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

Highlights

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

🐛 Bug Fixes

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

💼 Other

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

🚜 Refactor

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

📚 Documentation

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

⚡ Performance

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

🧪 Testing

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

⚙️ Miscellaneous Tasks

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