaultInfo && (defaultInfo.name === symbolName || moduleSymbolToValidIdentifier(moduleSymbol, compilerOptions.target) === symbolName) && skipAlias(defaultInfo.symbol, checker) === exportedSymbol && isImportable(program, moduleFile, isFromPackageJson)) {
+            if (defaultInfo && (defaultInfo.name === symbolName || moduleSymbolToValidIdentifier(moduleSymbol, getEmitScriptTarget(compilerOptions)) === symbolName) && skipAlias(defaultInfo.symbol, checker) === exportedSymbol && isImportable(program, moduleFile, isFromPackageJson)) {
                 result.push({ symbol: defaultInfo.symbol, moduleSymbol, moduleFileName: moduleFile?.fileName, exportKind: defaultInfo.exportKind, isTypeOnly: isTypeOnlySymbol(defaultInfo.symbol, checker), isFromPackageJson });
             }
 
@@ -590,6 +590,9 @@ namespace ts.codefix {
             case ModuleKind.None:
                 // Fall back to the `import * as ns` style import.
                 return ImportKind.Namespace;
+            case ModuleKind.Node12:
+            case ModuleKind.NodeNext:
+                return importingFile.impliedNodeFormat === ModuleKind.ESNext ? ImportKind.Namespace : ImportKind.CommonJS;
             default:
                 return Debug.assertNever(moduleKind, `Unexpected moduleKind ${moduleKind}`);
         }
@@ -655,7 +658,7 @@ namespace ts.codefix {
 
             const compilerOptions = program.getCompilerOptions();
             const defaultInfo = getDefaultLikeExportInfo(moduleSymbol, checker, compilerOptions);
-            if (defaultInfo && (defaultInfo.name === symbolName || moduleSymbolToValidIdentifier(moduleSymbol, compilerOptions.target) === symbolName) && symbolHasMeaning(defaultInfo.symbolForMeaning, currentTokenMeaning)) {
+            if (defaultInfo && (defaultInfo.name === symbolName || moduleSymbolToValidIdentifier(moduleSymbol, getEmitScriptTarget(compilerOptions)) === symbolName) && symbolHasMeaning(defaultInfo.symbolForMeaning, currentTokenMeaning)) {
                 addSymbol(moduleSymbol, sourceFile, defaultInfo.symbol, defaultInfo.exportKind, program, isFromPackageJson);
             }
 
diff --git a/src/services/completions.ts b/src/services/completions.ts
index f5f9824b0ad4e..d1c04aaa22189 100644
--- a/src/services/completions.ts
+++ b/src/services/completions.ts
@@ -417,7 +417,7 @@ namespace ts.Completions {
                 location,
                 sourceFile,
                 typeChecker,
-                compilerOptions.target!,
+                getEmitScriptTarget(compilerOptions),
                 log,
                 completionKind,
                 preferences,
@@ -431,7 +431,7 @@ namespace ts.Completions {
                 symbolToOriginInfoMap,
                 symbolToSortTextIdMap
             );
-            getJSCompletionEntries(sourceFile, location.pos, uniqueNames, compilerOptions.target!, entries); // TODO: GH#18217
+            getJSCompletionEntries(sourceFile, location.pos, uniqueNames, getEmitScriptTarget(compilerOptions), entries); // TODO: GH#18217
         }
         else {
             if (!isNewIdentifierLocation && (!symbols || symbols.length === 0) && keywordFilters === KeywordCompletionFilters.None) {
@@ -445,7 +445,7 @@ namespace ts.Completions {
                 location,
                 sourceFile,
                 typeChecker,
-                compilerOptions.target!,
+                getEmitScriptTarget(compilerOptions),
                 log,
                 completionKind,
                 preferences,
@@ -956,7 +956,7 @@ namespace ts.Completions {
         // completion entry.
         return firstDefined(symbols, (symbol, index): SymbolCompletion | undefined => {
             const origin = symbolToOriginInfoMap[index];
-            const info = getCompletionEntryDisplayNameForSymbol(symbol, compilerOptions.target!, origin, completionKind, completionData.isJsxIdentifierExpected);
+            const info = getCompletionEntryDisplayNameForSymbol(symbol, getEmitScriptTarget(compilerOptions), origin, completionKind, completionData.isJsxIdentifierExpected);
             return info && info.name === entryId.name && getSourceFromOrigin(origin) === entryId.source
                 ? { type: "symbol" as const, symbol, location, origin, previousToken, isJsxInitializer, isTypeOnlyLocation }
                 : undefined;
@@ -1076,7 +1076,7 @@ namespace ts.Completions {
             exportedSymbol,
             moduleSymbol,
             sourceFile,
-            getNameForExportedSymbol(symbol, compilerOptions.target),
+            getNameForExportedSymbol(symbol, getEmitScriptTarget(compilerOptions)),
             host,
             program,
             formatContext,
diff --git a/src/services/documentRegistry.ts b/src/services/documentRegistry.ts
index 77e64bf618bd2..719f219025929 100644
--- a/src/services/documentRegistry.ts
+++ b/src/services/documentRegistry.ts
@@ -201,7 +201,7 @@ namespace ts {
             acquiring: boolean,
             scriptKind?: ScriptKind): SourceFile {
             scriptKind = ensureScriptKind(fileName, scriptKind);
-            const scriptTarget = scriptKind === ScriptKind.JSON ? ScriptTarget.JSON : compilationSettings.target || ScriptTarget.ES5;
+            const scriptTarget = scriptKind === ScriptKind.JSON ? ScriptTarget.JSON : getEmitScriptTarget(compilationSettings);
             const bucket = getOrUpdate(buckets, key, () => new Map());
             const bucketEntry = bucket.get(path);
             let entry = bucketEntry && getDocumentRegistryEntry(bucketEntry, scriptKind);
diff --git a/src/services/stringCompletions.ts b/src/services/stringCompletions.ts
index ac0c1baeb6907..9255898ca7289 100644
--- a/src/services/stringCompletions.ts
+++ b/src/services/stringCompletions.ts
@@ -91,6 +91,12 @@ namespace ts.Completions.StringCompletions {
             case Extension.Jsx: return ScriptElementKindModifier.jsxModifier;
             case Extension.Ts: return ScriptElementKindModifier.tsModifier;
             case Extension.Tsx: return ScriptElementKindModifier.tsxModifier;
+            case Extension.Dmts: return ScriptElementKindModifier.dmtsModifier;
+            case Extension.Mjs: return ScriptElementKindModifier.mjsModifier;
+            case Extension.Mts: return ScriptElementKindModifier.mtsModifier;
+            case Extension.Dcts: return ScriptElementKindModifier.dctsModifier;
+            case Extension.Cjs: return ScriptElementKindModifier.cjsModifier;
+            case Extension.Cts: return ScriptElementKindModifier.ctsModifier;
             case Extension.TsBuildInfo: return Debug.fail(`Extension ${Extension.TsBuildInfo} is unsupported.`);
             case undefined: return ScriptElementKindModifier.none;
             default:
diff --git a/src/services/transpile.ts b/src/services/transpile.ts
index 0ac54f8d172ca..5b73b91bd7f47 100644
--- a/src/services/transpile.ts
+++ b/src/services/transpile.ts
@@ -48,7 +48,7 @@ namespace ts {
 
         // if jsx is specified then treat file as .tsx
         const inputFileName = transpileOptions.fileName || (transpileOptions.compilerOptions && transpileOptions.compilerOptions.jsx ? "module.tsx" : "module.ts");
-        const sourceFile = createSourceFile(inputFileName, input, options.target!); // TODO: GH#18217
+        const sourceFile = createSourceFile(inputFileName, input, getEmitScriptTarget(options));
         if (transpileOptions.moduleName) {
             sourceFile.moduleName = transpileOptions.moduleName;
         }
diff --git a/src/services/types.ts b/src/services/types.ts
index 4ad9ddfa88946..ff323e392fa1b 100644
--- a/src/services/types.ts
+++ b/src/services/types.ts
@@ -1481,6 +1481,12 @@ namespace ts {
         jsModifier = ".js",
         jsxModifier = ".jsx",
         jsonModifier = ".json",
+        dmtsModifier = ".d.mts",
+        mtsModifier = ".mts",
+        mjsModifier = ".mjs",
+        dctsModifier = ".d.cts",
+        ctsModifier = ".cts",
+        cjsModifier = ".cjs",
     }
 
     export const enum ClassificationTypeNames {
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index cba0669f43d9f..d5edeb1246861 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -1842,7 +1842,7 @@ namespace ts {
         return program.getSourceFiles().some(s => !s.isDeclarationFile && !program.isSourceFileFromExternalLibrary(s) && !!s.externalModuleIndicator);
     }
     export function compilerOptionsIndicateEs6Modules(compilerOptions: CompilerOptions): boolean {
-        return !!compilerOptions.module || compilerOptions.target! >= ScriptTarget.ES2015 || !!compilerOptions.noEmit;
+        return !!compilerOptions.module || getEmitScriptTarget(compilerOptions) >= ScriptTarget.ES2015 || !!compilerOptions.noEmit;
     }
 
     export function createModuleSpecifierResolutionHost(program: Program, host: LanguageServiceHost): ModuleSpecifierResolutionHost {
diff --git a/src/testRunner/unittests/config/commandLineParsing.ts b/src/testRunner/unittests/config/commandLineParsing.ts
index 2b973991f8c41..50bb22cdfbc8e 100644
--- a/src/testRunner/unittests/config/commandLineParsing.ts
+++ b/src/testRunner/unittests/config/commandLineParsing.ts
@@ -159,7 +159,7 @@ namespace ts {
                         start: undefined,
                         length: undefined,
                     }, {
-                        messageText: "Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext'.",
+                        messageText: "Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext', 'node12', 'nodenext'.",
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
 
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 8b537d952f339..51398e9b34d45 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -1989,6 +1989,18 @@ declare namespace ts {
          */
         hasNoDefaultLib: boolean;
         languageVersion: ScriptTarget;
+        /**
+         * When `module` is `Node12` or `NodeNext`, this field controls weather the
+         * source file in question is an ESNext-output-format file, or a CommonJS-output-format
+         * module. This is derived by the module resolver as it looks up the file, since
+         * it is derived from either the file extension of the module, or the containing
+         * `package.json` context, and affects both checking and emit.
+         *
+         * It is _public_ so that (pre)transformers can set this field,
+         * since it switches the builtin `node` module transform. Generally speaking, if unset,
+         * the field is treated as though it is `ModuleKind.CommonJS`.
+         */
+        impliedNodeFormat?: ModuleKind.ESNext | ModuleKind.CommonJS;
     }
     export interface Bundle extends Node {
         readonly kind: SyntaxKind.Bundle;
@@ -2803,7 +2815,9 @@ declare namespace ts {
     }
     export enum ModuleResolutionKind {
         Classic = 1,
-        NodeJs = 2
+        NodeJs = 2,
+        Node12 = 3,
+        NodeNext = 99
     }
     export interface PluginImport {
         name: string;
@@ -2964,7 +2978,9 @@ declare namespace ts {
         System = 4,
         ES2015 = 5,
         ES2020 = 6,
-        ESNext = 99
+        ESNext = 99,
+        Node12 = 100,
+        NodeNext = 199
     }
     export enum JsxEmit {
         None = 0,
@@ -3109,7 +3125,13 @@ declare namespace ts {
         Js = ".js",
         Jsx = ".jsx",
         Json = ".json",
-        TsBuildInfo = ".tsbuildinfo"
+        TsBuildInfo = ".tsbuildinfo",
+        Mjs = ".mjs",
+        Mts = ".mts",
+        Dmts = ".d.mts",
+        Cjs = ".cjs",
+        Cts = ".cts",
+        Dcts = ".d.cts"
     }
     export interface ResolvedModuleWithFailedLookupLocations {
         readonly resolvedModule: ResolvedModuleFull | undefined;
@@ -4756,6 +4778,14 @@ declare namespace ts {
     export {};
 }
 declare namespace ts {
+    interface ModuleResolutionState {
+        host: ModuleResolutionHost;
+        compilerOptions: CompilerOptions;
+        traceEnabled: boolean;
+        failedLookupLocations: Push<string>;
+        resultFromCache?: ResolvedModuleWithFailedLookupLocations;
+        packageJsonInfoCache: PackageJsonInfoCache | undefined;
+    }
     export function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
     /**
      * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
@@ -4918,6 +4948,17 @@ declare namespace ts {
     export function formatDiagnosticsWithColorAndContext(diagnostics: readonly Diagnostic[], host: FormatDiagnosticsHost): string;
     export function flattenDiagnosticMessageText(diag: string | DiagnosticMessageChain | undefined, newLine: string, indent?: number): string;
     export function getConfigFileParsingDiagnostics(configFileParseResult: ParsedCommandLine): readonly Diagnostic[];
+    /**
+     * A function for determining if a given file is esm or cjs format, assuming modern node module resolution rules, as configured by the
+     * `options` parameter.
+     *
+     * @param fileName The normalized absolute path to check the format of (it need not exist on disk)
+     * @param packageJsonInfoCache (Optional) A cache for package file lookups - it's best to have a cache when this function is called often
+     * @param host The ModuleResolutionHost which can perform the filesystem lookups for package json data
+     * @param options The compiler options to perform the analysis under - relevant options are `moduleResolution` and `traceResolution`
+     * @returns `undefined` if the path has no relevant implied format, `ModuleKind.ESNext` for esm format, and `ModuleKind.CommonJS` for cjs format
+     */
+    export function getImpliedNodeFormatForFile(fileName: Path, packageJsonInfoCache: PackageJsonInfoCache | undefined, host: ModuleResolutionHost, options: CompilerOptions): ModuleKind.ESNext | ModuleKind.CommonJS | undefined;
     /**
      * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
      * that represent a compilation unit.
@@ -6501,7 +6542,13 @@ declare namespace ts {
         tsxModifier = ".tsx",
         jsModifier = ".js",
         jsxModifier = ".jsx",
-        jsonModifier = ".json"
+        jsonModifier = ".json",
+        dmtsModifier = ".d.mts",
+        mtsModifier = ".mts",
+        mjsModifier = ".mjs",
+        dctsModifier = ".d.cts",
+        ctsModifier = ".cts",
+        cjsModifier = ".cjs"
     }
     enum ClassificationTypeNames {
         comment = "comment",
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index e81307d6ecb72..017e6f61628db 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -1989,6 +1989,18 @@ declare namespace ts {
          */
         hasNoDefaultLib: boolean;
         languageVersion: ScriptTarget;
+        /**
+         * When `module` is `Node12` or `NodeNext`, this field controls weather the
+         * source file in question is an ESNext-output-format file, or a CommonJS-output-format
+         * module. This is derived by the module resolver as it looks up the file, since
+         * it is derived from either the file extension of the module, or the containing
+         * `package.json` context, and affects both checking and emit.
+         *
+         * It is _public_ so that (pre)transformers can set this field,
+         * since it switches the builtin `node` module transform. Generally speaking, if unset,
+         * the field is treated as though it is `ModuleKind.CommonJS`.
+         */
+        impliedNodeFormat?: ModuleKind.ESNext | ModuleKind.CommonJS;
     }
     export interface Bundle extends Node {
         readonly kind: SyntaxKind.Bundle;
@@ -2803,7 +2815,9 @@ declare namespace ts {
     }
     export enum ModuleResolutionKind {
         Classic = 1,
-        NodeJs = 2
+        NodeJs = 2,
+        Node12 = 3,
+        NodeNext = 99
     }
     export interface PluginImport {
         name: string;
@@ -2964,7 +2978,9 @@ declare namespace ts {
         System = 4,
         ES2015 = 5,
         ES2020 = 6,
-        ESNext = 99
+        ESNext = 99,
+        Node12 = 100,
+        NodeNext = 199
     }
     export enum JsxEmit {
         None = 0,
@@ -3109,7 +3125,13 @@ declare namespace ts {
         Js = ".js",
         Jsx = ".jsx",
         Json = ".json",
-        TsBuildInfo = ".tsbuildinfo"
+        TsBuildInfo = ".tsbuildinfo",
+        Mjs = ".mjs",
+        Mts = ".mts",
+        Dmts = ".d.mts",
+        Cjs = ".cjs",
+        Cts = ".cts",
+        Dcts = ".d.cts"
     }
     export interface ResolvedModuleWithFailedLookupLocations {
         readonly resolvedModule: ResolvedModuleFull | undefined;
@@ -4756,6 +4778,14 @@ declare namespace ts {
     export {};
 }
 declare namespace ts {
+    interface ModuleResolutionState {
+        host: ModuleResolutionHost;
+        compilerOptions: CompilerOptions;
+        traceEnabled: boolean;
+        failedLookupLocations: Push<string>;
+        resultFromCache?: ResolvedModuleWithFailedLookupLocations;
+        packageJsonInfoCache: PackageJsonInfoCache | undefined;
+    }
     export function getEffectiveTypeRoots(options: CompilerOptions, host: GetEffectiveTypeRootsHost): string[] | undefined;
     /**
      * @param {string | undefined} containingFile - file that contains type reference directive, can be undefined if containing file is unknown.
@@ -4918,6 +4948,17 @@ declare namespace ts {
     export function formatDiagnosticsWithColorAndContext(diagnostics: readonly Diagnostic[], host: FormatDiagnosticsHost): string;
     export function flattenDiagnosticMessageText(diag: string | DiagnosticMessageChain | undefined, newLine: string, indent?: number): string;
     export function getConfigFileParsingDiagnostics(configFileParseResult: ParsedCommandLine): readonly Diagnostic[];
+    /**
+     * A function for determining if a given file is esm or cjs format, assuming modern node module resolution rules, as configured by the
+     * `options` parameter.
+     *
+     * @param fileName The normalized absolute path to check the format of (it need not exist on disk)
+     * @param packageJsonInfoCache (Optional) A cache for package file lookups - it's best to have a cache when this function is called often
+     * @param host The ModuleResolutionHost which can perform the filesystem lookups for package json data
+     * @param options The compiler options to perform the analysis under - relevant options are `moduleResolution` and `traceResolution`
+     * @returns `undefined` if the path has no relevant implied format, `ModuleKind.ESNext` for esm format, and `ModuleKind.CommonJS` for cjs format
+     */
+    export function getImpliedNodeFormatForFile(fileName: Path, packageJsonInfoCache: PackageJsonInfoCache | undefined, host: ModuleResolutionHost, options: CompilerOptions): ModuleKind.ESNext | ModuleKind.CommonJS | undefined;
     /**
      * Create a new 'Program' instance. A Program is an immutable collection of 'SourceFile's and a 'CompilerOptions'
      * that represent a compilation unit.
@@ -6501,7 +6542,13 @@ declare namespace ts {
         tsxModifier = ".tsx",
         jsModifier = ".js",
         jsxModifier = ".jsx",
-        jsonModifier = ".json"
+        jsonModifier = ".json",
+        dmtsModifier = ".d.mts",
+        mtsModifier = ".mts",
+        mjsModifier = ".mjs",
+        dctsModifier = ".d.cts",
+        ctsModifier = ".cts",
+        cjsModifier = ".cjs"
     }
     enum ClassificationTypeNames {
         comment = "comment",
diff --git a/tests/baselines/reference/awaitInNonAsyncFunction.errors.txt b/tests/baselines/reference/awaitInNonAsyncFunction.errors.txt
index ee1aa75d3cc74..6a5b413c154c2 100644
--- a/tests/baselines/reference/awaitInNonAsyncFunction.errors.txt
+++ b/tests/baselines/reference/awaitInNonAsyncFunction.errors.txt
@@ -12,8 +12,8 @@ tests/cases/compiler/awaitInNonAsyncFunction.ts(30,9): error TS1103: 'for await'
 tests/cases/compiler/awaitInNonAsyncFunction.ts(31,5): error TS1308: 'await' expressions are only allowed within async functions and at the top levels of modules.
 tests/cases/compiler/awaitInNonAsyncFunction.ts(34,7): error TS1103: 'for await' loops are only allowed within async functions and at the top levels of modules.
 tests/cases/compiler/awaitInNonAsyncFunction.ts(35,5): error TS1308: 'await' expressions are only allowed within async functions and at the top levels of modules.
-tests/cases/compiler/awaitInNonAsyncFunction.ts(39,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
-tests/cases/compiler/awaitInNonAsyncFunction.ts(40,1): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+tests/cases/compiler/awaitInNonAsyncFunction.ts(39,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/compiler/awaitInNonAsyncFunction.ts(40,1): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
 
 
 ==== tests/cases/compiler/awaitInNonAsyncFunction.ts (16 errors) ====
@@ -97,7 +97,7 @@ tests/cases/compiler/awaitInNonAsyncFunction.ts(40,1): error TS1378: Top-level '
     
     for await (const _ of []);
         ~~~~~
-!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
     await null;
     ~~~~~
-!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
\ No newline at end of file
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
\ No newline at end of file
diff --git a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=node12).js b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=node12).js
new file mode 100644
index 0000000000000..8aed6c9347aa2
--- /dev/null
+++ b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=node12).js
@@ -0,0 +1,27 @@
+//// [a.ts]
+declare var dec: any, __decorate: any;
+@dec export class A {
+}
+
+const o = { a: 1 };
+const y = { ...o };
+
+
+//// [a.js]
+"use strict";
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
+    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
+    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
+    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
+    return c > 3 && r && Object.defineProperty(target, key, r), r;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.A = void 0;
+let A = class A {
+};
+A = __decorate([
+    dec
+], A);
+exports.A = A;
+const o = { a: 1 };
+const y = Object.assign({}, o);
diff --git a/tests/baselines/reference/emitHelpersWithLocalCollisions(module=nodenext).js b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=nodenext).js
new file mode 100644
index 0000000000000..8aed6c9347aa2
--- /dev/null
+++ b/tests/baselines/reference/emitHelpersWithLocalCollisions(module=nodenext).js
@@ -0,0 +1,27 @@
+//// [a.ts]
+declare var dec: any, __decorate: any;
+@dec export class A {
+}
+
+const o = { a: 1 };
+const y = { ...o };
+
+
+//// [a.js]
+"use strict";
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
+    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
+    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
+    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
+    return c > 3 && r && Object.defineProperty(target, key, r), r;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.A = void 0;
+let A = class A {
+};
+A = __decorate([
+    dec
+], A);
+exports.A = A;
+const o = { a: 1 };
+const y = Object.assign({}, o);
diff --git a/tests/baselines/reference/importCallExpressionErrorInES2015.errors.txt b/tests/baselines/reference/importCallExpressionErrorInES2015.errors.txt
index d55a470765854..95937040daa0d 100644
--- a/tests/baselines/reference/importCallExpressionErrorInES2015.errors.txt
+++ b/tests/baselines/reference/importCallExpressionErrorInES2015.errors.txt
@@ -1,6 +1,6 @@
-tests/cases/conformance/dynamicImport/1.ts(1,1): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/dynamicImport/1.ts(2,10): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/dynamicImport/1.ts(8,16): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+tests/cases/conformance/dynamicImport/1.ts(1,1): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/dynamicImport/1.ts(2,10): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/dynamicImport/1.ts(8,16): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
 
 
 ==== tests/cases/conformance/dynamicImport/0.ts (0 errors) ====
@@ -9,10 +9,10 @@ tests/cases/conformance/dynamicImport/1.ts(8,16): error TS1323: Dynamic imports
 ==== tests/cases/conformance/dynamicImport/1.ts (3 errors) ====
     import("./0");
     ~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     var p1 = import("./0");
              ~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     p1.then(zero => {
         return zero.foo();
     })
@@ -20,5 +20,5 @@ tests/cases/conformance/dynamicImport/1.ts(8,16): error TS1323: Dynamic imports
     function foo() {
         const p2 = import("./0");
                    ~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/importCallExpressionNestedES2015.errors.txt b/tests/baselines/reference/importCallExpressionNestedES2015.errors.txt
index 6a0efe8747b20..4d1f7a55b3ce8 100644
--- a/tests/baselines/reference/importCallExpressionNestedES2015.errors.txt
+++ b/tests/baselines/reference/importCallExpressionNestedES2015.errors.txt
@@ -1,5 +1,5 @@
-tests/cases/conformance/dynamicImport/index.ts(2,18): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/dynamicImport/index.ts(2,32): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+tests/cases/conformance/dynamicImport/index.ts(2,18): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/dynamicImport/index.ts(2,32): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
 
 
 ==== tests/cases/conformance/dynamicImport/foo.ts (0 errors) ====
@@ -9,7 +9,7 @@ tests/cases/conformance/dynamicImport/index.ts(2,32): error TS1323: Dynamic impo
     async function foo() {
         return await import((await import("./foo")).default);
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
                                    ~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/importCallExpressionNestedES20152.errors.txt b/tests/baselines/reference/importCallExpressionNestedES20152.errors.txt
index 6a0efe8747b20..4d1f7a55b3ce8 100644
--- a/tests/baselines/reference/importCallExpressionNestedES20152.errors.txt
+++ b/tests/baselines/reference/importCallExpressionNestedES20152.errors.txt
@@ -1,5 +1,5 @@
-tests/cases/conformance/dynamicImport/index.ts(2,18): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/dynamicImport/index.ts(2,32): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+tests/cases/conformance/dynamicImport/index.ts(2,18): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/dynamicImport/index.ts(2,32): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
 
 
 ==== tests/cases/conformance/dynamicImport/foo.ts (0 errors) ====
@@ -9,7 +9,7 @@ tests/cases/conformance/dynamicImport/index.ts(2,32): error TS1323: Dynamic impo
     async function foo() {
         return await import((await import("./foo")).default);
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
                                    ~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     }
\ No newline at end of file
diff --git a/tests/baselines/reference/importMeta(module=commonjs,target=es5).errors.txt b/tests/baselines/reference/importMeta(module=commonjs,target=es5).errors.txt
index c152da9696952..ba01672d75a8f 100644
--- a/tests/baselines/reference/importMeta(module=commonjs,target=es5).errors.txt
+++ b/tests/baselines/reference/importMeta(module=commonjs,target=es5).errors.txt
@@ -1,25 +1,25 @@
 error TS2468: Cannot find global value 'Promise'.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,32): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,32): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,44): error TS2339: Property 'blah' does not exist on type 'ImportMeta'.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,51): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,51): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,63): error TS2339: Property 'blue' does not exist on type 'ImportMeta'.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,70): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(2,1): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,70): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(2,1): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(2,1): error TS2364: The left-hand side of an assignment expression must be a variable or a property access.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(11,21): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(11,21): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/example.ts(2,2): error TS2705: An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option.
-tests/cases/conformance/es2019/importMeta/example.ts(3,59): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
-tests/cases/conformance/es2019/importMeta/example.ts(6,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/example.ts(3,59): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
+tests/cases/conformance/es2019/importMeta/example.ts(6,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/example.ts(6,28): error TS2339: Property 'scriptElement' does not exist on type 'ImportMeta'.
-tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(1,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
-tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(2,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(1,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
+tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(2,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(2,23): error TS17012: 'metal' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
-tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(3,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(3,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(3,23): error TS17012: 'import' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
-tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(1,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
-tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(2,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(1,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
+tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(2,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(2,22): error TS17012: 'metal' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
-tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,22): error TS17012: 'import' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
 
 
@@ -31,12 +31,12 @@ tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,22): error TS
 !!! error TS2705: An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option.
       const response = await fetch(new URL("../hamsters.jpg", import.meta.url).toString());
                                                               ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
       const blob = await response.blob();
     
       const size = import.meta.scriptElement.dataset.size || 300;
                    ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                                ~~~~~~~~~~~~~
 !!! error TS2339: Property 'scriptElement' does not exist on type 'ImportMeta'.
     
@@ -50,48 +50,48 @@ tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,22): error TS
 ==== tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts (5 errors) ====
     export let x = import.meta;
                    ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
     export let y = import.metal;
                    ~~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                           ~~~~~
 !!! error TS17012: 'metal' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
     export let z = import.import.import.malkovich;
                    ~~~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                           ~~~~~~
 !!! error TS17012: 'import' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
     
 ==== tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts (5 errors) ====
     let globalA = import.meta;
                   ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
     let globalB = import.metal;
                   ~~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                          ~~~~~
 !!! error TS17012: 'metal' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
     let globalC = import.import.import.malkovich;
                   ~~~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                          ~~~~~~
 !!! error TS17012: 'import' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
     
 ==== tests/cases/conformance/es2019/importMeta/assignmentTargets.ts (8 errors) ====
     export const foo: ImportMeta = import.meta.blah = import.meta.blue = import.meta;
                                    ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                                                ~~~~
 !!! error TS2339: Property 'blah' does not exist on type 'ImportMeta'.
                                                       ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                                                                   ~~~~
 !!! error TS2339: Property 'blue' does not exist on type 'ImportMeta'.
                                                                          ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
     import.meta = foo;
     ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
     ~~~~~~~~~~~
 !!! error TS2364: The left-hand side of an assignment expression must be a variable or a property access.
     
@@ -104,4 +104,4 @@ tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,22): error TS
     
     const { a, b, c } = import.meta.wellKnownProperty;
                         ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
\ No newline at end of file
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
\ No newline at end of file
diff --git a/tests/baselines/reference/importMeta(module=commonjs,target=esnext).errors.txt b/tests/baselines/reference/importMeta(module=commonjs,target=esnext).errors.txt
index c152da9696952..ba01672d75a8f 100644
--- a/tests/baselines/reference/importMeta(module=commonjs,target=esnext).errors.txt
+++ b/tests/baselines/reference/importMeta(module=commonjs,target=esnext).errors.txt
@@ -1,25 +1,25 @@
 error TS2468: Cannot find global value 'Promise'.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,32): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,32): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,44): error TS2339: Property 'blah' does not exist on type 'ImportMeta'.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,51): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,51): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,63): error TS2339: Property 'blue' does not exist on type 'ImportMeta'.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,70): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(2,1): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(1,70): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(2,1): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(2,1): error TS2364: The left-hand side of an assignment expression must be a variable or a property access.
-tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(11,21): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/assignmentTargets.ts(11,21): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/example.ts(2,2): error TS2705: An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option.
-tests/cases/conformance/es2019/importMeta/example.ts(3,59): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
-tests/cases/conformance/es2019/importMeta/example.ts(6,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/example.ts(3,59): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
+tests/cases/conformance/es2019/importMeta/example.ts(6,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/example.ts(6,28): error TS2339: Property 'scriptElement' does not exist on type 'ImportMeta'.
-tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(1,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
-tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(2,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(1,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
+tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(2,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(2,23): error TS17012: 'metal' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
-tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(3,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(3,16): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts(3,23): error TS17012: 'import' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
-tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(1,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
-tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(2,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(1,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
+tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(2,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(2,22): error TS17012: 'metal' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
-tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,15): error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
 tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,22): error TS17012: 'import' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
 
 
@@ -31,12 +31,12 @@ tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,22): error TS
 !!! error TS2705: An async function or method in ES5/ES3 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option.
       const response = await fetch(new URL("../hamsters.jpg", import.meta.url).toString());
                                                               ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
       const blob = await response.blob();
     
       const size = import.meta.scriptElement.dataset.size || 300;
                    ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                                ~~~~~~~~~~~~~
 !!! error TS2339: Property 'scriptElement' does not exist on type 'ImportMeta'.
     
@@ -50,48 +50,48 @@ tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,22): error TS
 ==== tests/cases/conformance/es2019/importMeta/moduleLookingFile01.ts (5 errors) ====
     export let x = import.meta;
                    ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
     export let y = import.metal;
                    ~~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                           ~~~~~
 !!! error TS17012: 'metal' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
     export let z = import.import.import.malkovich;
                    ~~~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                           ~~~~~~
 !!! error TS17012: 'import' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
     
 ==== tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts (5 errors) ====
     let globalA = import.meta;
                   ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
     let globalB = import.metal;
                   ~~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                          ~~~~~
 !!! error TS17012: 'metal' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
     let globalC = import.import.import.malkovich;
                   ~~~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                          ~~~~~~
 !!! error TS17012: 'import' is not a valid meta-property for keyword 'import'. Did you mean 'meta'?
     
 ==== tests/cases/conformance/es2019/importMeta/assignmentTargets.ts (8 errors) ====
     export const foo: ImportMeta = import.meta.blah = import.meta.blue = import.meta;
                                    ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                                                ~~~~
 !!! error TS2339: Property 'blah' does not exist on type 'ImportMeta'.
                                                       ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
                                                                   ~~~~
 !!! error TS2339: Property 'blue' does not exist on type 'ImportMeta'.
                                                                          ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
     import.meta = foo;
     ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
     ~~~~~~~~~~~
 !!! error TS2364: The left-hand side of an assignment expression must be a variable or a property access.
     
@@ -104,4 +104,4 @@ tests/cases/conformance/es2019/importMeta/scriptLookingFile01.ts(3,22): error TS
     
