Rolldown Release Notes

BREAKING CHANGES

• tsconfig: enable auto-discovery by default (#7817) by @shulaoda

Features

• distinguish transformer diagnostics from parse errors (#7872) by @shulaoda
• emit transformer warnings instead of ignoring them (#7850) by @shulaoda
• node: add output.codeSplitting option and deprecate output.advancedChunks (#7855) by @hyf0
• nativeMagicString reset (#7828) by @IWANABETHATGUY
• nativeMagicString lastChar (#7819) by @IWANABETHATGUY
• dev/lazy: inject lazy compilation runtime automatically (#7816) by @hyf0
• nativeMagicString snip (#7818) by @IWANABETHATGUY
• nativeMagicString construct with options (#7814) by @IWANABETHATGUY
• nativeMagicString clone (#7813) by @IWANABETHATGUY
• nativeMagicString insert (#7812) by @IWANABETHATGUY
• nativeMagicString slice (#7807) by @IWANABETHATGUY
• nativeMagicString trim methods (#7800) by @IWANABETHATGUY
• make closeBundle hook receive the last error (#7278) by @Copilot

Bug Fixes

• when package only contains export default, cjsDefault didn't resolve correctly (#7873) by @IWANABETHATGUY
• inline __name calls for default exports (#7862) by @IWANABETHATGUY
• improve variable renaming to avoid unnecessary shadowing in nested scopes (#7859) by @IWANABETHATGUY
• use correct index when inserting keepNames statements during export default transformation (#7853) by @IWANABETHATGUY
• transform non-static dynamic imports when dynamicImportInCjs is false (#7823) by @shulaoda
• dev/lazy: should include imported and non-executed modules in the patch (#7815) by @hyf0
• set ExportsKind to Esm when json is none object literal (#7808) by @IWANABETHATGUY
• nativeMagicString move api (#7796) by @IWANABETHATGUY
• remove unnecessary exports after merging into commong and user defined entry (#7789) by @IWANABETHATGUY
• use output.name instead of chunk.name in mixed export warning (#7788) by @Copilot

🚜 Refactor

• generalize ParseError to OxcError with dynamic EventKind (#7868) by @shulaoda
• rust: rename advanced_chunks to manual_code_splitting (#7856) by @hyf0
• string_wizard error hanlding (#7830) by @IWANABETHATGUY
• remove experimental.disableLiveBindings option (#7820) by @sapphi-red
• node/test: run fixture tests in concurrent (#7790) by @hyf0
• move ConfigExport and RolldownOptionsFunction types to define-config (#7799) by @shulaoda
• cli: validate config after resolving and improve error message (#7798) by @shulaoda

Documentation

• rebrand (#7670) by @yyx990803
• fix incorrect default value for propertyReadSideEffects (#7847) by @Copilot
• remove options pages and redirect to reference pages (#7834) by @sapphi-red
• options: inline types to option property pages (#7831) by @sapphi-red
• options: port checks.pluginTimings content from options page to reference page (#7832) by @sapphi-red
• options: use @linkcode where possible (#7824) by @sapphi-red
• options: port content from options page to reference page (#7822) by @sapphi-red
• options: add descriptions for output options (#7821) by @sapphi-red
• options: add description for input options (#7802) by @sapphi-red
• options: add description for checks.* (#7801) by @sapphi-red
• apis: add hook graph (#7671) by @sapphi-red

🧪 Testing

• add all valid combination of chunk exports related test (#7851) by @IWANABETHATGUY
• enable MagicString test after api return type alignment (#7797) by @IWANABETHATGUY
• init magic-string test (#7794) by @IWANABETHATGUY

⚙️ Miscellaneous Tasks

• vite-tests: configure git user for rebase operation (#7875) by @shulaoda
• rolldown_binding: remove v3 native plugins (#7837) by @shulaoda
• rolldown_binding: allow crate-type as lib (#7866) by @Brooooooklyn
• README.md: adjust position and size of rolldown logo (#7861) by @hyf0
• deps: update test262 submodule for tests (#7857) by @sapphi-red
• deps: update oxc to v0.108.0 (#7845) by @renovate[bot]
• deps: update dependency oxlint to v1.39.0 (#7849) by @renovate[bot]
• deps: update dependency oxfmt to ^0.24.0 (#7844) by @renovate[bot]
• deps: update npm packages (#7841) by @renovate[bot]
• deps: update rust crates (#7839) by @renovate[bot]
• deps: update github-actions (#7840) by @renovate[bot]
• use workspace edition for all crates (#7829) by @IWANABETHATGUY
• deps: update dependency oxlint-tsgolint to v0.11.0 (#7827) by @renovate[bot]
• deps: update napi to v3.8.2 (#7810) by @renovate[bot]
• remove outdated snapshot files (#7806) by @shulaoda
• deps: update crate-ci/typos action to v1.42.0 (#7792) by @renovate[bot]

Features

• plugin_timings: add 3s threshold and doc link to warning message (#7741) by @shulaoda
• improve treeshaking logic to handle empty parameter list in dynamic import .then() callbacks (#7781) by @Copilot
• dev/lazy: don't include already executed modules (#7745) by @hyf0
• dev/lazy: support dynamic import(..) (#7726) by @hyf0
• inline dynamic imports that imports statically imported modules (#7742) by @IWANABETHATGUY
• option: add experimental option to control chunk optimization (#7738) by @IWANABETHATGUY

Bug Fixes

• inline dynamic entry to user defined entry with esm wrap kind (#7783) by @IWANABETHATGUY
• use canonical namespace reference for property access (#7777) by @IWANABETHATGUY
• dynamic entry merged into common chunk with cjs and esm wrap kind (#7771) by @IWANABETHATGUY
• tla: should not await non-tla-related modules (#7768) by @hyf0
• dynamic entry captured by common chunk with CJS format (#7757) by @IWANABETHATGUY
• module_loader: mark emitted chunks as user-defined entry when already loaded (#7765) by @shulaoda
• normalize preserveModulesRoot path (#7737) by @IWANABETHATGUY
• linker: resolve race condition in side effects computation for export-star (#7728) by @camc314

