npm rolldown 1.0.0-rc.5
v1.0.0-rc.5
on Node.js NPM

latest releases: 1.0.0-rc.7, 1.0.0-rc.6
14 days ago

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

💡 Smarter entriesAware for Code Splitting

New entriesAware and entriesAwareMergeThreshold options for codeSplitting.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 
codeSplitting: {
  groups: [{
    name: 'vendor',
    test: /node_modules/,
    entriesAware: true,
    entriesAwareMergeThreshold: 28000, // bytes
  }]
}

🚀 Features

  • add Visitor to rolldown/utils (#8373) by @sapphi-red
  • module-info: add inputFormat property to ModuleInfo (#8329) by @shulaoda
  • default treeshake.invalid_import_side_effects to false (#8357) by @sapphi-red
  • rolldown_utils: add IndexBitSet (#8343) by @sapphi-red
  • 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) (#8328) by @sapphi-red
  • rolldown_plugin_vite_reporter: support custom logger for build infos (#7652) by @shulaoda
  • rust/mcs: support entriesAwareMergeThreshold (#8312) by @hyf0
  • 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 (#8298) by @shulaoda
  • rolldown_plugin_chunk_import_map: output importmap without spaces (#8297) by @sapphi-red
  • add INEFFECTIVE_DYNAMIC_IMPORT warning in core (#8284) by @shulaoda
  • mcs: generate more readable name for entriesAware chunks (#8275) by @hyf0
  • mcs: support entriesAware (#8274) by @hyf0

🐛 Bug Fixes

  • improve circular dependency detection in chunk optimizer (#8371) by @IWANABETHATGUY
  • 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 (#8359) by @sapphi-red
  • 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 (#8323) by @IWANABETHATGUY
  • 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 (#8319) by @shulaoda
  • 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 (#8304) by @IWANABETHATGUY
  • mcs: maxSize should split chunks correctly based on sizes (#8289) by @hyf0

🚜 Refactor

  • introduce RawMangleOptions and RawCompressOptions (#8366) by @sapphi-red
  • mcs: refactor apply_manual_code_splitting into ManualSplitter (#8346) by @hyf0
  • rolldown_plugin_vite_reporter: simplify hook registration and remove redundant state (#8322) by @shulaoda
  • 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 (#8313) by @hyf0
  • mcs: introduce newtype ModuleGroupOrigin and ModuleGroupId (#8311) by @hyf0
  • remove unnecessary FinalizerMutableState struct (#8303) by @shulaoda
  • move module finalization into finalize_modules (#8302) by @shulaoda
  • extract apply_transfer_parts_mutation into its own module (#8301) by @shulaoda
  • move ESM format check into determine_export_mode (#8294) by @shulaoda
  • remove warnings field from GenerateContext (#8293) by @shulaoda
  • extract util function remove clippy supression (#8290) by @IWANABETHATGUY
  • 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 (#8285) by @shulaoda
  • dev: inject hmr runtime to \0rolldown/runtime.js (#8234) by @hyf0
  • improve naming in chunk_optimizer (#8287) by @IWANABETHATGUY
  • simplify PostChunkOptimizationOperation from bitflags to enum (#8283) by @IWANABETHATGUY
  • 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' (#8372) by @shulaoda
  • in-depth: remove invalidImportSideEffects option mention from lazy barrel optimization doc (#8355) by @sapphi-red
  • mcs: clarify minSize constraints (#8279) by @ShroXd

⚡ Performance

  • use IndexVec for chunk TLA detection (#8341) by @sapphi-red
  • 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 (#8321) by @shulaoda

🧪 Testing

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

⚙️ Miscellaneous Tasks

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