     const { a, b, c } = import.meta.wellKnownProperty;
                         ~~~~~~~~~~~
-!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', or 'system'.
\ No newline at end of file
+!!! error TS1343: The 'import.meta' meta-property is only allowed when the '--module' option is 'es2020', 'esnext', 'system', 'node12', or 'nodenext'.
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModules1(module=node12).js b/tests/baselines/reference/nodeModules1(module=node12).js
new file mode 100644
index 0000000000000..3742bb13c5f2a
--- /dev/null
+++ b/tests/baselines/reference/nodeModules1(module=node12).js
@@ -0,0 +1,58 @@
+//// [tests/cases/conformance/node/nodeModules1.ts] ////
+
+//// [index.ts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.ts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.ts]
+// esm format file
+const x = 1;
+export {x};
+//// [index.ts]
+// esm format file
+const x = 1;
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [package.json]
+{
+}
+//// [package.json]
+{
+    "type": "module"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = 1;
+export { x };
+//// [index.js]
+// esm format file
+const x = 1;
+export { x };
diff --git a/tests/baselines/reference/nodeModules1(module=node12).symbols b/tests/baselines/reference/nodeModules1(module=node12).symbols
new file mode 100644
index 0000000000000..e1653429c87db
--- /dev/null
+++ b/tests/baselines/reference/nodeModules1(module=node12).symbols
@@ -0,0 +1,32 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.ts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.ts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModules1(module=node12).types b/tests/baselines/reference/nodeModules1(module=node12).types
new file mode 100644
index 0000000000000..1c479a5e7bd48
--- /dev/null
+++ b/tests/baselines/reference/nodeModules1(module=node12).types
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder2/index.ts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder2/another/index.ts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
diff --git a/tests/baselines/reference/nodeModules1(module=nodenext).js b/tests/baselines/reference/nodeModules1(module=nodenext).js
new file mode 100644
index 0000000000000..3742bb13c5f2a
--- /dev/null
+++ b/tests/baselines/reference/nodeModules1(module=nodenext).js
@@ -0,0 +1,58 @@
+//// [tests/cases/conformance/node/nodeModules1.ts] ////
+
+//// [index.ts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.ts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.ts]
+// esm format file
+const x = 1;
+export {x};
+//// [index.ts]
+// esm format file
+const x = 1;
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [package.json]
+{
+}
+//// [package.json]
+{
+    "type": "module"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = 1;
+export { x };
+//// [index.js]
+// esm format file
+const x = 1;
+export { x };
diff --git a/tests/baselines/reference/nodeModules1(module=nodenext).symbols b/tests/baselines/reference/nodeModules1(module=nodenext).symbols
new file mode 100644
index 0000000000000..e1653429c87db
--- /dev/null
+++ b/tests/baselines/reference/nodeModules1(module=nodenext).symbols
@@ -0,0 +1,32 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.ts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.ts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModules1(module=nodenext).types b/tests/baselines/reference/nodeModules1(module=nodenext).types
new file mode 100644
index 0000000000000..1c479a5e7bd48
--- /dev/null
+++ b/tests/baselines/reference/nodeModules1(module=nodenext).types
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder2/index.ts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder2/another/index.ts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
diff --git a/tests/baselines/reference/nodeModulesDynamicImport(module=node12).js b/tests/baselines/reference/nodeModulesDynamicImport(module=node12).js
new file mode 100644
index 0000000000000..71f2979b2146e
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesDynamicImport(module=node12).js
@@ -0,0 +1,39 @@
+//// [tests/cases/conformance/node/nodeModulesDynamicImport.ts] ////
+
+//// [index.ts]
+// cjs format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+//// [index.ts]
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.main = void 0;
+// cjs format file
+async function main() {
+    const { readFile } = await import("fs");
+}
+exports.main = main;
+//// [index.js]
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
diff --git a/tests/baselines/reference/nodeModulesDynamicImport(module=node12).symbols b/tests/baselines/reference/nodeModulesDynamicImport(module=node12).symbols
new file mode 100644
index 0000000000000..69296bc3fa993
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesDynamicImport(module=node12).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export async function main() {
+>main : Symbol(main, Decl(index.ts, 0, 0))
+
+    const { readFile } = await import("fs");
+>readFile : Symbol(readFile, Decl(index.ts, 2, 11))
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+}
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export async function main() {
+>main : Symbol(main, Decl(index.ts, 0, 0))
+
+    const { readFile } = await import("fs");
+>readFile : Symbol(readFile, Decl(index.ts, 2, 11))
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+}
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
diff --git a/tests/baselines/reference/nodeModulesDynamicImport(module=node12).types b/tests/baselines/reference/nodeModulesDynamicImport(module=node12).types
new file mode 100644
index 0000000000000..879fb7ca71bf8
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesDynamicImport(module=node12).types
@@ -0,0 +1,26 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export async function main() {
+>main : () => Promise<void>
+
+    const { readFile } = await import("fs");
+>readFile : any
+>await import("fs") : any
+>import("fs") : Promise<any>
+>"fs" : "fs"
+}
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export async function main() {
+>main : () => Promise<void>
+
+    const { readFile } = await import("fs");
+>readFile : any
+>await import("fs") : any
+>import("fs") : Promise<any>
+>"fs" : "fs"
+}
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
diff --git a/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).js b/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).js
new file mode 100644
index 0000000000000..71f2979b2146e
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).js
@@ -0,0 +1,39 @@
+//// [tests/cases/conformance/node/nodeModulesDynamicImport.ts] ////
+
+//// [index.ts]
+// cjs format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+//// [index.ts]
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.main = void 0;
+// cjs format file
+async function main() {
+    const { readFile } = await import("fs");
+}
+exports.main = main;
+//// [index.js]
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
diff --git a/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).symbols b/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).symbols
new file mode 100644
index 0000000000000..69296bc3fa993
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export async function main() {
+>main : Symbol(main, Decl(index.ts, 0, 0))
+
+    const { readFile } = await import("fs");
+>readFile : Symbol(readFile, Decl(index.ts, 2, 11))
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+}
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export async function main() {
+>main : Symbol(main, Decl(index.ts, 0, 0))
+
+    const { readFile } = await import("fs");
+>readFile : Symbol(readFile, Decl(index.ts, 2, 11))
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+}
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
diff --git a/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).types b/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).types
new file mode 100644
index 0000000000000..879fb7ca71bf8
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).types
@@ -0,0 +1,26 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export async function main() {
+>main : () => Promise<void>
+
+    const { readFile } = await import("fs");
+>readFile : any
+>await import("fs") : any
+>import("fs") : Promise<any>
+>"fs" : "fs"
+}
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export async function main() {
+>main : () => Promise<void>
+
+    const { readFile } = await import("fs");
+>readFile : any
+>await import("fs") : any
+>import("fs") : Promise<any>
+>"fs" : "fs"
+}
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=node12).errors.txt b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).errors.txt
new file mode 100644
index 0000000000000..cef2966380663
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).errors.txt
@@ -0,0 +1,23 @@
+tests/cases/conformance/node/index.ts(3,1): error TS1203: Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
+    // cjs format file
+    const a = {};
+    export = a;
+==== tests/cases/conformance/node/index.ts (1 errors) ====
+    // esm format file
+    const a = {};
+    export = a;
+    ~~~~~~~~~~~
+!!! error TS1203: Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead.
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=node12).js b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).js
new file mode 100644
index 0000000000000..687d129e52e4e
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).js
@@ -0,0 +1,30 @@
+//// [tests/cases/conformance/node/nodeModulesExportAssignments.ts] ////
+
+//// [index.ts]
+// cjs format file
+const a = {};
+export = a;
+//// [index.ts]
+// esm format file
+const a = {};
+export = a;
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+// cjs format file
+const a = {};
+module.exports = a;
+//// [index.js]
+// esm format file
+const a = {};
+export {};
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=node12).symbols b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).symbols
new file mode 100644
index 0000000000000..4552dd34157ab
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).symbols
@@ -0,0 +1,16 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const a = {};
+>a : Symbol(a, Decl(index.ts, 1, 5))
+
+export = a;
+>a : Symbol(a, Decl(index.ts, 1, 5))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const a = {};
+>a : Symbol(a, Decl(index.ts, 1, 5))
+
+export = a;
+>a : Symbol(a, Decl(index.ts, 1, 5))
+
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=node12).types b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).types
new file mode 100644
index 0000000000000..73f7e0869eba3
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).types
@@ -0,0 +1,18 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const a = {};
+>a : {}
+>{} : {}
+
+export = a;
+>a : {}
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const a = {};
+>a : {}
+>{} : {}
+
+export = a;
+>a : {}
+
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..cef2966380663
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).errors.txt
@@ -0,0 +1,23 @@
+tests/cases/conformance/node/index.ts(3,1): error TS1203: Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
+    // cjs format file
+    const a = {};
+    export = a;
+==== tests/cases/conformance/node/index.ts (1 errors) ====
+    // esm format file
+    const a = {};
+    export = a;
+    ~~~~~~~~~~~
+!!! error TS1203: Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead.
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).js b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).js
new file mode 100644
index 0000000000000..687d129e52e4e
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).js
@@ -0,0 +1,30 @@
+//// [tests/cases/conformance/node/nodeModulesExportAssignments.ts] ////
+
+//// [index.ts]
+// cjs format file
+const a = {};
+export = a;
+//// [index.ts]
+// esm format file
+const a = {};
+export = a;
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+// cjs format file
+const a = {};
+module.exports = a;
+//// [index.js]
+// esm format file
+const a = {};
+export {};
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).symbols b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).symbols
new file mode 100644
index 0000000000000..4552dd34157ab
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).symbols
@@ -0,0 +1,16 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const a = {};
+>a : Symbol(a, Decl(index.ts, 1, 5))
+
+export = a;
+>a : Symbol(a, Decl(index.ts, 1, 5))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const a = {};
+>a : Symbol(a, Decl(index.ts, 1, 5))
+
+export = a;
+>a : Symbol(a, Decl(index.ts, 1, 5))
+
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).types b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).types
new file mode 100644
index 0000000000000..73f7e0869eba3
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).types
@@ -0,0 +1,18 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const a = {};
+>a : {}
+>{} : {}
+
+export = a;
+>a : {}
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const a = {};
+>a : {}
+>{} : {}
+
+export = a;
+>a : {}
+
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).errors.txt b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).errors.txt
new file mode 100644
index 0000000000000..bcf0d1d592ca8
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).errors.txt
@@ -0,0 +1,38 @@
+tests/cases/conformance/node/subfolder/index.ts(2,10): error TS2441: Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of a module.
+tests/cases/conformance/node/subfolder/index.ts(3,7): error TS2441: Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of a module.
+tests/cases/conformance/node/subfolder/index.ts(4,7): error TS2725: Class name cannot be 'Object' when targeting ES5 with module Node12.
+tests/cases/conformance/node/subfolder/index.ts(5,14): error TS1216: Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (4 errors) ====
+    // cjs format file
+    function require() {}
+             ~~~~~~~
+!!! error TS2441: Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of a module.
+    const exports = {};
+          ~~~~~~~
+!!! error TS2441: Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of a module.
+    class Object {}
+          ~~~~~~
+!!! error TS2725: Class name cannot be 'Object' when targeting ES5 with module Node12.
+    export const __esModule = false;
+                 ~~~~~~~~~~
+!!! error TS1216: Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules.
+    export {require, exports, Object};
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    function require() {}
+    const exports = {};
+    class Object {}
+    export const __esModule = false;
+    export {require, exports, Object};
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).js b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).js
new file mode 100644
index 0000000000000..cc5f8296acfc8
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).js
@@ -0,0 +1,48 @@
+//// [tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts] ////
+
+//// [index.ts]
+// cjs format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+//// [index.ts]
+// esm format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Object = exports.exports = exports.require = exports.__esModule = void 0;
+// cjs format file
+function require() { }
+exports.require = require;
+const exports = {};
+exports.exports = exports;
+class Object {
+}
+exports.Object = Object;
+exports.__esModule = false;
+//// [index.js]
+// esm format file
+function require() { }
+const exports = {};
+class Object {
+}
+export const __esModule = false;
+export { require, exports, Object };
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).symbols b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).symbols
new file mode 100644
index 0000000000000..9e967fe93b7a4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).symbols
@@ -0,0 +1,38 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+function require() {}
+>require : Symbol(require, Decl(index.ts, 0, 0))
+
+const exports = {};
+>exports : Symbol(exports, Decl(index.ts, 2, 5))
+
+class Object {}
+>Object : Symbol(Object, Decl(index.ts, 2, 19))
+
+export const __esModule = false;
+>__esModule : Symbol(__esModule, Decl(index.ts, 4, 12))
+
+export {require, exports, Object};
+>require : Symbol(require, Decl(index.ts, 5, 8))
+>exports : Symbol(exports, Decl(index.ts, 5, 16))
+>Object : Symbol(Object, Decl(index.ts, 5, 25))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+function require() {}
+>require : Symbol(require, Decl(index.ts, 0, 0))
+
+const exports = {};
+>exports : Symbol(exports, Decl(index.ts, 2, 5))
+
+class Object {}
+>Object : Symbol(Object, Decl(index.ts, 2, 19))
+
+export const __esModule = false;
+>__esModule : Symbol(__esModule, Decl(index.ts, 4, 12))
+
+export {require, exports, Object};
+>require : Symbol(require, Decl(index.ts, 5, 8))
+>exports : Symbol(exports, Decl(index.ts, 5, 16))
+>Object : Symbol(Object, Decl(index.ts, 5, 25))
+
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).types b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).types
new file mode 100644
index 0000000000000..094de6c869242
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).types
@@ -0,0 +1,42 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+function require() {}
+>require : () => void
+
+const exports = {};
+>exports : {}
+>{} : {}
+
+class Object {}
+>Object : Object
+
+export const __esModule = false;
+>__esModule : false
+>false : false
+
+export {require, exports, Object};
+>require : () => void
+>exports : {}
+>Object : typeof Object
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+function require() {}
+>require : () => void
+
+const exports = {};
+>exports : {}
+>{} : {}
+
+class Object {}
+>Object : Object
+
+export const __esModule = false;
+>__esModule : false
+>false : false
+
+export {require, exports, Object};
+>require : () => void
+>exports : {}
+>Object : typeof Object
+
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..abc62c363a23c
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).errors.txt
@@ -0,0 +1,38 @@
+tests/cases/conformance/node/subfolder/index.ts(2,10): error TS2441: Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of a module.
+tests/cases/conformance/node/subfolder/index.ts(3,7): error TS2441: Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of a module.
+tests/cases/conformance/node/subfolder/index.ts(4,7): error TS2725: Class name cannot be 'Object' when targeting ES5 with module NodeNext.
+tests/cases/conformance/node/subfolder/index.ts(5,14): error TS1216: Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (4 errors) ====
+    // cjs format file
+    function require() {}
+             ~~~~~~~
+!!! error TS2441: Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of a module.
+    const exports = {};
+          ~~~~~~~
+!!! error TS2441: Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of a module.
+    class Object {}
+          ~~~~~~
+!!! error TS2725: Class name cannot be 'Object' when targeting ES5 with module NodeNext.
+    export const __esModule = false;
+                 ~~~~~~~~~~
+!!! error TS1216: Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules.
+    export {require, exports, Object};
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    function require() {}
+    const exports = {};
+    class Object {}
+    export const __esModule = false;
+    export {require, exports, Object};
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).js b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).js
new file mode 100644
index 0000000000000..cc5f8296acfc8
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).js
@@ -0,0 +1,48 @@
+//// [tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts] ////
+
+//// [index.ts]
+// cjs format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+//// [index.ts]
+// esm format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Object = exports.exports = exports.require = exports.__esModule = void 0;
+// cjs format file
+function require() { }
+exports.require = require;
+const exports = {};
+exports.exports = exports;
+class Object {
+}
+exports.Object = Object;
+exports.__esModule = false;
+//// [index.js]
+// esm format file
+function require() { }
+const exports = {};
+class Object {
+}
+export const __esModule = false;
+export { require, exports, Object };
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).symbols b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).symbols
new file mode 100644
index 0000000000000..9e967fe93b7a4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).symbols
@@ -0,0 +1,38 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+function require() {}
+>require : Symbol(require, Decl(index.ts, 0, 0))
+
+const exports = {};
+>exports : Symbol(exports, Decl(index.ts, 2, 5))
+
+class Object {}
+>Object : Symbol(Object, Decl(index.ts, 2, 19))
+
+export const __esModule = false;
+>__esModule : Symbol(__esModule, Decl(index.ts, 4, 12))
+
+export {require, exports, Object};
+>require : Symbol(require, Decl(index.ts, 5, 8))
+>exports : Symbol(exports, Decl(index.ts, 5, 16))
+>Object : Symbol(Object, Decl(index.ts, 5, 25))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+function require() {}
+>require : Symbol(require, Decl(index.ts, 0, 0))
+
+const exports = {};
+>exports : Symbol(exports, Decl(index.ts, 2, 5))
+
+class Object {}
+>Object : Symbol(Object, Decl(index.ts, 2, 19))
+
+export const __esModule = false;
+>__esModule : Symbol(__esModule, Decl(index.ts, 4, 12))
+
+export {require, exports, Object};
+>require : Symbol(require, Decl(index.ts, 5, 8))
+>exports : Symbol(exports, Decl(index.ts, 5, 16))
+>Object : Symbol(Object, Decl(index.ts, 5, 25))
+
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).types b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).types
new file mode 100644
index 0000000000000..094de6c869242
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).types
@@ -0,0 +1,42 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+function require() {}
+>require : () => void
+
+const exports = {};
+>exports : {}
+>{} : {}
+
+class Object {}
+>Object : Object
+
+export const __esModule = false;
+>__esModule : false
+>false : false
+
+export {require, exports, Object};
+>require : () => void
+>exports : {}
+>Object : typeof Object
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+function require() {}
+>require : () => void
+
+const exports = {};
+>exports : {}
+>{} : {}
+
+class Object {}
+>Object : Object
+
+export const __esModule = false;
+>__esModule : false
+>false : false
+
+export {require, exports, Object};
+>require : () => void
+>exports : {}
+>Object : typeof Object
+
diff --git a/tests/baselines/reference/nodeModulesImportAssignments(module=node12).js b/tests/baselines/reference/nodeModulesImportAssignments(module=node12).js
new file mode 100644
index 0000000000000..509c046355ebe
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportAssignments(module=node12).js
@@ -0,0 +1,57 @@
+//// [tests/cases/conformance/node/nodeModulesImportAssignments.ts] ////
+
+//// [index.ts]
+// cjs format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [index.ts]
+// esm format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [file.ts]
+// esm format file
+const __require = null;
+const _createRequire = null;
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+// cjs format file
+const fs = require("fs");
+fs.readFile;
+exports.fs2 = require("fs");
+//// [index.js]
+import { createRequire as _createRequire } from "module";
+const __require = _createRequire(import.meta.url);
+// esm format file
+const fs = __require("fs");
+fs.readFile;
+const fs2 = __require("fs");
+export { fs2 };
+//// [file.js]
+import { createRequire as _createRequire_1 } from "module";
+const __require_1 = _createRequire_1(import.meta.url);
+// esm format file
+const __require = null;
+const _createRequire = null;
+const fs = __require_1("fs");
+fs.readFile;
+const fs2 = __require_1("fs");
+export { fs2 };
diff --git a/tests/baselines/reference/nodeModulesImportAssignments(module=node12).symbols b/tests/baselines/reference/nodeModulesImportAssignments(module=node12).symbols
new file mode 100644
index 0000000000000..ae7fbc666da4c
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportAssignments(module=node12).symbols
@@ -0,0 +1,43 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import fs = require("fs");
+>fs : Symbol(fs, Decl(index.ts, 0, 0))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.ts, 0, 0))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(index.ts, 2, 12))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import fs = require("fs");
+>fs : Symbol(fs, Decl(index.ts, 0, 0))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.ts, 0, 0))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(index.ts, 2, 12))
+
+=== tests/cases/conformance/node/file.ts ===
+// esm format file
+const __require = null;
+>__require : Symbol(__require, Decl(file.ts, 1, 5))
+
+const _createRequire = null;
+>_createRequire : Symbol(_createRequire, Decl(file.ts, 2, 5))
+
+import fs = require("fs");
+>fs : Symbol(fs, Decl(file.ts, 2, 28))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(file.ts, 2, 28))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(file.ts, 4, 12))
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
diff --git a/tests/baselines/reference/nodeModulesImportAssignments(module=node12).types b/tests/baselines/reference/nodeModulesImportAssignments(module=node12).types
new file mode 100644
index 0000000000000..21af2cd798f58
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportAssignments(module=node12).types
@@ -0,0 +1,51 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/file.ts ===
+// esm format file
+const __require = null;
+>__require : any
+>null : null
+
+const _createRequire = null;
+>_createRequire : any
+>null : null
+
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
diff --git a/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).js b/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).js
new file mode 100644
index 0000000000000..509c046355ebe
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).js
@@ -0,0 +1,57 @@
+//// [tests/cases/conformance/node/nodeModulesImportAssignments.ts] ////
+
+//// [index.ts]
+// cjs format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [index.ts]
+// esm format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [file.ts]
+// esm format file
+const __require = null;
+const _createRequire = null;
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+// cjs format file
+const fs = require("fs");
+fs.readFile;
+exports.fs2 = require("fs");
+//// [index.js]
+import { createRequire as _createRequire } from "module";
+const __require = _createRequire(import.meta.url);
+// esm format file
+const fs = __require("fs");
+fs.readFile;
+const fs2 = __require("fs");
+export { fs2 };
+//// [file.js]
+import { createRequire as _createRequire_1 } from "module";
+const __require_1 = _createRequire_1(import.meta.url);
+// esm format file
+const __require = null;
+const _createRequire = null;
+const fs = __require_1("fs");
+fs.readFile;
+const fs2 = __require_1("fs");
+export { fs2 };
diff --git a/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).symbols b/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).symbols
new file mode 100644
index 0000000000000..ae7fbc666da4c
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).symbols
@@ -0,0 +1,43 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import fs = require("fs");
+>fs : Symbol(fs, Decl(index.ts, 0, 0))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.ts, 0, 0))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(index.ts, 2, 12))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import fs = require("fs");
+>fs : Symbol(fs, Decl(index.ts, 0, 0))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.ts, 0, 0))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(index.ts, 2, 12))
+
+=== tests/cases/conformance/node/file.ts ===
+// esm format file
+const __require = null;
+>__require : Symbol(__require, Decl(file.ts, 1, 5))
+
+const _createRequire = null;
+>_createRequire : Symbol(_createRequire, Decl(file.ts, 2, 5))
+
+import fs = require("fs");
+>fs : Symbol(fs, Decl(file.ts, 2, 28))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(file.ts, 2, 28))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(file.ts, 4, 12))
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
diff --git a/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).types b/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).types
new file mode 100644
index 0000000000000..21af2cd798f58
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).types
@@ -0,0 +1,51 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/file.ts ===
+// esm format file
+const __require = null;
+>__require : any
+>null : null
+
+const _createRequire = null;
+>_createRequire : any
+>null : null
+
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).errors.txt b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).errors.txt
new file mode 100644
index 0000000000000..b4ae0ff6fb045
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).errors.txt
@@ -0,0 +1,36 @@
+tests/cases/conformance/node/subfolder/index.ts(2,9): error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+tests/cases/conformance/node/subfolder/index.ts(4,1): error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    import {default as _fs} from "fs";
+            ~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    _fs.readFile;
+    import * as fs from "fs";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    fs.readFile;
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    import {default as _fs} from "fs";
+    _fs.readFile;
+    import * as fs from "fs";
+    fs.readFile;
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).js
new file mode 100644
index 0000000000000..7e7ddefb4008e
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).js
@@ -0,0 +1,46 @@
+//// [tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts] ////
+
+//// [index.ts]
+// cjs format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+//// [index.ts]
+// esm format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const tslib_1 = require("tslib");
+// cjs format file
+const fs_1 = (0, tslib_1.__importDefault)(require("fs"));
+fs_1.default.readFile;
+const fs = (0, tslib_1.__importStar)(require("fs"));
+fs.readFile;
+//// [index.js]
+// esm format file
+import { default as _fs } from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).symbols b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).symbols
new file mode 100644
index 0000000000000..996840abd4e8b
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).symbols
@@ -0,0 +1,40 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import {default as _fs} from "fs";
+>default : Symbol(_fs, Decl(types.d.ts, 0, 0))
+>_fs : Symbol(_fs, Decl(index.ts, 1, 8))
+
+_fs.readFile;
+>_fs : Symbol(_fs, Decl(index.ts, 1, 8))
+
+import * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 3, 6))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.ts, 3, 6))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import {default as _fs} from "fs";
+>default : Symbol(_fs, Decl(types.d.ts, 0, 0))
+>_fs : Symbol(_fs, Decl(index.ts, 1, 8))
+
+_fs.readFile;
+>_fs : Symbol(_fs, Decl(index.ts, 1, 8))
+
+import * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 3, 6))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.ts, 3, 6))
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).types b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).types
new file mode 100644
index 0000000000000..e08e9456be9a5
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).types
@@ -0,0 +1,48 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import {default as _fs} from "fs";
+>default : any
+>_fs : any
+
+_fs.readFile;
+>_fs.readFile : any
+>_fs : any
+>readFile : any
+
+import * as fs from "fs";
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import {default as _fs} from "fs";
+>default : any
+>_fs : any
+
+_fs.readFile;
+>_fs.readFile : any
+>_fs : any
+>readFile : any
+
+import * as fs from "fs";
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..b4ae0ff6fb045
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).errors.txt
@@ -0,0 +1,36 @@
+tests/cases/conformance/node/subfolder/index.ts(2,9): error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+tests/cases/conformance/node/subfolder/index.ts(4,1): error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    import {default as _fs} from "fs";
+            ~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    _fs.readFile;
+    import * as fs from "fs";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    fs.readFile;
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    import {default as _fs} from "fs";
+    _fs.readFile;
+    import * as fs from "fs";
+    fs.readFile;
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).js
new file mode 100644
index 0000000000000..7e7ddefb4008e
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).js
@@ -0,0 +1,46 @@
+//// [tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts] ////
+
+//// [index.ts]
+// cjs format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+//// [index.ts]
+// esm format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const tslib_1 = require("tslib");
+// cjs format file
+const fs_1 = (0, tslib_1.__importDefault)(require("fs"));
+fs_1.default.readFile;
+const fs = (0, tslib_1.__importStar)(require("fs"));
+fs.readFile;
+//// [index.js]
+// esm format file
+import { default as _fs } from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).symbols b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).symbols
new file mode 100644
index 0000000000000..996840abd4e8b
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).symbols
@@ -0,0 +1,40 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import {default as _fs} from "fs";
+>default : Symbol(_fs, Decl(types.d.ts, 0, 0))
+>_fs : Symbol(_fs, Decl(index.ts, 1, 8))
+
+_fs.readFile;
+>_fs : Symbol(_fs, Decl(index.ts, 1, 8))
+
+import * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 3, 6))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.ts, 3, 6))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import {default as _fs} from "fs";
+>default : Symbol(_fs, Decl(types.d.ts, 0, 0))
+>_fs : Symbol(_fs, Decl(index.ts, 1, 8))
+
+_fs.readFile;
+>_fs : Symbol(_fs, Decl(index.ts, 1, 8))
+
+import * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 3, 6))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.ts, 3, 6))
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).types b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).types
new file mode 100644
index 0000000000000..e08e9456be9a5
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).types
@@ -0,0 +1,48 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import {default as _fs} from "fs";
+>default : any
+>_fs : any
+
+_fs.readFile;
+>_fs.readFile : any
+>_fs : any
+>readFile : any
+
+import * as fs from "fs";
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import {default as _fs} from "fs";
+>default : any
+>_fs : any
+
+_fs.readFile;
+>_fs.readFile : any
+>_fs : any
+>readFile : any
+
+import * as fs from "fs";
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).errors.txt b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).errors.txt
new file mode 100644
index 0000000000000..d2f62391af269
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).errors.txt
@@ -0,0 +1,32 @@
+tests/cases/conformance/node/subfolder/index.ts(2,1): error TS2343: This syntax requires an imported helper named '__exportStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+tests/cases/conformance/node/subfolder/index.ts(3,1): error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    export * from "fs";
+    ~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__exportStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    export * as fs from "fs";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    export * from "fs";
+    export * as fs from "fs";
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).js
new file mode 100644
index 0000000000000..0ba480d137160
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).js
@@ -0,0 +1,39 @@
+//// [tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts] ////
+
+//// [index.ts]
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+//// [index.ts]
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.fs = void 0;
+const tslib_1 = require("tslib");
+// cjs format file
+(0, tslib_1.__exportStar)(require("fs"), exports);
+exports.fs = (0, tslib_1.__importStar)(require("fs"));
+//// [index.js]
+// esm format file
+export * from "fs";
+export * as fs from "fs";
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).symbols b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).symbols
new file mode 100644
index 0000000000000..367ba59adf00f
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 2, 6))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 2, 6))
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).types b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).types
new file mode 100644
index 0000000000000..6a468baefa7d1
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).types
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+>fs : any
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+>fs : any
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..d2f62391af269
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).errors.txt
@@ -0,0 +1,32 @@
+tests/cases/conformance/node/subfolder/index.ts(2,1): error TS2343: This syntax requires an imported helper named '__exportStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+tests/cases/conformance/node/subfolder/index.ts(3,1): error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    export * from "fs";
+    ~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__exportStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    export * as fs from "fs";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    export * from "fs";
+    export * as fs from "fs";
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).js
new file mode 100644
index 0000000000000..0ba480d137160
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).js
@@ -0,0 +1,39 @@
+//// [tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts] ////
+
+//// [index.ts]
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+//// [index.ts]
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.fs = void 0;
+const tslib_1 = require("tslib");
+// cjs format file
+(0, tslib_1.__exportStar)(require("fs"), exports);
+exports.fs = (0, tslib_1.__importStar)(require("fs"));
+//// [index.js]
+// esm format file
+export * from "fs";
+export * as fs from "fs";
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).symbols b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).symbols
new file mode 100644
index 0000000000000..367ba59adf00f
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 2, 6))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 2, 6))
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).types b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).types
new file mode 100644
index 0000000000000..6a468baefa7d1
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).types
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+>fs : any
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+>fs : any
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).errors.txt b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).errors.txt
new file mode 100644
index 0000000000000..d511944f39332
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).errors.txt
@@ -0,0 +1,27 @@
+tests/cases/conformance/node/subfolder/index.ts(2,9): error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (1 errors) ====
+    // cjs format file
+    export {default} from "fs";
+            ~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    export {default} from "fs";
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).js
new file mode 100644
index 0000000000000..b541d7253fb3d
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).js
@@ -0,0 +1,38 @@
+//// [tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts] ////
+
+//// [index.ts]
+// cjs format file
+export {default} from "fs";
+//// [index.ts]
+// esm format file
+export {default} from "fs";
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.default = void 0;
+// cjs format file
+var fs_1 = require("fs");
+Object.defineProperty(exports, "default", { enumerable: true, get: function () { return __importDefault(fs_1).default; } });
+//// [index.js]
+// esm format file
+export { default } from "fs";
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).symbols b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).symbols
new file mode 100644
index 0000000000000..aec1d32dab1d4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).symbols
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export {default} from "fs";
+>default : Symbol(default, Decl(index.ts, 1, 8))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export {default} from "fs";
+>default : Symbol(default, Decl(index.ts, 1, 8))
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).types b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).types
new file mode 100644
index 0000000000000..eef93356ac7bc
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).types
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export {default} from "fs";
+>default : any
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export {default} from "fs";
+>default : any
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..d511944f39332
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).errors.txt
@@ -0,0 +1,27 @@
+tests/cases/conformance/node/subfolder/index.ts(2,9): error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (1 errors) ====
+    // cjs format file
+    export {default} from "fs";
+            ~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    export {default} from "fs";
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).js
new file mode 100644
index 0000000000000..b541d7253fb3d
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).js
@@ -0,0 +1,38 @@
+//// [tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts] ////
+
+//// [index.ts]
+// cjs format file
+export {default} from "fs";
+//// [index.ts]
+// esm format file
+export {default} from "fs";
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.default = void 0;
+// cjs format file
+var fs_1 = require("fs");
+Object.defineProperty(exports, "default", { enumerable: true, get: function () { return __importDefault(fs_1).default; } });
+//// [index.js]
+// esm format file
+export { default } from "fs";
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).symbols b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).symbols
new file mode 100644
index 0000000000000..aec1d32dab1d4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).symbols
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export {default} from "fs";
+>default : Symbol(default, Decl(index.ts, 1, 8))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export {default} from "fs";
+>default : Symbol(default, Decl(index.ts, 1, 8))
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).types b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).types
new file mode 100644
index 0000000000000..eef93356ac7bc
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).types
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+export {default} from "fs";
+>default : any
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+export {default} from "fs";
+>default : any
+
+=== tests/cases/conformance/node/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=node12).errors.txt b/tests/baselines/reference/nodeModulesImportMeta(module=node12).errors.txt
new file mode 100644
index 0000000000000..3a7d1f4399ab7
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=node12).errors.txt
@@ -0,0 +1,23 @@
+tests/cases/conformance/node/subfolder/index.ts(2,11): error TS1434: The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (1 errors) ====
+    // cjs format file
+    const x = import.meta.url;
+              ~~~~~~~~~~~
+!!! error TS1434: The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.
+    export {x};
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    const x = import.meta.url;
+    export {x};
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=node12).js b/tests/baselines/reference/nodeModulesImportMeta(module=node12).js
new file mode 100644
index 0000000000000..a236853057399
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=node12).js
@@ -0,0 +1,32 @@
+//// [tests/cases/conformance/node/nodeModulesImportMeta.ts] ////
+
+//// [index.ts]
+// cjs format file
+const x = import.meta.url;
+export {x};
+//// [index.ts]
+// esm format file
+const x = import.meta.url;
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = import.meta.url;
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = import.meta.url;
+export { x };
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=node12).symbols b/tests/baselines/reference/nodeModulesImportMeta(module=node12).symbols
new file mode 100644
index 0000000000000..4f320ebf560e0
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=node12).symbols
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = import.meta.url;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>import.meta.url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+>url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = import.meta.url;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>import.meta.url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+>url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=node12).types b/tests/baselines/reference/nodeModulesImportMeta(module=node12).types
new file mode 100644
index 0000000000000..6f64dc2b5faa6
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=node12).types
@@ -0,0 +1,24 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = import.meta.url;
+>x : string
+>import.meta.url : string
+>import.meta : ImportMeta
+>meta : any
+>url : string
+
+export {x};
+>x : string
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = import.meta.url;
+>x : string
+>import.meta.url : string
+>import.meta : ImportMeta
+>meta : any
+>url : string
+
+export {x};
+>x : string
+
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..3a7d1f4399ab7
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).errors.txt
@@ -0,0 +1,23 @@
+tests/cases/conformance/node/subfolder/index.ts(2,11): error TS1434: The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (1 errors) ====
+    // cjs format file
+    const x = import.meta.url;
+              ~~~~~~~~~~~
+!!! error TS1434: The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.
+    export {x};
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    const x = import.meta.url;
+    export {x};
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).js b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).js
new file mode 100644
index 0000000000000..a236853057399
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).js
@@ -0,0 +1,32 @@
+//// [tests/cases/conformance/node/nodeModulesImportMeta.ts] ////
+
+//// [index.ts]
+// cjs format file
+const x = import.meta.url;
+export {x};
+//// [index.ts]
+// esm format file
+const x = import.meta.url;
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = import.meta.url;
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = import.meta.url;
+export { x };
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).symbols b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).symbols
new file mode 100644
index 0000000000000..4f320ebf560e0
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).symbols
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = import.meta.url;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>import.meta.url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+>url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = import.meta.url;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>import.meta.url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+>url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).types b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).types
new file mode 100644
index 0000000000000..6f64dc2b5faa6
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).types
@@ -0,0 +1,24 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = import.meta.url;
+>x : string
+>import.meta.url : string
+>import.meta : ImportMeta
+>meta : any
+>url : string
+
+export {x};
+>x : string
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = import.meta.url;
+>x : string
+>import.meta.url : string
+>import.meta : ImportMeta
+>meta : any
+>url : string
+
+export {x};
+>x : string
+
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).errors.txt b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).errors.txt
new file mode 100644
index 0000000000000..2569b342924dc
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).errors.txt
@@ -0,0 +1,43 @@
+tests/cases/conformance/node/index.ts(3,22): error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/subfolder/index.ts(2,17): error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/subfolder/index.ts(3,22): error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    import {h} from "../index.js";
+                    ~~~~~~~~~~~~~
+!!! error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import mod = require("../index.js");
+                         ~~~~~~~~~~~~~
+!!! error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import {f as _f} from "./index.js";
+    import mod2 = require("./index.js");
+    export async function f() {
+        const mod3 = await import ("../index.js");
+        const mod4 = await import ("./index.js");
+        h();
+    }
+==== tests/cases/conformance/node/index.ts (1 errors) ====
+    // esm format file
+    import {h as _h} from "./index.js";
+    import mod = require("./index.js");
+                         ~~~~~~~~~~~~
+!!! error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import {f} from "./subfolder/index.js";
+    import mod2 = require("./subfolder/index.js");
+    export async function h() {
+        const mod3 = await import ("./index.js");
+        const mod4 = await import ("./subfolder/index.js");
+        f();
+    }
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).js b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).js
new file mode 100644
index 0000000000000..c37ce0438cba1
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).js
@@ -0,0 +1,54 @@
+//// [tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts] ////
+
+//// [index.ts]
+// cjs format file
+import {h} from "../index.js";
+import mod = require("../index.js");
+import {f as _f} from "./index.js";
+import mod2 = require("./index.js");
+export async function f() {
+    const mod3 = await import ("../index.js");
+    const mod4 = await import ("./index.js");
+    h();
+}
+//// [index.ts]
+// esm format file
+import {h as _h} from "./index.js";
+import mod = require("./index.js");
+import {f} from "./subfolder/index.js";
+import mod2 = require("./subfolder/index.js");
+export async function h() {
+    const mod3 = await import ("./index.js");
+    const mod4 = await import ("./subfolder/index.js");
+    f();
+}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+import { f } from "./subfolder/index.js";
+export async function h() {
+    const mod3 = await import("./index.js");
+    const mod4 = await import("./subfolder/index.js");
+    f();
+}
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.f = void 0;
+// cjs format file
+const index_js_1 = require("../index.js");
+async function f() {
+    const mod3 = await import("../index.js");
+    const mod4 = await import("./index.js");
+    (0, index_js_1.h)();
+}
+exports.f = f;
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).symbols b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).symbols
new file mode 100644
index 0000000000000..8b03ab0af9f41
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).symbols
@@ -0,0 +1,58 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import {h} from "../index.js";
+>h : Symbol(h, Decl(index.ts, 1, 8))
+
+import mod = require("../index.js");
+>mod : Symbol(mod, Decl(index.ts, 1, 30))
+
+import {f as _f} from "./index.js";
+>f : Symbol(f, Decl(index.ts, 4, 36))
+>_f : Symbol(_f, Decl(index.ts, 3, 8))
+
+import mod2 = require("./index.js");
+>mod2 : Symbol(mod2, Decl(index.ts, 3, 35))
+
+export async function f() {
+>f : Symbol(f, Decl(index.ts, 4, 36))
+
+    const mod3 = await import ("../index.js");
+>mod3 : Symbol(mod3, Decl(index.ts, 6, 9))
+>"../index.js" : Symbol(mod, Decl(index.ts, 0, 0))
+
+    const mod4 = await import ("./index.js");
+>mod4 : Symbol(mod4, Decl(index.ts, 7, 9))
+>"./index.js" : Symbol(mod2, Decl(index.ts, 0, 0))
+
+    h();
+>h : Symbol(h, Decl(index.ts, 1, 8))
+}
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import {h as _h} from "./index.js";
+>h : Symbol(h, Decl(index.ts, 4, 46))
+>_h : Symbol(_h, Decl(index.ts, 1, 8))
+
+import mod = require("./index.js");
+>mod : Symbol(mod, Decl(index.ts, 1, 35))
+
+import {f} from "./subfolder/index.js";
+>f : Symbol(f, Decl(index.ts, 3, 8))
+
+import mod2 = require("./subfolder/index.js");
+>mod2 : Symbol(mod2, Decl(index.ts, 3, 39))
+
+export async function h() {
+>h : Symbol(h, Decl(index.ts, 4, 46))
+
+    const mod3 = await import ("./index.js");
+>mod3 : Symbol(mod3, Decl(index.ts, 6, 9))
+>"./index.js" : Symbol(mod, Decl(index.ts, 0, 0))
+
+    const mod4 = await import ("./subfolder/index.js");
+>mod4 : Symbol(mod4, Decl(index.ts, 7, 9))
+>"./subfolder/index.js" : Symbol(mod2, Decl(index.ts, 0, 0))
+
+    f();
+>f : Symbol(f, Decl(index.ts, 3, 8))
+}
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).types b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).types
new file mode 100644
index 0000000000000..8ca6d52152161
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).types
@@ -0,0 +1,68 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import {h} from "../index.js";
+>h : () => Promise<void>
+
+import mod = require("../index.js");
+>mod : typeof mod
+
+import {f as _f} from "./index.js";
+>f : () => Promise<void>
+>_f : () => Promise<void>
+
+import mod2 = require("./index.js");
+>mod2 : typeof mod2
+
+export async function f() {
+>f : () => Promise<void>
+
+    const mod3 = await import ("../index.js");
+>mod3 : typeof mod
+>await import ("../index.js") : typeof mod
+>import ("../index.js") : Promise<typeof mod>
+>"../index.js" : "../index.js"
+
+    const mod4 = await import ("./index.js");
+>mod4 : typeof mod2
+>await import ("./index.js") : typeof mod2
+>import ("./index.js") : Promise<typeof mod2>
+>"./index.js" : "./index.js"
+
+    h();
+>h() : Promise<void>
+>h : () => Promise<void>
+}
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import {h as _h} from "./index.js";
+>h : () => Promise<void>
+>_h : () => Promise<void>
+
+import mod = require("./index.js");
+>mod : typeof mod
+
+import {f} from "./subfolder/index.js";
+>f : () => Promise<void>
+
+import mod2 = require("./subfolder/index.js");
+>mod2 : typeof mod2
+
+export async function h() {
+>h : () => Promise<void>
+
+    const mod3 = await import ("./index.js");
+>mod3 : typeof mod
+>await import ("./index.js") : typeof mod
+>import ("./index.js") : Promise<typeof mod>
+>"./index.js" : "./index.js"
+
+    const mod4 = await import ("./subfolder/index.js");
+>mod4 : typeof mod2
+>await import ("./subfolder/index.js") : typeof mod2
+>import ("./subfolder/index.js") : Promise<typeof mod2>
+>"./subfolder/index.js" : "./subfolder/index.js"
+
+    f();
+>f() : Promise<void>
+>f : () => Promise<void>
+}
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..2569b342924dc
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).errors.txt
@@ -0,0 +1,43 @@
+tests/cases/conformance/node/index.ts(3,22): error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/subfolder/index.ts(2,17): error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/subfolder/index.ts(3,22): error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    import {h} from "../index.js";
+                    ~~~~~~~~~~~~~
+!!! error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import mod = require("../index.js");
+                         ~~~~~~~~~~~~~
+!!! error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import {f as _f} from "./index.js";
+    import mod2 = require("./index.js");
+    export async function f() {
+        const mod3 = await import ("../index.js");
+        const mod4 = await import ("./index.js");
+        h();
+    }
+==== tests/cases/conformance/node/index.ts (1 errors) ====
+    // esm format file
+    import {h as _h} from "./index.js";
+    import mod = require("./index.js");
+                         ~~~~~~~~~~~~
+!!! error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import {f} from "./subfolder/index.js";
+    import mod2 = require("./subfolder/index.js");
+    export async function h() {
+        const mod3 = await import ("./index.js");
+        const mod4 = await import ("./subfolder/index.js");
+        f();
+    }
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).js b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).js
new file mode 100644
index 0000000000000..c37ce0438cba1
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).js
@@ -0,0 +1,54 @@
+//// [tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts] ////
+
+//// [index.ts]
+// cjs format file
+import {h} from "../index.js";
+import mod = require("../index.js");
+import {f as _f} from "./index.js";
+import mod2 = require("./index.js");
+export async function f() {
+    const mod3 = await import ("../index.js");
+    const mod4 = await import ("./index.js");
+    h();
+}
+//// [index.ts]
+// esm format file
+import {h as _h} from "./index.js";
+import mod = require("./index.js");
+import {f} from "./subfolder/index.js";
+import mod2 = require("./subfolder/index.js");
+export async function h() {
+    const mod3 = await import ("./index.js");
+    const mod4 = await import ("./subfolder/index.js");
+    f();
+}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+import { f } from "./subfolder/index.js";
+export async function h() {
+    const mod3 = await import("./index.js");
+    const mod4 = await import("./subfolder/index.js");
+    f();
+}
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.f = void 0;
+// cjs format file
+const index_js_1 = require("../index.js");
+async function f() {
+    const mod3 = await import("../index.js");
+    const mod4 = await import("./index.js");
+    (0, index_js_1.h)();
+}
+exports.f = f;
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).symbols b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).symbols
new file mode 100644
index 0000000000000..8b03ab0af9f41
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).symbols
@@ -0,0 +1,58 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import {h} from "../index.js";
+>h : Symbol(h, Decl(index.ts, 1, 8))
+
+import mod = require("../index.js");
+>mod : Symbol(mod, Decl(index.ts, 1, 30))
+
+import {f as _f} from "./index.js";
+>f : Symbol(f, Decl(index.ts, 4, 36))
+>_f : Symbol(_f, Decl(index.ts, 3, 8))
+
+import mod2 = require("./index.js");
+>mod2 : Symbol(mod2, Decl(index.ts, 3, 35))
+
+export async function f() {
+>f : Symbol(f, Decl(index.ts, 4, 36))
+
+    const mod3 = await import ("../index.js");
+>mod3 : Symbol(mod3, Decl(index.ts, 6, 9))
+>"../index.js" : Symbol(mod, Decl(index.ts, 0, 0))
+
+    const mod4 = await import ("./index.js");
+>mod4 : Symbol(mod4, Decl(index.ts, 7, 9))
+>"./index.js" : Symbol(mod2, Decl(index.ts, 0, 0))
+
+    h();
+>h : Symbol(h, Decl(index.ts, 1, 8))
+}
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import {h as _h} from "./index.js";
+>h : Symbol(h, Decl(index.ts, 4, 46))
+>_h : Symbol(_h, Decl(index.ts, 1, 8))
+
+import mod = require("./index.js");
+>mod : Symbol(mod, Decl(index.ts, 1, 35))
+
+import {f} from "./subfolder/index.js";
+>f : Symbol(f, Decl(index.ts, 3, 8))
+
+import mod2 = require("./subfolder/index.js");
+>mod2 : Symbol(mod2, Decl(index.ts, 3, 39))
+
+export async function h() {
+>h : Symbol(h, Decl(index.ts, 4, 46))
+
+    const mod3 = await import ("./index.js");
+>mod3 : Symbol(mod3, Decl(index.ts, 6, 9))
+>"./index.js" : Symbol(mod, Decl(index.ts, 0, 0))
+
+    const mod4 = await import ("./subfolder/index.js");
+>mod4 : Symbol(mod4, Decl(index.ts, 7, 9))
+>"./subfolder/index.js" : Symbol(mod2, Decl(index.ts, 0, 0))
+
+    f();
+>f : Symbol(f, Decl(index.ts, 3, 8))
+}
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).types b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).types
new file mode 100644
index 0000000000000..8ca6d52152161
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).types
@@ -0,0 +1,68 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+import {h} from "../index.js";
+>h : () => Promise<void>
+
+import mod = require("../index.js");
+>mod : typeof mod
+
+import {f as _f} from "./index.js";
+>f : () => Promise<void>
+>_f : () => Promise<void>
+
+import mod2 = require("./index.js");
+>mod2 : typeof mod2
+
+export async function f() {
+>f : () => Promise<void>
+
+    const mod3 = await import ("../index.js");
+>mod3 : typeof mod
+>await import ("../index.js") : typeof mod
+>import ("../index.js") : Promise<typeof mod>
+>"../index.js" : "../index.js"
+
+    const mod4 = await import ("./index.js");
+>mod4 : typeof mod2
+>await import ("./index.js") : typeof mod2
+>import ("./index.js") : Promise<typeof mod2>
+>"./index.js" : "./index.js"
+
+    h();
+>h() : Promise<void>
+>h : () => Promise<void>
+}
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+import {h as _h} from "./index.js";
+>h : () => Promise<void>
+>_h : () => Promise<void>
+
+import mod = require("./index.js");
+>mod : typeof mod
+
+import {f} from "./subfolder/index.js";
+>f : () => Promise<void>
+
+import mod2 = require("./subfolder/index.js");
+>mod2 : typeof mod2
+
+export async function h() {
+>h : () => Promise<void>
+
+    const mod3 = await import ("./index.js");
+>mod3 : typeof mod
+>await import ("./index.js") : typeof mod
+>import ("./index.js") : Promise<typeof mod>
+>"./index.js" : "./index.js"
+
+    const mod4 = await import ("./subfolder/index.js");
+>mod4 : typeof mod2
+>await import ("./subfolder/index.js") : typeof mod2
+>import ("./subfolder/index.js") : Promise<typeof mod2>
+>"./subfolder/index.js" : "./subfolder/index.js"
+
+    f();
+>f() : Promise<void>
+>f : () => Promise<void>
+}
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).errors.txt b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).errors.txt
new file mode 100644
index 0000000000000..3a02a6e3d3737
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).errors.txt
@@ -0,0 +1,34 @@
+tests/cases/conformance/node/index.ts(2,11): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/node/index.ts(4,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/node/subfolder/index.ts(2,11): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/node/subfolder/index.ts(4,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    const x = await 1;
+              ~~~~~
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+    export {x};
+    for await (const y of []) {}
+        ~~~~~
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+==== tests/cases/conformance/node/index.ts (2 errors) ====
+    // esm format file
+    const x = await 1;
+              ~~~~~
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+    export {x};
+    for await (const y of []) {}
+        ~~~~~
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).js b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).js
new file mode 100644
index 0000000000000..ee36688fe4cf3
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).js
@@ -0,0 +1,36 @@
+//// [tests/cases/conformance/node/nodeModulesTopLevelAwait.ts] ////
+
+//// [index.ts]
+// cjs format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+//// [index.ts]
+// esm format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = await 1;
+exports.x = x;
+for await (const y of []) { }
+//// [index.js]
+// esm format file
+const x = await 1;
+export { x };
+for await (const y of []) { }
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).symbols b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).symbols
new file mode 100644
index 0000000000000..624f09cb77334
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = await 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+for await (const y of []) {}
+>y : Symbol(y, Decl(index.ts, 3, 16))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = await 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+for await (const y of []) {}
+>y : Symbol(y, Decl(index.ts, 3, 16))
+
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).types b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).types
new file mode 100644
index 0000000000000..ae8108f4020a2
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).types
@@ -0,0 +1,28 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = await 1;
+>x : 1
+>await 1 : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+for await (const y of []) {}
+>y : any
+>[] : undefined[]
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = await 1;
+>x : 1
+>await 1 : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+for await (const y of []) {}
+>y : any
+>[] : undefined[]
+
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..a8fa4008492e7
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).errors.txt
@@ -0,0 +1,28 @@
+tests/cases/conformance/node/subfolder/index.ts(2,11): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/node/subfolder/index.ts(4,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    const x = await 1;
+              ~~~~~
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+    export {x};
+    for await (const y of []) {}
+        ~~~~~
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    const x = await 1;
+    export {x};
+    for await (const y of []) {}
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).js b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).js
new file mode 100644
index 0000000000000..ee36688fe4cf3
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).js
@@ -0,0 +1,36 @@
+//// [tests/cases/conformance/node/nodeModulesTopLevelAwait.ts] ////
+
+//// [index.ts]
+// cjs format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+//// [index.ts]
+// esm format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = await 1;
+exports.x = x;
+for await (const y of []) { }
+//// [index.js]
+// esm format file
+const x = await 1;
+export { x };
+for await (const y of []) { }
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).symbols b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).symbols
new file mode 100644
index 0000000000000..624f09cb77334
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = await 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+for await (const y of []) {}
+>y : Symbol(y, Decl(index.ts, 3, 16))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = await 1;
+>x : Symbol(x, Decl(index.ts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+for await (const y of []) {}
+>y : Symbol(y, Decl(index.ts, 3, 16))
+
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).types b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).types
new file mode 100644
index 0000000000000..ae8108f4020a2
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).types
@@ -0,0 +1,28 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = await 1;
+>x : 1
+>await 1 : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+for await (const y of []) {}
+>y : any
+>[] : undefined[]
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = await 1;
+>x : 1
+>await 1 : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+for await (const y of []) {}
+>y : any
+>[] : undefined[]
+
diff --git a/tests/baselines/reference/parser.forAwait.es2018.errors.txt b/tests/baselines/reference/parser.forAwait.es2018.errors.txt
index cc70ef748d0a7..5969e4b6256b1 100644
--- a/tests/baselines/reference/parser.forAwait.es2018.errors.txt
+++ b/tests/baselines/reference/parser.forAwait.es2018.errors.txt
@@ -8,10 +8,10 @@ tests/cases/conformance/parser/ecmascript2018/forAwait/inFunctionDeclWithExprIsE
 tests/cases/conformance/parser/ecmascript2018/forAwait/inGeneratorWithDeclIsError.ts(3,9): error TS1103: 'for await' loops are only allowed within async functions and at the top levels of modules.
 tests/cases/conformance/parser/ecmascript2018/forAwait/inGeneratorWithExprIsError.ts(3,9): error TS1103: 'for await' loops are only allowed within async functions and at the top levels of modules.
 tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithDeclIsError.ts(1,5): error TS1431: 'for await' loops are only allowed at the top level of a file when that file is a module, but this file has no imports or exports. Consider adding an empty 'export {}' to make this file a module.
-tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithDeclIsError.ts(1,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithDeclIsError.ts(1,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
 tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithDeclIsError.ts(1,23): error TS2304: Cannot find name 'y'.
 tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithExprIsError.ts(1,5): error TS1431: 'for await' loops are only allowed at the top level of a file when that file is a module, but this file has no imports or exports. Consider adding an empty 'export {}' to make this file a module.
-tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithExprIsError.ts(1,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithExprIsError.ts(1,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
 tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithExprIsError.ts(1,12): error TS2304: Cannot find name 'x'.
 tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithExprIsError.ts(1,17): error TS2304: Cannot find name 'y'.
 
@@ -21,7 +21,7 @@ tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithExprIsError.t
         ~~~~~
 !!! error TS1431: 'for await' loops are only allowed at the top level of a file when that file is a module, but this file has no imports or exports. Consider adding an empty 'export {}' to make this file a module.
         ~~~~~
-!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
                           ~
 !!! error TS2304: Cannot find name 'y'.
     }
@@ -30,7 +30,7 @@ tests/cases/conformance/parser/ecmascript2018/forAwait/topLevelWithExprIsError.t
         ~~~~~
 !!! error TS1431: 'for await' loops are only allowed at the top level of a file when that file is a module, but this file has no imports or exports. Consider adding an empty 'export {}' to make this file a module.
         ~~~~~
-!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
                ~
 !!! error TS2304: Cannot find name 'x'.
                     ~
diff --git a/tests/baselines/reference/topLevelAwait.1(module=esnext,target=es2015).errors.txt b/tests/baselines/reference/topLevelAwait.1(module=esnext,target=es2015).errors.txt
index aeea7ac641fa2..1c4b9b820b7ed 100644
--- a/tests/baselines/reference/topLevelAwait.1(module=esnext,target=es2015).errors.txt
+++ b/tests/baselines/reference/topLevelAwait.1(module=esnext,target=es2015).errors.txt
@@ -1,13 +1,13 @@
-tests/cases/conformance/externalModules/index.ts(2,1): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
-tests/cases/conformance/externalModules/index.ts(46,3): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
-tests/cases/conformance/externalModules/other.ts(9,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/externalModules/index.ts(2,1): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/externalModules/index.ts(46,3): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/externalModules/other.ts(9,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
 
 
 ==== tests/cases/conformance/externalModules/index.ts (2 errors) ====
     export const x = 1;
     await x;
     ~~~~~
-!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
     
     // reparse element access as await
     await [x];
@@ -53,7 +53,7 @@ tests/cases/conformance/externalModules/other.ts(9,5): error TS1432: Top-level '
     declare const dec: any;
     @(await dec)
       ~~~~~
-!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
     class C {
     }
     
@@ -84,7 +84,7 @@ tests/cases/conformance/externalModules/other.ts(9,5): error TS1432: Top-level '
     
     for await (const item of arr) {
         ~~~~~
-!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
       item;
     }
     
\ No newline at end of file
diff --git a/tests/baselines/reference/topLevelAwait.1(module=system,target=es2015).errors.txt b/tests/baselines/reference/topLevelAwait.1(module=system,target=es2015).errors.txt
index aeea7ac641fa2..1c4b9b820b7ed 100644
--- a/tests/baselines/reference/topLevelAwait.1(module=system,target=es2015).errors.txt
+++ b/tests/baselines/reference/topLevelAwait.1(module=system,target=es2015).errors.txt
@@ -1,13 +1,13 @@
-tests/cases/conformance/externalModules/index.ts(2,1): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
-tests/cases/conformance/externalModules/index.ts(46,3): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
-tests/cases/conformance/externalModules/other.ts(9,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/externalModules/index.ts(2,1): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/externalModules/index.ts(46,3): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/externalModules/other.ts(9,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
 
 
 ==== tests/cases/conformance/externalModules/index.ts (2 errors) ====
     export const x = 1;
     await x;
     ~~~~~
-!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
     
     // reparse element access as await
     await [x];
@@ -53,7 +53,7 @@ tests/cases/conformance/externalModules/other.ts(9,5): error TS1432: Top-level '
     declare const dec: any;
     @(await dec)
       ~~~~~
-!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
     class C {
     }
     
@@ -84,7 +84,7 @@ tests/cases/conformance/externalModules/other.ts(9,5): error TS1432: Top-level '
     
     for await (const item of arr) {
         ~~~~~
-!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext' or 'system', and the 'target' option is set to 'es2017' or higher.
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
       item;
     }
     
\ No newline at end of file
diff --git a/tests/baselines/reference/transpile/Report an error when compiler-options module-kind is out-of-range.errors.txt b/tests/baselines/reference/transpile/Report an error when compiler-options module-kind is out-of-range.errors.txt
index 812f55c9be313..f4a6f8d147e63 100644
--- a/tests/baselines/reference/transpile/Report an error when compiler-options module-kind is out-of-range.errors.txt	
+++ b/tests/baselines/reference/transpile/Report an error when compiler-options module-kind is out-of-range.errors.txt	
@@ -1,6 +1,6 @@
-error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext'.
+error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext', 'node12', 'nodenext'.
 
 
-!!! error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext'.
+!!! error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext', 'node12', 'nodenext'.
 ==== file.ts (0 errors) ====
     
\ No newline at end of file
diff --git a/tests/baselines/reference/transpile/Report an error when compiler-options module-kind is out-of-range.oldTranspile.errors.txt b/tests/baselines/reference/transpile/Report an error when compiler-options module-kind is out-of-range.oldTranspile.errors.txt
index 812f55c9be313..f4a6f8d147e63 100644
--- a/tests/baselines/reference/transpile/Report an error when compiler-options module-kind is out-of-range.oldTranspile.errors.txt	
+++ b/tests/baselines/reference/transpile/Report an error when compiler-options module-kind is out-of-range.oldTranspile.errors.txt	
@@ -1,6 +1,6 @@
-error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext'.
+error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext', 'node12', 'nodenext'.
 
 
-!!! error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext'.
+!!! error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext', 'node12', 'nodenext'.
 ==== file.ts (0 errors) ====
     
\ No newline at end of file
diff --git a/tests/baselines/reference/transpile/Report an error when compiler-options target-script is out-of-range.errors.txt b/tests/baselines/reference/transpile/Report an error when compiler-options target-script is out-of-range.errors.txt
index 812f55c9be313..f4a6f8d147e63 100644
--- a/tests/baselines/reference/transpile/Report an error when compiler-options target-script is out-of-range.errors.txt	
+++ b/tests/baselines/reference/transpile/Report an error when compiler-options target-script is out-of-range.errors.txt	
@@ -1,6 +1,6 @@
-error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext'.
+error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext', 'node12', 'nodenext'.
 
 
-!!! error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext'.
+!!! error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext', 'node12', 'nodenext'.
 ==== file.ts (0 errors) ====
     
\ No newline at end of file
diff --git a/tests/baselines/reference/transpile/Report an error when compiler-options target-script is out-of-range.oldTranspile.errors.txt b/tests/baselines/reference/transpile/Report an error when compiler-options target-script is out-of-range.oldTranspile.errors.txt
index 812f55c9be313..f4a6f8d147e63 100644
--- a/tests/baselines/reference/transpile/Report an error when compiler-options target-script is out-of-range.oldTranspile.errors.txt	
+++ b/tests/baselines/reference/transpile/Report an error when compiler-options target-script is out-of-range.oldTranspile.errors.txt	
@@ -1,6 +1,6 @@
-error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext'.
+error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext', 'node12', 'nodenext'.
 
 
-!!! error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext'.
+!!! error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'es2020', 'esnext', 'node12', 'nodenext'.
 ==== file.ts (0 errors) ====
     
\ No newline at end of file
diff --git a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/files-containing-json-file.js b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/files-containing-json-file.js
index 024124e902148..761d5e83e6cf7 100644
--- a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/files-containing-json-file.js
+++ b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/files-containing-json-file.js
@@ -62,7 +62,7 @@ Output::
 [12:00:00 AM] Building project '/src/tsconfig_withFiles.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/src/hello.json
   Imported via "./hello.json" from file 'src/src/index.ts'
   Part of 'files' list in tsconfig.json
diff --git a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-and-files.js b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-and-files.js
index 9eac7d6941344..a39c9a4c2fc9c 100644
--- a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-and-files.js
+++ b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-and-files.js
@@ -65,7 +65,7 @@ Output::
 [12:00:00 AM] Building project '/src/tsconfig_withIncludeAndFiles.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/src/hello.json
   Part of 'files' list in tsconfig.json
   Imported via "./hello.json" from file 'src/src/index.ts'
diff --git a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-of-json-along-with-other-include-and-file-name-matches-ts-file.js b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-of-json-along-with-other-include-and-file-name-matches-ts-file.js
index ee56612178f8f..a9f864eb9ce7d 100644
--- a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-of-json-along-with-other-include-and-file-name-matches-ts-file.js
+++ b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-of-json-along-with-other-include-and-file-name-matches-ts-file.js
@@ -60,7 +60,7 @@ Output::
 [12:00:00 AM] Building project '/src/tsconfig_withIncludeOfJson.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/src/index.json
   Imported via "./index.json" from file 'src/src/index.ts'
   Matched by include pattern 'src/**/*.json' in 'src/tsconfig_withIncludeOfJson.json'
diff --git a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-of-json-along-with-other-include.js b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-of-json-along-with-other-include.js
index 8416d4d8875ff..13c1edfb0227c 100644
--- a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-of-json-along-with-other-include.js
+++ b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-of-json-along-with-other-include.js
@@ -62,7 +62,7 @@ Output::
 [12:00:00 AM] Building project '/src/tsconfig_withIncludeOfJson.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/src/hello.json
   Imported via "./hello.json" from file 'src/src/index.ts'
   Matched by include pattern 'src/**/*.json' in 'src/tsconfig_withIncludeOfJson.json'
diff --git a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-only.js b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-only.js
index 8e4f275ff5480..c865691cdf6bd 100644
--- a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-only.js
+++ b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/include-only.js
@@ -67,7 +67,7 @@ Output::
                     ~~~~~~~~~~~~~~
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/src/hello.json
   Imported via "./hello.json" from file 'src/src/index.ts'
 src/src/index.ts
diff --git a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/sourcemap.js b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/sourcemap.js
index ea38f8b9f90b7..6c6c6d52e20ea 100644
--- a/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/sourcemap.js
+++ b/tests/baselines/reference/tsbuild/resolveJsonModule/initial-build/sourcemap.js
@@ -62,7 +62,7 @@ Output::
 [12:01:00 AM] Building project '/src/tsconfig_withFiles.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/src/hello.json
   Imported via "./hello.json" from file 'src/src/index.ts'
   Part of 'files' list in tsconfig.json
diff --git a/tests/baselines/reference/tsbuild/sample1/initial-build/explainFiles.js b/tests/baselines/reference/tsbuild/sample1/initial-build/explainFiles.js
index ea560846edfb0..74c2463e3a398 100644
--- a/tests/baselines/reference/tsbuild/sample1/initial-build/explainFiles.js
+++ b/tests/baselines/reference/tsbuild/sample1/initial-build/explainFiles.js
@@ -108,7 +108,7 @@ Output::
 [12:01:00 AM] Building project '/src/core/tsconfig.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/core/anotherModule.ts
   Matched by include pattern '**/*' in 'src/core/tsconfig.json'
 src/core/index.ts
@@ -120,7 +120,7 @@ src/core/some_decl.d.ts
 [12:01:00 AM] Building project '/src/logic/tsconfig.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/core/index.d.ts
   Imported via '../core/index' from file 'src/logic/index.ts'
   File is output of project reference source 'src/core/index.ts'
@@ -134,7 +134,7 @@ src/logic/index.ts
 [12:01:00 AM] Building project '/src/tests/tsconfig.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/core/index.d.ts
   Imported via '../core/index' from file 'src/tests/index.ts'
   File is output of project reference source 'src/core/index.ts'
@@ -450,7 +450,7 @@ Output::
 [12:04:00 AM] Updating unchanged output timestamps of project '/src/core/tsconfig.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/core/anotherModule.ts
   Matched by include pattern '**/*' in 'src/core/tsconfig.json'
 src/core/index.ts
@@ -462,7 +462,7 @@ src/core/some_decl.d.ts
 [12:04:00 AM] Building project '/src/logic/tsconfig.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/core/index.d.ts
   Imported via '../core/index' from file 'src/logic/index.ts'
   File is output of project reference source 'src/core/index.ts'
@@ -476,7 +476,7 @@ src/logic/index.ts
 [12:04:00 AM] Building project '/src/tests/tsconfig.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/core/index.d.ts
   Imported via '../core/index' from file 'src/tests/index.ts'
   File is output of project reference source 'src/core/index.ts'
@@ -753,7 +753,7 @@ Output::
 [12:07:00 AM] Updating unchanged output timestamps of project '/src/core/tsconfig.json'...
 
 lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 src/core/anotherModule.ts
   Matched by include pattern '**/*' in 'src/core/tsconfig.json'
 src/core/index.ts
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js b/tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
index d58956b4597bb..f92c3a45152d6 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js
@@ -73,7 +73,7 @@ default: ES3
 
 --module, -m
 Specify what module code is generated.
-one of: none, commonjs, amd, system, umd, es6, es2015, es2020, esnext
+one of: none, commonjs, amd, system, umd, es6, es2015, es2020, esnext, node12, nodenext
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
diff --git a/tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js b/tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
index d58956b4597bb..f92c3a45152d6 100644
--- a/tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
+++ b/tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js
@@ -73,7 +73,7 @@ default: ES3
 
 --module, -m
 Specify what module code is generated.
-one of: none, commonjs, amd, system, umd, es6, es2015, es2020, esnext
+one of: none, commonjs, amd, system, umd, es6, es2015, es2020, esnext, node12, nodenext
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/jsxImportSource-option-changed.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/jsxImportSource-option-changed.js
index 3338233b3909f..eaf8dd041f62b 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/jsxImportSource-option-changed.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/jsxImportSource-option-changed.js
@@ -52,7 +52,7 @@ Output::
     File is matched by 'files' list specified here.
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 node_modules/react/jsx-Runtime/index.d.ts
   Part of 'files' list in tsconfig.json
   Imported via "react/jsx-runtime" from file 'index.tsx' with packageId 'react/jsx-runtime/index.d.ts@0.0.1' to import 'jsx' and 'jsxs' factory functions
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-Windows-style-drive-root-is-lowercase.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-Windows-style-drive-root-is-lowercase.js
index ba9744a17f4cb..33e472c837816 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-Windows-style-drive-root-is-lowercase.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-Windows-style-drive-root-is-lowercase.js
@@ -36,7 +36,7 @@ Output::
 [12:00:17 AM] Starting compilation in watch mode...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 project/a.ts
   Matched by include pattern '**/*' in 'project/tsconfig.json'
   Imported via "C://project/a" from file 'project/b.ts'
@@ -119,7 +119,7 @@ Output::
 [12:00:25 AM] File change detected. Starting incremental compilation...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 project/a.ts
   Matched by include pattern '**/*' in 'project/tsconfig.json'
   Imported via "C://project/a" from file 'project/b.ts'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-Windows-style-drive-root-is-uppercase.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-Windows-style-drive-root-is-uppercase.js
index ab1200f39b443..e8961da542b86 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-Windows-style-drive-root-is-uppercase.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-Windows-style-drive-root-is-uppercase.js
@@ -36,7 +36,7 @@ Output::
 [12:00:17 AM] Starting compilation in watch mode...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 project/a.ts
   Matched by include pattern '**/*' in 'project/tsconfig.json'
   Imported via "C://project/a" from file 'project/b.ts'
@@ -119,7 +119,7 @@ Output::
 [12:00:25 AM] File change detected. Starting incremental compilation...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 project/a.ts
   Matched by include pattern '**/*' in 'project/tsconfig.json'
   Imported via "C://project/a" from file 'project/b.ts'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-both-directory-symlink-target-and-import-match-disk.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-both-directory-symlink-target-and-import-match-disk.js
index bd308029095cf..634c9ca43fadb 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-both-directory-symlink-target-and-import-match-disk.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-both-directory-symlink-target-and-import-match-disk.js
@@ -37,7 +37,7 @@ Output::
 [12:00:27 AM] Starting compilation in watch mode...
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY/a.ts
   Imported via "./XY/a" from file 'b.ts'
   Matched by include pattern '**/*' in 'tsconfig.json'
@@ -147,7 +147,7 @@ Output::
 [12:00:33 AM] File change detected. Starting incremental compilation...
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY/a.ts
   Imported via "./XY/a" from file 'b.ts'
   Matched by include pattern '**/*' in 'tsconfig.json'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-both-file-symlink-target-and-import-match-disk.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-both-file-symlink-target-and-import-match-disk.js
index 9aba67160c4de..53467069a4612 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-both-file-symlink-target-and-import-match-disk.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-both-file-symlink-target-and-import-match-disk.js
@@ -37,7 +37,7 @@ Output::
 [12:00:25 AM] Starting compilation in watch mode...
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
   Imported via "./XY" from file 'b.ts'
@@ -135,7 +135,7 @@ Output::
 [12:00:35 AM] File change detected. Starting incremental compilation...
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
   Imported via "./XY" from file 'b.ts'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-directory-symlink-target-matches-disk-but-import-does-not.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-directory-symlink-target-matches-disk-but-import-does-not.js
index a471f439dcc4e..b847f8fdb410d 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-directory-symlink-target-matches-disk-but-import-does-not.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-directory-symlink-target-matches-disk-but-import-does-not.js
@@ -37,7 +37,7 @@ Output::
 [12:00:27 AM] Starting compilation in watch mode...
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY/a.ts
   Imported via "./XY/a" from file 'b.ts'
   Matched by include pattern '**/*' in 'tsconfig.json'
@@ -147,7 +147,7 @@ Output::
 [12:00:33 AM] File change detected. Starting incremental compilation...
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY/a.ts
   Imported via "./XY/a" from file 'b.ts'
   Matched by include pattern '**/*' in 'tsconfig.json'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-file-symlink-target-matches-disk-but-import-does-not.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-file-symlink-target-matches-disk-but-import-does-not.js
index 87d683f1bd9ed..094ce2ca94265 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-file-symlink-target-matches-disk-but-import-does-not.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-file-symlink-target-matches-disk-but-import-does-not.js
@@ -37,7 +37,7 @@ Output::
 [12:00:25 AM] Starting compilation in watch mode...
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
   Imported via "./XY" from file 'b.ts'
@@ -135,7 +135,7 @@ Output::
 [12:00:35 AM] File change detected. Starting incremental compilation...
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
   Imported via "./XY" from file 'b.ts'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import,-directory-symlink-target,-and-disk-are-all-different.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import,-directory-symlink-target,-and-disk-are-all-different.js
index 69b82b693d6af..c9f4403e401f2 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import,-directory-symlink-target,-and-disk-are-all-different.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import,-directory-symlink-target,-and-disk-are-all-different.js
@@ -42,7 +42,7 @@ Output::
                     ~~~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 link/a.ts
   Imported via "./link/a" from file 'b.ts'
 b.ts
@@ -158,7 +158,7 @@ Output::
                     ~~~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 link/a.ts
   Imported via "./link/a" from file 'b.ts'
 b.ts
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import,-file-symlink-target,-and-disk-are-all-different.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import,-file-symlink-target,-and-disk-are-all-different.js
index 432449b6e600c..39c9167334e37 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import,-file-symlink-target,-and-disk-are-all-different.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import,-file-symlink-target,-and-disk-are-all-different.js
@@ -42,7 +42,7 @@ Output::
                     ~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
 link.ts
@@ -148,7 +148,7 @@ Output::
                     ~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
 link.ts
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-and-directory-symlink-target-agree-but-do-not-match-disk.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-and-directory-symlink-target-agree-but-do-not-match-disk.js
index f0d6ddc84018d..a3571bb39360c 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-and-directory-symlink-target-agree-but-do-not-match-disk.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-and-directory-symlink-target-agree-but-do-not-match-disk.js
@@ -45,7 +45,7 @@ Output::
                     ~~~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 Xy/a.ts
   Imported via "./Xy/a" from file 'b.ts'
   Matched by include pattern '**/*' in 'tsconfig.json'
@@ -163,7 +163,7 @@ Output::
                     ~~~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 Xy/a.ts
   Imported via "./Xy/a" from file 'b.ts'
   Matched by include pattern '**/*' in 'tsconfig.json'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-and-file-symlink-target-agree-but-do-not-match-disk.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-and-file-symlink-target-agree-but-do-not-match-disk.js
index 3f0f145845065..f0059e68a8b7b 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-and-file-symlink-target-agree-but-do-not-match-disk.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-and-file-symlink-target-agree-but-do-not-match-disk.js
@@ -45,7 +45,7 @@ Output::
                     ~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
   Imported via "./Xy" from file 'b.ts'
@@ -151,7 +151,7 @@ Output::
                     ~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
   Imported via "./Xy" from file 'b.ts'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-matches-disk-but-directory-symlink-target-does-not.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-matches-disk-but-directory-symlink-target-does-not.js
index d54b3f06b2648..effb28f973961 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-matches-disk-but-directory-symlink-target-does-not.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-matches-disk-but-directory-symlink-target-does-not.js
@@ -45,7 +45,7 @@ Output::
                     ~~~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 Xy/a.ts
   Imported via "./Xy/a" from file 'b.ts'
   Matched by include pattern '**/*' in 'tsconfig.json'
@@ -163,7 +163,7 @@ Output::
                     ~~~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 Xy/a.ts
   Imported via "./Xy/a" from file 'b.ts'
   Matched by include pattern '**/*' in 'tsconfig.json'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-matches-disk-but-file-symlink-target-does-not.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-matches-disk-but-file-symlink-target-does-not.js
index c62772d275d25..23c67c71ac06b 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-matches-disk-but-file-symlink-target-does-not.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-import-matches-disk-but-file-symlink-target-does-not.js
@@ -45,7 +45,7 @@ Output::
                     ~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
   Imported via "./Xy" from file 'b.ts'
@@ -151,7 +151,7 @@ Output::
                     ~~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 XY.ts
   Matched by include pattern '**/*' in 'tsconfig.json'
   Imported via "./Xy" from file 'b.ts'
diff --git a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-relative-information-file-location-changes.js b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-relative-information-file-location-changes.js
index 0eff5f906f7d1..481cc141c2a56 100644
--- a/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-relative-information-file-location-changes.js
+++ b/tests/baselines/reference/tscWatch/forceConsistentCasingInFileNames/when-relative-information-file-location-changes.js
@@ -59,7 +59,7 @@ Output::
     File is included via import here.
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 ModuleC.ts
   Imported via "./ModuleC" from file 'moduleA.ts'
   Imported via "./moduleC" from file 'moduleB.ts'
@@ -174,7 +174,7 @@ Output::
     File is included via import here.
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 ModuleC.ts
   Imported via "./ModuleC" from file 'moduleA.ts'
   Imported via "./moduleC" from file 'moduleB.ts'
diff --git a/tests/baselines/reference/tscWatch/incremental/jsxImportSource-option-changed-incremental.js b/tests/baselines/reference/tscWatch/incremental/jsxImportSource-option-changed-incremental.js
index 38630e619acfd..ad6442b726541 100644
--- a/tests/baselines/reference/tscWatch/incremental/jsxImportSource-option-changed-incremental.js
+++ b/tests/baselines/reference/tscWatch/incremental/jsxImportSource-option-changed-incremental.js
@@ -58,7 +58,7 @@ export const App = () => <div propA={true}></div>;
 /a/lib/tsc.js -i --explainFiles
 Output::
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 node_modules/react/jsx-runtime/index.d.ts
   Imported via "react/jsx-runtime" from file 'index.tsx' with packageId 'react/jsx-runtime/index.d.ts@0.0.1' to import 'jsx' and 'jsxs' factory functions
 index.tsx
@@ -172,7 +172,7 @@ Output::
                                 ~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 node_modules/preact/jsx-runtime/index.d.ts
   Imported via "preact/jsx-runtime" from file 'index.tsx' with packageId 'preact/jsx-runtime/index.d.ts@0.0.1' to import 'jsx' and 'jsxs' factory functions
 index.tsx
diff --git a/tests/baselines/reference/tscWatch/incremental/jsxImportSource-option-changed-watch.js b/tests/baselines/reference/tscWatch/incremental/jsxImportSource-option-changed-watch.js
index c18f3be8f52bb..a015c1fffc23c 100644
--- a/tests/baselines/reference/tscWatch/incremental/jsxImportSource-option-changed-watch.js
+++ b/tests/baselines/reference/tscWatch/incremental/jsxImportSource-option-changed-watch.js
@@ -61,7 +61,7 @@ Output::
 [12:00:39 AM] Starting compilation in watch mode...
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 node_modules/react/jsx-runtime/index.d.ts
   Imported via "react/jsx-runtime" from file 'index.tsx' with packageId 'react/jsx-runtime/index.d.ts@0.0.1' to import 'jsx' and 'jsxs' factory functions
 index.tsx
@@ -194,7 +194,7 @@ Output::
                                 ~~~~~
 
 ../../../../a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 node_modules/preact/jsx-runtime/index.d.ts
   Imported via "preact/jsx-runtime" from file 'index.tsx' with packageId 'preact/jsx-runtime/index.d.ts@0.0.1' to import 'jsx' and 'jsxs' factory functions
 index.tsx
diff --git a/tests/baselines/reference/tscWatch/programUpdates/changes-in-files-are-reflected-in-project-structure.js b/tests/baselines/reference/tscWatch/programUpdates/changes-in-files-are-reflected-in-project-structure.js
index 4f21e9cf90663..304bbecca58b1 100644
--- a/tests/baselines/reference/tscWatch/programUpdates/changes-in-files-are-reflected-in-project-structure.js
+++ b/tests/baselines/reference/tscWatch/programUpdates/changes-in-files-are-reflected-in-project-structure.js
@@ -28,7 +28,7 @@ Output::
 [12:00:19 AM] Starting compilation in watch mode...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 a/b/f2.ts
   Imported via "./f2" from file 'a/b/f1.ts'
 a/b/f1.ts
@@ -105,7 +105,7 @@ Output::
 [12:00:27 AM] File change detected. Starting incremental compilation...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 a/c/f3.ts
   Imported via "../c/f3" from file 'a/b/f2.ts'
 a/b/f2.ts
diff --git a/tests/baselines/reference/tscWatch/programUpdates/handle-recreated-files-correctly.js b/tests/baselines/reference/tscWatch/programUpdates/handle-recreated-files-correctly.js
index a8912e59ee4af..a1adb29d11034 100644
--- a/tests/baselines/reference/tscWatch/programUpdates/handle-recreated-files-correctly.js
+++ b/tests/baselines/reference/tscWatch/programUpdates/handle-recreated-files-correctly.js
@@ -28,7 +28,7 @@ Output::
 [12:00:17 AM] Starting compilation in watch mode...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 a/b/commonFile1.ts
   Matched by include pattern '**/*' in 'a/b/tsconfig.json'
 a/b/commonFile2.ts
@@ -96,7 +96,7 @@ Output::
 [12:00:25 AM] File change detected. Starting incremental compilation...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 a/b/commonFile1.ts
   Matched by include pattern '**/*' in 'a/b/tsconfig.json'
 a/b/commonFile2.ts
@@ -159,7 +159,7 @@ Output::
 [12:00:34 AM] File change detected. Starting incremental compilation...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 a/b/commonFile1.ts
   Matched by include pattern '**/*' in 'a/b/tsconfig.json'
 [12:00:38 AM] Found 0 errors. Watching for file changes.
@@ -211,7 +211,7 @@ Output::
 [12:00:41 AM] File change detected. Starting incremental compilation...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 a/b/commonFile1.ts
   Matched by include pattern '**/*' in 'a/b/tsconfig.json'
 a/b/commonFile2.ts
diff --git a/tests/baselines/reference/tscWatch/programUpdates/should-reflect-change-in-config-file.js b/tests/baselines/reference/tscWatch/programUpdates/should-reflect-change-in-config-file.js
index 9c2504a22196e..f645329658ee8 100644
--- a/tests/baselines/reference/tscWatch/programUpdates/should-reflect-change-in-config-file.js
+++ b/tests/baselines/reference/tscWatch/programUpdates/should-reflect-change-in-config-file.js
@@ -31,7 +31,7 @@ Output::
 [12:00:17 AM] Starting compilation in watch mode...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 a/b/commonFile1.ts
   Part of 'files' list in tsconfig.json
 a/b/commonFile2.ts
@@ -97,7 +97,7 @@ Output::
 [12:00:25 AM] File change detected. Starting incremental compilation...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 a/b/commonFile1.ts
   Part of 'files' list in tsconfig.json
 a/b/commonFile2.ts
@@ -163,7 +163,7 @@ Output::
 [12:00:36 AM] File change detected. Starting incremental compilation...
 
