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resolver.go
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package module
import (
"fmt"
"slices"
"strings"
"github.com/microsoft/typescript-go/internal/ast"
"github.com/microsoft/typescript-go/internal/collections"
"github.com/microsoft/typescript-go/internal/compiler/diagnostics"
"github.com/microsoft/typescript-go/internal/compiler/packagejson"
"github.com/microsoft/typescript-go/internal/core"
"github.com/microsoft/typescript-go/internal/semver"
"github.com/microsoft/typescript-go/internal/tspath"
)
type resolved struct {
path string
extension string
packageId PackageId
originalPath string
resolvedUsingTsExtension bool
}
func (r *resolved) shouldContinueSearching() bool {
return r == nil
}
func (r *resolved) isResolved() bool {
return r != nil && r.path != ""
}
func unresolved() *resolved {
return &resolved{}
}
func continueSearching() *resolved {
return nil
}
type resolutionKindSpecificLoader = func(extensions extensions, candidate string, onlyRecordFailures bool) *resolved
type resolutionState struct {
resolver *Resolver
// request fields
name string
containingDirectory string
isConfigLookup bool
features NodeResolutionFeatures
esmMode bool
conditions []string
extensions extensions
compilerOptions *core.CompilerOptions
redirectedReference *ResolvedProjectReference
// state fields
resultFromCache *ResolvedModule
candidateIsFromPackageJsonField bool
resolvedPackageDirectory bool
failedLookupLocations []string
affectingLocations []string
diagnostics []ast.Diagnostic
}
func newResolutionState(
name string,
containingDirectory string,
isTypeReferenceDirective bool,
resolutionMode core.ResolutionMode,
compilerOptions *core.CompilerOptions,
redirectedReference *ResolvedProjectReference,
resolver *Resolver,
) *resolutionState {
state := &resolutionState{
name: name,
containingDirectory: containingDirectory,
compilerOptions: compilerOptions,
resolver: resolver,
}
if redirectedReference != nil {
state.compilerOptions = redirectedReference.CommandLine.CompilerOptions
}
if isTypeReferenceDirective {
state.extensions = extensionsDeclaration
} else if compilerOptions.NoDtsResolution == core.TSTrue {
state.extensions = extensionsImplementationFiles
} else {
state.extensions = extensionsTypeScript | extensionsJavaScript | extensionsDeclaration
}
if !isTypeReferenceDirective && compilerOptions.GetResolveJsonModule() {
state.extensions |= extensionsJson
}
switch compilerOptions.GetModuleResolutionKind() {
case core.ModuleResolutionKindNode16:
state.features = NodeResolutionFeaturesNode16Default
state.esmMode = resolutionMode == core.ModuleKindESNext
state.conditions = getConditions(compilerOptions, resolutionMode)
case core.ModuleResolutionKindNodeNext:
state.features = NodeResolutionFeaturesNodeNextDefault
state.esmMode = resolutionMode == core.ModuleKindESNext
state.conditions = getConditions(compilerOptions, resolutionMode)
case core.ModuleResolutionKindBundler:
state.features = getNodeResolutionFeatures(compilerOptions)
state.conditions = getConditions(compilerOptions, resolutionMode)
}
return state
}
type Resolver struct {
caches
host ResolutionHost
compilerOptions *core.CompilerOptions
// reportDiagnostic: DiagnosticReporter
}
func NewResolver(
host ResolutionHost,
options *core.CompilerOptions,
) *Resolver {
return &Resolver{
host: host,
caches: newCaches(host.GetCurrentDirectory(), host.FS().UseCaseSensitiveFileNames(), options),
compilerOptions: options,
}
}
func (r *Resolver) GetLookupLocationsForResolvedModule(resolvedModule *ResolvedModule) *LookupLocations {
return r.moduleNameCache.getLookupLocations(resolvedModule)
}
func (r *Resolver) GetLookupLocationsForResolvedTypeReferenceDirective(resolvedTypeReferenceDirective *ResolvedTypeReferenceDirective) *LookupLocations {
return r.typeReferenceDirectiveCache.getLookupLocations(resolvedTypeReferenceDirective)
}
func (r *Resolver) traceEnabled() bool {
return r.compilerOptions.TraceResolution == core.TSTrue
}
func (r *Resolver) GetPackageScopeForPath(directory string) *packagejson.InfoCacheEntry {
return (&resolutionState{compilerOptions: r.compilerOptions, resolver: r}).getPackageScopeForPath(directory)
}
func (r *Resolver) GetPackageJsonTypeIfApplicable(path string) string {
if tspath.FileExtensionIsOneOf(path, []string{tspath.ExtensionMts, tspath.ExtensionCts, tspath.ExtensionMjs, tspath.ExtensionCjs}) {
return ""
}
var moduleResolutionKind core.ModuleResolutionKind
if r.compilerOptions != nil {
moduleResolutionKind = r.compilerOptions.GetModuleResolutionKind()
}
var packageJsonType string
shouldLookupFromPackageJson := core.ModuleResolutionKindNode16 <= moduleResolutionKind && moduleResolutionKind <= core.ModuleResolutionKindNodeNext || strings.Contains(path, "/node_modules/")
if shouldLookupFromPackageJson {
packageJsonScope := r.GetPackageScopeForPath(tspath.GetDirectoryPath(path))
