Rolldown Release Notes

🚀 Features

• dev: skip shipping factories for newly imported top-level modules (#10223) by @h-a-n-a
• dev: per-client ship map for HMR patch sizing (#10208) by @h-a-n-a
• dev: client-side HMR (#10164) by @h-a-n-a
• dev: send a full-reload update to clients when a tsconfig changes (#10262) by @shulaoda
• treat import.meta['url'] and import.meta['ROLLUP_FILE_URL_*'] as side-effect free (#10267) by @sapphi-red
• rewrite import.meta['url'] (#10251) by @sapphi-red
• add FILE_NOT_FOUND error (#10220) by @sapphi-red
• treat import.meta.ROLLUP_FILE_URL_* as side-effect free (#10217) by @sapphi-red

🐛 Bug Fixes

• sourcemap: preserve unmapped boundaries during composition (#10254) by @hyfdev
• [format] in *FileNames option for ESM format should be es instead of esm (#10214) by @sapphi-red
• sourcemap: preserve coarse mappings during composition (#10249) by @hyfdev
• rolldown_plugin_vite_import_glob: support tsconfig paths with import.meta.glob (#10167) by @sapphi-red
• dev: clear tsconfig caches for bare full builds (#10276) by @shulaoda
• dev: force a full rebuild when a tsconfig changes (#10261) by @shulaoda
• treat rooted drive-less module ids as absolute in preserveModules naming (#10235) by @IWANABETHATGUY
• watch: rebuild when tsconfig files change (#10258) by @shulaoda
• watch: drop tsconfig-merged transform options on each rebuild (#10257) by @shulaoda
• incorrect EMPTY_IMPORT_META warning for import.meta.ROLLUP_FILE_URL_* for CJS output (#10221) by @sapphi-red
• deconflict: rename CJS locals shadowing wrapped-ESM namespace objects (#9970) by @IWANABETHATGUY
• rolldown: drop the unused runtime module after entry-level external flattening (#10237) by @IWANABETHATGUY
• rolldown: re-propagate has_dynamic_exports to transitive star importers (#10239) by @IWANABETHATGUY
• tree-shaking: tree-shake destructured dynamic import namespace bindings (#10213) by @logaretm
• s390x: use json-escape-simd 3.1.1 for big-endian JSON escaping fix (#10211) by @satyamg1620

🚜 Refactor

• dev: move full-reload to client side (#10207) by @h-a-n-a
• readability follow-ups to the ReplaceWith migration (#10286) by @IWANABETHATGUY
• replace take_in-then-write-back with ReplaceWith and by-value moves (#10285) by @Boshen
• share the main resolver's cache with the transformer's tsconfig lookups (#10205) by @shulaoda
• rolldown: extract the ns star-external __reExport emission rule into LinkingMetadata (#10238) by @IWANABETHATGUY
• rolldown: unify link/generate diagnostics into a Diagnostics accumulator (#10234) by @IWANABETHATGUY
• sourcemap_filenames: drop dead sourcemap-filename plumbing (#10189) by @IWANABETHATGUY
• extract external import symbol merging into a method (#10224) by @IWANABETHATGUY
• rolldown: skip CJS namespace merging under strict execution order (#10203) by @hyfdev
• resolve the manual tsconfig per file instead of once at startup (#10200) by @shulaoda
• rolldown: route interop ESM init emission through a shared init-target view (#10202) by @hyfdev
• rolldown: collapse vestigial wrap-kind state and share chunk sort helper (#10201) by @hyfdev

📚 Documentation

• show plugin kinds in JSDoc and each hook's description (#10218) by @sapphi-red
• add an explanation about removing imports from external modules without any messages (#10215) by @sapphi-red

⚡ Performance

• sourcemap: owned merge in SourceJoiner::join (4005->5 allocs/chunk) (#10250) by @Boshen
• avoid redundant sourcemap string copies in collapse and minify paths (#10093) by @Boshen

🧪 Testing

• code-splitting: establish strict-order review baselines (#10287) by @hyfdev
• dev: add hot API test cases (#10181) by @h-a-n-a
• code-splitting: normalize strict execution order variants (#10277) by @hyfdev
• code-splitting: harden strict execution order coverage (#10252) by @hyfdev
• code-splitting: add strict execution order regressions (#10253) by @hyfdev

⚙️ Miscellaneous Tasks

• deps: update github actions (#10241) by @renovate[bot]
• deps: update oxc to 0.140.0 (#10274) by @shulaoda
• update Yunfei's GitHub username (#10275) by @hyfdev
• deps: update napi (#10260) by @renovate[bot]
• deps: update test262 submodule for tests (#10266) by @rolldown-guard[bot]
• deps: update dependency vite-plus to v0.2.4 (#10256) by @renovate[bot]
• deps: update napi (#10240) by @renovate[bot]
• deps: update oxc resolver to v11.24.2 (#10245) by @renovate[bot]
• deps: update rust crates (#10244) by @renovate[bot]
• disable Renovate updates for idna_adapter (#10248) by @shulaoda
• deps: update oxc resolver to v11.24.1 (#10232) by @renovate[bot]
• deps: update rust crate oxc_sourcemap to v8.1.1 (#10233) by @renovate[bot]
• deps: update dependency rolldown-plugin-dts to ^0.27.0 (#10206) by @renovate[bot]
• deps: upgrade sugar_path to v3 (#10230) by @hyfdev
• add dist-* to .gitignore in sourcemap-filenames/hash-final-content fixture (#10216) by @sapphi-red
• deps: update dependency rust to v1.97.0 (#10209) by @renovate[bot]

❤️ New Contributors

• @satyamg1620 made their first contribution in #10211

🚀 Features

• detect top-level import-binding reads as execution-order sensitive (#10180) by @hyf0
• sourcemap_filenames: add a sourcemapFileNames option (#9271) by @V1OL3TF0X
• binding: record plugin hook result kind in tracing spans (#10154) by @IWANABETHATGUY
• linking: skip side-effect-free modules in per-entry reachability (#10111) by @IWANABETHATGUY
• improve error message for unresolved virtual imports (#10156) by @sapphi-red
• add descriptive metadata to plugin API (#10106) by @sapphi-red
• add --configLoader=native option (#10118) by @sapphi-red

🐛 Bug Fixes

• improve invalid annotation warnings (#10185) by @hyf0
• keep deduplicated asset filenames stable once they can be observed (#10191) by @shulaoda
• sourcemap_filenames: use public option name in pattern errors (#10188) by @IWANABETHATGUY
• sourcemap_filenames: hash prepared sourcemap content (#10178) by @hyf0
• tree-shake unused circular declarators exported via export list (#10166) by @IWANABETHATGUY
• dev: don't panic when an HMR rebuild hits an unresolved import (#10162) by @shulaoda
• propagate errors from output.globals function (#9880) by @shulaoda
• dev: revert cache mutations when a partial scan fails (#10110) by @shulaoda
• dev: update importer relationships of cached modules in incremental build (#10107) by @shulaoda
• hmr: fall back to full reload when a changed module is not registered as executed (#10132) by @shulaoda
• chunk-optimizer: follow entry facade edges in runtime placement cycle check (#10101) by @hyf0
• dev: ignore watcher events after close (#10113) by @hyf0
• emit async wrapper for TLA modules under onDemandWrapping (#10086) by @IWANABETHATGUY
• gate sideEffects:false modules' side effects on body demand (#10080) by @IWANABETHATGUY
• rolldown_plugin_vite_resolve: return empty object for browser: false mapped modules (#10082) by @sapphi-red
• reset the word-boundary state on newline in Hires::Boundary sourcemaps (#10025) by @shulaoda
• trim an emptied chunk's outro/intro instead of skipping past it (#10029) by @shulaoda
• test each edited chunk's own start against indent exclude ranges (#10026) by @shulaoda
• preserve sourcemap mappings for indented lines when a CJS module shares the chunk (#10074) by @hyf0