Refactor

• plugin_timings: filter out plugins with duration < 1s from timing warnings (#7785) by @shulaoda
• module_loader: remove unnecessary collect before extend (#7769) by @shulaoda
• rename _id suffixes to _idx for oxc_index types (#7767) by @IWANABETHATGUY
• remove duplicate preserve_entry_signatures from AddEntryModuleMsg (#7762) by @shulaoda
• module_loader: pass user_defined_entries by reference (#7756) by @shulaoda
• dev/lazy: get proxy entry's ResolvedId correctly (#7746) by @hyf0
• simplify try_rewrite_import_expression control flow (#7753) by @IWANABETHATGUY
• module_loader: remove unnecessary dynamic import handling for runtime module (#7754) by @shulaoda
• inline __toDynamicImportESM (#7747) by @IWANABETHATGUY
• use From impl for ModuleLoaderOutput conversion (#7732) by @shulaoda
• remove duplicate fields from ModuleLoader (#7731) by @shulaoda
• tweak resolve_user_defined_entries (#7727) by @shulaoda

Documentation

• add rolldown-string reference to native MagicString compatibility section (#7778) by @Copilot
• improve comments for export star side effects handling (#7730) by @IWANABETHATGUY

Testing

• use assertion instead of console.log for some testcase (#7744) by @IWANABETHATGUY

Miscellaneous Tasks

• tweak some output.dynamicImportInCjs related rollup test results (#7776) by @sapphi-red
• mark esbuild/dce/dce_of_symbol_ctor_call as passed (#7775) by @sapphi-red
• deps: update oxc apps (#7772) by @renovate[bot]
• vite-tests: allow running on PRs with test: vite-tests label (#7770) by @shulaoda
• deps: update oxc apps (#7760) by @renovate[bot]
• deps: update rollup submodule for tests to v4.55.1 (#7763) by @sapphi-red
• deps: update test262 submodule for tests (#7764) by @sapphi-red
• deps: update oxc to v0.107.0 (#7758) by @camc314
• deps: update taiki-e/install-action action to v2.65.13 (#7751) by @renovate[bot]
• deps: update rust crates (#7750) by @renovate[bot]
• deps: update npm packages (#7749) by @renovate[bot]
• deps: update github-actions (#7748) by @renovate[bot]
• deps: update dependency oxlint-tsgolint to v0.10.1 (#7729) by @renovate[bot]
• deps: update crate-ci/typos action to v1.41.0 (#7725) by @renovate[bot]

BREAKING CHANGES

• experimental/devtools: rename InputOptions#debug to InputOptions#devtools (#7686) by @Copilot

Features

• implement target feature check in should_transform_js for raw options (#7697) by @shulaoda
• support output.dynamicImportInCjs option (#7677) by @shulaoda
• types: expose ChecksOptions type (#7653) by @sapphi-red

Bug Fixes

• export runtime helpers for cross-chunk access (#7658) by @shulaoda
• cjs namespace merging regression (#7665) by @IWANABETHATGUY
• replace panic with proper error handling for hash placeholder generation (#7661) by @shulaoda
• remove the blank line between shebang and postBanner (#7643) by @btea
• rolldown_plugin_vite_reporter: apply padding before ANSI coloring for proper size column alignment (#7649) by @shulaoda

Refactor

• rust: use StableModuleId as the map key if possible (#7718) by @hyf0
• rust: return StableModuleId instead of &str from Module#stable_id() (#7717) by @hyf0
• rust: return correct stable id of external module from Module#stable_id() (#7716) by @hyf0
• rust: introduce StableModuleId type (#7715) by @hyf0
• rust: reduce unnecessary id.as_arc_str().clone().into() (#7714) by @hyf0
• rust: remove ModuleId#resource_id and use as_arc_str directly (#7710) by @hyf0
• rust: remove unused Module#id_clone (#7709) by @hyf0
• rust: remove Module#id_as_str and use Module#id directly (#7708) by @hyf0
• consolidate namespace call analysis into import analyzer (#7657) by @IWANABETHATGUY
• rust: make ExternalModule#id have the type ModuleId (#7707) by @hyf0
• rust: rename Module#id to Module#id_as_str (#7706) by @hyf0
• rust: use ModuleId instead of raw ArcStr for ScanStageCache (#7701) by @hyf0
• simplify error propagation in cache merge (#7702) by @shulaoda
• use ModuleId as the type of ResolvedId#id (#7694) by @hyf0
• types: rename resolved_request_info.rs to resolved_id.rs and move its contents (#7687) by @hyf0
• devtools: emit data to /node_modules/.rolldown (#7692) by @hyf0
• use InvalidOption for hash placeholder generation errors (#7674) by @shulaoda
• rolldown_error: remove dependency on rolldown_utils (#7672) by @shulaoda
• use nodejs-built-in-modules v1.0.0 directly in callsites (#7667) by @Boshen

Documentation

• migrate input options content from options to auto gen docs (#7663) by @mdong1909
• create reference index page (#7659) by @mdong1909
• tweak auto-generated reference output (#7654) by @sapphi-red
• initialize auto-gen docs (#7252) by @mdong1909

Miscellaneous Tasks

• deps: update napi (#7705) by @renovate[bot]
• pin Node.js version to 24.12.0 LTS in .node-version file (#7713) by @Copilot
• update esbuild test reasons (#7703) by @sapphi-red
• deps: update crate-ci/typos action to v1.40.1 (#7696) by @renovate[bot]
• deps: update oxc to v0.106.0 (#7512) by @renovate[bot]
• js: replace dprint with oxfmt (#7214) by @Boshen
• deps: update dependency oxlint to v1.36.0 (#7691) by @renovate[bot]
• deps: update github-actions (#7679) by @renovate[bot]
• deps: update npm packages (#7680) by @renovate[bot]
• deps: update rust crates (#7678) by @renovate[bot]
• deps: update oxc resolver to v11.16.2 (#7668) by @renovate[bot]
• add API reference files to knip entry points (#7669) by @Copilot
• deps: update notify (#7651) by @sapphi-red
• add homepage field to package.json (#7648) by @trivikr
• deps: update oxc resolver to v11.16.1 (#7647) by @renovate[bot]
• deps: update rolldown-plugin-dts to 0.20.0 (#7645) by @shulaoda

