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Pull Request Overview
This PR fixes an issue where the inlineConst optimization was incorrectly inlining variables that could be mutated, when it should only inline truly constant values. The fix adds mutation checking to prevent inlining of mutable variables.
- Introduces mutation checking before adding symbols to the constant export map
- Refactors constant symbol insertion to use a new centralized method
- Adds test case demonstrating the fix for mutable variable handling
Reviewed Changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| crates/rolldown/src/ast_scanner/mod.rs | Adds adding_constant_symbol method with mutation checking logic |
| crates/rolldown/src/ast_scanner/impl_visit.rs | Refactors all constant symbol insertions to use the new centralized method |
| crates/rolldown/tests/rolldown/optimization/inline_const/issue_5902/main.js | Test file importing and using a mutable variable |
| crates/rolldown/tests/rolldown/optimization/inline_const/issue_5902/foo.mjs | Test module exporting a mutable variable and setter function |
| crates/rolldown/tests/rolldown/optimization/inline_const/issue_5902/artifacts.snap | Expected output showing the variable is not inlined due to mutation |
| crates/rolldown/tests/rolldown/optimization/inline_const/issue_5902/_config.json | Test configuration enabling inlineConst optimization |
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## [1.0.0-beta.35] - 2025-09-05 ### 🚀 Features - rolldown_plugin_vite_css_post: attch vite metadata to chunks (#6011) by @shulaoda - rolldown_plugin_vite_css_post: emit a single CSS asset for non–code-split builds (#6005) by @shulaoda - rolldown_plugin_vite_css_post: align empty CSS chunk removal logic (#6004) by @shulaoda - use frequent characters first for internal export names (#5524) by @AliceLanniste - rolldown_plugin_vite_css_post: align partial `generateBundle` logic (#5987) by @shulaoda - rolldown_plugin_vite_css_post: align `augmentChunkHash` logic (#5986) by @shulaoda - rolldown_watcher: introduce `WatcherConfig` for configurable watcher parameters (#5991) by @hyf0 - dev: support `import.meta.invalidate` and migrate tests (#5979) by @hyf0 - dev: adapt `TestDevServer` with `DevEngine` (#5976) by @hyf0 - propertyWriteSideEffects (#5977) by @IWANABETHATGUY - rolldown_plugin_vite_css_post: complete `transform` logic (#5985) by @shulaoda - dev: generate hmr updates for file changes (#5961) by @hyf0 - rolldown_plugin_vite_css_post: complete `finalize_css` (#5974) by @shulaoda - dev: manage cache by `DevEngine` (#5960) by @hyf0 - rolldown_plugin_vite_css_post: align `hoist_at_rules` (#5967) by @shulaoda - rolldown_plugin_vte_css_post: complete `resolve_asset_urls_in_css` (#5958) by @shulaoda - rolldown_plugin_utils: support common `to_output_file_path` (#5956) by @shulaoda - dev: default to not eager rebuild (#5949) by @hyf0 - treeshake.propertyReadSideEffects (#5945) by @IWANABETHATGUY - improve error message for `this.resolve` and `this.load` (#5596) by @sapphi-red - dev: accept `onHmrUpdates` callback (#5942) by @hyf0 - rolldown_plugin_vite_css_post: align partial `resolve_asset_urls_in_css` (#5929) by @shulaoda - mark `__export` runtime helper as pure (#5926) by @IWANABETHATGUY - rolldown_plugin_vite_css_post: extract `finalize_css_chunk` (#5916) by @shulaoda - implement inlineConst.pass (#5912) by @IWANABETHATGUY - rolldown_plugin_vite_css_post: align partial legacy logic (#5915) by @shulaoda - add inlineConst.pass options (#5911) by @IWANABETHATGUY - rolldown_plugin_vite_css_post: align partial css code split logic (#5906) by @shulaoda - inlineConst: safe (#5899) by @IWANABETHATGUY ### 🐛 Bug Fixes - rolldown: don't cleanup for browser build (#6024) by @sxzz - propertyWriteSideEffects for toplevel staticClassBlock (#5989) by @IWANABETHATGUY - handle `obj().prop` when `propertyReadSideEffects: false` (#5988) by @IWANABETHATGUY - handle objectSpread when `treeshake.propertyReadSideEffects` is enabled (#5981) by @IWANABETHATGUY - __toESM function breaking ES module imports (#5966) by @IWANABETHATGUY - merge `typescript.onlyRemoveTypeImports` correctly (#5962) by @shulaoda - should not generate `init_mod` when record is a ExportAllDeclaration and importee is a inner concatenate module (#5952) by @IWANABETHATGUY - use symbol existance to detect if