🚜 Refactor

• separate tree-shaking side effects from execution order sensitivity (#10168) by @hyf0
• type construct_vite_preload_call to take an ObjectPattern (#10135) by @shulaoda
• treeshake: single-source the own-export classification shared with the lazy-barrel loader (#10098) by @IWANABETHATGUY
• dev: reuse Vite's bundledDev server (#10081) by @h-a-n-a
• clippy: ban std HashMap/HashSet in favour of FxHashMap/FxHashSet (#10108) by @Boshen
• treeshake: make body demand a second module bit instead of a stmt multimap (#10097) by @IWANABETHATGUY
• seal used_symbol_refs by construction after its last writer (#10091) by @hyf0
• treeshake: replace inclusion mutual recursion with a worklist engine (#10096) by @IWANABETHATGUY
• treeshake: split include_statements.rs into focused modules (#10095) by @IWANABETHATGUY
• drop redundant is_user_defined filter on partitioned entries (#10050) by @shulaoda
• project the retained export interface out of used_symbol_refs (#10089) by @hyf0
• track used external symbols separately from used_symbol_refs (#10088) by @hyf0
• make module namespace inclusion an explicit linking metadata field (#10087) by @hyf0
• rename statement evaluation metadata (#10078) by @hyf0

📚 Documentation

• virtual modules user-facing id convention (#10155) by @sapphi-red
• cli: clarify disabling boolean/object flags like codeSplitting (#10153) by @IWANABETHATGUY
• chore: remove Vite+ alpha banner (#10105) by @mdong1909
• write down the used_symbol_refs contract (#10090) by @hyf0
• dev/lazy: update design and implementation (#10079) by @h-a-n-a

⚡ Performance

• ast_scanner: stop order-sensitivity checks once a module is flagged (#10190) by @IWANABETHATGUY
• return impl ExactSizeIterator from slice-backed accessors (#10133) by @Boshen
• binding: box dev and watcher napi futures (#10103) by @Boshen

🧪 Testing

• move string_wizard replace unit tests to the JS magic-string suite (#10176) by @IWANABETHATGUY
• dev: assert incremental scan state matches a fresh full build after each HMR step (#10115) by @shulaoda
• dev: restore runtime assertions of delete_file_not_used_anymore (#10112) by @shulaoda
• dev: fix flaky dev server tests in CI (#10152) by @h-a-n-a
• add regression test for #10099 (lazyBarrel drops default-import binding but keeps its property reads) (#10109) by @IWANABETHATGUY

⚙️ Miscellaneous Tasks

• deploy website to Void via GitHub OIDC (#10192) by @Boshen
• deps: update oxc to 0.139.0 (#10161) by @shulaoda
• deps: update test262 submodule for tests (#10160) by @rolldown-guard[bot]
• rolldown_plugin_utils: remove dead asset-url and css scaffolding (#10131) by @shulaoda
• deps: revert vite-plus to v0.2.1 (#10148) by @shulaoda
• deps: update github actions (#10141) by @renovate[bot]
• deps: update dependency rust to v1.96.1 (#10145) by @renovate[bot]
• deps: update npm packages (#10142) by @renovate[bot]
• deps: update rust crates (#10143) by @renovate[bot]
• deps: update napi to v3.10.3 (#10121) by @renovate[bot]
• rolldown_utils: remove unused time module (#10138) by @shulaoda
• remove dead CopyModulePlugin::is_active method (#10129) by @shulaoda
• remove dead LazyCompilationContext::is_lazy_module method (#10128) by @shulaoda
• remove dead BuildDiagnostic::downcast_ref method (#10127) by @shulaoda
• deps: update dependency vite-plus to v0.2.2 (#10084) by @renovate[bot]
• deps: update rust crate oxc_sourcemap to v8.1.0 (#10122) by @renovate[bot]
• deps: update crate-ci/typos action to v1.48.0 (#10124) by @renovate[bot]
• enable more clippy restriction lints (#10114) by @Boshen
• deps: update rust dependencies (#10100) by @Boshen
• deps: update oxc resolver to v11.23.0 (#10083) by @renovate[bot]

◀️ Revert

• Revert "chore(deps): revert vite-plus to v0.2.1" (#10157) by @h-a-n-a
• "fix(hmr): fall back to full reload when a changed module is not registered as executed (#10132)" (#10151) by @shulaoda

❤️ New Contributors

• @V1OL3TF0X made their first contribution in #9271

🚀 Features

• disable experimental.lazyBarrel by default (#10071) by @shulaoda

🐛 Bug Fixes

• dev: disable lazy barrel in dev mode (#10060) by @shulaoda
• generate: keep full JSON interface under preserveModules namespa… (#10056) by @IWANABETHATGUY
• check finalize_other_specifiers in its own Debug attribute (#10032) by @shulaoda
• serialize the KeepAssign unused minify option as "keep_assign" (#10031) by @shulaoda
• keep fragments after the newline fragment in MagicString::last_line (#10023) by @shulaoda
• generate: undeclared JSON named exports under preserveModules (#10020) (#10027) by @IWANABETHATGUY
• deconflict: rename CJS-wrapped locals that shadow chunk-root bindings (#9921) by @IWANABETHATGUY
• rolldown: keep entry facade when a shared chunk holds another entry's module (#9997) by @hyf0
• treeshake: also bail JSON default split when the object escapes (#9996) by @IWANABETHATGUY
• don't classify await in a strict-mode function as top-level await (#9987) by @shulaoda
• avoid spurious leading newline in addon hooks (banner/footer/intro/outro) (#9989) by @shulaoda
• handle JSON default mutation bailouts (#9972) by @TheAlexLichter
• plugin: make lazy hook metadata enumerable (#9991) by @TheAlexLichter
• dev: make init errors in lazy-compiled modules catchable (#9981) by @h-a-n-a
• treeshake: keep computed-key side effects on namespace member access (#9986) by @shulaoda
• binding: validate replace plugin delimiters length instead of panicking (#9984) by @shulaoda
• reconstruct nested rest patterns in into_expression (#9980) by @IWANABETHATGUY
• reconstruct rest patterns as spread in into_expression (#9976) by @shulaoda
• preserve export keyword on multi-declarator exports under keepNames (#9974) by @shulaoda
• deterministically keep the shortest name for deduplicated assets (#9948) by @x1024
• treeshake: apply @NO_SIDE_EFFECTS to cross-chunk namespace calls (#9960) by @IWANABETHATGUY

🚜 Refactor

• drop redundant program scope enter/leave in finalizer (#10049) by @shulaoda
• deconflict: extract collect_chunk_scope_captured_names (#10006) by @IWANABETHATGUY
• unify pre-scan multi-declarator split into one decision site (#9982) by @IWANABETHATGUY
• common: return bool from SymbolRef::is_not_reassigned (#9962) by @IWANABETHATGUY

📚 Documentation

• rolldown: remove outdated comment for removing parenthesized expression (#10062) by @Dunqing
• use GitHub-flavored alert for Etiquette note in contribution guide (#10012) by @IWANABETHATGUY
• replace: explain the delimiters left and right boundaries (#9985) by @shulaoda
• ast-mutation: remove stale Address Use section after pre-scan refactor (#9983) by @IWANABETHATGUY
• remove fathom (#9968) by @mdong1909
• contribution-guide: code-format main branch references (#9966) by @IWANABETHATGUY
• contribution-guide: fix stale REPL note and tidy wording (#9957) by @hyf0
• contribution-guide: clarify when to discuss before opening a PR (#9955) by @hyf0

⚡ Performance

• disable preserve_parens across all parse paths (#10057) by @Dunqing
• common: inline declared_symbols with SmallVec (#9920) by @IWANABETHATGUY
• common: pack TaggedSymbolRef into 8 bytes (#9919) by @IWANABETHATGUY
• sourcemap: skip newline scan on the no-sourcemap join fast path (#9936) by @Boshen

🧪 Testing

• dev: error in lazy module should be catchable (#9975) by @sapphi-red
• dev: reject unknown lazy compile modules (#9969) by @sapphi-red

