feat: skip unused external modules from IIFE parameter list#7978
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Pull request overview
This PR improves the IIFE format output by excluding side-effect-only external modules from the function parameter list, since their exports are not actually used in the code. For UMD format, all externals (including side-effect-only ones) are still included to maintain proper module loading behavior across different environments.
Changes:
- Introduced
ExternalImportKindenum to categorize external imports as eitherUsedorSideEffectOnly - Modified
render_chunk_external_importsto return categorized external imports instead of raw module references - Updated IIFE format to filter out side-effect-only externals from factory parameters
- Maintained UMD format behavior to include all externals for proper CommonJS/AMD loading
Reviewed changes
Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.
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| File | Description |
|---|---|
crates/rolldown/src/ecmascript/format/utils/mod.rs |
Added ExternalImportKind enum to categorize externals and updated render_chunk_external_imports to return categorized imports |
crates/rolldown/src/ecmascript/format/iife.rs |
Filtered IIFE factory parameters to only include externals with used exports |
crates/rolldown/src/ecmascript/format/umd.rs |
Preserved UMD behavior by mapping all categorized externals back to modules |
crates/rolldown/tests/rolldown/function/format/iife/side_effect_only_external/* |
Added test case for IIFE with side-effect-only external |
crates/rolldown/tests/rolldown/function/format/umd/side_effect_only_external/* |
Added test case for UMD with side-effect-only external |
crates/rolldown/tests/rolldown/function/format/iife/external_modules/artifacts.snap |
Updated snapshot showing node:fs removed from parameters |
crates/rolldown/tests/snapshots/integration_rolldown__filename_with_hash.snap |
Updated hashes for affected test cases |
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Benchmarks Rust |
IWANABETHATGUY
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Jan 21, 2026
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close vitejs/rolldown-vite#451 I don't think the previous behavior was wrong. This PR slightly improves the output.
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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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close vitejs/rolldown-vite#451
I don't think the previous behavior was wrong. This PR slightly improves the output.