 a/lib/lib.d.ts
-  Default library
+  Default library for target 'es3'
 a/b/commonFile1.ts
   Part of 'files' list in tsconfig.json
 [12:00:40 AM] Found 0 errors. Watching for file changes.
diff --git a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-after-old-one-without-file-being-in-config.js b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-after-old-one-without-file-being-in-config.js
index 325bc051f381f..96d0a07984ea5 100644
--- a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-after-old-one-without-file-being-in-config.js
+++ b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-after-old-one-without-file-being-in-config.js
@@ -32,7 +32,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
diff --git a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-after-old-one.js b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-after-old-one.js
index 337fd59507a6d..dfb62bb307403 100644
--- a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-after-old-one.js
+++ b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-after-old-one.js
@@ -32,7 +32,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
diff --git a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-before-old-one-without-file-being-in-config.js b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-before-old-one-without-file-being-in-config.js
index 7702cbca6d98b..8084ad64c472d 100644
--- a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-before-old-one-without-file-being-in-config.js
+++ b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-before-old-one-without-file-being-in-config.js
@@ -32,7 +32,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
diff --git a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-before-old-one.js b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-before-old-one.js
index 6bf78ae82a4c5..e5da699f3861a 100644
--- a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-before-old-one.js
+++ b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-after-watcher-is-invoked,-ask-errors-on-it-before-old-one.js
@@ -32,7 +32,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
diff --git a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-after-old-one-without-file-being-in-config.js b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-after-old-one-without-file-being-in-config.js
index 1c39c0c715d34..4336a83c99f93 100644
--- a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-after-old-one-without-file-being-in-config.js
+++ b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-after-old-one-without-file-being-in-config.js
@@ -32,7 +32,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
diff --git a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-after-old-one.js b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-after-old-one.js
index c829851b74ff9..6a0eac03a9f58 100644
--- a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-after-old-one.js
+++ b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-after-old-one.js
@@ -32,7 +32,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
@@ -120,7 +120,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
diff --git a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-before-old-one-without-file-being-in-config.js b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-before-old-one-without-file-being-in-config.js
index 7f69e67354d27..f96320da3a712 100644
--- a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-before-old-one-without-file-being-in-config.js
+++ b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-before-old-one-without-file-being-in-config.js
@@ -32,7 +32,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
diff --git a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-before-old-one.js b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-before-old-one.js
index a667534acafff..62214db3c51e3 100644
--- a/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-before-old-one.js
+++ b/tests/baselines/reference/tsserver/configuredProjects/creating-new-file-and-then-open-it-before-watcher-is-invoked,-ask-errors-on-it-before-old-one.js
@@ -32,7 +32,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
@@ -126,7 +126,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/bar.ts
 	  Matched by include pattern './src' in 'tsconfig.json'
 	src/foo.ts
diff --git a/tests/baselines/reference/tsserver/forceConsistentCasingInFileNames/when-changing-module-name-with-different-casing.js b/tests/baselines/reference/tsserver/forceConsistentCasingInFileNames/when-changing-module-name-with-different-casing.js
index f01516e4e14e8..4b5747816f6be 100644
--- a/tests/baselines/reference/tsserver/forceConsistentCasingInFileNames/when-changing-module-name-with-different-casing.js
+++ b/tests/baselines/reference/tsserver/forceConsistentCasingInFileNames/when-changing-module-name-with-different-casing.js
@@ -33,7 +33,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	Logger.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 	  Imported via "./Logger" from file 'another.ts'
diff --git a/tests/baselines/reference/tsserver/forceConsistentCasingInFileNames/works-when-renaming-file-with-different-casing.js b/tests/baselines/reference/tsserver/forceConsistentCasingInFileNames/works-when-renaming-file-with-different-casing.js
index ed681eaf86b15..1af314f8ae86a 100644
--- a/tests/baselines/reference/tsserver/forceConsistentCasingInFileNames/works-when-renaming-file-with-different-casing.js
+++ b/tests/baselines/reference/tsserver/forceConsistentCasingInFileNames/works-when-renaming-file-with-different-casing.js
@@ -33,7 +33,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	Logger.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 	  Imported via "./Logger" from file 'another.ts'
diff --git a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-changes.js b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-changes.js
index 8c242cf0fecd9..c290bb78497b0 100644
--- a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-changes.js
+++ b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-changes.js
@@ -29,7 +29,7 @@ Project '/a/b/tsconfig.json' (Configured)
 
 
 	../lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	app.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-doesnt-have-errors.js b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-doesnt-have-errors.js
index 9688e4a49068f..99c6e880c5c2c 100644
--- a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-doesnt-have-errors.js
+++ b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-doesnt-have-errors.js
@@ -29,7 +29,7 @@ Project '/a/b/tsconfig.json' (Configured)
 
 
 	../lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	app.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-has-errors.js b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-has-errors.js
index 032b65c6a58a9..127e18a12073d 100644
--- a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-has-errors.js
+++ b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-generated-when-the-config-file-has-errors.js
@@ -29,7 +29,7 @@ Project '/a/b/tsconfig.json' (Configured)
 
 
 	../lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	app.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-does-not-include-file-opened-and-config-file-has-errors.js b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-does-not-include-file-opened-and-config-file-has-errors.js
index b0684a5698ddc..f882b6b064d5a 100644
--- a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-does-not-include-file-opened-and-config-file-has-errors.js
+++ b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-does-not-include-file-opened-and-config-file-has-errors.js
@@ -28,7 +28,7 @@ Project '/a/b/tsconfig.json' (Configured)
 
 
 	../lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	app.ts
 	  Part of 'files' list in tsconfig.json
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-does-not-include-file-opened-and-doesnt-contain-any-errors.js b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-does-not-include-file-opened-and-doesnt-contain-any-errors.js
index 25d9ca79a925d..77afe57d1a0a2 100644
--- a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-does-not-include-file-opened-and-doesnt-contain-any-errors.js
+++ b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-does-not-include-file-opened-and-doesnt-contain-any-errors.js
@@ -28,7 +28,7 @@ Project '/a/b/tsconfig.json' (Configured)
 
 
 	../lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	app.ts
 	  Part of 'files' list in tsconfig.json
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-has-errors-but-suppressDiagnosticEvents-is-true.js b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-has-errors-but-suppressDiagnosticEvents-is-true.js
index b729e90e9b23c..41cfb0ff06673 100644
--- a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-has-errors-but-suppressDiagnosticEvents-is-true.js
+++ b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-are-not-generated-when-the-config-file-has-errors-but-suppressDiagnosticEvents-is-true.js
@@ -29,7 +29,7 @@ Project '/a/b/tsconfig.json' (Configured)
 
 
 	../lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	app.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-contains-the-project-reference-errors.js b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-contains-the-project-reference-errors.js
index 921b483df6b03..64727ed96257e 100644
--- a/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-contains-the-project-reference-errors.js
+++ b/tests/baselines/reference/tsserver/projectErrors/configFileDiagnostic-events-contains-the-project-reference-errors.js
@@ -42,7 +42,7 @@ Project '/a/b/tsconfig.json' (Configured)
 
 
 	../lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	app.ts
 	  Part of 'files' list in tsconfig.json
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/correct-errors-when-resolution-resolves-to-file-that-has-same-ambient-module-and-is-also-module.js b/tests/baselines/reference/tsserver/projectErrors/correct-errors-when-resolution-resolves-to-file-that-has-same-ambient-module-and-is-also-module.js
index 2bd9071b01162..a5b8f28ac9430 100644
--- a/tests/baselines/reference/tsserver/projectErrors/correct-errors-when-resolution-resolves-to-file-that-has-same-ambient-module-and-is-also-module.js
+++ b/tests/baselines/reference/tsserver/projectErrors/correct-errors-when-resolution-resolves-to-file-that-has-same-ambient-module-and-is-also-module.js
@@ -35,7 +35,7 @@ Project '/users/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	node_modules/@custom/plugin/proposed.d.ts
 	  Imported via './proposed' from file 'node_modules/@custom/plugin/index.d.ts'
 	node_modules/@custom/plugin/index.d.ts
diff --git a/tests/baselines/reference/tsserver/projectErrors/folder-rename-updates-project-structure-and-reports-no-errors.js b/tests/baselines/reference/tsserver/projectErrors/folder-rename-updates-project-structure-and-reports-no-errors.js
index b505843b86c3e..9d4011c2649fc 100644
--- a/tests/baselines/reference/tsserver/projectErrors/folder-rename-updates-project-structure-and-reports-no-errors.js
+++ b/tests/baselines/reference/tsserver/projectErrors/folder-rename-updates-project-structure-and-reports-no-errors.js
@@ -42,7 +42,7 @@ event:
 event:
     {"seq":0,"type":"event","event":"telemetry","body":{"telemetryEventName":"projectInfo","payload":{"projectId":"c56abb8c7c51bef5953613f05226da8e72cd9eafe09ab58ca2ccd81b65ba193a","fileStats":{"js":0,"jsSize":0,"jsx":0,"jsxSize":0,"ts":2,"tsSize":154,"tsx":0,"tsxSize":0,"dts":0,"dtsSize":0,"deferred":0,"deferredSize":0},"compilerOptions":{"module":"none"},"typeAcquisition":{"enable":false,"include":false,"exclude":false},"extends":false,"files":false,"include":false,"exclude":true,"compileOnSave":false,"configFileName":"tsconfig.json","projectType":"configured","languageServiceEnabled":true,"version":"FakeVersion"}}}
 event:
-    {"seq":0,"type":"event","event":"configFileDiag","body":{"triggerFile":"/a/b/projects/myproject/bar/app.ts","configFile":"/a/b/projects/myproject/tsconfig.json","diagnostics":[{"text":"File '/a/lib/lib.d.ts' not found.\n  The file is in the program because:\n    Default library","code":6053,"category":"error"},{"text":"Cannot find global type 'Array'.","code":2318,"category":"error"},{"text":"Cannot find global type 'Boolean'.","code":2318,"category":"error"},{"text":"Cannot find global type 'Function'.","code":2318,"category":"error"},{"text":"Cannot find global type 'IArguments'.","code":2318,"category":"error"},{"text":"Cannot find global type 'Number'.","code":2318,"category":"error"},{"text":"Cannot find global type 'Object'.","code":2318,"category":"error"},{"text":"Cannot find global type 'RegExp'.","code":2318,"category":"error"},{"text":"Cannot find global type 'String'.","code":2318,"category":"error"},{"start":{"line":1,"offset":37},"end":{"line":1,"offset":45},"text":"Unknown compiler option 'targer'. Did you mean 'target'?","code":5025,"category":"error","fileName":"/a/b/projects/myproject/tsconfig.json"}]}}
+    {"seq":0,"type":"event","event":"configFileDiag","body":{"triggerFile":"/a/b/projects/myproject/bar/app.ts","configFile":"/a/b/projects/myproject/tsconfig.json","diagnostics":[{"text":"File '/a/lib/lib.d.ts' not found.\n  The file is in the program because:\n    Default library for target 'es3'","code":6053,"category":"error"},{"text":"Cannot find global type 'Array'.","code":2318,"category":"error"},{"text":"Cannot find global type 'Boolean'.","code":2318,"category":"error"},{"text":"Cannot find global type 'Function'.","code":2318,"category":"error"},{"text":"Cannot find global type 'IArguments'.","code":2318,"category":"error"},{"text":"Cannot find global type 'Number'.","code":2318,"category":"error"},{"text":"Cannot find global type 'Object'.","code":2318,"category":"error"},{"text":"Cannot find global type 'RegExp'.","code":2318,"category":"error"},{"text":"Cannot find global type 'String'.","code":2318,"category":"error"},{"start":{"line":1,"offset":37},"end":{"line":1,"offset":45},"text":"Unknown compiler option 'targer'. Did you mean 'target'?","code":5025,"category":"error","fileName":"/a/b/projects/myproject/tsconfig.json"}]}}
 Project '/a/b/projects/myproject/tsconfig.json' (Configured)
 	Files (2)
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/npm-install-when-timeout-occurs-after-installation.js b/tests/baselines/reference/tsserver/projectErrors/npm-install-when-timeout-occurs-after-installation.js
index 419c68f410458..584478548a45f 100644
--- a/tests/baselines/reference/tsserver/projectErrors/npm-install-when-timeout-occurs-after-installation.js
+++ b/tests/baselines/reference/tsserver/projectErrors/npm-install-when-timeout-occurs-after-installation.js
@@ -33,7 +33,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/main.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -233,7 +233,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	node_modules/@angular/core/index.d.ts
 	  Imported via '@angular/core' from file 'src/main.ts'
 	src/main.ts
diff --git a/tests/baselines/reference/tsserver/projectErrors/npm-install-when-timeout-occurs-inbetween-installation.js b/tests/baselines/reference/tsserver/projectErrors/npm-install-when-timeout-occurs-inbetween-installation.js
index b17e03d859139..9fb71d1254428 100644
--- a/tests/baselines/reference/tsserver/projectErrors/npm-install-when-timeout-occurs-inbetween-installation.js
+++ b/tests/baselines/reference/tsserver/projectErrors/npm-install-when-timeout-occurs-inbetween-installation.js
@@ -33,7 +33,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/main.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -256,7 +256,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	node_modules/@angular/core/index.d.ts
 	  Imported via '@angular/core' from file 'src/main.ts'
 	src/main.ts
diff --git a/tests/baselines/reference/tsserver/projectErrors/should-not-report-incorrect-error-when-json-is-root-file-found-by-tsconfig.js b/tests/baselines/reference/tsserver/projectErrors/should-not-report-incorrect-error-when-json-is-root-file-found-by-tsconfig.js
index 789290aa830d7..0d1830af78290 100644
--- a/tests/baselines/reference/tsserver/projectErrors/should-not-report-incorrect-error-when-json-is-root-file-found-by-tsconfig.js
+++ b/tests/baselines/reference/tsserver/projectErrors/should-not-report-incorrect-error-when-json-is-root-file-found-by-tsconfig.js
@@ -36,7 +36,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/blabla.json
 	  Imported via "./blabla.json" from file 'src/test.ts'
 	  Matched by include pattern './src/*.json' in 'tsconfig.json'
diff --git a/tests/baselines/reference/tsserver/projectErrors/should-report-error-when-json-is-not-root-file-found-by-tsconfig.js b/tests/baselines/reference/tsserver/projectErrors/should-report-error-when-json-is-not-root-file-found-by-tsconfig.js
index 6d6136fac9911..3d897aa23e320 100644
--- a/tests/baselines/reference/tsserver/projectErrors/should-report-error-when-json-is-not-root-file-found-by-tsconfig.js
+++ b/tests/baselines/reference/tsserver/projectErrors/should-report-error-when-json-is-not-root-file-found-by-tsconfig.js
@@ -35,7 +35,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/blabla.json
 	  Imported via "./blabla.json" from file 'src/test.ts'
 	src/test.ts
diff --git a/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-gerErr-with-sync-commands.js b/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-gerErr-with-sync-commands.js
index 7eae40f0de5cc..ac2b48eaed2a7 100644
--- a/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-gerErr-with-sync-commands.js
+++ b/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-gerErr-with-sync-commands.js
@@ -27,7 +27,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	ui.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-getErr.js b/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-getErr.js
index 78983bd3745bc..e7f57c4b839e2 100644
--- a/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-getErr.js
+++ b/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-getErr.js
@@ -29,7 +29,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	ui.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-geterrForProject.js b/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-geterrForProject.js
index 364821360fa61..ca2aec830655e 100644
--- a/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-geterrForProject.js
+++ b/tests/baselines/reference/tsserver/projectErrors/when-semantic-error-returns-includes-global-error-geterrForProject.js
@@ -29,7 +29,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	ui.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectLanguageServiceStateEvent/large-file-size-is-determined-correctly.js b/tests/baselines/reference/tsserver/projectLanguageServiceStateEvent/large-file-size-is-determined-correctly.js
index 8d1455b514238..98221e5c651b8 100644
--- a/tests/baselines/reference/tsserver/projectLanguageServiceStateEvent/large-file-size-is-determined-correctly.js
+++ b/tests/baselines/reference/tsserver/projectLanguageServiceStateEvent/large-file-size-is-determined-correctly.js
@@ -33,7 +33,7 @@ Project '/a/jsconfig.json' (Configured)
 
 
 	lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	app.js
 	  Matched by include pattern '**/*' in 'jsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-gerErr-with-sync-commands.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-gerErr-with-sync-commands.js
index 45c47d45b079e..c4626262b1f57 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-gerErr-with-sync-commands.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-gerErr-with-sync-commands.js
@@ -53,7 +53,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Imported via '../decls/fns' from file 'usage.ts'
 	usage.ts
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-getErr.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-getErr.js
index 561c60b7d7d08..5ec2fe654cf39 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-getErr.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-getErr.js
@@ -55,7 +55,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Imported via '../decls/fns' from file 'usage.ts'
 	usage.ts
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-geterrForProject.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-geterrForProject.js
index ec714b9f6dfef..9aac5c5526945 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-geterrForProject.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-dependency-project-is-not-open-geterrForProject.js
@@ -55,7 +55,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Imported via '../decls/fns' from file 'usage.ts'
 	usage.ts
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-gerErr-with-sync-commands.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-gerErr-with-sync-commands.js
index da8fb9a79ca01..615d011501120 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-gerErr-with-sync-commands.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-gerErr-with-sync-commands.js
@@ -53,7 +53,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Imported via '../decls/fns' from file 'usage.ts'
 	usage.ts
@@ -89,7 +89,7 @@ Project '/user/username/projects/myproject/dependency/tsconfig.json' (Configured
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	fns.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-getErr.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-getErr.js
index a650ce4c29fe1..1c9a4d1781926 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-getErr.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-getErr.js
@@ -55,7 +55,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Imported via '../decls/fns' from file 'usage.ts'
 	usage.ts
@@ -99,7 +99,7 @@ Project '/user/username/projects/myproject/dependency/tsconfig.json' (Configured
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	fns.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-geterrForProject.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-geterrForProject.js
index 684abf3f76755..18e76ddb5e077 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-geterrForProject.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-module-scenario-when-the-depedency-file-is-open-geterrForProject.js
@@ -55,7 +55,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Imported via '../decls/fns' from file 'usage.ts'
 	usage.ts
@@ -99,7 +99,7 @@ Project '/user/username/projects/myproject/dependency/tsconfig.json' (Configured
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	fns.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-gerErr-with-sync-commands.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-gerErr-with-sync-commands.js
index a0f7645600aa5..d54d8a8ed4c58 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-gerErr-with-sync-commands.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-gerErr-with-sync-commands.js
@@ -52,7 +52,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Source from referenced project '../dependency/tsconfig.json' included because '--outFile' specified
 	usage.ts
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-getErr.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-getErr.js
index 8df29aefc933e..cd4980e3517a8 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-getErr.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-getErr.js
@@ -54,7 +54,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Source from referenced project '../dependency/tsconfig.json' included because '--outFile' specified
 	usage.ts
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-geterrForProject.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-geterrForProject.js
index 5324f46408194..0441470c96582 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-geterrForProject.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-dependency-project-is-not-open-geterrForProject.js
@@ -54,7 +54,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Source from referenced project '../dependency/tsconfig.json' included because '--outFile' specified
 	usage.ts
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-gerErr-with-sync-commands.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-gerErr-with-sync-commands.js
index 46987608856db..07b7d01685ea4 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-gerErr-with-sync-commands.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-gerErr-with-sync-commands.js
@@ -52,7 +52,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Source from referenced project '../dependency/tsconfig.json' included because '--outFile' specified
 	usage.ts
@@ -88,7 +88,7 @@ Project '/user/username/projects/myproject/dependency/tsconfig.json' (Configured
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	fns.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-getErr.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-getErr.js
index 38a5700630c27..bfd0a68ad057d 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-getErr.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-getErr.js
@@ -54,7 +54,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Source from referenced project '../dependency/tsconfig.json' included because '--outFile' specified
 	usage.ts
@@ -98,7 +98,7 @@ Project '/user/username/projects/myproject/dependency/tsconfig.json' (Configured
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	fns.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-geterrForProject.js b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-geterrForProject.js
index 24c278e2f9905..d9f23968cc7c8 100644
--- a/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-geterrForProject.js
+++ b/tests/baselines/reference/tsserver/projectReferenceErrors/with-non-module-when-the-depedency-file-is-open-geterrForProject.js
@@ -54,7 +54,7 @@ Project '/user/username/projects/myproject/usage/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../dependency/fns.ts
 	  Source from referenced project '../dependency/tsconfig.json' included because '--outFile' specified
 	usage.ts
@@ -98,7 +98,7 @@ Project '/user/username/projects/myproject/dependency/tsconfig.json' (Configured
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	fns.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectReferences/ancestor-and-project-ref-management.js b/tests/baselines/reference/tsserver/projectReferences/ancestor-and-project-ref-management.js
index c3b9c6f8d0df5..79bc5aad59d86 100644
--- a/tests/baselines/reference/tsserver/projectReferences/ancestor-and-project-ref-management.js
+++ b/tests/baselines/reference/tsserver/projectReferences/ancestor-and-project-ref-management.js
@@ -51,7 +51,7 @@ Project '/user/username/projects/container/compositeExec/tsconfig.json' (Configu
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../lib/index.ts
 	  Source from referenced project '../lib/tsconfig.json' included because '--outFile' specified
 	index.ts
@@ -134,7 +134,7 @@ Project '/user/username/projects/container/lib/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	index.ts
 	  Part of 'files' list in tsconfig.json
 
@@ -196,7 +196,7 @@ Project '/user/username/projects/container/exec/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../lib/index.ts
 	  Source from referenced project '../lib/tsconfig.json' included because '--outFile' specified
 	index.ts
@@ -353,7 +353,7 @@ Project '/user/username/projects/container/compositeExec/tsconfig.json' (Configu
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../lib/index.ts
 	  Source from referenced project '../lib/tsconfig.json' included because '--outFile' specified
 	index.ts
@@ -383,7 +383,7 @@ Project '/user/username/projects/container/lib/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	index.ts
 	  Part of 'files' list in tsconfig.json
 
@@ -401,7 +401,7 @@ Project '/user/username/projects/container/exec/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../lib/index.ts
 	  Source from referenced project '../lib/tsconfig.json' included because '--outFile' specified
 	index.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project-when-built-with-disableSourceOfProjectReferenceRedirect.js b/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project-when-built-with-disableSourceOfProjectReferenceRedirect.js
index c257c3c0f2e73..d7b7c45b64f85 100644
--- a/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project-when-built-with-disableSourceOfProjectReferenceRedirect.js
+++ b/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project-when-built-with-disableSourceOfProjectReferenceRedirect.js
@@ -68,7 +68,7 @@ Project '/user/username/projects/myproject/app/src/program/tsconfig.json' (Confi
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../../../shared/bld/library/index.d.ts
 	  Imported via "shared" from file 'bar.ts' with packageId 'shared/bld/library/index.d.ts@1.0.0'
 	bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project-when-built.js b/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project-when-built.js
index 6f7e0f4c7773c..6d2e6ff6b9038 100644
--- a/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project-when-built.js
+++ b/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project-when-built.js
@@ -67,7 +67,7 @@ Project '/user/username/projects/myproject/app/src/program/tsconfig.json' (Confi
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../../../shared/src/library/index.ts
 	  Imported via "shared" from file 'bar.ts' with packageId 'shared/bld/library/index.d.ts@1.0.0'
 	bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project.js b/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project.js
index 6f7e0f4c7773c..6d2e6ff6b9038 100644
--- a/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project.js
+++ b/tests/baselines/reference/tsserver/projectReferences/auto-import-with-referenced-project.js
@@ -67,7 +67,7 @@ Project '/user/username/projects/myproject/app/src/program/tsconfig.json' (Confi
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../../../shared/src/library/index.ts
 	  Imported via "shared" from file 'bar.ts' with packageId 'shared/bld/library/index.d.ts@1.0.0'
 	bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/can-successfully-find-references-with-out-option.js b/tests/baselines/reference/tsserver/projectReferences/can-successfully-find-references-with-out-option.js
index 901557f3c9ef1..1b0c0d2f7c153 100644
--- a/tests/baselines/reference/tsserver/projectReferences/can-successfully-find-references-with-out-option.js
+++ b/tests/baselines/reference/tsserver/projectReferences/can-successfully-find-references-with-out-option.js
@@ -51,7 +51,7 @@ Project '/user/username/projects/container/compositeExec/tsconfig.json' (Configu
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../lib/index.ts
 	  Source from referenced project '../lib/tsconfig.json' included because '--outFile' specified
 	index.ts
@@ -94,7 +94,7 @@ Project '/user/username/projects/container/lib/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	index.ts
 	  Part of 'files' list in tsconfig.json
 
@@ -156,7 +156,7 @@ Project '/user/username/projects/container/exec/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../lib/index.ts
 	  Source from referenced project '../lib/tsconfig.json' included because '--outFile' specified
 	index.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-first-indirect-project-but-not-in-another-one.js b/tests/baselines/reference/tsserver/projectReferences/disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-first-indirect-project-but-not-in-another-one.js
index 82ed7b753a83d..9a63c26b17209 100644
--- a/tests/baselines/reference/tsserver/projectReferences/disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-first-indirect-project-but-not-in-another-one.js
+++ b/tests/baselines/reference/tsserver/projectReferences/disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-first-indirect-project-but-not-in-another-one.js
@@ -101,7 +101,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -234,7 +234,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -355,7 +355,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
diff --git a/tests/baselines/reference/tsserver/projectReferences/disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-indirect-project.js b/tests/baselines/reference/tsserver/projectReferences/disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-indirect-project.js
index 45020c168612c..7e48c98547aa0 100644
--- a/tests/baselines/reference/tsserver/projectReferences/disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-indirect-project.js
+++ b/tests/baselines/reference/tsserver/projectReferences/disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-indirect-project.js
@@ -81,7 +81,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -214,7 +214,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -318,7 +318,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/does-not-error-on-container-only-project.js b/tests/baselines/reference/tsserver/projectReferences/does-not-error-on-container-only-project.js
index d9c6845a1a686..43b8000ef66b6 100644
--- a/tests/baselines/reference/tsserver/projectReferences/does-not-error-on-container-only-project.js
+++ b/tests/baselines/reference/tsserver/projectReferences/does-not-error-on-container-only-project.js
@@ -49,7 +49,7 @@ Project '/user/username/projects/container/compositeExec/tsconfig.json' (Configu
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../lib/index.ts
 	  Source from referenced project '../lib/tsconfig.json' included because '--outFile' specified
 	index.ts
@@ -90,7 +90,7 @@ Project '/user/username/projects/container/exec/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../lib/index.ts
 	  Source from referenced project '../lib/tsconfig.json' included because '--outFile' specified
 	index.ts
@@ -112,7 +112,7 @@ Project '/user/username/projects/container/lib/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	index.ts
 	  Part of 'files' list in tsconfig.json
 
diff --git a/tests/baselines/reference/tsserver/projectReferences/finding-local-reference-doesnt-load-ancestor/sibling-projects.js b/tests/baselines/reference/tsserver/projectReferences/finding-local-reference-doesnt-load-ancestor/sibling-projects.js
index b3b922c4b2c3b..e0b4059ce9765 100644
--- a/tests/baselines/reference/tsserver/projectReferences/finding-local-reference-doesnt-load-ancestor/sibling-projects.js
+++ b/tests/baselines/reference/tsserver/projectReferences/finding-local-reference-doesnt-load-ancestor/sibling-projects.js
@@ -32,7 +32,7 @@ Project '/user/username/projects/solution/compiler/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	types.ts
 	  Part of 'files' list in tsconfig.json
 	program.ts
@@ -117,7 +117,7 @@ Project '/user/username/projects/solution/services/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../compiler/types.ts
 	  Source from referenced project '../compiler/tsconfig.json' included because '--module' is specified as 'none'
 	../compiler/program.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-built-with-preserveSymlinks.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-built-with-preserveSymlinks.js
index f969c5b84e566..a9013a77c9bf3 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-built-with-preserveSymlinks.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-built-with-preserveSymlinks.js
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/index.ts
 	  Imported via 'b' from file 'src/index.ts'
 	../B/src/bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-built.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-built.js
index e60b86b81078d..04e4eb883df31 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-built.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-built.js
@@ -69,7 +69,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/index.ts
 	  Imported via 'b' from file 'src/index.ts'
 	../B/src/bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-not-built-with-preserveSymlinks.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-not-built-with-preserveSymlinks.js
index f969c5b84e566..a9013a77c9bf3 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-not-built-with-preserveSymlinks.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-not-built-with-preserveSymlinks.js
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/index.ts
 	  Imported via 'b' from file 'src/index.ts'
 	../B/src/bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-not-built.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-not-built.js
index e60b86b81078d..04e4eb883df31 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-not-built.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-and-solution-is-not-built.js
@@ -69,7 +69,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/index.ts
 	  Imported via 'b' from file 'src/index.ts'
 	../B/src/bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-built-with-preserveSymlinks.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-built-with-preserveSymlinks.js
index 8b26d25ed154a..2f1e96760ad2a 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-built-with-preserveSymlinks.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-built-with-preserveSymlinks.js
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/index.ts
 	  Imported via '@issue/b' from file 'src/index.ts'
 	../B/src/bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-built.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-built.js
index 66046c4b53eb7..ef0145096da1f 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-built.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-built.js
@@ -69,7 +69,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/index.ts
 	  Imported via '@issue/b' from file 'src/index.ts'
 	../B/src/bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-not-built-with-preserveSymlinks.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-not-built-with-preserveSymlinks.js
index 8b26d25ed154a..2f1e96760ad2a 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-not-built-with-preserveSymlinks.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-not-built-with-preserveSymlinks.js
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/index.ts
 	  Imported via '@issue/b' from file 'src/index.ts'
 	../B/src/bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-not-built.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-not-built.js
index 66046c4b53eb7..ef0145096da1f 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-not-built.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-packageJson-has-types-field-and-has-index.ts-with-scoped-package-and-solution-is-not-built.js
@@ -69,7 +69,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/index.ts
 	  Imported via '@issue/b' from file 'src/index.ts'
 	../B/src/bar.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-built-with-preserveSymlinks.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-built-with-preserveSymlinks.js
index 7726579e91a68..9a61dfad25320 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-built-with-preserveSymlinks.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-built-with-preserveSymlinks.js
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/foo.ts
 	  Imported via 'b/lib/foo' from file 'src/test.ts'
 	../B/src/bar/foo.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-built.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-built.js
index f22cf5c905156..f6845aa802776 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-built.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-built.js
@@ -69,7 +69,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/foo.ts
 	  Imported via 'b/lib/foo' from file 'src/test.ts'
 	../B/src/bar/foo.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-not-built-with-preserveSymlinks.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-not-built-with-preserveSymlinks.js
index 7726579e91a68..9a61dfad25320 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-not-built-with-preserveSymlinks.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-not-built-with-preserveSymlinks.js
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/foo.ts
 	  Imported via 'b/lib/foo' from file 'src/test.ts'
 	../B/src/bar/foo.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-not-built.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-not-built.js
index f22cf5c905156..f6845aa802776 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-not-built.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-and-solution-is-not-built.js
@@ -69,7 +69,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/foo.ts
 	  Imported via 'b/lib/foo' from file 'src/test.ts'
 	../B/src/bar/foo.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-built-with-preserveSymlinks.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-built-with-preserveSymlinks.js
index 85a0c966f68a0..a77a219fa9442 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-built-with-preserveSymlinks.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-built-with-preserveSymlinks.js
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/foo.ts
 	  Imported via '@issue/b/lib/foo' from file 'src/test.ts'
 	../B/src/bar/foo.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-built.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-built.js
index 1ff4238c7230d..8cd1d9f315d28 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-built.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-built.js
@@ -69,7 +69,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/foo.ts
 	  Imported via '@issue/b/lib/foo' from file 'src/test.ts'
 	../B/src/bar/foo.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-not-built-with-preserveSymlinks.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-not-built-with-preserveSymlinks.js
index 85a0c966f68a0..a77a219fa9442 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-not-built-with-preserveSymlinks.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-not-built-with-preserveSymlinks.js
@@ -71,7 +71,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/foo.ts
 	  Imported via '@issue/b/lib/foo' from file 'src/test.ts'
 	../B/src/bar/foo.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-not-built.js b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-not-built.js
index 1ff4238c7230d..8cd1d9f315d28 100644
--- a/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-not-built.js
+++ b/tests/baselines/reference/tsserver/projectReferences/monorepo-like-with-symlinks-when-referencing-file-from-subFolder-with-scoped-package-and-solution-is-not-built.js
@@ -69,7 +69,7 @@ Project '/user/username/projects/myproject/packages/A/tsconfig.json' (Configured
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../B/src/foo.ts
 	  Imported via '@issue/b/lib/foo' from file 'src/test.ts'
 	../B/src/bar/foo.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-not-open-with-disableSourceOfProjectReferenceRedirect.js b/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-not-open-with-disableSourceOfProjectReferenceRedirect.js
index 6067b76e4445c..33ff2899bb102 100644
--- a/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-not-open-with-disableSourceOfProjectReferenceRedirect.js
+++ b/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-not-open-with-disableSourceOfProjectReferenceRedirect.js
@@ -55,7 +55,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.d.ts
 	  Output from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	class2.ts
@@ -119,7 +119,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.d.ts
 	  Output from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	../project1/class3.d.ts
@@ -171,7 +171,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.d.ts
 	  Output from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	class2.ts
@@ -216,7 +216,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.d.ts
 	  Output from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	../project1/class3.d.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-not-open.js b/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-not-open.js
index b49dd3463821d..b7dd8d659e8cd 100644
--- a/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-not-open.js
+++ b/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-not-open.js
@@ -54,7 +54,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.ts
 	  Source from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	class2.ts
@@ -88,7 +88,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.ts
 	  Source from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	../project1/class3.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-open-with-disableSourceOfProjectReferenceRedirect.js b/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-open-with-disableSourceOfProjectReferenceRedirect.js
index e17a9ec7915e3..7f2d161a7d719 100644
--- a/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-open-with-disableSourceOfProjectReferenceRedirect.js
+++ b/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-open-with-disableSourceOfProjectReferenceRedirect.js
@@ -55,7 +55,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.d.ts
 	  Output from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	class2.ts
@@ -92,7 +92,7 @@ Project '/user/username/projects/myproject/projects/project1/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	class1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -136,7 +136,7 @@ Project '/user/username/projects/myproject/projects/project1/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	class1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 	class3.ts
@@ -193,7 +193,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.d.ts
 	  Output from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	../project1/class3.d.ts
@@ -257,7 +257,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.d.ts
 	  Output from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	class2.ts
@@ -314,7 +314,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.d.ts
 	  Output from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	../project1/class3.d.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-open.js b/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-open.js
index 6d615c5d9cca1..e599b581ce232 100644
--- a/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-open.js
+++ b/tests/baselines/reference/tsserver/projectReferences/new-file-is-added-to-the-referenced-project-when-referenced-project-is-open.js
@@ -54,7 +54,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.ts
 	  Source from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	class2.ts
@@ -92,7 +92,7 @@ Project '/user/username/projects/myproject/projects/project1/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	class1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -132,7 +132,7 @@ Project '/user/username/projects/myproject/projects/project2/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../project1/class1.ts
 	  Source from referenced project '../project1/tsconfig.json' included because '--module' is specified as 'none'
 	../project1/class3.ts
@@ -152,7 +152,7 @@ Project '/user/username/projects/myproject/projects/project1/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	class1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 	class3.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/project-is-directly-referenced-by-solution.js b/tests/baselines/reference/tsserver/projectReferences/project-is-directly-referenced-by-solution.js
index 0491fc90397c8..733f44198e166 100644
--- a/tests/baselines/reference/tsserver/projectReferences/project-is-directly-referenced-by-solution.js
+++ b/tests/baselines/reference/tsserver/projectReferences/project-is-directly-referenced-by-solution.js
@@ -60,7 +60,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -201,7 +201,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -281,7 +281,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -537,7 +537,7 @@ Project '/user/username/projects/myproject/indirect3/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../target/src/helpers/functions.d.ts
 	  Imported via 'helpers/functions' from file '../target/src/main.d.ts'
 	../target/src/main.d.ts
@@ -571,7 +571,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -668,7 +668,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
diff --git a/tests/baselines/reference/tsserver/projectReferences/project-is-indirectly-referenced-by-solution.js b/tests/baselines/reference/tsserver/projectReferences/project-is-indirectly-referenced-by-solution.js
index 1fc3aca66dd00..f98f0ac84e7ad 100644
--- a/tests/baselines/reference/tsserver/projectReferences/project-is-indirectly-referenced-by-solution.js
+++ b/tests/baselines/reference/tsserver/projectReferences/project-is-indirectly-referenced-by-solution.js
@@ -100,7 +100,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -243,7 +243,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -363,7 +363,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -606,7 +606,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -637,7 +637,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect2.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -743,7 +743,7 @@ Project '/user/username/projects/myproject/indirect3/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../target/src/helpers/functions.d.ts
 	  Imported via 'helpers/functions' from file '../target/src/main.d.ts'
 	../target/src/main.d.ts
@@ -777,7 +777,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -797,7 +797,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -819,7 +819,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect2.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -960,7 +960,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -996,7 +996,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -1025,7 +1025,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect2.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/root-file-is-file-from-referenced-project-and-using-declaration-maps.js b/tests/baselines/reference/tsserver/projectReferences/root-file-is-file-from-referenced-project-and-using-declaration-maps.js
index 0730f12780e09..7b780c70d9461 100644
--- a/tests/baselines/reference/tsserver/projectReferences/root-file-is-file-from-referenced-project-and-using-declaration-maps.js
+++ b/tests/baselines/reference/tsserver/projectReferences/root-file-is-file-from-referenced-project-and-using-declaration-maps.js
@@ -39,7 +39,7 @@ Project '/user/username/projects/project/src/common/tsconfig.json' (Configured)
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	input/keyboard.ts
 	  Imported via 'common/input/keyboard' from file 'input/keyboard.test.ts'
 	  Matched by include pattern './**/*' in 'tsconfig.json'
@@ -116,7 +116,7 @@ Project '/user/username/projects/project/src/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../out/input/keyboard.d.ts
 	  Imported via 'common/input/keyboard' from file 'terminal.ts'
 	  Imported via 'common/input/keyboard' from file 'common/input/keyboard.test.ts'
diff --git a/tests/baselines/reference/tsserver/projectReferences/root-file-is-file-from-referenced-project.js b/tests/baselines/reference/tsserver/projectReferences/root-file-is-file-from-referenced-project.js
index 6c9ab0042f3ae..087b11925fd3f 100644
--- a/tests/baselines/reference/tsserver/projectReferences/root-file-is-file-from-referenced-project.js
+++ b/tests/baselines/reference/tsserver/projectReferences/root-file-is-file-from-referenced-project.js
@@ -39,7 +39,7 @@ Project '/user/username/projects/project/src/common/tsconfig.json' (Configured)
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	input/keyboard.ts
 	  Imported via 'common/input/keyboard' from file 'input/keyboard.test.ts'
 	  Matched by include pattern './**/*' in 'tsconfig.json'
@@ -115,7 +115,7 @@ Project '/user/username/projects/project/src/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	common/input/keyboard.ts
 	  Imported via 'common/input/keyboard' from file 'terminal.ts'
 	  Imported via 'common/input/keyboard' from file 'common/input/keyboard.test.ts'
diff --git a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-first-indirect-project-but-not-in-another-one.js b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-first-indirect-project-but-not-in-another-one.js
index 409f4ec3ab500..9ccdf36a3e7d8 100644
--- a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-first-indirect-project-but-not-in-another-one.js
+++ b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-first-indirect-project-but-not-in-another-one.js
@@ -96,7 +96,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -127,7 +127,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -250,7 +250,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -275,7 +275,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -395,7 +395,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -424,7 +424,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
diff --git a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-indirect-project.js b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-indirect-project.js
index 657f545b7bd0b..3ff42e8c78ea1 100644
--- a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-indirect-project.js
+++ b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set-in-indirect-project.js
@@ -74,7 +74,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -106,7 +106,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -230,7 +230,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -254,7 +254,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -354,7 +354,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -384,7 +384,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set.js b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set.js
index 7bacd99ea0871..777ac2ad63b24 100644
--- a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set.js
+++ b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-disables-looking-into-the-child-project-if-disableReferencedProjectLoad-is-set.js
@@ -54,7 +54,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -161,7 +161,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -240,7 +240,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-project-found-is-not-solution-but-references-open-file-through-project-reference.js b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-project-found-is-not-solution-but-references-open-file-through-project-reference.js
index 5e41243f1dbdc..557538b6f45e1 100644
--- a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-project-found-is-not-solution-but-references-open-file-through-project-reference.js
+++ b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-project-found-is-not-solution-but-references-open-file-through-project-reference.js
@@ -53,7 +53,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -82,7 +82,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -214,7 +214,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -235,7 +235,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -311,7 +311,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -338,7 +338,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -612,7 +612,7 @@ Project '/user/username/projects/myproject/indirect3/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../target/src/helpers/functions.d.ts
 	  Imported via 'helpers/functions' from file '../target/src/main.d.ts'
 	../target/src/main.d.ts
@@ -637,7 +637,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -658,7 +658,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -751,7 +751,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -778,7 +778,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
diff --git a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-project-is-indirectly-referenced-by-solution.js b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-project-is-indirectly-referenced-by-solution.js
index ae073122bf4a7..172371c9136b7 100644
--- a/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-project-is-indirectly-referenced-by-solution.js
+++ b/tests/baselines/reference/tsserver/projectReferences/solution-with-its-own-files-and-project-is-indirectly-referenced-by-solution.js
@@ -95,7 +95,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -126,7 +126,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -259,7 +259,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -284,7 +284,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -403,7 +403,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -432,7 +432,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -696,7 +696,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -735,7 +735,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect2.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -841,7 +841,7 @@ Project '/user/username/projects/myproject/indirect3/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../target/src/helpers/functions.d.ts
 	  Imported via 'helpers/functions' from file '../target/src/main.d.ts'
 	../target/src/main.d.ts
@@ -867,7 +867,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -890,7 +890,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -910,7 +910,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -932,7 +932,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect2.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -1071,7 +1071,7 @@ Project '/user/username/projects/myproject/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -1100,7 +1100,7 @@ Project '/user/username/projects/myproject/tsconfig-src.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	  Matched by include pattern './src/**/*' in 'tsconfig-src.json'
@@ -1135,7 +1135,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect1.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
@@ -1164,7 +1164,7 @@ Project '/user/username/projects/myproject/tsconfig-indirect2.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/helpers/functions.ts
 	  Imported via 'helpers/functions' from file 'src/main.ts'
 	src/main.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-as-object-literal-property-types.js b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-as-object-literal-property-types.js
index 4952ad577f57a..05dbc65c8940c 100644
--- a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-as-object-literal-property-types.js
+++ b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-as-object-literal-property-types.js
@@ -56,7 +56,7 @@ Project '/user/username/projects/solution/api/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../shared/src/index.ts
 	  Imported via "../../shared/dist" from file 'src/server.ts'
 	src/server.ts
@@ -99,7 +99,7 @@ Project '/user/username/projects/solution/shared/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/index.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
@@ -168,7 +168,7 @@ Project '/user/username/projects/solution/app/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../shared/src/index.ts
 	  Imported via "../../shared/dist" from file 'src/app.ts'
 	src/app.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-as-object-literal-property.js b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-as-object-literal-property.js
index a38fee1014521..002fd13a1027c 100644
--- a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-as-object-literal-property.js
+++ b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-as-object-literal-property.js
@@ -56,7 +56,7 @@ Project '/user/username/projects/solution/api/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../shared/src/index.ts
 	  Imported via "../../shared/dist" from file 'src/server.ts'
 	src/server.ts
@@ -99,7 +99,7 @@ Project '/user/username/projects/solution/shared/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/index.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-assignment.js b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-assignment.js
index 9d7bd0466e250..94d141350d905 100644
--- a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-assignment.js
+++ b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-arrow-function-assignment.js
@@ -56,7 +56,7 @@ Project '/user/username/projects/solution/api/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../shared/src/index.ts
 	  Imported via "../../shared/dist" from file 'src/server.ts'
 	src/server.ts
@@ -99,7 +99,7 @@ Project '/user/username/projects/solution/shared/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/index.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
@@ -168,7 +168,7 @@ Project '/user/username/projects/solution/app/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../shared/src/index.ts
 	  Imported via "../../shared/dist" from file 'src/app.ts'
 	src/app.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-method-of-class-expression.js b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-method-of-class-expression.js
index 08ead42ba29b1..90ba1f57746a1 100644
--- a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-method-of-class-expression.js
+++ b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-method-of-class-expression.js
@@ -56,7 +56,7 @@ Project '/user/username/projects/solution/api/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../shared/src/index.ts
 	  Imported via "../../shared/dist" from file 'src/server.ts'
 	src/server.ts
@@ -99,7 +99,7 @@ Project '/user/username/projects/solution/shared/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/index.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
@@ -168,7 +168,7 @@ Project '/user/username/projects/solution/app/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../shared/src/index.ts
 	  Imported via "../../shared/dist" from file 'src/app.ts'
 	src/app.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-object-literal-property.js b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-object-literal-property.js
index 4bad4c371a6fa..08dfbe0bb76f3 100644
--- a/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-object-literal-property.js
+++ b/tests/baselines/reference/tsserver/projectReferences/special-handling-of-localness-when-using-object-literal-property.js
@@ -56,7 +56,7 @@ Project '/user/username/projects/solution/api/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../shared/src/index.ts
 	  Imported via "../../shared/dist" from file 'src/server.ts'
 	src/server.ts
@@ -99,7 +99,7 @@ Project '/user/username/projects/solution/shared/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/index.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
@@ -168,7 +168,7 @@ Project '/user/username/projects/solution/app/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../shared/src/index.ts
 	  Imported via "../../shared/dist" from file 'src/app.ts'
 	src/app.ts
diff --git a/tests/baselines/reference/tsserver/projectReferences/when-files-from-two-projects-are-open-and-one-project-references.js b/tests/baselines/reference/tsserver/projectReferences/when-files-from-two-projects-are-open-and-one-project-references.js
index 4c42d2445d25b..f4b045872292a 100644
--- a/tests/baselines/reference/tsserver/projectReferences/when-files-from-two-projects-are-open-and-one-project-references.js
+++ b/tests/baselines/reference/tsserver/projectReferences/when-files-from-two-projects-are-open-and-one-project-references.js
@@ -242,7 +242,7 @@ Project '/user/username/projects/myproject/main/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/file1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -275,7 +275,7 @@ Project '/user/username/projects/myproject/core/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/file1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -313,7 +313,7 @@ Project '/user/username/projects/myproject/indirect/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/file1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -334,7 +334,7 @@ Project '/user/username/projects/myproject/coreRef1/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/file1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -355,7 +355,7 @@ Project '/user/username/projects/myproject/indirectDisabledChildLoad1/tsconfig.j
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/file1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -376,7 +376,7 @@ Project '/user/username/projects/myproject/indirectDisabledChildLoad2/tsconfig.j
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/file1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -397,7 +397,7 @@ Project '/user/username/projects/myproject/refToCoreRef3/tsconfig.json' (Configu
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/file1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -418,7 +418,7 @@ Project '/user/username/projects/myproject/coreRef3/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/file1.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projectReferences/when-the-referenced-projects-have-allowJs-and-emitDeclarationOnly.js b/tests/baselines/reference/tsserver/projectReferences/when-the-referenced-projects-have-allowJs-and-emitDeclarationOnly.js
index 37b36b07abe29..dc9685be6c87c 100644
--- a/tests/baselines/reference/tsserver/projectReferences/when-the-referenced-projects-have-allowJs-and-emitDeclarationOnly.js
+++ b/tests/baselines/reference/tsserver/projectReferences/when-the-referenced-projects-have-allowJs-and-emitDeclarationOnly.js
@@ -70,7 +70,7 @@ Project '/user/username/projects/myproject/packages/consumer/tsconfig.json' (Con
 
 
 	../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../emit-composite/src/testModule.js
 	  Imported via './testModule' from file '../emit-composite/src/index.js'
 	../emit-composite/src/index.js
diff --git a/tests/baselines/reference/tsserver/projectReferences/with-disableSolutionSearching-solution-and-siblings-are-not-loaded.js b/tests/baselines/reference/tsserver/projectReferences/with-disableSolutionSearching-solution-and-siblings-are-not-loaded.js
index af244659e889f..c979a5b84dd6f 100644
--- a/tests/baselines/reference/tsserver/projectReferences/with-disableSolutionSearching-solution-and-siblings-are-not-loaded.js
+++ b/tests/baselines/reference/tsserver/projectReferences/with-disableSolutionSearching-solution-and-siblings-are-not-loaded.js
@@ -33,7 +33,7 @@ Project '/user/username/projects/solution/compiler/tsconfig.json' (Configured)
 
 
 	../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	types.ts
 	  Part of 'files' list in tsconfig.json
 	program.ts
diff --git a/tests/baselines/reference/tsserver/projects/getting-errors-from-closed-script-info-does-not-throw-exception-because-of-getting-project-from-orphan-script-info.js b/tests/baselines/reference/tsserver/projects/getting-errors-from-closed-script-info-does-not-throw-exception-because-of-getting-project-from-orphan-script-info.js
index ab3c92b0b9a1d..d80fa072de0c4 100644
--- a/tests/baselines/reference/tsserver/projects/getting-errors-from-closed-script-info-does-not-throw-exception-because-of-getting-project-from-orphan-script-info.js
+++ b/tests/baselines/reference/tsserver/projects/getting-errors-from-closed-script-info-does-not-throw-exception-because-of-getting-project-from-orphan-script-info.js
@@ -27,7 +27,7 @@ Project '/a/b/tsconfig.json' (Configured)
 
 
 	../lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	app.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/projects/handles-delayed-directory-watch-invoke-on-file-creation.js b/tests/baselines/reference/tsserver/projects/handles-delayed-directory-watch-invoke-on-file-creation.js
index 306fe238706cd..fddcb0fa0e0c3 100644
--- a/tests/baselines/reference/tsserver/projects/handles-delayed-directory-watch-invoke-on-file-creation.js
+++ b/tests/baselines/reference/tsserver/projects/handles-delayed-directory-watch-invoke-on-file-creation.js
@@ -32,7 +32,7 @@ Project '/users/username/projects/project/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	b.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 	sub/a.ts
@@ -101,7 +101,7 @@ Project '/users/username/projects/project/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	b.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 	a.ts
@@ -167,7 +167,7 @@ Project '/users/username/projects/project/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	b.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 
@@ -273,7 +273,7 @@ Project '/users/username/projects/project/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	b.ts
 	  Matched by include pattern '**/*' in 'tsconfig.json'
 	sub/a.ts
diff --git a/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-compiles-from-sources.js b/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-compiles-from-sources.js
index a77bb2e51b5fe..cb3c63b45f1cb 100644
--- a/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-compiles-from-sources.js
+++ b/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-compiles-from-sources.js
@@ -45,7 +45,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/datetime/baseDate.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
@@ -103,7 +103,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../recognizers-text/dist/types/recognizers-text.d.ts
 	  Imported via "@microsoft/recognizers-text" from file 'src/datetime/baseDate.ts'
 	src/datetime/baseDate.ts
diff --git a/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-has-node_modules-setup-but-doesnt-have-modules-in-typings-folder-and-then-recompiles.js b/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-has-node_modules-setup-but-doesnt-have-modules-in-typings-folder-and-then-recompiles.js
index e34260a45bdb2..73d3cc01ddeed 100644
--- a/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-has-node_modules-setup-but-doesnt-have-modules-in-typings-folder-and-then-recompiles.js
+++ b/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-has-node_modules-setup-but-doesnt-have-modules-in-typings-folder-and-then-recompiles.js
@@ -45,7 +45,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/datetime/baseDate.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-recompiles-after-deleting-generated-folders.js b/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-recompiles-after-deleting-generated-folders.js
index 8358625f4853e..8135d10fc6a27 100644
--- a/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-recompiles-after-deleting-generated-folders.js
+++ b/tests/baselines/reference/tsserver/symLinks/module-resolution-when-project-recompiles-after-deleting-generated-folders.js
@@ -41,7 +41,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../recognizers-text/dist/types/recognizers-text.d.ts
 	  Imported via "@microsoft/recognizers-text" from file 'src/datetime/baseDate.ts'
 	src/datetime/baseDate.ts
@@ -93,7 +93,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/datetime/baseDate.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
diff --git a/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-compiles-from-sources.js b/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-compiles-from-sources.js
index 170cbacc4d17f..d7f9852e16033 100644
--- a/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-compiles-from-sources.js
+++ b/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-compiles-from-sources.js
@@ -57,7 +57,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/datetime/baseDate.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
@@ -128,7 +128,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../recognizers-text/dist/types/recognizers-text.d.ts
 	  Imported via "@microsoft/recognizers-text" from file 'src/datetime/baseDate.ts'
 	src/datetime/baseDate.ts
diff --git a/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-has-node_modules-setup-but-doesnt-have-modules-in-typings-folder-and-then-recompiles.js b/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-has-node_modules-setup-but-doesnt-have-modules-in-typings-folder-and-then-recompiles.js
index cd7d0a69f8dfb..c0d72dafd98fb 100644
--- a/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-has-node_modules-setup-but-doesnt-have-modules-in-typings-folder-and-then-recompiles.js
+++ b/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-has-node_modules-setup-but-doesnt-have-modules-in-typings-folder-and-then-recompiles.js
@@ -57,7 +57,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/datetime/baseDate.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
@@ -120,7 +120,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../recognizers-text/dist/types/recognizers-text.d.ts
 	  Imported via "@microsoft/recognizers-text" from file 'src/datetime/baseDate.ts'
 	src/datetime/baseDate.ts
diff --git a/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-recompiles-after-deleting-generated-folders.js b/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-recompiles-after-deleting-generated-folders.js
index b170b793afd68..03d1e2e66885c 100644
--- a/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-recompiles-after-deleting-generated-folders.js
+++ b/tests/baselines/reference/tsserver/symLinks/module-resolution-with-path-mapping-when-project-recompiles-after-deleting-generated-folders.js
@@ -47,7 +47,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../recognizers-text/dist/types/recognizers-text.d.ts
 	  Imported via "@microsoft/recognizers-text" from file 'src/datetime/baseDate.ts'
 	src/datetime/baseDate.ts
@@ -105,7 +105,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	src/datetime/baseDate.ts
 	  Matched by include pattern 'src' in 'tsconfig.json'
 
@@ -176,7 +176,7 @@ Project '/users/username/projects/myproject/javascript/packages/recognizers-date
 
 
 	../../../../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	../recognizers-text/dist/types/recognizers-text.d.ts
 	  Imported via "@microsoft/recognizers-text" from file 'src/datetime/baseDate.ts'
 	src/datetime/baseDate.ts
diff --git a/tests/baselines/reference/tsserver/symLinks/rename-in-common-file-renames-all-project.js b/tests/baselines/reference/tsserver/symLinks/rename-in-common-file-renames-all-project.js
index 4911e8dd31f46..8c65341cf397e 100644
--- a/tests/baselines/reference/tsserver/symLinks/rename-in-common-file-renames-all-project.js
+++ b/tests/baselines/reference/tsserver/symLinks/rename-in-common-file-renames-all-project.js
@@ -31,7 +31,7 @@ Project '/users/username/projects/a/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	c/fc.ts
 	  Imported via "./c/fc" from file 'a.ts'
 	  Matched by include pattern '**/*' in 'tsconfig.json'
@@ -78,7 +78,7 @@ Project '/users/username/projects/b/tsconfig.json' (Configured)
 
 
 	../../../../a/lib/lib.d.ts
-	  Default library
+	  Default library for target 'es3'
 	c/fc.ts
 	  Imported via "./c/fc" from file 'b.ts'
 	  Matched by include pattern '**/*' in 'tsconfig.json'
diff --git a/tests/cases/conformance/node/nodeModules1.ts b/tests/cases/conformance/node/nodeModules1.ts
new file mode 100644
index 0000000000000..9d81258595ae8
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModules1.ts
@@ -0,0 +1,34 @@
+// @module: node12,nodenext
+// @filename: subfolder/index.ts
+// cjs format file
+const x = 1;
+export {x};
+// @filename: subfolder2/index.ts
+// cjs format file
+const x = 1;
+export {x};
+// @filename: subfolder2/another/index.ts
+// esm format file
+const x = 1;
+export {x};
+// @filename: index.ts
+// esm format file
+const x = 1;
+export {x};
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: subfolder2/package.json
+{
+}
+// @filename: subfolder2/another/package.json
+{
+    "type": "module"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesDynamicImport.ts b/tests/cases/conformance/node/nodeModulesDynamicImport.ts
new file mode 100644
index 0000000000000..75a5dcfc88cfb
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesDynamicImport.ts
@@ -0,0 +1,23 @@
+// @module: node12,nodenext
+// @filename: subfolder/index.ts
+// cjs format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+// @filename: index.ts
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesExportAssignments.ts b/tests/cases/conformance/node/nodeModulesExportAssignments.ts
new file mode 100644
index 0000000000000..ba604d85090ac
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesExportAssignments.ts
@@ -0,0 +1,19 @@
+// @module: node12,nodenext
+// @filename: subfolder/index.ts
+// cjs format file
+const a = {};
+export = a;
+// @filename: index.ts
+// esm format file
+const a = {};
+export = a;
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts b/tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts
new file mode 100644
index 0000000000000..5f708e1454c7b
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts
@@ -0,0 +1,25 @@
+// @module: node12,nodenext
+// @filename: subfolder/index.ts
+// cjs format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+// @filename: index.ts
+// esm format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesImportAssignments.ts b/tests/cases/conformance/node/nodeModulesImportAssignments.ts
new file mode 100644
index 0000000000000..d89c23438256a
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesImportAssignments.ts
@@ -0,0 +1,30 @@
+// @module: node12,nodenext
+// @filename: subfolder/index.ts
+// cjs format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+// @filename: index.ts
+// esm format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+// @filename: file.ts
+// esm format file
+const __require = null;
+const _createRequire = null;
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts
new file mode 100644
index 0000000000000..95f3830e818fa
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts
@@ -0,0 +1,30 @@
+// @module: node12,nodenext
+// @importHelpers: true
+// @filename: subfolder/index.ts
+// cjs format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+// @filename: index.ts
+// esm format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts
new file mode 100644
index 0000000000000..f018d86e63848
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts
@@ -0,0 +1,26 @@
+// @module: node12,nodenext
+// @importHelpers: true
+// @filename: subfolder/index.ts
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+// @filename: index.ts
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts
new file mode 100644
index 0000000000000..b661affe17a2c
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts
@@ -0,0 +1,24 @@
+// @module: node12,nodenext
+// @importHelpers: true
+// @filename: subfolder/index.ts
+// cjs format file
+export {default} from "fs";
+// @filename: index.ts
+// esm format file
+export {default} from "fs";
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesImportMeta.ts b/tests/cases/conformance/node/nodeModulesImportMeta.ts
new file mode 100644
index 0000000000000..ea83d1b33b3b3
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesImportMeta.ts
@@ -0,0 +1,19 @@
+// @module: node12,nodenext
+// @filename: subfolder/index.ts
+// cjs format file
+const x = import.meta.url;
+export {x};
+// @filename: index.ts
+// esm format file
+const x = import.meta.url;
+export {x};
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts b/tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts
new file mode 100644
index 0000000000000..8505ee4775096
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts
@@ -0,0 +1,33 @@
+// @module: node12,nodenext
+// @filename: subfolder/index.ts
+// cjs format file
+import {h} from "../index.js";
+import mod = require("../index.js");
+import {f as _f} from "./index.js";
+import mod2 = require("./index.js");
+export async function f() {
+    const mod3 = await import ("../index.js");
+    const mod4 = await import ("./index.js");
+    h();
+}
+// @filename: index.ts
+// esm format file
+import {h as _h} from "./index.js";
+import mod = require("./index.js");
+import {f} from "./subfolder/index.js";
+import mod2 = require("./subfolder/index.js");
+export async function h() {
+    const mod3 = await import ("./index.js");
+    const mod4 = await import ("./subfolder/index.js");
+    f();
+}
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModulesTopLevelAwait.ts b/tests/cases/conformance/node/nodeModulesTopLevelAwait.ts
new file mode 100644
index 0000000000000..4c950c0072f1d
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesTopLevelAwait.ts
@@ -0,0 +1,21 @@
+// @module: node12,nodenext
+// @filename: subfolder/index.ts
+// cjs format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+// @filename: index.ts
+// esm format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file

