[1.0.0-rc.3] - 2026-02-04

⚡ Remove Unnecessary Default Export Assignment

• Eliminates redundant variable assignments when exporting default values
• Reduces output bundle size and improves code clarity

// index.js
var x = 42;
export default x;

// Before
var x = 42;
var entry_default = x;
export { entry_default as default };

// After
var x = 42;
export { x as default };

🐛 Avoid Unnecessary Facade Chunks

• Keep user-defined entry modules in their own chunks
• Reduces HTTP round trips and improves startup performance

// main.js (entry module)
import { a } from './lib.js'
console.log(a)

// lib.js
export * from './counter.js'

// counter.js (entry module)
export const a = 100

// Before
dist/
├── main.js           → import { a } from './counter-chunk.js'; console.log(a)
├── counter.js        → export { a } from './counter-chunk.js' // ❌ facade chunk
└── counter-chunk.js  → export const a = 100

// After
dist/
├── main.js    → import { a } from './counter.js'; console.log(a)
└── counter.js → export const a = 100

🚀 Features

• expose RUNTIME_MODULE_ID constant for plugin authors (feat: expose RUNTIME_MODULE_ID constant for plugin authors #8199) by @shulaoda
• warn unsupported combination of preserveValueImports and importsNotUsedAsValues in tsconfig.json (feat: warn unsupported combination of preserveValueImports and importsNotUsedAsValues in tsconfig.json #8169) by @sapphi-red
• sophisticated watch tracking for load dependencies (feat: sophisticated watch tracking for load dependencies #8092) by @sapphi-red
• add inputMap option to minify / minifySync functions (feat: add inputMap option to minify / minifySync functions #8138) by @sapphi-red
• consolidate same tsconfig errors (feat: consolidate same tsconfig errors #8119) by @sapphi-red
• include tsconfig file path in error messages (feat: include tsconfig file path in error messages #8107) by @copilot
• lazy-barrel: support incremental build mode (feat(lazy-barrel): support incremental build mode #8114) by @shulaoda

🐛 Bug Fixes

• rust: preserve dependencies added by this.addWatchFile (fix(rust): preserve dependencies added by this.addWatchFile #8198) by @hyf0
• spawn RuntimeModuleTask after build_start to avoid race condition (fix: spawn RuntimeModuleTask after build_start to avoid race condition #8182) by @shulaoda
• rust/dev: only close after the ongoing task finished (fix(rust/dev): only close after the ongoing task finished #8147) by @hyf0
• ensure \0rolldown/runtime.js will go through transform hook and add test (fix: ensure \0rolldown/runtime.js will go through transform hook and add test #8093) by @hyf0
• [name] in assetFileNames does not include the directory part (fix: [name] in assetFileNames does not include the directory part #8098) by @IWANABETHATGUY
• handle external module properties in namespace imports (fix: handle external module properties in namespace imports #8124) by @IWANABETHATGUY
• keep user-defined entry modules in their own chunks (fix: keep user-defined entry modules in their own chunks #8047) by @IWANABETHATGUY
• avoid Unknown resolve error error message (fix: avoid Unknown resolve error error message #8111) by @sapphi-red

💼 Other

• remove warnings for building rolldown with not(feature = "experimental") (build: remove warnings for building rolldown with not(feature = "experimental") #8110) by @coolreader18

🚜 Refactor

• move VERSION to constants directory (refactor: move VERSION to constants directory #8200) by @shulaoda
• simplify import symbol check using SymbolFlags (refactor: simplify import symbol check using SymbolFlags #8193) by @shulaoda
• extract tsconfig option and transform options merging logic (refactor: extract tsconfig option and transform options merging logic #8168) by @sapphi-red
• filter empty module_groups before sorting (refactor: filter empty module_groups before sorting #8149) by @ShroXd
• lazy-barrel: use single remove instead of contains_key + remove (refactor(lazy-barrel): use single remove instead of contains_key + remove #8123) by @shulaoda
• lazy-barrel: avoid redundant call and inline get_barrel_normal_module (refactor(lazy-barrel): avoid redundant call and inline get_barrel_normal_module #8122) by @shulaoda
• use logger instead of console.log for warnings (refactor: use logger instead of console.log for warnings #8117) by @IWANABETHATGUY
• module-loader: remove intermediate ModuleTaskOwnerRef type (refactor(module-loader): remove intermediate ModuleTaskOwnerRef type #8113) by @shulaoda
• rename ReExportExternalModule to ReExportDynamicExports (refactor: rename ReExportExternalModule to ReExportDynamicExports #8104) by @IWANABETHATGUY

