Rolldown-Vite

[sapphi-red]

Description

Current Status

• Vite repo test status
  • ✅ unit tests
  • e2e tests
    • ✅ assets: skipping watch related tests
    • ✅ external: changed the test for intended behavior change
    • ❌ legacy: system output is not supported yet
    • ❌ object-hooks: sequential object hooks are not supported yet
    • ⚠️ optimize-deps: skipped in build due to [Feature Request]: The behavior of dynamic import a cjs module rolldown/rolldown#2031
    • ✅ resolve: skipped some browser field related tests as those cases were only supported by esbuild and Vite, also skipped some test that does fallback based on the file content which is Vite only and I believe it should not be done
• ecosystem-ci (see https://github.com/vitejs/vite-ecosystem-ci/blob/rolldown-vite/README-temp.md)

Intended behavior differences

• esbuild needs to be installed manually in the following cases:
  • when using build.minify: 'esbuild'
  • when using a plugin using transformWithEsbuild function
• process.env.ROLLDOWN_OPTIONS_VALIDATION = 'loose' may need to be set to allow options not supported by rolldown
• transformer: define does not share reference for objects oxc-project/oxc#7641
• require is never transformed into import, users needs to inject a polyfill on their own, see f4c3629

Known missing features

• plugin-legacy
• output.format: 'system' ([Feature Request]: Support for System JS as output format rolldown/rolldown#2387)
• watch mode support: partially implemented in rolldown, but not yet in rolldown-vite
  • options.watch
  • watcher.on('event', listener)
  • related hooks: shouldTransformCachedModule, watchChange, closeWatcher
• export { declaredVar } errors ([Bug]: Unsupported declare export rolldown/rolldown#3048, transformer: declare export oxc-project/oxc#7951)
  • commonly used by Vitepress's typed data loaders feature
• resolveImportMeta hook (resolveImportMeta hook implement rolldown/rolldown#1010)
• preserveEntrySignatures option / preserveSignatures in emitFile ([Feature Request]: Support preserveEntrySignatures option / preserveSignatures in emitFile rolldown/rolldown#3500)
• better chunking
  • for sideeffect free barrel files ([Feature Request]: skip sideeffect free barrel files from the module graph when chunking rolldown/rolldown#3746)
  • Less common chunks if rolldown doesn't need to preserve the exports of entires rolldown/rolldown#1842

related to native plugins

• alias
  • does not support customResolver option
• resolver
  • does not use the correct package.json (A new API to get the nearest package.json with name field oxc-project/oxc-resolver#396)
• define
  • per-environment config is not supported yet
• transform
  • does not read tsconfig
  • does not support options
• dynamic import vars
  • does not support resolving with createResolver
• import glob
  • does not support alias
  • does not support subpath imports: https://github.com/rolldown/rolldown/blob/4caa0a93f9ed42bcf9e152c6a4949bacd879b932/crates/rolldown_plugin_import_glob/src/lib.rs#L457
• build-transform
  • does not support options
• manifest
  • cannot use data on Vite side (e.g. css/assets)
    • I cannot make a simple reproduction for this one. If you only enable the native manifest plugin and run build in playground/backend-integration, you can see the manifest not containing css and assets field in index.html

TODO list for me

• setup publish flow
• set rolldown's minify target

[pkg-pr-new]

Open in Stackblitz

npm i https://pkg.pr.new/vitejs/rolldown-vite@84

commit: fa33494