From 34812f09ba623ed1ee14a779f6da697de2d19e69 Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Mon, 7 Jun 2021 21:28:21 -0700
Subject: [PATCH 2/9] Add allowJs and declaration emit enabled tests

---
 src/compiler/checker.ts                       | 26 ++++++-
 .../reference/nodeModules1(module=node12).js  | 14 ++++
 .../nodeModules1(module=nodenext).js          | 14 ++++
 .../nodeModulesAllowJs1(module=node12).js     | 68 +++++++++++++++++++
 ...nodeModulesAllowJs1(module=node12).symbols | 32 +++++++++
 .../nodeModulesAllowJs1(module=node12).types  | 36 ++++++++++
 .../nodeModulesAllowJs1(module=nodenext).js   | 68 +++++++++++++++++++
 ...deModulesAllowJs1(module=nodenext).symbols | 32 +++++++++
 ...nodeModulesAllowJs1(module=nodenext).types | 36 ++++++++++
 ...ulesAllowJsDynamicImport(module=node12).js | 45 ++++++++++++
 ...llowJsDynamicImport(module=node12).symbols | 22 ++++++
 ...sAllowJsDynamicImport(module=node12).types | 26 +++++++
 ...esAllowJsDynamicImport(module=nodenext).js | 45 ++++++++++++
 ...owJsDynamicImport(module=nodenext).symbols | 22 ++++++
 ...llowJsDynamicImport(module=nodenext).types | 26 +++++++
 ...ExportAssignment(module=node12).errors.txt | 41 +++++++++++
 ...sAllowJsExportAssignment(module=node12).js | 61 +++++++++++++++++
 ...wJsExportAssignment(module=node12).symbols | 36 ++++++++++
 ...lowJsExportAssignment(module=node12).types | 45 ++++++++++++
 ...portAssignment(module=nodenext).errors.txt | 41 +++++++++++
 ...llowJsExportAssignment(module=nodenext).js | 61 +++++++++++++++++
 ...sExportAssignment(module=nodenext).symbols | 36 ++++++++++
 ...wJsExportAssignment(module=nodenext).types | 45 ++++++++++++
 ...edNameCollisions(module=node12).errors.txt | 38 +++++++++++
 ...sGeneratedNameCollisions(module=node12).js | 62 +++++++++++++++++
 ...ratedNameCollisions(module=node12).symbols | 38 +++++++++++
 ...neratedNameCollisions(module=node12).types | 42 ++++++++++++
 ...NameCollisions(module=nodenext).errors.txt | 38 +++++++++++
 ...eneratedNameCollisions(module=nodenext).js | 62 +++++++++++++++++
 ...tedNameCollisions(module=nodenext).symbols | 38 +++++++++++
 ...ratedNameCollisions(module=nodenext).types | 42 ++++++++++++
 ...ImportAssignment(module=node12).errors.txt | 49 +++++++++++++
 ...sAllowJsImportAssignment(module=node12).js | 68 +++++++++++++++++++
 ...wJsImportAssignment(module=node12).symbols | 43 ++++++++++++
 ...lowJsImportAssignment(module=node12).types | 51 ++++++++++++++
 ...portAssignment(module=nodenext).errors.txt | 49 +++++++++++++
 ...llowJsImportAssignment(module=nodenext).js | 68 +++++++++++++++++++
 ...sImportAssignment(module=nodenext).symbols | 43 ++++++++++++
 ...wJsImportAssignment(module=nodenext).types | 51 ++++++++++++++
 ...lpersCollisions1(module=node12).errors.txt | 36 ++++++++++
 ...ImportHelpersCollisions1(module=node12).js | 52 ++++++++++++++
 ...tHelpersCollisions1(module=node12).symbols | 40 +++++++++++
 ...ortHelpersCollisions1(module=node12).types | 48 +++++++++++++
 ...ersCollisions1(module=nodenext).errors.txt | 36 ++++++++++
 ...portHelpersCollisions1(module=nodenext).js | 52 ++++++++++++++
 ...elpersCollisions1(module=nodenext).symbols | 40 +++++++++++
 ...tHelpersCollisions1(module=nodenext).types | 48 +++++++++++++
 ...lpersCollisions2(module=node12).errors.txt | 32 +++++++++
 ...ImportHelpersCollisions2(module=node12).js | 48 +++++++++++++
 ...tHelpersCollisions2(module=node12).symbols | 22 ++++++
 ...ortHelpersCollisions2(module=node12).types | 22 ++++++
 ...ersCollisions2(module=nodenext).errors.txt | 32 +++++++++
 ...portHelpersCollisions2(module=nodenext).js | 48 +++++++++++++
 ...elpersCollisions2(module=nodenext).symbols | 22 ++++++
 ...tHelpersCollisions2(module=nodenext).types | 22 ++++++
 ...lpersCollisions3(module=node12).errors.txt | 31 +++++++++
 ...ImportHelpersCollisions3(module=node12).js | 54 +++++++++++++++
 ...tHelpersCollisions3(module=node12).symbols | 36 ++++++++++
 ...ortHelpersCollisions3(module=node12).types | 36 ++++++++++
 ...ersCollisions3(module=nodenext).errors.txt | 31 +++++++++
 ...portHelpersCollisions3(module=nodenext).js | 54 +++++++++++++++
 ...elpersCollisions3(module=nodenext).symbols | 36 ++++++++++
 ...tHelpersCollisions3(module=nodenext).types | 36 ++++++++++
 ...llowJsImportMeta(module=node12).errors.txt | 23 +++++++
 ...ModulesAllowJsImportMeta(module=node12).js | 38 +++++++++++
 ...esAllowJsImportMeta(module=node12).symbols | 20 ++++++
 ...ulesAllowJsImportMeta(module=node12).types | 24 +++++++
 ...owJsImportMeta(module=nodenext).errors.txt | 23 +++++++
 ...dulesAllowJsImportMeta(module=nodenext).js | 38 +++++++++++
 ...AllowJsImportMeta(module=nodenext).symbols | 20 ++++++
 ...esAllowJsImportMeta(module=nodenext).types | 24 +++++++
 ...ronousCallErrors(module=node12).errors.txt | 55 +++++++++++++++
 ...wJsSynchronousCallErrors(module=node12).js | 60 ++++++++++++++++
 ...nchronousCallErrors(module=node12).symbols | 58 ++++++++++++++++
 ...SynchronousCallErrors(module=node12).types | 68 +++++++++++++++++++
 ...nousCallErrors(module=nodenext).errors.txt | 55 +++++++++++++++
 ...sSynchronousCallErrors(module=nodenext).js | 60 ++++++++++++++++
 ...hronousCallErrors(module=nodenext).symbols | 58 ++++++++++++++++
 ...nchronousCallErrors(module=nodenext).types | 68 +++++++++++++++++++
 ...wJsTopLevelAwait(module=node12).errors.txt | 34 ++++++++++
 ...ulesAllowJsTopLevelAwait(module=node12).js | 42 ++++++++++++
 ...llowJsTopLevelAwait(module=node12).symbols | 22 ++++++
 ...sAllowJsTopLevelAwait(module=node12).types | 28 ++++++++
 ...sTopLevelAwait(module=nodenext).errors.txt | 28 ++++++++
 ...esAllowJsTopLevelAwait(module=nodenext).js | 42 ++++++++++++
 ...owJsTopLevelAwait(module=nodenext).symbols | 22 ++++++
 ...llowJsTopLevelAwait(module=nodenext).types | 28 ++++++++
 ...nodeModulesDynamicImport(module=node12).js |  6 ++
 ...deModulesDynamicImport(module=nodenext).js |  6 ++
 ...ModulesExportAssignments(module=node12).js |  8 +++
 ...dulesExportAssignments(module=nodenext).js |  8 +++
 ...sGeneratedNameCollisions(module=node12).js | 16 +++++
 ...eneratedNameCollisions(module=nodenext).js | 16 +++++
 ...ModulesImportAssignments(module=node12).js |  8 +++
 ...dulesImportAssignments(module=nodenext).js |  8 +++
 ...sImportHelpersCollisions(module=node12).js |  6 ++
 ...mportHelpersCollisions(module=nodenext).js |  6 ++
 ...ImportHelpersCollisions2(module=node12).js |  8 +++
 ...portHelpersCollisions2(module=nodenext).js |  8 +++
 ...ImportHelpersCollisions3(module=node12).js |  6 ++
 ...portHelpersCollisions3(module=nodenext).js |  6 ++
 .../nodeModulesImportMeta(module=node12).js   |  8 +++
 .../nodeModulesImportMeta(module=nodenext).js |  8 +++
 ...lesSynchronousCallErrors(module=node12).js |  6 ++
 ...sSynchronousCallErrors(module=nodenext).js |  6 ++
 ...nodeModulesTopLevelAwait(module=node12).js |  8 +++
 ...deModulesTopLevelAwait(module=nodenext).js |  8 +++
 .../node/allowJs/nodeModulesAllowJs1.ts       | 38 +++++++++++
 .../nodeModulesAllowJsDynamicImport.ts        | 27 ++++++++
 .../nodeModulesAllowJsExportAssignment.ts     | 32 +++++++++
 ...deModulesAllowJsGeneratedNameCollisions.ts | 29 ++++++++
 .../nodeModulesAllowJsImportAssignment.ts     | 34 ++++++++++
 ...eModulesAllowJsImportHelpersCollisions1.ts | 34 ++++++++++
 ...eModulesAllowJsImportHelpersCollisions2.ts | 30 ++++++++
 ...eModulesAllowJsImportHelpersCollisions3.ts | 32 +++++++++
 .../allowJs/nodeModulesAllowJsImportMeta.ts   | 23 +++++++
 ...nodeModulesAllowJsSynchronousCallErrors.ts | 37 ++++++++++
 .../nodeModulesAllowJsTopLevelAwait.ts        | 25 +++++++
 tests/cases/conformance/node/nodeModules1.ts  |  1 +
 .../node/nodeModulesDynamicImport.ts          |  1 +
 .../node/nodeModulesExportAssignments.ts      |  1 +
 .../nodeModulesGeneratedNameCollisions.ts     |  1 +
 .../node/nodeModulesImportAssignments.ts      |  1 +
 .../nodeModulesImportHelpersCollisions.ts     |  1 +
 .../nodeModulesImportHelpersCollisions2.ts    |  1 +
 .../nodeModulesImportHelpersCollisions3.ts    |  1 +
 .../conformance/node/nodeModulesImportMeta.ts |  1 +
 .../node/nodeModulesSynchronousCallErrors.ts  |  1 +
 .../node/nodeModulesTopLevelAwait.ts          |  1 +
 129 files changed, 4023 insertions(+), 1 deletion(-)
 create mode 100644 tests/baselines/reference/nodeModulesAllowJs1(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJs1(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJs1(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).types
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsDynamicImport.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsExportAssignment.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsGeneratedNameCollisions.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportAssignment.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions1.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions2.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions3.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportMeta.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsSynchronousCallErrors.ts
 create mode 100644 tests/cases/conformance/node/allowJs/nodeModulesAllowJsTopLevelAwait.ts

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 9b8cce1ccc148..70196b6da2add 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -7142,6 +7142,28 @@ namespace ts {
                     ), symbol.declarations && filter(symbol.declarations, d => isClassDeclaration(d) || isClassExpression(d))[0]), modifierFlags);
                 }
 