⚙️ Miscellaneous Tasks

• deps: update actions/cache action to v6 (#10001) by @renovate[bot]
• trigger vite ecosystem-ci from PR comments (#10058) by @shulaoda
• deps: update napi to v3.10.0 (#10063) by @renovate[bot]
• remove unused From impl for RolldownLabelSpan (#10055) by @shulaoda
• remove dead Diagnostic::with_kind method (#10054) by @shulaoda
• remove unused StatementExt methods (#10053) by @shulaoda
• remove unused ExpressionExt methods (#10052) by @shulaoda
• remove commented-out re_export_all_names field (#10051) by @shulaoda
• deps: update pnpm to v11.9.0 (#10047) by @renovate[bot]
• remove the unused BindingGenerateHmrPatchReturn napi type (#10034) by @shulaoda
• remove the dead inline_entry_chunk_wrapping scaffolding (#10037) by @shulaoda
• deps: bump oxc_resolver to 11.22.0 (#10045) by @Boshen
• remove never-constructed MatchImportKind::_Ignore variant (#10041) by @shulaoda
• remove the unused ScheduledBuild napi struct (#10033) by @shulaoda
• remove dead compute_hmr_update_single method (#10040) by @shulaoda
• drop the redundant visited.insert in manual code splitting (#10038) by @shulaoda
• remove the dead output_assets vector in render_chunk_to_assets (#10036) by @shulaoda
• remove the unused From/Display impls for BindingLogLevel (#10035) by @shulaoda
• deps: upgrade oxc to 0.138.0 and migrate to per-type AST construction (#10018) by @shulaoda
• deps: update rust crates (#9911) by @renovate[bot]
• deps: update test262 submodule for tests (#10016) by @rolldown-guard[bot]
• deps: update github actions (#9999) by @renovate[bot]
• deps: update npm packages (#10000) by @renovate[bot]

◀️ Revert

• "fix(plugin): make lazy hook metadata enumerable (#9991)" (#10005) by @shulaoda

❤️ New Contributors

• @x1024 made their first contribution in #9948

Bug Fixes

• defer_drop crashes the browser main thread (#9942) by @shulaoda
• camel-case: correct camel case for nested values (#9933) by @kb019
• cli: display --help options in camelCase (#9941) by @IWANABETHATGUY
• preserve used re-exports under preserveModules (#9122) (#9934) by @IWANABETHATGUY
• watch: make close reentrant in event callbacks (#9904) by @hyf0
• git for windows treats symlink files as regular files (#9915) by @AliceLanniste
• dev: cancel pending full reload on build error (#9903) by @h-a-n-a
• chunking: pass plugin meta to codeSplitting groups name function (#9267) by @Kyujenius
• dev: serve assets emitted during HMR/lazy compile (vite#22596) (#9815) by @h-a-n-a
• release: dry-run step no longer publishes binding packages (#9866) by @Boshen

Refactor

• rolldown_common: model ModuleId as a classified Path/Virtual/Bare enum (#9927) by @Boshen
• remove unused LegacyModuleIdx (#9872) by @shulaoda
• remove unused StmtInfos::get_namespace_stmt_info (#9870) by @shulaoda
• remove unused Module::as_external_mut (#9871) by @shulaoda
• remove unused EcmaAst::is_body_empty (#9869) by @shulaoda
• drop dead is_css_module handling in resolve_dependencies (#9867) by @shulaoda
• drop redundant with_commonjs on cjs source type (#9868) by @shulaoda

Documentation

• clarify on drafting PRs (#9952) by @h-a-n-a
• update contribution guidelines (#9944) by @fubhy
• note Rust crates don't follow semver in AGENTS.md (#9905) by @IWANABETHATGUY
• add feedback form (#9159) by @TheAlexLichter

Performance

• utils: avoid allocation in default_sanitize_file_name for clean names (#9928) by @Boshen
• binding: box once-per-build futures before spawn_future (#9864) by @Boshen
• utils: avoid wasted allocation in legitimize_identifier_name (#9926) by @Boshen
• rolldown: fuse the canonical-name dedup and insert in the renamer (#9900) by @Boshen
• rolldown: probe the name map once in ConflictResolver::resolve (#9899) by @Boshen
• cut two heap allocations from wrapped ESM init finalize (#9901) by @Boshen
• rolldown_plugin_vite_reporter: hoist invariant out_dir prefix out of reporter loop (#9873) by @shulaoda
• drop throwaway Vec in wrapped esm init stmt (#9878) by @shulaoda
• borrow owner_filename in build-import-analysis AddDeps (#9874) by @shulaoda

Testing

• cover preserveModules named export via namespace re-export (#6010) (#9937) by @IWANABETHATGUY

Miscellaneous Tasks

• deps: update napi to v3.9.4 (#9954) by @shulaoda
• reduce noise from CODEOWNERS for trival changes (#9953) by @h-a-n-a
• deps: update mimalloc-safe to 0.1.64 (#9950) by @shulaoda
• deps: update rollup submodule for tests to v4.62.2 (#9931) by @rolldown-guard[bot]
• deps: test mimalloc-safe upstream-mimalloc switch in CI (#9930) by @shulaoda
• rolldown_plugin_vite_build_import_analysis: remove unused v2 code path (#9917) by @shulaoda
• rolldown_plugin_vite_manifest: remove unused is_enable_v2 code path (#9916) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: remove unexposed native vite plugin (#9896) by @shulaoda
• rolldown_plugin_vite_asset: remove unexposed native vite plugin (#9895) by @shulaoda
• rolldown_plugin_vite_css_post: remove unexposed native vite plugin (#9894) by @shulaoda
• rolldown_plugin_vite_css: remove unexposed native vite plugin (#9893) by @shulaoda
• rolldown_plugin_vite_html_inline_proxy: remove unexposed native vite plugin (#9892) by @shulaoda
• rolldown_plugin_vite_html: remove unexposed native vite plugin (#9891) by @shulaoda
• deps: update github actions (#9909) by @renovate[bot]
• deps: update rust crate oxc_sourcemap to v8.0.2 (#9910) by @renovate[bot]
• deps: update npm packages (#9912) by @renovate[bot]
• deps: update github actions to v7 (#9913) by @renovate[bot]
• deps: update rolldown-plugin-dts to ^0.26.0 (#9897) by @renovate[bot]
• remove rolldown_filter_analyzer crate (#9865) by @Boshen

New Contributors

• @fubhy made their first contribution in #9944

680 Features

• add option named for invalid return type errors for more places (#9846) by @shulaoda
• add option names for invalid return type errors (#9821) by @sapphi-red
• transform: infer decorator strictNullChecks from tsconfig (#9590) by @kylecannon
• expose React Compiler options for rolldown and Vite users (#9801) by @Boshen
• tracing: gate chrome-json trace layer behind chrome-tracing feature (#9773) by @hyf0
• dev: align test-dev-server with Vite dev server (#9668) by @h-a-n-a

41b Bug Fixes

• plugin_timings: point doc link to existing checks reference page (#9837) by @hyf0
• generator: correct contradictory panic message in cjs cross-chunk symbol lookup (#9836) by @hyf0
• esm: preserve with clause on export * from external (#9796) by @hyf0
• Make external_import_binding_merger deterministic (#9755) by @naruaway
• surface invalid manualCodeSplitting group test regex as an error (#9792) by @shulaoda
• avoid panic on output.file without a file name (#9789) by @shulaoda
• avoid O(N^2) rendering of high-volume diagnostics (#9748) (#9749) by @IWANABETHATGUY
• avoid panic on JSON numbers outside f64 range (#9788) by @shulaoda
• deps: bump mimalloc-safe to 0.1.63 to fix worker_threads segfault (#9785) by @shulaoda
• cache ESM evaluation errors (#9784) by @sapphi-red
• wrap node require helper in pure IIFE (#9783) by @kb019
• lazy-barrel: load locally-used imports on a re-exported record (#9757) by @shulaoda
• avoid dangling wrapped-ESM init call across chunks (#9502) (#9717) by @IWANABETHATGUY
• dev: detect same-second rewrites in CI poll watcher (#9736) by @h-a-n-a
• dev: force rebuild after HMR errors (#9686) by @h-a-n-a
• dev: print build errors on browser refresh after a failed build (#9652) by @h-a-n-a