📚 Documentation

• add dynamic OG image generation (docs: add dynamic OG image generation #8192) by @sapphi-red
• add dynamic OG image generation (docs: add dynamic OG image generation #8191) by @sapphi-red
• add dynamic OG image generation (docs: add dynamic OG image generation #8179) by @copilot
• apis: add links to option descriptions in JSDoc comments (docs(apis): add links to option descriptions in JSDoc comments #8167) by @sapphi-red
• apis: clarify parameters of resolveDynamicImport hook (docs(apis): clarify parameters of resolveDynamicImport hook #8137) by @sapphi-red
• lazy-barrel: clarify default export behavior (docs(lazy-barrel): clarify default export behavior #8128) by @shulaoda

⚡ Performance

• remove unnecessary assignment for default export (perf: remove unnecessary assignment for default export #8127) by @shulaoda

🧪 Testing

• dev: this.addWatchFile dependency should be preserved after reload (test(dev): this.addWatchFile dependency should be preserved after reload #8165) by @sapphi-red
• mark flaky transform_runtime_module test as ignored (test: mark flaky transform_runtime_module test as ignored #8178) by @copilot
• rolldown_sourcemap: add test for coarse segments (test(rolldown_sourcemap): add test for coarse segments #8166) by @sapphi-red
• dev: correctly assert file change (test(dev): correctly assert file change #8164) by @sapphi-red
• rust: transform_runtime_module test shouldn't panic inside (test(rust): transform_runtime_module test shouldn't panic inside #8151) by @hyf0
• rust: fix flakiness of rust tests (test(rust): fix flakiness of rust tests #8150) by @hyf0
• mark output.dynamicImportInCjs tests as passed (test: mark output.dynamicImportInCjs tests as passed #8125) by @shulaoda
• lazy-barrel: add test cases for default export (test(lazy-barrel): add test cases for default export #8129) by @shulaoda
• rolldown_plugin_vite_manifest: use relative path for outPath (test(rolldown_plugin_vite_manifest): use relative path for outPath #8101) by @shulaoda

⚙️ Miscellaneous Tasks

• deps: update crate-ci/typos action to v1.43.1 (chore(deps): update crate-ci/typos action to v1.43.1 #8188) by @renovate[bot]
• deps: update rust crate ts-rs to v12 (chore(deps): update rust crate ts-rs to v12 #8160) by @renovate[bot]
• deps: update crate-ci/typos action to v1.43.0 (chore(deps): update crate-ci/typos action to v1.43.0 #8175) by @renovate[bot]
• deps: update rust crates (chore(deps): update rust crates #8157) by @renovate[bot]
• deps: update oxc to v0.112.0 (chore(deps): update oxc to v0.112.0 #8171) by @renovate[bot]
• deps: update rollup submodule for tests to v4.57.1 (chore(deps): update rollup submodule for tests to v4.57.1 #8176) by @sapphi-red
• deps: update test262 submodule for tests (chore(deps): update test262 submodule for tests #8177) by @sapphi-red
• deps: update dependency oxlint to v1.43.0 (chore(deps): update dependency oxlint to v1.43.0 #8173) by @renovate[bot]
• deps: update dependency oxfmt to ^0.28.0 (chore(deps): update dependency oxfmt to ^0.28.0 #8170) by @renovate[bot]
• deps: update dependency rolldown-plugin-dts to v0.21.8 (chore(deps): update dependency rolldown-plugin-dts to v0.21.8 #8163) by @renovate[bot]
• deps: update dependency vue-router to v5 (chore(deps): update dependency vue-router to v5 #8159) by @renovate[bot]
• deps: update github-actions (chore(deps): update github-actions #8158) by @renovate[bot]
• deps: update npm packages (chore(deps): update npm packages #8156) by @renovate[bot]
• deps: update dependency oxlint-tsgolint to v0.11.4 (chore(deps): update dependency oxlint-tsgolint to v0.11.4 #8140) by @renovate[bot]
• fix clippy replacement typo (chore: fix clippy replacement typo #8136) by @IWANABETHATGUY
• disallow HashMap::new and HashSet::new by clippy (chore: disallow HashMap::new and HashSet::new by clippy #8135) by @sapphi-red
• deps: update dependency rolldown-plugin-dts to v0.21.7 (chore(deps): update dependency rolldown-plugin-dts to v0.21.7 #8126) by @renovate[bot]
• deps: update oxc resolver to v11.17.0 (chore(deps): update oxc resolver to v11.17.0 #8121) by @renovate[bot]
• deps: update dependency oxlint-tsgolint to v0.11.3 (chore(deps): update dependency oxlint-tsgolint to v0.11.3 #8109) by @renovate[bot]

❤️ New Contributors

• @coolreader18 made their first contribution in #8110