💥 BREAKING CHANGES

• tsconfig: enable project references support in manual mode (#7545) by @shulaoda

🚀 Features

• add CANNOT_CALL_NAMESPACE warning (#7636) by @sapphi-red
• add import path for unresolved import diagnostics (#7625) by @sapphi-red
• optimize dynamic entry facade chunks by merging with common chunks when they are captured by common chunks (#7486) by @IWANABETHATGUY

🐛 Bug Fixes

• rename __export to __exportAll to be compatible with cjs-module-lexer (#7640) by @IWANABETHATGUY
• strip UTF-8 BOM when using text loader (#7635) by @sapphi-red
• rolldown_plugin_replace: avoid crashing with invalid delimiters (#7621) by @sapphi-red

🚜 Refactor

• export all filter functions (#7622) by @sxzz
• allow multiple help messages in diagnostics (#7624) by @sapphi-red

📚 Documentation

• add README.md to packages/rolldown (#7556) by @Copilot

⚡ Performance

• use fsevents on macOS for file watching (#7596) by @sapphi-red

🧪 Testing

• handle re-exports of external modules in CJS format (#7641) by @IWANABETHATGUY
• update integration to use vite's rolldown-canary branch (#7633) by @shulaoda

⚙️ Miscellaneous Tasks

• docs: fix Netlify ignore condition to detect docs changes across all PR commits (#7637) by @Copilot
• deps: update rollup submodule for tests to v4.54.0 (#7630) by @sapphi-red
• skip benchmarks for PRs with 'graphite: merge-when-ready' label (#7631) by @Boshen
• deps: update esbuild for tests to 0.27.2 (#7629) by @sapphi-red
• fix "update-test-dependencies" workflow (#7628) by @sapphi-red
• deps: update test262 submodule for tests (#7626) by @sapphi-red
• deps: update dependency oxlint to v1.35.0 (#7623) by @renovate[bot]

💥 BREAKING CHANGES

• rename MIXED_EXPORT error to MIXED_EXPORTS (#7565) by @sapphi-red

🚀 Features

• rename id property to exporter in CIRCULAR_REEXPORT error (#7592) by @sapphi-red
• add ids property to CIRCULAR_DEPENDENCY error (#7591) by @sapphi-red
• node/dev: expose devMode.lazy (#7549) by @hyf0
• set log and pos properties for parseAst function errors (#7568) by @sapphi-red
• set log and pos properties for logs (#7567) by @sapphi-red
• test-dev-sever: support to manually configure port, run tests in concurrent (#7576) by @hyf0
• add exporter property to MISSING_EXPORT error (#7564) by @sapphi-red
• add id property to PARSE_ERROR error (#7563) by @sapphi-red
• support ImporterId hook filter (#7540) by @IWANABETHATGUY

🐛 Bug Fixes

• types: better "go to definition" experience for interface OutputPlugin (#7610) by @KazariEX
• postBanner content should be placed after shebang (#7583) by @btea
• use sanitized filename for preserve modules chunk name (#7603) by @IWANABETHATGUY
• correct filter out unused cjs namespace (#7602) by @IWANABETHATGUY
• watch: property respect notify.pollInternal and notify.compareContents (#7595) by @sapphi-red
• make cleanDir work with default output directory (#7579) by @shulaoda
• merge MISSING_NAME_OPTION_FOR_UMD_EXPORT error to MISSING_NAME_OPTION_FOR_IIFE_EXPORT error (#7566) by @sapphi-red
• dev/hmr: ensure cjs modules with no exports reference correct module identifier (#7544) by @leegeunhyeok

🚜 Refactor

• remove stable_id field from PARSE_ERROR error (#7593) by @sapphi-red
• make include_runtime_symbol reuseable after linking stage (#7580) by @IWANABETHATGUY
• rust/dev: construct the bundler within itself (#7553) by @hyf0
• rust/watcher: polish API of Watcher struct (#7551) by @hyf0
• use LinkingMetadata::stmt_info_included to check if a stmt_info is included (#7572) by @IWANABETHATGUY
• use LinkingMetadata::is_included to check if a module is included (#7571) by @IWANABETHATGUY
• store module and stmt_info is included info to module meta (#7570) by @IWANABETHATGUY
• make include_* method reunsable after linking stage (#7552) by @IWANABETHATGUY
• rust/watcher: construct the bundler within watcher itself (#7550) by @hyf0
• extract make include_runtime_symbol reusable (#7546) by @IWANABETHATGUY

⚙️ Miscellaneous Tasks

• renovate: add kill-port in ignoreDeps in renovate.json (#7619) by @sapphi-red
• deps: update rust crates (#7617) by @renovate[bot]
• deps: update npm packages (#7616) by @renovate[bot]
• deps: update github-actions (#7615) by @renovate[bot]
• ci: skip benchmark workflows on draft PRs (#7611) by @Copilot
• deps: update dependency rolldown-plugin-dts to ^0.19.0 (#7607) by @renovate[bot]
• deps: update dependency oxlint-tsgolint to v0.10.0 (#7601) by @renovate[bot]
• deps: update dependency rolldown-plugin-dts to v0.18.4 (#7599) by @renovate[bot]
• deps: update notify (#7594) by @sapphi-red
• test-dev-server: add retry mechanism to hmr-full-bundle-mode tests (#7588) by @Copilot
• deps: update napi to v3.7.1 (#7590) by @renovate[bot]
• add JSDoc documentation for memfs type (#7587) by @Copilot
• deps: update dependency oxlint to v1.34.0 (#7589) by @renovate[bot]
• move some tests in ignored-by-unsupported-features that are passing (#7569) by @sapphi-red
• deps: update dependency oxlint-tsgolint to v0.9.2 (#7582) by @renovate[bot]
• deps: update oxc resolver to v11.16.0 (#7574) by @renovate[bot]
• test/dev-server: don't run pnpm install during tests (#7560) by @hyf0
• test/dev-server: use kill-port@1 to improve performance (#7575) by @hyf0
• normalize error object to make some Rollup tests pass (#7562) by @sapphi-red
• ci: separate dev-server(hmr) tests and normal tests (#7558) by @hyf0
• ci: make native rolldown build reusable (#7557) by @hyf0
• resolve some TODOs (#7561) by @sapphi-red