6de Refactor

• single-source the chunk $N symbol-naming algorithm (#9831) by @Dunqing
• simplify common_dir helper (#9857) by @IWANABETHATGUY
• drop commondir crate in favor of in-house helper (#9849) by @Boshen
• binding: extract helpers from normalize_binding_options (#9842) by @Boshen
• move rolldown_filter_analyzer to tasks and scope oxc cfg feature (#9839) by @Boshen
• options: merge manualCodeSplitting into codeSplitting object form (#9805) by @IWANABETHATGUY
• options: support codeSplitting object form in CodeSplittingMode (#9804) by @IWANABETHATGUY
• diagnostic: reuse ByteLocator for per-source line lookup (#9762) by @IWANABETHATGUY
• remove redundant Arc around tracing spans (#9778) by @camc314
• remove unnecessary Arc around sourcemap sender (#9777) by @camc314
• rolldown_plugin_vite_wasm_fallback: remove the plugin (#9775) by @sapphi-red
• binding: remove infer-able napi(ts_type) (#9737) by @sapphi-red
• remove preprocessor span dedup (#9734) by @hyf0
• identify AST nodes by NodeId instead of Span/Address (#9609) by @IWANABETHATGUY

4da Documentation

• tsconfig: align auto-discovery docs with oxc-resolver behavior (#9845) by @shulaoda
• relocate meta/design to internal-docs, split design from implementation (#9826) by @h-a-n-a
• meta: add options normalization design doc (#9818) by @IWANABETHATGUY
• document why the napi tracing feature is enabled (#9766) by @Boshen
• dev: move test-dev-server test guidance into the testing docs (#9809) by @h-a-n-a

4a1 Performance

• drop unused regex unicode property tables from the binding (#9848) by @Boshen
• drop urlencoding crate in favor of percent-encoding (#9851) by @Boshen
• drop owo-colors supports-colors feature in vite reporter (#9824) by @Boshen
• skip enum member value extraction for non-TypeScript modules (#9840) by @shapphi-red
• rolldown: use unstable sort for itertools sorted_by at unique-key sites (#9827) by @Boshen
• cheaper deterministic ordering in external import binding merger (#9810) by @IWANABETHATGUY
• disable idna's ICU backend by pinning idna_adapter to 1.0.0 (-129 KB) (#9811) by @Boshen
• size: use unstable sort where stability is unneeded (#9803) by @Boshen
• remove num-format dependency from vite reporter (#9795) by @Boshen
• reduce js callback error size (#9776) by @Boshen
• rolldown_error: remove Debug supertrait from BuildEvent (#9798) by @Boshen
• reduce plugin hook order code size (#9761) by @Boshen
• deps: disable infer default features to reduce binary size (#9765) by @Boshen
• reduce pluginable monomorphization size (#9771) by @Boshen
• avoid rebuilding replace plugin values (#9764) by @Boshen
• defer link-stage-output drop to rayon workers after output is produced (#9733) by @Brooooooklyn
• tree-shaking: hoist already-included guard to call sites in inclusion DFS (#9738) by @Brooooooklyn
• renamer: dedup before allocating the owned name in add_symbol_in_root_scope (#9740) by @Brooooooklyn

9ea Testing

• allocs: track allocation counts for rolldown_sourcemap (#9835) by @hyf0
• bench: add CodSpeed micro-benchmarks for rolldown_sourcemap (#9834) by @hyf0
• add cjs named export mutation test (#9823) by @sapphi-red
• dev: restore shared-page reliability conventions in AGENTS.md (#9786) by @h-a-n-a
• dev: add AGENTS.md test guidance for agents (#9763) by @h-a-n-a
• dev: split out initial-build-error into its own playground (#9772) by @h-a-n-a
• dev: align e2e suite with Vite and parallelize playgrounds (#9759) by @h-a-n-a
• remove unnecessary module namespace object JSON serializations in tests (#9725) by @sapphi-red
• use assert.deepStrictEqual instead of assert.deepEqual by using assert/strict instead of assert (#9724) by @sapphi-red
• hmr: add test case for #5301 (#5302) by @sapphi-red
• dev: add tests for dev-engine principles (#9720) by @h-a-n-a
• dev: align dev-engine test harness with Vite (#9684) by @h-a-n-a

6e0 Miscellaneous Tasks

• deps: update napi to 3.9.3 (#9862) by @shulaoda
• deps: update oxc to 0.137.0 (#9856) by @Boshen
• re-enable default lld linker on x86_64-unknown-linux-gnu (#9855) by @Boshen
• deps: bump vite-plus to 0.2.1 (#9850) by @Boshen
• skills: translate _config.json when encoding rolldown REPL links (#9847) by @IWANABETHATGUY
• deps: update oxc_resolver and oxc_resolver_napi to 11.21.3 (#9841) by @Boshen
• pin vite-plus (vp) CLI to 0.1.24 in setup-vp (#9830) by @Boshen
• add crate/package-level CODEOWNERS (#9819) by @IWANABETHATGUY
• drop unused derive_more display feature from rolldown_plugin (#9820) by @Boshen
• remove auto-assign PR workflow (#9807) by @IWANABETHATGUY
• deps: update rollup submodule for tests to v4.62.0 (#9780) by @rolldown-guard[bot]
• deps: update esbuild for tests to 0.28.1 (#9779) by @rolldown-guard[bot]
• deps: update test262 submodule for tests (#9781) by @rolldown-guard[bot]
• deps: update oxc to 0.136.0 (#9770) by @Boshen
• add pull request template (#9756) by @sapphi-red
• clarify rolldown_plugin_vite_* is compatible for the same minor (#9774) by @sapphi-red
• deps: update github actions (#9745) by @renovate[bot]
• deps: update rust crates (#9747) by @renovate[bot]
• deps: update napi to v3.9.2 (#9744) by @renovate[bot]
• deps: update npm packages (#9746) by @renovate[bot]
• deps: update @napi-rs/cli and emnapi deps (#9741) by @Brooooooklyn
• generator: fix vp fmt on Windows (#9727) by @sapphi-red
• ban importing from assert and recommend assert/strict (#9726) by @sapphi-red

49c New Contributors

• @naruaway made their first contribution in #9755
• @kb019 made their first contribution in #9783

680 Features

• ecmascript_utils: introduce AstFactory for AST construction (#9682) by @hyf0
• drop no-op init calls for empty wrapped-ESM modules (#9678) by @IWANABETHATGUY

41b Bug Fixes

• resolver: honor package.json#type for .jsx/.tsx extensions (#9690) (#9699) by @IWANABETHATGUY
• hmr: report the full-reload reason for the invalidate-loop case (#9708) by @hyf0
• explicit moduleSideEffects from a hook must take priority over the package.json#sideEffects (#9688) by @sapphi-red
• keep the rolldown-runtime name for the standalone runtime chunk (#9685) by @shulaoda
• lazy-barrel: request all exports for entry barrels on first encounter (#9672) by @shulaoda
• finalizer: skip init_*() for tree-shaken wrapped ESM owners (#9669) by @IWANABETHATGUY
• order chunk.imports by execution order (#9654) by @chuganzy
• vite-resolve: preserve slash separators for Sass partial exports (#9546) by @cjc0013
• cross-chunk CJS wrapper shadowed by author-local binding (#9648) by @IWANABETHATGUY