+                function getSomeTargetNameFromDeclarations(declarations: Declaration[] | undefined) {
+                    return firstDefined(declarations, d => {
+                        if (isImportSpecifier(d) || isExportSpecifier(d)) {
+                            return idText(d.propertyName || d.name);
+                        }
+                        if (isBinaryExpression(d) || isExportAssignment(d)) {
+                            const expression = isExportAssignment(d) ? d.expression : d.right;
+                            if (isPropertyAccessExpression(expression)) {
+                                return idText(expression.name);
+                            }
+                        }
+                        if (isAliasSymbolDeclaration(d)) {
+                            // This is... heuristic, at best. But it's probably better than always printing the name of the shorthand ambient module.
+                            const name = getNameOfDeclaration(d);
+                            if (name && isIdentifier(name)) {
+                                return idText(name);
+                            }
+                        }
+                        return undefined;
+                    });
+                }
+
                 function serializeAsAlias(symbol: Symbol, localName: string, modifierFlags: ModifierFlags) {
                     // synthesize an alias, eg `export { symbolName as Name }`
                     // need to mark the alias `symbol` points at
@@ -7152,7 +7174,9 @@ namespace ts {
                     if (!target) {
                         return;
                     }
-                    let verbatimTargetName = unescapeLeadingUnderscores(target.escapedName);
+                    // If `target` refers to a shorthand module symbol, the name we're trying to pull out isn;t recoverable from the target symbol
+                    // In such a scenario, we must fall back to looking for an alias declaration on `symbol` and pulling the target name from that
+                    let verbatimTargetName = isShorthandAmbientModuleSymbol(target) && getSomeTargetNameFromDeclarations(symbol.declarations) || unescapeLeadingUnderscores(target.escapedName);
                     if (verbatimTargetName === InternalSymbolName.ExportEquals && (getESModuleInterop(compilerOptions) || compilerOptions.allowSyntheticDefaultImports)) {
                         // target refers to an `export=` symbol that was hoisted into a synthetic default - rename here to match
                         verbatimTargetName = InternalSymbolName.Default;
diff --git a/tests/baselines/reference/nodeModules1(module=node12).js b/tests/baselines/reference/nodeModules1(module=node12).js
index 3742bb13c5f2a..1acae5c9aab3b 100644
--- a/tests/baselines/reference/nodeModules1(module=node12).js
+++ b/tests/baselines/reference/nodeModules1(module=node12).js
@@ -56,3 +56,17 @@ export { x };
 // esm format file
 const x = 1;
 export { x };
+
+
+//// [index.d.ts]
+declare const x = 1;
+export { x };
+//// [index.d.ts]
+declare const x = 1;
+export { x };
+//// [index.d.ts]
+declare const x = 1;
+export { x };
+//// [index.d.ts]
+declare const x = 1;
+export { x };
diff --git a/tests/baselines/reference/nodeModules1(module=nodenext).js b/tests/baselines/reference/nodeModules1(module=nodenext).js
index 3742bb13c5f2a..1acae5c9aab3b 100644
--- a/tests/baselines/reference/nodeModules1(module=nodenext).js
+++ b/tests/baselines/reference/nodeModules1(module=nodenext).js
@@ -56,3 +56,17 @@ export { x };
 // esm format file
 const x = 1;
 export { x };
+
+
+//// [index.d.ts]
+declare const x = 1;
+export { x };
+//// [index.d.ts]
+declare const x = 1;
+export { x };
+//// [index.d.ts]
+declare const x = 1;
+export { x };
+//// [index.d.ts]
+declare const x = 1;
+export { x };
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).js b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).js
new file mode 100644
index 0000000000000..358104e5f6a62
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).js
@@ -0,0 +1,68 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts] ////
+
+//// [index.js]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.js]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.js]
+// esm format file
+const x = 1;
+export {x};
+//// [index.js]
+// esm format file
+const x = 1;
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [package.json]
+{
+}
+//// [package.json]
+{
+    "type": "module"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = 1;
+export { x };
+//// [index.js]
+// esm format file
+const x = 1;
+export { x };
+
+
+//// [index.d.ts]
+export const x: 1;
+//// [index.d.ts]
+export const x: 1;
+//// [index.d.ts]
+export const x: 1;
+//// [index.d.ts]
+export const x: 1;
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).symbols
new file mode 100644
index 0000000000000..99bfb2a40ff73
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).symbols
@@ -0,0 +1,32 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder2/index.js ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.js ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).types b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).types
new file mode 100644
index 0000000000000..bb0713313ec99
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).types
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder2/index.js ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.js ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).js
new file mode 100644
index 0000000000000..358104e5f6a62
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).js
@@ -0,0 +1,68 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts] ////
+
+//// [index.js]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.js]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.js]
+// esm format file
+const x = 1;
+export {x};
+//// [index.js]
+// esm format file
+const x = 1;
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [package.json]
+{
+}
+//// [package.json]
+{
+    "type": "module"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = 1;
+export { x };
+//// [index.js]
+// esm format file
+const x = 1;
+export { x };
+
+
+//// [index.d.ts]
+export const x: 1;
+//// [index.d.ts]
+export const x: 1;
+//// [index.d.ts]
+export const x: 1;
+//// [index.d.ts]
+export const x: 1;
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).symbols
new file mode 100644
index 0000000000000..99bfb2a40ff73
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).symbols
@@ -0,0 +1,32 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder2/index.js ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.js ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).types
new file mode 100644
index 0000000000000..bb0713313ec99
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).types
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder2/index.js ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.js ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).js
new file mode 100644
index 0000000000000..471912e1192d9
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).js
@@ -0,0 +1,45 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsDynamicImport.ts] ////
+
+//// [index.js]
+// cjs format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+//// [index.js]
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.main = void 0;
+// cjs format file
+async function main() {
+    const { readFile } = await import("fs");
+}
+exports.main = main;
+//// [index.js]
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+
+
+//// [index.d.ts]
+export function main(): Promise<void>;
+//// [index.d.ts]
+export function main(): Promise<void>;
diff --git a/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).symbols
new file mode 100644
index 0000000000000..0b0c85a01f192
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+export async function main() {
+>main : Symbol(main, Decl(index.js, 0, 0))
+
+    const { readFile } = await import("fs");
+>readFile : Symbol(readFile, Decl(index.js, 2, 11))
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+}
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export async function main() {
+>main : Symbol(main, Decl(index.js, 0, 0))
+
+    const { readFile } = await import("fs");
+>readFile : Symbol(readFile, Decl(index.js, 2, 11))
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+}
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).types
new file mode 100644
index 0000000000000..650fcf3a63733
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=node12).types
@@ -0,0 +1,26 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+export async function main() {
+>main : () => Promise<void>
+
+    const { readFile } = await import("fs");
+>readFile : any
+>await import("fs") : any
+>import("fs") : Promise<any>
+>"fs" : "fs"
+}
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export async function main() {
+>main : () => Promise<void>
+
+    const { readFile } = await import("fs");
+>readFile : any
+>await import("fs") : any
+>import("fs") : Promise<any>
+>"fs" : "fs"
+}
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).js
new file mode 100644
index 0000000000000..471912e1192d9
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).js
@@ -0,0 +1,45 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsDynamicImport.ts] ////
+
+//// [index.js]
+// cjs format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+//// [index.js]
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.main = void 0;
+// cjs format file
+async function main() {
+    const { readFile } = await import("fs");
+}
+exports.main = main;
+//// [index.js]
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+
+
+//// [index.d.ts]
+export function main(): Promise<void>;
+//// [index.d.ts]
+export function main(): Promise<void>;
diff --git a/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).symbols
new file mode 100644
index 0000000000000..0b0c85a01f192
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+export async function main() {
+>main : Symbol(main, Decl(index.js, 0, 0))
+
+    const { readFile } = await import("fs");
+>readFile : Symbol(readFile, Decl(index.js, 2, 11))
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+}
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export async function main() {
+>main : Symbol(main, Decl(index.js, 0, 0))
+
+    const { readFile } = await import("fs");
+>readFile : Symbol(readFile, Decl(index.js, 2, 11))
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+}
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).types
new file mode 100644
index 0000000000000..650fcf3a63733
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsDynamicImport(module=nodenext).types
@@ -0,0 +1,26 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+export async function main() {
+>main : () => Promise<void>
+
+    const { readFile } = await import("fs");
+>readFile : any
+>await import("fs") : any
+>import("fs") : Promise<any>
+>"fs" : "fs"
+}
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export async function main() {
+>main : () => Promise<void>
+
+    const { readFile } = await import("fs");
+>readFile : any
+>await import("fs") : any
+>import("fs") : Promise<any>
+>"fs" : "fs"
+}
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).errors.txt
new file mode 100644
index 0000000000000..a0a3d489f44cb
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).errors.txt
@@ -0,0 +1,41 @@
+tests/cases/conformance/node/allowJs/file.js(4,1): error TS2580: Cannot find name 'module'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node`.
+tests/cases/conformance/node/allowJs/index.js(3,1): error TS1203: Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead.
+tests/cases/conformance/node/allowJs/index.js(3,1): error TS8003: 'export =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(3,1): error TS8003: 'export =' can only be used in TypeScript files.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (1 errors) ====
+    // cjs format file
+    const a = {};
+    export = a;
+    ~~~~~~~~~~~
+!!! error TS8003: 'export =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/subfolder/file.js (0 errors) ====
+    // cjs format file
+    const a = {};
+    module.exports = a;
+==== tests/cases/conformance/node/allowJs/index.js (2 errors) ====
+    // esm format file
+    const a = {};
+    export = a;
+    ~~~~~~~~~~~
+!!! error TS1203: Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead.
+    ~~~~~~~~~~~
+!!! error TS8003: 'export =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/file.js (1 errors) ====
+    // esm format file
+    import "fs";
+    const a = {};
+    module.exports = a;
+    ~~~~~~
+!!! error TS2580: Cannot find name 'module'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node`.
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).js
new file mode 100644
index 0000000000000..10d6da622e9a4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).js
@@ -0,0 +1,61 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsExportAssignment.ts] ////
+
+//// [index.js]
+// cjs format file
+const a = {};
+export = a;
+//// [file.js]
+// cjs format file
+const a = {};
+module.exports = a;
+//// [index.js]
+// esm format file
+const a = {};
+export = a;
+//// [file.js]
+// esm format file
+import "fs";
+const a = {};
+module.exports = a;
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+// cjs format file
+const a = {};
+module.exports = a;
+//// [file.js]
+// cjs format file
+const a = {};
+module.exports = a;
+//// [index.js]
+// esm format file
+const a = {};
+export {};
+//// [file.js]
+// esm format file
+import "fs";
+const a = {};
+module.exports = a;
+
+
+//// [index.d.ts]
+export = a;
+declare const a: {};
+//// [file.d.ts]
+export = a;
+declare const a: {};
+//// [index.d.ts]
+export = a;
+declare const a: {};
+//// [file.d.ts]
+export {};
diff --git a/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).symbols
new file mode 100644
index 0000000000000..4e0e3aed1a9a6
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).symbols
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const a = {};
+>a : Symbol(a, Decl(index.js, 1, 5))
+
+export = a;
+>a : Symbol(a, Decl(index.js, 1, 5))
+
+=== tests/cases/conformance/node/allowJs/subfolder/file.js ===
+// cjs format file
+const a = {};
+>a : Symbol(a, Decl(file.js, 1, 5))
+
+module.exports = a;
+>module.exports : Symbol(module.exports, Decl(file.js, 0, 0))
+>module : Symbol(export=, Decl(file.js, 1, 13))
+>exports : Symbol(export=, Decl(file.js, 1, 13))
+>a : Symbol(a, Decl(file.js, 1, 5))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const a = {};
+>a : Symbol(a, Decl(index.js, 1, 5))
+
+export = a;
+>a : Symbol(a, Decl(index.js, 1, 5))
+
+=== tests/cases/conformance/node/allowJs/file.js ===
+// esm format file
+import "fs";
+const a = {};
+>a : Symbol(a, Decl(file.js, 2, 5))
+
+module.exports = a;
+>a : Symbol(a, Decl(file.js, 2, 5))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).types
new file mode 100644
index 0000000000000..e6543212f665f
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=node12).types
@@ -0,0 +1,45 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const a = {};
+>a : {}
+>{} : {}
+
+export = a;
+>a : {}
+
+=== tests/cases/conformance/node/allowJs/subfolder/file.js ===
+// cjs format file
+const a = {};
+>a : {}
+>{} : {}
+
+module.exports = a;
+>module.exports = a : {}
+>module.exports : {}
+>module : { exports: {}; }
+>exports : {}
+>a : {}
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const a = {};
+>a : {}
+>{} : {}
+
+export = a;
+>a : {}
+
+=== tests/cases/conformance/node/allowJs/file.js ===
+// esm format file
+import "fs";
+const a = {};
+>a : {}
+>{} : {}
+
+module.exports = a;
+>module.exports = a : any
+>module.exports : any
+>module : any
+>exports : any
+>a : {}
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..a0a3d489f44cb
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).errors.txt
@@ -0,0 +1,41 @@
+tests/cases/conformance/node/allowJs/file.js(4,1): error TS2580: Cannot find name 'module'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node`.
+tests/cases/conformance/node/allowJs/index.js(3,1): error TS1203: Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead.
+tests/cases/conformance/node/allowJs/index.js(3,1): error TS8003: 'export =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(3,1): error TS8003: 'export =' can only be used in TypeScript files.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (1 errors) ====
+    // cjs format file
+    const a = {};
+    export = a;
+    ~~~~~~~~~~~
+!!! error TS8003: 'export =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/subfolder/file.js (0 errors) ====
+    // cjs format file
+    const a = {};
+    module.exports = a;
+==== tests/cases/conformance/node/allowJs/index.js (2 errors) ====
+    // esm format file
+    const a = {};
+    export = a;
+    ~~~~~~~~~~~
+!!! error TS1203: Export assignment cannot be used when targeting ECMAScript modules. Consider using 'export default' or another module format instead.
+    ~~~~~~~~~~~
+!!! error TS8003: 'export =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/file.js (1 errors) ====
+    // esm format file
+    import "fs";
+    const a = {};
+    module.exports = a;
+    ~~~~~~
+!!! error TS2580: Cannot find name 'module'. Do you need to install type definitions for node? Try `npm i --save-dev @types/node`.
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).js
new file mode 100644
index 0000000000000..10d6da622e9a4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).js
@@ -0,0 +1,61 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsExportAssignment.ts] ////
+
+//// [index.js]
+// cjs format file
+const a = {};
+export = a;
+//// [file.js]
+// cjs format file
+const a = {};
+module.exports = a;
+//// [index.js]
+// esm format file
+const a = {};
+export = a;
+//// [file.js]
+// esm format file
+import "fs";
+const a = {};
+module.exports = a;
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+// cjs format file
+const a = {};
+module.exports = a;
+//// [file.js]
+// cjs format file
+const a = {};
+module.exports = a;
+//// [index.js]
+// esm format file
+const a = {};
+export {};
+//// [file.js]
+// esm format file
+import "fs";
+const a = {};
+module.exports = a;
+
+
+//// [index.d.ts]
+export = a;
+declare const a: {};
+//// [file.d.ts]
+export = a;
+declare const a: {};
+//// [index.d.ts]
+export = a;
+declare const a: {};
+//// [file.d.ts]
+export {};
diff --git a/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).symbols
new file mode 100644
index 0000000000000..4e0e3aed1a9a6
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).symbols
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const a = {};
+>a : Symbol(a, Decl(index.js, 1, 5))
+
+export = a;
+>a : Symbol(a, Decl(index.js, 1, 5))
+
+=== tests/cases/conformance/node/allowJs/subfolder/file.js ===
+// cjs format file
+const a = {};
+>a : Symbol(a, Decl(file.js, 1, 5))
+
+module.exports = a;
+>module.exports : Symbol(module.exports, Decl(file.js, 0, 0))
+>module : Symbol(export=, Decl(file.js, 1, 13))
+>exports : Symbol(export=, Decl(file.js, 1, 13))
+>a : Symbol(a, Decl(file.js, 1, 5))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const a = {};
+>a : Symbol(a, Decl(index.js, 1, 5))
+
+export = a;
+>a : Symbol(a, Decl(index.js, 1, 5))
+
+=== tests/cases/conformance/node/allowJs/file.js ===
+// esm format file
+import "fs";
+const a = {};
+>a : Symbol(a, Decl(file.js, 2, 5))
+
+module.exports = a;
+>a : Symbol(a, Decl(file.js, 2, 5))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).types
new file mode 100644
index 0000000000000..e6543212f665f
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsExportAssignment(module=nodenext).types
@@ -0,0 +1,45 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const a = {};
+>a : {}
+>{} : {}
+
+export = a;
+>a : {}
+
+=== tests/cases/conformance/node/allowJs/subfolder/file.js ===
+// cjs format file
+const a = {};
+>a : {}
+>{} : {}
+
+module.exports = a;
+>module.exports = a : {}
+>module.exports : {}
+>module : { exports: {}; }
+>exports : {}
+>a : {}
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const a = {};
+>a : {}
+>{} : {}
+
+export = a;
+>a : {}
+
+=== tests/cases/conformance/node/allowJs/file.js ===
+// esm format file
+import "fs";
+const a = {};
+>a : {}
+>{} : {}
+
+module.exports = a;
+>module.exports = a : any
+>module.exports : any
+>module : any
+>exports : any
+>a : {}
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).errors.txt
new file mode 100644
index 0000000000000..84386984bc398
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).errors.txt
@@ -0,0 +1,38 @@
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,10): error TS2441: Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of a module.
+tests/cases/conformance/node/allowJs/subfolder/index.js(3,7): error TS2441: Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of a module.
+tests/cases/conformance/node/allowJs/subfolder/index.js(4,7): error TS2725: Class name cannot be 'Object' when targeting ES5 with module Node12.
+tests/cases/conformance/node/allowJs/subfolder/index.js(5,14): error TS1216: Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (4 errors) ====
+    // cjs format file
+    function require() {}
+             ~~~~~~~
+!!! error TS2441: Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of a module.
+    const exports = {};
+          ~~~~~~~
+!!! error TS2441: Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of a module.
+    class Object {}
+          ~~~~~~
+!!! error TS2725: Class name cannot be 'Object' when targeting ES5 with module Node12.
+    export const __esModule = false;
+                 ~~~~~~~~~~
+!!! error TS1216: Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules.
+    export {require, exports, Object};
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    function require() {}
+    const exports = {};
+    class Object {}
+    export const __esModule = false;
+    export {require, exports, Object};
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).js
new file mode 100644
index 0000000000000..3900870c747d2
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).js
@@ -0,0 +1,62 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsGeneratedNameCollisions.ts] ////
+
+//// [index.js]
+// cjs format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+//// [index.js]
+// esm format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Object = exports.exports = exports.require = exports.__esModule = void 0;
+// cjs format file
+function require() { }
+exports.require = require;
+const exports = {};
+exports.exports = exports;
+class Object {
+}
+exports.Object = Object;
+exports.__esModule = false;
+//// [index.js]
+// esm format file
+function require() { }
+const exports = {};
+class Object {
+}
+export const __esModule = false;
+export { require, exports, Object };
+
+
+//// [index.d.ts]
+export const __esModule: false;
+export function require(): void;
+export const exports: {};
+export class Object {
+}
+//// [index.d.ts]
+export const __esModule: false;
+export function require(): void;
+export const exports: {};
+export class Object {
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).symbols
new file mode 100644
index 0000000000000..8565d39212c8c
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).symbols
@@ -0,0 +1,38 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+function require() {}
+>require : Symbol(require, Decl(index.js, 0, 0))
+
+const exports = {};
+>exports : Symbol(exports, Decl(index.js, 2, 5))
+
+class Object {}
+>Object : Symbol(Object, Decl(index.js, 2, 19))
+
+export const __esModule = false;
+>__esModule : Symbol(__esModule, Decl(index.js, 4, 12))
+
+export {require, exports, Object};
+>require : Symbol(require, Decl(index.js, 5, 8))
+>exports : Symbol(exports, Decl(index.js, 5, 16))
+>Object : Symbol(Object, Decl(index.js, 5, 25))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+function require() {}
+>require : Symbol(require, Decl(index.js, 0, 0))
+
+const exports = {};
+>exports : Symbol(exports, Decl(index.js, 2, 5))
+
+class Object {}
+>Object : Symbol(Object, Decl(index.js, 2, 19))
+
+export const __esModule = false;
+>__esModule : Symbol(__esModule, Decl(index.js, 4, 12))
+
+export {require, exports, Object};
+>require : Symbol(require, Decl(index.js, 5, 8))
+>exports : Symbol(exports, Decl(index.js, 5, 16))
+>Object : Symbol(Object, Decl(index.js, 5, 25))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).types
new file mode 100644
index 0000000000000..a290eb3ca58e3
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=node12).types
@@ -0,0 +1,42 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+function require() {}
+>require : () => void
+
+const exports = {};
+>exports : {}
+>{} : {}
+
+class Object {}
+>Object : Object
+
+export const __esModule = false;
+>__esModule : false
+>false : false
+
+export {require, exports, Object};
+>require : () => void
+>exports : {}
+>Object : typeof Object
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+function require() {}
+>require : () => void
+
+const exports = {};
+>exports : {}
+>{} : {}
+
+class Object {}
+>Object : Object
+
+export const __esModule = false;
+>__esModule : false
+>false : false
+
+export {require, exports, Object};
+>require : () => void
+>exports : {}
+>Object : typeof Object
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..1e12bbbe4ed99
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).errors.txt
@@ -0,0 +1,38 @@
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,10): error TS2441: Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of a module.
+tests/cases/conformance/node/allowJs/subfolder/index.js(3,7): error TS2441: Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of a module.
+tests/cases/conformance/node/allowJs/subfolder/index.js(4,7): error TS2725: Class name cannot be 'Object' when targeting ES5 with module NodeNext.
+tests/cases/conformance/node/allowJs/subfolder/index.js(5,14): error TS1216: Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (4 errors) ====
+    // cjs format file
+    function require() {}
+             ~~~~~~~
+!!! error TS2441: Duplicate identifier 'require'. Compiler reserves name 'require' in top level scope of a module.
+    const exports = {};
+          ~~~~~~~
+!!! error TS2441: Duplicate identifier 'exports'. Compiler reserves name 'exports' in top level scope of a module.
+    class Object {}
+          ~~~~~~
+!!! error TS2725: Class name cannot be 'Object' when targeting ES5 with module NodeNext.
+    export const __esModule = false;
+                 ~~~~~~~~~~
+!!! error TS1216: Identifier expected. '__esModule' is reserved as an exported marker when transforming ECMAScript modules.
+    export {require, exports, Object};
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    function require() {}
+    const exports = {};
+    class Object {}
+    export const __esModule = false;
+    export {require, exports, Object};
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).js
new file mode 100644
index 0000000000000..3900870c747d2
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).js
@@ -0,0 +1,62 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsGeneratedNameCollisions.ts] ////
+
+//// [index.js]
+// cjs format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+//// [index.js]
+// esm format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Object = exports.exports = exports.require = exports.__esModule = void 0;
+// cjs format file
+function require() { }
+exports.require = require;
+const exports = {};
+exports.exports = exports;
+class Object {
+}
+exports.Object = Object;
+exports.__esModule = false;
+//// [index.js]
+// esm format file
+function require() { }
+const exports = {};
+class Object {
+}
+export const __esModule = false;
+export { require, exports, Object };
+
+
+//// [index.d.ts]
+export const __esModule: false;
+export function require(): void;
+export const exports: {};
+export class Object {
+}
+//// [index.d.ts]
+export const __esModule: false;
+export function require(): void;
+export const exports: {};
+export class Object {
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).symbols
new file mode 100644
index 0000000000000..8565d39212c8c
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).symbols
@@ -0,0 +1,38 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+function require() {}
+>require : Symbol(require, Decl(index.js, 0, 0))
+
+const exports = {};
+>exports : Symbol(exports, Decl(index.js, 2, 5))
+
+class Object {}
+>Object : Symbol(Object, Decl(index.js, 2, 19))
+
+export const __esModule = false;
+>__esModule : Symbol(__esModule, Decl(index.js, 4, 12))
+
+export {require, exports, Object};
+>require : Symbol(require, Decl(index.js, 5, 8))
+>exports : Symbol(exports, Decl(index.js, 5, 16))
+>Object : Symbol(Object, Decl(index.js, 5, 25))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+function require() {}
+>require : Symbol(require, Decl(index.js, 0, 0))
+
+const exports = {};
+>exports : Symbol(exports, Decl(index.js, 2, 5))
+
+class Object {}
+>Object : Symbol(Object, Decl(index.js, 2, 19))
+
+export const __esModule = false;
+>__esModule : Symbol(__esModule, Decl(index.js, 4, 12))
+
+export {require, exports, Object};
+>require : Symbol(require, Decl(index.js, 5, 8))
+>exports : Symbol(exports, Decl(index.js, 5, 16))
+>Object : Symbol(Object, Decl(index.js, 5, 25))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).types
new file mode 100644
index 0000000000000..a290eb3ca58e3
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsGeneratedNameCollisions(module=nodenext).types
@@ -0,0 +1,42 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+function require() {}
+>require : () => void
+
+const exports = {};
+>exports : {}
+>{} : {}
+
+class Object {}
+>Object : Object
+
+export const __esModule = false;
+>__esModule : false
+>false : false
+
+export {require, exports, Object};
+>require : () => void
+>exports : {}
+>Object : typeof Object
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+function require() {}
+>require : () => void
+
+const exports = {};
+>exports : {}
+>{} : {}
+
+class Object {}
+>Object : Object
+
+export const __esModule = false;
+>__esModule : false
+>false : false
+
+export {require, exports, Object};
+>require : () => void
+>exports : {}
+>Object : typeof Object
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).errors.txt
new file mode 100644
index 0000000000000..bbc352d7a78d5
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).errors.txt
@@ -0,0 +1,49 @@
+tests/cases/conformance/node/allowJs/file.js(4,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/file.js(6,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/index.js(2,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/index.js(4,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(4,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (2 errors) ====
+    // cjs format file
+    import fs = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    fs.readFile;
+    export import fs2 = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/index.js (2 errors) ====
+    // esm format file
+    import fs = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    fs.readFile;
+    export import fs2 = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/file.js (2 errors) ====
+    // esm format file
+    const __require = null;
+    const _createRequire = null;
+    import fs = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    fs.readFile;
+    export import fs2 = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/types.d.ts (0 errors) ====
+    declare module "fs";
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).js
new file mode 100644
index 0000000000000..1e97293cca863
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).js
@@ -0,0 +1,68 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportAssignment.ts] ////
+
+//// [index.js]
+// cjs format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [index.js]
+// esm format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [file.js]
+// esm format file
+const __require = null;
+const _createRequire = null;
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+// cjs format file
+const fs = require("fs");
+fs.readFile;
+exports.fs2 = require("fs");
+//// [index.js]
+import { createRequire as _createRequire } from "module";
+const __require = _createRequire(import.meta.url);
+// esm format file
+const fs = __require("fs");
+fs.readFile;
+const fs2 = __require("fs");
+export { fs2 };
+//// [file.js]
+import { createRequire as _createRequire_1 } from "module";
+const __require_1 = _createRequire_1(import.meta.url);
+// esm format file
+const __require = null;
+const _createRequire = null;
+const fs = __require_1("fs");
+fs.readFile;
+const fs2 = __require_1("fs");
+export { fs2 };
+
+
+//// [index.d.ts]
+/// <reference path="../../tests/cases/conformance/node/allowJs/types.d.ts" />
+import fs2 = require("fs");
+//// [index.d.ts]
+/// <reference path="../tests/cases/conformance/node/allowJs/types.d.ts" />
+import fs2 = require("fs");
+//// [file.d.ts]
+/// <reference path="../tests/cases/conformance/node/allowJs/types.d.ts" />
+import fs2 = require("fs");
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).symbols
new file mode 100644
index 0000000000000..11b3047ebcd76
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).symbols
@@ -0,0 +1,43 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import fs = require("fs");
+>fs : Symbol(fs, Decl(index.js, 0, 0))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.js, 0, 0))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(index.js, 2, 12))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import fs = require("fs");
+>fs : Symbol(fs, Decl(index.js, 0, 0))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.js, 0, 0))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(index.js, 2, 12))
+
+=== tests/cases/conformance/node/allowJs/file.js ===
+// esm format file
+const __require = null;
+>__require : Symbol(__require, Decl(file.js, 1, 5))
+
+const _createRequire = null;
+>_createRequire : Symbol(_createRequire, Decl(file.js, 2, 5))
+
+import fs = require("fs");
+>fs : Symbol(fs, Decl(file.js, 2, 28))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(file.js, 2, 28))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(file.js, 4, 12))
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).types
new file mode 100644
index 0000000000000..2720b1f1b7dc3
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=node12).types
@@ -0,0 +1,51 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/allowJs/file.js ===
+// esm format file
+const __require = null;
+>__require : any
+>null : null
+
+const _createRequire = null;
+>_createRequire : any
+>null : null
+
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..bbc352d7a78d5
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).errors.txt
@@ -0,0 +1,49 @@
+tests/cases/conformance/node/allowJs/file.js(4,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/file.js(6,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/index.js(2,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/index.js(4,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(4,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (2 errors) ====
+    // cjs format file
+    import fs = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    fs.readFile;
+    export import fs2 = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/index.js (2 errors) ====
+    // esm format file
+    import fs = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    fs.readFile;
+    export import fs2 = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/file.js (2 errors) ====
+    // esm format file
+    const __require = null;
+    const _createRequire = null;
+    import fs = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    fs.readFile;
+    export import fs2 = require("fs");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/types.d.ts (0 errors) ====
+    declare module "fs";
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).js
new file mode 100644
index 0000000000000..1e97293cca863
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).js
@@ -0,0 +1,68 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportAssignment.ts] ////
+
+//// [index.js]
+// cjs format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [index.js]
+// esm format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [file.js]
+// esm format file
+const __require = null;
+const _createRequire = null;
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+// cjs format file
+const fs = require("fs");
+fs.readFile;
+exports.fs2 = require("fs");
+//// [index.js]
+import { createRequire as _createRequire } from "module";
+const __require = _createRequire(import.meta.url);
+// esm format file
+const fs = __require("fs");
+fs.readFile;
+const fs2 = __require("fs");
+export { fs2 };
+//// [file.js]
+import { createRequire as _createRequire_1 } from "module";
+const __require_1 = _createRequire_1(import.meta.url);
+// esm format file
+const __require = null;
+const _createRequire = null;
+const fs = __require_1("fs");
+fs.readFile;
+const fs2 = __require_1("fs");
+export { fs2 };
+
+
+//// [index.d.ts]
+/// <reference path="../../tests/cases/conformance/node/allowJs/types.d.ts" />
+import fs2 = require("fs");
+//// [index.d.ts]
+/// <reference path="../tests/cases/conformance/node/allowJs/types.d.ts" />
+import fs2 = require("fs");
+//// [file.d.ts]
+/// <reference path="../tests/cases/conformance/node/allowJs/types.d.ts" />
+import fs2 = require("fs");
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).symbols
new file mode 100644
index 0000000000000..11b3047ebcd76
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).symbols
@@ -0,0 +1,43 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import fs = require("fs");
+>fs : Symbol(fs, Decl(index.js, 0, 0))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.js, 0, 0))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(index.js, 2, 12))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import fs = require("fs");
+>fs : Symbol(fs, Decl(index.js, 0, 0))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.js, 0, 0))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(index.js, 2, 12))
+
+=== tests/cases/conformance/node/allowJs/file.js ===
+// esm format file
+const __require = null;
+>__require : Symbol(__require, Decl(file.js, 1, 5))
+
+const _createRequire = null;
+>_createRequire : Symbol(_createRequire, Decl(file.js, 2, 5))
+
+import fs = require("fs");
+>fs : Symbol(fs, Decl(file.js, 2, 28))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(file.js, 2, 28))
+
+export import fs2 = require("fs");
+>fs2 : Symbol(fs2, Decl(file.js, 4, 12))
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).types
new file mode 100644
index 0000000000000..2720b1f1b7dc3
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportAssignment(module=nodenext).types
@@ -0,0 +1,51 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/allowJs/file.js ===
+// esm format file
+const __require = null;
+>__require : any
+>null : null
+
+const _createRequire = null;
+>_createRequire : any
+>null : null
+
+import fs = require("fs");
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+export import fs2 = require("fs");
+>fs2 : any
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).errors.txt
new file mode 100644
index 0000000000000..b75c1c1e6f563
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).errors.txt
@@ -0,0 +1,36 @@
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,9): error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+tests/cases/conformance/node/allowJs/subfolder/index.js(4,1): error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (2 errors) ====
+    // cjs format file
+    import {default as _fs} from "fs";
+            ~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    _fs.readFile;
+    import * as fs from "fs";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    fs.readFile;
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    import {default as _fs} from "fs";
+    _fs.readFile;
+    import * as fs from "fs";
+    fs.readFile;
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).js
new file mode 100644
index 0000000000000..4001d6f471cf5
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).js
@@ -0,0 +1,52 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions1.ts] ////
+
+//// [index.js]
+// cjs format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+//// [index.js]
+// esm format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const tslib_1 = require("tslib");
+// cjs format file
+const fs_1 = (0, tslib_1.__importDefault)(require("fs"));
+fs_1.default.readFile;
+const fs = (0, tslib_1.__importStar)(require("fs"));
+fs.readFile;
+//// [index.js]
+// esm format file
+import { default as _fs } from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+
+
+//// [index.d.ts]
+export {};
+//// [index.d.ts]
+export {};
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).symbols
new file mode 100644
index 0000000000000..3822c3fa16d4c
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).symbols
@@ -0,0 +1,40 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import {default as _fs} from "fs";
+>default : Symbol(_fs, Decl(types.d.ts, 0, 0))
+>_fs : Symbol(_fs, Decl(index.js, 1, 8))
+
+_fs.readFile;
+>_fs : Symbol(_fs, Decl(index.js, 1, 8))
+
+import * as fs from "fs";
+>fs : Symbol(fs, Decl(index.js, 3, 6))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.js, 3, 6))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import {default as _fs} from "fs";
+>default : Symbol(_fs, Decl(types.d.ts, 0, 0))
+>_fs : Symbol(_fs, Decl(index.js, 1, 8))
+
+_fs.readFile;
+>_fs : Symbol(_fs, Decl(index.js, 1, 8))
+
+import * as fs from "fs";
+>fs : Symbol(fs, Decl(index.js, 3, 6))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.js, 3, 6))
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).types
new file mode 100644
index 0000000000000..0b27106eae059
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=node12).types
@@ -0,0 +1,48 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import {default as _fs} from "fs";
+>default : any
+>_fs : any
+
+_fs.readFile;
+>_fs.readFile : any
+>_fs : any
+>readFile : any
+
+import * as fs from "fs";
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import {default as _fs} from "fs";
+>default : any
+>_fs : any
+
+_fs.readFile;
+>_fs.readFile : any
+>_fs : any
+>readFile : any
+
+import * as fs from "fs";
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..b75c1c1e6f563
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).errors.txt
@@ -0,0 +1,36 @@
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,9): error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+tests/cases/conformance/node/allowJs/subfolder/index.js(4,1): error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (2 errors) ====
+    // cjs format file
+    import {default as _fs} from "fs";
+            ~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    _fs.readFile;
+    import * as fs from "fs";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    fs.readFile;
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    import {default as _fs} from "fs";
+    _fs.readFile;
+    import * as fs from "fs";
+    fs.readFile;
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).js
new file mode 100644
index 0000000000000..4001d6f471cf5
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).js
@@ -0,0 +1,52 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions1.ts] ////
+
+//// [index.js]
+// cjs format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+//// [index.js]
+// esm format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const tslib_1 = require("tslib");
+// cjs format file
+const fs_1 = (0, tslib_1.__importDefault)(require("fs"));
+fs_1.default.readFile;
+const fs = (0, tslib_1.__importStar)(require("fs"));
+fs.readFile;
+//// [index.js]
+// esm format file
+import { default as _fs } from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+
+
+//// [index.d.ts]
+export {};
+//// [index.d.ts]
+export {};
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).symbols
new file mode 100644
index 0000000000000..3822c3fa16d4c
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).symbols
@@ -0,0 +1,40 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import {default as _fs} from "fs";
+>default : Symbol(_fs, Decl(types.d.ts, 0, 0))
+>_fs : Symbol(_fs, Decl(index.js, 1, 8))
+
+_fs.readFile;
+>_fs : Symbol(_fs, Decl(index.js, 1, 8))
+
+import * as fs from "fs";
+>fs : Symbol(fs, Decl(index.js, 3, 6))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.js, 3, 6))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import {default as _fs} from "fs";
+>default : Symbol(_fs, Decl(types.d.ts, 0, 0))
+>_fs : Symbol(_fs, Decl(index.js, 1, 8))
+
+_fs.readFile;
+>_fs : Symbol(_fs, Decl(index.js, 1, 8))
+
+import * as fs from "fs";
+>fs : Symbol(fs, Decl(index.js, 3, 6))
+
+fs.readFile;
+>fs : Symbol(fs, Decl(index.js, 3, 6))
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).types
new file mode 100644
index 0000000000000..0b27106eae059
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions1(module=nodenext).types
@@ -0,0 +1,48 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import {default as _fs} from "fs";
+>default : any
+>_fs : any
+
+_fs.readFile;
+>_fs.readFile : any
+>_fs : any
+>readFile : any
+
+import * as fs from "fs";
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import {default as _fs} from "fs";
+>default : any
+>_fs : any
+
+_fs.readFile;
+>_fs.readFile : any
+>_fs : any
+>readFile : any
+
+import * as fs from "fs";
+>fs : any
+
+fs.readFile;
+>fs.readFile : any
+>fs : any
+>readFile : any
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).errors.txt
new file mode 100644
index 0000000000000..e07871859dbc2
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).errors.txt
@@ -0,0 +1,32 @@
+tests/cases/conformance/node/allowJs/subfolder/index.ts(2,1): error TS2343: This syntax requires an imported helper named '__exportStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+tests/cases/conformance/node/allowJs/subfolder/index.ts(3,1): error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    export * from "fs";
+    ~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__exportStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    export * as fs from "fs";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    export * from "fs";
+    export * as fs from "fs";
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).js
new file mode 100644
index 0000000000000..e23bc86265999
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).js
@@ -0,0 +1,48 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions2.ts] ////
+
+//// [index.ts]
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+//// [index.js]
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.fs = void 0;
+const tslib_1 = require("tslib");
+// cjs format file
+(0, tslib_1.__exportStar)(require("fs"), exports);
+exports.fs = (0, tslib_1.__importStar)(require("fs"));
+//// [index.js]
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+
+
+//// [index.d.ts]
+export * from "fs";
+export * as fs from "fs";
+//// [index.d.ts]
+/// <reference path="../tests/cases/conformance/node/allowJs/types.d.ts" />
+export * from "fs";
+export * as fs from "fs";
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).symbols
new file mode 100644
index 0000000000000..46c533db2dc75
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.ts ===
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 2, 6))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+>fs : Symbol(fs, Decl(index.js, 2, 6))
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).types
new file mode 100644
index 0000000000000..bbcb3d2993101
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=node12).types
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.ts ===
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+>fs : any
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+>fs : any
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..e07871859dbc2
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).errors.txt
@@ -0,0 +1,32 @@
+tests/cases/conformance/node/allowJs/subfolder/index.ts(2,1): error TS2343: This syntax requires an imported helper named '__exportStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+tests/cases/conformance/node/allowJs/subfolder/index.ts(3,1): error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.ts (2 errors) ====
+    // cjs format file
+    export * from "fs";
+    ~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__exportStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    export * as fs from "fs";
+    ~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importStar' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    export * from "fs";
+    export * as fs from "fs";
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).js
new file mode 100644
index 0000000000000..e23bc86265999
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).js
@@ -0,0 +1,48 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions2.ts] ////
+
+//// [index.ts]
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+//// [index.js]
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.fs = void 0;
+const tslib_1 = require("tslib");
+// cjs format file
+(0, tslib_1.__exportStar)(require("fs"), exports);
+exports.fs = (0, tslib_1.__importStar)(require("fs"));
+//// [index.js]
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+
+
+//// [index.d.ts]
+export * from "fs";
+export * as fs from "fs";
+//// [index.d.ts]
+/// <reference path="../tests/cases/conformance/node/allowJs/types.d.ts" />
+export * from "fs";
+export * as fs from "fs";
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).symbols
new file mode 100644
index 0000000000000..46c533db2dc75
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.ts ===
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+>fs : Symbol(fs, Decl(index.ts, 2, 6))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+>fs : Symbol(fs, Decl(index.js, 2, 6))
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).types
new file mode 100644
index 0000000000000..bbcb3d2993101
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions2(module=nodenext).types
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.ts ===
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+>fs : any
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+>fs : any
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).errors.txt
new file mode 100644
index 0000000000000..cd8457101bb44
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).errors.txt
@@ -0,0 +1,31 @@
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,9): error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (1 errors) ====
+    // cjs format file
+    export {default} from "fs";
+            ~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    export {default as foo} from "fs";
+    export {bar as baz} from "fs";
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    export {default} from "fs";
+    export {default as foo} from "fs";
+    export {bar as baz} from "fs";
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).js
new file mode 100644
index 0000000000000..8e07883b7276b
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).js
@@ -0,0 +1,54 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions3.ts] ////
+
+//// [index.js]
+// cjs format file
+export {default} from "fs";
+export {default as foo} from "fs";
+export {bar as baz} from "fs";
+//// [index.js]
+// esm format file
+export {default} from "fs";
+export {default as foo} from "fs";
+export {bar as baz} from "fs";
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.baz = exports.foo = exports.default = void 0;
+// cjs format file
+var fs_1 = require("fs");
+Object.defineProperty(exports, "default", { enumerable: true, get: function () { return __importDefault(fs_1).default; } });
+var fs_2 = require("fs");
+Object.defineProperty(exports, "foo", { enumerable: true, get: function () { return __importDefault(fs_2).default; } });
+var fs_3 = require("fs");
+Object.defineProperty(exports, "baz", { enumerable: true, get: function () { return fs_3.bar; } });
+//// [index.js]
+// esm format file
+export { default } from "fs";
+export { default as foo } from "fs";
+export { bar as baz } from "fs";
+
+
+//// [index.d.ts]
+export { default, default as foo, bar as baz } from "fs";
+//// [index.d.ts]
+export { default, default as foo, bar as baz } from "fs";
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).symbols
new file mode 100644
index 0000000000000..767be993d649b
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).symbols
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+export {default} from "fs";
+>default : Symbol(default, Decl(index.js, 1, 8))
+
+export {default as foo} from "fs";
+>default : Symbol("fs", Decl(types.d.ts, 0, 0))
+>foo : Symbol(foo, Decl(index.js, 2, 8))
+
+export {bar as baz} from "fs";
+>bar : Symbol("fs", Decl(types.d.ts, 0, 0))
+>baz : Symbol(baz, Decl(index.js, 3, 8))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export {default} from "fs";
+>default : Symbol(default, Decl(index.js, 1, 8))
+
+export {default as foo} from "fs";
+>default : Symbol("fs", Decl(types.d.ts, 0, 0))
+>foo : Symbol(foo, Decl(index.js, 2, 8))
+
+export {bar as baz} from "fs";
+>bar : Symbol("fs", Decl(types.d.ts, 0, 0))
+>baz : Symbol(baz, Decl(index.js, 3, 8))
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).types
new file mode 100644
index 0000000000000..b07207ec08de4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=node12).types
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+export {default} from "fs";
+>default : any
+
+export {default as foo} from "fs";
+>default : any
+>foo : any
+
+export {bar as baz} from "fs";
+>bar : any
+>baz : any
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export {default} from "fs";
+>default : any
+
+export {default as foo} from "fs";
+>default : any
+>foo : any
+
+export {bar as baz} from "fs";
+>bar : any
+>baz : any
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..cd8457101bb44
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).errors.txt
@@ -0,0 +1,31 @@
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,9): error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (1 errors) ====
+    // cjs format file
+    export {default} from "fs";
+            ~~~~~~~
+!!! error TS2343: This syntax requires an imported helper named '__importDefault' which does not exist in 'tslib'. Consider upgrading your version of 'tslib'.
+    export {default as foo} from "fs";
+    export {bar as baz} from "fs";
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    export {default} from "fs";
+    export {default as foo} from "fs";
+    export {bar as baz} from "fs";
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/types.d.ts (0 errors) ====
+    declare module "fs";
+    declare module "tslib" {
+        export {};
+        // intentionally missing all helpers
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).js
new file mode 100644
index 0000000000000..8e07883b7276b
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).js
@@ -0,0 +1,54 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions3.ts] ////
+
+//// [index.js]
+// cjs format file
+export {default} from "fs";
+export {default as foo} from "fs";
+export {bar as baz} from "fs";
+//// [index.js]
+// esm format file
+export {default} from "fs";
+export {default as foo} from "fs";
+export {bar as baz} from "fs";
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [types.d.ts]
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
+
+//// [index.js]
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.baz = exports.foo = exports.default = void 0;
+// cjs format file
+var fs_1 = require("fs");
+Object.defineProperty(exports, "default", { enumerable: true, get: function () { return __importDefault(fs_1).default; } });
+var fs_2 = require("fs");
+Object.defineProperty(exports, "foo", { enumerable: true, get: function () { return __importDefault(fs_2).default; } });
+var fs_3 = require("fs");
+Object.defineProperty(exports, "baz", { enumerable: true, get: function () { return fs_3.bar; } });
+//// [index.js]
+// esm format file
+export { default } from "fs";
+export { default as foo } from "fs";
+export { bar as baz } from "fs";
+
+
+//// [index.d.ts]
+export { default, default as foo, bar as baz } from "fs";
+//// [index.d.ts]
+export { default, default as foo, bar as baz } from "fs";
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).symbols
new file mode 100644
index 0000000000000..767be993d649b
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).symbols
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+export {default} from "fs";
+>default : Symbol(default, Decl(index.js, 1, 8))
+
+export {default as foo} from "fs";
+>default : Symbol("fs", Decl(types.d.ts, 0, 0))
+>foo : Symbol(foo, Decl(index.js, 2, 8))
+
+export {bar as baz} from "fs";
+>bar : Symbol("fs", Decl(types.d.ts, 0, 0))
+>baz : Symbol(baz, Decl(index.js, 3, 8))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export {default} from "fs";
+>default : Symbol(default, Decl(index.js, 1, 8))
+
+export {default as foo} from "fs";
+>default : Symbol("fs", Decl(types.d.ts, 0, 0))
+>foo : Symbol(foo, Decl(index.js, 2, 8))
+
+export {bar as baz} from "fs";
+>bar : Symbol("fs", Decl(types.d.ts, 0, 0))
+>baz : Symbol(baz, Decl(index.js, 3, 8))
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : Symbol("fs", Decl(types.d.ts, 0, 0))
+
+declare module "tslib" {
+>"tslib" : Symbol("tslib", Decl(types.d.ts, 0, 20))
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).types
new file mode 100644
index 0000000000000..b07207ec08de4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportHelpersCollisions3(module=nodenext).types
@@ -0,0 +1,36 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+export {default} from "fs";
+>default : any
+
+export {default as foo} from "fs";
+>default : any
+>foo : any
+
+export {bar as baz} from "fs";
+>bar : any
+>baz : any
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+export {default} from "fs";
+>default : any
+
+export {default as foo} from "fs";
+>default : any
+>foo : any
+
+export {bar as baz} from "fs";
+>bar : any
+>baz : any
+
+=== tests/cases/conformance/node/allowJs/types.d.ts ===
+declare module "fs";
+>"fs" : any
+
+declare module "tslib" {
+>"tslib" : typeof import("tslib")
+
+    export {};
+    // intentionally missing all helpers
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).errors.txt
new file mode 100644
index 0000000000000..1c029f89a5e71
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).errors.txt
@@ -0,0 +1,23 @@
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,11): error TS1434: The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (1 errors) ====
+    // cjs format file
+    const x = import.meta.url;
+              ~~~~~~~~~~~
+!!! error TS1434: The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.
+    export {x};
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    const x = import.meta.url;
+    export {x};
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).js
new file mode 100644
index 0000000000000..7e6d01b7daf2a
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).js
@@ -0,0 +1,38 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportMeta.ts] ////
+
+//// [index.js]
+// cjs format file
+const x = import.meta.url;
+export {x};
+//// [index.js]
+// esm format file
+const x = import.meta.url;
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = import.meta.url;
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = import.meta.url;
+export { x };
+
+
+//// [index.d.ts]
+export const x: string;
+//// [index.d.ts]
+export const x: string;
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).symbols
new file mode 100644
index 0000000000000..d330e94300513
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).symbols
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = import.meta.url;
+>x : Symbol(x, Decl(index.js, 1, 5))
+>import.meta.url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+>url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = import.meta.url;
+>x : Symbol(x, Decl(index.js, 1, 5))
+>import.meta.url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+>url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).types
new file mode 100644
index 0000000000000..de6d0c96059f4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=node12).types
@@ -0,0 +1,24 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = import.meta.url;
+>x : string
+>import.meta.url : string
+>import.meta : ImportMeta
+>meta : any
+>url : string
+
+export {x};
+>x : string
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = import.meta.url;
+>x : string
+>import.meta.url : string
+>import.meta : ImportMeta
+>meta : any
+>url : string
+
+export {x};
+>x : string
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..1c029f89a5e71
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).errors.txt
@@ -0,0 +1,23 @@
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,11): error TS1434: The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (1 errors) ====
+    // cjs format file
+    const x = import.meta.url;
+              ~~~~~~~~~~~
+!!! error TS1434: The 'import.meta' meta-property is not allowed in files which will build into CommonJS output.
+    export {x};
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    const x = import.meta.url;
+    export {x};
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).js
new file mode 100644
index 0000000000000..7e6d01b7daf2a
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).js
@@ -0,0 +1,38 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportMeta.ts] ////
+
+//// [index.js]
+// cjs format file
+const x = import.meta.url;
+export {x};
+//// [index.js]
+// esm format file
+const x = import.meta.url;
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = import.meta.url;
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = import.meta.url;
+export { x };
+
+
+//// [index.d.ts]
+export const x: string;
+//// [index.d.ts]
+export const x: string;
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).symbols
new file mode 100644
index 0000000000000..d330e94300513
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).symbols
@@ -0,0 +1,20 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = import.meta.url;
+>x : Symbol(x, Decl(index.js, 1, 5))
+>import.meta.url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+>url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = import.meta.url;
+>x : Symbol(x, Decl(index.js, 1, 5))
+>import.meta.url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+>url : Symbol(ImportMeta.url, Decl(lib.dom.d.ts, --, --))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).types
new file mode 100644
index 0000000000000..de6d0c96059f4
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsImportMeta(module=nodenext).types
@@ -0,0 +1,24 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = import.meta.url;
+>x : string
+>import.meta.url : string
+>import.meta : ImportMeta
+>meta : any
+>url : string
+
+export {x};
+>x : string
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = import.meta.url;
+>x : string
+>import.meta.url : string
+>import.meta : ImportMeta
+>meta : any
+>url : string
+
+export {x};
+>x : string
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).errors.txt
new file mode 100644
index 0000000000000..da424074020aa
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).errors.txt
@@ -0,0 +1,55 @@
+tests/cases/conformance/node/allowJs/index.js(3,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/index.js(3,22): error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.js(5,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,17): error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/subfolder/index.js(3,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(3,22): error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/subfolder/index.js(5,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (4 errors) ====
+    // cjs format file
+    import {h} from "../index.js";
+                    ~~~~~~~~~~~~~
+!!! error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import mod = require("../index.js");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+                         ~~~~~~~~~~~~~
+!!! error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import {f as _f} from "./index.js";
+    import mod2 = require("./index.js");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    export async function f() {
+        const mod3 = await import ("../index.js");
+        const mod4 = await import ("./index.js");
+        h();
+    }
+==== tests/cases/conformance/node/allowJs/index.js (3 errors) ====
+    // esm format file
+    import {h as _h} from "./index.js";
+    import mod = require("./index.js");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+                         ~~~~~~~~~~~~
+!!! error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import {f} from "./subfolder/index.js";
+    import mod2 = require("./subfolder/index.js");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    export async function h() {
+        const mod3 = await import ("./index.js");
+        const mod4 = await import ("./subfolder/index.js");
+        f();
+    }
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).js
new file mode 100644
index 0000000000000..a02ef88f1e524
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).js
@@ -0,0 +1,60 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsSynchronousCallErrors.ts] ////
+
+//// [index.js]
+// cjs format file
+import {h} from "../index.js";
+import mod = require("../index.js");
+import {f as _f} from "./index.js";
+import mod2 = require("./index.js");
+export async function f() {
+    const mod3 = await import ("../index.js");
+    const mod4 = await import ("./index.js");
+    h();
+}
+//// [index.js]
+// esm format file
+import {h as _h} from "./index.js";
+import mod = require("./index.js");
+import {f} from "./subfolder/index.js";
+import mod2 = require("./subfolder/index.js");
+export async function h() {
+    const mod3 = await import ("./index.js");
+    const mod4 = await import ("./subfolder/index.js");
+    f();
+}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+import { f } from "./subfolder/index.js";
+export async function h() {
+    const mod3 = await import("./index.js");
+    const mod4 = await import("./subfolder/index.js");
+    f();
+}
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.f = void 0;
+// cjs format file
+const index_js_1 = require("../index.js");
+async function f() {
+    const mod3 = await import("../index.js");
+    const mod4 = await import("./index.js");
+    (0, index_js_1.h)();
+}
+exports.f = f;
+
+
+//// [index.d.ts]
+export function h(): Promise<void>;
+//// [index.d.ts]
+export function f(): Promise<void>;
diff --git a/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).symbols
new file mode 100644
index 0000000000000..8cbba01b82f62
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).symbols
@@ -0,0 +1,58 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import {h} from "../index.js";
+>h : Symbol(h, Decl(index.js, 1, 8))
+
+import mod = require("../index.js");
+>mod : Symbol(mod, Decl(index.js, 1, 30))
+
+import {f as _f} from "./index.js";
+>f : Symbol(f, Decl(index.js, 4, 36))
+>_f : Symbol(_f, Decl(index.js, 3, 8))
+
+import mod2 = require("./index.js");
+>mod2 : Symbol(mod2, Decl(index.js, 3, 35))
+
+export async function f() {
+>f : Symbol(f, Decl(index.js, 4, 36))
+
+    const mod3 = await import ("../index.js");
+>mod3 : Symbol(mod3, Decl(index.js, 6, 9))
+>"../index.js" : Symbol(mod, Decl(index.js, 0, 0))
+
+    const mod4 = await import ("./index.js");
+>mod4 : Symbol(mod4, Decl(index.js, 7, 9))
+>"./index.js" : Symbol(mod2, Decl(index.js, 0, 0))
+
+    h();
+>h : Symbol(h, Decl(index.js, 1, 8))
+}
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import {h as _h} from "./index.js";
+>h : Symbol(h, Decl(index.js, 4, 46))
+>_h : Symbol(_h, Decl(index.js, 1, 8))
+
+import mod = require("./index.js");
+>mod : Symbol(mod, Decl(index.js, 1, 35))
+
+import {f} from "./subfolder/index.js";
+>f : Symbol(f, Decl(index.js, 3, 8))
+
+import mod2 = require("./subfolder/index.js");
+>mod2 : Symbol(mod2, Decl(index.js, 3, 39))
+
+export async function h() {
+>h : Symbol(h, Decl(index.js, 4, 46))
+
+    const mod3 = await import ("./index.js");
+>mod3 : Symbol(mod3, Decl(index.js, 6, 9))
+>"./index.js" : Symbol(mod, Decl(index.js, 0, 0))
+
+    const mod4 = await import ("./subfolder/index.js");
+>mod4 : Symbol(mod4, Decl(index.js, 7, 9))
+>"./subfolder/index.js" : Symbol(mod2, Decl(index.js, 0, 0))
+
+    f();
+>f : Symbol(f, Decl(index.js, 3, 8))
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).types
new file mode 100644
index 0000000000000..77061e385af3a
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=node12).types
@@ -0,0 +1,68 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import {h} from "../index.js";
+>h : () => Promise<void>
+
+import mod = require("../index.js");
+>mod : typeof mod
+
+import {f as _f} from "./index.js";
+>f : () => Promise<void>
+>_f : () => Promise<void>
+
+import mod2 = require("./index.js");
+>mod2 : typeof mod2
+
+export async function f() {
+>f : () => Promise<void>
+
+    const mod3 = await import ("../index.js");
+>mod3 : typeof mod
+>await import ("../index.js") : typeof mod
+>import ("../index.js") : Promise<typeof mod>
+>"../index.js" : "../index.js"
+
+    const mod4 = await import ("./index.js");
+>mod4 : typeof mod2
+>await import ("./index.js") : typeof mod2
+>import ("./index.js") : Promise<typeof mod2>
+>"./index.js" : "./index.js"
+
+    h();
+>h() : Promise<void>
+>h : () => Promise<void>
+}
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import {h as _h} from "./index.js";
+>h : () => Promise<void>
+>_h : () => Promise<void>
+
+import mod = require("./index.js");
+>mod : typeof mod
+
+import {f} from "./subfolder/index.js";
+>f : () => Promise<void>
+
+import mod2 = require("./subfolder/index.js");
+>mod2 : typeof mod2
+
+export async function h() {
+>h : () => Promise<void>
+
+    const mod3 = await import ("./index.js");
+>mod3 : typeof mod
+>await import ("./index.js") : typeof mod
+>import ("./index.js") : Promise<typeof mod>
+>"./index.js" : "./index.js"
+
+    const mod4 = await import ("./subfolder/index.js");
+>mod4 : typeof mod2
+>await import ("./subfolder/index.js") : typeof mod2
+>import ("./subfolder/index.js") : Promise<typeof mod2>
+>"./subfolder/index.js" : "./subfolder/index.js"
+
+    f();
+>f() : Promise<void>
+>f : () => Promise<void>
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..da424074020aa
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).errors.txt
@@ -0,0 +1,55 @@
+tests/cases/conformance/node/allowJs/index.js(3,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/index.js(3,22): error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.js(5,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,17): error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/subfolder/index.js(3,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+tests/cases/conformance/node/allowJs/subfolder/index.js(3,22): error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/subfolder/index.js(5,1): error TS8002: 'import ... =' can only be used in TypeScript files.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (4 errors) ====
+    // cjs format file
+    import {h} from "../index.js";
+                    ~~~~~~~~~~~~~
+!!! error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import mod = require("../index.js");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+                         ~~~~~~~~~~~~~
+!!! error TS1435: Module '../index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import {f as _f} from "./index.js";
+    import mod2 = require("./index.js");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    export async function f() {
+        const mod3 = await import ("../index.js");
+        const mod4 = await import ("./index.js");
+        h();
+    }
+==== tests/cases/conformance/node/allowJs/index.js (3 errors) ====
+    // esm format file
+    import {h as _h} from "./index.js";
+    import mod = require("./index.js");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+                         ~~~~~~~~~~~~
+!!! error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import {f} from "./subfolder/index.js";
+    import mod2 = require("./subfolder/index.js");
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS8002: 'import ... =' can only be used in TypeScript files.
+    export async function h() {
+        const mod3 = await import ("./index.js");
+        const mod4 = await import ("./subfolder/index.js");
+        f();
+    }
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).js
new file mode 100644
index 0000000000000..a02ef88f1e524
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).js
@@ -0,0 +1,60 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsSynchronousCallErrors.ts] ////
+
+//// [index.js]
+// cjs format file
+import {h} from "../index.js";
+import mod = require("../index.js");
+import {f as _f} from "./index.js";
+import mod2 = require("./index.js");
+export async function f() {
+    const mod3 = await import ("../index.js");
+    const mod4 = await import ("./index.js");
+    h();
+}
+//// [index.js]
+// esm format file
+import {h as _h} from "./index.js";
+import mod = require("./index.js");
+import {f} from "./subfolder/index.js";
+import mod2 = require("./subfolder/index.js");
+export async function h() {
+    const mod3 = await import ("./index.js");
+    const mod4 = await import ("./subfolder/index.js");
+    f();
+}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+import { f } from "./subfolder/index.js";
+export async function h() {
+    const mod3 = await import("./index.js");
+    const mod4 = await import("./subfolder/index.js");
+    f();
+}
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.f = void 0;
+// cjs format file
+const index_js_1 = require("../index.js");
+async function f() {
+    const mod3 = await import("../index.js");
+    const mod4 = await import("./index.js");
+    (0, index_js_1.h)();
+}
+exports.f = f;
+
+
+//// [index.d.ts]
+export function h(): Promise<void>;
+//// [index.d.ts]
+export function f(): Promise<void>;
diff --git a/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).symbols
new file mode 100644
index 0000000000000..8cbba01b82f62
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).symbols
@@ -0,0 +1,58 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import {h} from "../index.js";
+>h : Symbol(h, Decl(index.js, 1, 8))
+
+import mod = require("../index.js");
+>mod : Symbol(mod, Decl(index.js, 1, 30))
+
+import {f as _f} from "./index.js";
+>f : Symbol(f, Decl(index.js, 4, 36))
+>_f : Symbol(_f, Decl(index.js, 3, 8))
+
+import mod2 = require("./index.js");
+>mod2 : Symbol(mod2, Decl(index.js, 3, 35))
+
+export async function f() {
+>f : Symbol(f, Decl(index.js, 4, 36))
+
+    const mod3 = await import ("../index.js");
+>mod3 : Symbol(mod3, Decl(index.js, 6, 9))
+>"../index.js" : Symbol(mod, Decl(index.js, 0, 0))
+
+    const mod4 = await import ("./index.js");
+>mod4 : Symbol(mod4, Decl(index.js, 7, 9))
+>"./index.js" : Symbol(mod2, Decl(index.js, 0, 0))
+
+    h();
+>h : Symbol(h, Decl(index.js, 1, 8))
+}
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import {h as _h} from "./index.js";
+>h : Symbol(h, Decl(index.js, 4, 46))
+>_h : Symbol(_h, Decl(index.js, 1, 8))
+
+import mod = require("./index.js");
+>mod : Symbol(mod, Decl(index.js, 1, 35))
+
+import {f} from "./subfolder/index.js";
+>f : Symbol(f, Decl(index.js, 3, 8))
+
+import mod2 = require("./subfolder/index.js");
+>mod2 : Symbol(mod2, Decl(index.js, 3, 39))
+
+export async function h() {
+>h : Symbol(h, Decl(index.js, 4, 46))
+
+    const mod3 = await import ("./index.js");
+>mod3 : Symbol(mod3, Decl(index.js, 6, 9))
+>"./index.js" : Symbol(mod, Decl(index.js, 0, 0))
+
+    const mod4 = await import ("./subfolder/index.js");
+>mod4 : Symbol(mod4, Decl(index.js, 7, 9))
+>"./subfolder/index.js" : Symbol(mod2, Decl(index.js, 0, 0))
+
+    f();
+>f : Symbol(f, Decl(index.js, 3, 8))
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).types
new file mode 100644
index 0000000000000..77061e385af3a
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsSynchronousCallErrors(module=nodenext).types
@@ -0,0 +1,68 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+import {h} from "../index.js";
+>h : () => Promise<void>
+
+import mod = require("../index.js");
+>mod : typeof mod
+
+import {f as _f} from "./index.js";
+>f : () => Promise<void>
+>_f : () => Promise<void>
+
+import mod2 = require("./index.js");
+>mod2 : typeof mod2
+
+export async function f() {
+>f : () => Promise<void>
+
+    const mod3 = await import ("../index.js");
+>mod3 : typeof mod
+>await import ("../index.js") : typeof mod
+>import ("../index.js") : Promise<typeof mod>
+>"../index.js" : "../index.js"
+
+    const mod4 = await import ("./index.js");
+>mod4 : typeof mod2
+>await import ("./index.js") : typeof mod2
+>import ("./index.js") : Promise<typeof mod2>
+>"./index.js" : "./index.js"
+
+    h();
+>h() : Promise<void>
+>h : () => Promise<void>
+}
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+import {h as _h} from "./index.js";
+>h : () => Promise<void>
+>_h : () => Promise<void>
+
+import mod = require("./index.js");
+>mod : typeof mod
+
+import {f} from "./subfolder/index.js";
+>f : () => Promise<void>
+
+import mod2 = require("./subfolder/index.js");
+>mod2 : typeof mod2
+
+export async function h() {
+>h : () => Promise<void>
+
+    const mod3 = await import ("./index.js");
+>mod3 : typeof mod
+>await import ("./index.js") : typeof mod
+>import ("./index.js") : Promise<typeof mod>
+>"./index.js" : "./index.js"
+
+    const mod4 = await import ("./subfolder/index.js");
+>mod4 : typeof mod2
+>await import ("./subfolder/index.js") : typeof mod2
+>import ("./subfolder/index.js") : Promise<typeof mod2>
+>"./subfolder/index.js" : "./subfolder/index.js"
+
+    f();
+>f() : Promise<void>
+>f : () => Promise<void>
+}
diff --git a/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).errors.txt
new file mode 100644
index 0000000000000..eff86eab7e9d6
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).errors.txt
@@ -0,0 +1,34 @@
+tests/cases/conformance/node/allowJs/index.js(2,11): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/node/allowJs/index.js(4,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,11): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/node/allowJs/subfolder/index.js(4,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (2 errors) ====
+    // cjs format file
+    const x = await 1;
+              ~~~~~
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+    export {x};
+    for await (const y of []) {}
+        ~~~~~
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+==== tests/cases/conformance/node/allowJs/index.js (2 errors) ====
+    // esm format file
+    const x = await 1;
+              ~~~~~
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+    export {x};
+    for await (const y of []) {}
+        ~~~~~
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).js b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).js
new file mode 100644
index 0000000000000..354fe725f0960
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).js
@@ -0,0 +1,42 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsTopLevelAwait.ts] ////
+
+//// [index.js]
+// cjs format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+//// [index.js]
+// esm format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = await 1;
+exports.x = x;
+for await (const y of []) { }
+//// [index.js]
+// esm format file
+const x = await 1;
+export { x };
+for await (const y of []) { }
+
+
+//// [index.d.ts]
+export const x: 1;
+//// [index.d.ts]
+export const x: 1;
diff --git a/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).symbols
new file mode 100644
index 0000000000000..09ad69c019c70
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = await 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+for await (const y of []) {}
+>y : Symbol(y, Decl(index.js, 3, 16))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = await 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+for await (const y of []) {}
+>y : Symbol(y, Decl(index.js, 3, 16))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).types b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).types
new file mode 100644
index 0000000000000..b50bdd2c107e5
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=node12).types
@@ -0,0 +1,28 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = await 1;
+>x : 1
+>await 1 : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+for await (const y of []) {}
+>y : any
+>[] : undefined[]
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = await 1;
+>x : 1
+>await 1 : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+for await (const y of []) {}
+>y : any
+>[] : undefined[]
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..f2b3347f94df8
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).errors.txt
@@ -0,0 +1,28 @@
+tests/cases/conformance/node/allowJs/subfolder/index.js(2,11): error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+tests/cases/conformance/node/allowJs/subfolder/index.js(4,5): error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (2 errors) ====
+    // cjs format file
+    const x = await 1;
+              ~~~~~
+!!! error TS1378: Top-level 'await' expressions are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+    export {x};
+    for await (const y of []) {}
+        ~~~~~
+!!! error TS1432: Top-level 'for await' loops are only allowed when the 'module' option is set to 'esnext', 'system', or 'nodenext', and the 'target' option is set to 'es2017' or higher.
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    // esm format file
+    const x = await 1;
+    export {x};
+    for await (const y of []) {}
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).js
new file mode 100644
index 0000000000000..354fe725f0960
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).js
@@ -0,0 +1,42 @@
+//// [tests/cases/conformance/node/allowJs/nodeModulesAllowJsTopLevelAwait.ts] ////
+
+//// [index.js]
+// cjs format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+//// [index.js]
+// esm format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = await 1;
+exports.x = x;
+for await (const y of []) { }
+//// [index.js]
+// esm format file
+const x = await 1;
+export { x };
+for await (const y of []) { }
+
+
+//// [index.d.ts]
+export const x: 1;
+//// [index.d.ts]
+export const x: 1;
diff --git a/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).symbols
new file mode 100644
index 0000000000000..09ad69c019c70
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).symbols
@@ -0,0 +1,22 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = await 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+for await (const y of []) {}
+>y : Symbol(y, Decl(index.js, 3, 16))
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = await 1;
+>x : Symbol(x, Decl(index.js, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.js, 2, 8))
+
+for await (const y of []) {}
+>y : Symbol(y, Decl(index.js, 3, 16))
+
diff --git a/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).types
new file mode 100644
index 0000000000000..b50bdd2c107e5
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJsTopLevelAwait(module=nodenext).types
@@ -0,0 +1,28 @@
+=== tests/cases/conformance/node/allowJs/subfolder/index.js ===
+// cjs format file
+const x = await 1;
+>x : 1
+>await 1 : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+for await (const y of []) {}
+>y : any
+>[] : undefined[]
+
+=== tests/cases/conformance/node/allowJs/index.js ===
+// esm format file
+const x = await 1;
+>x : 1
+>await 1 : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+for await (const y of []) {}
+>y : any
+>[] : undefined[]
+
diff --git a/tests/baselines/reference/nodeModulesDynamicImport(module=node12).js b/tests/baselines/reference/nodeModulesDynamicImport(module=node12).js
index 71f2979b2146e..aceeafb8c5965 100644
--- a/tests/baselines/reference/nodeModulesDynamicImport(module=node12).js
+++ b/tests/baselines/reference/nodeModulesDynamicImport(module=node12).js
@@ -37,3 +37,9 @@ exports.main = main;
 export async function main() {
     const { readFile } = await import("fs");
 }
+
+
+//// [index.d.ts]
+export declare function main(): Promise<void>;
+//// [index.d.ts]
+export declare function main(): Promise<void>;
diff --git a/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).js b/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).js
index 71f2979b2146e..aceeafb8c5965 100644
--- a/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesDynamicImport(module=nodenext).js
@@ -37,3 +37,9 @@ exports.main = main;
 export async function main() {
     const { readFile } = await import("fs");
 }
+
+
+//// [index.d.ts]
+export declare function main(): Promise<void>;
+//// [index.d.ts]
+export declare function main(): Promise<void>;
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=node12).js b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).js
index 687d129e52e4e..2d09438ae7cd8 100644
--- a/tests/baselines/reference/nodeModulesExportAssignments(module=node12).js
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=node12).js
@@ -28,3 +28,11 @@ module.exports = a;
 // esm format file
 const a = {};
 export {};
+
+
+//// [index.d.ts]
+declare const a: {};
+export = a;
+//// [index.d.ts]
+declare const a: {};
+export = a;
diff --git a/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).js b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).js
index 687d129e52e4e..2d09438ae7cd8 100644
--- a/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesExportAssignments(module=nodenext).js
@@ -28,3 +28,11 @@ module.exports = a;
 // esm format file
 const a = {};
 export {};
+
+
+//// [index.d.ts]
+declare const a: {};
+export = a;
+//// [index.d.ts]
+declare const a: {};
+export = a;
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).js b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).js
index cc5f8296acfc8..064128d216ee8 100644
--- a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).js
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=node12).js
@@ -46,3 +46,19 @@ class Object {
 }
 export const __esModule = false;
 export { require, exports, Object };
+
+
+//// [index.d.ts]
+declare function require(): void;
+declare const exports: {};
+declare class Object {
+}
+export declare const __esModule = false;
+export { require, exports, Object };
+//// [index.d.ts]
+declare function require(): void;
+declare const exports: {};
+declare class Object {
+}
+export declare const __esModule = false;
+export { require, exports, Object };
diff --git a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).js b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).js
index cc5f8296acfc8..064128d216ee8 100644
--- a/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesGeneratedNameCollisions(module=nodenext).js
@@ -46,3 +46,19 @@ class Object {
 }
 export const __esModule = false;
 export { require, exports, Object };
+
+
+//// [index.d.ts]
+declare function require(): void;
+declare const exports: {};
+declare class Object {
+}
+export declare const __esModule = false;
+export { require, exports, Object };
+//// [index.d.ts]
+declare function require(): void;
+declare const exports: {};
+declare class Object {
+}
+export declare const __esModule = false;
+export { require, exports, Object };
diff --git a/tests/baselines/reference/nodeModulesImportAssignments(module=node12).js b/tests/baselines/reference/nodeModulesImportAssignments(module=node12).js
index 509c046355ebe..c73ff1177a58e 100644
--- a/tests/baselines/reference/nodeModulesImportAssignments(module=node12).js
+++ b/tests/baselines/reference/nodeModulesImportAssignments(module=node12).js
@@ -55,3 +55,11 @@ const fs = __require_1("fs");
 fs.readFile;
 const fs2 = __require_1("fs");
 export { fs2 };
+
+
+//// [index.d.ts]
+export import fs2 = require("fs");
+//// [index.d.ts]
+export import fs2 = require("fs");
+//// [file.d.ts]
+export import fs2 = require("fs");
diff --git a/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).js b/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).js
index 509c046355ebe..c73ff1177a58e 100644
--- a/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesImportAssignments(module=nodenext).js
@@ -55,3 +55,11 @@ const fs = __require_1("fs");
 fs.readFile;
 const fs2 = __require_1("fs");
 export { fs2 };
+
+
+//// [index.d.ts]
+export import fs2 = require("fs");
+//// [index.d.ts]
+export import fs2 = require("fs");
+//// [file.d.ts]
+export import fs2 = require("fs");
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).js
index 7e7ddefb4008e..87467d9fd7e6b 100644
--- a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).js
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=node12).js
@@ -44,3 +44,9 @@ import { default as _fs } from "fs";
 _fs.readFile;
 import * as fs from "fs";
 fs.readFile;
+
+
+//// [index.d.ts]
+export {};
+//// [index.d.ts]
+export {};
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).js
index 7e7ddefb4008e..87467d9fd7e6b 100644
--- a/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions(module=nodenext).js
@@ -44,3 +44,9 @@ import { default as _fs } from "fs";
 _fs.readFile;
 import * as fs from "fs";
 fs.readFile;
+
+
+//// [index.d.ts]
+export {};
+//// [index.d.ts]
+export {};
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).js
index 0ba480d137160..1cc268a7fa066 100644
--- a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).js
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=node12).js
@@ -37,3 +37,11 @@ exports.fs = (0, tslib_1.__importStar)(require("fs"));
 // esm format file
 export * from "fs";
 export * as fs from "fs";
+
+
+//// [index.d.ts]
+export * from "fs";
+export * as fs from "fs";
+//// [index.d.ts]
+export * from "fs";
+export * as fs from "fs";
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).js
index 0ba480d137160..1cc268a7fa066 100644
--- a/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions2(module=nodenext).js
@@ -37,3 +37,11 @@ exports.fs = (0, tslib_1.__importStar)(require("fs"));
 // esm format file
 export * from "fs";
 export * as fs from "fs";
+
+
+//// [index.d.ts]
+export * from "fs";
+export * as fs from "fs";
+//// [index.d.ts]
+export * from "fs";
+export * as fs from "fs";
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).js
index b541d7253fb3d..8abf8ba9adac3 100644
--- a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).js
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=node12).js
@@ -36,3 +36,9 @@ Object.defineProperty(exports, "default", { enumerable: true, get: function () {
 //// [index.js]
 // esm format file
 export { default } from "fs";
+
+
+//// [index.d.ts]
+export { default } from "fs";
+//// [index.d.ts]
+export { default } from "fs";
diff --git a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).js b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).js
index b541d7253fb3d..8abf8ba9adac3 100644
--- a/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesImportHelpersCollisions3(module=nodenext).js
@@ -36,3 +36,9 @@ Object.defineProperty(exports, "default", { enumerable: true, get: function () {
 //// [index.js]
 // esm format file
 export { default } from "fs";
+
+
+//// [index.d.ts]
+export { default } from "fs";
+//// [index.d.ts]
+export { default } from "fs";
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=node12).js b/tests/baselines/reference/nodeModulesImportMeta(module=node12).js
index a236853057399..aa962a90bd346 100644
--- a/tests/baselines/reference/nodeModulesImportMeta(module=node12).js
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=node12).js
@@ -30,3 +30,11 @@ exports.x = x;
 // esm format file
 const x = import.meta.url;
 export { x };
+
+
+//// [index.d.ts]
+declare const x: string;
+export { x };
+//// [index.d.ts]
+declare const x: string;
+export { x };
diff --git a/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).js b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).js
index a236853057399..aa962a90bd346 100644
--- a/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesImportMeta(module=nodenext).js
@@ -30,3 +30,11 @@ exports.x = x;
 // esm format file
 const x = import.meta.url;
 export { x };
+
+
+//// [index.d.ts]
+declare const x: string;
+export { x };
+//// [index.d.ts]
+declare const x: string;
+export { x };
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).js b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).js
index c37ce0438cba1..7ac63da59146b 100644
--- a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).js
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=node12).js
@@ -52,3 +52,9 @@ async function f() {
     (0, index_js_1.h)();
 }
 exports.f = f;
+
+
+//// [index.d.ts]
+export declare function h(): Promise<void>;
+//// [index.d.ts]
+export declare function f(): Promise<void>;
diff --git a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).js b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).js
index c37ce0438cba1..7ac63da59146b 100644
--- a/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesSynchronousCallErrors(module=nodenext).js
@@ -52,3 +52,9 @@ async function f() {
     (0, index_js_1.h)();
 }
 exports.f = f;
+
+
+//// [index.d.ts]
+export declare function h(): Promise<void>;
+//// [index.d.ts]
+export declare function f(): Promise<void>;
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).js b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).js
index ee36688fe4cf3..8d33777f0c4e7 100644
--- a/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).js
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=node12).js
@@ -34,3 +34,11 @@ for await (const y of []) { }
 const x = await 1;
 export { x };
 for await (const y of []) { }
+
+
+//// [index.d.ts]
+declare const x = 1;
+export { x };
+//// [index.d.ts]
+declare const x = 1;
+export { x };
diff --git a/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).js b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).js
index ee36688fe4cf3..8d33777f0c4e7 100644
--- a/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesTopLevelAwait(module=nodenext).js
@@ -34,3 +34,11 @@ for await (const y of []) { }
 const x = await 1;
 export { x };
 for await (const y of []) { }
+
+
+//// [index.d.ts]
+declare const x = 1;
+export { x };
+//// [index.d.ts]
+declare const x = 1;
+export { x };
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts
new file mode 100644
index 0000000000000..9b27ee95c1789
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts
@@ -0,0 +1,38 @@
+// @module: node12,nodenext
+// @declaration: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+const x = 1;
+export {x};
+// @filename: subfolder2/index.js
+// cjs format file
+const x = 1;
+export {x};
+// @filename: subfolder2/another/index.js
+// esm format file
+const x = 1;
+export {x};
+// @filename: index.js
+// esm format file
+const x = 1;
+export {x};
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: subfolder2/package.json
+{
+}
+// @filename: subfolder2/another/package.json
+{
+    "type": "module"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsDynamicImport.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsDynamicImport.ts
new file mode 100644
index 0000000000000..d7032c648b46c
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsDynamicImport.ts
@@ -0,0 +1,27 @@
+// @module: node12,nodenext
+// @declaration: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+// @filename: index.js
+// esm format file
+export async function main() {
+    const { readFile } = await import("fs");
+}
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsExportAssignment.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsExportAssignment.ts
new file mode 100644
index 0000000000000..f7d5aaf822a30
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsExportAssignment.ts
@@ -0,0 +1,32 @@
+// @module: node12,nodenext
+// @declaration: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+const a = {};
+export = a;
+// @filename: subfolder/file.js
+// cjs format file
+const a = {};
+module.exports = a;
+// @filename: index.js
+// esm format file
+const a = {};
+export = a;
+// @filename: file.js
+// esm format file