❤️ New Contributors

• @KazariEX made their first contribution in #7610
• @leegeunhyeok made their first contribution in #7544

🚀 Features

• add validation errors for incompatible inlineDynamicImports options (#7539) by @Copilot
• rolldown_plugin_vite_reporter: truncate long importer lists in ineffective dynamic import warnings (#7528) by @Copilot
• export memfs from rolldown/experimental for browser builds (#7490) by @Copilot
• implement postBanner and postFooter (#7487) by @sevenc-nanashi
• port getLogFilter helper from Rollup for advanced log filtering (#6890) by @taearls
• dev: initialize rolldown_plugin_lazy_compilation (#7488) by @hyf0
• enable experimental.transform_hires_sourcemap: 'boundary' by default (#7478) by @sapphi-red
• apply merge CJS namespace optimizations more generally (#7475) by @sapphi-red

🐛 Bug Fixes

• avoid panic on invalid values for output.exports , output.format , output.hash_characters (#7542) by @sapphi-red
• handle proto export for module namespace correctly (#7534) by @sapphi-red
• handle proto export correctly (#7533) by @sapphi-red
• rolldown_plugin_vite_resolve: acquire resolver lock before package json resolution (#7524) by @sapphi-red
• disable syntax transform optimization for minify: 'dce-only' (#7520) by @sapphi-red
• arrow function expression keep names (#7519) by @IWANABETHATGUY
• skip symbols that are imported from other module when deconflicting module symbols (#7510) by @IWANABETHATGUY
• preserve class names in assignment expressions with keepNames option (#7491) by @IWANABETHATGUY
• accessor with decorators should be kept (#7499) by @Copilot
• rolldown_plugin_vite_reporter: support Infinity for chunk_limit (#7497) by @shulaoda
• change filename template validation errors from UNHANDLEABLE_ERROR to INVALID_OPTION (#7472) by @Copilot
• no entry found for key error when merging CJS namespace exports (#7474) by @sapphi-red
• generate output with syntax error when wrapped esm module using tla syntax (#7468) by @IWANABETHATGUY

🚜 Refactor

• dev: rename experimental.hmr to experimental.devMode (#7527) by @hyf0
• pass addon option to rust as it is (#7526) by @hyf0
• remove unused stmtinfo meta flag (#7518) by @IWANABETHATGUY

📚 Documentation

• clarify closeBundle behavior (#7525) by @sapphi-red

🧪 Testing

• add tests for static string postBanner and postFooter (#7516) by @Copilot
• disable pluginTimings in Rust integration tests to avoid snapshot noise (#7485) by @shulaoda
• port Rollup JSX tests to crates/rolldown/tests/rollup (#7480) by @sapphi-red
• re-triage some esbuild JSX preserve tests (#7479) by @sapphi-red
• disable pluginTimings by default to avoid snapshot noise (#7471) by @shulaoda

⚙️ Miscellaneous Tasks

• mark feature that will not be supported as ignored in rollup test status (#7535) by @sapphi-red
• support banner / footer / intro / outro for config variants (#7532) by @sapphi-red
• dce/dce_of_decorators esbuild test is now passing (#7531) by @sapphi-red
• deps: update github-actions (major) (#7495) by @renovate[bot]
• deps: update npm packages (#7493) by @renovate[bot]
• add a check to verify failedReasons are updated (#7521) by @sapphi-red
• deps: update test262 submodule for tests (#7523) by @sapphi-red
• deps: update taiki-e/install-action action to v2.63.2 (#7496) by @renovate[bot]
• deps: update oxc apps (#7511) by @renovate[bot]
• deps: update oxc to v0.103.0 (#7513) by @camc314
• fix format in .github/instructions/bug-investigation.instructions.md (#7506) by @sapphi-red
• add instructions for REPL decoding (#7502) by @sapphi-red
• deps: update github-actions (#7492) by @renovate[bot]
• deps: cargo-shear v1.9.0 (#7483) by @Boshen
• deps: update dependency oxlint-tsgolint to v0.9.0 (#7484) by @renovate[bot]
• deps: update dependency oxlint-tsgolint to v0.8.6 (#7470) by @renovate[bot]
• add syntax validation for test output chunks that are not executed (#7466) by @IWANABETHATGUY
• deps: update dependency rust to v1.92.0 (#7467) by @renovate[bot]
• deps: update test262 submodule for tests (#7457) by @sapphi-red

❤️ New Contributors

• @sevenc-nanashi made their first contribution in #7487
• @taearls made their first contribution in #6890

🚀 Features

• rolldown_plugin_vite_reporter: add newline after build summary for better log separation (#7458) by @shulaoda
• plugin: collect plugin hook execution timings (#7364) by @shulaoda
• test-dev-server: reload page when detecting hmr reload message (#7422) by @hyf0
• rolldown_plugin_vite_dynamic_import_vars: add transform-based v2 implementation (#7400) by @shulaoda
• rolldown_plugin_vite_import_glob: add transform-based v2 implementation (#7394) by @shulaoda
• rolldown_plugin_vite_wasm_helper: add v2 implementation (#7402) by @shulaoda
• expose error location and context fields on JS API error objects (#7341) by @Copilot
• add CIRCULAR_REEXPORT error (#7337) by @Copilot
• support emit prebuilt chunk (#7277) by @Copilot