if packageJsonScope.Exists() {
packageJsonType, _ = packageJsonScope.Contents.Type.GetValue()
}
}
return packageJsonType
}
func (r *Resolver) ResolveTypeReferenceDirective(typeReferenceDirectiveName string, containingFile string, resolutionMode core.ResolutionMode, redirectedReference *ResolvedProjectReference) *ResolvedTypeReferenceDirective {
traceEnabled := r.traceEnabled()
compilerOptions := r.compilerOptions
if redirectedReference != nil {
compilerOptions = redirectedReference.CommandLine.CompilerOptions
}
containingDirectory := tspath.GetDirectoryPath(containingFile)
result, _ := r.typeReferenceDirectiveCache.getFromDirectoryCache(ModeAwareCacheKey{typeReferenceDirectiveName, resolutionMode}, containingDirectory, redirectedReference)
if result != nil {
if traceEnabled {
r.host.Trace(diagnostics.Resolving_type_reference_directive_0_containing_file_1.Format(typeReferenceDirectiveName, containingFile))
if redirectedReference != nil {
r.host.Trace(diagnostics.Using_compiler_options_of_project_reference_redirect_0.Format(redirectedReference.SourceFile.FileName()))
}
r.host.Trace(diagnostics.Resolution_for_type_reference_directive_0_was_found_in_cache_from_location_1.Format(typeReferenceDirectiveName, containingDirectory))
r.traceTypeReferenceDirectiveResult(typeReferenceDirectiveName, result)
}
return result
}
typeRoots, fromConfig := compilerOptions.GetEffectiveTypeRoots(r.host.GetCurrentDirectory())
if traceEnabled {
r.host.Trace(diagnostics.Resolving_type_reference_directive_0_containing_file_1_root_directory_2.Format(typeReferenceDirectiveName, containingFile, strings.Join(typeRoots, ",")))
if redirectedReference != nil {
r.host.Trace(diagnostics.Using_compiler_options_of_project_reference_redirect_0.Format(redirectedReference.SourceFile.FileName()))
}
}
state := newResolutionState(typeReferenceDirectiveName, containingDirectory, true /*isTypeReferenceDirective*/, resolutionMode, compilerOptions, redirectedReference, r)
result = state.resolveTypeReferenceDirective(typeRoots, fromConfig, strings.HasSuffix(containingFile, InferredTypesContainingFile))
if !r.typeReferenceDirectiveCache.isReadonly {
key := ModeAwareCacheKey{typeReferenceDirectiveName, resolutionMode}
r.typeReferenceDirectiveCache.setInDirectoryCache(key, containingDirectory, result, redirectedReference)
if !tspath.IsExternalModuleNameRelative(typeReferenceDirectiveName) {
r.typeReferenceDirectiveCache.setInNonRelativeNameCache(key, containingDirectory, result, redirectedReference)
}
}
if traceEnabled {
r.traceTypeReferenceDirectiveResult(typeReferenceDirectiveName, result)
}
return result
}
func (r *Resolver) ResolveModuleName(moduleName string, containingFile string, resolutionMode core.ResolutionMode, redirectedReference *ResolvedProjectReference) *ResolvedModule {
traceEnabled := r.traceEnabled()
compilerOptions := r.compilerOptions
if redirectedReference != nil {
compilerOptions = redirectedReference.CommandLine.CompilerOptions
}
if traceEnabled {
r.host.Trace(diagnostics.Resolving_module_0_from_1.Format(moduleName, containingFile))
if redirectedReference != nil {
r.host.Trace(diagnostics.Using_compiler_options_of_project_reference_redirect_0.Format(redirectedReference.SourceFile.FileName()))
}
}
containingDirectory := tspath.GetDirectoryPath(containingFile)
result, _ := r.moduleNameCache.getFromDirectoryCache(ModeAwareCacheKey{moduleName, resolutionMode}, containingDirectory, redirectedReference)
if result != nil {
if traceEnabled {
r.host.Trace(diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1.Format(moduleName, containingDirectory))
}
} else {
moduleResolution := compilerOptions.ModuleResolution
if moduleResolution == core.ModuleResolutionKindUnknown {
moduleResolution = compilerOptions.GetModuleResolutionKind()
if traceEnabled {
r.host.Trace(diagnostics.Module_resolution_kind_is_not_specified_using_0.Format(moduleResolution.String()))
}
} else {
if traceEnabled {
r.host.Trace(diagnostics.Explicitly_specified_module_resolution_kind_Colon_0.Format(moduleResolution.String()))
}
}
switch moduleResolution {
case core.ModuleResolutionKindNode16, core.ModuleResolutionKindNodeNext, core.ModuleResolutionKindBundler:
state := newResolutionState(moduleName, containingDirectory, false /*isTypeReferenceDirective*/, resolutionMode, compilerOptions, redirectedReference, r)
result = state.resolveNodeLike()
default:
panic(fmt.Sprintf("Unexpected moduleResolution: %d", moduleResolution))
}
if !r.moduleNameCache.isReadonly {
key := ModeAwareCacheKey{moduleName, resolutionMode}
r.moduleNameCache.setInDirectoryCache(key, containingDirectory, result, redirectedReference)
if !tspath.IsExternalModuleNameRelative(moduleName) {
r.moduleNameCache.setInNonRelativeNameCache(key, containingDirectory, result, redirectedReference)
}
}
}
if traceEnabled {
if result.IsResolved() {
if result.PackageId.Name != "" {