6df Refactor

• precompute wrapped-ESM init metadata in generate stage (#9712) by @IWANABETHATGUY
• ecmascript_utils: fold construction ext traits onto AstFactory and delete AstSnippet (#9702) by @hyf0
• finalizer: finish ScopeHoistingFinalizer migration to AstFactory (#9701) by @hyf0
• finalizer: migrate module_finalizers/mod.rs to AstFactory (#9700) by @hyf0
• hmr: migrate hmr finalizer to AstFactory (#9695) by @hyf0
• plugin: migrate vite_build_import_analysis to AstFactory (#9693) by @hyf0
• scanner: migrate tweak_ast_for_scanning to AstFactory (#9683) by @hyf0
• always split runtime module first (#9419) by @IWANABETHATGUY

4da Documentation

• tsconfig: correct auto-discovery resolution to match TypeScript (#9714) by @shulaoda
• design: plan to unify all internal AST construction (#9673) by @hyf0
• tsconfig: align reference resolution docs with TypeScript behavior (#9641) by @shulaoda

4a1 Performance

• avoid per-module join Strings in scope-hoisting concatenation (#9645) by @Boshen
• avoid intermediate Strings in the ESM export clause (#9644) by @Boshen
• reuse a scratch buffer for facade namespace names in the scanner (#9642) by @Boshen
• reuse the import-matching tracker stack across named imports (#9643) by @Boshen
• avoid cloning the per-chunk export-items map in render_chunk_exports (#9639) by @Boshen
• avoid CompactStr allocation in sorted-exports membership check (#9640) by @Boshen

9ea Testing

• add more moduleSideEffects precedence tests (#9689) by @sapphi-red
• 9651: drop shimMissingExports from regression fixture (#9674) by @IWANABETHATGUY

6e0 Miscellaneous Tasks

• update react repo links (#9711) by @iiio2
• remove outdated pnpm configurations (#9666) by @btea
• deps: update github actions to v2.81.5 (#9665) by @renovate[bot]
• testing: migrate test harness off deprecated inlineDynamicImports (#9710) by @IWANABETHATGUY
• hmr: delete commented-out dead code left from old register-module codegen (#9707) by @hyf0
• deps: update napi-rs toolchain (#9706) by @shulaoda
• deps: update rollup submodule for tests to v4.61.1 (#9676) by @rolldown-guard[bot]
• deps: update test262 submodule for tests (#9677) by @rolldown-guard[bot]
• deps: update oxc to 0.135.0 (#9670) by @Boshen
• pass ALGOLIA_APP_ID and ALGOLIA_API_KEY to void deploy (#9667) by @Boshen
• deps: update github actions (#9662) by @renovate[bot]
• deps: update rust crates (#9663) by @renovate[bot]
• deps: update rolldown-plugin-dts to v0.25.2 (#9661) by @renovate[bot]
• deps: update typos to v1.47.2 (#9660) by @renovate[bot]
• deps: update docs dependencies (#9657) by @bddjr
• deps: update typos to v1.47.1 (#9655) by @renovate[bot]
• deps: update npm packages (#9653) by @renovate[bot]
• deps: update dependency @napi-rs/cli and emnapi deps (#9652) by @Brooooooklyn
• generator: fix vp fmt on Windows (#9627) by @sapphi-red
• ban importing from assert and recommend assert/strict (#9626) by @sapphi-red

49c New Contributors

• @chuganzy made their first contribution in #9654
• @cjc0013 made their first contribution in #9546

🚀 Features

• enable experimental.lazyBarrel by default (#9632) by @shulaoda
• import.meta.glob support caseSensitive option (#9594) by @btea
• add SOURCEMAP_BROKEN warning for renderChunk hook (#9601) by @sapphi-red
• add SOURCEMAP_BROKEN warning for transform hook (#9600) by @sapphi-red
• add @__NO_SIDE_EFFECTS__ hint for invalid @__PURE__ before function declarations (#9505) by @Copilot
• code-splitting: support group-local includeDependenciesRecursively (#9587) by @hyf0

🐛 Bug Fixes

• report TSCONFIG_ERROR instead of UNHANDLEABLE_ERROR for a missing tsconfig file (#9633) by @shulaoda
• browser: add missing exports and ensure consistency with rolldown package (#9629) by @sapphi-red
• should build test-dev-server when test-node (#9610) by @situ2001
• chunk-optimizer: refuse asymmetric merge for cyclic dynamic entries (#9320) (#9322) by @aminpaks
• dev: handle the remaining errors in dev (#9570) by @h-a-n-a
• handle slash-normalized ids with preserveModulesRoot (#9595) by @IWANABETHATGUY
• json: preserve .default access on JSON default imports (#9568) by @IWANABETHATGUY
• testing: remove unintended trigger_full_build from test harness (#9573) by @hyf0

🚜 Refactor

• js-regex: use regress native replace/replace_all (#9607) by @IWANABETHATGUY
• remove never-constructed ImportStatus variants (#9606) by @Boshen

📚 Documentation

• clarify that RolldownBuild::close method should be called in most cases (#9619) by @sapphi-red

⚡ Performance

• avoid unnecessary intermediate sourcemaps (#9599) by @sapphi-red

🧪 Testing

• add unit test for collapsing module sourcemap (#9626) by @sapphi-red
• cover vite-alias regex capture-group expansion (#9602) (#9608) by @IWANABETHATGUY

⚙️ Miscellaneous Tasks

• deps: update oxc_resolver to 11.21.0 (#9634) by @shulaoda
• update invalid option diagnostic link to point to Rolldown docs (#9631) by @sapphi-red
• deps: update vite+ to v0.1.24 (#9628) by @renovate[bot]
• deps: update oxc resolver to v11.20.0 (#9549) by @renovate[bot]
• deps: update dependency vite-plus to v0.1.24 (#9470) by @renovate[bot]
• deps: update npm packages (#9614) by @renovate[bot]
• deps: upgrade oxc to 0.134.0 (#9625) by @shulaoda
• deps: update crate-ci/typos action to v1.47.0 (#9620) by @renovate[bot]
• deps: update rollup submodule for tests to v4.61.0 (#9623) by @rolldown-guard[bot]
• deps: update github actions (#9613) by @renovate[bot]
• deps: update pnpm to v11.4.0 (#9616) by @renovate[bot]
• deps: update rust crates (#9615) by @renovate[bot]
• deps: update test262 submodule for tests (#9624) by @rolldown-guard[bot]
• deps: update dependency @napi-rs/cli to v3.7.0 (#9588) by @renovate[bot]
• deps: update dependency rust to v1.96.0 (#9596) by @renovate[bot]
• re-enable WASI testing with proper infrastructure (#9397) by @Boshen

❤️ New Contributors

• @aminpaks made their first contribution in #9322

680 Features

• transform: respect decorator strictNullChecks option (#9580) by @kylecannon
• drop defer keyword (#9503) by @TheAlexLichter

42b Bug Fixes

• ci: create target dir before cargo release-oxc update (#9584) by @shulaoda
• ci: reorder prepare-release steps to avoid dirty git check failure (#9583) by @shulaoda
• testing: canonicalize temp dir early and use platform-specific separator in test262 (#9582) by @shulaoda
• testing: resolve symlinked temp dir in test262 snapshot normalization (#9581) by @shulaoda
• testing: canonicalize temp dir path in test262 snapshot normalization (#9579) by @shulaoda
• dev: onOutput called twice when initial build fails (#9552) by @hyf0
• dev: make ensureCurrentBuildFinish not returning error when engine closes (#9564) by @h-a-n-a
• oxc-runtime: route require() to CJS helper variant (#9263) (#9526) by @IWANABETHATGUY
• generator: use exporter chunk's export mode for CJS default re-exports (#9299) (#9529) by @IWANABETHATGUY
• rolldown: always run reduced-atom static cycle check (#9441) (#9514) by @IWANABETHATGUY
• apply transform.dropLabels before scanning (#9521) (#9522) by @IWANABETHATGUY
• rolldown_watcher: take rolldown dep through the workspace (#9510) by @Boshen
• cache: keep the scan-stage cache consistent when a build fails (#9495) by @h-a-n-a
• skip JSON default-import namespace optimization for write targets (#9484) (#9489) by @IWANABETHATGUY
• deps: skip pnpm frozen-lockfile on Netlify to dodge catalog mismatch bug (#9471) by @Boshen