+import "fs";
+const a = {};
+module.exports = a;
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsGeneratedNameCollisions.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsGeneratedNameCollisions.ts
new file mode 100644
index 0000000000000..14783731bf9a2
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsGeneratedNameCollisions.ts
@@ -0,0 +1,29 @@
+// @module: node12,nodenext
+// @declaration: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+// @filename: index.js
+// esm format file
+function require() {}
+const exports = {};
+class Object {}
+export const __esModule = false;
+export {require, exports, Object};
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportAssignment.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportAssignment.ts
new file mode 100644
index 0000000000000..53e6b9445002b
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportAssignment.ts
@@ -0,0 +1,34 @@
+// @module: node12,nodenext
+// @declaration: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+// @filename: index.js
+// esm format file
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+// @filename: file.js
+// esm format file
+const __require = null;
+const _createRequire = null;
+import fs = require("fs");
+fs.readFile;
+export import fs2 = require("fs");
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions1.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions1.ts
new file mode 100644
index 0000000000000..d5727a3dc787e
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions1.ts
@@ -0,0 +1,34 @@
+// @module: node12,nodenext
+// @declaration: true
+// @importHelpers: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+// @filename: index.js
+// esm format file
+import {default as _fs} from "fs";
+_fs.readFile;
+import * as fs from "fs";
+fs.readFile;
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions2.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions2.ts
new file mode 100644
index 0000000000000..032290f78bafd
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions2.ts
@@ -0,0 +1,30 @@
+// @module: node12,nodenext
+// @declaration: true
+// @importHelpers: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.ts
+// cjs format file
+export * from "fs";
+export * as fs from "fs";
+// @filename: index.js
+// esm format file
+export * from "fs";
+export * as fs from "fs";
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions3.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions3.ts
new file mode 100644
index 0000000000000..9452e2003a66c
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportHelpersCollisions3.ts
@@ -0,0 +1,32 @@
+// @module: node12,nodenext
+// @declaration: true
+// @importHelpers: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+export {default} from "fs";
+export {default as foo} from "fs";
+export {bar as baz} from "fs";
+// @filename: index.js
+// esm format file
+export {default} from "fs";
+export {default as foo} from "fs";
+export {bar as baz} from "fs";
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: types.d.ts
+declare module "fs";
+declare module "tslib" {
+    export {};
+    // intentionally missing all helpers
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportMeta.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportMeta.ts
new file mode 100644
index 0000000000000..a8708434b93ae
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsImportMeta.ts
@@ -0,0 +1,23 @@
+// @module: node12,nodenext
+// @declaration: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+const x = import.meta.url;
+export {x};
+// @filename: index.js
+// esm format file
+const x = import.meta.url;
+export {x};
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsSynchronousCallErrors.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsSynchronousCallErrors.ts
new file mode 100644
index 0000000000000..15892edbe32c5
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsSynchronousCallErrors.ts
@@ -0,0 +1,37 @@
+// @module: node12,nodenext
+// @declaration: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+import {h} from "../index.js";
+import mod = require("../index.js");
+import {f as _f} from "./index.js";
+import mod2 = require("./index.js");
+export async function f() {
+    const mod3 = await import ("../index.js");
+    const mod4 = await import ("./index.js");
+    h();
+}
+// @filename: index.js
+// esm format file
+import {h as _h} from "./index.js";
+import mod = require("./index.js");
+import {f} from "./subfolder/index.js";
+import mod2 = require("./subfolder/index.js");
+export async function h() {
+    const mod3 = await import ("./index.js");
+    const mod4 = await import ("./subfolder/index.js");
+    f();
+}
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJsTopLevelAwait.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsTopLevelAwait.ts
new file mode 100644
index 0000000000000..872cad71c91d5
--- /dev/null
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJsTopLevelAwait.ts
@@ -0,0 +1,25 @@
+// @module: node12,nodenext
+// @declaration: true
+// @allowJs: true
+// @checkJs: true
+// @outDir: out
+// @filename: subfolder/index.js
+// cjs format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+// @filename: index.js
+// esm format file
+const x = await 1;
+export {x};
+for await (const y of []) {}
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
\ No newline at end of file
diff --git a/tests/cases/conformance/node/nodeModules1.ts b/tests/cases/conformance/node/nodeModules1.ts
index 9d81258595ae8..349d103b0efcf 100644
--- a/tests/cases/conformance/node/nodeModules1.ts
+++ b/tests/cases/conformance/node/nodeModules1.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @filename: subfolder/index.ts
 // cjs format file
 const x = 1;
diff --git a/tests/cases/conformance/node/nodeModulesDynamicImport.ts b/tests/cases/conformance/node/nodeModulesDynamicImport.ts
index 75a5dcfc88cfb..46b317ca52da7 100644
--- a/tests/cases/conformance/node/nodeModulesDynamicImport.ts
+++ b/tests/cases/conformance/node/nodeModulesDynamicImport.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @filename: subfolder/index.ts
 // cjs format file
 export async function main() {
diff --git a/tests/cases/conformance/node/nodeModulesExportAssignments.ts b/tests/cases/conformance/node/nodeModulesExportAssignments.ts
index ba604d85090ac..7cbcd200d9699 100644
--- a/tests/cases/conformance/node/nodeModulesExportAssignments.ts
+++ b/tests/cases/conformance/node/nodeModulesExportAssignments.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @filename: subfolder/index.ts
 // cjs format file
 const a = {};
diff --git a/tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts b/tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts
index 5f708e1454c7b..e9a9b9d9eddc3 100644
--- a/tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts
+++ b/tests/cases/conformance/node/nodeModulesGeneratedNameCollisions.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @filename: subfolder/index.ts
 // cjs format file
 function require() {}
diff --git a/tests/cases/conformance/node/nodeModulesImportAssignments.ts b/tests/cases/conformance/node/nodeModulesImportAssignments.ts
index d89c23438256a..6c22fe83e000d 100644
--- a/tests/cases/conformance/node/nodeModulesImportAssignments.ts
+++ b/tests/cases/conformance/node/nodeModulesImportAssignments.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @filename: subfolder/index.ts
 // cjs format file
 import fs = require("fs");
diff --git a/tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts
index 95f3830e818fa..103b58371243f 100644
--- a/tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts
+++ b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @importHelpers: true
 // @filename: subfolder/index.ts
 // cjs format file
diff --git a/tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts
index f018d86e63848..7f90947a5fbcf 100644
--- a/tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts
+++ b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions2.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @importHelpers: true
 // @filename: subfolder/index.ts
 // cjs format file
diff --git a/tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts
index b661affe17a2c..5f6984ad1fb8b 100644
--- a/tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts
+++ b/tests/cases/conformance/node/nodeModulesImportHelpersCollisions3.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @importHelpers: true
 // @filename: subfolder/index.ts
 // cjs format file
diff --git a/tests/cases/conformance/node/nodeModulesImportMeta.ts b/tests/cases/conformance/node/nodeModulesImportMeta.ts
index ea83d1b33b3b3..d684c7b5cb26b 100644
--- a/tests/cases/conformance/node/nodeModulesImportMeta.ts
+++ b/tests/cases/conformance/node/nodeModulesImportMeta.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @filename: subfolder/index.ts
 // cjs format file
 const x = import.meta.url;
diff --git a/tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts b/tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts
index 8505ee4775096..78aa93ee17c0c 100644
--- a/tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts
+++ b/tests/cases/conformance/node/nodeModulesSynchronousCallErrors.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @filename: subfolder/index.ts
 // cjs format file
 import {h} from "../index.js";
diff --git a/tests/cases/conformance/node/nodeModulesTopLevelAwait.ts b/tests/cases/conformance/node/nodeModulesTopLevelAwait.ts
index 4c950c0072f1d..2fbd5d3b0cd28 100644
--- a/tests/cases/conformance/node/nodeModulesTopLevelAwait.ts
+++ b/tests/cases/conformance/node/nodeModulesTopLevelAwait.ts
@@ -1,4 +1,5 @@
 // @module: node12,nodenext
+// @declaration: true
 // @filename: subfolder/index.ts
 // cjs format file
 const x = await 1;

From b447ed7707ee780517da4c7d0168e55f88625e90 Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Mon, 12 Jul 2021 15:34:43 -0700
Subject: [PATCH 3/9] Fix typos

---
 src/compiler/program.ts                            | 2 +-
 src/compiler/transformers/module/esnextAnd2015.ts  | 2 +-
 src/compiler/types.ts                              | 4 ++--
 tests/baselines/reference/api/tsserverlibrary.d.ts | 4 ++--
 tests/baselines/reference/api/typescript.d.ts      | 4 ++--
 5 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index d52b9bec5da7a..d529b73ffacb5 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -743,7 +743,7 @@ namespace ts {
      * `options` parameter.
      *
      * @param fileName The normalized absolute path to check the format of (it need not exist on disk)
-     * @param packageJsonInfoCache (Optional) A cache for package file lookups - it's best to have a cache when this function is called often
+     * @param [packageJsonInfoCache] A cache for package file lookups - it's best to have a cache when this function is called often
      * @param host The ModuleResolutionHost which can perform the filesystem lookups for package json data
      * @param options The compiler options to perform the analysis under - relevant options are `moduleResolution` and `traceResolution`
      * @returns `undefined` if the path has no relevant implied format, `ModuleKind.ESNext` for esm format, and `ModuleKind.CommonJS` for cjs format
diff --git a/src/compiler/transformers/module/esnextAnd2015.ts b/src/compiler/transformers/module/esnextAnd2015.ts
index a4e75b84c8b7f..fa4532d143255 100644
--- a/src/compiler/transformers/module/esnextAnd2015.ts
+++ b/src/compiler/transformers/module/esnextAnd2015.ts
@@ -86,7 +86,7 @@ namespace ts {
         /**
          * Creates a `require()` call to import an external module.
          *
-         * @param importNode The declararation to import.
+         * @param importNode The declaration to import.
          */
          function createRequireCall(importNode: ImportDeclaration | ImportEqualsDeclaration | ExportDeclaration) {
             const moduleName = getExternalModuleNameLiteral(factory, importNode, Debug.checkDefined(currentSourceFile), host, resolver, compilerOptions);
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index e101c6614e183..e3a10b9766ff6 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -3549,7 +3549,7 @@ namespace ts {
         languageVersion: ScriptTarget;
 
         /**
-         * When `module` is `Node12` or `NodeNext`, this field controls weather the
+         * When `module` is `Node12` or `NodeNext`, this field controls whether the
          * source file in question is an ESNext-output-format file, or a CommonJS-output-format
          * module. This is derived by the module resolver as it looks up the file, since
          * it is derived from either the file extension of the module, or the containing
@@ -5931,7 +5931,7 @@ namespace ts {
         NodeJs   = 2,
         // Starting with node12, node's module resolver has significant departures from tranditional cjs resolution
         // to better support ecmascript modules and their use within node - more features are still being added, so
-        // we can expect it co change over time, and as such, offer both a `NodeNext` moving resolution target, and a `Node12`
+        // we can expect it to change over time, and as such, offer both a `NodeNext` moving resolution target, and a `Node12`
         // version-anchored resolution target
         Node12   = 3,
         NodeNext = 99, // Not simply `Node12` so that compiled code linked against TS can use the `Next` value reliably (same as with `ModuleKind`)
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 51398e9b34d45..60094a7eda360 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -1990,7 +1990,7 @@ declare namespace ts {
         hasNoDefaultLib: boolean;
         languageVersion: ScriptTarget;
         /**
-         * When `module` is `Node12` or `NodeNext`, this field controls weather the
+         * When `module` is `Node12` or `NodeNext`, this field controls whether the
          * source file in question is an ESNext-output-format file, or a CommonJS-output-format
          * module. This is derived by the module resolver as it looks up the file, since
          * it is derived from either the file extension of the module, or the containing
@@ -4953,7 +4953,7 @@ declare namespace ts {
      * `options` parameter.
      *
      * @param fileName The normalized absolute path to check the format of (it need not exist on disk)
-     * @param packageJsonInfoCache (Optional) A cache for package file lookups - it's best to have a cache when this function is called often
+     * @param [packageJsonInfoCache] A cache for package file lookups - it's best to have a cache when this function is called often
      * @param host The ModuleResolutionHost which can perform the filesystem lookups for package json data
      * @param options The compiler options to perform the analysis under - relevant options are `moduleResolution` and `traceResolution`
      * @returns `undefined` if the path has no relevant implied format, `ModuleKind.ESNext` for esm format, and `ModuleKind.CommonJS` for cjs format
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 017e6f61628db..20a47d5baefd0 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -1990,7 +1990,7 @@ declare namespace ts {
         hasNoDefaultLib: boolean;
         languageVersion: ScriptTarget;
         /**
-         * When `module` is `Node12` or `NodeNext`, this field controls weather the
+         * When `module` is `Node12` or `NodeNext`, this field controls whether the
          * source file in question is an ESNext-output-format file, or a CommonJS-output-format
          * module. This is derived by the module resolver as it looks up the file, since
          * it is derived from either the file extension of the module, or the containing
@@ -4953,7 +4953,7 @@ declare namespace ts {
      * `options` parameter.
      *
      * @param fileName The normalized absolute path to check the format of (it need not exist on disk)
-     * @param packageJsonInfoCache (Optional) A cache for package file lookups - it's best to have a cache when this function is called often
+     * @param [packageJsonInfoCache] A cache for package file lookups - it's best to have a cache when this function is called often
      * @param host The ModuleResolutionHost which can perform the filesystem lookups for package json data
      * @param options The compiler options to perform the analysis under - relevant options are `moduleResolution` and `traceResolution`
      * @returns `undefined` if the path has no relevant implied format, `ModuleKind.ESNext` for esm format, and `ModuleKind.CommonJS` for cjs format

From 9b83a2ef040f8cdc538011273248bc6bb31e715c Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Tue, 6 Jul 2021 12:11:22 -0700
Subject: [PATCH 4/9] cts, mts, cjs, mjs, etc extension support

---
 src/compiler/builderState.ts                  |   2 +-
 src/compiler/checker.ts                       |  12 +
 src/compiler/commandLineParser.ts             |  45 +-
 src/compiler/diagnosticMessages.json          |   8 +
 src/compiler/emitter.ts                       |  34 +-
 src/compiler/moduleNameResolver.ts            |  57 +-
 src/compiler/moduleSpecifiers.ts              |   2 +-
 src/compiler/program.ts                       |  11 +-
 src/compiler/utilities.ts                     | 107 ++--
 src/compiler/watch.ts                         |   2 +
 src/compiler/watchUtilities.ts                |   2 +-
 src/executeCommandLine/executeCommandLine.ts  |   4 +-
 src/harness/compilerImpl.ts                   |   6 +-
 src/harness/fourslashImpl.ts                  |   3 +-
 src/harness/vpathUtil.ts                      |   2 +-
 src/server/watchType.ts                       |   2 -
 src/services/stringCompletions.ts             |   8 +-
 src/testRunner/unittests/moduleResolution.ts  |  10 +-
 src/testRunner/unittests/programApi.ts        |   2 +-
 .../unittests/tsbuild/moduleResolution.ts     |  90 ++++
 ...tionEmitInvalidReferenceAllowJs.errors.txt |   4 +-
 ...sFileCompilationWithMapFileAsJs.errors.txt |   4 +-
 ...hMapFileAsJsWithInlineSourceMap.errors.txt |   4 +-
 ...lationWithMapFileAsJsWithOutDir.errors.txt |   4 +-
 .../nodeModules1(module=node12).errors.txt    | 158 ++++++
 .../reference/nodeModules1(module=node12).js  | 265 ++++++++++
 .../nodeModules1(module=node12).symbols       | 285 +++++++++-
 .../nodeModules1(module=node12).types         | 325 ++++++++++++
 .../nodeModules1(module=nodenext).errors.txt  | 158 ++++++
 .../nodeModules1(module=nodenext).js          | 265 ++++++++++
 .../nodeModules1(module=nodenext).symbols     | 285 +++++++++-
 .../nodeModules1(module=nodenext).types       | 325 ++++++++++++
 ...eModulesAllowJs1(module=node12).errors.txt | 158 ++++++
 .../nodeModulesAllowJs1(module=node12).js     | 265 ++++++++++
 ...nodeModulesAllowJs1(module=node12).symbols | 285 +++++++++-
 .../nodeModulesAllowJs1(module=node12).types  | 325 ++++++++++++
 ...odulesAllowJs1(module=nodenext).errors.txt | 158 ++++++
 .../nodeModulesAllowJs1(module=nodenext).js   | 265 ++++++++++
 ...deModulesAllowJs1(module=nodenext).symbols | 285 +++++++++-
 ...nodeModulesAllowJs1(module=nodenext).types | 325 ++++++++++++
 ...esForbidenSyntax(module=node12).errors.txt | 139 +++++
 ...odeModulesForbidenSyntax(module=node12).js | 172 +++++++
 ...dulesForbidenSyntax(module=node12).symbols | 120 +++++
 ...ModulesForbidenSyntax(module=node12).types | 168 ++++++
 ...ForbidenSyntax(module=nodenext).errors.txt | 139 +++++
 ...eModulesForbidenSyntax(module=nodenext).js | 172 +++++++
 ...lesForbidenSyntax(module=nodenext).symbols | 120 +++++
 ...dulesForbidenSyntax(module=nodenext).types | 168 ++++++
 .../amd/invalidRootFile.errors.txt            |   8 +-
 .../node/invalidRootFile.errors.txt           |   8 +-
 ...t-correctly-with-cts-and-mts-extensions.js | 485 ++++++++++++++++++
 .../node/allowJs/nodeModulesAllowJs1.ts       | 105 ++++
 tests/cases/conformance/node/nodeModules1.ts  | 105 ++++
 .../node/nodeModulesForbidenSyntax.ts         |  67 +++
 54 files changed, 6364 insertions(+), 169 deletions(-)
 create mode 100644 tests/baselines/reference/nodeModules1(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModules1(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJs1(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).js
 create mode 100644 tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).symbols
 create mode 100644 tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).types
 create mode 100644 tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).errors.txt
 create mode 100644 tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).js
 create mode 100644 tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).symbols
 create mode 100644 tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).types
 create mode 100644 tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js
 create mode 100644 tests/cases/conformance/node/nodeModulesForbidenSyntax.ts

diff --git a/src/compiler/builderState.ts b/src/compiler/builderState.ts
index 779924a4c9d3a..f94c2086733a2 100644
--- a/src/compiler/builderState.ts
+++ b/src/compiler/builderState.ts
@@ -423,7 +423,7 @@ namespace ts {
                 );
                 const firstDts = firstOrUndefined(emitOutput.outputFiles);
                 if (firstDts) {
-                    Debug.assert(fileExtensionIs(firstDts.name, Extension.Dts), "File extension for signature expected to be dts", () => `Found: ${getAnyExtensionFromPath(firstDts.name)} for ${firstDts.name}:: All output files: ${JSON.stringify(emitOutput.outputFiles.map(f => f.name))}`);
+                    Debug.assert(fileExtensionIsOneOf(firstDts.name, [Extension.Dts, Extension.Dmts, Extension.Dcts]), "File extension for signature expected to be dts", () => `Found: ${getAnyExtensionFromPath(firstDts.name)} for ${firstDts.name}:: All output files: ${JSON.stringify(emitOutput.outputFiles.map(f => f.name))}`);
                     latestSignature = (computeHash || generateDjb2Hash)(firstDts.text);
                     if (exportedModulesMapCache && latestSignature !== prevSignature) {
                         updateExportedModules(sourceFile, emitOutput.exportedModulesFromDeclarationEmit, exportedModulesMapCache);
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 70196b6da2add..9345eb730f71a 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -30386,6 +30386,12 @@ namespace ts {
         }
 
         function checkAssertion(node: AssertionExpression) {
+            if (node.kind === SyntaxKind.TypeAssertionExpression) {
+                const file = getSourceFileOfNode(node);
+                if (file && fileExtensionIsOneOf(file.fileName, [Extension.Cts, Extension.Mts])) {
+                    grammarErrorOnNode(node, Diagnostics.This_syntax_is_reserved_in_files_with_this_extension_Use_an_as_expression_instead);
+                }
+            }
             return checkAssertionWorker(node, node.type, node.expression);
         }
 
@@ -41549,6 +41555,12 @@ namespace ts {
                 return false;
             }
 
+            if (node.typeParameters && !(length(node.typeParameters) > 1 || node.typeParameters.hasTrailingComma || node.typeParameters[0].constraint)) {
+                if (file && fileExtensionIsOneOf(file.fileName, [Extension.Mts, Extension.Cts])) {
+                    grammarErrorOnNode(node.typeParameters[0], Diagnostics.This_syntax_is_reserved_in_files_with_this_extension_Add_a_trailing_comma_or_explicit_constraint);
+                }
+            }
+
             const { equalsGreaterThanToken } = node;
             const startLine = getLineAndCharacterOfPosition(file, equalsGreaterThanToken.pos).line;
             const endLine = getLineAndCharacterOfPosition(file, equalsGreaterThanToken.end).line;
diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 49a0b71fdbe99..9d13f1db0cbb3 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -3214,7 +3214,7 @@ namespace ts {
 
         let jsonOnlyIncludeRegexes: readonly RegExp[] | undefined;
         if (validatedIncludeSpecs && validatedIncludeSpecs.length > 0) {
-            for (const file of host.readDirectory(basePath, supportedExtensionsWithJsonIfResolveJsonModule, validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined)) {
+            for (const file of host.readDirectory(basePath, flatten(supportedExtensionsWithJsonIfResolveJsonModule), validatedExcludeSpecs, validatedIncludeSpecs, /*depth*/ undefined)) {
                 if (fileExtensionIs(file, Extension.Json)) {
                     // Valid only if *.json specified
                     if (!jsonOnlyIncludeRegexes) {
@@ -3439,16 +3439,24 @@ namespace ts {
      * extension priority.
      *
      * @param file The path to the file.
-     * @param extensionPriority The priority of the extension.
-     * @param context The expansion context.
      */
-    function hasFileWithHigherPriorityExtension(file: string, literalFiles: ESMap<string, string>, wildcardFiles: ESMap<string, string>, extensions: readonly string[], keyMapper: (value: string) => string) {
-        const extensionPriority = getExtensionPriority(file, extensions);
-        const adjustedExtensionPriority = adjustExtensionPriority(extensionPriority, extensions);
-        for (let i = ExtensionPriority.Highest; i < adjustedExtensionPriority; i++) {
-            const higherPriorityExtension = extensions[i];
-            const higherPriorityPath = keyMapper(changeExtension(file, higherPriorityExtension));
+    function hasFileWithHigherPriorityExtension(file: string, literalFiles: ESMap<string, string>, wildcardFiles: ESMap<string, string>, extensions: readonly string[][], keyMapper: (value: string) => string) {
+        const extensionGroup = forEach(extensions, group => fileExtensionIsOneOf(file, group) ? group : undefined);
+        if (!extensionGroup) {
+            return false;
+        }
+        for (const ext of extensionGroup) {
+            if (fileExtensionIs(file, ext)) {
+                break;
+            }
+            const higherPriorityPath = keyMapper(changeExtension(file, ext));
             if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
+                if (ext === Extension.Dts && (fileExtensionIs(file, Extension.Js) || fileExtensionIs(file, Extension.Jsx))) {
+                    // LEGACY BEHAVIOR: An off-by-one bug somewhere in the extension priority system for wildcard module loading allowed declaration
+                    // files to be loaded alongside their js(x) counterparts. We regard this as generally undesirable, but retain the behavior to
+                    // prevent breakage.
+                    continue;
+                }
                 return true;
             }
         }
@@ -3461,15 +3469,18 @@ namespace ts {
      * already been included.
      *
      * @param file The path to the file.
-     * @param extensionPriority The priority of the extension.
-     * @param context The expansion context.
      */
-    function removeWildcardFilesWithLowerPriorityExtension(file: string, wildcardFiles: ESMap<string, string>, extensions: readonly string[], keyMapper: (value: string) => string) {
-        const extensionPriority = getExtensionPriority(file, extensions);
-        const nextExtensionPriority = getNextLowestExtensionPriority(extensionPriority, extensions);
-        for (let i = nextExtensionPriority; i < extensions.length; i++) {
-            const lowerPriorityExtension = extensions[i];
-            const lowerPriorityPath = keyMapper(changeExtension(file, lowerPriorityExtension));
+    function removeWildcardFilesWithLowerPriorityExtension(file: string, wildcardFiles: ESMap<string, string>, extensions: readonly string[][], keyMapper: (value: string) => string) {
+        const extensionGroup = forEach(extensions, group => fileExtensionIsOneOf(file, group) ? group : undefined);
+        if (!extensionGroup) {
+            return;
+        }
+        for (let i = extensionGroup.length - 1; i >= 0; i--) {
+            const ext = extensionGroup[i];
+            if (fileExtensionIs(file, ext)) {
+                break;
+            }
+            const lowerPriorityPath = keyMapper(changeExtension(file, ext));
             wildcardFiles.delete(lowerPriorityPath);
         }
     }
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index a199dab5bb579..2c16ea3f137a6 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -5975,6 +5975,14 @@
         "category": "Error",
         "code": 7057
     },
+    "This syntax is reserved in files with this extension. Use an `as` expression instead.": {
+        "category": "Error",
+        "code": 7058
+    },
+    "This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.": {
+        "category": "Error",
+        "code": 7059
+    },
 
     "You cannot rename this element.": {
         "category": "Error",
diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 5667e792b4606..943dd14836e78 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -89,7 +89,7 @@ namespace ts {
             return getOutputPathsForBundle(options, forceDtsPaths);
         }
         else {
-            const ownOutputFilePath = getOwnEmitOutputFilePath(sourceFile.fileName, host, getOutputExtension(sourceFile, options));
+            const ownOutputFilePath = getOwnEmitOutputFilePath(sourceFile.fileName, host, getOutputExtension(sourceFile.fileName, options));
             const isJsonFile = isJsonSourceFile(sourceFile);
             // If json file emits to the same location skip writing it, if emitDeclarationOnly skip writing it
             const isJsonEmittedToSameLocation = isJsonFile &&
@@ -106,26 +106,23 @@ namespace ts {
         return (options.sourceMap && !options.inlineSourceMap) ? jsFilePath + ".map" : undefined;
     }
 
-    // JavaScript files are always LanguageVariant.JSX, as JSX syntax is allowed in .js files also.
-    // So for JavaScript files, '.jsx' is only emitted if the input was '.jsx', and JsxEmit.Preserve.
-    // For TypeScript, the only time to emit with a '.jsx' extension, is on JSX input, and JsxEmit.Preserve
     /* @internal */
-    export function getOutputExtension(sourceFile: SourceFile, options: CompilerOptions): Extension {
-        if (isJsonSourceFile(sourceFile)) {
+    export function getOutputExtension(fileName: string, options: CompilerOptions): Extension {
+        if (fileExtensionIs(fileName, Extension.Json)) {
             return Extension.Json;
         }
 
         if (options.jsx === JsxEmit.Preserve) {
-            if (isSourceFileJS(sourceFile)) {
-                if (fileExtensionIs(sourceFile.fileName, Extension.Jsx)) {
-                    return Extension.Jsx;
-                }
-            }
-            else if (sourceFile.languageVariant === LanguageVariant.JSX) {
-                // TypeScript source file preserving JSX syntax
+            if (fileExtensionIsOneOf(fileName, [Extension.Jsx, Extension.Tsx])) {
                 return Extension.Jsx;
             }
         }
+        if (fileExtensionIsOneOf(fileName, [Extension.Mts, Extension.Mjs])) {
+            return Extension.Mjs;
+        }
+        if (fileExtensionIsOneOf(fileName, [Extension.Cts, Extension.Cjs])) {
+            return Extension.Cjs;
+        }
         return Extension.Js;
     }
 
@@ -140,10 +137,9 @@ namespace ts {
 
     /* @internal */
     export function getOutputDeclarationFileName(inputFileName: string, configFile: ParsedCommandLine, ignoreCase: boolean, getCommonSourceDirectory?: () => string) {
-        Debug.assert(!fileExtensionIs(inputFileName, Extension.Dts) && !fileExtensionIs(inputFileName, Extension.Json));
         return changeExtension(
             getOutputPathWithoutChangingExt(inputFileName, configFile, ignoreCase, configFile.options.declarationDir || configFile.options.outDir, getCommonSourceDirectory),
-            Extension.Dts
+            getDeclarationEmitExtensionForPath(inputFileName)
         );
     }
 
@@ -152,11 +148,7 @@ namespace ts {
         const isJsonFile = fileExtensionIs(inputFileName, Extension.Json);
         const outputFileName = changeExtension(
             getOutputPathWithoutChangingExt(inputFileName, configFile, ignoreCase, configFile.options.outDir, getCommonSourceDirectory),
-            isJsonFile ?
-                Extension.Json :
-                configFile.options.jsx === JsxEmit.Preserve && (fileExtensionIs(inputFileName, Extension.Tsx) || fileExtensionIs(inputFileName, Extension.Jsx)) ?
-                    Extension.Jsx :
-                    Extension.Js
+            getOutputExtension(inputFileName, configFile.options)
         );
         return !isJsonFile || comparePaths(inputFileName, outputFileName, Debug.checkDefined(configFile.options.configFilePath), ignoreCase) !== Comparison.EqualTo ?
             outputFileName :
@@ -238,7 +230,7 @@ namespace ts {
     export function getCommonSourceDirectoryOfConfig({ options, fileNames }: ParsedCommandLine, ignoreCase: boolean): string {
         return getCommonSourceDirectory(
             options,
-            () => filter(fileNames, file => !(options.noEmitForJsFiles && fileExtensionIsOneOf(file, supportedJSExtensions)) && !fileExtensionIs(file, Extension.Dts)),
+            () => filter(fileNames, file => !(options.noEmitForJsFiles && fileExtensionIsOneOf(file, supportedJSExtensionsFlat)) && !fileExtensionIs(file, Extension.Dts)),
             getDirectoryPath(normalizeSlashes(Debug.checkDefined(options.configFilePath))),
             createGetCanonicalFileName(!ignoreCase)
         );
diff --git a/src/compiler/moduleNameResolver.ts b/src/compiler/moduleNameResolver.ts
index ab5f754e9eeb3..acd31c36b391c 100644
--- a/src/compiler/moduleNameResolver.ts
+++ b/src/compiler/moduleNameResolver.ts
@@ -1244,11 +1244,12 @@ namespace ts {
     function loadModuleFromFile(extensions: Extensions, candidate: string, onlyRecordFailures: boolean, state: ModuleResolutionState): PathAndExtension | undefined {
         if (extensions === Extensions.Json || extensions === Extensions.TSConfig) {
             const extensionLess = tryRemoveExtension(candidate, Extension.Json);
-            return (extensionLess === undefined && extensions === Extensions.Json) ? undefined : tryAddingExtensions(extensionLess || candidate, extensions, onlyRecordFailures, state);
+            const extension = extensionLess ? candidate.substring(extensionLess.length) : "";
+            return (extensionLess === undefined && extensions === Extensions.Json) ? undefined : tryAddingExtensions(extensionLess || candidate, extensions, extension, onlyRecordFailures, state);
         }
 
         // First, try adding an extension. An import of "foo" could be matched by a file "foo.ts", or "foo.js" by "foo.js.ts"
-        const resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, onlyRecordFailures, state);
+        const resolvedByAddingExtension = tryAddingExtensions(candidate, extensions, "", onlyRecordFailures, state);
         if (resolvedByAddingExtension) {
             return resolvedByAddingExtension;
         }
@@ -1257,16 +1258,16 @@ namespace ts {
         // e.g. "./foo.js" can be matched by "./foo.ts" or "./foo.d.ts"
         if (hasJSFileExtension(candidate)) {
             const extensionless = removeFileExtension(candidate);
+            const extension = candidate.substring(extensionless.length);
             if (state.traceEnabled) {
-                const extension = candidate.substring(extensionless.length);
                 trace(state.host, Diagnostics.File_name_0_has_a_1_extension_stripping_it, candidate, extension);
             }
-            return tryAddingExtensions(extensionless, extensions, onlyRecordFailures, state);
+            return tryAddingExtensions(extensionless, extensions, extension, onlyRecordFailures, state);
         }
     }
 
     /** Try to return an existing file that adds one of the `extensions` to `candidate`. */
-    function tryAddingExtensions(candidate: string, extensions: Extensions, onlyRecordFailures: boolean, state: ModuleResolutionState): PathAndExtension | undefined {
+    function tryAddingExtensions(candidate: string, extensions: Extensions, originalExtension: string, onlyRecordFailures: boolean, state: ModuleResolutionState): PathAndExtension | undefined {
         if (!onlyRecordFailures) {
             // check if containing folder exists - if it doesn't then just record failures for all supported extensions without disk probing
             const directory = getDirectoryPath(candidate);
@@ -1277,11 +1278,51 @@ namespace ts {
 
         switch (extensions) {
             case Extensions.DtsOnly:
-                return tryExtension(Extension.Dts);
+                switch (originalExtension) {
+                    case Extension.Mjs:
+                    case Extension.Mts:
+                    case Extension.Dmts:
+                        return tryExtension(Extension.Dmts);
+                    case Extension.Cjs:
+                    case Extension.Cts:
+                    case Extension.Dcts:
+                        return tryExtension(Extension.Dcts);
+                    case Extension.Json:
+                        candidate += Extension.Json;
+                        return tryExtension(Extension.Dts);
+                    default: return tryExtension(Extension.Dts);
+                }
             case Extensions.TypeScript:
-                return tryExtension(Extension.Ts) || tryExtension(Extension.Tsx) || tryExtension(Extension.Dts);
+                switch (originalExtension) {
+                    case Extension.Mjs:
+                    case Extension.Mts:
+                    case Extension.Dmts:
+                        return tryExtension(Extension.Mts) || tryExtension(Extension.Dmts);
+                    case Extension.Cjs:
+                    case Extension.Cts:
+                    case Extension.Dcts:
+                        return tryExtension(Extension.Cts) || tryExtension(Extension.Dcts);
+                    case Extension.Json:
+                        candidate += Extension.Json;
+                        return tryExtension(Extension.Dts);
+                    default:
+                        return tryExtension(Extension.Ts) || tryExtension(Extension.Tsx) || tryExtension(Extension.Dts);
+                }
             case Extensions.JavaScript:
-                return tryExtension(Extension.Js) || tryExtension(Extension.Jsx);
+                switch (originalExtension) {
+                    case Extension.Mjs:
+                    case Extension.Mts:
+                    case Extension.Dmts:
+                        return tryExtension(Extension.Mjs);
+                    case Extension.Cjs:
+                    case Extension.Cts:
+                    case Extension.Dcts:
+                        return tryExtension(Extension.Cjs);
+                    case Extension.Json:
+                        return tryExtension(Extension.Json);
+                    default:
+                        return tryExtension(Extension.Js) || tryExtension(Extension.Jsx);
+                }
             case Extensions.TSConfig:
             case Extensions.Json:
                 return tryExtension(Extension.Json);
diff --git a/src/compiler/moduleSpecifiers.ts b/src/compiler/moduleSpecifiers.ts
index de42460d54aeb..8bfffcffb82ef 100644
--- a/src/compiler/moduleSpecifiers.ts
+++ b/src/compiler/moduleSpecifiers.ts
@@ -652,7 +652,7 @@ namespace ts.moduleSpecifiers {
     function tryGetAnyFileFromPath(host: ModuleSpecifierResolutionHost, path: string) {
         if (!host.fileExists) return;
         // We check all js, `node` and `json` extensions in addition to TS, since node module resolution would also choose those over the directory
-        const extensions = getSupportedExtensions({ allowJs: true }, [{ extension: "node", isMixedContent: false }, { extension: "json", isMixedContent: false, scriptKind: ScriptKind.JSON }]);
+        const extensions = flatten(getSupportedExtensions({ allowJs: true }, [{ extension: "node", isMixedContent: false }, { extension: "json", isMixedContent: false, scriptKind: ScriptKind.JSON }]));
         for (const e of extensions) {
             const fullPath = path + e;
             if (host.fileExists(fullPath)) {
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index d529b73ffacb5..f3c3452fee9dd 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -2466,13 +2466,13 @@ namespace ts {
 
             if (hasExtension(fileName)) {
                 const canonicalFileName = host.getCanonicalFileName(fileName);
-                if (!options.allowNonTsExtensions && !forEach(supportedExtensionsWithJsonIfResolveJsonModule, extension => fileExtensionIs(canonicalFileName, extension))) {
+                if (!options.allowNonTsExtensions && !forEach(flatten(supportedExtensionsWithJsonIfResolveJsonModule), extension => fileExtensionIs(canonicalFileName, extension))) {
                     if (fail) {
                         if (hasJSFileExtension(canonicalFileName)) {
                             fail(Diagnostics.File_0_is_a_JavaScript_file_Did_you_mean_to_enable_the_allowJs_option, fileName);
                         }
                         else {
-                            fail(Diagnostics.File_0_has_an_unsupported_extension_The_only_supported_extensions_are_1, fileName, "'" + supportedExtensions.join("', '") + "'");
+                            fail(Diagnostics.File_0_has_an_unsupported_extension_The_only_supported_extensions_are_1, fileName, "'" + flatten(supportedExtensions).join("', '") + "'");
                         }
                     }
                     return undefined;
@@ -2504,8 +2504,9 @@ namespace ts {
                     return undefined;
                 }
 
-                const sourceFileWithAddedExtension = forEach(supportedExtensions, extension => getSourceFile(fileName + extension));
-                if (fail && !sourceFileWithAddedExtension) fail(Diagnostics.Could_not_resolve_the_path_0_with_the_extensions_Colon_1, fileName, "'" + supportedExtensions.join("', '") + "'");
+                // Only try adding extensions from the first supported group (which should be .ts/.tsx/.d.ts)
+                const sourceFileWithAddedExtension = forEach(supportedExtensions[0], extension => getSourceFile(fileName + extension));
+                if (fail && !sourceFileWithAddedExtension) fail(Diagnostics.Could_not_resolve_the_path_0_with_the_extensions_Colon_1, fileName, "'" + flatten(supportedExtensions).join("', '") + "'");
                 return sourceFileWithAddedExtension;
             }
         }
@@ -3704,7 +3705,7 @@ namespace ts {
                 return containsPath(options.outDir, filePath, currentDirectory, !host.useCaseSensitiveFileNames());
             }
 
-            if (fileExtensionIsOneOf(filePath, supportedJSExtensions) || fileExtensionIs(filePath, Extension.Dts)) {
+            if (fileExtensionIsOneOf(filePath, supportedJSExtensionsFlat) || fileExtensionIs(filePath, Extension.Dts)) {
                 // Otherwise just check if sourceFile with the name exists
                 const filePathWithoutExtension = removeFileExtension(filePath);
                 return !!getSourceFileByPath((filePathWithoutExtension + Extension.Ts) as Path) ||
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index df03bfa8d743d..477fbba6fd016 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -4234,7 +4234,15 @@ namespace ts {
         const path = outputDir
             ? getSourceFilePathInNewDirWorker(fileName, outputDir, currentDirectory, commonSourceDirectory, getCanonicalFileName)
             : fileName;
-        return removeFileExtension(path) + Extension.Dts;
+        const declarationExtension = getDeclarationEmitExtensionForPath(path);
+        return removeFileExtension(path) + declarationExtension;
+    }
+
+    export function getDeclarationEmitExtensionForPath(path: string) {
+        return fileExtensionIsOneOf(path, [Extension.Mjs, Extension.Mts]) ? Extension.Dmts :
+            fileExtensionIsOneOf(path, [Extension.Cjs, Extension.Cts]) ? Extension.Dcts :
+            fileExtensionIsOneOf(path, [Extension.Json]) ? `.json.d.ts` : // Drive-by redefinition of json declaration file output name so if it's ever enabled, it behaves well
+            Extension.Dts;
     }
 
     export function outFile(options: CompilerOptions) {
@@ -6702,37 +6710,42 @@ namespace ts {
     /**
      *  List of supported extensions in order of file resolution precedence.
      */
-    export const supportedTSExtensions: readonly Extension[] = [Extension.Ts, Extension.Tsx, Extension.Dts];
-    export const supportedTSExtensionsWithJson: readonly Extension[] = [Extension.Ts, Extension.Tsx, Extension.Dts, Extension.Json];
+    export const supportedTSExtensions: readonly Extension[][] = [[Extension.Ts, Extension.Tsx, Extension.Dts], [Extension.Cts, Extension.Dcts], [Extension.Mts, Extension.Dmts]];
+    export const supportedTSExtensionsFlat: readonly Extension[] = flatten(supportedTSExtensions);
+    const supportedTSExtensionsWithJson: readonly Extension[][] = [...supportedTSExtensions, [Extension.Json]];
     /** Must have ".d.ts" first because if ".ts" goes first, that will be detected as the extension instead of ".d.ts". */
-    export const supportedTSExtensionsForExtractExtension: readonly Extension[] = [Extension.Dts, Extension.Ts, Extension.Tsx];
-    export const supportedJSExtensions: readonly Extension[] = [Extension.Js, Extension.Jsx];
-    export const supportedJSAndJsonExtensions: readonly Extension[] = [Extension.Js, Extension.Jsx, Extension.Json];
-    const allSupportedExtensions: readonly Extension[] = [...supportedTSExtensions, ...supportedJSExtensions];
-    const allSupportedExtensionsWithJson: readonly Extension[] = [...supportedTSExtensions, ...supportedJSExtensions, Extension.Json];
-
-    export function getSupportedExtensions(options?: CompilerOptions): readonly Extension[];
-    export function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: readonly FileExtensionInfo[]): readonly string[];
-    export function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: readonly FileExtensionInfo[]): readonly string[] {
+    const supportedTSExtensionsForExtractExtension: readonly Extension[] = [Extension.Dts, Extension.Dcts, Extension.Dmts, Extension.Cts, Extension.Mts, Extension.Ts, Extension.Tsx, Extension.Cts, Extension.Mts];
+    export const supportedJSExtensions: readonly Extension[][] = [[Extension.Js, Extension.Jsx], [Extension.Mjs], [Extension.Cjs]];
+    export const supportedJSExtensionsFlat: readonly Extension[] = flatten(supportedJSExtensions);
+    const allSupportedExtensions: readonly Extension[][] = [[Extension.Ts, Extension.Tsx, Extension.Dts, Extension.Js, Extension.Jsx], [Extension.Cts, Extension.Dcts, Extension.Cjs], [Extension.Mts, Extension.Dmts, Extension.Mjs]];
+    const allSupportedExtensionsWithJson: readonly Extension[][] = [...allSupportedExtensions, [Extension.Json]];
+
+    export function getSupportedExtensions(options?: CompilerOptions): readonly Extension[][];
+    export function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: readonly FileExtensionInfo[]): readonly string[][];
+    export function getSupportedExtensions(options?: CompilerOptions, extraFileExtensions?: readonly FileExtensionInfo[]): readonly string[][] {
         const needJsExtensions = options && getAllowJSCompilerOption(options);
 
         if (!extraFileExtensions || extraFileExtensions.length === 0) {
             return needJsExtensions ? allSupportedExtensions : supportedTSExtensions;
         }
 
+        const builtins = needJsExtensions ? allSupportedExtensions : supportedTSExtensions;
+        const flatBuiltins = flatten(builtins);
         const extensions = [
-            ...needJsExtensions ? allSupportedExtensions : supportedTSExtensions,
-            ...mapDefined(extraFileExtensions, x => x.scriptKind === ScriptKind.Deferred || needJsExtensions && isJSLike(x.scriptKind) ? x.extension : undefined)
+            ...builtins,
+            ...mapDefined(extraFileExtensions, x => x.scriptKind === ScriptKind.Deferred || needJsExtensions && isJSLike(x.scriptKind) && flatBuiltins.indexOf(x.extension as Extension) === -1 ? [x.extension] : undefined)
         ];
 
-        return deduplicate<string>(extensions, equateStringsCaseSensitive, compareStringsCaseSensitive);
+        return extensions;
     }
 
-    export function getSuppoertedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly string[]): readonly string[] {
+    export function getSuppoertedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly Extension[][]): readonly Extension[][];
+    export function getSuppoertedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly string[][]): readonly string[][];
+    export function getSuppoertedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly string[][]): readonly string[][] {
         if (!options || !options.resolveJsonModule) { return supportedExtensions; }
         if (supportedExtensions === allSupportedExtensions) { return allSupportedExtensionsWithJson; }
         if (supportedExtensions === supportedTSExtensions) { return supportedTSExtensionsWithJson; }
-        return [...supportedExtensions, Extension.Json];
+        return [...supportedExtensions, [Extension.Json]];
     }
 
     function isJSLike(scriptKind: ScriptKind | undefined): boolean {
@@ -6740,18 +6753,18 @@ namespace ts {
     }
 
     export function hasJSFileExtension(fileName: string): boolean {
-        return some(supportedJSExtensions, extension => fileExtensionIs(fileName, extension));
+        return some(supportedJSExtensionsFlat, extension => fileExtensionIs(fileName, extension));
     }
 
     export function hasTSFileExtension(fileName: string): boolean {
-        return some(supportedTSExtensions, extension => fileExtensionIs(fileName, extension));
+        return some(supportedTSExtensionsFlat, extension => fileExtensionIs(fileName, extension));
     }
 
     export function isSupportedSourceFileName(fileName: string, compilerOptions?: CompilerOptions, extraFileExtensions?: readonly FileExtensionInfo[]) {
         if (!fileName) { return false; }
 
         const supportedExtensions = getSupportedExtensions(compilerOptions, extraFileExtensions);
-        for (const extension of getSuppoertedExtensionsWithJsonIfResolveJsonModule(compilerOptions, supportedExtensions)) {
+        for (const extension of flatten(getSuppoertedExtensionsWithJsonIfResolveJsonModule(compilerOptions, supportedExtensions))) {
             if (fileExtensionIs(fileName, extension)) {
                 return true;
             }
@@ -6771,59 +6784,7 @@ namespace ts {
         );
     }
 
-    /**
-     * Extension boundaries by priority. Lower numbers indicate higher priorities, and are
-     * aligned to the offset of the highest priority extension in the
-     * allSupportedExtensions array.
-     */
-    export const enum ExtensionPriority {
-        TypeScriptFiles = 0,
-        DeclarationAndJavaScriptFiles = 2,
-
-        Highest = TypeScriptFiles,
-        Lowest = DeclarationAndJavaScriptFiles,
-    }
-
-    export function getExtensionPriority(path: string, supportedExtensions: readonly string[]): ExtensionPriority {
-        for (let i = supportedExtensions.length - 1; i >= 0; i--) {
-            if (fileExtensionIs(path, supportedExtensions[i])) {
-                return adjustExtensionPriority(i as ExtensionPriority, supportedExtensions);
-            }
-        }
-
-        // If its not in the list of supported extensions, this is likely a
-        // TypeScript file with a non-ts extension
-        return ExtensionPriority.Highest;
-    }
-
-    /**
-     * Adjusts an extension priority to be the highest priority within the same range.
-     */
-    export function adjustExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: readonly string[]): ExtensionPriority {
-        if (extensionPriority < ExtensionPriority.DeclarationAndJavaScriptFiles) {
-            return ExtensionPriority.TypeScriptFiles;
-        }
-        else if (extensionPriority < supportedExtensions.length) {
-            return ExtensionPriority.DeclarationAndJavaScriptFiles;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-
-    /**
-     * Gets the next lowest extension priority for a given priority.
-     */
-    export function getNextLowestExtensionPriority(extensionPriority: ExtensionPriority, supportedExtensions: readonly string[]): ExtensionPriority {
-        if (extensionPriority < ExtensionPriority.DeclarationAndJavaScriptFiles) {
-            return ExtensionPriority.DeclarationAndJavaScriptFiles;
-        }
-        else {
-            return supportedExtensions.length;
-        }
-    }
-
-    const extensionsToRemove = [Extension.Dts, Extension.Ts, Extension.Js, Extension.Tsx, Extension.Jsx, Extension.Json];
+    const extensionsToRemove = [Extension.Dts, Extension.Dmts, Extension.Dcts, Extension.Mjs, Extension.Mts, Extension.Cjs, Extension.Cts, Extension.Ts, Extension.Js, Extension.Tsx, Extension.Jsx, Extension.Json];
     export function removeFileExtension(path: string): string {
         for (const ext of extensionsToRemove) {
             const extensionless = tryRemoveExtension(path, ext);
diff --git a/src/compiler/watch.ts b/src/compiler/watch.ts
index d444e63c800c9..d3a44d9231a83 100644
--- a/src/compiler/watch.ts
+++ b/src/compiler/watch.ts
@@ -418,6 +418,7 @@ namespace ts {
         ConfigFileOfReferencedProject: "Config file of referened project",
         ExtendedConfigOfReferencedProject: "Extended config file of referenced project",
         WildcardDirectoryOfReferencedProject: "Wild card directory of referenced project",
+        PackageJsonFile: "package.json file for import suggestions",
     };
 
     export interface WatchTypeRegistry {
@@ -431,6 +432,7 @@ namespace ts {
         ConfigFileOfReferencedProject: "Config file of referened project",
         ExtendedConfigOfReferencedProject: "Extended config file of referenced project",
         WildcardDirectoryOfReferencedProject: "Wild card directory of referenced project",
+        PackageJsonFile: "package.json file for import suggestions",
     }
 
     interface WatchFactory<X, Y = undefined> extends ts.WatchFactory<X, Y> {
diff --git a/src/compiler/watchUtilities.ts b/src/compiler/watchUtilities.ts
index 39256b39acb68..7e13212596323 100644
--- a/src/compiler/watchUtilities.ts
+++ b/src/compiler/watchUtilities.ts
@@ -480,7 +480,7 @@ namespace ts {
             // If its declaration directory: its not ignored if not excluded by config
             if (options.declarationDir) return false;
         }
-        else if (!fileExtensionIsOneOf(fileOrDirectoryPath, supportedJSExtensions)) {
+        else if (!fileExtensionIsOneOf(fileOrDirectoryPath, supportedJSExtensionsFlat)) {
             return false;
         }
 
diff --git a/src/executeCommandLine/executeCommandLine.ts b/src/executeCommandLine/executeCommandLine.ts
index 888172b87325e..a6979376e3a6f 100644
--- a/src/executeCommandLine/executeCommandLine.ts
+++ b/src/executeCommandLine/executeCommandLine.ts
@@ -43,10 +43,10 @@ namespace ts {
         }
 
         const path = file.path;
-        if (fileExtensionIsOneOf(path, supportedTSExtensions)) {
+        if (fileExtensionIsOneOf(path, supportedTSExtensionsFlat)) {
             return "TypeScript";
         }
-        else if (fileExtensionIsOneOf(path, supportedJSExtensions)) {
+        else if (fileExtensionIsOneOf(path, supportedJSExtensionsFlat)) {
             return "JavaScript";
         }
         else if (fileExtensionIs(path, Extension.Json)) {
diff --git a/src/harness/compilerImpl.ts b/src/harness/compilerImpl.ts
index 7d42ccea2c0bd..9f7c1503ae8fb 100644
--- a/src/harness/compilerImpl.ts
+++ b/src/harness/compilerImpl.ts
@@ -118,11 +118,11 @@ namespace compiler {
                             const input = new documents.TextDocument(sourceFile.fileName, sourceFile.text);
                             this._inputs.push(input);
                             if (!vpath.isDeclaration(sourceFile.fileName)) {
-                                const extname = ts.getOutputExtension(sourceFile, this.options);
+                                const extname = ts.getOutputExtension(sourceFile.fileName, this.options);
                                 const outputs: CompilationOutput = {
                                     inputs: [input],
                                     js: js.get(this.getOutputPath(sourceFile.fileName, extname)),
-                                    dts: dts.get(this.getOutputPath(sourceFile.fileName, ".d.ts")),
+                                    dts: dts.get(this.getOutputPath(sourceFile.fileName, ts.getDeclarationEmitExtensionForPath(sourceFile.fileName))),
                                     map: maps.get(this.getOutputPath(sourceFile.fileName, extname + ".map"))
                                 };
 
@@ -205,7 +205,7 @@ namespace compiler {
             }
             else {
                 path = vpath.resolve(this.vfs.cwd(), path);
-                const outDir = ext === ".d.ts" ? this.options.declarationDir || this.options.outDir : this.options.outDir;
+                const outDir = ext === ".d.ts" || ext === ".json.d.ts" || ext === ".d.mts" || ext === ".d.cts" ? this.options.declarationDir || this.options.outDir : this.options.outDir;
                 if (outDir) {
                     const common = this.commonSourceDirectory;
                     if (common) {
diff --git a/src/harness/fourslashImpl.ts b/src/harness/fourslashImpl.ts
index af75c48f0bae0..d2953bcd1ad2c 100644
--- a/src/harness/fourslashImpl.ts
+++ b/src/harness/fourslashImpl.ts
@@ -313,12 +313,13 @@ namespace FourSlash {
                     this.addMatchedInputFile(referenceFilePath, /* extensions */ undefined);
                 });
 
+                const exts = ts.flatten(ts.getSupportedExtensions(compilationOptions));
                 // Add import files into language-service host
                 ts.forEach(importedFiles, importedFile => {
                     // Fourslash insert tests/cases/fourslash into inputFile.unitName and import statement doesn't require ".ts"
                     // so convert them before making appropriate comparison
                     const importedFilePath = this.basePath + "/" + importedFile.fileName;
-                    this.addMatchedInputFile(importedFilePath, ts.getSupportedExtensions(compilationOptions));
+                    this.addMatchedInputFile(importedFilePath, exts);
                 });
 
                 // Check if no-default-lib flag is false and if so add default library
diff --git a/src/harness/vpathUtil.ts b/src/harness/vpathUtil.ts
index 31419e976fffb..44ef5b0f6af3f 100644
--- a/src/harness/vpathUtil.ts
+++ b/src/harness/vpathUtil.ts
@@ -108,7 +108,7 @@ namespace vpath {
     }
 
     export function isDeclaration(path: string) {
-        return extname(path, ".d.ts", /*ignoreCase*/ false).length > 0;
+        return ts.fileExtensionIsOneOf(path, [ts.Extension.Dmts, ts.Extension.Dcts, ts.Extension.Dts]);
     }
 
     export function isSourceMap(path: string) {
diff --git a/src/server/watchType.ts b/src/server/watchType.ts
index 2b9edafb09870..7893de0e26bc1 100644
--- a/src/server/watchType.ts
+++ b/src/server/watchType.ts
@@ -8,7 +8,6 @@ namespace ts {
         MissingSourceMapFile: "Missing source map file",
         NoopConfigFileForInferredRoot: "Noop Config file for the inferred project root",
         MissingGeneratedFile: "Missing generated file",
-        PackageJsonFile: "package.json file for import suggestions",
         NodeModulesForModuleSpecifierCache: "node_modules for module specifier cache invalidation",
     }
     WatchType.ClosedScriptInfo = "Closed Script info";
@@ -17,5 +16,4 @@ namespace ts {
     WatchType.MissingSourceMapFile = "Missing source map file";
     WatchType.NoopConfigFileForInferredRoot = "Noop Config file for the inferred project root";
     WatchType.MissingGeneratedFile = "Missing generated file";
-    WatchType.PackageJsonFile = "package.json file for import suggestions";
 }
diff --git a/src/services/stringCompletions.ts b/src/services/stringCompletions.ts
index 9255898ca7289..944b61b885ebd 100644
--- a/src/services/stringCompletions.ts
+++ b/src/services/stringCompletions.ts
@@ -330,7 +330,7 @@ namespace ts.Completions.StringCompletions {
         readonly includeExtensionsOption: IncludeExtensionsOption;
     }
     function getExtensionOptions(compilerOptions: CompilerOptions, includeExtensionsOption = IncludeExtensionsOption.Exclude): ExtensionOptions {
-        return { extensions: getSupportedExtensionsForModuleResolution(compilerOptions), includeExtensionsOption };
+        return { extensions: flatten(getSupportedExtensionsForModuleResolution(compilerOptions)), includeExtensionsOption };
     }
     function getCompletionEntriesForRelativeModules(literalValue: string, scriptDirectory: string, compilerOptions: CompilerOptions, host: LanguageServiceHost, scriptPath: Path, preferences: UserPreferences) {
         const includeExtensions = preferences.importModuleSpecifierEnding === "js" ? IncludeExtensionsOption.ModuleSpecifierCompletion : IncludeExtensionsOption.Exclude;
@@ -344,10 +344,10 @@ namespace ts.Completions.StringCompletions {
         }
     }
 
-    function getSupportedExtensionsForModuleResolution(compilerOptions: CompilerOptions): readonly Extension[] {
+    function getSupportedExtensionsForModuleResolution(compilerOptions: CompilerOptions): readonly Extension[][] {
         const extensions = getSupportedExtensions(compilerOptions);
-        return compilerOptions.resolveJsonModule && getEmitModuleResolutionKind(compilerOptions) === ModuleResolutionKind.NodeJs ?
-            extensions.concat(Extension.Json) :
+        return getEmitModuleResolutionKind(compilerOptions) === ModuleResolutionKind.NodeJs ?
+            getSuppoertedExtensionsWithJsonIfResolveJsonModule(compilerOptions, extensions) :
             extensions;
     }
 
diff --git a/src/testRunner/unittests/moduleResolution.ts b/src/testRunner/unittests/moduleResolution.ts
index e9f44a9e6bb77..37de920604105 100644
--- a/src/testRunner/unittests/moduleResolution.ts
+++ b/src/testRunner/unittests/moduleResolution.ts
@@ -81,9 +81,11 @@ namespace ts {
     }
 
     describe("unittests:: moduleResolution:: Node module resolution - relative paths", () => {
-
+        // node module resolution does _not_ implicitly append these extensions to an extensionless path (though will still attempt to load them if explicitly)
+        const nonImplicitExtensions = [Extension.Mts, Extension.Dmts, Extension.Mjs, Extension.Cts, Extension.Dcts, Extension.Cjs];
+        const autoExtensions = filter(supportedTSExtensionsFlat, e => nonImplicitExtensions.indexOf(e) === -1);
         function testLoadAsFile(containingFileName: string, moduleFileNameNoExt: string, moduleName: string): void {
-            for (const ext of supportedTSExtensions) {
+            for (const ext of autoExtensions) {
                 test(ext, /*hasDirectoryExists*/ false);
                 test(ext, /*hasDirectoryExists*/ true);
             }
@@ -96,7 +98,7 @@ namespace ts {
 
                 const failedLookupLocations: string[] = [];
                 const dir = getDirectoryPath(containingFileName);
-                for (const e of supportedTSExtensions) {
+                for (const e of autoExtensions) {
                     if (e === ext) {
                         break;
                     }
@@ -137,7 +139,7 @@ namespace ts {
                 const resolution = nodeModuleNameResolver(moduleName, containingFile.name, {}, createModuleResolutionHost(hasDirectoryExists, containingFile, packageJson, moduleFile));
                 checkResolvedModule(resolution.resolvedModule, createResolvedModule(moduleFile.name));
                 // expect three failed lookup location - attempt to load module as file with all supported extensions
-                assert.equal(resolution.failedLookupLocations.length, supportedTSExtensions.length);
+                assert.equal(resolution.failedLookupLocations.length, supportedTSExtensions[0].length);
             }
         }
 
diff --git a/src/testRunner/unittests/programApi.ts b/src/testRunner/unittests/programApi.ts
index b71d13e54cd7e..359dff1c03434 100644
--- a/src/testRunner/unittests/programApi.ts
+++ b/src/testRunner/unittests/programApi.ts
@@ -11,7 +11,7 @@ namespace ts {
         assert.equal(notFound.length, 0, `Not found ${notFound} in actual: ${missingPaths} expected: ${expected}`);
     }
 
-    describe("unittests:: Program.getMissingFilePaths", () => {
+    describe("unittests:: programApi:: Program.getMissingFilePaths", () => {
 
         const options: CompilerOptions = {
             noLib: true,
diff --git a/src/testRunner/unittests/tsbuild/moduleResolution.ts b/src/testRunner/unittests/tsbuild/moduleResolution.ts
index 487f83196c36e..29c14a8552019 100644
--- a/src/testRunner/unittests/tsbuild/moduleResolution.ts
+++ b/src/testRunner/unittests/tsbuild/moduleResolution.ts
@@ -66,6 +66,96 @@ namespace ts.tscWatch {
             changes: emptyArray
         });
 
+        verifyTscWatch({
+            scenario: "moduleResolution",
+            subScenario: `resolves specifier in output declaration file from referenced project correctly with cts and mts extensions`,
+            sys: () => createWatchedSystem([
+                {
+                    path: `${projectRoot}/packages/pkg1/package.json`,
+                    content: JSON.stringify({
+                        name: "pkg1",
+                        version: "1.0.0",
+                        main: "build/index.js",
+                        type: "module"
+                    })
+                },
+                {
+                    path: `${projectRoot}/packages/pkg1/index.ts`,
+                    content: Utils.dedent`
+                    import type { TheNum } from 'pkg2'
+                    export const theNum: TheNum = 42;`
+                },
+                {
+                    path: `${projectRoot}/packages/pkg1/tsconfig.json`,
+                    content: JSON.stringify({
+                        compilerOptions: {
+                            outDir: "build",
+                            module: "node12",
+                        },
+                        references: [{ path: "../pkg2" }]
+                    })
+                },
+                {
+                    path: `${projectRoot}/packages/pkg2/const.cts`,
+                    content: `export type TheNum = 42;`
+                },
+                {
+                    path: `${projectRoot}/packages/pkg2/index.ts`,
+                    content: `export type { TheNum } from './const.cjs';`
+                },
+                {
+                    path: `${projectRoot}/packages/pkg2/tsconfig.json`,
+                    content: JSON.stringify({
+                        compilerOptions: {
+                            composite: true,
+                            outDir: "build",
+                            module: "node12",
+                        }
+                    })
+                },
+                {
+                    path: `${projectRoot}/packages/pkg2/package.json`,
+                    content: JSON.stringify({
+                        name: "pkg2",
+                        version: "1.0.0",
+                        main: "build/index.js",
+                        type: "module"
+                    })
+                },
+                {
+                    path: `${projectRoot}/node_modules/pkg2`,
+                    symLink: `${projectRoot}/packages/pkg2`,
+                },
+                { ...libFile, path: `/a/lib/lib.es2020.full.d.ts` }
+            ], { currentDirectory: projectRoot }),
+            commandLineArgs: ["-b", "packages/pkg1", "-w", "--verbose", "--traceResolution"],
+            changes: [
+                {
+                    caption: "reports import errors after change to package file",
+                    change: sys => replaceFileText(sys, `${projectRoot}/packages/pkg1/package.json`, `"module"`, `"commonjs"`),
+                    timeouts: runQueuedTimeoutCallbacks,
+                },
+                {
+                    caption: "removes those errors when a package file is changed back",
+                    change: sys => replaceFileText(sys, `${projectRoot}/packages/pkg1/package.json`, `"commonjs"`, `"module"`),
+                    timeouts: runQueuedTimeoutCallbacks,
+                },
+                {
+                    caption: "reports import errors after change to package file",
+                    change: sys => replaceFileText(sys, `${projectRoot}/packages/pkg1/package.json`, `"module"`, `"commonjs"`),
+                    timeouts: runQueuedTimeoutCallbacks,
+                },
+                {
+                    caption: "removes those errors when a package file is changed to cjs extensions",
+                    change: sys => {
+                        replaceFileText(sys, `${projectRoot}/packages/pkg2/package.json`, `"main": "build/index.js"`, `"main": "build/index.cjs"`);
+                        sys.renameFile(`${projectRoot}/packages/pkg2/index.ts`, `${projectRoot}/packages/pkg2/index.cts`)
+                    },
+                    timeouts: runQueuedTimeoutCallbacks,
+                },
+            ]
+        });
+
         verifyTsc({
             scenario: "moduleResolution",
             subScenario: `type reference resolution uses correct options for different resolution options referenced project`,
diff --git a/tests/baselines/reference/declarationEmitInvalidReferenceAllowJs.errors.txt b/tests/baselines/reference/declarationEmitInvalidReferenceAllowJs.errors.txt
index 79f9afa5f34cb..c035c443cf289 100644
--- a/tests/baselines/reference/declarationEmitInvalidReferenceAllowJs.errors.txt
+++ b/tests/baselines/reference/declarationEmitInvalidReferenceAllowJs.errors.txt
@@ -1,9 +1,9 @@
-tests/cases/compiler/declarationEmitInvalidReferenceAllowJs.ts(1,22): error TS6231: Could not resolve the path 'tests/cases/compiler/invalid' with the extensions: '.ts', '.tsx', '.d.ts', '.js', '.jsx'.
+tests/cases/compiler/declarationEmitInvalidReferenceAllowJs.ts(1,22): error TS6231: Could not resolve the path 'tests/cases/compiler/invalid' with the extensions: '.ts', '.tsx', '.d.ts', '.js', '.jsx', '.cts', '.d.cts', '.cjs', '.mts', '.d.mts', '.mjs'.
 
 
 ==== tests/cases/compiler/declarationEmitInvalidReferenceAllowJs.ts (1 errors) ====
     /// <reference path="invalid" />
                          ~~~~~~~
-!!! error TS6231: Could not resolve the path 'tests/cases/compiler/invalid' with the extensions: '.ts', '.tsx', '.d.ts', '.js', '.jsx'.
+!!! error TS6231: Could not resolve the path 'tests/cases/compiler/invalid' with the extensions: '.ts', '.tsx', '.d.ts', '.js', '.jsx', '.cts', '.d.cts', '.cjs', '.mts', '.d.mts', '.mjs'.
     var x = 0; 
     
\ No newline at end of file
diff --git a/tests/baselines/reference/jsFileCompilationWithMapFileAsJs.errors.txt b/tests/baselines/reference/jsFileCompilationWithMapFileAsJs.errors.txt
index 1f078b80a0002..2520eedbc7f64 100644
--- a/tests/baselines/reference/jsFileCompilationWithMapFileAsJs.errors.txt
+++ b/tests/baselines/reference/jsFileCompilationWithMapFileAsJs.errors.txt
@@ -1,13 +1,13 @@
 error TS5055: Cannot write file 'tests/cases/compiler/b.js' because it would overwrite input file.
   Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig.
-error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.js', '.jsx'.
+error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.js', '.jsx', '.cts', '.d.cts', '.cjs', '.mts', '.d.mts', '.mjs'.
   The file is in the program because:
     Root file specified for compilation
 
 
 !!! error TS5055: Cannot write file 'tests/cases/compiler/b.js' because it would overwrite input file.
 !!! error TS5055:   Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig.
-!!! error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.js', '.jsx'.
+!!! error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.js', '.jsx', '.cts', '.d.cts', '.cjs', '.mts', '.d.mts', '.mjs'.
 !!! error TS6054:   The file is in the program because:
 !!! error TS6054:     Root file specified for compilation
 ==== tests/cases/compiler/a.ts (0 errors) ====
diff --git a/tests/baselines/reference/jsFileCompilationWithMapFileAsJsWithInlineSourceMap.errors.txt b/tests/baselines/reference/jsFileCompilationWithMapFileAsJsWithInlineSourceMap.errors.txt
index 1f078b80a0002..2520eedbc7f64 100644
--- a/tests/baselines/reference/jsFileCompilationWithMapFileAsJsWithInlineSourceMap.errors.txt
+++ b/tests/baselines/reference/jsFileCompilationWithMapFileAsJsWithInlineSourceMap.errors.txt
@@ -1,13 +1,13 @@
 error TS5055: Cannot write file 'tests/cases/compiler/b.js' because it would overwrite input file.
   Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig.
-error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.js', '.jsx'.
+error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.js', '.jsx', '.cts', '.d.cts', '.cjs', '.mts', '.d.mts', '.mjs'.
   The file is in the program because:
     Root file specified for compilation
 
 
 !!! error TS5055: Cannot write file 'tests/cases/compiler/b.js' because it would overwrite input file.
 !!! error TS5055:   Adding a tsconfig.json file will help organize projects that contain both TypeScript and JavaScript files. Learn more at https://aka.ms/tsconfig.
-!!! error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.js', '.jsx'.
+!!! error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.js', '.jsx', '.cts', '.d.cts', '.cjs', '.mts', '.d.mts', '.mjs'.
 !!! error TS6054:   The file is in the program because:
 !!! error TS6054:     Root file specified for compilation
 ==== tests/cases/compiler/a.ts (0 errors) ====
diff --git a/tests/baselines/reference/jsFileCompilationWithMapFileAsJsWithOutDir.errors.txt b/tests/baselines/reference/jsFileCompilationWithMapFileAsJsWithOutDir.errors.txt
index 5b421bbfc8642..321ab08822506 100644
--- a/tests/baselines/reference/jsFileCompilationWithMapFileAsJsWithOutDir.errors.txt
+++ b/tests/baselines/reference/jsFileCompilationWithMapFileAsJsWithOutDir.errors.txt
@@ -1,4 +1,4 @@
-error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts'.
+error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
   The file is in the program because:
     Root file specified for compilation
 error TS6504: File 'tests/cases/compiler/b.js' is a JavaScript file. Did you mean to enable the 'allowJs' option?
@@ -6,7 +6,7 @@ error TS6504: File 'tests/cases/compiler/b.js' is a JavaScript file. Did you mea
     Root file specified for compilation
 
 
-!!! error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts'.
+!!! error TS6054: File 'tests/cases/compiler/b.js.map' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
 !!! error TS6054:   The file is in the program because:
 !!! error TS6054:     Root file specified for compilation
 !!! error TS6504: File 'tests/cases/compiler/b.js' is a JavaScript file. Did you mean to enable the 'allowJs' option?
diff --git a/tests/baselines/reference/nodeModules1(module=node12).errors.txt b/tests/baselines/reference/nodeModules1(module=node12).errors.txt
new file mode 100644
index 0000000000000..8ee0d921d50d2
--- /dev/null
+++ b/tests/baselines/reference/nodeModules1(module=node12).errors.txt
@@ -0,0 +1,158 @@
+tests/cases/conformance/node/index.cts(2,21): error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(3,21): error TS1435: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(6,21): error TS1435: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(9,21): error TS1435: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(11,22): error TS1435: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(12,22): error TS1435: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder/index.cts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder/index.mts (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.ts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.cts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.mts (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.ts (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.mts (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.cts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/index.mts (0 errors) ====
+    import * as m1 from "./index.js";
+    import * as m2 from "./index.mjs";
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+    import * as m11 from "./subfolder2/another/index.mjs";
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/index.cts (6 errors) ====
+    // ESM-format imports below should issue errors
+    import * as m1 from "./index.js";
+                        ~~~~~~~~~~~~
+!!! error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m2 from "./index.mjs";
+                        ~~~~~~~~~~~~~
+!!! error TS1435: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+                        ~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+                        ~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m11 from "./subfolder2/another/index.mjs";
+                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    import * as m1 from "./index.js";
+    import * as m2 from "./index.mjs";
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+    import * as m11 from "./subfolder2/another/index.mjs";
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/subfolder2/package.json (0 errors) ====
+    {
+    }
+==== tests/cases/conformance/node/subfolder2/another/package.json (0 errors) ====
+    {
+        "type": "module"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModules1(module=node12).js b/tests/baselines/reference/nodeModules1(module=node12).js
index 1acae5c9aab3b..fba5f41f193e3 100644
--- a/tests/baselines/reference/nodeModules1(module=node12).js
+++ b/tests/baselines/reference/nodeModules1(module=node12).js
@@ -4,15 +4,120 @@
 // cjs format file
 const x = 1;
 export {x};
+//// [index.cts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mts]
+// esm format file
+const x = 1;
+export {x};
 //// [index.ts]
 // cjs format file
 const x = 1;
 export {x};
+//// [index.cts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mts]
+// esm format file
+const x = 1;
+export {x};
 //// [index.ts]
 // esm format file
 const x = 1;
 export {x};
+//// [index.mts]
+// esm format file
+const x = 1;
+export {x};
+//// [index.cts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mts]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export {x};
+//// [index.cts]
+// ESM-format imports below should issue errors
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+export {x};
 //// [index.ts]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export {x};
@@ -41,6 +146,17 @@ exports.x = void 0;
 // cjs format file
 const x = 1;
 exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
@@ -48,25 +164,174 @@ exports.x = void 0;
 // cjs format file
 const x = 1;
 exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
 // esm format file
 const x = 1;
 export { x };
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
 //// [index.js]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export { x };
+//// [index.mjs]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export { x };
+//// [index.cjs]
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// ESM-format imports below should issue errors
+const m1 = __importStar(require("./index.js"));
+const m2 = __importStar(require("./index.mjs"));
+const m3 = __importStar(require("./index.cjs"));
+const m4 = __importStar(require("./subfolder/index.js"));
+const m5 = __importStar(require("./subfolder/index.mjs"));
+const m6 = __importStar(require("./subfolder/index.cjs"));
+const m7 = __importStar(require("./subfolder2/index.js"));
+const m8 = __importStar(require("./subfolder2/index.mjs"));
+const m9 = __importStar(require("./subfolder2/index.cjs"));
+const m10 = __importStar(require("./subfolder2/another/index.js"));
+const m11 = __importStar(require("./subfolder2/another/index.mjs"));
+const m12 = __importStar(require("./subfolder2/another/index.cjs"));
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+exports.x = x;
 
 
 //// [index.d.ts]
 declare const x = 1;
 export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 declare const x = 1;
 export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 declare const x = 1;
 export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 declare const x = 1;
 export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
diff --git a/tests/baselines/reference/nodeModules1(module=node12).symbols b/tests/baselines/reference/nodeModules1(module=node12).symbols
index e1653429c87db..b8caa52c8cfa0 100644
--- a/tests/baselines/reference/nodeModules1(module=node12).symbols
+++ b/tests/baselines/reference/nodeModules1(module=node12).symbols
@@ -6,6 +6,22 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.ts, 2, 8))
 
+=== tests/cases/conformance/node/subfolder/index.cts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder/index.mts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
 === tests/cases/conformance/node/subfolder2/index.ts ===
 // cjs format file
 const x = 1;
@@ -14,6 +30,22 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.ts, 2, 8))
 
+=== tests/cases/conformance/node/subfolder2/index.cts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.mts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
 === tests/cases/conformance/node/subfolder2/another/index.ts ===
 // esm format file
 const x = 1;
@@ -22,11 +54,260 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.ts, 2, 8))
 
+=== tests/cases/conformance/node/subfolder2/another/index.mts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.cts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/index.mts ===
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.mts, 0, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.mts, 1, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.mts, 2, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.mts, 3, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.mts, 4, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.mts, 5, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.mts, 6, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.mts, 7, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.mts, 8, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.mts, 9, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.mts, 10, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.mts, 11, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.mts, 0, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.mts, 1, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.mts, 2, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.mts, 3, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.mts, 4, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.mts, 5, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.mts, 6, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.mts, 7, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.mts, 8, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.mts, 9, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.mts, 10, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.mts, 11, 6))
+
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mts, 25, 5))
+
+export {x};
+>x : Symbol(m2.x, Decl(index.mts, 26, 8))
+
+=== tests/cases/conformance/node/index.cts ===
+// ESM-format imports below should issue errors
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.cts, 1, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.cts, 2, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.cts, 3, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.cts, 4, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.cts, 5, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.cts, 6, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.cts, 7, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.cts, 8, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.cts, 9, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.cts, 10, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.cts, 11, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.cts, 12, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.cts, 1, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.cts, 2, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.cts, 3, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.cts, 4, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.cts, 5, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.cts, 6, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.cts, 7, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.cts, 8, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.cts, 9, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.cts, 10, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.cts, 11, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.cts, 12, 6))
+
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cts, 26, 5))
+
+export {x};
+>x : Symbol(m3.x, Decl(index.cts, 27, 8))
+
 === tests/cases/conformance/node/index.ts ===
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.ts, 0, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.ts, 1, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.ts, 2, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.ts, 3, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.ts, 4, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.ts, 5, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.ts, 6, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.ts, 7, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.ts, 8, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.ts, 9, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.ts, 10, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.ts, 11, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.ts, 0, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.ts, 1, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.ts, 2, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.ts, 3, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.ts, 4, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.ts, 5, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.ts, 6, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.ts, 7, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.ts, 8, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.ts, 9, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.ts, 10, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.ts, 11, 6))
+
 // esm format file
 const x = 1;
->x : Symbol(x, Decl(index.ts, 1, 5))
+>x : Symbol(x, Decl(index.ts, 25, 5))
 
 export {x};
->x : Symbol(x, Decl(index.ts, 2, 8))
+>x : Symbol(m1.x, Decl(index.ts, 26, 8))
 
diff --git a/tests/baselines/reference/nodeModules1(module=node12).types b/tests/baselines/reference/nodeModules1(module=node12).types
index 1c479a5e7bd48..cf878a592d2e9 100644
--- a/tests/baselines/reference/nodeModules1(module=node12).types
+++ b/tests/baselines/reference/nodeModules1(module=node12).types
@@ -7,6 +7,24 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/subfolder/index.cts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder/index.mts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/subfolder2/index.ts ===
 // cjs format file
 const x = 1;
@@ -16,6 +34,24 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/subfolder2/index.cts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder2/index.mts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/subfolder2/another/index.ts ===
 // esm format file
 const x = 1;
@@ -25,7 +61,296 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/subfolder2/another/index.mts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder2/another/index.cts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/index.mts ===
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/index.cts ===
+// ESM-format imports below should issue errors
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/index.ts ===
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
 // esm format file
 const x = 1;
 >x : 1
diff --git a/tests/baselines/reference/nodeModules1(module=nodenext).errors.txt b/tests/baselines/reference/nodeModules1(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..8ee0d921d50d2
--- /dev/null
+++ b/tests/baselines/reference/nodeModules1(module=nodenext).errors.txt
@@ -0,0 +1,158 @@
+tests/cases/conformance/node/index.cts(2,21): error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(3,21): error TS1435: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(6,21): error TS1435: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(9,21): error TS1435: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(11,22): error TS1435: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(12,22): error TS1435: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder/index.cts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder/index.mts (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.ts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.cts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.mts (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.ts (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.mts (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.cts (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/index.mts (0 errors) ====
+    import * as m1 from "./index.js";
+    import * as m2 from "./index.mjs";
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+    import * as m11 from "./subfolder2/another/index.mjs";
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/index.cts (6 errors) ====
+    // ESM-format imports below should issue errors
+    import * as m1 from "./index.js";
+                        ~~~~~~~~~~~~
+!!! error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m2 from "./index.mjs";
+                        ~~~~~~~~~~~~~
+!!! error TS1435: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+                        ~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+                        ~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m11 from "./subfolder2/another/index.mjs";
+                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    import * as m1 from "./index.js";
+    import * as m2 from "./index.mjs";
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+    import * as m11 from "./subfolder2/another/index.mjs";
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/subfolder2/package.json (0 errors) ====
+    {
+    }
+==== tests/cases/conformance/node/subfolder2/another/package.json (0 errors) ====
+    {
+        "type": "module"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModules1(module=nodenext).js b/tests/baselines/reference/nodeModules1(module=nodenext).js
index 1acae5c9aab3b..fba5f41f193e3 100644
--- a/tests/baselines/reference/nodeModules1(module=nodenext).js
+++ b/tests/baselines/reference/nodeModules1(module=nodenext).js
@@ -4,15 +4,120 @@
 // cjs format file
 const x = 1;
 export {x};
+//// [index.cts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mts]
+// esm format file
+const x = 1;
+export {x};
 //// [index.ts]
 // cjs format file
 const x = 1;
 export {x};
+//// [index.cts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mts]
+// esm format file
+const x = 1;
+export {x};
 //// [index.ts]
 // esm format file
 const x = 1;
 export {x};
+//// [index.mts]
+// esm format file
+const x = 1;
+export {x};
+//// [index.cts]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mts]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export {x};
+//// [index.cts]
+// ESM-format imports below should issue errors
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+export {x};
 //// [index.ts]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export {x};
@@ -41,6 +146,17 @@ exports.x = void 0;
 // cjs format file
 const x = 1;
 exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
@@ -48,25 +164,174 @@ exports.x = void 0;
 // cjs format file
 const x = 1;
 exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
 // esm format file
 const x = 1;
 export { x };
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
 //// [index.js]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export { x };
+//// [index.mjs]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export { x };
+//// [index.cjs]
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// ESM-format imports below should issue errors
+const m1 = __importStar(require("./index.js"));
+const m2 = __importStar(require("./index.mjs"));
+const m3 = __importStar(require("./index.cjs"));
+const m4 = __importStar(require("./subfolder/index.js"));
+const m5 = __importStar(require("./subfolder/index.mjs"));
+const m6 = __importStar(require("./subfolder/index.cjs"));
+const m7 = __importStar(require("./subfolder2/index.js"));
+const m8 = __importStar(require("./subfolder2/index.mjs"));
+const m9 = __importStar(require("./subfolder2/index.cjs"));
+const m10 = __importStar(require("./subfolder2/another/index.js"));
+const m11 = __importStar(require("./subfolder2/another/index.mjs"));
+const m12 = __importStar(require("./subfolder2/another/index.cjs"));
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+exports.x = x;
 
 
 //// [index.d.ts]
 declare const x = 1;
 export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 declare const x = 1;
 export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 declare const x = 1;
 export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 declare const x = 1;
 export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
diff --git a/tests/baselines/reference/nodeModules1(module=nodenext).symbols b/tests/baselines/reference/nodeModules1(module=nodenext).symbols
index e1653429c87db..b8caa52c8cfa0 100644
--- a/tests/baselines/reference/nodeModules1(module=nodenext).symbols
+++ b/tests/baselines/reference/nodeModules1(module=nodenext).symbols
@@ -6,6 +6,22 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.ts, 2, 8))
 
+=== tests/cases/conformance/node/subfolder/index.cts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder/index.mts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
 === tests/cases/conformance/node/subfolder2/index.ts ===
 // cjs format file
 const x = 1;
@@ -14,6 +30,22 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.ts, 2, 8))
 
+=== tests/cases/conformance/node/subfolder2/index.cts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.mts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
 === tests/cases/conformance/node/subfolder2/another/index.ts ===
 // esm format file
 const x = 1;
@@ -22,11 +54,260 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.ts, 2, 8))
 
+=== tests/cases/conformance/node/subfolder2/another/index.mts ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.cts ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cts, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/index.mts ===
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.mts, 0, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.mts, 1, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.mts, 2, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.mts, 3, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.mts, 4, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.mts, 5, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.mts, 6, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.mts, 7, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.mts, 8, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.mts, 9, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.mts, 10, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.mts, 11, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.mts, 0, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.mts, 1, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.mts, 2, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.mts, 3, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.mts, 4, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.mts, 5, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.mts, 6, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.mts, 7, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.mts, 8, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.mts, 9, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.mts, 10, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.mts, 11, 6))
+
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mts, 25, 5))
+
+export {x};
+>x : Symbol(m2.x, Decl(index.mts, 26, 8))
+
+=== tests/cases/conformance/node/index.cts ===
+// ESM-format imports below should issue errors