r.host.Trace(diagnostics.Module_name_0_was_successfully_resolved_to_1_with_Package_ID_2.Format(moduleName, result.ResolvedFileName, result.PackageId.String()))
} else {
r.host.Trace(diagnostics.Module_name_0_was_successfully_resolved_to_1.Format(moduleName, result.ResolvedFileName))
}
} else {
r.host.Trace(diagnostics.Module_name_0_was_not_resolved.Format(moduleName))
}
}
return result
}
func (r *Resolver) resolveConfig(moduleName string, containingFile string) *ResolvedModule {
containingDirectory := tspath.GetDirectoryPath(containingFile)
state := newResolutionState(moduleName, containingDirectory, false /*isTypeReferenceDirective*/, core.ModuleKindCommonJS, r.compilerOptions, nil, r)
state.isConfigLookup = true
state.extensions = extensionsJson
return state.resolveNodeLike()
}
func (r *Resolver) traceTypeReferenceDirectiveResult(typeReferenceDirectiveName string, result *ResolvedTypeReferenceDirective) {
if !result.IsResolved() {
r.host.Trace(diagnostics.Type_reference_directive_0_was_not_resolved.Format(typeReferenceDirectiveName))
} else if result.PackageId.Name != "" {
r.host.Trace(diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_with_Package_ID_2_primary_Colon_3.Format(
typeReferenceDirectiveName,
result.ResolvedFileName,
result.PackageId.String(),
result.Primary,
))
} else {
r.host.Trace(diagnostics.Type_reference_directive_0_was_successfully_resolved_to_1_primary_Colon_2.Format(
typeReferenceDirectiveName,
result.ResolvedFileName,
result.Primary,
))
}
}
func (r *resolutionState) resolveTypeReferenceDirective(typeRoots []string, fromConfig bool, fromInferredTypesContainingFile bool) *ResolvedTypeReferenceDirective {
// Primary lookup
if len(typeRoots) > 0 {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Resolving_with_primary_search_path_0.Format(strings.Join(typeRoots, ", ")))
}
for _, typeRoot := range typeRoots {
candidate := r.getCandidateFromTypeRoot(typeRoot)
directoryExists := r.resolver.host.FS().DirectoryExists(candidate)
if !directoryExists && r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(typeRoot))
}
if fromConfig {
// Custom typeRoots resolve as file or directory just like we do modules
if resolvedFromFile := r.loadModuleFromFile(extensionsDeclaration, candidate, !directoryExists); !resolvedFromFile.shouldContinueSearching() {
packageDirectory := ParseNodeModuleFromPath(resolvedFromFile.path, false)
if packageDirectory != "" {
resolvedFromFile.packageId = r.getPackageId(resolvedFromFile.path, r.getPackageJsonInfo(packageDirectory, false /*onlyRecordFailures*/))
}
return r.createResolvedTypeReferenceDirective(resolvedFromFile, true /*primary*/)
}
}
if resolvedFromDirectory := r.loadNodeModuleFromDirectory(extensionsDeclaration, candidate, !directoryExists, true /*considerPackageJson*/); !resolvedFromDirectory.shouldContinueSearching() {
return r.createResolvedTypeReferenceDirective(resolvedFromDirectory, true /*primary*/)
}
}
} else if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Root_directory_cannot_be_determined_skipping_primary_search_paths.Format())
}
// Secondary lookup
var resolved *resolved
if !fromConfig || !fromInferredTypesContainingFile {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Looking_up_in_node_modules_folder_initial_location_0.Format(r.containingDirectory))
}
if !tspath.IsExternalModuleNameRelative(r.name) {
resolved = r.loadModuleFromNearestNodeModulesDirectory(false /*typesScopeOnly*/)
} else {
candidate := normalizePathForCJSResolution(r.containingDirectory, r.name)
resolved = r.nodeLoadModuleByRelativeName(extensionsDeclaration, candidate, false /*onlyRecordFailures*/, true /*considerPackageJson*/)
}
} else if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Resolving_type_reference_directive_for_program_that_specifies_custom_typeRoots_skipping_lookup_in_node_modules_folder.Format())
}
return r.createResolvedTypeReferenceDirective(resolved, false /*primary*/)
}
func (r *resolutionState) getCandidateFromTypeRoot(typeRoot string) string {
nameForLookup := r.name
if strings.HasSuffix(typeRoot, "/node_modules/@types") || strings.HasSuffix(typeRoot, "/node_modules/@types/") {
nameForLookup = r.mangleScopedPackageName(r.name)
}
return tspath.CombinePaths(typeRoot, nameForLookup)
}
func (r *resolutionState) mangleScopedPackageName(name string) string {
mangled := MangleScopedPackageName(name)
if r.resolver.traceEnabled() && mangled != name {
r.resolver.host.Trace(diagnostics.Scoped_package_detected_looking_in_0.Format(mangled))
}
return mangled
}
func (r *resolutionState) getPackageScopeForPath(directory string) *packagejson.InfoCacheEntry {
result, _ := tspath.ForEachAncestorDirectory(
directory,
func(directory string) (*packagejson.InfoCacheEntry, bool) {
// !!! stop at global cache
if result := r.getPackageJsonInfo(directory, false /*onlyRecordFailures*/); result != nil {
return result, true
}
return nil, false
},
)
return result
}
func (r *resolutionState) getResolvedPackageDirectory() bool {
