Testing web-features with TS and ESM modules

This repo demonstrates web-platform-dx/web-features#1980 (comment)

Setup

yarn install
yarn tsc --build

Results

$ yarn tsc --build
node_modules/web-features/index.d.ts:1:32 - error TS2307: Cannot find module './types.quicktype' or its corresponding type declarations.

1 declare const browsers: import("./types.quicktype").Browsers, features: {
                                 ~~~~~~~~~~~~~~~~~~~

node_modules/web-features/index.d.ts:2:27 - error TS2834: Relative import paths need explicit file extensions in ECMAScript imports when '--moduleResolution' is 'node16' or 'nodenext'. Consider adding an extension to the import path.

2     [key: string]: import("./types").FeatureData | import("./types").FeatureMovedData | import("./types").FeatureSplitData;
                            ~~~~~~~~~

node_modules/web-features/index.d.ts:2:59 - error TS2834: Relative import paths need explicit file extensions in ECMAScript imports when '--moduleResolution' is 'node16' or 'nodenext'. Consider adding an extension to the import path.

2     [key: string]: import("./types").FeatureData | import("./types").FeatureMovedData | import("./types").FeatureSplitData;
                                                            ~~~~~~~~~

node_modules/web-features/index.d.ts:2:96 - error TS2834: Relative import paths need explicit file extensions in ECMAScript imports when '--moduleResolution' is 'node16' or 'nodenext'. Consider adding an extension to the import path.

2     [key: string]: import("./types").FeatureData | import("./types").FeatureMovedData | import("./types").FeatureSplitData;
                                                                                                 ~~~~~~~~~

node_modules/web-features/index.d.ts:4:27 - error TS2307: Cannot find module './types.quicktype' or its corresponding type declarations.

4     [key: string]: import("./types.quicktype").GroupData;
                            ~~~~~~~~~~~~~~~~~~~

node_modules/web-features/index.d.ts:6:27 - error TS2307: Cannot find module './types.quicktype' or its corresponding type declarations.

6     [key: string]: import("./types.quicktype").SnapshotData;
                            ~~~~~~~~~~~~~~~~~~~


Found 6 errors.