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.cts, 1, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.cts, 2, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.cts, 3, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.cts, 4, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.cts, 5, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.cts, 6, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.cts, 7, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.cts, 8, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.cts, 9, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.cts, 10, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.cts, 11, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.cts, 12, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.cts, 1, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.cts, 2, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.cts, 3, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.cts, 4, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.cts, 5, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.cts, 6, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.cts, 7, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.cts, 8, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.cts, 9, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.cts, 10, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.cts, 11, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.cts, 12, 6))
+
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cts, 26, 5))
+
+export {x};
+>x : Symbol(m3.x, Decl(index.cts, 27, 8))
+
 === tests/cases/conformance/node/index.ts ===
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.ts, 0, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.ts, 1, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.ts, 2, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.ts, 3, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.ts, 4, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.ts, 5, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.ts, 6, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.ts, 7, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.ts, 8, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.ts, 9, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.ts, 10, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.ts, 11, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.ts, 0, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.ts, 1, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.ts, 2, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.ts, 3, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.ts, 4, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.ts, 5, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.ts, 6, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.ts, 7, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.ts, 8, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.ts, 9, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.ts, 10, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.ts, 11, 6))
+
 // esm format file
 const x = 1;
->x : Symbol(x, Decl(index.ts, 1, 5))
+>x : Symbol(x, Decl(index.ts, 25, 5))
 
 export {x};
->x : Symbol(x, Decl(index.ts, 2, 8))
+>x : Symbol(m1.x, Decl(index.ts, 26, 8))
 
diff --git a/tests/baselines/reference/nodeModules1(module=nodenext).types b/tests/baselines/reference/nodeModules1(module=nodenext).types
index 1c479a5e7bd48..cf878a592d2e9 100644
--- a/tests/baselines/reference/nodeModules1(module=nodenext).types
+++ b/tests/baselines/reference/nodeModules1(module=nodenext).types
@@ -7,6 +7,24 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/subfolder/index.cts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder/index.mts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/subfolder2/index.ts ===
 // cjs format file
 const x = 1;
@@ -16,6 +34,24 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/subfolder2/index.cts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder2/index.mts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/subfolder2/another/index.ts ===
 // esm format file
 const x = 1;
@@ -25,7 +61,296 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/subfolder2/another/index.mts ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/subfolder2/another/index.cts ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/index.mts ===
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/index.cts ===
+// ESM-format imports below should issue errors
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/index.ts ===
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
 // esm format file
 const x = 1;
 >x : 1
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).errors.txt
new file mode 100644
index 0000000000000..d2d1c33f60189
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).errors.txt
@@ -0,0 +1,158 @@
+tests/cases/conformance/node/allowJs/index.cjs(2,21): error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(3,21): error TS1435: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(6,21): error TS1435: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(9,21): error TS1435: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(11,22): error TS1435: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(12,22): error TS1435: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder/index.cjs (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder/index.mjs (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/index.js (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/index.cjs (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/index.mjs (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/another/index.js (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/another/index.cjs (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/another/index.mjs (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    import * as m1 from "./index.js";
+    import * as m2 from "./index.mjs";
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+    import * as m11 from "./subfolder2/another/index.mjs";
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/index.cjs (6 errors) ====
+    // ESM format imports below should error
+    import * as m1 from "./index.js";
+                        ~~~~~~~~~~~~
+!!! error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m2 from "./index.mjs";
+                        ~~~~~~~~~~~~~
+!!! error TS1435: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+                        ~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+                        ~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m11 from "./subfolder2/another/index.mjs";
+                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/index.mjs (0 errors) ====
+    import * as m1 from "./index.js";
+    import * as m2 from "./index.mjs";
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+    import * as m11 from "./subfolder2/another/index.mjs";
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder2/package.json (0 errors) ====
+    {
+    }
+==== tests/cases/conformance/node/allowJs/subfolder2/another/package.json (0 errors) ====
+    {
+        "type": "module"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).js b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).js
index 358104e5f6a62..0ec674cdd18b3 100644
--- a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).js
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).js
@@ -4,15 +4,120 @@
 // cjs format file
 const x = 1;
 export {x};
+//// [index.cjs]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mjs]
+// esm format file
+const x = 1;
+export {x};
 //// [index.js]
 // cjs format file
 const x = 1;
 export {x};
+//// [index.cjs]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mjs]
+// esm format file
+const x = 1;
+export {x};
 //// [index.js]
 // esm format file
 const x = 1;
 export {x};
+//// [index.cjs]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mjs]
+// esm format file
+const x = 1;
+export {x};
 //// [index.js]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export {x};
+//// [index.cjs]
+// ESM format imports below should error
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mjs]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export {x};
@@ -41,6 +146,17 @@ exports.x = void 0;
 // cjs format file
 const x = 1;
 exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
@@ -48,11 +164,136 @@ exports.x = void 0;
 // cjs format file
 const x = 1;
 exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
 // esm format file
 const x = 1;
 export { x };
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
+//// [index.cjs]
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// ESM format imports below should error
+const m1 = __importStar(require("./index.js"));
+const m2 = __importStar(require("./index.mjs"));
+const m3 = __importStar(require("./index.cjs"));
+const m4 = __importStar(require("./subfolder/index.js"));
+const m5 = __importStar(require("./subfolder/index.mjs"));
+const m6 = __importStar(require("./subfolder/index.cjs"));
+const m7 = __importStar(require("./subfolder2/index.js"));
+const m8 = __importStar(require("./subfolder2/index.mjs"));
+const m9 = __importStar(require("./subfolder2/index.cjs"));
+const m10 = __importStar(require("./subfolder2/another/index.js"));
+const m11 = __importStar(require("./subfolder2/another/index.mjs"));
+const m12 = __importStar(require("./subfolder2/another/index.cjs"));
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export { x };
@@ -60,9 +301,33 @@ export { x };
 
 //// [index.d.ts]
 export const x: 1;
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 export const x: 1;
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 export const x: 1;
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 export const x: 1;
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).symbols b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).symbols
index 99bfb2a40ff73..90c86e3a1be64 100644
--- a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).symbols
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).symbols
@@ -6,6 +6,22 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.js, 2, 8))
 
+=== tests/cases/conformance/node/allowJs/subfolder/index.cjs ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cjs, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder/index.mjs ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mjs, 2, 8))
+
 === tests/cases/conformance/node/allowJs/subfolder2/index.js ===
 // cjs format file
 const x = 1;
@@ -14,6 +30,22 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.js, 2, 8))
 
+=== tests/cases/conformance/node/allowJs/subfolder2/index.cjs ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cjs, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder2/index.mjs ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mjs, 2, 8))
+
 === tests/cases/conformance/node/allowJs/subfolder2/another/index.js ===
 // esm format file
 const x = 1;
@@ -22,11 +54,260 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.js, 2, 8))
 
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.cjs ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cjs, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.mjs ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mjs, 2, 8))
+
 === tests/cases/conformance/node/allowJs/index.js ===
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.js, 0, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.js, 1, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.js, 2, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.js, 3, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.js, 4, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.js, 5, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.js, 6, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.js, 7, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.js, 8, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.js, 9, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.js, 10, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.js, 11, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.js, 0, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.js, 1, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.js, 2, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.js, 3, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.js, 4, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.js, 5, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.js, 6, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.js, 7, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.js, 8, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.js, 9, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.js, 10, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.js, 11, 6))
+
 // esm format file
 const x = 1;
->x : Symbol(x, Decl(index.js, 1, 5))
+>x : Symbol(x, Decl(index.js, 25, 5))
 
 export {x};
->x : Symbol(x, Decl(index.js, 2, 8))
+>x : Symbol(m1.x, Decl(index.js, 26, 8))
+
+=== tests/cases/conformance/node/allowJs/index.cjs ===
+// ESM format imports below should error
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.cjs, 1, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.cjs, 2, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.cjs, 3, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.cjs, 4, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.cjs, 5, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.cjs, 6, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.cjs, 7, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.cjs, 8, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.cjs, 9, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.cjs, 10, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.cjs, 11, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.cjs, 12, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.cjs, 1, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.cjs, 2, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.cjs, 3, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.cjs, 4, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.cjs, 5, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.cjs, 6, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.cjs, 7, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.cjs, 8, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.cjs, 9, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.cjs, 10, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.cjs, 11, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.cjs, 12, 6))
+
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cjs, 26, 5))
+
+export {x};
+>x : Symbol(m3.x, Decl(index.cjs, 27, 8))
+
+=== tests/cases/conformance/node/allowJs/index.mjs ===
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.mjs, 0, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.mjs, 1, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.mjs, 2, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.mjs, 3, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.mjs, 4, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.mjs, 5, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.mjs, 6, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.mjs, 7, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.mjs, 8, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.mjs, 9, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.mjs, 10, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.mjs, 11, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.mjs, 0, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.mjs, 1, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.mjs, 2, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.mjs, 3, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.mjs, 4, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.mjs, 5, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.mjs, 6, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.mjs, 7, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.mjs, 8, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.mjs, 9, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.mjs, 10, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.mjs, 11, 6))
+
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mjs, 25, 5))
+
+export {x};
+>x : Symbol(m2.x, Decl(index.mjs, 26, 8))
 
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).types b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).types
index bb0713313ec99..d0acce4132567 100644
--- a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).types
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).types
@@ -7,6 +7,24 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/allowJs/subfolder/index.cjs ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder/index.mjs ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/allowJs/subfolder2/index.js ===
 // cjs format file
 const x = 1;
@@ -16,6 +34,24 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/allowJs/subfolder2/index.cjs ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder2/index.mjs ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/allowJs/subfolder2/another/index.js ===
 // esm format file
 const x = 1;
@@ -25,7 +61,296 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.cjs ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.mjs ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/allowJs/index.js ===
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/index.cjs ===
+// ESM format imports below should error
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/index.mjs ===
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
 // esm format file
 const x = 1;
 >x : 1
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..d2d1c33f60189
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).errors.txt
@@ -0,0 +1,158 @@
+tests/cases/conformance/node/allowJs/index.cjs(2,21): error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(3,21): error TS1435: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(6,21): error TS1435: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(9,21): error TS1435: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(11,22): error TS1435: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(12,22): error TS1435: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+
+
+==== tests/cases/conformance/node/allowJs/subfolder/index.js (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder/index.cjs (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder/index.mjs (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/index.js (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/index.cjs (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/index.mjs (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/another/index.js (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/another/index.cjs (0 errors) ====
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/subfolder2/another/index.mjs (0 errors) ====
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/index.js (0 errors) ====
+    import * as m1 from "./index.js";
+    import * as m2 from "./index.mjs";
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+    import * as m11 from "./subfolder2/another/index.mjs";
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/index.cjs (6 errors) ====
+    // ESM format imports below should error
+    import * as m1 from "./index.js";
+                        ~~~~~~~~~~~~
+!!! error TS1435: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m2 from "./index.mjs";
+                        ~~~~~~~~~~~~~
+!!! error TS1435: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+                        ~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+                        ~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m11 from "./subfolder2/another/index.mjs";
+                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS1435: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // cjs format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/index.mjs (0 errors) ====
+    import * as m1 from "./index.js";
+    import * as m2 from "./index.mjs";
+    import * as m3 from "./index.cjs";
+    import * as m4 from "./subfolder/index.js";
+    import * as m5 from "./subfolder/index.mjs";
+    import * as m6 from "./subfolder/index.cjs";
+    import * as m7 from "./subfolder2/index.js";
+    import * as m8 from "./subfolder2/index.mjs";
+    import * as m9 from "./subfolder2/index.cjs";
+    import * as m10 from "./subfolder2/another/index.js";
+    import * as m11 from "./subfolder2/another/index.mjs";
+    import * as m12 from "./subfolder2/another/index.cjs";
+    void m1;
+    void m2;
+    void m3;
+    void m4;
+    void m5;
+    void m6;
+    void m7;
+    void m8;
+    void m9;
+    void m10;
+    void m11;
+    void m12;
+    // esm format file
+    const x = 1;
+    export {x};
+==== tests/cases/conformance/node/allowJs/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/allowJs/subfolder2/package.json (0 errors) ====
+    {
+    }
+==== tests/cases/conformance/node/allowJs/subfolder2/another/package.json (0 errors) ====
+    {
+        "type": "module"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).js b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).js
index 358104e5f6a62..0ec674cdd18b3 100644
--- a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).js
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).js
@@ -4,15 +4,120 @@
 // cjs format file
 const x = 1;
 export {x};
+//// [index.cjs]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mjs]
+// esm format file
+const x = 1;
+export {x};
 //// [index.js]
 // cjs format file
 const x = 1;
 export {x};
+//// [index.cjs]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mjs]
+// esm format file
+const x = 1;
+export {x};
 //// [index.js]
 // esm format file
 const x = 1;
 export {x};
+//// [index.cjs]
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mjs]
+// esm format file
+const x = 1;
+export {x};
 //// [index.js]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export {x};
+//// [index.cjs]
+// ESM format imports below should error
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+export {x};
+//// [index.mjs]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export {x};
@@ -41,6 +146,17 @@ exports.x = void 0;
 // cjs format file
 const x = 1;
 exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
@@ -48,11 +164,136 @@ exports.x = void 0;
 // cjs format file
 const x = 1;
 exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
 // esm format file
 const x = 1;
 export { x };
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = 1;
+export { x };
+//// [index.cjs]
+"use strict";
+var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
+}) : (function(o, m, k, k2) {
+    if (k2 === undefined) k2 = k;
+    o[k2] = m[k];
+}));
+var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
+    Object.defineProperty(o, "default", { enumerable: true, value: v });
+}) : function(o, v) {
+    o["default"] = v;
+});
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
+    __setModuleDefault(result, mod);
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// ESM format imports below should error
+const m1 = __importStar(require("./index.js"));
+const m2 = __importStar(require("./index.mjs"));
+const m3 = __importStar(require("./index.cjs"));
+const m4 = __importStar(require("./subfolder/index.js"));
+const m5 = __importStar(require("./subfolder/index.mjs"));
+const m6 = __importStar(require("./subfolder/index.cjs"));
+const m7 = __importStar(require("./subfolder2/index.js"));
+const m8 = __importStar(require("./subfolder2/index.mjs"));
+const m9 = __importStar(require("./subfolder2/index.cjs"));
+const m10 = __importStar(require("./subfolder2/another/index.js"));
+const m11 = __importStar(require("./subfolder2/another/index.mjs"));
+const m12 = __importStar(require("./subfolder2/another/index.cjs"));
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+exports.x = x;
+//// [index.mjs]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export { x };
 //// [index.js]
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export { x };
@@ -60,9 +301,33 @@ export { x };
 
 //// [index.d.ts]
 export const x: 1;
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 export const x: 1;
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 export const x: 1;
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
+//// [index.d.cts]
+declare const x = 1;
+export { x };
+//// [index.d.mts]
+declare const x = 1;
+export { x };
 //// [index.d.ts]
 export const x: 1;
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).symbols b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).symbols
index 99bfb2a40ff73..90c86e3a1be64 100644
--- a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).symbols
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).symbols
@@ -6,6 +6,22 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.js, 2, 8))
 
+=== tests/cases/conformance/node/allowJs/subfolder/index.cjs ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cjs, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder/index.mjs ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mjs, 2, 8))
+
 === tests/cases/conformance/node/allowJs/subfolder2/index.js ===
 // cjs format file
 const x = 1;
@@ -14,6 +30,22 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.js, 2, 8))
 
+=== tests/cases/conformance/node/allowJs/subfolder2/index.cjs ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cjs, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder2/index.mjs ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mjs, 2, 8))
+
 === tests/cases/conformance/node/allowJs/subfolder2/another/index.js ===
 // esm format file
 const x = 1;
@@ -22,11 +54,260 @@ const x = 1;
 export {x};
 >x : Symbol(x, Decl(index.js, 2, 8))
 
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.cjs ===
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.cjs, 2, 8))
+
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.mjs ===
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mjs, 1, 5))
+
+export {x};
+>x : Symbol(x, Decl(index.mjs, 2, 8))
+
 === tests/cases/conformance/node/allowJs/index.js ===
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.js, 0, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.js, 1, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.js, 2, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.js, 3, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.js, 4, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.js, 5, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.js, 6, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.js, 7, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.js, 8, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.js, 9, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.js, 10, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.js, 11, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.js, 0, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.js, 1, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.js, 2, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.js, 3, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.js, 4, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.js, 5, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.js, 6, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.js, 7, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.js, 8, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.js, 9, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.js, 10, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.js, 11, 6))
+
 // esm format file
 const x = 1;
->x : Symbol(x, Decl(index.js, 1, 5))
+>x : Symbol(x, Decl(index.js, 25, 5))
 
 export {x};
->x : Symbol(x, Decl(index.js, 2, 8))
+>x : Symbol(m1.x, Decl(index.js, 26, 8))
+
+=== tests/cases/conformance/node/allowJs/index.cjs ===
+// ESM format imports below should error
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.cjs, 1, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.cjs, 2, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.cjs, 3, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.cjs, 4, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.cjs, 5, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.cjs, 6, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.cjs, 7, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.cjs, 8, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.cjs, 9, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.cjs, 10, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.cjs, 11, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.cjs, 12, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.cjs, 1, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.cjs, 2, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.cjs, 3, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.cjs, 4, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.cjs, 5, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.cjs, 6, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.cjs, 7, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.cjs, 8, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.cjs, 9, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.cjs, 10, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.cjs, 11, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.cjs, 12, 6))
+
+// cjs format file
+const x = 1;
+>x : Symbol(x, Decl(index.cjs, 26, 5))
+
+export {x};
+>x : Symbol(m3.x, Decl(index.cjs, 27, 8))
+
+=== tests/cases/conformance/node/allowJs/index.mjs ===
+import * as m1 from "./index.js";
+>m1 : Symbol(m1, Decl(index.mjs, 0, 6))
+
+import * as m2 from "./index.mjs";
+>m2 : Symbol(m2, Decl(index.mjs, 1, 6))
+
+import * as m3 from "./index.cjs";
+>m3 : Symbol(m3, Decl(index.mjs, 2, 6))
+
+import * as m4 from "./subfolder/index.js";
+>m4 : Symbol(m4, Decl(index.mjs, 3, 6))
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : Symbol(m5, Decl(index.mjs, 4, 6))
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : Symbol(m6, Decl(index.mjs, 5, 6))
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : Symbol(m7, Decl(index.mjs, 6, 6))
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : Symbol(m8, Decl(index.mjs, 7, 6))
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : Symbol(m9, Decl(index.mjs, 8, 6))
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : Symbol(m10, Decl(index.mjs, 9, 6))
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : Symbol(m11, Decl(index.mjs, 10, 6))
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : Symbol(m12, Decl(index.mjs, 11, 6))
+
+void m1;
+>m1 : Symbol(m1, Decl(index.mjs, 0, 6))
+
+void m2;
+>m2 : Symbol(m2, Decl(index.mjs, 1, 6))
+
+void m3;
+>m3 : Symbol(m3, Decl(index.mjs, 2, 6))
+
+void m4;
+>m4 : Symbol(m4, Decl(index.mjs, 3, 6))
+
+void m5;
+>m5 : Symbol(m5, Decl(index.mjs, 4, 6))
+
+void m6;
+>m6 : Symbol(m6, Decl(index.mjs, 5, 6))
+
+void m7;
+>m7 : Symbol(m7, Decl(index.mjs, 6, 6))
+
+void m8;
+>m8 : Symbol(m8, Decl(index.mjs, 7, 6))
+
+void m9;
+>m9 : Symbol(m9, Decl(index.mjs, 8, 6))
+
+void m10;
+>m10 : Symbol(m10, Decl(index.mjs, 9, 6))
+
+void m11;
+>m11 : Symbol(m11, Decl(index.mjs, 10, 6))
+
+void m12;
+>m12 : Symbol(m12, Decl(index.mjs, 11, 6))
+
+// esm format file
+const x = 1;
+>x : Symbol(x, Decl(index.mjs, 25, 5))
+
+export {x};
+>x : Symbol(m2.x, Decl(index.mjs, 26, 8))
 
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).types b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).types
index bb0713313ec99..d0acce4132567 100644
--- a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).types
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).types
@@ -7,6 +7,24 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/allowJs/subfolder/index.cjs ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder/index.mjs ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/allowJs/subfolder2/index.js ===
 // cjs format file
 const x = 1;
@@ -16,6 +34,24 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/allowJs/subfolder2/index.cjs ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder2/index.mjs ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/allowJs/subfolder2/another/index.js ===
 // esm format file
 const x = 1;
@@ -25,7 +61,296 @@ const x = 1;
 export {x};
 >x : 1
 
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.cjs ===
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/subfolder2/another/index.mjs ===
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
 === tests/cases/conformance/node/allowJs/index.js ===
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
+// esm format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/index.cjs ===
+// ESM format imports below should error
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
+// cjs format file
+const x = 1;
+>x : 1
+>1 : 1
+
+export {x};
+>x : 1
+
+=== tests/cases/conformance/node/allowJs/index.mjs ===
+import * as m1 from "./index.js";
+>m1 : typeof m1
+
+import * as m2 from "./index.mjs";
+>m2 : typeof m2
+
+import * as m3 from "./index.cjs";
+>m3 : typeof m3
+
+import * as m4 from "./subfolder/index.js";
+>m4 : typeof m4
+
+import * as m5 from "./subfolder/index.mjs";
+>m5 : typeof m5
+
+import * as m6 from "./subfolder/index.cjs";
+>m6 : typeof m6
+
+import * as m7 from "./subfolder2/index.js";
+>m7 : typeof m7
+
+import * as m8 from "./subfolder2/index.mjs";
+>m8 : typeof m8
+
+import * as m9 from "./subfolder2/index.cjs";
+>m9 : typeof m9
+
+import * as m10 from "./subfolder2/another/index.js";
+>m10 : typeof m10
+
+import * as m11 from "./subfolder2/another/index.mjs";
+>m11 : typeof m11
+
+import * as m12 from "./subfolder2/another/index.cjs";
+>m12 : typeof m12
+
+void m1;
+>void m1 : undefined
+>m1 : typeof m1
+
+void m2;
+>void m2 : undefined
+>m2 : typeof m2
+
+void m3;
+>void m3 : undefined
+>m3 : typeof m3
+
+void m4;
+>void m4 : undefined
+>m4 : typeof m4
+
+void m5;
+>void m5 : undefined
+>m5 : typeof m5
+
+void m6;
+>void m6 : undefined
+>m6 : typeof m6
+
+void m7;
+>void m7 : undefined
+>m7 : typeof m7
+
+void m8;
+>void m8 : undefined
+>m8 : typeof m8
+
+void m9;
+>void m9 : undefined
+>m9 : typeof m9
+
+void m10;
+>void m10 : undefined
+>m10 : typeof m10
+
+void m11;
+>void m11 : undefined
+>m11 : typeof m11
+
+void m12;
+>void m12 : undefined
+>m12 : typeof m12
+
 // esm format file
 const x = 1;
 >x : 1
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).errors.txt b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).errors.txt
new file mode 100644
index 0000000000000..233fb07a30e11
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).errors.txt
@@ -0,0 +1,139 @@
+tests/cases/conformance/node/index.cts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/index.cts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.cts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.mts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/index.mts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.mts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.cts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder/index.cts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.cts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.mts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder/index.mts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.mts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.cts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/index.cts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.cts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.mts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/index.mts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+    export {x};
+==== tests/cases/conformance/node/subfolder/index.cts (3 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder/index.mts (3 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.ts (0 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.cts (3 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.mts (3 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.ts (0 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.mts (3 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.cts (3 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/index.mts (3 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/index.cts (3 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+    export {x};
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/subfolder2/package.json (0 errors) ====
+    {
+    }
+==== tests/cases/conformance/node/subfolder2/another/package.json (0 errors) ====
+    {
+        "type": "module"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).js b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).js
new file mode 100644
index 0000000000000..4cca6af5a58d7
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).js
@@ -0,0 +1,172 @@
+//// [tests/cases/conformance/node/nodeModulesForbidenSyntax.ts] ////
+
+//// [index.ts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.cts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.mts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.ts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.cts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.mts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.ts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.mts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.cts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.mts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.cts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.ts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [package.json]
+{
+}
+//// [package.json]
+{
+    "type": "module"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.js]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.mjs]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = () => (void 0);
+export { x };
+
+
+//// [index.d.ts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.cts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.mts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.ts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.cts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.mts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.ts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.mts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.cts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.mts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.cts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.ts]
+declare const x: <T>() => T;
+export { x };
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).symbols b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).symbols
new file mode 100644
index 0000000000000..1ca35d0d3e32e
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).symbols
@@ -0,0 +1,120 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.cts, 1, 5))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.mts, 1, 5))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.ts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.cts, 1, 5))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.mts, 1, 5))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.ts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.mts, 1, 5))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.cts, 1, 5))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.mts, 1, 5))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.cts, 1, 5))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).types b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).types
new file mode 100644
index 0000000000000..016af4314d16b
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).types
@@ -0,0 +1,168 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/index.ts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/another/index.ts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/another/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/another/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).errors.txt
new file mode 100644
index 0000000000000..233fb07a30e11
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).errors.txt
@@ -0,0 +1,139 @@
+tests/cases/conformance/node/index.cts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/index.cts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.cts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.mts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/index.mts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.mts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.cts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder/index.cts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.cts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.mts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder/index.mts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.mts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.cts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/index.cts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.cts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.mts(2,12): error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/index.mts(2,20): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+
+
+==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+    export {x};
+==== tests/cases/conformance/node/subfolder/index.cts (3 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder/index.mts (3 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.ts (0 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.cts (3 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder2/index.mts (3 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.ts (0 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.mts (3 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/subfolder2/another/index.cts (3 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/index.mts (3 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/index.cts (3 errors) ====
+    // cjs format file
+    const x = <T>() => <T><any>(void 0);
+               ~
+!!! error TS7059: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+                       ~~~~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+                          ~~~~~~~~~~~~~
+!!! error TS7058: This syntax is reserved in files with this extension. Use an `as` expression instead.
+    export {x};
+==== tests/cases/conformance/node/index.ts (0 errors) ====
+    // esm format file
+    const x = <T>() => <T><any>(void 0);
+    export {x};
+==== tests/cases/conformance/node/package.json (0 errors) ====
+    {
+        "name": "package",
+        "private": true,
+        "type": "module"
+    }
+==== tests/cases/conformance/node/subfolder/package.json (0 errors) ====
+    {
+        "type": "commonjs"
+    }
+==== tests/cases/conformance/node/subfolder2/package.json (0 errors) ====
+    {
+    }
+==== tests/cases/conformance/node/subfolder2/another/package.json (0 errors) ====
+    {
+        "type": "module"
+    }
\ No newline at end of file
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).js b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).js
new file mode 100644
index 0000000000000..4cca6af5a58d7
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).js
@@ -0,0 +1,172 @@
+//// [tests/cases/conformance/node/nodeModulesForbidenSyntax.ts] ////
+
+//// [index.ts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.cts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.mts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.ts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.cts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.mts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.ts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.mts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.cts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.mts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.cts]
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [index.ts]
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+//// [package.json]
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+//// [package.json]
+{
+    "type": "commonjs"
+}
+//// [package.json]
+{
+}
+//// [package.json]
+{
+    "type": "module"
+}
+
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.js]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.js]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.mjs]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.mjs]
+// esm format file
+const x = () => (void 0);
+export { x };
+//// [index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.x = void 0;
+// cjs format file
+const x = () => (void 0);
+exports.x = x;
+//// [index.js]
+// esm format file
+const x = () => (void 0);
+export { x };
+
+
+//// [index.d.ts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.cts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.mts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.ts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.cts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.mts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.ts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.mts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.cts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.mts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.cts]
+declare const x: <T>() => T;
+export { x };
+//// [index.d.ts]
+declare const x: <T>() => T;
+export { x };
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).symbols b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).symbols
new file mode 100644
index 0000000000000..1ca35d0d3e32e
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).symbols
@@ -0,0 +1,120 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.cts, 1, 5))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.mts, 1, 5))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.ts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.cts, 1, 5))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.mts, 1, 5))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.ts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.mts, 1, 5))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/subfolder2/another/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.cts, 1, 5))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.mts, 1, 5))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+>T : Symbol(T, Decl(index.mts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.mts, 2, 8))
+
+=== tests/cases/conformance/node/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.cts, 1, 5))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+>T : Symbol(T, Decl(index.cts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.cts, 2, 8))
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : Symbol(x, Decl(index.ts, 1, 5))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+>T : Symbol(T, Decl(index.ts, 1, 11))
+
+export {x};
+>x : Symbol(x, Decl(index.ts, 2, 8))
+
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).types b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).types
new file mode 100644
index 0000000000000..016af4314d16b
--- /dev/null
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).types
@@ -0,0 +1,168 @@
+=== tests/cases/conformance/node/subfolder/index.ts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/index.ts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/another/index.ts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/another/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/subfolder2/another/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/index.mts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/index.cts ===
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
+=== tests/cases/conformance/node/index.ts ===
+// esm format file
+const x = <T>() => <T><any>(void 0);
+>x : <T>() => T
+><T>() => <T><any>(void 0) : <T>() => T
+><T><any>(void 0) : T
+><any>(void 0) : any
+>(void 0) : undefined
+>void 0 : undefined
+>0 : 0
+
+export {x};
+>x : <T>() => T
+
diff --git a/tests/baselines/reference/project/invalidRootFile/amd/invalidRootFile.errors.txt b/tests/baselines/reference/project/invalidRootFile/amd/invalidRootFile.errors.txt
index 071a8c6b528bc..ce9c2a81f90ee 100644
--- a/tests/baselines/reference/project/invalidRootFile/amd/invalidRootFile.errors.txt
+++ b/tests/baselines/reference/project/invalidRootFile/amd/invalidRootFile.errors.txt
@@ -1,10 +1,10 @@
 error TS6053: File 'a.ts' not found.
   The file is in the program because:
     Root file specified for compilation
-error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts'.
+error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
   The file is in the program because:
     Root file specified for compilation
-error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts'.
+error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
   The file is in the program because:
     Root file specified for compilation
 
@@ -12,9 +12,9 @@ error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx',
 !!! error TS6053: File 'a.ts' not found.
 !!! error TS6053:   The file is in the program because:
 !!! error TS6053:     Root file specified for compilation
-!!! error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts'.
+!!! error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
 !!! error TS6054:   The file is in the program because:
 !!! error TS6054:     Root file specified for compilation
-!!! error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts'.
+!!! error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
 !!! error TS6231:   The file is in the program because:
 !!! error TS6231:     Root file specified for compilation
\ No newline at end of file
diff --git a/tests/baselines/reference/project/invalidRootFile/node/invalidRootFile.errors.txt b/tests/baselines/reference/project/invalidRootFile/node/invalidRootFile.errors.txt
index 071a8c6b528bc..ce9c2a81f90ee 100644
--- a/tests/baselines/reference/project/invalidRootFile/node/invalidRootFile.errors.txt
+++ b/tests/baselines/reference/project/invalidRootFile/node/invalidRootFile.errors.txt
@@ -1,10 +1,10 @@
 error TS6053: File 'a.ts' not found.
   The file is in the program because:
     Root file specified for compilation
-error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts'.
+error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
   The file is in the program because:
     Root file specified for compilation
-error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts'.
+error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
   The file is in the program because:
     Root file specified for compilation
 
@@ -12,9 +12,9 @@ error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx',
 !!! error TS6053: File 'a.ts' not found.
 !!! error TS6053:   The file is in the program because:
 !!! error TS6053:     Root file specified for compilation
-!!! error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts'.
+!!! error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
 !!! error TS6054:   The file is in the program because:
 !!! error TS6054:     Root file specified for compilation
-!!! error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts'.
+!!! error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
 !!! error TS6231:   The file is in the program because:
 !!! error TS6231:     Root file specified for compilation
\ No newline at end of file
diff --git a/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js b/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js
new file mode 100644
index 0000000000000..03cd75fe0268e
--- /dev/null
+++ b/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js
@@ -0,0 +1,485 @@
+Input::
+//// [/user/username/projects/myproject/packages/pkg1/package.json]
+{"name":"pkg1","version":"1.0.0","main":"build/index.js","type":"module"}
+
+//// [/user/username/projects/myproject/packages/pkg1/index.ts]
+import type { TheNum } from 'pkg2'
+export const theNum: TheNum = 42;
+
+//// [/user/username/projects/myproject/packages/pkg1/tsconfig.json]
+{"compilerOptions":{"outDir":"build","module":"node12"},"references":[{"path":"../pkg2"}]}
+
+//// [/user/username/projects/myproject/packages/pkg2/const.cts]
+export type TheNum = 42;
+
+//// [/user/username/projects/myproject/packages/pkg2/index.ts]
+export type { TheNum } from './const.cjs';
+
+//// [/user/username/projects/myproject/packages/pkg2/tsconfig.json]
+{"compilerOptions":{"composite":true,"outDir":"build","module":"node12"}}
+
+//// [/user/username/projects/myproject/packages/pkg2/package.json]
+{"name":"pkg2","version":"1.0.0","main":"build/index.js","type":"module"}
+
+//// [/user/username/projects/myproject/node_modules/pkg2] symlink(/user/username/projects/myproject/packages/pkg2)
+//// [/a/lib/lib.es2020.full.d.ts]
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+
+
+/a/lib/tsc.js -b packages/pkg1 -w --verbose --traceResolution
+Output::
+>> Screen clear
+[12:00:41 AM] Starting compilation in watch mode...
+
+[12:00:42 AM] Projects in this build: 
+    * packages/pkg2/tsconfig.json
+    * packages/pkg1/tsconfig.json
+
+[12:00:43 AM] Project 'packages/pkg2/tsconfig.json' is out of date because output file 'packages/pkg2/build/const.cjs' does not exist
+
+[12:00:44 AM] Building project '/user/username/projects/myproject/packages/pkg2/tsconfig.json'...
+
+Found 'package.json' at '/user/username/projects/myproject/packages/pkg2/package.json'.
+'package.json' does not have a 'typesVersions' field.
+======== Resolving module './const.cjs' from '/user/username/projects/myproject/packages/pkg2/index.ts'. ========
+Module resolution kind is not specified, using 'Node12'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/packages/pkg2/const.cjs', target file type 'TypeScript'.
+File '/user/username/projects/myproject/packages/pkg2/const.cjs.ts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/const.cjs.tsx' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/const.cjs.d.ts' does not exist.
+File name '/user/username/projects/myproject/packages/pkg2/const.cjs' has a '.cjs' extension - stripping it.
+File '/user/username/projects/myproject/packages/pkg2/const.cts' exist - use it as a name resolution result.
+======== Module name './const.cjs' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/const.cts'. ========
+File '/a/lib/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+[12:01:00 AM] Project 'packages/pkg1/tsconfig.json' is out of date because output file 'packages/pkg1/build/index.js' does not exist
+
+[12:01:01 AM] Building project '/user/username/projects/myproject/packages/pkg1/tsconfig.json'...
+
+Found 'package.json' at '/user/username/projects/myproject/packages/pkg1/package.json'.
+'package.json' does not have a 'typesVersions' field.
+======== Resolving module 'pkg2' from '/user/username/projects/myproject/packages/pkg1/index.ts'. ========
+Module resolution kind is not specified, using 'Node12'.
+Loading module 'pkg2' from 'node_modules' folder, target file type 'TypeScript'.
+Directory '/user/username/projects/myproject/packages/pkg1/node_modules' does not exist, skipping all lookups in it.
+Directory '/user/username/projects/myproject/packages/node_modules' does not exist, skipping all lookups in it.
+Found 'package.json' at '/user/username/projects/myproject/node_modules/pkg2/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/user/username/projects/myproject/node_modules/pkg2.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2.d.ts' does not exist.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'build/index.js' that references '/user/username/projects/myproject/node_modules/pkg2/build/index.js'.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js' exist - use it as a name resolution result.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js' has an unsupported extension, so skipping it.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/node_modules/pkg2/build/index.js', target file type 'TypeScript'.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.d.ts' does not exist.
+File name '/user/username/projects/myproject/node_modules/pkg2/build/index.js' has a '.js' extension - stripping it.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts' exist - use it as a name resolution result.
+Resolving real path for '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts', result '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'.
+======== Module name 'pkg2' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/index.d.ts' with Package ID 'pkg2/build/index.d.ts@1.0.0'. ========
+File '/user/username/projects/myproject/packages/pkg2/build/package.json' does not exist.
+Found 'package.json' at '/user/username/projects/myproject/packages/pkg2/package.json'.
+'package.json' does not have a 'typesVersions' field.
+======== Resolving module './const.cjs' from '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'. ========
+Using compiler options of project reference redirect '/user/username/projects/myproject/packages/pkg2/tsconfig.json'.
+Module resolution kind is not specified, using 'Node12'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/packages/pkg2/build/const.cjs', target file type 'TypeScript'.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.ts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.tsx' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.d.ts' does not exist.
+File name '/user/username/projects/myproject/packages/pkg2/build/const.cjs' has a '.cjs' extension - stripping it.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.d.cts' exist - use it as a name resolution result.
+======== Module name './const.cjs' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/const.d.cts'. ========
+File '/a/lib/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+[12:01:07 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/packages/pkg2/const.cts","/user/username/projects/myproject/packages/pkg2/index.ts"]
+Program options: {"composite":true,"outDir":"/user/username/projects/myproject/packages/pkg2/build","module":100,"watch":true,"traceResolution":true,"configFilePath":"/user/username/projects/myproject/packages/pkg2/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.full.d.ts
+/user/username/projects/myproject/packages/pkg2/const.cts
+/user/username/projects/myproject/packages/pkg2/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.es2020.full.d.ts
+/user/username/projects/myproject/packages/pkg2/const.cts
+/user/username/projects/myproject/packages/pkg2/index.ts
+
+Shape signatures in builder refreshed for::
+/a/lib/lib.es2020.full.d.ts (used version)
+/user/username/projects/myproject/packages/pkg2/const.cts (used version)
+/user/username/projects/myproject/packages/pkg2/index.ts (used version)
+
+Program root files: ["/user/username/projects/myproject/packages/pkg1/index.ts"]
+Program options: {"outDir":"/user/username/projects/myproject/packages/pkg1/build","module":100,"watch":true,"traceResolution":true,"configFilePath":"/user/username/projects/myproject/packages/pkg1/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.full.d.ts
+/user/username/projects/myproject/packages/pkg2/build/index.d.ts
+/user/username/projects/myproject/packages/pkg1/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/a/lib/lib.es2020.full.d.ts
+/user/username/projects/myproject/packages/pkg2/build/index.d.ts
+/user/username/projects/myproject/packages/pkg1/index.ts
+
+Shape signatures in builder refreshed for::
+/a/lib/lib.es2020.full.d.ts (used version)
+/user/username/projects/myproject/packages/pkg2/build/index.d.ts (used version)
+/user/username/projects/myproject/packages/pkg1/index.ts (used version)
+
+WatchedFiles::
+/user/username/projects/myproject/packages/pkg2/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/const.cts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/index.ts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/index.ts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/index.ts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/packages/pkg2:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg2","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/packages/pkg1:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg1","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/packages/pkg2/build/const.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+
+
+//// [/user/username/projects/myproject/packages/pkg2/build/const.d.cts]
+export declare type TheNum = 42;
+
+
+//// [/user/username/projects/myproject/packages/pkg2/build/index.js]
+export {};
+
+
+//// [/user/username/projects/myproject/packages/pkg2/build/index.d.ts]
+export type { TheNum } from './const.cjs';
+
+
+//// [/user/username/projects/myproject/packages/pkg2/build/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../../../a/lib/lib.es2020.full.d.ts","../const.cts","../index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true},"-11202312776-export type TheNum = 42;","-9668872159-export type { TheNum } from './const.cjs';"],"options":{"composite":true,"module":100,"outDir":"./"},"fileIdsList":[[2]],"referencedMap":[[3,1]],"exportedModulesMap":[[3,1]],"semanticDiagnosticsPerFile":[1,2,3]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/packages/pkg2/build/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../../../a/lib/lib.es2020.full.d.ts",
+      "../const.cts",
+      "../index.ts"
+    ],
+    "fileNamesList": [
+      [
+        "../const.cts"
+      ]
+    ],
+    "fileInfos": {
+      "../../../../../../../a/lib/lib.es2020.full.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true
+      },
+      "../const.cts": {
+        "version": "-11202312776-export type TheNum = 42;",
+        "signature": "-11202312776-export type TheNum = 42;"
+      },
+      "../index.ts": {
+        "version": "-9668872159-export type { TheNum } from './const.cjs';",
+        "signature": "-9668872159-export type { TheNum } from './const.cjs';"
+      }
+    },
+    "options": {
+      "composite": true,
+      "module": 100,
+      "outDir": "./"
+    },
+    "referencedMap": {
+      "../index.ts": [
+        "../const.cts"
+      ]
+    },
+    "exportedModulesMap": {
+      "../index.ts": [
+        "../const.cts"
+      ]
+    },
+    "semanticDiagnosticsPerFile": [
+      "../../../../../../../a/lib/lib.es2020.full.d.ts",
+      "../const.cts",
+      "../index.ts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 808
+}
+
+//// [/user/username/projects/myproject/packages/pkg1/build/index.js]
+export const theNum = 42;
+
+
+
+Change:: reports import errors after change to package file
+
+Input::
+//// [/user/username/projects/myproject/packages/pkg1/package.json]
+{"name":"pkg1","version":"1.0.0","main":"build/index.js","type":"commonjs"}
+
+
+Output::
+
+WatchedFiles::
+/user/username/projects/myproject/packages/pkg2/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/const.cts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/index.ts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/index.ts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/index.ts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/packages/pkg2:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg2","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/packages/pkg1:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg1","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+
+Change:: removes those errors when a package file is changed back
+
+Input::
+//// [/user/username/projects/myproject/packages/pkg1/package.json]
+{"name":"pkg1","version":"1.0.0","main":"build/index.js","type":"module"}
+
+
+Output::
+
+WatchedFiles::
+/user/username/projects/myproject/packages/pkg2/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/const.cts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/index.ts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/index.ts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/index.ts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/packages/pkg2:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg2","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/packages/pkg1:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg1","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+
+Change:: reports import errors after change to package file
+
+Input::
+//// [/user/username/projects/myproject/packages/pkg1/package.json]
+{"name":"pkg1","version":"1.0.0","main":"build/index.js","type":"commonjs"}
+
+
+Output::
+
+WatchedFiles::
+/user/username/projects/myproject/packages/pkg2/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/const.cts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/index.ts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/index.ts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/index.ts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/packages/pkg2:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg2","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/packages/pkg1:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg1","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+
+Change:: removes those errors when a package file is changed to cjs extensions
+
+Input::
+//// [/user/username/projects/myproject/packages/pkg2/package.json] file written with same contents
+//// [/user/username/projects/myproject/packages/pkg2/index.cts]
+export type { TheNum } from './const.cjs';
+
+//// [/user/username/projects/myproject/packages/pkg2/index.ts] deleted
+
+Output::
+>> Screen clear
+[12:01:23 AM] File change detected. Starting incremental compilation...
+
+[12:01:24 AM] Project 'packages/pkg2/tsconfig.json' is out of date because oldest output 'packages/pkg2/build/const.cjs' is older than newest input 'packages/pkg2/index.cts'
+
+[12:01:25 AM] Building project '/user/username/projects/myproject/packages/pkg2/tsconfig.json'...
+
+======== Resolving module './const.cjs' from '/user/username/projects/myproject/packages/pkg2/index.cts'. ========
+Module resolution kind is not specified, using 'Node12'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/packages/pkg2/const.cjs', target file type 'TypeScript'.
+File '/user/username/projects/myproject/packages/pkg2/const.cjs.ts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/const.cjs.tsx' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/const.cjs.d.ts' does not exist.
+File name '/user/username/projects/myproject/packages/pkg2/const.cjs' has a '.cjs' extension - stripping it.
+File '/user/username/projects/myproject/packages/pkg2/const.cts' exist - use it as a name resolution result.
+======== Module name './const.cjs' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/const.cts'. ========
+File '/a/lib/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+[12:01:34 AM] Updating unchanged output timestamps of project '/user/username/projects/myproject/packages/pkg2/tsconfig.json'...
+
+
+
+Program root files: ["/user/username/projects/myproject/packages/pkg2/const.cts","/user/username/projects/myproject/packages/pkg2/index.cts"]
+Program options: {"composite":true,"outDir":"/user/username/projects/myproject/packages/pkg2/build","module":100,"watch":true,"traceResolution":true,"configFilePath":"/user/username/projects/myproject/packages/pkg2/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.full.d.ts
+/user/username/projects/myproject/packages/pkg2/const.cts
+/user/username/projects/myproject/packages/pkg2/index.cts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/packages/pkg2/index.cts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/packages/pkg2/index.cts (computed .d.ts)
+
+WatchedFiles::
+/user/username/projects/myproject/packages/pkg2/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/const.cts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/tsconfig.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/index.ts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/index.cts:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/index.cts","pollingInterval":250}
+
+FsWatches::
+
+FsWatchesRecursive::
+/user/username/projects/myproject/packages/pkg2:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg2","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+/user/username/projects/myproject/packages/pkg1:
+  {"directoryName":"/user/username/projects/myproject/packages/pkg1","fallbackPollingInterval":500,"fallbackOptions":{"watchFile":"PriorityPollingInterval"}}
+
+exitCode:: ExitStatus.undefined
+
+//// [/user/username/projects/myproject/packages/pkg2/build/const.cjs] file changed its modified time
+//// [/user/username/projects/myproject/packages/pkg2/build/const.d.cts] file changed its modified time
+//// [/user/username/projects/myproject/packages/pkg2/build/tsconfig.tsbuildinfo]
+{"program":{"fileNames":["../../../../../../../a/lib/lib.es2020.full.d.ts","../const.cts","../index.cts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true},"-11202312776-export type TheNum = 42;",{"version":"-9668872159-export type { TheNum } from './const.cjs';","signature":"-9835135925-export type { TheNum } from './const.cjs';\n"}],"options":{"composite":true,"module":100,"outDir":"./"},"fileIdsList":[[2]],"referencedMap":[[3,1]],"exportedModulesMap":[[3,1]],"semanticDiagnosticsPerFile":[1,2,3]},"version":"FakeTSVersion"}
+
+//// [/user/username/projects/myproject/packages/pkg2/build/tsconfig.tsbuildinfo.readable.baseline.txt]
+{
+  "program": {
+    "fileNames": [
+      "../../../../../../../a/lib/lib.es2020.full.d.ts",
+      "../const.cts",
+      "../index.cts"
+    ],
+    "fileNamesList": [
+      [
+        "../const.cts"
+      ]
+    ],
+    "fileInfos": {
+      "../../../../../../../a/lib/lib.es2020.full.d.ts": {
+        "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
+        "affectsGlobalScope": true
+      },
+      "../const.cts": {
+        "version": "-11202312776-export type TheNum = 42;",
+        "signature": "-11202312776-export type TheNum = 42;"
+      },
+      "../index.cts": {
+        "version": "-9668872159-export type { TheNum } from './const.cjs';",
+        "signature": "-9835135925-export type { TheNum } from './const.cjs';\n"
+      }
+    },
+    "options": {
+      "composite": true,
+      "module": 100,
+      "outDir": "./"
+    },
+    "referencedMap": {
+      "../index.cts": [
+        "../const.cts"
+      ]
+    },
+    "exportedModulesMap": {
+      "../index.cts": [
+        "../const.cts"
+      ]
+    },
+    "semanticDiagnosticsPerFile": [
+      "../../../../../../../a/lib/lib.es2020.full.d.ts",
+      "../const.cts",
+      "../index.cts"
+    ]
+  },
+  "version": "FakeTSVersion",
+  "size": 892
+}
+
+//// [/user/username/projects/myproject/packages/pkg2/build/index.cjs]
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+
+
+//// [/user/username/projects/myproject/packages/pkg2/build/index.d.cts]
+export type { TheNum } from './const.cjs';
+
+
diff --git a/tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts b/tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts
index 9b27ee95c1789..174300a96b045 100644
--- a/tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts
+++ b/tests/cases/conformance/node/allowJs/nodeModulesAllowJs1.ts
@@ -7,15 +7,120 @@
 // cjs format file
 const x = 1;
 export {x};
+// @filename: subfolder/index.cjs
+// cjs format file
+const x = 1;
+export {x};
+// @filename: subfolder/index.mjs
+// esm format file
+const x = 1;
+export {x};
 // @filename: subfolder2/index.js
 // cjs format file
 const x = 1;
 export {x};
+// @filename: subfolder2/index.cjs
+// cjs format file
+const x = 1;
+export {x};
+// @filename: subfolder2/index.mjs
+// esm format file
+const x = 1;
+export {x};
 // @filename: subfolder2/another/index.js
 // esm format file
 const x = 1;
 export {x};
+// @filename: subfolder2/another/index.cjs
+// cjs format file
+const x = 1;
+export {x};
+// @filename: subfolder2/another/index.mjs
+// esm format file
+const x = 1;
+export {x};
 // @filename: index.js
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export {x};
+// @filename: index.cjs
+// ESM format imports below should error
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+export {x};
+// @filename: index.mjs
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export {x};
diff --git a/tests/cases/conformance/node/nodeModules1.ts b/tests/cases/conformance/node/nodeModules1.ts
index 349d103b0efcf..b0ba13a1e346e 100644
--- a/tests/cases/conformance/node/nodeModules1.ts
+++ b/tests/cases/conformance/node/nodeModules1.ts
@@ -4,15 +4,120 @@
 // cjs format file
 const x = 1;
 export {x};
+// @filename: subfolder/index.cts
+// cjs format file
+const x = 1;
+export {x};
+// @filename: subfolder/index.mts
+// esm format file
+const x = 1;
+export {x};
 // @filename: subfolder2/index.ts
 // cjs format file
 const x = 1;
 export {x};
+// @filename: subfolder2/index.cts
+// cjs format file
+const x = 1;
+export {x};
+// @filename: subfolder2/index.mts
+// esm format file
+const x = 1;
+export {x};
 // @filename: subfolder2/another/index.ts
 // esm format file
 const x = 1;
 export {x};
+// @filename: subfolder2/another/index.mts
+// esm format file
+const x = 1;
+export {x};
+// @filename: subfolder2/another/index.cts
+// cjs format file
+const x = 1;
+export {x};
+// @filename: index.mts
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// esm format file
+const x = 1;
+export {x};
+// @filename: index.cts
+// ESM-format imports below should issue errors
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
+// cjs format file
+const x = 1;
+export {x};
 // @filename: index.ts
+import * as m1 from "./index.js";
+import * as m2 from "./index.mjs";
+import * as m3 from "./index.cjs";
+import * as m4 from "./subfolder/index.js";
+import * as m5 from "./subfolder/index.mjs";
+import * as m6 from "./subfolder/index.cjs";
+import * as m7 from "./subfolder2/index.js";
+import * as m8 from "./subfolder2/index.mjs";
+import * as m9 from "./subfolder2/index.cjs";
+import * as m10 from "./subfolder2/another/index.js";
+import * as m11 from "./subfolder2/another/index.mjs";
+import * as m12 from "./subfolder2/another/index.cjs";
+void m1;
+void m2;
+void m3;
+void m4;
+void m5;
+void m6;
+void m7;
+void m8;
+void m9;
+void m10;
+void m11;
+void m12;
 // esm format file
 const x = 1;
 export {x};
diff --git a/tests/cases/conformance/node/nodeModulesForbidenSyntax.ts b/tests/cases/conformance/node/nodeModulesForbidenSyntax.ts
new file mode 100644
index 0000000000000..d441627d7d0c4
--- /dev/null
+++ b/tests/cases/conformance/node/nodeModulesForbidenSyntax.ts
@@ -0,0 +1,67 @@
+// @module: node12,nodenext
+// @declaration: true
+// @filename: subfolder/index.ts
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: subfolder/index.cts
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: subfolder/index.mts
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: subfolder2/index.ts
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: subfolder2/index.cts
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: subfolder2/index.mts
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: subfolder2/another/index.ts
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: subfolder2/another/index.mts
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: subfolder2/another/index.cts
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: index.mts
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: index.cts
+// cjs format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: index.ts
+// esm format file
+const x = <T>() => <T><any>(void 0);
+export {x};
+// @filename: package.json
+{
+    "name": "package",
+    "private": true,
+    "type": "module"
+}
+// @filename: subfolder/package.json
+{
+    "type": "commonjs"
+}
+// @filename: subfolder2/package.json
+{
+}
+// @filename: subfolder2/another/package.json
+{
+    "type": "module"
+}
\ No newline at end of file

From e6a386c9b4de959af044ce50f8764b2ca6704add Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Thu, 26 Aug 2021 14:41:55 -0700
Subject: [PATCH 5/9] Fix watch of files whose intepretation changes due to a
 package.json update

---
 src/compiler/builder.ts                       |  18 +-
 src/compiler/builderState.ts                  |   3 +-
 src/compiler/program.ts                       |   1 +
 src/compiler/tsbuildPublic.ts                 |   1 +
 src/compiler/types.ts                         |   4 +
 .../unittests/tsbuild/moduleResolution.ts     |   4 +-
 .../unittests/tscWatch/incremental.ts         |   3 +
 .../reference/api/tsserverlibrary.d.ts        |   4 +
 tests/baselines/reference/api/typescript.d.ts |   4 +
 ...t-correctly-with-cts-and-mts-extensions.js | 343 ++++++++++++++++--
 10 files changed, 350 insertions(+), 35 deletions(-)

diff --git a/src/compiler/builder.ts b/src/compiler/builder.ts
index 2b578cecfc035..aec8cae3cea12 100644
--- a/src/compiler/builder.ts
+++ b/src/compiler/builder.ts
@@ -258,6 +258,14 @@ namespace ts {
             Debug.assert(!state.seenAffectedFiles || !state.seenAffectedFiles.size);
             state.seenAffectedFiles = state.seenAffectedFiles || new Set();
         }
+        if (useOldState) {
+            // Any time the interpretation of a source file changes, mark it as changed
+            forEachEntry(oldState!.fileInfos, (info, sourceFilePath) => {
+                if (state.fileInfos.has(sourceFilePath) && state.fileInfos.get(sourceFilePath)!.impliedFormat !== info.impliedFormat) {
+                    state.changedFilesSet.add(sourceFilePath);
+                }
+            });
+        }
 
         state.buildInfoEmitPending = !!state.changedFilesSet.size;
         return state;
@@ -744,13 +752,13 @@ namespace ts {
             const actualSignature = signature ?? value.signature;
             return value.version === actualSignature ?
                 value.affectsGlobalScope ?
-                    { version: value.version, signature: undefined, affectsGlobalScope: true } :
+                    { version: value.version, signature: undefined, affectsGlobalScope: true, impliedFormat: value.impliedFormat } :
                     value.version :
                 actualSignature !== undefined ?
                     signature === undefined ?
                         value :
-                        { version: value.version, signature, affectsGlobalScope: value.affectsGlobalScope } :
-                    { version: value.version, signature: false, affectsGlobalScope: value.affectsGlobalScope };
+                        { version: value.version, signature, affectsGlobalScope: value.affectsGlobalScope, impliedFormat: value.impliedFormat } :
+                    { version: value.version, signature: false, affectsGlobalScope: value.affectsGlobalScope, impliedFormat: value.impliedFormat };
         });
 
         let referencedMap: ProgramBuildInfoReferencedMap | undefined;
@@ -1243,10 +1251,10 @@ namespace ts {
 
     export function toBuilderStateFileInfo(fileInfo: ProgramBuildInfoFileInfo): BuilderState.FileInfo {
         return isString(fileInfo) ?
-            { version: fileInfo, signature: fileInfo, affectsGlobalScope: undefined } :
+            { version: fileInfo, signature: fileInfo, affectsGlobalScope: undefined, impliedFormat: undefined } :
             isString(fileInfo.signature) ?
                 fileInfo as BuilderState.FileInfo :
-                { version: fileInfo.version, signature: fileInfo.signature === false ? undefined : fileInfo.version, affectsGlobalScope: fileInfo.affectsGlobalScope };
+                { version: fileInfo.version, signature: fileInfo.signature === false ? undefined : fileInfo.version, affectsGlobalScope: fileInfo.affectsGlobalScope, impliedFormat: fileInfo.impliedFormat };
     }
 
     export function createBuildProgramUsingProgramBuildInfo(program: ProgramBuildInfo, buildInfoPath: string, host: ReadBuildProgramHost): EmitAndSemanticDiagnosticsBuilderProgram {
diff --git a/src/compiler/builderState.ts b/src/compiler/builderState.ts
index f48d52c3e9d6b..a64a6c13ed1e8 100644
--- a/src/compiler/builderState.ts
+++ b/src/compiler/builderState.ts
@@ -82,6 +82,7 @@ namespace ts {
             readonly version: string;
             signature: string | undefined;
             affectsGlobalScope: boolean | undefined;
+            impliedFormat: number | undefined;
         }
 
         export interface ReadonlyManyToManyPathMap {
@@ -332,7 +333,7 @@ namespace ts {
                         }
                     }
                 }
-                fileInfos.set(sourceFile.resolvedPath, { version, signature: oldInfo && oldInfo.signature, affectsGlobalScope: isFileAffectingGlobalScope(sourceFile) || undefined });
+                fileInfos.set(sourceFile.resolvedPath, { version, signature: oldInfo && oldInfo.signature, affectsGlobalScope: isFileAffectingGlobalScope(sourceFile) || undefined, impliedFormat: sourceFile.impliedNodeFormat });
             }
 
             return {
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index 932fdebe43607..e446b32df7626 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -903,6 +903,7 @@ namespace ts {
                 withExtension.extension = extensionFromPath(resolved.resolvedFileName);
                 return withExtension;
             });
+            moduleResolutionCache = host.getModuleResolutionCache?.();
         }
         else {
             moduleResolutionCache = createModuleResolutionCache(currentDirectory, getCanonicalFileName, options);
diff --git a/src/compiler/tsbuildPublic.ts b/src/compiler/tsbuildPublic.ts
index b92741a3de8dc..e8c0b689c62f1 100644
--- a/src/compiler/tsbuildPublic.ts
+++ b/src/compiler/tsbuildPublic.ts
@@ -284,6 +284,7 @@ namespace ts {
             const loader = (moduleName: string, containingFile: string, redirectedReference: ResolvedProjectReference | undefined) => resolveModuleName(moduleName, containingFile, state.projectCompilerOptions, compilerHost, moduleResolutionCache, redirectedReference).resolvedModule!;
             compilerHost.resolveModuleNames = (moduleNames, containingFile, _reusedNames, redirectedReference) =>
                 loadWithLocalCache<ResolvedModuleFull>(Debug.checkEachDefined(moduleNames), containingFile, redirectedReference, loader);
+            compilerHost.getModuleResolutionCache = () => moduleResolutionCache;
         }
         if (!compilerHost.resolveTypeReferenceDirectives) {
             const loader = (moduleName: string, containingFile: string, redirectedReference: ResolvedProjectReference | undefined) => resolveTypeReferenceDirective(moduleName, containingFile, state.projectCompilerOptions, compilerHost, redirectedReference, state.typeReferenceDirectiveResolutionCache).resolvedTypeReferenceDirective!;
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 3652e55cd5e67..829498244e4e9 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -6609,6 +6609,10 @@ namespace ts {
          * 'throw new Error("NotImplemented")'
          */
         resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions): (ResolvedModule | undefined)[];
+        /**
+         * Returns the module resolution cache used by a provided `resolveModuleNames` implementation so that any non-name module resolution operations (eg, package.json lookup) can reuse it
+         */
+        getModuleResolutionCache?(): ModuleResolutionCache | undefined;
         /**
          * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
          */
diff --git a/src/testRunner/unittests/tsbuild/moduleResolution.ts b/src/testRunner/unittests/tsbuild/moduleResolution.ts
index 0bf612f192c89..0ac722293626f 100644
--- a/src/testRunner/unittests/tsbuild/moduleResolution.ts
+++ b/src/testRunner/unittests/tsbuild/moduleResolution.ts
@@ -148,8 +148,8 @@ namespace ts.tscWatch {
                 {
                     caption: "removes those errors when a package file is changed to cjs extensions",
                     change: sys => {
-                        replaceFileText(sys, `${projectRoot}/packages/pkg2/package.json`, `"main": "build/index.js"`, `"main": "build/index.cjs"`);
-                        sys.renameFile(`${projectRoot}/packages/pkg2/index.ts`, `${projectRoot}/packages/pkg2/index.cts`)
+                        replaceFileText(sys, `${projectRoot}/packages/pkg2/package.json`, `"build/index.js"`, `"build/index.cjs"`);
+                        sys.renameFile(`${projectRoot}/packages/pkg2/index.ts`, `${projectRoot}/packages/pkg2/index.cts`);
                     },
                     timeouts: runQueuedTimeoutCallbacks,
                 },
diff --git a/src/testRunner/unittests/tscWatch/incremental.ts b/src/testRunner/unittests/tscWatch/incremental.ts
index bc6e541815a5c..8da2d0c09c4ba 100644
--- a/src/testRunner/unittests/tscWatch/incremental.ts
+++ b/src/testRunner/unittests/tscWatch/incremental.ts
@@ -163,16 +163,19 @@ namespace ts.tscWatch {
                         version: system.createHash(libFile.content),
                         signature: system.createHash(libFile.content),
                         affectsGlobalScope: true,
+                        impliedFormat: undefined,
                     });
                     assert.deepEqual(state.fileInfos.get(file1.path as Path), {
                         version: system.createHash(file1.content),
                         signature: system.createHash(file1.content),
                         affectsGlobalScope: undefined,
+                        impliedFormat: undefined,
                     });
                     assert.deepEqual(state.fileInfos.get(file2.path as Path), {
                         version: system.createHash(fileModified.content),
                         signature: system.createHash(fileModified.content),
                         affectsGlobalScope: undefined,
+                        impliedFormat: undefined,
                     });
 
                     assert.deepEqual(state.compilerOptions, {
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 8474b288eb1cc..1f4f871ddf5b5 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -3163,6 +3163,10 @@ declare namespace ts {
         getNewLine(): string;
         readDirectory?(rootDir: string, extensions: readonly string[], excludes: readonly string[] | undefined, includes: readonly string[], depth?: number): string[];
         resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions): (ResolvedModule | undefined)[];
+        /**
+         * Returns the module resolution cache used by a provided `resolveModuleNames` implementation so that any non-name module resolution operations (eg, package.json lookup) can reuse it
+         */
+        getModuleResolutionCache?(): ModuleResolutionCache | undefined;
         /**
          * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
          */
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 273ac73c3011b..c96afc78fcbfd 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -3163,6 +3163,10 @@ declare namespace ts {
         getNewLine(): string;
         readDirectory?(rootDir: string, extensions: readonly string[], excludes: readonly string[] | undefined, includes: readonly string[], depth?: number): string[];
         resolveModuleNames?(moduleNames: string[], containingFile: string, reusedNames: string[] | undefined, redirectedReference: ResolvedProjectReference | undefined, options: CompilerOptions): (ResolvedModule | undefined)[];
+        /**
+         * Returns the module resolution cache used by a provided `resolveModuleNames` implementation so that any non-name module resolution operations (eg, package.json lookup) can reuse it
+         */
+        getModuleResolutionCache?(): ModuleResolutionCache | undefined;
         /**
          * This method is a companion for 'resolveModuleNames' and is used to resolve 'types' references to actual type declaration files
          */
diff --git a/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js b/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js
index 1d8fe17b077e9..1a445f232047e 100644
--- a/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js
+++ b/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js
@@ -95,8 +95,7 @@ File '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts' exis
 Resolving real path for '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts', result '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'.
 ======== Module name 'pkg2' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/index.d.ts' with Package ID 'pkg2/build/index.d.ts@1.0.0'. ========
 File '/user/username/projects/myproject/packages/pkg2/build/package.json' does not exist.
-Found 'package.json' at '/user/username/projects/myproject/packages/pkg2/package.json'.
-'package.json' does not have a 'typesVersions' field.
+File '/user/username/projects/myproject/packages/pkg2/package.json' exists according to earlier cached lookups.
 ======== Resolving module './const.cjs' from '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'. ========
 Using compiler options of project reference redirect '/user/username/projects/myproject/packages/pkg2/tsconfig.json'.
 Module resolution kind is not specified, using 'Node12'.
@@ -108,9 +107,9 @@ File name '/user/username/projects/myproject/packages/pkg2/build/const.cjs' has
 File '/user/username/projects/myproject/packages/pkg2/build/const.cts' does not exist.
 File '/user/username/projects/myproject/packages/pkg2/build/const.d.cts' exist - use it as a name resolution result.
 ======== Module name './const.cjs' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/const.d.cts'. ========
-File '/a/lib/package.json' does not exist.
-File '/a/package.json' does not exist.
-File '/package.json' does not exist.
+File '/a/lib/package.json' does not exist according to earlier cached lookups.
+File '/a/package.json' does not exist according to earlier cached lookups.
+File '/package.json' does not exist according to earlier cached lookups.
 [12:01:07 AM] Found 0 errors. Watching for file changes.
 
 
@@ -158,12 +157,26 @@ WatchedFiles::
   {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg2/index.ts:
   {"fileName":"/user/username/projects/myproject/packages/pkg2/index.ts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/a/lib/package.json:
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+/a/package.json:
+  {"fileName":"/a/package.json","pollingInterval":250}
+  {"fileName":"/a/package.json","pollingInterval":250}
+/package.json:
+  {"fileName":"/package.json","pollingInterval":250}
+  {"fileName":"/package.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/tsconfig.json:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/index.ts:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
-/user/username/projects/myproject/packages/pkg2/package.json:
-  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/build/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/build/package.json","pollingInterval":250}
 
 FsWatches::
 
@@ -193,7 +206,7 @@ export type { TheNum } from './const.cjs';
 
 
 //// [/user/username/projects/myproject/packages/pkg2/build/tsconfig.tsbuildinfo]
-{"program":{"fileNames":["../../../../../../../a/lib/lib.es2020.full.d.ts","../const.cts","../index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true},"-11202312776-export type TheNum = 42;","-9668872159-export type { TheNum } from './const.cjs';"],"options":{"composite":true,"module":100,"outDir":"./"},"fileIdsList":[[2]],"referencedMap":[[3,1]],"exportedModulesMap":[[3,1]],"semanticDiagnosticsPerFile":[1,2,3]},"version":"FakeTSVersion"}
+{"program":{"fileNames":["../../../../../../../a/lib/lib.es2020.full.d.ts","../const.cts","../index.ts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true,"impliedFormat":1},"-11202312776-export type TheNum = 42;","-9668872159-export type { TheNum } from './const.cjs';"],"options":{"composite":true,"module":100,"outDir":"./"},"fileIdsList":[[2]],"referencedMap":[[3,1]],"exportedModulesMap":[[3,1]],"semanticDiagnosticsPerFile":[1,2,3]},"version":"FakeTSVersion"}
 
 //// [/user/username/projects/myproject/packages/pkg2/build/tsconfig.tsbuildinfo.readable.baseline.txt]
 {
@@ -212,7 +225,8 @@ export type { TheNum } from './const.cjs';
       "../../../../../../../a/lib/lib.es2020.full.d.ts": {
         "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
         "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
-        "affectsGlobalScope": true
+        "affectsGlobalScope": true,
+        "impliedFormat": 1
       },
       "../const.cts": {
         "version": "-11202312776-export type TheNum = 42;",
@@ -245,7 +259,7 @@ export type { TheNum } from './const.cjs';
     ]
   },
   "version": "FakeTSVersion",
-  "size": 808
+  "size": 826
 }
 
 //// [/user/username/projects/myproject/packages/pkg1/build/index.js]
@@ -261,6 +275,79 @@ Input::
 
 
 Output::
+>> Screen clear
+[12:01:11 AM] File change detected. Starting incremental compilation...
+
+[12:01:12 AM] Project 'packages/pkg1/tsconfig.json' is out of date because oldest output 'packages/pkg1/build/index.js' is older than newest input 'packages/pkg2'
+
+[12:01:13 AM] Building project '/user/username/projects/myproject/packages/pkg1/tsconfig.json'...
+
+Found 'package.json' at '/user/username/projects/myproject/packages/pkg1/package.json'.
+'package.json' does not have a 'typesVersions' field.
+======== Resolving module 'pkg2' from '/user/username/projects/myproject/packages/pkg1/index.ts'. ========
+Module resolution kind is not specified, using 'Node12'.
+Loading module 'pkg2' from 'node_modules' folder, target file type 'TypeScript'.
+Directory '/user/username/projects/myproject/packages/pkg1/node_modules' does not exist, skipping all lookups in it.
+Directory '/user/username/projects/myproject/packages/node_modules' does not exist, skipping all lookups in it.
+Found 'package.json' at '/user/username/projects/myproject/node_modules/pkg2/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/user/username/projects/myproject/node_modules/pkg2.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2.d.ts' does not exist.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'build/index.js' that references '/user/username/projects/myproject/node_modules/pkg2/build/index.js'.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js' exist - use it as a name resolution result.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js' has an unsupported extension, so skipping it.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/node_modules/pkg2/build/index.js', target file type 'TypeScript'.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.d.ts' does not exist.
+File name '/user/username/projects/myproject/node_modules/pkg2/build/index.js' has a '.js' extension - stripping it.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts' exist - use it as a name resolution result.
+Resolving real path for '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts', result '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'.
+======== Module name 'pkg2' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/index.d.ts' with Package ID 'pkg2/build/index.d.ts@1.0.0'. ========
+File '/user/username/projects/myproject/packages/pkg2/build/package.json' does not exist.
+Found 'package.json' at '/user/username/projects/myproject/packages/pkg2/package.json'.
+'package.json' does not have a 'typesVersions' field.
+======== Resolving module './const.cjs' from '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'. ========
+Using compiler options of project reference redirect '/user/username/projects/myproject/packages/pkg2/tsconfig.json'.
+Module resolution kind is not specified, using 'Node12'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/packages/pkg2/build/const.cjs', target file type 'TypeScript'.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.ts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.tsx' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.d.ts' does not exist.
+File name '/user/username/projects/myproject/packages/pkg2/build/const.cjs' has a '.cjs' extension - stripping it.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.d.cts' exist - use it as a name resolution result.
+======== Module name './const.cjs' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/const.d.cts'. ========
+File '/a/lib/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+packages/pkg1/index.ts:1:29 - error TS1445: Module 'pkg2' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+
+1 import type { TheNum } from 'pkg2'
+                              ~~~~~~
+
+[12:01:14 AM] Found 1 error. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/packages/pkg1/index.ts"]
+Program options: {"outDir":"/user/username/projects/myproject/packages/pkg1/build","module":100,"watch":true,"traceResolution":true,"configFilePath":"/user/username/projects/myproject/packages/pkg1/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.full.d.ts
+/user/username/projects/myproject/packages/pkg2/build/index.d.ts
+/user/username/projects/myproject/packages/pkg1/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/packages/pkg1/index.ts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/packages/pkg1/index.ts (computed .d.ts)
 
