[1.0.0-rc.5] - 2026-02-18

💡 Smarter entriesAware Manual Code Splitting

New entriesAware and entriesAwareMergeThreshold options for manualCodeSplitting.groups[] enable entry-reachability-based chunk splitting with automatic small chunk merging.

• entriesAware: true splits matched modules by entry reachability — modules reached by the same set of entries are grouped together, providing the most precise loading behavior with less over-fetching
• Chunks now get more readable names reflecting their entry associations (e.g. vendor-entry-a-entry-b.js) instead of opaque hashes
• entriesAwareMergeThreshold sets a byte-size threshold to merge tiny subgroups into the closest sibling with the fewest extra entries, reducing micro-chunk fragmentation while preserving precision
• Recommended to use together with maxSize: merge tiny chunks first to reduce request overhead, then cap large chunks to control payload size

manualCodeSplitting: {
  groups: [{
    name: 'vendor',
    test: /node_modules/,
    entriesAware: true,
    entriesAwareMergeThreshold: 28000, // bytes
  }]
}

🚀 Features

• add Visitor to rolldown/utils (feat: add Visitor to rolldown/utils #8373) by @sapphi-red
• module-info: add inputFormat property to ModuleInfo (feat(module-info): add inputFormat property to ModuleInfo #8329) by @shulaoda
• default treeshake.invalid_import_side_effects to false (feat: default treeshake.invalid_import_side_effects to false #8357) by @sapphi-red
• rolldown_utils: add IndexBitSet (feat(rolldown_utils): add IndexBitSet #8343) by @sapphi-red
• rolldown_utils: add more methods and trait impls to BitSet (feat(rolldown_utils): add more methods and trait impls to BitSet #8342) by @sapphi-red
• rolldown_plugin_vite_build_import_analysis: add support for await import().then((m) => m.prop) (feat(rolldown_plugin_vite_build_import_analysis): add support for await import().then((m) => m.prop) #8328) by @sapphi-red
• rolldown_plugin_vite_reporter: support custom logger for build infos (feat(rolldown_plugin_vite_reporter): support custom logger for build infos #7652) by @shulaoda
• rust/mcs: support entriesAwareMergeThreshold (feat(rust/mcs): support entriesAwareMergeThreshold #8312) by @hyf0
• mcs: maxSize will split the oversized chunk with taking file relevance into account (feat(mcs): maxSize will split the oversized chunk with taking file relevance into account #8277) by @hyf0
• rolldown_plugin_vite_import_glob: support template literal in glob import patterns (feat(rolldown_plugin_vite_import_glob): support template literal in glob import patterns #8298) by @shulaoda
• rolldown_plugin_chunk_import_map: output importmap without spaces (feat(rolldown_plugin_chunk_import_map): output importmap without spaces #8297) by @sapphi-red
• add INEFFECTIVE_DYNAMIC_IMPORT warning in core (feat: add INEFFECTIVE_DYNAMIC_IMPORT warning in core #8284) by @shulaoda
• mcs: generate more readable name for entriesAware chunks (feat(mcs): generate more readable name for entriesAware chunks #8275) by @hyf0
• mcs: support entriesAware (feat(mcs): support entriesAware #8274) by @hyf0

🐛 Bug Fixes

• improve circular dependency detection in chunk optimizer (fix: improve circular dependency detection in chunk optimizer #8371) by @IWANABETHATGUY
• align minify.compress: true and minify.mangle: true with minify: true (fix: align minify.compress: true and minify.mangle: true with minify: true #8367) by @sapphi-red
• rolldown_plugin_esm_external_require: apply conversion to UMD and IIFE outputs (fix(rolldown_plugin_esm_external_require): apply conversion to UMD and IIFE outputs #8359) by @sapphi-red
• cjs: bailout treeshaking on cjs modules that have multiple re-exports (fix(cjs): bailout treeshaking on cjs modules that have multiple re-exports #8348) by @hyf0
• handle member expression and this expression in JSX element name rewriting (fix: handle member expression and this expression in JSX element name rewriting #8323) by @IWANABETHATGUY
• pad encode_hash_with_base output to fixed length to prevent slice panics (fix: pad encode_hash_with_base output to fixed length to prevent slice panics #8320) by @shulaoda
• xxhash_with_base skips hashing when input is exactly 16 bytes (fix: xxhash_with_base skips hashing when input is exactly 16 bytes #8319) by @shulaoda
• complete ImportKind::try_from with missing variants and correct url-import to url-token (fix: complete ImportKind::try_from with missing variants and correct url-import to url-token #8310) by @shulaoda
• mark Node.js builtin modules as side-effect-free when resolved via external config (fix: mark Node.js builtin modules as side-effect-free when resolved via external config #8304) by @IWANABETHATGUY
• mcs: maxSize should split chunks correctly based on sizes (fix(mcs): maxSize should split chunks correctly based on sizes #8289) by @hyf0

