rolldown 1.0.0-beta.38

v1.0.0-beta.38

on Node.js NPM

[1.0.0-beta.38] - 2025-09-15

⚡ Windows Performance Boost

• ~10% faster bundling on Windows
• Powered by oxc-resolver optimizations

📦 OXC Runtime Helpers Now Embedded

• Instant loading: Memory access instead of file I/O
• 91% smaller: From 229 KB external package to ~25 KB in binary
• Universal support: Works seamlessly in all environments including browsers
• Zero dependencies: Helpers embedded directly, no @oxc-project/runtime needed

Both improvements require zero configuration - just update to the latest version and enjoy! 🎉

🚀 Features

• rolldown: oxc v0.89.0 (#6220) by @Boshen
• rolldown_plugin_esm_external_require: add duplicate external detection (#6202) by @shulaoda
• cross module noop function optimization (#6199) by @IWANABETHATGUY
• support to specify scan_mode in bundler.scan (#6204) by @IWANABETHATGUY
• warn when transform options override tsconfig compiler options (#6197) by @shulaoda
• support false in resolve.alias to ignore resolution (#6203) by @shulaoda
• cli: remove getJsonSchema (#6186) by @shulaoda
• cli: add Node.js version warning for unsupported versions (#6150) by @Copilot
• rolldown_plugin_oxc_runtime: include version in virtual module paths (#6179) by @shulaoda
• add native react-refresh-wrapper plugin (#6144) by @sapphi-red
• rolldown_plugin_utils: add to_string_literal (#6178) by @sapphi-red
• improve error messages for builtin plugins (#6175) by @shulaoda
• indent module content in IIFE format (#6174) by @IWANABETHATGUY
• rolldown_error: improve N-API error handling logic (#6171) by @shulaoda
• rolldown_error: improve ByteLocator#byte_offset (#6169) by @shulaoda
• dev: skip writing to file (#6148) by @sapphi-red
• dev: add skip_write option (#6151) by @sapphi-red
• dev: ignore file metadata changes (#6138) by @sapphi-red
• dev: add PathsMut for debounced PollWatcher (#6139) by @sapphi-red
• dev: use PathsMut for debounced RecommendedWatcher (#6137) by @sapphi-red
• improve bundler initialization error handling (#6132) by @shulaoda

🐛 Bug Fixes

• rolldown_plugin_vite_resolve: correctly handle Windows drive paths with leading slash (#6209) by @shulaoda
• allow jsx.pragmaFrag instead of jsx.pragmaFlag (#6200) by @sapphi-red
• improve import-glob plugin error handling without panic (#6106) by @hikomoon
• Panic with "jsx": "preserve" when rewrite a memberExpression (#6192) by @IWANABETHATGUY
• rolldown_error: use byte_slice instead of slice for correct span handling (#6185) by @shulaoda
• generate valid identifier for export names with minifyInternalExports (#6166) by @sapphi-red
• useless __export helper usage (#6160) by @IWANABETHATGUY
• incremental watch modify entry module (#6156) by @IWANABETHATGUY
• register trace subscriber (#6145) by @sapphi-red
• json imports error with eval or arguments in strict mode (#6140) by @IWANABETHATGUY
• process is not defined in repl (#6147) by @IWANABETHATGUY

💼 Other

• rolldown: support to build rolldown with .wasm binding (#6153) by @hyf0
• rolldown: refactor build.ts to prepare to support build rolldown package with wasi binding (#6152) by @hyf0

🚜 Refactor

• share FlatOptions in whole build session (#6211) by @IWANABETHATGUY
• remove unnecessary comments in ScopeHoistingFinalizerContext (#6205) by @IWANABETHATGUY
• move external string/regex matching from JS to Rust (#6201) by @shulaoda
• rename cross_module_inline_const to cross_module_optimization (#6193) by @IWANABETHATGUY
• rename class and function visitor to class_decl, function_decl (#6176) by @IWANABETHATGUY
• rolldown_error: tweak code (#6168) by @shulaoda
• improve BuildDiagnostic (#6165) by @shulaoda
• improve RolldownBuild (#6136) by @shulaoda
• rolldown_error: remove unused EventKind::IoError (#6134) by @shulaoda
• rename CustomPathsMut to NotifyPathsMutAdapter and move to utils (#6135) by @hyf0

📚 Documentation

• contrib-guide: add profiling instructions for macOS (#6183) by @sapphi-red
• contrib-guide: update just commands (#6181) by @sapphi-red

⚡ Performance

• pre calculate side_effects_free_function_symbol_ref (#6206) by @IWANABETHATGUY
• parallel clone ast (#6167) by @IWANABETHATGUY
• reserve capacity for rendered modules in instantiate_chunk (#6159) by @sapphi-red

🧪 Testing

• hmr: ensure each test isolated to be able to be retryed (#6142) by @hyf0

⚙️ Miscellaneous Tasks

• deps: lock file maintenance npm packages (#6219) by @renovate[bot]
• deps: lock file maintenance rust crates (#6217) by @renovate[bot]
• deps: update github-actions (#6213) by @renovate[bot]
• deps: lock file maintenance npm packages (#6215) by @renovate[bot]
• deps: update github-actions (major) (#6214) by @renovate[bot]
• tweak wordings (#6208) by @iiio2
• fix unused import warnings (#6196) by @shulaoda
• correct deprecated JSDoc reference for jsx option (#6195) by @shulaoda
• add if: always() to wasi-test (#6190) by @sapphi-red
• skip @rolldown/browser build if no node related changes detected (#6189) by @sapphi-red
• extract wasi build to reusable workflow (#6188) by @sapphi-red
• deps: update dependency tsdown to v0.15.1 (#6184) by @renovate[bot]
• deps: update dependency rolldown-plugin-dts to v0.16.5 (#6182) by @renovate[bot]
• deps: update dependency rolldown-plugin-dts to v0.16.4 (#6180) by @renovate[bot]
• dev: implement Debug trait for DevOptions (#6173) by @sapphi-red
• deps: update dependency rolldown-plugin-dts to v0.16.3 (#6172) by @renovate[bot]
• update @napi-rs/cli and js binding (#6157) by @Brooooooklyn
• ci: ensure @rolldown/browser build without errors (#6155) by @hyf0
• ci: ensure running wasi tests correctly (#6154) by @hyf0
• add more tracing instrumentation (#6149) by @sapphi-red
• extend timeout for rollup test (#6143) by @IWANABETHATGUY
• rolldown_error: remove unnecessary type_aliases.rs (#6133) by @shulaoda