 WatchedFiles::
 /user/username/projects/myproject/packages/pkg2/tsconfig.json:
@@ -269,12 +356,26 @@ WatchedFiles::
   {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg2/index.ts:
   {"fileName":"/user/username/projects/myproject/packages/pkg2/index.ts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/a/lib/package.json:
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+/a/package.json:
+  {"fileName":"/a/package.json","pollingInterval":250}
+  {"fileName":"/a/package.json","pollingInterval":250}
+/package.json:
+  {"fileName":"/package.json","pollingInterval":250}
+  {"fileName":"/package.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/tsconfig.json:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/index.ts:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
-/user/username/projects/myproject/packages/pkg2/package.json:
-  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/build/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/build/package.json","pollingInterval":250}
 
 FsWatches::
 
@@ -295,6 +396,74 @@ Input::
 
 
 Output::
+>> Screen clear
+[12:01:18 AM] File change detected. Starting incremental compilation...
+
+[12:01:19 AM] Project 'packages/pkg1/tsconfig.json' is out of date because oldest output 'packages/pkg1/build/index.js' is older than newest input 'packages/pkg2'
+
+[12:01:20 AM] Building project '/user/username/projects/myproject/packages/pkg1/tsconfig.json'...
+
+Found 'package.json' at '/user/username/projects/myproject/packages/pkg1/package.json'.
+'package.json' does not have a 'typesVersions' field.
+======== Resolving module 'pkg2' from '/user/username/projects/myproject/packages/pkg1/index.ts'. ========
+Module resolution kind is not specified, using 'Node12'.
+Loading module 'pkg2' from 'node_modules' folder, target file type 'TypeScript'.
+Directory '/user/username/projects/myproject/packages/pkg1/node_modules' does not exist, skipping all lookups in it.
+Directory '/user/username/projects/myproject/packages/node_modules' does not exist, skipping all lookups in it.
+Found 'package.json' at '/user/username/projects/myproject/node_modules/pkg2/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/user/username/projects/myproject/node_modules/pkg2.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2.d.ts' does not exist.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'build/index.js' that references '/user/username/projects/myproject/node_modules/pkg2/build/index.js'.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js' exist - use it as a name resolution result.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js' has an unsupported extension, so skipping it.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/node_modules/pkg2/build/index.js', target file type 'TypeScript'.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.d.ts' does not exist.
+File name '/user/username/projects/myproject/node_modules/pkg2/build/index.js' has a '.js' extension - stripping it.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts' exist - use it as a name resolution result.
+Resolving real path for '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts', result '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'.
+======== Module name 'pkg2' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/index.d.ts' with Package ID 'pkg2/build/index.d.ts@1.0.0'. ========
+File '/user/username/projects/myproject/packages/pkg2/build/package.json' does not exist.
+Found 'package.json' at '/user/username/projects/myproject/packages/pkg2/package.json'.
+'package.json' does not have a 'typesVersions' field.
+======== Resolving module './const.cjs' from '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'. ========
+Using compiler options of project reference redirect '/user/username/projects/myproject/packages/pkg2/tsconfig.json'.
+Module resolution kind is not specified, using 'Node12'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/packages/pkg2/build/const.cjs', target file type 'TypeScript'.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.ts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.tsx' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.d.ts' does not exist.
+File name '/user/username/projects/myproject/packages/pkg2/build/const.cjs' has a '.cjs' extension - stripping it.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.d.cts' exist - use it as a name resolution result.
+======== Module name './const.cjs' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/const.d.cts'. ========
+File '/a/lib/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+[12:01:24 AM] Found 0 errors. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/packages/pkg1/index.ts"]
+Program options: {"outDir":"/user/username/projects/myproject/packages/pkg1/build","module":100,"watch":true,"traceResolution":true,"configFilePath":"/user/username/projects/myproject/packages/pkg1/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.full.d.ts
+/user/username/projects/myproject/packages/pkg2/build/index.d.ts
+/user/username/projects/myproject/packages/pkg1/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/packages/pkg1/index.ts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/packages/pkg1/index.ts (computed .d.ts)
 
 WatchedFiles::
 /user/username/projects/myproject/packages/pkg2/tsconfig.json:
@@ -303,12 +472,26 @@ WatchedFiles::
   {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg2/index.ts:
   {"fileName":"/user/username/projects/myproject/packages/pkg2/index.ts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/a/lib/package.json:
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+/a/package.json:
+  {"fileName":"/a/package.json","pollingInterval":250}
+  {"fileName":"/a/package.json","pollingInterval":250}
+/package.json:
+  {"fileName":"/package.json","pollingInterval":250}
+  {"fileName":"/package.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/tsconfig.json:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/index.ts:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
-/user/username/projects/myproject/packages/pkg2/package.json:
-  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/build/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/build/package.json","pollingInterval":250}
 
 FsWatches::
 
@@ -320,6 +503,7 @@ FsWatchesRecursive::
 
 exitCode:: ExitStatus.undefined
 
+//// [/user/username/projects/myproject/packages/pkg1/build/index.js] file written with same contents
 
 Change:: reports import errors after change to package file
 
@@ -329,6 +513,79 @@ Input::
 
 
 Output::
+>> Screen clear
+[12:01:28 AM] File change detected. Starting incremental compilation...
+
+[12:01:29 AM] Project 'packages/pkg1/tsconfig.json' is out of date because oldest output 'packages/pkg1/build/index.js' is older than newest input 'packages/pkg2'
+
+[12:01:30 AM] Building project '/user/username/projects/myproject/packages/pkg1/tsconfig.json'...
+
+Found 'package.json' at '/user/username/projects/myproject/packages/pkg1/package.json'.
+'package.json' does not have a 'typesVersions' field.
+======== Resolving module 'pkg2' from '/user/username/projects/myproject/packages/pkg1/index.ts'. ========
+Module resolution kind is not specified, using 'Node12'.
+Loading module 'pkg2' from 'node_modules' folder, target file type 'TypeScript'.
+Directory '/user/username/projects/myproject/packages/pkg1/node_modules' does not exist, skipping all lookups in it.
+Directory '/user/username/projects/myproject/packages/node_modules' does not exist, skipping all lookups in it.
+Found 'package.json' at '/user/username/projects/myproject/node_modules/pkg2/package.json'.
+'package.json' does not have a 'typesVersions' field.
+File '/user/username/projects/myproject/node_modules/pkg2.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2.d.ts' does not exist.
+'package.json' does not have a 'typings' field.
+'package.json' does not have a 'types' field.
+'package.json' has 'main' field 'build/index.js' that references '/user/username/projects/myproject/node_modules/pkg2/build/index.js'.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js' exist - use it as a name resolution result.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js' has an unsupported extension, so skipping it.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/node_modules/pkg2/build/index.js', target file type 'TypeScript'.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.js.d.ts' does not exist.
+File name '/user/username/projects/myproject/node_modules/pkg2/build/index.js' has a '.js' extension - stripping it.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.ts' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.tsx' does not exist.
+File '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts' exist - use it as a name resolution result.
+Resolving real path for '/user/username/projects/myproject/node_modules/pkg2/build/index.d.ts', result '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'.
+======== Module name 'pkg2' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/index.d.ts' with Package ID 'pkg2/build/index.d.ts@1.0.0'. ========
+File '/user/username/projects/myproject/packages/pkg2/build/package.json' does not exist.
+Found 'package.json' at '/user/username/projects/myproject/packages/pkg2/package.json'.
+'package.json' does not have a 'typesVersions' field.
+======== Resolving module './const.cjs' from '/user/username/projects/myproject/packages/pkg2/build/index.d.ts'. ========
+Using compiler options of project reference redirect '/user/username/projects/myproject/packages/pkg2/tsconfig.json'.
+Module resolution kind is not specified, using 'Node12'.
+Loading module as file / folder, candidate module location '/user/username/projects/myproject/packages/pkg2/build/const.cjs', target file type 'TypeScript'.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.ts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.tsx' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cjs.d.ts' does not exist.
+File name '/user/username/projects/myproject/packages/pkg2/build/const.cjs' has a '.cjs' extension - stripping it.
+File '/user/username/projects/myproject/packages/pkg2/build/const.cts' does not exist.
+File '/user/username/projects/myproject/packages/pkg2/build/const.d.cts' exist - use it as a name resolution result.
+======== Module name './const.cjs' was successfully resolved to '/user/username/projects/myproject/packages/pkg2/build/const.d.cts'. ========
+File '/a/lib/package.json' does not exist.
+File '/a/package.json' does not exist.
+File '/package.json' does not exist.
+packages/pkg1/index.ts:1:29 - error TS1445: Module 'pkg2' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+
+1 import type { TheNum } from 'pkg2'
+                              ~~~~~~
+
+[12:01:31 AM] Found 1 error. Watching for file changes.
+
+
+
+Program root files: ["/user/username/projects/myproject/packages/pkg1/index.ts"]
+Program options: {"outDir":"/user/username/projects/myproject/packages/pkg1/build","module":100,"watch":true,"traceResolution":true,"configFilePath":"/user/username/projects/myproject/packages/pkg1/tsconfig.json"}
+Program structureReused: Not
+Program files::
+/a/lib/lib.es2020.full.d.ts
+/user/username/projects/myproject/packages/pkg2/build/index.d.ts
+/user/username/projects/myproject/packages/pkg1/index.ts
+
+Semantic diagnostics in builder refreshed for::
+/user/username/projects/myproject/packages/pkg1/index.ts
+
+Shape signatures in builder refreshed for::
+/user/username/projects/myproject/packages/pkg1/index.ts (computed .d.ts)
 
 WatchedFiles::
 /user/username/projects/myproject/packages/pkg2/tsconfig.json:
@@ -337,12 +594,26 @@ WatchedFiles::
   {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg2/index.ts:
   {"fileName":"/user/username/projects/myproject/packages/pkg2/index.ts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/a/lib/package.json:
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+/a/package.json:
+  {"fileName":"/a/package.json","pollingInterval":250}
+  {"fileName":"/a/package.json","pollingInterval":250}
+/package.json:
+  {"fileName":"/package.json","pollingInterval":250}
+  {"fileName":"/package.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/tsconfig.json:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/index.ts:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
-/user/username/projects/myproject/packages/pkg2/package.json:
-  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/build/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/build/package.json","pollingInterval":250}
 
 FsWatches::
 
@@ -358,7 +629,9 @@ exitCode:: ExitStatus.undefined
 Change:: removes those errors when a package file is changed to cjs extensions
 
 Input::
-//// [/user/username/projects/myproject/packages/pkg2/package.json] file written with same contents
+//// [/user/username/projects/myproject/packages/pkg2/package.json]
+{"name":"pkg2","version":"1.0.0","main":"build/index.cjs","type":"module"}
+
 //// [/user/username/projects/myproject/packages/pkg2/index.cts]
 export type { TheNum } from './const.cjs';
 
@@ -366,11 +639,11 @@ export type { TheNum } from './const.cjs';
 
 Output::
 >> Screen clear
-[12:01:23 AM] File change detected. Starting incremental compilation...
+[12:01:38 AM] File change detected. Starting incremental compilation...
 
-[12:01:24 AM] Project 'packages/pkg2/tsconfig.json' is out of date because oldest output 'packages/pkg2/build/const.cjs' is older than newest input 'packages/pkg2/index.cts'
+[12:01:39 AM] Project 'packages/pkg2/tsconfig.json' is out of date because oldest output 'packages/pkg2/build/const.cjs' is older than newest input 'packages/pkg2/index.cts'
 
-[12:01:25 AM] Building project '/user/username/projects/myproject/packages/pkg2/tsconfig.json'...
+[12:01:40 AM] Building project '/user/username/projects/myproject/packages/pkg2/tsconfig.json'...
 
 ======== Resolving module './const.cjs' from '/user/username/projects/myproject/packages/pkg2/index.cts'. ========
 Module resolution kind is not specified, using 'Node12'.
@@ -384,7 +657,7 @@ File '/user/username/projects/myproject/packages/pkg2/const.cts' exist - use it
 File '/a/lib/package.json' does not exist.
 File '/a/package.json' does not exist.
 File '/package.json' does not exist.
-[12:01:34 AM] Updating unchanged output timestamps of project '/user/username/projects/myproject/packages/pkg2/tsconfig.json'...
+[12:01:49 AM] Updating unchanged output timestamps of project '/user/username/projects/myproject/packages/pkg2/tsconfig.json'...
 
 
 
@@ -407,12 +680,26 @@ WatchedFiles::
   {"fileName":"/user/username/projects/myproject/packages/pkg2/tsconfig.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg2/const.cts:
   {"fileName":"/user/username/projects/myproject/packages/pkg2/const.cts","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/a/lib/package.json:
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+  {"fileName":"/a/lib/package.json","pollingInterval":250}
+/a/package.json:
+  {"fileName":"/a/package.json","pollingInterval":250}
+  {"fileName":"/a/package.json","pollingInterval":250}
+/package.json:
+  {"fileName":"/package.json","pollingInterval":250}
+  {"fileName":"/package.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/tsconfig.json:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/tsconfig.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg1/index.ts:
   {"fileName":"/user/username/projects/myproject/packages/pkg1/index.ts","pollingInterval":250}
-/user/username/projects/myproject/packages/pkg2/package.json:
-  {"fileName":"/user/username/projects/myproject/packages/pkg2/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg1/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg1/package.json","pollingInterval":250}
+/user/username/projects/myproject/packages/pkg2/build/package.json:
+  {"fileName":"/user/username/projects/myproject/packages/pkg2/build/package.json","pollingInterval":250}
 /user/username/projects/myproject/packages/pkg2/index.cts:
   {"fileName":"/user/username/projects/myproject/packages/pkg2/index.cts","pollingInterval":250}
 
@@ -429,7 +716,7 @@ exitCode:: ExitStatus.undefined
 //// [/user/username/projects/myproject/packages/pkg2/build/const.cjs] file changed its modified time
 //// [/user/username/projects/myproject/packages/pkg2/build/const.d.cts] file changed its modified time
 //// [/user/username/projects/myproject/packages/pkg2/build/tsconfig.tsbuildinfo]
-{"program":{"fileNames":["../../../../../../../a/lib/lib.es2020.full.d.ts","../const.cts","../index.cts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true},"-11202312776-export type TheNum = 42;",{"version":"-9668872159-export type { TheNum } from './const.cjs';","signature":"-9835135925-export type { TheNum } from './const.cjs';\n"}],"options":{"composite":true,"module":100,"outDir":"./"},"fileIdsList":[[2]],"referencedMap":[[3,1]],"exportedModulesMap":[[3,1]],"semanticDiagnosticsPerFile":[1,2,3]},"version":"FakeTSVersion"}
+{"program":{"fileNames":["../../../../../../../a/lib/lib.es2020.full.d.ts","../const.cts","../index.cts"],"fileInfos":[{"version":"-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }","affectsGlobalScope":true,"impliedFormat":1},"-11202312776-export type TheNum = 42;",{"version":"-9668872159-export type { TheNum } from './const.cjs';","signature":"-9835135925-export type { TheNum } from './const.cjs';\n","impliedFormat":1}],"options":{"composite":true,"module":100,"outDir":"./"},"fileIdsList":[[2]],"referencedMap":[[3,1]],"exportedModulesMap":[[3,1]],"semanticDiagnosticsPerFile":[1,2,3]},"version":"FakeTSVersion"}
 
 //// [/user/username/projects/myproject/packages/pkg2/build/tsconfig.tsbuildinfo.readable.baseline.txt]
 {
@@ -448,7 +735,8 @@ exitCode:: ExitStatus.undefined
       "../../../../../../../a/lib/lib.es2020.full.d.ts": {
         "version": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
         "signature": "-7698705165-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }",
-        "affectsGlobalScope": true
+        "affectsGlobalScope": true,
+        "impliedFormat": 1
       },
       "../const.cts": {
         "version": "-11202312776-export type TheNum = 42;",
@@ -456,7 +744,8 @@ exitCode:: ExitStatus.undefined
       },
       "../index.cts": {
         "version": "-9668872159-export type { TheNum } from './const.cjs';",
-        "signature": "-9835135925-export type { TheNum } from './const.cjs';\n"
+        "signature": "-9835135925-export type { TheNum } from './const.cjs';\n",
+        "impliedFormat": 1
       }
     },
     "options": {
@@ -481,7 +770,7 @@ exitCode:: ExitStatus.undefined
     ]
   },
   "version": "FakeTSVersion",
-  "size": 892
+  "size": 928
 }
 
 //// [/user/username/projects/myproject/packages/pkg2/build/index.cjs]

From b12315f05de78eb6b2bf8f46325933454ebdb02a Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Wed, 1 Sep 2021 11:12:33 -0700
Subject: [PATCH 6/9] Minor PR feedback

---
 src/compiler/commandLineParser.ts |  6 +++---
 src/compiler/emitter.ts           | 21 +++++----------------
 src/compiler/program.ts           |  2 +-
 src/compiler/utilities.ts         | 10 +++++-----
 src/services/stringCompletions.ts |  2 +-
 5 files changed, 15 insertions(+), 26 deletions(-)

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 8762416d91d60..37f27b76a42e4 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -3201,7 +3201,7 @@ namespace ts {
         // Rather than re-query this for each file and filespec, we query the supported extensions
         // once and store it on the expansion context.
         const supportedExtensions = getSupportedExtensions(options, extraFileExtensions);
-        const supportedExtensionsWithJsonIfResolveJsonModule = getSuppoertedExtensionsWithJsonIfResolveJsonModule(options, supportedExtensions);
+        const supportedExtensionsWithJsonIfResolveJsonModule = getSupportedExtensionsWithJsonIfResolveJsonModule(options, supportedExtensions);
 
         // Literal files are always included verbatim. An "include" or "exclude" specification cannot
         // remove a literal file.
@@ -3447,7 +3447,7 @@ namespace ts {
         }
         for (const ext of extensionGroup) {
             if (fileExtensionIs(file, ext)) {
-                break;
+                return false;
             }
             const higherPriorityPath = keyMapper(changeExtension(file, ext));
             if (literalFiles.has(higherPriorityPath) || wildcardFiles.has(higherPriorityPath)) {
@@ -3478,7 +3478,7 @@ namespace ts {
         for (let i = extensionGroup.length - 1; i >= 0; i--) {
             const ext = extensionGroup[i];
             if (fileExtensionIs(file, ext)) {
-                break;
+                return;
             }
             const lowerPriorityPath = keyMapper(changeExtension(file, ext));
             wildcardFiles.delete(lowerPriorityPath);
diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index 943dd14836e78..f8357b57394bd 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -108,22 +108,11 @@ namespace ts {
 
     /* @internal */
     export function getOutputExtension(fileName: string, options: CompilerOptions): Extension {
-        if (fileExtensionIs(fileName, Extension.Json)) {
-            return Extension.Json;
-        }
-
-        if (options.jsx === JsxEmit.Preserve) {
-            if (fileExtensionIsOneOf(fileName, [Extension.Jsx, Extension.Tsx])) {
-                return Extension.Jsx;
-            }
-        }
-        if (fileExtensionIsOneOf(fileName, [Extension.Mts, Extension.Mjs])) {
-            return Extension.Mjs;
-        }
-        if (fileExtensionIsOneOf(fileName, [Extension.Cts, Extension.Cjs])) {
-            return Extension.Cjs;
-        }
-        return Extension.Js;
+        return fileExtensionIs(fileName, Extension.Json) ? Extension.Json :
+        options.jsx === JsxEmit.Preserve && fileExtensionIsOneOf(fileName, [Extension.Jsx, Extension.Tsx]) ? Extension.Jsx :
+        fileExtensionIsOneOf(fileName, [Extension.Mts, Extension.Mjs]) ? Extension.Mjs :
+        fileExtensionIsOneOf(fileName, [Extension.Cts, Extension.Cjs]) ? Extension.Cjs :
+        Extension.Js;
     }
 
     function getOutputPathWithoutChangingExt(inputFileName: string, configFile: ParsedCommandLine, ignoreCase: boolean, outputDir: string | undefined, getCommonSourceDirectory?: () => string) {
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index 2db7b08f86b20..17de23668d22d 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -883,7 +883,7 @@ namespace ts {
         const programDiagnostics = createDiagnosticCollection();
         const currentDirectory = host.getCurrentDirectory();
         const supportedExtensions = getSupportedExtensions(options);
-        const supportedExtensionsWithJsonIfResolveJsonModule = getSuppoertedExtensionsWithJsonIfResolveJsonModule(options, supportedExtensions);
+        const supportedExtensionsWithJsonIfResolveJsonModule = getSupportedExtensionsWithJsonIfResolveJsonModule(options, supportedExtensions);
 
         // Map storing if there is emit blocking diagnostics for given input
         const hasEmitBlockingDiagnostics = new Map<string, boolean>();
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index a700a98e5a4c1..627c0f8eb9b90 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -6738,7 +6738,7 @@ namespace ts {
     }
 
     /**
-     *  List of supported extensions in order of file resolution precedence.
+     *  Groups of supported extensions in order of file resolution precedence. (eg, TS > TSX > DTS and seperately, CTS > DCTS)
      */
     export const supportedTSExtensions: readonly Extension[][] = [[Extension.Ts, Extension.Tsx, Extension.Dts], [Extension.Cts, Extension.Dcts], [Extension.Mts, Extension.Dmts]];
     export const supportedTSExtensionsFlat: readonly Extension[] = flatten(supportedTSExtensions);
@@ -6769,9 +6769,9 @@ namespace ts {
         return extensions;
     }
 
-    export function getSuppoertedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly Extension[][]): readonly Extension[][];
-    export function getSuppoertedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly string[][]): readonly string[][];
-    export function getSuppoertedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly string[][]): readonly string[][] {
+    export function getSupportedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly Extension[][]): readonly Extension[][];
+    export function getSupportedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly string[][]): readonly string[][];
+    export function getSupportedExtensionsWithJsonIfResolveJsonModule(options: CompilerOptions | undefined, supportedExtensions: readonly string[][]): readonly string[][] {
         if (!options || !options.resolveJsonModule) return supportedExtensions;
         if (supportedExtensions === allSupportedExtensions) return allSupportedExtensionsWithJson;
         if (supportedExtensions === supportedTSExtensions) return supportedTSExtensionsWithJson;
@@ -6794,7 +6794,7 @@ namespace ts {
         if (!fileName) return false;
 
         const supportedExtensions = getSupportedExtensions(compilerOptions, extraFileExtensions);
-        for (const extension of flatten(getSuppoertedExtensionsWithJsonIfResolveJsonModule(compilerOptions, supportedExtensions))) {
+        for (const extension of flatten(getSupportedExtensionsWithJsonIfResolveJsonModule(compilerOptions, supportedExtensions))) {
             if (fileExtensionIs(fileName, extension)) {
                 return true;
             }
diff --git a/src/services/stringCompletions.ts b/src/services/stringCompletions.ts
index f3c04d9ac8b82..cc81c6ab97f0e 100644
--- a/src/services/stringCompletions.ts
+++ b/src/services/stringCompletions.ts
@@ -347,7 +347,7 @@ namespace ts.Completions.StringCompletions {
     function getSupportedExtensionsForModuleResolution(compilerOptions: CompilerOptions): readonly Extension[][] {
         const extensions = getSupportedExtensions(compilerOptions);
         return getEmitModuleResolutionKind(compilerOptions) === ModuleResolutionKind.NodeJs ?
-            getSuppoertedExtensionsWithJsonIfResolveJsonModule(compilerOptions, extensions) :
+            getSupportedExtensionsWithJsonIfResolveJsonModule(compilerOptions, extensions) :
             extensions;
     }
 

From 15e1904fd7343a28486785ef63768d1f967c008a Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Wed, 1 Sep 2021 11:22:40 -0700
Subject: [PATCH 7/9] Adjust error message

---
 src/compiler/checker.ts                       |  4 +-
 src/compiler/diagnosticMessages.json          |  4 +-
 ...esForbidenSyntax(module=node12).errors.txt | 96 +++++++++----------
 ...ForbidenSyntax(module=nodenext).errors.txt | 96 +++++++++----------
 4 files changed, 100 insertions(+), 100 deletions(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 1fc9416faf634..44e02840e046b 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -30560,7 +30560,7 @@ namespace ts {
             if (node.kind === SyntaxKind.TypeAssertionExpression) {
                 const file = getSourceFileOfNode(node);
                 if (file && fileExtensionIsOneOf(file.fileName, [Extension.Cts, Extension.Mts])) {
-                    grammarErrorOnNode(node, Diagnostics.This_syntax_is_reserved_in_files_with_this_extension_Use_an_as_expression_instead);
+                    grammarErrorOnNode(node, Diagnostics.This_syntax_is_reserved_in_files_with_the_mts_or_cts_extension_Use_an_as_expression_instead);
                 }
             }
             return checkAssertionWorker(node, node.type, node.expression);
@@ -41806,7 +41806,7 @@ namespace ts {
 
             if (node.typeParameters && !(length(node.typeParameters) > 1 || node.typeParameters.hasTrailingComma || node.typeParameters[0].constraint)) {
                 if (file && fileExtensionIsOneOf(file.fileName, [Extension.Mts, Extension.Cts])) {
-                    grammarErrorOnNode(node.typeParameters[0], Diagnostics.This_syntax_is_reserved_in_files_with_this_extension_Add_a_trailing_comma_or_explicit_constraint);
+                    grammarErrorOnNode(node.typeParameters[0], Diagnostics.This_syntax_is_reserved_in_files_with_the_mts_or_cts_extension_Add_a_trailing_comma_or_explicit_constraint);
                 }
             }
 
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index ca529d2e29539..66da25d3ec66a 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -5888,11 +5888,11 @@
         "category": "Error",
         "code": 7058
     },
-    "This syntax is reserved in files with this extension. Use an `as` expression instead.": {
+    "This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.": {
         "category": "Error",
         "code": 7059
     },
-    "This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.": {
+    "This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.": {
         "category": "Error",
         "code": 7060
     },
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).errors.txt b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).errors.txt
index cf09fc77b2f5a..984483a332e29 100644
--- a/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).errors.txt
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=node12).errors.txt
@@ -1,27 +1,27 @@
-tests/cases/conformance/node/index.cts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/index.cts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/index.cts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/index.mts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/index.mts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/index.mts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder/index.cts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder/index.cts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder/index.cts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder/index.mts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder/index.mts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder/index.mts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/another/index.cts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder2/another/index.cts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/another/index.cts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/another/index.mts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder2/another/index.mts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/another/index.mts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/index.cts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder2/index.cts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/index.cts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/index.mts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder2/index.mts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.cts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/index.cts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.cts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.mts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/index.mts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.mts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.cts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder/index.cts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.cts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.mts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder/index.mts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.mts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.cts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/index.cts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.cts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.mts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/index.mts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
 
 
 ==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
@@ -32,21 +32,21 @@ tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This synt
     // cjs format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder/index.mts (3 errors) ====
     // esm format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder2/index.ts (0 errors) ====
     // cjs format file
@@ -56,21 +56,21 @@ tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This synt
     // cjs format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder2/index.mts (3 errors) ====
     // esm format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder2/another/index.ts (0 errors) ====
     // esm format file
@@ -80,41 +80,41 @@ tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This synt
     // esm format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder2/another/index.cts (3 errors) ====
     // cjs format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/index.mts (3 errors) ====
     // esm format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/index.cts (3 errors) ====
     // cjs format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/index.ts (0 errors) ====
     // esm format file
diff --git a/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).errors.txt
index cf09fc77b2f5a..984483a332e29 100644
--- a/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).errors.txt
+++ b/tests/baselines/reference/nodeModulesForbidenSyntax(module=nodenext).errors.txt
@@ -1,27 +1,27 @@
-tests/cases/conformance/node/index.cts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/index.cts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/index.cts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/index.mts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/index.mts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/index.mts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder/index.cts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder/index.cts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder/index.cts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder/index.mts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder/index.mts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder/index.mts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/another/index.cts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder2/another/index.cts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/another/index.cts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/another/index.mts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder2/another/index.mts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/another/index.mts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/index.cts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder2/index.cts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/index.cts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/index.mts(2,12): error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
-tests/cases/conformance/node/subfolder2/index.mts(2,20): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
-tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.cts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/index.cts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.cts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.mts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/index.mts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/index.mts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.cts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder/index.cts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.cts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.mts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder/index.mts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder/index.mts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.cts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/another/index.mts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.cts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/index.cts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.cts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.mts(2,12): error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
+tests/cases/conformance/node/subfolder2/index.mts(2,20): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
+tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
 
 
 ==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
@@ -32,21 +32,21 @@ tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This synt
     // cjs format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder/index.mts (3 errors) ====
     // esm format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder2/index.ts (0 errors) ====
     // cjs format file
@@ -56,21 +56,21 @@ tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This synt
     // cjs format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder2/index.mts (3 errors) ====
     // esm format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder2/another/index.ts (0 errors) ====
     // esm format file
@@ -80,41 +80,41 @@ tests/cases/conformance/node/subfolder2/index.mts(2,23): error TS7059: This synt
     // esm format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/subfolder2/another/index.cts (3 errors) ====
     // cjs format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/index.mts (3 errors) ====
     // esm format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/index.cts (3 errors) ====
     // cjs format file
     const x = <T>() => <T><any>(void 0);
                ~
-!!! error TS7060: This syntax is reserved in files with this extension. Add a trailing comma or explicit constraint.
+!!! error TS7060: This syntax is reserved in files with the .mts or .cts extension. Add a trailing comma or explicit constraint.
                        ~~~~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
                           ~~~~~~~~~~~~~
-!!! error TS7059: This syntax is reserved in files with this extension. Use an `as` expression instead.
+!!! error TS7059: This syntax is reserved in files with the .mts or .cts extension. Use an `as` expression instead.
     export {x};
 ==== tests/cases/conformance/node/index.ts (0 errors) ====
     // esm format file

From 5bf44ac87b3e6998cf6e5c6dc0c9637a9d4c4ea7 Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wwigham@gmail.com>
Date: Tue, 14 Sep 2021 19:38:07 -0700
Subject: [PATCH 8/9] Accept new error codes

---
 .../nodeModules1(module=node12).errors.txt    | 24 +++++++++----------
 .../nodeModules1(module=nodenext).errors.txt  | 24 +++++++++----------
 ...eModulesAllowJs1(module=node12).errors.txt | 24 +++++++++----------
 ...odulesAllowJs1(module=nodenext).errors.txt | 24 +++++++++----------
 ...t-correctly-with-cts-and-mts-extensions.js |  4 ++--
 5 files changed, 50 insertions(+), 50 deletions(-)

diff --git a/tests/baselines/reference/nodeModules1(module=node12).errors.txt b/tests/baselines/reference/nodeModules1(module=node12).errors.txt
index 72fc62c6aed5f..a2f68a704a96f 100644
--- a/tests/baselines/reference/nodeModules1(module=node12).errors.txt
+++ b/tests/baselines/reference/nodeModules1(module=node12).errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/node/index.cts(2,21): error TS1445: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(3,21): error TS1445: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(6,21): error TS1445: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(9,21): error TS1445: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(11,22): error TS1445: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(12,22): error TS1445: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(2,21): error TS1471: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(3,21): error TS1471: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(6,21): error TS1471: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(9,21): error TS1471: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(11,22): error TS1471: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(12,22): error TS1471: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
 
 
 ==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
@@ -74,27 +74,27 @@ tests/cases/conformance/node/index.cts(12,22): error TS1445: Module './subfolder
     // ESM-format imports below should issue errors
     import * as m1 from "./index.js";
                         ~~~~~~~~~~~~
-!!! error TS1445: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m2 from "./index.mjs";
                         ~~~~~~~~~~~~~
-!!! error TS1445: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m3 from "./index.cjs";
     import * as m4 from "./subfolder/index.js";
     import * as m5 from "./subfolder/index.mjs";
                         ~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m6 from "./subfolder/index.cjs";
     import * as m7 from "./subfolder2/index.js";
     import * as m8 from "./subfolder2/index.mjs";
                         ~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m9 from "./subfolder2/index.cjs";
     import * as m10 from "./subfolder2/another/index.js";
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m11 from "./subfolder2/another/index.mjs";
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m12 from "./subfolder2/another/index.cjs";
     void m1;
     void m2;
diff --git a/tests/baselines/reference/nodeModules1(module=nodenext).errors.txt b/tests/baselines/reference/nodeModules1(module=nodenext).errors.txt
index 72fc62c6aed5f..a2f68a704a96f 100644
--- a/tests/baselines/reference/nodeModules1(module=nodenext).errors.txt
+++ b/tests/baselines/reference/nodeModules1(module=nodenext).errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/node/index.cts(2,21): error TS1445: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(3,21): error TS1445: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(6,21): error TS1445: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(9,21): error TS1445: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(11,22): error TS1445: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/index.cts(12,22): error TS1445: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(2,21): error TS1471: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(3,21): error TS1471: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(6,21): error TS1471: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(9,21): error TS1471: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(11,22): error TS1471: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/index.cts(12,22): error TS1471: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
 
 
 ==== tests/cases/conformance/node/subfolder/index.ts (0 errors) ====
@@ -74,27 +74,27 @@ tests/cases/conformance/node/index.cts(12,22): error TS1445: Module './subfolder
     // ESM-format imports below should issue errors
     import * as m1 from "./index.js";
                         ~~~~~~~~~~~~
-!!! error TS1445: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m2 from "./index.mjs";
                         ~~~~~~~~~~~~~
-!!! error TS1445: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m3 from "./index.cjs";
     import * as m4 from "./subfolder/index.js";
     import * as m5 from "./subfolder/index.mjs";
                         ~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m6 from "./subfolder/index.cjs";
     import * as m7 from "./subfolder2/index.js";
     import * as m8 from "./subfolder2/index.mjs";
                         ~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m9 from "./subfolder2/index.cjs";
     import * as m10 from "./subfolder2/another/index.js";
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m11 from "./subfolder2/another/index.mjs";
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m12 from "./subfolder2/another/index.cjs";
     void m1;
     void m2;
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).errors.txt b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).errors.txt
index 41443989a961d..365b00a0e162f 100644
--- a/tests/baselines/reference/nodeModulesAllowJs1(module=node12).errors.txt
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=node12).errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/node/allowJs/index.cjs(2,21): error TS1445: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(3,21): error TS1445: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(6,21): error TS1445: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(9,21): error TS1445: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(11,22): error TS1445: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(12,22): error TS1445: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(2,21): error TS1471: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(3,21): error TS1471: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(6,21): error TS1471: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(9,21): error TS1471: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(11,22): error TS1471: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(12,22): error TS1471: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
 
 
 ==== tests/cases/conformance/node/allowJs/subfolder/index.js (0 errors) ====
@@ -74,27 +74,27 @@ tests/cases/conformance/node/allowJs/index.cjs(12,22): error TS1445: Module './s
     // ESM format imports below should error
     import * as m1 from "./index.js";
                         ~~~~~~~~~~~~
-!!! error TS1445: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m2 from "./index.mjs";
                         ~~~~~~~~~~~~~
-!!! error TS1445: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m3 from "./index.cjs";
     import * as m4 from "./subfolder/index.js";
     import * as m5 from "./subfolder/index.mjs";
                         ~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m6 from "./subfolder/index.cjs";
     import * as m7 from "./subfolder2/index.js";
     import * as m8 from "./subfolder2/index.mjs";
                         ~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m9 from "./subfolder2/index.cjs";
     import * as m10 from "./subfolder2/another/index.js";
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m11 from "./subfolder2/another/index.mjs";
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m12 from "./subfolder2/another/index.cjs";
     void m1;
     void m2;
diff --git a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).errors.txt b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).errors.txt
index 41443989a961d..365b00a0e162f 100644
--- a/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).errors.txt
+++ b/tests/baselines/reference/nodeModulesAllowJs1(module=nodenext).errors.txt
@@ -1,9 +1,9 @@
-tests/cases/conformance/node/allowJs/index.cjs(2,21): error TS1445: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(3,21): error TS1445: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(6,21): error TS1445: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(9,21): error TS1445: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(11,22): error TS1445: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
-tests/cases/conformance/node/allowJs/index.cjs(12,22): error TS1445: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(2,21): error TS1471: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(3,21): error TS1471: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(6,21): error TS1471: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(9,21): error TS1471: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(11,22): error TS1471: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+tests/cases/conformance/node/allowJs/index.cjs(12,22): error TS1471: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
 
 
 ==== tests/cases/conformance/node/allowJs/subfolder/index.js (0 errors) ====
@@ -74,27 +74,27 @@ tests/cases/conformance/node/allowJs/index.cjs(12,22): error TS1445: Module './s
     // ESM format imports below should error
     import * as m1 from "./index.js";
                         ~~~~~~~~~~~~
-!!! error TS1445: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m2 from "./index.mjs";
                         ~~~~~~~~~~~~~
-!!! error TS1445: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m3 from "./index.cjs";
     import * as m4 from "./subfolder/index.js";
     import * as m5 from "./subfolder/index.mjs";
                         ~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m6 from "./subfolder/index.cjs";
     import * as m7 from "./subfolder2/index.js";
     import * as m8 from "./subfolder2/index.mjs";
                         ~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m9 from "./subfolder2/index.cjs";
     import * as m10 from "./subfolder2/another/index.js";
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/another/index.js' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m11 from "./subfolder2/another/index.mjs";
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1445: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+!!! error TS1471: Module './subfolder2/another/index.mjs' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
     import * as m12 from "./subfolder2/another/index.cjs";
     void m1;
     void m2;
diff --git a/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js b/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js
index 1a445f232047e..6a2a409b814cf 100644
--- a/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js
+++ b/tests/baselines/reference/tsbuild/watchMode/moduleResolution/resolves-specifier-in-output-declaration-file-from-referenced-project-correctly-with-cts-and-mts-extensions.js
@@ -326,7 +326,7 @@ File '/user/username/projects/myproject/packages/pkg2/build/const.d.cts' exist -
 File '/a/lib/package.json' does not exist.
 File '/a/package.json' does not exist.
 File '/package.json' does not exist.
-packages/pkg1/index.ts:1:29 - error TS1445: Module 'pkg2' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+packages/pkg1/index.ts:1:29 - error TS1471: Module 'pkg2' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
 
 1 import type { TheNum } from 'pkg2'
                               ~~~~~~
@@ -564,7 +564,7 @@ File '/user/username/projects/myproject/packages/pkg2/build/const.d.cts' exist -
 File '/a/lib/package.json' does not exist.
 File '/a/package.json' does not exist.
 File '/package.json' does not exist.
-packages/pkg1/index.ts:1:29 - error TS1445: Module 'pkg2' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
+packages/pkg1/index.ts:1:29 - error TS1471: Module 'pkg2' cannot be imported using this construct. The specifier only resolves to an es module, which cannot be imported synchronously. Use dynamic import instead.
 
 1 import type { TheNum } from 'pkg2'
                               ~~~~~~

From 21b73e82ef8b1b07086e415b195b5f707a6d557b Mon Sep 17 00:00:00 2001
From: Wesley Wigham <wewigham@microsoft.com>
Date: Mon, 20 Sep 2021 19:09:36 -0700
Subject: [PATCH 9/9] Accept updated baseline

---
 ...importAssertion1(module=es2015).errors.txt | 36 +++++++++----------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/tests/baselines/reference/importAssertion1(module=es2015).errors.txt b/tests/baselines/reference/importAssertion1(module=es2015).errors.txt
index f9603006232bb..12775e5e5807b 100644
--- a/tests/baselines/reference/importAssertion1(module=es2015).errors.txt
+++ b/tests/baselines/reference/importAssertion1(module=es2015).errors.txt
@@ -3,15 +3,15 @@ tests/cases/conformance/importAssertion/1.ts(2,28): error TS2821: Import asserti
 tests/cases/conformance/importAssertion/1.ts(3,28): error TS2821: Import assertions are only supported when the '--module' option is set to 'esnext'.
 tests/cases/conformance/importAssertion/2.ts(1,28): error TS2821: Import assertions are only supported when the '--module' option is set to 'esnext'.
 tests/cases/conformance/importAssertion/2.ts(2,38): error TS2821: Import assertions are only supported when the '--module' option is set to 'esnext'.
-tests/cases/conformance/importAssertion/3.ts(1,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/importAssertion/3.ts(2,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/importAssertion/3.ts(3,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/importAssertion/3.ts(4,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/importAssertion/3.ts(5,12): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/importAssertion/3.ts(7,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/importAssertion/3.ts(8,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/importAssertion/3.ts(9,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
-tests/cases/conformance/importAssertion/3.ts(10,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+tests/cases/conformance/importAssertion/3.ts(1,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/importAssertion/3.ts(2,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/importAssertion/3.ts(3,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/importAssertion/3.ts(4,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/importAssertion/3.ts(5,12): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/importAssertion/3.ts(7,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/importAssertion/3.ts(8,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/importAssertion/3.ts(9,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
+tests/cases/conformance/importAssertion/3.ts(10,11): error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
 
 
 ==== tests/cases/conformance/importAssertion/0.ts (0 errors) ====
@@ -48,31 +48,31 @@ tests/cases/conformance/importAssertion/3.ts(10,11): error TS1323: Dynamic impor
 ==== tests/cases/conformance/importAssertion/3.ts (9 errors) ====
     const a = import('./0')
               ~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     const b = import('./0', { assert: { type: "json" } })
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     const c = import('./0', { assert: { type: "json", ttype: "typo" } })
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     const d = import('./0', { assert: {} })
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     const dd = import('./0', {})
                ~~~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     declare function foo(): any;
     const e = import('./0', foo())
               ~~~~~~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     const f = import()
               ~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     const g = import('./0', {}, {})
               ~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     const h = import('./0', { assert: { type: "json" }},)
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', or 'umd'.
+!!! error TS1323: Dynamic imports are only supported when the '--module' flag is set to 'es2020', 'esnext', 'commonjs', 'amd', 'system', 'umd', 'node12', or 'nodenext'.
     
     
\ No newline at end of file