🐛 Bug Fixes

• preserve object key order when parse json with serde_json (#7443) by @IWANABETHATGUY
• improve JSON parsing with serde_json to emit proper diagnostic (#7442) by @IWANABETHATGUY
• deconflict external symbols in CJS modules (#7447) by @IWANABETHATGUY
• rolldown_plugin_vite_transform,rolldown_plugin_vite_resolve: enable yarnPnp option when pnp is detected (#5791) by @sapphi-red
• skip deconflicting top-level symbols for CJS modules (#7425) by @IWANABETHATGUY
• rolldown_plugin_esm_external_require: run resolveId hook before other plugins (#7426) by @shulaoda
• avoid duplicate underscores in legitimized identifiers (#7418) by @IWANABETHATGUY
• use process.on('exit') instead of signal-exit on webcontainers (#7421) by @sapphi-red
• dev: remove imports when an import is removed (#7348) by @sapphi-red
• bench: access latency.mean instead of mean in tinybench result (#7417) by @shulaoda
• path compression in symbol linking (#7392) by @IWANABETHATGUY
• rolldown_plugin_vite_resolve: add RwLock to avoid clearing cache while resolving (#7386) by @sapphi-red
• handle JSON prototype properties correctly (#7383) by @IWANABETHATGUY
• preserve entry signature strict chunk merging (#7343) by @IWANABETHATGUY
• support eliminating multiple unused dynamic imports in a single statement (#7361) by @IWANABETHATGUY
• eliminate unreachable dynamic entry (#7356) by @IWANABETHATGUY
• NormalizedInputOptions#cwd should always exists (#7360) by @hyf0
• cli: support multiple comma-separated define arguments (#7340) by @Copilot
• remove redundant symbol param in __reExport runtime helper (#7346) by @IWANABETHATGUY
• always use __export for empty namespace objects when symbols enabled (#7345) by @IWANABETHATGUY
• relax the restriction of preserveEntrySignatures when merging chunks (#7339) by @IWANABETHATGUY

🚜 Refactor

• builtin-plugin: make config parameter required for vite plugins (#7451) by @shulaoda
• move esbuild test related scripts to scripts/src/esbuild-tests (#7377) by @sapphi-red
• rewrite gen-esbuild-test in TypeScript (#7376) by @sapphi-red
• remove unnecessary Option in current_stmt_idx (#7359) by @IWANABETHATGUY
• move more code into chunk optimizer (#7335) by @IWANABETHATGUY

📚 Documentation

• checks: clarify pluginTimings measures CPU time due to concurrent execution (#7448) by @shulaoda
• checks: add accuracy note to pluginTimings documentation (#7441) by @shulaoda
• development-guide: add esbuild test description (#7439) by @sapphi-red
• checks: expand pluginTimings documentation with detection mechanism (#7428) by @shulaoda
• add checks options documentation (#7427) by @shulaoda
• development-guide: add test262 integration test description (#7430) by @sapphi-red
• guide: fix grammer in getting-started (#7331) by @jakeparis

🧪 Testing

• rollup-tests: make --grep work and document it (#7431) by @sapphi-red
• add a way to run some test262 test cases by name (#7429) by @sapphi-red
• rolldown_plugin_vite_dynamic_import_vars: add test cases for v2 implementation (#7401) by @shulaoda
• rolldown_plugin_vite_import_glob: add test cases for v2 implementation (#7395) by @shulaoda
• triage new esbuild tests (#7405) by @sapphi-red
• hmr: delete file used (#5933) by @sapphi-red
• watch: add watchChange hook create/delete tests (#7349) by @sapphi-red
• hmr: delete file not used anymore (#5932) by @sapphi-red
• triage esbuild failed reasons (#7391) by @sapphi-red
• change esbuild tests stats and diff generation (#7379) by @sapphi-red
• dev: add continuous generate hmr patch and debounce bundle tests (#7368) by @hyf0
• add new esbuild tests (#7353) by @sapphi-red

❤️ New Contributors

• @sevenc-nanashi made their first contribution in #7487
• @taearls made their first contribution in #6890

BREAKING CHANGES

• drop i686-pc-windows-msvc target support (#7230) by @sapphi-red

Features

• rolldown_plugin_vite_manifest: pass normalized options to isLegacy callback (#7321) by @shulaoda
• plugin/vite-resolve: add disableCache option (#6763) by @sapphi-red
• rolldown: export createTokioRuntime for tsdown (#7264) by @shulaoda
• rolldown_plugin_vite_html: sync moduleSideEffects for already loaded modules (#7254) by @shulaoda
• rolldown_plugin_vite_html: load module scripts with side effects to prevent tree-shaking (#7244) by @shulaoda
• rolldown_plugin_vite_css_post: implement cssScopeTo for scoped CSS tree-shaking (#7240) by @shulaoda

Bug Fixes

• export default class decl __name runtime insertion (#7316) by @IWANABETHATGUY
• chunk side effects calculation (#7273) by @IWANABETHATGUY
• node: output.generateCode.preset: 'es2015' should set output.generateCode.symbols: true by default (#7314) by @sapphi-red
• skip name helper for classes with static name property (#7312) by @IWANABETHATGUY
• preserve chunk imports relationship after chunk merging (#7303) by @shulaoda
• dev: make register_modules async (#7289) by @hyf0
• preserve computed property in object destructuring (#7288) by @IWANABETHATGUY
• support dynamic imports with shared dependencies (#7261) by @IWANABETHATGUY
• call defer_sync_scan_data in non-incremental build mode (#7255) by @shulaoda
• optimize chunk merging for shared entry points (#7194) by @IWANABETHATGUY
• add indentation for UMD format output (#7263) by @IWANABETHATGUY
• rolldown_plugin_vite_css_post: pass options to isLegacy callback for proper legacy detection (#7260) by @shulaoda
• rolldown_plugin_vite_css_post: also detect ?inline=true query for inlined CSS (#7245) by @shulaoda
• rolldown_plugin_vite_css_post: distinguish empty CSS from no CSS (#7241) by @shulaoda
• add Windows support for t-run command (#7242) by @IWANABETHATGUY
• cjs: prevent duplicate require declarations for external modules with preserveModules (#7234) by @logaretm
• rolldown_plugin_vite_resolve: resolve from root for virtual modules (#7236) by @sapphi-red
• include entry level external modules in chunk exports (#7218) by @IWANABETHATGUY