6dc Refactor

• oxc-runtime: use Cow for helper path construction (#9538) by @IWANABETHATGUY
• fold import defer phase drop into PreProcessor (#9524) by @IWANABETHATGUY
• distinguish map: null vs map: undefined in transform hook output (#9497) by @sapphi-red

4da Documentation

• explain the policy for Rust crates (#9547) by @sapphi-red
• cache: add design doc for cache (#9544) by @h-a-n-a
• guide/troubleshooting: add TDZ error section (#9537) by @sapphi-red
• dev-engine: add design doc for dev-engine (#9479) by @h-a-n-a
• lazy-barrel: tweak some words (#9483) by @shulaoda
• lazy-barrel: expand reasoning behind LARGE_BARREL_MODULES advice (#9477) by @shulaoda

4a8 Performance

• generate: thread ast_table by value into codegen consumer (#9555) by @Boshen
• finalizers: replace _reExport construction with a direct call to avoid calling clone_in (#9501) by @Dunqing
• reorder hot-path boolean checks to short-circuit on cheap predicates first (#9523) by @Boshen

9ea Testing

• rolldown: regression fixture for #9401 (#9418) by @IWANABETHATGUY
• failing test for #9441 (#9504) by @TheAlexLichter

699 Miscellaneous Tasks

• deps: upgrade oxc to 0.133.0 (#9563) by @Dunqing
• deps: update crate-ci/typos action to v1.46.3 (#9576) by @renovate[bot]
• deps: update mimalloc-safe to 0.1.62 (#9577) by @shulaoda
• mimalloc-safe: update to a bug-fix branch for verification (#9569) by @shulaoda
• deps: update test262 submodule for tests (#9551) by @rolldown-guard[bot]
• point published crates' readme to root README.md (#9553) by @Boshen
• replace actions-cool/issues-helper with gh CLI (#9543) by @Boshen
• deps: update cargo-shear to 1.12.4 (#9541) by @Boshen
• deps: update taiki-e/install-action action to v2.79.4 (#9535) by @renovate[bot]
• deps: update github actions (#9532) by @renovate[bot]
• deps: update rust crates (#9534) by @renovate[bot]
• deps: update npm packages (#9533) by @renovate[bot]
• gate experimental/testing-only items to silence dead_code in publish builds (#9517) by @Boshen
• docs: deploy to Void (#9509) by @Boshen
• release: set up cargo-release-oxc for publishing crates (#9476) by @Boshen
• rolldown_plugin_lazy_compilation: add missing description (#9507) by @Boshen
• mimalloc-safe: update to a bug-fix branch for verification (#9506) by @shulaoda
• deps: update crate-ci/typos action to v1.46.2 (#9468) by @renovate[bot]

764 New Contributors

• @kylecannon made their first contribution in #9580

🚀 Features

• devtools: emit package size in PackageGraphReady (#9434) by @IWANABETHATGUY
• devtools: classify package dependency types (#9427) by @IWANABETHATGUY
• devtools: map packages to modules and chunks (#9426) by @IWANABETHATGUY
• devtools: mark used packages (#9423) by @IWANABETHATGUY
• devtools: make duplicate packages discoverable (#9422) by @IWANABETHATGUY
• devtools: emit package metadata (#9421) by @IWANABETHATGUY
• update oxc to 0.132.0 (#9449) by @shulaoda
• update oxc to 0.131.0 (#9424) by @shulaoda
• allow checks.* to escalate emissions to hard errors (#9388) by @IWANABETHATGUY
• dev: support watcher options include and exclude (#9395) by @h-a-n-a
• emit warnings for invalid pure annotations (#9381) by @Kyujenius

🐛 Bug Fixes

• hash: keep chunk file names stable when an unrelated entry is added (#9444) by @hyf0
• call codeSplitting.groups[].name in deterministic order (#9457) by @sapphi-red
• dev/lazy: make resolve_id idempotent when the resolved id is already a lazy entry (#9439) by @h-a-n-a
• chunk-optimization: publish absorbed dynamic-entry namespace cross-chunk (#9448) by @IWANABETHATGUY
• treeshake: propagate pure annotation through compound exprs (#9431) by @Dunqing
• finalizer: skip redundant init call when barrel executes in same chunk (#9354) by @IWANABETHATGUY
• linking: initialize wrapped ESM re-export owners (#9353) by @IWANABETHATGUY
• do not inherit __toESM across chunks for named-only external imports (#9333) (#9415) by @IWANABETHATGUY
• watcher: don't write output or emit events after close() (#9328) by @situ2001
• chunk-optimization: avoid unsafe dynamic-only merges (#9398) by @IWANABETHATGUY
• cjs: rename CJS-wrapped locals that would shadow chunk-scope names (#9392) by @hyf0
• dev/lazy: watch lazy modules added in rebuilds (#9391) by @h-a-n-a

🚜 Refactor

• rolldown_dev: move dev example to break publish cycle (#9465) by @Boshen
• binding: drop unsafe napi string helper, hoist transform ArcStr (#9456) by @hyf0
• ecmascript_utils: split rewrite_ident_reference off JsxExt trait (#9417) by @IWANABETHATGUY
• use ThreadsafeFunction::call_async_catch (#9390) by @sapphi-red

📚 Documentation

• devtools: document @rolldown/debug usage and package graph consumption (#9435) by @IWANABETHATGUY
• replace Inter with system font stack in OG template SVG (#9240) by @yvbopeng
• remove output.comments warning as all issues have been resolved (#9393) by @sapphi-red
• in-depth: clarify @PURE scope and document positions (#9389) by @Kyujenius
• readme: remove release candidate notice (#9387) by @shulaoda

⚡ Performance

• vite-resolve: cache importer existence checks (#9443) by @Brooooooklyn
• binding: reduce plugin string clones (#9436) by @Brooooooklyn

🧪 Testing

• enable legal_comments_inline test (#9394) by @sapphi-red

⚙️ Miscellaneous Tasks

• bump pnpm to v11.1.2 (#9447) by @Boshen
• deps: update rust crates (#9461) by @renovate[bot]
• deps: update rollup submodule for tests to v4.60.4 (#9453) by @rolldown-guard[bot]
• deps: update test262 submodule for tests (#9454) by @rolldown-guard[bot]
• deps: update npm packages (#9430) by @renovate[bot]
• deps: update github actions (#9429) by @renovate[bot]
• deps: update dependency rolldown-plugin-dts to v0.25.1 (#9452) by @renovate[bot]
• deps: update rust crates (#9428) by @renovate[bot]
• revert allow checks.* to escalate emissions to hard errors (#9388) (#9438) by @IWANABETHATGUY
• update mimalloc-safe to 0.1.61 (#9413) by @shulaoda
• deny todo, unimplemented, and print_stderr clippy lints (#9412) by @Boshen
• deps: update mimalloc-safe to 0.1.60 (#9410) by @shulaoda
• remove pip install setuptools workaround for node-gyp on macOS (#9370) by @sapphi-red
• renovate: disable automerge to require manual approval (#9386) by @shulaoda
• deps: update napi (#9385) by @renovate[bot]

❤️ New Contributors

• @yvbopeng made their first contribution in #9240

Features

• experimental/lazy-barrel: advice on oversized barrel modules (#9236) by @shulaoda
• rolldown: inline optional-chain enum access (#9379) by @Dunqing
• chunk-optimization: dedupe already-loaded dynamic deps (#9305) by @IWANABETHATGUY
• binding: call moduleParsed hook in ParallelJsPlugin (#9318) by @jaehafe