return r.resolvedPackageDirectory
}
func (r *resolutionState) resolveNodeLike() *ResolvedModule {
if r.resolver.traceEnabled() {
conditions := strings.Join(core.Map(r.conditions, func(c string) string { return `'` + c + `'` }), ", ")
if r.esmMode {
r.resolver.host.Trace(diagnostics.Resolving_in_0_mode_with_conditions_1.Format("ESM", conditions))
} else {
r.resolver.host.Trace(diagnostics.Resolving_in_0_mode_with_conditions_1.Format("CJS", conditions))
}
}
result := r.resolveNodeLikeWorker()
if r.resultFromCache == nil &&
r.resolvedPackageDirectory &&
!r.isConfigLookup &&
r.features&NodeResolutionFeaturesExports != 0 &&
r.extensions&(extensionsTypeScript|extensionsDeclaration) != 0 &&
!tspath.IsExternalModuleNameRelative(r.name) &&
result.IsResolved() &&
result.IsExternalLibraryImport &&
!extensionIsOk(extensionsTypeScript|extensionsDeclaration, result.Extension) &&
slices.Contains(r.conditions, "import") {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Resolution_of_non_relative_name_failed_trying_with_modern_Node_resolution_features_disabled_to_see_if_npm_library_needs_configuration_update.Format())
}
r.features = r.features & ^NodeResolutionFeaturesExports
r.extensions = r.extensions & (extensionsTypeScript | extensionsDeclaration)
diagnosticsCount := len(r.diagnostics)
if diagnosticResult := r.resolveNodeLikeWorker(); diagnosticResult.IsResolved() && diagnosticResult.IsExternalLibraryImport {
result.AlternateResult = diagnosticResult.ResolvedFileName
}
r.diagnostics = r.diagnostics[:diagnosticsCount]
r.resolver.moduleNameCache.setLookupLocations(result, r.failedLookupLocations, r.affectingLocations, r.diagnostics)
}
return result
}
func (r *resolutionState) resolveNodeLikeWorker() *ResolvedModule {
if resolved := r.tryLoadModuleUsingOptionalResolutionSettings(); !resolved.shouldContinueSearching() {
return r.createResolvedModuleHandlingSymlink(resolved)
}
if !tspath.IsExternalModuleNameRelative(r.name) {
if r.features&NodeResolutionFeaturesImports != 0 && strings.HasPrefix(r.name, "#") {
if resolved := r.loadModuleFromImports(); !resolved.shouldContinueSearching() {
return r.createResolvedModuleHandlingSymlink(resolved)
}
}
if r.features&NodeResolutionFeaturesSelfName != 0 {
if resolved := r.loadModuleFromSelfNameReference(); !resolved.shouldContinueSearching() {
return r.createResolvedModuleHandlingSymlink(resolved)
}
}
if strings.Contains(r.name, ":") {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Skipping_module_0_that_looks_like_an_absolute_URI_target_file_types_Colon_1.Format(r.name, r.extensions.String()))
}
return r.createResolvedModule(nil, false)
}
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Loading_module_0_from_node_modules_folder_target_file_types_Colon_1.Format(r.name, r.extensions.String()))
}
if resolved := r.loadModuleFromNearestNodeModulesDirectory(false /*typesScopeOnly*/); !resolved.shouldContinueSearching() {
return r.createResolvedModuleHandlingSymlink(resolved)
}
if r.extensions&extensionsDeclaration != 0 {
// !!!
// if resolved := r.resolveFromTypeRoot(); !resolved.shouldContinueSearching() {
// return r.createResolvedModuleHandlingSymlink(resolved)
// }
}
} else {
candidate := normalizePathForCJSResolution(r.containingDirectory, r.name)
resolved := r.nodeLoadModuleByRelativeName(r.extensions, candidate, false, true)
return r.createResolvedModule(
resolved,
resolved != nil && strings.Contains(resolved.path, "/node_modules/"),
)
}
return r.createResolvedModule(nil, false)
}
func (r *resolutionState) loadModuleFromSelfNameReference() *resolved {
directoryPath := tspath.GetNormalizedAbsolutePath(r.containingDirectory, r.resolver.host.GetCurrentDirectory())
scope := r.getPackageScopeForPath(directoryPath)
if !scope.Exists() || scope.Contents.Exports.IsFalsy() {
// !!! falsy check seems wrong?
return continueSearching()
}
name, ok := scope.Contents.Name.GetValue()
if !ok {
return continueSearching()
}
parts := tspath.GetPathComponents(r.name, "")
nameParts := tspath.GetPathComponents(name, "")
if len(parts) < len(nameParts) || !slices.Equal(nameParts, parts[:len(nameParts)]) {
return continueSearching()
}
trailingParts := parts[len(nameParts):]
var subpath string
if len(trailingParts) > 0 {
subpath = tspath.CombinePaths(".", trailingParts...)
} else {
subpath = "."
}
// Maybe TODO: splitting extensions into two priorities should be unnecessary, except
// https://github.com/microsoft/TypeScript/issues/50762 makes the behavior different.
// As long as that bug exists, we need to do two passes here in self-name loading
// in order to be consistent with (non-self) library-name loading in
// `loadModuleFromNearestNodeModulesDirectoryWorker`, which uses two passes in order
// to prioritize `@types` packages higher up the directory tree over untyped
// implementation packages. See the selfNameModuleAugmentation.ts test for why this
// matters.