🚜 Refactor

• introduce RawMangleOptions and RawCompressOptions (refactor: introduce RawMangleOptions and RawCompressOptions #8366) by @sapphi-red
• mcs: refactor apply_manual_code_splitting into ManualSplitter (refactor(mcs): refactor apply_manual_code_splitting into ManualSplitter #8346) by @hyf0
• rolldown_plugin_vite_reporter: simplify hook registration and remove redundant state (refactor(rolldown_plugin_vite_reporter): simplify hook registration and remove redundant state #8322) by @shulaoda
• use set to store user defined entry modules (refactor: use set to store user defined entry modules #8315) by @IWANABETHATGUY
• rust/mcs: collect groups into map at first for having clean and performant operations (refactor(rust/mcs): collect groups into map at first for having clean and performant operations #8313) by @hyf0
• mcs: introduce newtype ModuleGroupOrigin and ModuleGroupId (refactor(mcs): introduce newtype ModuleGroupOrigin and ModuleGroupId #8311) by @hyf0
• remove unnecessary FinalizerMutableState struct (refactor: remove unnecessary FinalizerMutableState struct #8303) by @shulaoda
• move module finalization into finalize_modules (refactor: move module finalization into finalize_modules #8302) by @shulaoda
• extract apply_transfer_parts_mutation into its own module (refactor: extract apply_transfer_parts_mutation into its own module #8301) by @shulaoda
• move ESM format check into determine_export_mode (refactor: move ESM format check into determine_export_mode #8294) by @shulaoda
• remove warnings field from GenerateContext (refactor: remove warnings field from GenerateContext #8293) by @shulaoda
• extract util function remove clippy supression (refactor: extract util function remove clippy supression #8290) by @IWANABETHATGUY
• move is_in_node_modules to PathExt trait in rolldown_std_utils (refactor: move is_in_node_modules to PathExt trait in rolldown_std_utils #8286) by @shulaoda
• rolldown_plugin_vite_reporter: remove unnecessary ineffective dynamic import detection logic (refactor(rolldown_plugin_vite_reporter): remove unnecessary ineffective dynamic import detection logic #8285) by @shulaoda
• dev: inject hmr runtime to \0rolldown/runtime.js (refactor(dev): inject hmr runtime to \0rolldown/runtime.js #8234) by @hyf0
• improve naming in chunk_optimizer (refactor: improve naming in chunk_optimizer #8287) by @IWANABETHATGUY
• simplify PostChunkOptimizationOperation from bitflags to enum (refactor: simplify PostChunkOptimizationOperation from bitflags to enum #8283) by @IWANABETHATGUY
• optimize BitSet.index_of_one to return iterator instead of Vec (refactor: optimize BitSet.index_of_one to return iterator instead of Vec #8282) by @IWANABETHATGUY

📚 Documentation

• change default value in format JSDoc from 'esm' to 'es' (docs: change default value in format JSDoc from 'esm' to 'es' #8372) by @shulaoda
• in-depth: remove invalidImportSideEffects option mention from lazy barrel optimization doc (docs(in-depth): remove invalidImportSideEffects option mention from lazy barrel optimization doc #8355) by @sapphi-red
• mcs: clarify minSize constraints (docs(manual-code-splitting): clarify minSize constraints #8279) by @ShroXd

⚡ Performance

• use IndexVec for chunk TLA detection (perf: use IndexVec for chunk TLA detection #8341) by @sapphi-red
• only invoke single resolve call for the same specifier and import kind (perf: only invoke single resolve call for the same specifier and import kind #8332) by @sapphi-red
• rolldown_plugin_vite_reporter: skip gzip computation when report_compressed_size is disabled (perf(rolldown_plugin_vite_reporter): skip gzip computation when report_compressed_size is disabled #8321) by @shulaoda

🧪 Testing

• use vi.waitFor and expect.poll instead of custom waitUtil function (test: use vi.waitFor and expect.poll instead of custom waitUtil function #8369) by @sapphi-red
• rolldown_plugin_esm_external_require_plugin: add tests (test(rolldown_plugin_esm_external_require_plugin): add tests #8358) by @sapphi-red
• add watch file tests (test: add watch file tests #8330) by @sapphi-red
• rolldown_plugin_vite_build_import_analysis: add test for dynamic import treeshaking (test(rolldown_plugin_vite_build_import_analysis): add test for dynamic import treeshaking #8327) by @sapphi-red

⚙️ Miscellaneous Tasks

• prepare-release: skip workflow on forked repositories (ci(prepare-release): skip workflow on forked repositories #8368) by @shulaoda
• format more files (chore: format more files #8360) by @sapphi-red
• deps: update oxc to v0.114.0 (chore(deps): update oxc to v0.114.0 #8347) by @camc314
• deps: update test262 submodule for tests (chore(deps): update test262 submodule for tests #8354) by @sapphi-red
• deps: update crate-ci/typos action to v1.43.5 (chore(deps): update crate-ci/typos action to v1.43.5 #8350) by @renovate[bot]
• deps: update oxc apps (chore(deps): update oxc apps #8351) by @renovate[bot]
• rolldown_plugin_vite_reporter: remove unnecessary README.md (chore(rolldown_plugin_vite_reporter): remove unnecessary README.md #8334) by @shulaoda
• deps: update npm packages (chore(deps): update npm packages #8338) by @renovate[bot]
• deps: update rust crates (chore(deps): update rust crates #8339) by @renovate[bot]
• deps: update dependency oxlint-tsgolint to v0.13.0 (chore(deps): update dependency oxlint-tsgolint to v0.13.0 #8337) by @renovate[bot]
• deps: update github-actions (chore(deps): update github-actions #8336) by @renovate[bot]
• deps: update napi to v3.8.3 (chore(deps): update napi to v3.8.3 #8331) by @renovate[bot]
• deps: update dependency oxlint-tsgolint to v0.12.2 (chore(deps): update dependency oxlint-tsgolint to v0.12.2 #8325) by @renovate[bot]
• remove unnecessary transform.decorator (chore: remove unnecessary transform.decorator #8314) by @IWANABETHATGUY
• deps: update dependency rust to v1.93.1 (chore(deps): update dependency rust to v1.93.1 #8305) by @renovate[bot]
• deps: update dependency oxlint-tsgolint to v0.12.1 (chore(deps): update dependency oxlint-tsgolint to v0.12.1 #8300) by @renovate[bot]
• deps: update oxc apps (chore(deps): update oxc apps #8296) by @renovate[bot]
• docs: don't skip for build runs without cache (ci(docs): don't skip for build runs without cache #8281) by @sapphi-red