Bug Fixes

• transform: enable enum_eval for transformSync and vite TS transform (#9325) by @Dunqing
• error: remove severity prefix from diagnostic messages (#9262) by @Kyujenius
• deps: pin pnpm to 10.23.0 to work around catalog mismatch on Netlify (#9364) by @shulaoda
• ci: pin mimalloc-safe to 0.1.58 (#9361) by @shulaoda
• dev/lazy: fix exports of lazy requests in lazy chunks (#9249) by @h-a-n-a
• rolldown_plugin_vite_resolve: handle errors in resolveSubpathImports callback (#9355) by @sapphi-red
• rolldown_plugin_lazy_compilation: use loadExports for fetched proxy to preserve original export names (#9132) by @h-a-n-a
• common: include offending index in HybridIndexVec panic message (#9296) by @SAY-5

Refactor

• ecmascript: extract semantic_builder_for_transform helper (#9326) by @Dunqing
• test: extract reusable static-import-cycle helper (#9332) by @IWANABETHATGUY

Documentation

• clarify scope of topLevelVar (#9380) by @IWANABETHATGUY
• meta/design: add ast-mutation design doc (#9338) by @hyf0
• feat: add ai policy in contribution guide (#9315) by @mdong1909

Performance

• binding: enable mimalloc v3 to reduce idle memory (#9349) by @shulaoda

Testing

• mcs: cover require() in $initial group (#9376) by @hyf0
• add regression for CJS facade chunk merge into entry (#9351) by @IWANABETHATGUY

Miscellaneous Tasks

• switch prepare-release to manual dispatch with version input (#9383) by @shulaoda
• migrate @rolldown/pluginutils to rolldown/plugins (#9317) by @shulaoda
• deps: pin libmimalloc-sys2 to 0.1.54 (#9372) by @shulaoda
• replace igorskyflyer/action-readfile with cat (#9369) by @sapphi-red
• deps: update test262 submodule for tests (#9371) by @rolldown-guard[bot]
• use app token for test dep update PRs (#9368) by @sapphi-red
• replace some actions with gh commands (#9367) by @sapphi-red
• replace action-semantic-pull-request with inline regex (#9366) by @sapphi-red
• remove pull_request_target workflows (#9188) by @Boshen
• deps: upgrade oxc to 0.130.0 (#9360) by @shulaoda
• deps: update github actions (major) (#9348) by @renovate[bot]
• deps: update github actions (#9341) by @renovate[bot]
• deps: update rust crates (#9344) by @renovate[bot]
• deps: update crate-ci/typos action to v1.46.1 (#9357) by @renovate[bot]
• deps: update npm packages (#9343) by @renovate[bot]
• deps: update pnpm to v10.33.4 (#9347) by @renovate[bot]
• deps: update dependency rolldown-plugin-dts to ^0.25.0 (#9346) by @renovate[bot]
• .claude: add rolldown-repl encoder, rename decode skill (#9352) by @IWANABETHATGUY
• deps: update crate-ci/typos action to v1.46.0 (#9345) by @renovate[bot]
• deps: update napi to v3.8.6 (#9342) by @renovate[bot]

New Contributors

• @Kyujenius made their first contribution in #9262
• @SAY-5 made their first contribution in #9296
• @thescripted made their first contribution in #9324

42b Bug Fixes

• dev/lazy: lazily compiled modules should be watched (#9301) by @h-a-n-a
• implement dynamic dominator merge logic (#9270) by @TheAlexLichter
• dev: apply __toCommonJS interop when CJS requires ESM in HMR finalizer (#9261) by @h-a-n-a

6dc Refactor

• ecma_ast: tighten allocator access to enforce Sync invariant (#9278) by @IWANABETHATGUY
• scan_stage: remove stmt_infos field from EcmaView (#9276) by @IWANABETHATGUY
• link_stage: detach stmt_infos from EcmaView (#9274) by @IWANABETHATGUY
• link_stage: detach depended_runtime_helper from EcmaView to remove unsafe (#9265) by @IWANABETHATGUY
• link_stage: remove unsafe in determine_module_exports_kind (#9253) by @IWANABETHATGUY

4da Documentation

• getting-started: remove RC warning for 1.0.0 release (#9310) by @shulaoda
• getting-started: update version references for 1.0.0 release (#9309) by @shulaoda
• add Vite+ tab to getting-started snippets (#9285) by @shulaoda
• lazy-barrel: clarify own-exports behavior for import-then-export records (#9298) by @shulaoda
• restructure top navigation around Learn vs Reference (#9284) by @shulaoda
• builtin-plugins: add bundle analyzer plugin docs (#9292) by @shulaoda
• design doc for reference_needed_symbols (#9264) by @IWANABETHATGUY

4a8 Performance

• devtools: write logs on a background thread (#9219) by @IWANABETHATGUY

699 Miscellaneous Tasks

• mark esbuild/ts/parameter_props_use_define_for_class_fields_true as passed (#9308) by @sapp-hi-red
• deps: upgrade oxc to 0.129.0 (#9297) by @shulaoda
• deps: update rollup submodule for tests to v4.60.3 (#9294) by @sapp-hi-red
• deps: update test262 submodule for tests (#9295) by @sapp-hi-red
• ai: add rolldown REPL decode skill (#9245) by @Dunqing

764 New Contributors

• @thezzisu made their first contribution in #9101
• @fpotter made their first contribution in #9086
• @jaehafe made their first contribution in #9071
• @privatenumber made their first contribution in #8993

BREAKING CHANGES

• optimization: default unspecified inlineConst.mode to smart (#9248) by @IWANABETHATGUY

Bug Fixes

• rolldown_plugin_vite_import_glob: return error instead of panicking when virtual module uses a relative glob (#9241) by @shulaoda
• binding: treat empty inlineConst object as omitted (#9247) by @IWANABETHATGUY
• rolldown: keep enum declaration for optional-chain access (#9229) by @Dunqing
• link_stage: restore inline let-else in exports-kind filter (#9237) by @IWANABETHATGUY
• dev/lazy: avoid module reinitialization in lazy compilation patches (#9179) by @h-a-n-a
• dev: visit identifier references for runtime rewrites in HMR finalizer (#9191) by @h-a-n-a
• chunk-optimizer: pick dominator for runtime placement to avoid cycles (#9164) by @IWANABETHATGUY
• make this.emitFile chunk path synchronous to avoid deadlock (#9031) by @lazarv
• use sentinel id for browser: false ignored modules (#9192) by @shulaoda
• prevent chunk optimizer from creating import cycles (#9228) by @IWANABETHATGUY

Refactor

• replace tokio::sync::Mutex with std::sync::Mutex for non-IO data (#9176) by @shulaoda
• rolldown_plugin_vite_import_glob: do not rewrite import path for absolute base (#9195) by @shulaoda
• runtime_helper: wrap DependedRuntimeHelperMap in a struct (#9215) by @IWANABETHATGUY
• drop redundant clear() in determine_safely_merge_cjs_ns (#9206) by @IWANABETHATGUY
• clean up generate_lazy_export (#9208) by @IWANABETHATGUY
• bitset: return bool from set_bit to fuse guard-and-set (#9207) by @IWANABETHATGUY
• link_stage: simplify exports-kind filter and clarify safety comments (#9205) by @IWANABETHATGUY

Documentation

• determine_module_exports_kind (#9252) by @IWANABETHATGUY
• fix dead link to esbuild ESM/CJS interop tests (#9230) by @Copilot
• remove CSS bundling references (#9234) by @shulaoda
• correct IncrementalFullBuild row in BundleMode table (#9214) by @IWANABETHATGUY
• design: add bundler data lifecycle design doc (#9212) by @hyf0
• remove minifier alpha status notices (#9202) by @sapphi-red