//
// However, there's an exception. If the user has `allowJs` and `declaration`, we need
// to ensure that self-name imports of their own package can resolve back to their
// input JS files via `tryLoadInputFileForPath` at a higher priority than their output
// declaration files, so we need to do a single pass with all extensions for that case.
if r.compilerOptions.GetAllowJs() && !strings.Contains(r.containingDirectory, "/node_modules/") {
return r.loadModuleFromExports(scope, r.extensions, subpath)
}
priorityExtensions := r.extensions & (extensionsTypeScript | extensionsDeclaration)
secondaryExtensions := r.extensions & ^(extensionsTypeScript | extensionsDeclaration)
if resolved := r.loadModuleFromExports(scope, priorityExtensions, subpath); !resolved.shouldContinueSearching() {
return resolved
}
return r.loadModuleFromExports(scope, secondaryExtensions, subpath)
}
func (r *resolutionState) loadModuleFromImports() *resolved {
if r.name == "#" || strings.HasPrefix(r.name, "#/") {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Invalid_import_specifier_0_has_no_possible_resolutions.Format(r.name))
}
return continueSearching()
}
directoryPath := tspath.GetNormalizedAbsolutePath(r.containingDirectory, r.resolver.host.GetCurrentDirectory())
scope := r.getPackageScopeForPath(directoryPath)
if !scope.Exists() {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Directory_0_has_no_containing_package_json_scope_Imports_will_not_resolve.Format(directoryPath))
}
return continueSearching()
}
if scope.Contents.Imports.Type != packagejson.JSONValueTypeObject {
// !!! Old compiler only checks for undefined, but then assumes `imports` is an object if present.
// Maybe should have a new diagnostic for imports of an invalid type. Also, array should be handled?
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_no_imports_defined.Format(scope.PackageDirectory))
}
return continueSearching()
}
if result := r.loadModuleFromExportsOrImports(r.extensions, r.name, scope.Contents.Imports.AsObject(), scope /*isImports*/, true); !result.shouldContinueSearching() {
return result
}
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Import_specifier_0_does_not_exist_in_package_json_scope_at_path_1.Format(r.name, scope.PackageDirectory))
}
return continueSearching()
}
func (r *resolutionState) loadModuleFromExports(packageInfo *packagejson.InfoCacheEntry, ext extensions, subpath string) *resolved {
// !!! This is ported exactly, but the falsy check seems wrong
if !packageInfo.Exists() || packageInfo.Contents.Exports.IsFalsy() {
return continueSearching()
}
if subpath == "." {
var mainExport packagejson.ExportsOrImports
switch packageInfo.Contents.Exports.Type {
case packagejson.JSONValueTypeString, packagejson.JSONValueTypeArray:
mainExport = packageInfo.Contents.Exports
case packagejson.JSONValueTypeObject:
if packageInfo.Contents.Exports.IsConditions() {
mainExport = packageInfo.Contents.Exports
} else if dot, ok := packageInfo.Contents.Exports.AsObject().Get("."); ok {
mainExport = dot
}
}
if mainExport.Type != packagejson.JSONValueTypeNotPresent {
return r.loadModuleFromTargetExportOrImport(ext, subpath, packageInfo, false /*isImports*/, mainExport, "", false /*isPattern*/, ".")
}
} else if packageInfo.Contents.Exports.Type == packagejson.JSONValueTypeObject && packageInfo.Contents.Exports.IsSubpaths() {
if result := r.loadModuleFromExportsOrImports(ext, subpath, packageInfo.Contents.Exports.AsObject(), packageInfo, false /*isImports*/); !result.shouldContinueSearching() {
return result
}
}
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Export_specifier_0_does_not_exist_in_package_json_scope_at_path_1.Format(subpath, packageInfo.PackageDirectory))
}
return continueSearching()
}
func (r *resolutionState) loadModuleFromExportsOrImports(
extensions extensions,
moduleName string,
lookupTable *collections.OrderedMap[string, packagejson.ExportsOrImports],
scope *packagejson.InfoCacheEntry,
isImports bool,
) *resolved {
if !strings.HasSuffix(moduleName, "/") && !strings.Contains(moduleName, "*") {
if target, ok := lookupTable.Get(moduleName); ok {
return r.loadModuleFromTargetExportOrImport(extensions, moduleName, scope, isImports, target, "", false /*isPattern*/, moduleName)
}
}
expandingKeys := make([]string, 0, lookupTable.Size())
for key := range lookupTable.Keys() {
if strings.Count(key, "*") == 1 || strings.HasSuffix(key, "/") {
expandingKeys = append(expandingKeys, key)
}
}
slices.SortFunc(expandingKeys, ComparePatternKeys)
for _, potentialTarget := range expandingKeys {
if r.features&NodeResolutionFeaturesExportsPatternTrailers != 0 && matchesPatternWithTrailer(potentialTarget, moduleName) {
target, _ := lookupTable.Get(potentialTarget)
starPos := strings.Index(potentialTarget, "*")
subpath := moduleName[len(potentialTarget[:starPos]) : len(moduleName)-(len(potentialTarget)-1-starPos)]
return r.loadModuleFromTargetExportOrImport(extensions, moduleName, scope, isImports, target, subpath, true, potentialTarget)
} else if strings.HasSuffix(potentialTarget, "*") && strings.HasPrefix(moduleName, potentialTarget[:len(potentialTarget)-1]) {
target, _ := lookupTable.Get(potentialTarget)
subpath := moduleName[len(potentialTarget)-1:]
return r.loadModuleFromTargetExportOrImport(extensions, moduleName, scope, isImports, target, subpath, true, potentialTarget)
} else if strings.HasPrefix(moduleName, potentialTarget) {
target, _ := lookupTable.Get(potentialTarget)
subpath := moduleName[len(potentialTarget):]
return r.loadModuleFromTargetExportOrImport(extensions, moduleName, scope, isImports, target, subpath, false, potentialTarget)
}
}
return continueSearching()
}