Refactor

• dev: make removeClient async (#7313) by @hyf0
• move chunk merging code out of code_splitting.rs (#7285) by @IWANABETHATGUY
• extract common function util for chunk merging (#7271) by @IWANABETHATGUY
• use iterative method to merge chunks (#7256) by @IWANABETHATGUY
• use concat_string! instead of string replace for generating chunk level exports (#7247) by @IWANABETHATGUY

Documentation

• add warning to experimental.resolveNewUrlToAsset about JS/TS files (#7300) by @Copilot
• add sequential hook execution difference in plugin-api.md (#7308) by @Copilot
• add migration example from onwarn to onLog (#7299) by @Copilot
• add migration example for manualChunks to advancedChunks (#7298) by @Copilot
• deps: bump vitepress to fix build (#7307) by @sapphi-red
• examples & text for experimental.resolveNewUrlToAsset (#7259) by @TheAlexLichter

Performance

• rolldown_plugin_vite_css_post: lazily load cssScopeTo from JS module options (#7253) by @shulaoda
• rolldown_plugin_vite_css_post: avoid unnecessary string clones in resolve_asset_urls_in_css (#7250) by @shulaoda

Testing

• generate relative path like name in advanced chunks (#7267) by @IWANABETHATGUY
• add test case for preserveEntrySignatures with re-exports (#7279) by @IWANABETHATGUY
• add test262 integration tests (#7196) by @sapphi-red

Miscellaneous Tasks

• deps: update dependency rolldown-plugin-dts to v0.18.1 (#7304) by @renovate[bot]
• enable tracing feature for napi (#7322) by @sapphi-red
• deps: update napi (#7320) by @renovate[bot]
• deps: update oxc (#7318) by @renovate[bot]
• deps: update napi (#7317) by @renovate[bot]
• deps: update oxc to v0.100.0 (#7301) by @renovate[bot]
• deps: downgrade pnpm to 10.23.0 to fix Netlify build (#7306) by @shulaoda
• add trustPolicyExclude for chokidar and semver (#7302) by @sapphi-red
• update pnpm lockfile (#7291) by @IWANABETHATGUY
• deps: update npm packages (#7272) by @renovate[bot]

New Contributors

• @logaretm made their first contribution in #7234

BREAKING CHANGES

• change output.generatedCode.profilerNames default to false (#7139) by @Copilot

Features

• support vite-style tsconfig resolution (#6873) by @shulaoda
• rolldown: oxc v0.99.0 (#7165) by @camc314
• browser: export plugins (#7210) by @sxzz
• rolldown_plugin_vite_css_post: add inline parameter to cssMinify callback (#7191) by @shulaoda
• rolldown_plugin_vite_build_import_analysis: implement render_chunk to replace VITE_IS_MODERN flag (#7178) by @shulaoda
• rolldown_plugin_utils: optimize SVG data URL encoding (#7156) by @shulaoda
• dev: replace DevEngine::hasLatestBuildOutput with DevEngine::getBundleState (#7145) by @sapphi-red
• rolldown_plugin_vite_asset_import_meta_url: support @vite-ignore comment (#7141) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: implement static URL processing (#7140) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: align asset_resolver logic (#7137) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: align try_fs_resolve logic (#7136) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: validate relative paths (#7120) by @shulaoda
• export viteAssetImportMetaUrlPlugin and add dynamic URL tests (#7119) by @shulaoda

Bug Fixes

• watch overwrite rename event on linux (#7201) by @sapphi-red
• preserve name for parenthesized anonymous default exports and arrow functions with keepNames (#7159) by @Copilot
• rolldown_plugin_vite_html: add missing async attribute for inlined entry scripts (#7202) by @shulaoda
• respect target setting in DCE to prevent modern syntax generation (#7128) by @Copilot
• rolldown_plugin_vite_html: add semicolon to import statement in CSS removal (#7200) by @shulaoda
• rolldown_plugin_vite_html: use correct CSS asset filename in HTML injection (#7199) by @shulaoda
• rolldown_plugin_vite_css_post: handle scoped package names in lib CSS filename (#7198) by @shulaoda
• rolldown_plugin_vite_html: use patched html5gum with correct span tracking (#7193) by @shulaoda
• rolldown_plugin_vite_html: handle HTML strings in script tags correctly (#7192) by @shulaoda
• handle JSON import namespace property access correctly (#7190) by @IWANABETHATGUY
• only include runtime helpers from included modules (#7183) by @IWANABETHATGUY
• rolldown_plugin_vite_html: normalize paths to use forward slashes in original_file_name (#7175) by @shulaoda
• rolldown_plugin_vite_css_post: use filename instead of reference_id for imported assets (#7174) by @shulaoda
• rolldown_plugin_vite_css_post: correct regex escaping in pure CSS chunk pruning (#7173) by @shulaoda
• rolldown_plugin_vite_html: use correct dependency path for modulepreload links (#7172) by @shulaoda
• update cur_stmt_index when processing top level statements (#7157) by @IWANABETHATGUY
• rolldown_plugin_utils: strip leading character from public asset URL (#7170) by @shulaoda
• rolldown_plugin_utils: correct runtime handling and escape single quotes in asset paths (#7168) by @shulaoda
• rolldown_plugin_utils: prevent data race in file_to_url cache (#7166) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: correct glob pattern and query string handling in dynamic URLs (#7162) by @shulaoda
• rolldown_plugin_vite_css_post: use correct start position in magic string updates (#7158) by @shulaoda
• data race in FileEmitter::emit_file causing duplicate asset emissions (#7164) by @shulaoda
• dev: watch files even if the build failed (#7149) by @sapphi-red
• rolldown_plugin_utils: always use base64 encoding for data URLs (#7148) by @shulaoda
• preserve "default" name for anonymous default exports with keepNames (#7151) by @Copilot
• correctly handle cjs json module as entry point (#7147) by @IWANABETHATGUY
• rolldown_plugin_utils: correct reference_id parsing in render_asset_url_in_js (#7143) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: exclude quotes from URL span (#7142) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: use template literal for glob result indexing (#7134) by @shulaoda
• tree shake unused dynamic entry when inlineDynamicImports is enabled (#7129) by @IWANABETHATGUY
• correct return value of parse/parseSync functions (#7127) by @sapphi-red