Miscellaneous Tasks

• upgrade oxc to 0.128.0 (#9260) by @shulaoda
• deps: bump rolldown-ariadne to 0.6.0 (#9254) by @IWANABETHATGUY
• deps: update github actions (#9259) by @renovate[bot]
• deps: update github actions (#9258) by @renovate[bot]
• remove renovate overrides (#9257) by @Boshen
• use ubuntu-latest for security workflow (#9256) by @Boshen
• notify Discord around release publish (#9251) by @Boshen
• add release environment to npm publish workflow (#9250) by @Boshen
• justfile: drop the -- separator before forwarded args in vp run (#9246) by @shulaoda
• deps: update test262 submodule for tests (#9243) by @sapphi-red
• add more tracing instrumentations (#9220) by @sapphi-red
• rolldown_plugin_vite_import_glob: remove outdated sourcemap doc comment (#9213) by @shulaoda
• update security workflow (#9201) by @Boshen

New Contributors

• @lazarv made their first contribution in #9031

🐛 Bug Fixes

• link: error on missing export between TS modules (#9197) by @IWANABETHATGUY
• rolldown_plugin_vite_import_glob: import path should not be affected by absolute base option (#9145) by @kermanx
• this.resolve() returns null for bare relative paths without importer (#9142) by @Copilot
• collect destructured bindings in HMR module exports (#9146) by @h-a-n-a
• esbuild-tests: handle 0.28.0 test cases (#9149) by @sapphi-red
• plugin/copy-module: honor external resolutions from other plugins (#9139) by @TheAlexLichter
• allow undefined in sourcesContent type (#9136) by @jurijzahn8019
• reduce false positives in chunk optimizer circular dependency detection (#9049) by @AlonMiz

🚜 Refactor

• chunk-optimizer: extract runtime-module placement into rehome_runtime_module (#9163) by @IWANABETHATGUY

📚 Documentation

• add design doc for sort_modules execution ordering (#9169) by @IWANABETHATGUY
• add document for RenderedModule (#9147) by @sapphi-red

⚡ Performance

• rolldown_plugin_vite_import_glob: skip self-import earlier using raw path comparison (#9193) by @shulaoda

🧪 Testing

• lazy: add playground/lazy-compilation (#7974) by @hyf0

⚙️ Miscellaneous Tasks

• use app token for release PR (#9198) by @Boshen
• upgrade oxc to 0.127.0 (#9194) by @Dunqing
• use oxc security action (#9196) by @Boshen
• esbuild-tests: remove some tests from ignored list as enum inline is now supported (#9184) by @sapphi-red
• deps: update dependency vite-plus to v0.1.19 (#9183) by @renovate[bot]
• use vp instead of pnpm in check-wasi-binding-deps (#9182) by @shulaoda
• verify wasm32-wasi binding deps match @rolldown/browser before publish (#9162) by @shulaoda
• deps: update esbuild for tests to 0.28.0 (#9172) by @sapphi-red
• deps: update rollup submodule for tests to v4.60.2 (#9173) by @sapphi-red
• deps: update test262 submodule for tests (#9174) by @sapphi-red
• sort_modules: fix stale async-entry sort key comment (#9170) by @IWANABETHATGUY
• deps: update npm packages (#9157) by @renovate[bot]
• deps: update dependency diff to v9 (#9158) by @renovate[bot]
• deps: update rust crates (#9156) by @renovate[bot]
• run Windows CI on PRs labeled with ci: windows (#9153) by @hyf0
• update-test-dependencies: run setup-rust before file changes (#9151) by @sapphi-red
• deps: update dependency rust to v1.95.0 (#9140) by @renovate[bot]

❤️ New Contributors

• @jurijzahn8019 made their first contribution in #9136
• @AlonMiz made their first contribution in #9049

🚀 Features

• const enum cross-module inlining support (#8796) by @Dunqing
• implement module tagging system for code splitting (#9045) by @hyf0

🐛 Bug Fixes

• rolldown_plugin_vite_manifest: handle duplicate chunk names for CSS entries (#9059) by @sapphi-red
• improve error message for invalid return values in function options (#9125) by @shulaoda
• await async export-star init wrappers (#9101) by @thezzisu
• never panic during diagnostic emission (#9091) by @IWANABETHATGUY
• include array rest pattern in binding_identifiers (#9112) by @IWANABETHATGUY
• rolldown: set worker thread count with ROLDOWN_WORKER_THREADS (#9086) by @fpotter
• rolldown_plugin_lazy_compilation: escape request ID in proxy modules (#9102) by @h-a-n-a
• treat namespace member access as side-effect-free (#9099) by @IWANABETHATGUY
• relax overly conservative side-effect leak check in chunk optimizer (#9085) by @IWANABETHATGUY
• runtime: release cb reference after __commonJS factory initialization (#9067) by @hyf0-agent
• @__NO_SIDE_EFFECTS__ wrapper should not remove dynamic imports (#9075) by @IWANABETHATGUY
• rolldown_plugin_vite_import_glob: use POSIX path join/normalize for glob resolution (#9077) by @shulaoda
• emit REQUIRE_TLA error when require() loads a module with top-level await (#9071) by @jaehafe
• emit namespace declaration for empty modules in manual chunks (#8993) by @privatenumber
• rolldown_plugin_vite_import_glob: keep common base on path segment boundary (#9070) by @shulaoda
• prevent circular runtime helper imports during facade elimination (#8989) (#9057) by @IWANABETHATGUY
• correct circular dependency check in facade elimination (#9047) by @h-a-n-a
• docs: correct dead link in CodeSplittingGroup.tags JSDoc (#9051) by @hyf0
• emit DUPLICATE_SHEBANG warning when banner contains shebang (#9026) by @IWANABETHATGUY

🚜 Refactor

• use semantic reference flags for member write detection (#9060) by @Dunqing
• extract UsedSymbolRefs newtype wrapper (#9130) by @IWANABETHATGUY
• dedupe await wrapping in export-star init emit (#9119) by @IWANABETHATGUY
• calculate side-effect-free function symbols on demand (#9120) by @IWANABETHATGUY
• extract duplicated top-level await handling into shared helper (#9087) by @IWANABETHATGUY
• rolldown_plugin_vite_import_glob: use split_first for get_common_base (#9069) by @shulaoda
• simplify ESM init deduplication with idiomatic insert check (#9044) by @IWANABETHATGUY

📚 Documentation

• document runtime module placement strategy in code-splitting design (#9062) by @IWANABETHATGUY
• clarify options hook behavior difference with Rollup in watch mode (#9053) by @sapphi-red
• meta/design: introduce module tags (#9017) by @hyf0

⚡ Performance

• convert generate_transitive_esm_init to iterative (#9046) by @IWANABETHATGUY

🧪 Testing

• merge strict/non_strict test variants using configVariants (#9089) by @IWANABETHATGUY

⚙️ Miscellaneous Tasks

• disable Renovate auto-updates for oxc packages (#9129) by @IWANABETHATGUY
• upgrade [email protected] (#9127) by @Dunqing
• deps: update napi to v3.8.5 (#9126) by @renovate[bot]
• deps: update dependency @napi-rs/cli to v3.6.2 (#9123) by @renovate[bot]
• move lazy-compilation design doc (#9117) by @h-a-n-a
• deps: update dependency vite-plus to v0.1.18 (#9118) by @renovate[bot]
• deps: update dependency vite-plus to v0.1.17 (#9113) by @renovate[bot]
• deps: update oxc to v0.125.0 (#9094) by @renovate[bot]
• deps: update dependency follow-redirects to v1.16.0 [security] (#9103) by @renovate[bot]
• deps: update test262 submodule for tests (#9097) by @sapphi-red
• deps: update crate-ci/typos action to v1.45.1 (#9096) by @renovate[bot]
• deps: update rust crates (#9081) by @renovate[bot]
• deps: update npm packages (#9080) by @renovate[bot]
• remove outdated TODO in determine_module_exports_kind (#9072) by @jaehafe
• rust/test: support extendedTests: false shorthand in test config (#9050) by @hyf0
• ci: extract shared infra-changes anchor in path filters (#9054) by @hyf0
• add docs build check to catch dead links in PRs (#9052) by @hyf0

❤️ New Contributors

• @thezzisu made their first contribution in #9101
• @fpotter made their first contribution in #9086
• @jaehafe made their first contribution in #9071
• @privatenumber made their first contribution in #8993