func (r *resolutionState) loadModuleFromTargetExportOrImport(extensions extensions, moduleName string, scope *packagejson.InfoCacheEntry, isImports bool, target packagejson.ExportsOrImports, subpath string, isPattern bool, key string) *resolved {
switch target.Type {
case packagejson.JSONValueTypeString:
targetString, _ := target.Value.(string)
if !isPattern && len(subpath) > 0 && !strings.HasSuffix(targetString, "/") {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
}
return continueSearching()
}
if !strings.HasPrefix(targetString, "./") {
if isImports && !strings.HasPrefix(targetString, "../") && !strings.HasPrefix(targetString, "/") && !tspath.IsRootedDiskPath(targetString) {
combinedLookup := targetString + subpath
if isPattern {
combinedLookup = strings.ReplaceAll(targetString, "*", subpath)
}
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Using_0_subpath_1_with_target_2.Format("imports", key, combinedLookup))
r.resolver.host.Trace(diagnostics.Resolving_module_0_from_1.Format(combinedLookup, scope.PackageDirectory+"/"))
}
name, containingDirectory := r.name, r.containingDirectory
r.name, r.containingDirectory = combinedLookup, scope.PackageDirectory+"/"
defer func() {
r.name, r.containingDirectory = name, containingDirectory
}()
if result := r.resolveNodeLike(); result.IsResolved() {
return &resolved{
path: result.ResolvedFileName,
extension: result.Extension,
packageId: result.PackageId,
originalPath: result.OriginalPath,
resolvedUsingTsExtension: result.ResolvedUsingTsExtension,
}
}
return continueSearching()
}
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
}
return continueSearching()
}
var parts []string
if tspath.PathIsRelative(targetString) {
parts = tspath.GetPathComponents(targetString, "")[1:]
} else {
parts = tspath.GetPathComponents(targetString, "")
}
partsAfterFirst := parts[1:]
if slices.Contains(partsAfterFirst, "..") || slices.Contains(partsAfterFirst, ".") || slices.Contains(partsAfterFirst, "node_modules") {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
}
return continueSearching()
}
resolvedTarget := tspath.CombinePaths(scope.PackageDirectory, targetString)
// TODO: Assert that `resolvedTarget` is actually within the package directory? That's what the spec says.... but I'm not sure we need
// to be in the business of validating everyone's import and export map correctness.
subpathParts := tspath.GetPathComponents(subpath, "")
if slices.Contains(subpathParts, "..") || slices.Contains(subpathParts, ".") || slices.Contains(subpathParts, "node_modules") {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
}
return continueSearching()
}
if r.resolver.traceEnabled() {
var messageTarget string
if isPattern {
messageTarget = strings.ReplaceAll(targetString, "*", subpath)
} else {
messageTarget = targetString + subpath
}
r.resolver.host.Trace(diagnostics.Using_0_subpath_1_with_target_2.Format(core.IfElse(isImports, "imports", "exports"), key, messageTarget))
}
var finalPath string
if isPattern {
finalPath = tspath.GetNormalizedAbsolutePath(strings.ReplaceAll(resolvedTarget, "*", subpath), r.resolver.host.GetCurrentDirectory())
} else {
finalPath = tspath.GetNormalizedAbsolutePath(resolvedTarget+subpath, r.resolver.host.GetCurrentDirectory())
}
if inputLink := r.tryLoadInputFileForPath(finalPath, subpath, tspath.CombinePaths(scope.PackageDirectory, "package.json"), isImports); !inputLink.shouldContinueSearching() {
return inputLink
}
if result := r.loadFileNameFromPackageJSONField(extensions, finalPath, targetString, false /*onlyRecordFailures*/); !result.shouldContinueSearching() {
result.packageId = r.getPackageId(result.path, scope)
return result
}
return continueSearching()
case packagejson.JSONValueTypeObject:
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Entering_conditional_exports.Format())
}
for condition := range target.AsObject().Keys() {
if r.conditionMatches(condition) {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Matched_0_condition_1.Format(core.IfElse(isImports, "imports", "exports"), condition))
}
subTarget, _ := target.AsObject().Get(condition)
if result := r.loadModuleFromTargetExportOrImport(extensions, moduleName, scope, isImports, subTarget, subpath, isPattern, key); !result.shouldContinueSearching() {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Resolved_under_condition_0.Format(condition))
}
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Exiting_conditional_exports.Format())
}
return result
} else if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Failed_to_resolve_under_condition_0.Format(condition))
}
} else {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Saw_non_matching_condition_0.Format(condition))
}
}
}
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Exiting_conditional_exports.Format())
}
return continueSearching()
case packagejson.JSONValueTypeArray:
if len(target.AsArray()) == 0 {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
}
return continueSearching()
}
for _, elem := range target.AsArray() {
if result := r.loadModuleFromTargetExportOrImport(extensions, moduleName, scope, isImports, elem, subpath, isPattern, key); !result.shouldContinueSearching() {
return result
}
}
case packagejson.JSONValueTypeNull:
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.X_package_json_scope_0_explicitly_maps_specifier_1_to_null.Format(scope.PackageDirectory, moduleName))
}
return continueSearching()
}
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.X_package_json_scope_0_has_invalid_type_for_target_of_specifier_1.Format(scope.PackageDirectory, moduleName))
}
return continueSearching()
}
func (r *resolutionState) tryLoadInputFileForPath(finalPath string, entry string, packagePath string, isImports bool) *resolved {
// !!!