a plugin is BuiltinPlugin (#5940) by @IWANABETHATGUY - handle errors thrown in `onLog` and `onwarn` options (#5931) by @sapphi-red - `replace_plugin` does not work as expected with .ts config (#5920) by @IWANABETHATGUY - `replace_plugin` support primitive values replacement (#5921) by @IWANABETHATGUY - node 20 test version (#5918) by @IWANABETHATGUY - trigger trace subscriber cleanup on Node.js side (#5913) by @sapphi-red - add friendly deprecation warning for `resolve.tsconfigFilename` (#5908) by @shulaoda - inlineConst inlines a var (#5903) by @IWANABETHATGUY - types: omit `sourcemap` property from `MinifyOptions` correctly (#5892) by @sapphi-red ### 🚜 Refactor - hmr: process changed files in one update (#6013) by @hyf0 - rolldown_plugin_vite_css_post: improve (#6006) by @shulaoda - migrate remaining crates from #[allow] to #[expect] attributes (#6002) by @hyf0 - crates/rolldown_common: migrate from #[allow] to #[expect] attributes (#6001) by @hyf0 - crates/rolldown_binding: migrate from #[allow] to #[expect] attributes (#6000) by @hyf0 - crates/rolldown: migrate from #[allow] to #[expect] attributes (#5999) by @hyf0 - extract all options usage in `impl_visit.rs` into `FlatOptionsFlag` (#5992) by @IWANABETHATGUY - rolldown_watcher: distinguish debounced and non-debounced watchers (#5990) by @hyf0 - dev: only use poll-based watch if required (#5984) by @hyf0 - dev: use dynamic dispatch watcher (#5982) by @hyf0 - improve plugin logic relate to `to_output_file_path` (#5959) by @shulaoda - make reference_needed_symbols lock free (#5964) by @IWANABETHATGUY - tweak module loader code (#5950) by @shulaoda - use less memory to store frequently accessed options field (#5948) by @IWANABETHATGUY - make `ecma_related` in `NormalModuleTaskResult` non-optional (#5947) by @shulaoda - dev: replace `BuildStatus` with `BuildStateMachine` (#5927) by @hyf0 - rename `inlineConst: 'safe'` to `inlineConst: 'smart'` (#5909) by @IWANABETHATGUY ### 📚 Documentation - add redirect for old plugin development page link (#5963) by @TheAlexLichter ### ⚡ Performance - rolldown: use allocator pool when minifying chunks (#5978) by @Boshen - merge two `PreProcessor` and `EnsureSpanUniqueness` (#5968) by @IWANABETHATGUY ### 🧪 Testing - cjs module lexer for named import external with cjs format (#5970) by @IWANABETHATGUY - hmr: import.meta.hot?.accept case (#5935) by @sapphi-red - hmr: accept outside circular case (#5938) by @sapphi-red - hmr: no accept outside circular dependencies case (#5937) by @sapphi-red - hmr: self accept within circular dependencies case (#5936) by @sapphi-red ### ⚙️ Miscellaneous Tasks - deps: update crate-ci/typos action to v1.36.2 (#6015) by @renovate[bot] - deps: update dependency rolldown-plugin-dts to ^0.16.0 (#6023) by @renovate[bot] - ci: re-enable WASM tests in CI workflows (#6007) by @hyf0 - deps: update crate-ci/typos action to v1.35.8 (#6012) by @renovate[bot] - clippy: enable allow_attributes lint and migrate to #[expect] (#6008) by @hyf0 - remove unmaintained AGENTS.md file (#6009) by @hyf0 - deps: update github-actions (#5993) by @renovate[bot] - fix `knip` warnings and remove redundant `@rolldown/testing` (#5973) by @shulaoda - deps: update dependency rolldown-plugin-dts to v0.15.10 (#5925) by @renovate[bot] - deps: update rust crate tracing-subscriber to v0.3.20 [security] (#5972) by @renovate[bot] - fix wasi build failed (#5969) by @shulaoda - deps: update crate-ci/typos action to v1.35.7 (#5965) by @renovate[bot] - remove redundant code (#5943) by @shulaoda - npm trusted publisher (#5953) by @Brooooooklyn - deps: update crate-ci/typos action to v1.35.6 (#5957) by @renovate[bot] - Revert "feat: mark `__export` runtime helper as pure (#5926)" (#5928) by @IWANABETHATGUY - deps: update dependency rolldown-plugin-dts to v0.15.10 (#5900) by @renovate[bot] - validator: improve the diagnostic message (#5919) by @shulaoda - add more tracing instrumentation (#5914) by @sapphi-red - add proper error message when passing unexpected minify options in rust test (#5905) by @IWANABETHATGUY - deps: update dependency tsdown to v0.14.2 (#5901) by @renovate[bot] - add automatic issue closing (#5895) by @shulaoda Co-authored-by: shulaoda <[email protected]>
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Now, only
VarDeclthat is not mutated will be added intoconstant_symbol_mapClosed #5902