Add `x_google_ignoreList` (Ignore-listing code) support to sourcemaps

この issue ではファイル、テスト、エントリポイントが指定されていません。まず、microbundle が sourcemap の生成を Rollup に委譲する流れを追跡し、次に生成された map を source-map ignoreList specification と比較してください。生成された sourcemap が、要求された ignore-list フィールドを通じて framework または dependency のソースを識別し、関連する出力パスをカバーできれば完了です。

Introduce the x_google_ignoreList extension in the sourcemaps generated by this project. This will facilitate a more streamlined debugging experience in Chrome (and other supporting browsers) by automatically filtering out framework and dependency code.

Benefit

Implementing x_google_ignoreList in the sourcemaps will align this project with modern web development practices, offering a more focused and efficient debugging experience for developers using Chrome DevTools. This change will particularly benefit those who regularly engage in debugging complex applications with numerous dependencies.

Background Context

• https://developer.chrome.com/blog/devtools-modern-web-debugging/#just-my-code

  • The ignore-listing is enabled by populating an extra x_google_ignoreList field in the source map that Angular generates when compiling the project. The Chrome DevTools team encourages other framework authors to implement a similar change. Refer to the Case Study: Better Angular Debugging with DevTools post for more details.

• https://developer.chrome.com/blog/devtools-better-angular-debugging/#ignore-listing-code

  • Ignore-listing code
    When debugging applications using Chrome DevTools, authors generally only want to see just their code, not that of the framework underneath or some dependency tucked away in the node_modules folder.

    To achieve this, the DevTools team has introduced an extension to source maps, called x_google_ignoreList. This extension is used to identify third-party sources such as framework code or bundler-generated code. When a framework uses this extension, authors now automatically avoid code that they don't want to see or step through without having to manually configure this beforehand.

    The x_google_ignoreList source map extension is supported by Chrome DevTools starting with Chrome 106.

• https://developer.chrome.com/articles/x-google-ignore-list/

  • The ignoreList source map extension

    Improve debugging experience in Chrome DevTools with the ignoreList source map extension.

• https://developer.chrome.com/blog/new-in-devtools-120/#ignore-list-spec

  • The source maps specification has adopted the ignoreList field instead of x_google_ignoreList and DevTools now supports the new name with a fallback for the old one. Frameworks and bundlers can now use the new field name.

Originally posted by @0xdevalias in https://github.com/facebook/react/issues/27774#issuecomment-1836969520

• https://tc39.es/source-map-spec/#ignorelist

See Also

• https://github.com/facebook/react/issues/27774
• https://github.com/markerikson/react-prod-sourcemaps/issues/19
• https://github.com/vercel/next.js/issues/41370
  • https://github.com/vercel/next.js/discussions/41371
• https://github.com/vuejs/rfcs/discussions/607
• https://github.com/sveltejs/svelte/issues/9740
• https://github.com/angular/angular-cli/pull/23545
• https://nuxt.com/blog/v3-3#better-logging-in-browser-devtools
  • https://github.com/nuxt/nuxt/pull/19243
• https://vitejs.dev/config/server-options.html#server-sourcemapignorelist
  • https://github.com/vitejs/vite/pull/12174
  • https://github.com/vitejs/vite/pull/12633
  • https://github.com/vitejs/vite/pull/12694
• https://rollupjs.org/configuration-options/#output-sourcemapignorelist
  • https://github.com/rollup/rollup/issues/4847
  • https://github.com/rollup/rollup/pull/4846
  • https://github.com/rollup/rollup/pull/4848
  • https://github.com/rollup/rollup/pull/4926
• https://github.com/Rich-Harris/magic-string/issues/241
  • https://github.com/Rich-Harris/magic-string/pull/240
  • https://github.com/Rich-Harris/magic-string/pull/243