return continueSearching()
}
func (r *resolutionState) loadModuleFromNearestNodeModulesDirectory(typesScopeOnly bool) *resolved {
mode := core.ResolutionModeCommonJS
if r.esmMode || r.conditionMatches("import") {
mode = core.ResolutionModeESM
}
// Do (up to) two passes through node_modules:
// 1. For each ancestor node_modules directory, try to find:
// i. TS/DTS files in the implementation package
// ii. DTS files in the @types package
// 2. For each ancestor node_modules directory, try to find:
// i. JS files in the implementation package
priorityExtensions := r.extensions & (extensionsTypeScript | extensionsDeclaration)
secondaryExtensions := r.extensions & ^(extensionsTypeScript | extensionsDeclaration)
// (1)
if priorityExtensions != 0 {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Searching_all_ancestor_node_modules_directories_for_preferred_extensions_Colon_0.Format(priorityExtensions.String()))
}
if result := r.loadModuleFromNearestNodeModulesDirectoryWorker(priorityExtensions, mode, typesScopeOnly); !result.shouldContinueSearching() {
return result
}
}
// (2)
if secondaryExtensions != 0 && !typesScopeOnly {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Searching_all_ancestor_node_modules_directories_for_fallback_extensions_Colon_0.Format(secondaryExtensions.String()))
}
return r.loadModuleFromNearestNodeModulesDirectoryWorker(secondaryExtensions, mode, typesScopeOnly)
}
return continueSearching()
}
func (r *resolutionState) loadModuleFromNearestNodeModulesDirectoryWorker(ext extensions, mode core.ResolutionMode, typesScopeOnly bool) *resolved {
result, _ := tspath.ForEachAncestorDirectory(
r.containingDirectory,
func(directory string) (result *resolved, stop bool) {
// !!! stop at global cache
if tspath.GetBaseFileName(directory) != "node_modules" {
if resolutionFromCache := r.tryFindNonRelativeModuleNameInCache(ModeAwareCacheKey{r.name, mode}, directory); !resolutionFromCache.shouldContinueSearching() {
if !resolutionFromCache.isResolved() || extensionIsOk(ext, resolutionFromCache.extension) {
return resolutionFromCache, true
}
}
result := r.loadModuleFromImmediateNodeModulesDirectory(ext, directory, typesScopeOnly)
return result, !result.shouldContinueSearching()
}
return continueSearching(), false
},
)
return result
}
func (r *resolutionState) loadModuleFromImmediateNodeModulesDirectory(extensions extensions, directory string, typesScopeOnly bool) *resolved {
nodeModulesFolder := tspath.CombinePaths(directory, "node_modules")
nodeModulesFolderExists := r.resolver.host.FS().DirectoryExists(nodeModulesFolder)
if !nodeModulesFolderExists && r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(nodeModulesFolder))
}
if !typesScopeOnly {
if packageResult := r.loadModuleFromSpecificNodeModulesDirectory(extensions, r.name, nodeModulesFolder, nodeModulesFolderExists); !packageResult.shouldContinueSearching() {
return packageResult
}
}
if extensions&extensionsDeclaration != 0 {
nodeModulesAtTypes := tspath.CombinePaths(nodeModulesFolder, "@types")
nodeModulesAtTypesExists := nodeModulesFolderExists && r.resolver.host.FS().DirectoryExists(nodeModulesAtTypes)
if !nodeModulesAtTypesExists && r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Directory_0_does_not_exist_skipping_all_lookups_in_it.Format(nodeModulesAtTypes))
}
return r.loadModuleFromSpecificNodeModulesDirectory(extensionsDeclaration, r.mangleScopedPackageName(r.name), nodeModulesAtTypes, nodeModulesAtTypesExists)
}
return continueSearching()
}
func (r *resolutionState) loadModuleFromSpecificNodeModulesDirectory(ext extensions, moduleName string, nodeModulesDirectory string, nodeModulesDirectoryExists bool) *resolved {
candidate := tspath.NormalizePath(tspath.CombinePaths(nodeModulesDirectory, moduleName))
packageName, rest := ParsePackageName(moduleName)
packageDirectory := tspath.CombinePaths(nodeModulesDirectory, packageName)
var rootPackageInfo *packagejson.InfoCacheEntry
// First look for a nested package.json, as in `node_modules/foo/bar/package.json`
packageInfo := r.getPackageJsonInfo(candidate, !nodeModulesDirectoryExists)
// But only if we're not respecting export maps (if we are, we might redirect around this location)
if rest != "" && packageInfo.Exists() {
if r.features&NodeResolutionFeaturesExports != 0 {
rootPackageInfo = r.getPackageJsonInfo(packageDirectory, !nodeModulesDirectoryExists)
}
if !rootPackageInfo.Exists() || rootPackageInfo.Contents.Exports.Type == packagejson.JSONValueTypeNotPresent {
if fromFile := r.loadModuleFromFile(ext, candidate, !nodeModulesDirectoryExists); !fromFile.shouldContinueSearching() {
return fromFile
}
if fromDirectory := r.loadNodeModuleFromDirectoryWorker(ext, candidate, !nodeModulesDirectoryExists, packageInfo); !fromDirectory.shouldContinueSearching() {
fromDirectory.packageId = r.getPackageId(packageDirectory, packageInfo)
return fromDirectory
}
}
}
loader := func(extensions extensions, candidate string, onlyRecordFailures bool) *resolved {
if rest != "" || !r.esmMode {
if fromFile := r.loadModuleFromFile(extensions, candidate, onlyRecordFailures); !fromFile.shouldContinueSearching() {
fromFile.packageId = r.getPackageId(packageDirectory, packageInfo)
return fromFile
}
}
if fromDirectory := r.loadNodeModuleFromDirectoryWorker(extensions, candidate, onlyRecordFailures, packageInfo); !fromDirectory.shouldContinueSearching() {
fromDirectory.packageId = r.getPackageId(packageDirectory, packageInfo)
return fromDirectory
}
// !!! this is ported exactly, but checking for null seems wrong?