Refactor

• rolldown_plugin_vite_transform: use oxc_resolver for tsconfig discovery (#7220) by @shulaoda
• rolldown_plugin_vite_resolve: use resolve_file for tsconfig discovery (#7216) by @shulaoda
• rolldown_plugin_utils: remove redundant ViteMetadata::get_or_insert_default() (#7189) by @shulaoda
• rolldown_plugin_utils: simplify ViteMetadata::get() to always return a value (#7188) by @shulaoda
• rolldown_utils: add guess_mime_skip_utf8_check for binary assets (#7161) by @shulaoda
• rolldown_plugin_utils: extract asset URL parsing into AssetUrlIter (#7144) by @shulaoda
• store pattern name in FilenameTemplate (#7132) by @IWANABETHATGUY

Documentation

• tsconfig: document auto-discovery mode and improve structure (#7228) by @shulaoda
• add plugin hook filter compatibility and fallback guide (#7138) by @Copilot
• update top level navigation (#7092) by @mdong1909

Testing

• add tsconfig include/exclude/files matching test cases (#6899) by @shulaoda
• vite-tests: run playwright install in case playwright binary is missing (#7226) by @sapphi-red
• watch: close watcher when an error occured in the test cases (#7225) by @sapphi-red
• watch: reject waitBuildFinished if ERROR event occurs (#7224) by @sapphi-red

⚙️ Miscellaneous Tasks

• example: revert accidental changes to basic-typescript (#7227) by @shulaoda
• deps: update oxc apps (#7212) by @renovate[bot]
• deps: update rust crates (#7204) by @renovate[bot]
• deps: update oxc_resolver_napi to 11.14.0 (#7217) by @shulaoda
• deps: update oxc_resolver (#6909) by @shulaoda
• deps: update dependency glob to v13 (#7208) by @renovate[bot]
• deps: update actions/checkout action to v6 (#7207) by @renovate[bot]
• add nul to workaround https://github.com/anthropics/claude-c… (#7237) by @IWANABETHATGUY
• deps: update dependency valibot to v1.2.0 [security] (#7231) by @renovate[bot]
• deps: update crate-ci/typos action to v1.40.0 (#7232) by @renovate[bot]

New Contributors

• @logaretm made their first contribution in #7234

BREAKING CHANGES

• rolldown_plugin_vite_react_refresh_wrapper: add vite prefix (#7086) by @shulaoda
• rolldown_plugin_vite_web_worker_post: add vite prefix (#7085) by @shulaoda
• rolldown_plugin_vite_wasm_helper: add vite prefix (#7084) by @shulaoda
• rolldown_plugin_vite_wasm_fallback: add vite prefix (#7083) by @shulaoda
• rolldown_plugin_vite_transform: add vite prefix (#7082) by @shulaoda
• rolldown_plugin_vite_reporter: add vite prefix (#7081) by @shulaoda
• rolldown_plugin_vite_module_preload_polyfill: add vite prefix (#7080) by @shulaoda
• rolldown_plugin_vite_manifest: add vite prefix (#7079) by @shulaoda
• rolldown_plugin_vite_load_fallback: add vite prefix (#7072) by @shulaoda
• rolldown_plugin_vite_json: add vite prefix (#7071) by @shulaoda
• rolldown_plugin_vite_import_glob: add vite prefix (#7070) by @shulaoda
• rolldown_plugin_vite_html_inline_proxy: add vite prefix (#7069) by @shulaoda
• rolldown_plugin_vite_dynamic_import_vars: add vite prefix (#7068) by @shulaoda
• rolldown_plugin_vite_build_import_analysis: add vite prefix (#7067) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: add vite prefix (#7066) by @shulaoda
• rolldown_plugin_vite_alias: add vite prefix (#7065) by @shulaoda
• rolldown_plugin_vite_asset_plugin: add vite prefix (#7064) by @shulaoda

Features

• export sync APIs to experimental (#7122) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: implement template literal support for dynamic URLs (#7118) by @shulaoda
• rolldown_plugin_vite_asset_import_meta_url: implement AST-based URL detection (#7113) by @shulaoda
• add isPathFragment validation for filename patterns (rollup compat) (#7101) by @IWANABETHATGUY
• rolldown_plugin_vite_asset_import_meta_url: align filter logic (#7103) by @shulaoda
• rolldown: oxc v0.98.0 (#6961) by @camc314
• show error contexts for unhandleable errors (#7095) by @sapphi-red
• rolldown_plugin_utils: extract get_hash utility function (#7059) by @shulaoda
• rolldown_plugin_asset: initialize CSSEntriesCache (#7015) by @shulaoda
• rolldown_plugin_vite_html: align transformIndexHtml logic (#7010) by @shulaoda
• builtin-plugin: support bindingifyViteHtmlPlugin (#7008) by @shulaoda
• impl generatedCode.symbols for reexport dynamic modules. (#6993) by @IWANABETHATGUY
• rolldown_plugin_manifest: support v2 logic (#6979) by @shulaoda
• support Node.js module.exports ESM export (#6967) by @Copilot
• change "could not clean directory" from error to warning (#6955) by @Copilot
• rolldown_binding: add context to errors thrown by plugin hooks (#6964) by @sapphi-red

