feat: merge allow-extension emitted chunks#7940
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Pull request overview
This PR implements chunk merging optimization for emitted chunks with AllowExtension preserve entry signatures. When emitted chunks are captured by manual code splitting groups, they can now be merged into those groups while preserving their exports, avoiding unnecessary facade chunks and improving bundle efficiency.
Changes:
- Introduced
PostChunkOptimizationOperationbitflags to track chunk removal and export preservation status - Replaced simple
removed_chunk_idxset with a more granularpost_chunk_optimization_operationsmap - Enhanced chunk optimizer to detect and handle export name conflicts when merging emitted chunks
- Added two comprehensive integration tests verifying the optimization works correctly
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Copilot reviewed 21 out of 21 changed files in this pull request and generated 1 comment.
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| File | Description |
|---|---|
| crates/rolldown_common/src/lib.rs | Added export for PostChunkOptimizationOperation |
| crates/rolldown_common/src/chunk/mod.rs | Defined new PostChunkOptimizationOperation bitflags with Removed and PreserveExports flags |
| crates/rolldown/src/chunk_graph.rs | Replaced removed_chunk_idx field with post_chunk_optimization_operations map for more granular tracking |
| crates/rolldown/src/stages/generate_stage/chunk_optimizer.rs | Implemented export conflict detection and selective chunk merging logic for emitted chunks |
| crates/rolldown/src/stages/generate_stage/render_chunk_to_assets.rs | Updated filtering to check PostChunkOptimizationOperation::Removed flag |
| crates/rolldown/src/stages/generate_stage/compute_cross_chunk_links.rs | Updated filtering logic to preserve chunks with PreserveExports flag |
| crates/rolldown/tests/rolldown/mod.rs | Added optimization test module |
| crates/rolldown/tests/rolldown/optimization/mod.rs | Declared chunk_merging test module |
| crates/rolldown/tests/rolldown/optimization/chunk_merging/mod.rs | Declared two test submodules |
| crates/rolldown/tests/rolldown/optimization/chunk_merging/allow_extension_exports/* | Test case for emitted chunks with conflicting export names |
| crates/rolldown/tests/rolldown/optimization/chunk_merging/allow_extension_merge_same_exports/* | Test case for emitted chunks with shared exports |
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crates/rolldown/tests/rolldown/optimization/chunk_merging/allow_extension_exports/mod.rs
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two tests are copy from https://github.com/rollup/rollup/pull/5891/changes#diff-ea0e02dc15a6e6644c297b9768846aa2a20ad85d037918ba53b20ccbe84aa82aR1 related to #5726 rollup related pr rollup/rollup#5891
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## [1.0.0-rc.1] - 2026-01-22 ### 🚀 Features - debug_info: add facade chunk elimination reason (#7980) by @IWANABETHATGUY - support lazy barrel optimization (#7933) by @shulaoda - add `experimental.lazyBarrel` option (#7908) by @shulaoda - skip unused external modules from IIFE parameter list (#7978) by @sapphi-red - add custom panic hook for better crash reporting (#7752) by @shulaoda - treeshake: add `invalidImportSideEffects` option (#7958) by @shulaoda - merge allow-extension emitted chunks (#7940) by @IWANABETHATGUY - nativeMagicString generateMap (#7944) by @IWANABETHATGUY - Include meta.magicString in RenderChunkMeta (#7943) by @IWANABETHATGUY - debug_info: add debug info for eliminated facade chunks (#7946) by @IWANABETHATGUY - stablize `strictExecutionOrder` and move to `output.strictExecutionOrder` from `experimental.strictExecutionOrder` (#7901) by @sapphi-red - add documentation link to require() error message (#7898) by @Copilot - add `codeSplitting: boolean` and deprecate `inlineDynamicImports` (#7870) by @hyf0 - dev: change lazy module URL to `/@vite/lazy` from `/lazy` (#7884) by @sapphi-red ### 🐛 Bug Fixes - transform JS files containing `</script>` to escape template literals (#7987) by @IWANABETHATGUY - apply avoid-breaking-exported-api = false to clippy.toml and fix clippy errors (#7982) by @Boshen - pass `kind` from `this.resolve` (#7981) by @sapphi-red - rolldown_plugin_vite_resolve: ignore yarn resolution errors and fallback to other resolvers (#7968) by @sapphi-red - renamer: prevent renaming symbols when there no conflicts (#7936) by @Dunqing - correct minifyInterExports when emitted chunk got merged (#7941) by @IWANABETHATGUY - deduplicate entry points when module is both emitted and dynamically imported (#7885) by @IWANABETHATGUY - dev: add `@vite-ignore` to lazy compilation proxy module import (#7883) by @sapphi-red ### 🚜 Refactor - rust: enable clippy nursery lint group (#8002) by @Boshen - rust: fix inconsistent_struct_constructor clippy lint (#7999) by @Boshen - rust: fix needless_pass_by_ref_mut clippy lint (#7994) by @Boshen - rust: fix unnecessary_wraps clippy lint (#7993) by @Boshen - rust: fix enum_variant_names clippy lint (#7992) by @Boshen - fix single_match clippy lint (#7997) by @Boshen - rust: fix redundant_clone clippy lint (#7996) by @Boshen - rust: rename CJS to Cjs to follow upper_case_acronyms lint (#7991) by @Boshen - rust: remove unnecessary Box wrapper around Vec in MemberExprRef (#7990) by @Boshen - import_record: make resolved_module optional (#7907) by @shulaoda - remove unnecessary `.parse` (#7966) by @sapphi-red - remove unused `ImportRecordMeta::IsPlainImport` (#7948) by @shulaoda - proper set chunk meta (#7939) by @IWANABETHATGUY - module_loader: remove `try_spawn_with_cache` (#7920) by @shulaoda - link_stage: simplify `ImportStatus::NoMatch` to unit variant (#7909) by @shulaoda - improve global scope symbol reservation in chunk deconfliction (#7906) by @IWANABETHATGUY - simplify ast unwrapping in generate stage (#7900) by @IWANABETHATGUY - generate_stage: optimize cross-chunk imports computation (#7889) by @shulaoda - link_stage: move runtime require logic into match branch (#7892) by @shulaoda - link_stage: simplify runtime require reference conditions (#7891) by @shulaoda - link_stage: inline and simplify external dynamic import check (#7890) by @shulaoda - generate_stage: simplify external module import collection logic (#7887) by @shulaoda - avoid redundant module lookup in TLA computation (#7886) by @shulaoda - dev: `devEngine.compileEntry` does not return null (#7882) by @sapphi-red - dev: fix type errors for test HMR runtime (#7881) by @sapphi-red - dev: move `clientId` property to `DevRuntime` base class (#7880) by @sapphi-red - dev: generate client id in browser (#7878) by @hyf0 ### 📚 Documentation - apis: organize hook filters documentation and add composable filters section (#8003) by @sapphi-red - update `vitepress-plugin-group-icons` (#7947) by @yuyinws - add in-depth documentation for lazy barrel optimization (#7969) by @shulaoda - bump theme & update activeMatch for reference (#7963) by @mdong1909 - mark `build()` API as experimental (#7954) by @sapphi-red - enhance search functionality with improved scoring and filtering logic (#7935) by @hyf0 - add minor comments to multiple types (#7930) by @sapphi-red - refactor advanedChunks related content to adapt manual code splitting concept (#7925) by @hyf0 - apis: add content to Bundler API page (#7926) by @sapphi-red - apis: restructure plugin API related docs (#7924) by @sapphi-red - add plugin API docs (#7923) by @sapphi-red - apis: add docs to important APIs (#7913) by @sapphi-red - move the important APIs to the top of the sidebar (#7912) by @sapphi-red - apis: add more content to CLI documentation (#7911) by @sapphi-red - apis: generate CLI docs from --help output (#7910) by @sapphi-red - add fathom analytics (#7896) by @mdong1909 ### ⚡ Performance - use u32 for string indices in string_wizard and rolldown to reduce memory usage (#7989) by @IWANABETHATGUY - rust: remove all usages of `with_scope_tree_child_ids(true)` for `SemanticBuilder` (#7995) by @Dunqing - renamer: skip unnecessary nested scope symbol processing (#7899) by @Dunqing - module_loader: use ArcStr for importer_id to avoid string copy (#7922) by @shulaoda - module_loader: defer `ModuleTaskOwner` construction until needed (#7921) by @shulaoda - renamer: optimize symbol renaming by eliminating `rename_non_root_symbol` pass (#7867) by @Dunqing ### 🧪 Testing - add lazy barrel optimization test cases (#7967) by @shulaoda ### ⚙️ Miscellaneous Tasks - remove lazy barrel option (#8010) by @shulaoda - mark watch API as experimental (#8004) by @sapphi-red - deps: update dependency lodash-es to v4.17.23 [security] (#8001) by @renovate[bot] - git ignore zed local config (#7988) by @IWANABETHATGUY - setup publint for published packages (#7972) by @Copilot - enable `tagged_template_transform ` uncondionally (#7975) by @IWANABETHATGUY - deps: update oxc to v0.110.0 (#7964) by @renovate[bot] - deps: update oxc apps (#7962) by @renovate[bot] - ai: add upgrade-oxc Claude skill (#7957) by @Boshen - deps: update rollup submodule for tests to v4.55.2 (#7959) by @sapphi-red - deps: update test262 submodule for tests (#7960) by @sapphi-red - deps: update crate-ci/typos action to v1.42.1 (#7961) by @renovate[bot] - deps: update rust crates (#7951) by @renovate[bot] - deps: update npm packages (#7953) by @renovate[bot] - deps: update github-actions (#7952) by @renovate[bot] - deps: update npm packages (#7950) by @renovate[bot] - format magic-string test before write to disk (#7945) by @IWANABETHATGUY - deps: update dependency rolldown-plugin-dts to ^0.21.0 (#7915) by @renovate[bot] - deps: update dependency oxlint-tsgolint to v0.11.1 (#7914) by @renovate[bot] - deps: update dependency diff to v8.0.3 [security] (#7904) by @renovate[bot] - remove outdated TODO comment in `collect_depended_symbols` (#7888) by @shulaoda - deps: update oxc resolver to v11.16.3 (#7876) by @renovate[bot]
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two tests are copy from https://github.com/rollup/rollup/pull/5891/changes#diff-ea0e02dc15a6e6644c297b9768846aa2a20ad85d037918ba53b20ccbe84aa82aR1
related to #5726
rollup related pr rollup/rollup#5891