if packageInfo.Exists() &&
(packageInfo.Contents.Exports.Type == packagejson.JSONValueTypeNotPresent || packageInfo.Contents.Exports.Type == packagejson.JSONValueTypeNull) &&
r.esmMode {
// EsmMode disables index lookup in `loadNodeModuleFromDirectoryWorker` generally, however non-relative package resolutions still assume
// a default `index.js` entrypoint if no `main` or `exports` are present
if indexResult := r.loadModuleFromFile(extensions, tspath.CombinePaths(candidate, "index"), onlyRecordFailures); !indexResult.shouldContinueSearching() {
indexResult.packageId = r.getPackageId(packageDirectory, packageInfo)
return indexResult
}
}
return continueSearching()
}
if rest != "" {
packageInfo = rootPackageInfo
if packageInfo == nil {
// Previous `packageInfo` may have been from a nested package.json; ensure we have the one from the package root now.
packageInfo = r.getPackageJsonInfo(packageDirectory, !nodeModulesDirectoryExists)
}
}
if packageInfo != nil {
r.resolvedPackageDirectory = true
if r.features&NodeResolutionFeaturesExports != 0 &&
packageInfo.Exists() &&
packageInfo.Contents.Exports.Type != packagejson.JSONValueTypeNotPresent {
// package exports are higher priority than file/directory/typesVersions lookups and (and, if there's exports present, blocks them)
return r.loadModuleFromExports(packageInfo, ext, tspath.CombinePaths(".", rest))
}
if rest != "" {
versionPaths := packageInfo.Contents.GetVersionPaths(r.getTraceFunc())
if versionPaths.Exists() {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.X_package_json_has_a_typesVersions_entry_0_that_matches_compiler_version_1_looking_for_a_pattern_to_match_module_name_2.Format(versionPaths.Version, core.Version, rest))
}
packageDirectoryExists := nodeModulesDirectoryExists && r.resolver.host.FS().DirectoryExists(packageDirectory)
pathPatterns := tryParsePatterns(versionPaths.GetPaths())
if fromPaths := r.tryLoadModuleUsingPaths(ext, rest, packageDirectory, versionPaths.GetPaths(), pathPatterns, loader, !packageDirectoryExists); !fromPaths.shouldContinueSearching() {
return fromPaths
}
}
}
}
return loader(ext, candidate, !nodeModulesDirectoryExists)
}
func (r *resolutionState) tryFindNonRelativeModuleNameInCache(nameAndMode ModeAwareCacheKey, directory string) *resolved {
if result, ok := r.resolver.moduleNameCache.getFromNonRelativeNameCache(nameAndMode, directory, r.redirectedReference); ok {
if r.resolver.traceEnabled() {
r.resolver.host.Trace(diagnostics.Resolution_for_module_0_was_found_in_cache_from_location_1.Format(nameAndMode.Name, directory))
}
r.resultFromCache = result
if result.IsResolved() {
// !!! wtf are these types
return &resolved{
path: result.ResolvedFileName,
extension: result.Extension,
packageId: result.PackageId,
originalPath: result.OriginalPath,
resolvedUsingTsExtension: result.ResolvedUsingTsExtension,
}
}
return unresolved()
}
return continueSearching()
}
func (r *resolutionState) createResolvedModuleHandlingSymlink(resolved *resolved) *ResolvedModule {
isExternalLibraryImport := resolved != nil && strings.Contains(resolved.path, "/node_modules/")
if r.resultFromCache == nil &&
r.compilerOptions.PreserveSymlinks != core.TSTrue &&
isExternalLibraryImport &&
resolved.originalPath == "" &&
!tspath.IsExternalModuleNameRelative(r.name) {
originalPath, resolvedFileName := r.getOriginalAndResolvedFileName(resolved.path)
if originalPath != "" {
resolved.path = resolvedFileName
resolved.originalPath = originalPath
}
}
return r.createResolvedModule(resolved, isExternalLibraryImport)
}
func (r *resolutionState) createResolvedModule(resolved *resolved, isExternalLibraryImport bool) *ResolvedModule {
if r.resultFromCache != nil {
var result *ResolvedModule
if !r.resolver.moduleNameCache.isReadonly {
result = r.resultFromCache
r.resolver.moduleNameCache.appendLookupLocations(result, r.failedLookupLocations, r.affectingLocations, r.diagnostics)
} else {
cloned := *r.resultFromCache
result = &cloned
r.resolver.moduleNameCache.setLookupLocations(result, r.failedLookupLocations, r.affectingLocations, r.diagnostics)
}
return result
}
var resolvedModule ResolvedModule
if resolved != nil {
resolvedModule = ResolvedModule{
ResolvedFileName: resolved.path,
OriginalPath: resolved.originalPath,
IsExternalLibraryImport: isExternalLibraryImport,
ResolvedUsingTsExtension: resolved.resolvedUsingTsExtension,
Extension: resolved.extension,
PackageId: resolved.packageId,
}
}