Bug Fixes

• content hash should be affected by the minify behavior (#7102) by @hyf0
• canonical name not found for "__toESM" error when only named imports are used from a CJS module (#7094) by @sapphi-red
• preserve directory structure in chunk names with preserveModules (#6872) by @IWANABETHATGUY
• rolldown_plugin_asset: correct bundle deletion index calculation (#7063) by @shulaoda
• rolldown_plugin_utils: correct string slicing in render_asset_url_in_js (#7061) by @shulaoda
• rolldown_plugin_vite_html: use transformed result in asset URL handling (#7060) by @shulaoda
• rolldown_plugin_vite_html: skip redundant path resolution for processed URLs (#7058) by @shulaoda
• rolldown_plugin_vite_css_post: data race in CSS URL processing (#7055) by @shulaoda
• rolldown_plugin_vite_css_post: always compute css asset dirname in build command (#7054) by @shulaoda
• rolldown_plugin_vite_css: ensure consistent url in import and export (#7053) by @shulaoda
• rolldown_plugin_vite_css_post: use get_or_insert_default for HTMLProxyResult (#7052) by @shulaoda
• rolldown_plugin_vite_css: skip commonjs-proxy CSS requests (#7050) by @shulaoda
• rolldown_plugin_utils: correct is_css_module (#7049) by @shulaoda
• rolldown_plugin_utils: correct is_css_request (#7048) by @shulaoda
• rolldown_plugin_vite_html: use correct inline module index (#7046) by @shulaoda
• rolldown_plugin_vite_html: correct scripts url update logic (#7045) by @shulaoda
• rolldown_plugin_vite_html: fallback to original url on NotFound error (#7043) by @shulaoda
• rolldown_plugin_vite_html: move src_tasks to correct branch (#7040) by @shulaoda
• rolldown_plugin_vite_html: correct handle_style_tag_or_attribute (#7038) by @shulaoda
• builtin-plugin: add config to htmlInlineProxyPlugin (#7036) by @shulaoda
• missing CJS default export when SafelyMergeCjsNs optimization is enabled (#7006) by @Copilot
• reserve global names before deconflicting external symbols (#7022) by @IWANABETHATGUY
• rolldown_plugin_build_import_analysis: process all bundle outputs correctly (#7020) by @shulaoda
• rolldown_plugin_vite_css_post: process all bundle outputs correctly (#7019) by @shulaoda
• rolldown_plugin_vite_css_post: remove /$vite$:1/ correctly (#7018) by @shulaoda
• rolldown_plugin_vite_html: use correct span for style_urls (#7017) by @shulaoda
• rolldown_plugin_vite_html: track full element span from start to end tag (#7016) by @shulaoda
• builtin-plugin: correct viteHtmlPlugin related logic (#7013) by @shulaoda
• remove unused module namespace object exporting (#7002) by @IWANABETHATGUY
• rust/dev: allow to recover from hmr rebuild failure (#6991) by @hyf0
• rust/dev: ensure_latest_bundle_output shouldn't loop infinitely (#6974) by @hyf0
• rust/dev: DevEngine#ensure_latest_bundle_output should schedule a rebuild task if there're no queued tasks (#6968) by @hyf0
• add Symbol.toStringTag to module facades when generatedCode.symbols is enabled (#6784) by @Copilot

Refactor

• extension checking to use constant array (#7057) by @Copilot
• rust/devtools: tweak namings and introduction comments (#7028) by @hyf0
• rolldown_plugin_vite_html: use root instead of cwd (#7035) by @shulaoda
• rolldown_plugin_vite_css_post: use root instead of cwd (#7034) by @shulaoda
• rolldown_plugin_vite_css: use root instead of cwd (#7033) by @shulaoda
• rolldown_plugin_transform: use root instead of cwd (#7032) by @shulaoda
• rolldown_plugin_reporter: use root instead of cwd (#7031) by @shulaoda
• rolldown_plugin_asset: use root instead of cwd (#7030) by @shulaoda
• rolldown_plugin_html_inline_proxy: use root instead of cwd (#7029) by @shulaoda
• rust/dev: remove dead code of rolldown_dev crate (#6997) by @hyf0
• rust: move dev related code into new rolldown_dev crate (#6996) by @hyf0
• rolldown_resolver: use consistent generic parameter name Fs (#6998) by @shulaoda
• rolldown_resolver: improve resolve method clarity and documentation (#6986) by @shulaoda
• rename is_module_facade() to is_entry_point() for clarity (#6994) by @IWANABETHATGUY
• rust/dev: unwrap Result<_> from the return type of BundleCoordinator::schedule_build_if_stale (#6980) by @sapphi-red
• rolldown_resolver: reorganize impl blocks (#6984) by @shulaoda
• rolldown_resolver: extract configuration logic into separate module (#6983) by @shulaoda
• rolldown_resolver: improve error messages (#6982) by @shulaoda
• rust/dev: rename CoordinatorStatus to CoordinatorStateSnapshot (#6973) by @hyf0
• rust/dev: replace InitialBuildState with CoordinatorState (#6972) by @hyf0
• ast_scanner: derive Debug , Clone , Copy for CjsGlobalAssignmentType (#6971) by @camc314
• rust: filter out devtools specific events for normal tracing (#6965) by @hyf0
• rust/dev: replace CoordinatorMsg::HasLatestBuildOutput with GetStatus (#6960) by @hyf0
• rust/dev: ensure_current_build_finish shouldn't block the coordinator's event loop (#6959) by @hyf0

Documentation

• in-depth/directives: remove TODOs and fix code (#7112) by @sapphi-red
• clarify concepts of rolldown's test infra (#7047) by @hyf0
• contrib/style: add suggestions about choosing file names (#6989) by @hyf0

Performance

• rolldown_plugin_vite_css_post: cache CSS URL processing results (#7056) by @shulaoda
• remove unnecessary collect_vec (#6999) by @IWANABETHATGUY

Testing

• add testcase for #6880 and #6879 (#7107) by @IWANABETHATGUY
• vite-tests: use integration branch for vite compatibility tests (#7091) by @shulaoda

Miscellaneous Tasks

• deps: update dependency rolldown-plugin-dts to v0.18.1 (#7304) by @renovate[bot]

New Contributors

• @mdong1909 made their first contribution in #6929