fix: remove unused module namespace object exporting #7002
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Pull Request Overview
This PR fixes issue #4992 related to module namespace reference handling in the bundling process. The fix ensures that unused module namespace references are properly eliminated before chunk symbol deconfliction, particularly for scenarios involving re-exported external modules with the preserveModules option.
Key changes:
- Introduces a new
finalized_module_namespace_ref_usage()method to clean up unused module namespace references before deconflicting chunk symbols - Adds filtering logic to skip unused symbols when building cross-chunk export relationships
- Simplifies module namespace declaration logic by moving the reference check earlier in the pipeline
Reviewed Changes
Copilot reviewed 12 out of 12 changed files in this pull request and generated 7 comments.
Show a summary per file
| File | Description |
|---|---|
crates/rolldown/src/stages/generate_stage/code_splitting.rs |
Adds new finalized_module_namespace_ref_usage() function to eliminate unused namespace references |
crates/rolldown/src/stages/generate_stage/mod.rs |
Calls the new finalization method and removes parallel iteration in AST processing |
crates/rolldown/src/stages/generate_stage/compute_cross_chunk_links.rs |
Adds filtering to skip unused symbol references in cross-chunk linking |
crates/rolldown/src/module_finalizers/mod.rs |
Simplifies namespace declaration logic by using pre-computed reference flags |
crates/rolldown/src/utils/chunk/render_chunk_exports.rs |
Contains debug statements for export rendering (should be removed) |
crates/rolldown/src/ecmascript/format/esm.rs |
Contains debug statement for exports rendering (should be removed) |
crates/rolldown/tests/rolldown/issues/4992/* |
New test case files for reproducing and validating the fix for issue #4992 |
crates/rolldown/tests/snapshots/integration_rolldown__filename_with_hash.snap |
Updated snapshot with new test case and hash changes from code modifications |
crates/rolldown/tests/rolldown/topics/hmr/issue_4818/artifacts.snap |
Updated snapshot reflecting changes in generated code structure |
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Benchmarks Rust |
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Feel like we should should remove |
hyf0
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is not an issue? It it a correct link? |
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**Isuses** - Before, when hmr is enabled, every `module_namespace` export object is generated but some of them are not included in `used_symbol_refs`. - Before, some module namespace object is not generated but included in `used_symbol_refs`. (e.g. indirect external module reexport)export * from "@sentry/node"  This pr syncs `module_namespace` usage before code generation(both module level and chunk level), so that we could use `used_symbol_ref` to determine if a module namespace ref is used or not. Closed #6922
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This was referenced Nov 19, 2025
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## [1.0.0-beta.51] - 2025-11-19 ### 💥 BREAKING CHANGES - rolldown_plugin_vite_react_refresh_wrapper: add vite prefix (#7086) by @shulaoda - rolldown_plugin_vite_web_worker_post: add vite prefix (#7085) by @shulaoda - rolldown_plugin_vite_wasm_helper: add vite prefix (#7084) by @shulaoda - rolldown_plugin_vite_wasm_fallback: add vite prefix (#7083) by @shulaoda - rolldown_plugin_vite_transform: add vite prefix (#7082) by @shulaoda - rolldown_plugin_vite_reporter: add vite prefix (#7081) by @shulaoda - rolldown_plugin_vite_module_preload_polyfill: add vite prefix (#7080) by @shulaoda - rolldown_plugin_vite_manifest: add vite prefix (#7079) by @shulaoda - rolldown_plugin_vite_load_fallback: add vite prefix (#7072) by @shulaoda - rolldown_plugin_vite_json: add vite prefix (#7071) by @shulaoda - rolldown_plugin_vite_import_glob: add vite prefix (#7070) by @shulaoda - rolldown_plugin_vite_html_inline_proxy: add vite prefix (#7069) by @shulaoda - rolldown_plugin_vite_dynamic_import_vars: add vite prefix (#7068) by @shulaoda - rolldown_plugin_vite_build_import_analysis: add vite prefix (#7067) by @shulaoda - rolldown_plugin_vite_asset_import_meta_url: add vite prefix (#7066) by @shulaoda - rolldown_plugin_vite_alias: add vite prefix (#7065) by @shulaoda - rolldown_plugin_vite_asset_plugin: add vite prefix (#7064) by @shulaoda ### 🚀 Features - export sync APIs to experimental (#7122) by @shulaoda - rolldown_plugin_vite_asset_import_meta_url: implement template literal support for dynamic URLs (#7118) by @shulaoda - rolldown_plugin_vite_asset_import_meta_url: implement AST-based URL detection (#7113) by @shulaoda - add isPathFragment validation for filename patterns (rollup compat) (#7101) by @IWANABETHATGUY - rolldown_plugin_vite_asset_import_meta_url: align filter logic (#7103) by @shulaoda - rolldown: oxc v0.98.0 (#6961) by @camc314 - show error contexts for unhandleable errors (#7095) by @sapphi-red - rolldown_plugin_utils: extract `get_hash` utility function (#7059) by @shulaoda - rolldown_plugin_asset: initialize `CSSEntriesCache` (#7015) by @shulaoda - rolldown_plugin_vite_html: align `transformIndexHtml` logic (#7010) by @shulaoda - builtin-plugin: support `bindingifyViteHtmlPlugin` (#7008) by @shulaoda - impl `generatedCode.symbols` for reexport dynamic modules. (#6993) by @IWANABETHATGUY - rolldown_plugin_manifest: support v2 logic (#6979) by @shulaoda - support Node.js `module.exports` ESM export (#6967) by @Copilot - change "could not clean directory" from error to warning (#6955) by @Copilot - rolldown_binding: add context to errors thrown by plugin hooks (#6964) by @sapphi-red ### 🐛 Bug Fixes - content hash should be affected by the minify behavior (#7102) by @hyf0 - `canonical name not found for "__toESM"` error when only named imports are used from a CJS module (#7094) by @sapphi-red - preserve directory structure in chunk names with preserveModules (#6872) by @IWANABETHATGUY - rolldown_plugin_asset: correct bundle deletion index calculation (#7063) by @shulaoda - rolldown_plugin_utils: correct string slicing in `render_asset_url_in_js` (#7061) by @shulaoda - rolldown_plugin_vite_html: use transformed result in asset URL handling (#7060) by @shulaoda - rolldown_plugin_vite_html: skip redundant path resolution for processed URLs (#7058) by @shulaoda - rolldown_plugin_vite_css_post: data race in CSS URL processing (#7055) by @shulaoda - rolldown_plugin_vite_css_post: always compute css asset dirname in build command (#7054) by @shulaoda - rolldown_plugin_vite_css: ensure consistent url in import and export (#7053) by @shulaoda - rolldown_plugin_vite_css_post: use `get_or_insert_default` for `HTMLProxyResult` (#7052) by @shulaoda - rolldown_plugin_vite_css: skip `commonjs-proxy` CSS requests (#7050) by @shulaoda - rolldown_plugin_utils: correct `is_css_module` (#7049) by @shulaoda - rolldown_plugin_utils: correct `is_css_request` (#7048) by @shulaoda - rolldown_plugin_vite_html: use correct inline module index (#7046) by @shulaoda - rolldown_plugin_vite_html: correct scripts url update logic (#7045) by @shulaoda - rolldown_plugin_vite_html: fallback to original url on NotFound error (#7043) by @shulaoda - rolldown_plugin_vite_html: move src_tasks to correct branch (#7040) by @shulaoda - rolldown_plugin_vite_html: correct `handle_style_tag_or_attribute` (#7038) by @shulaoda - builtin-plugin: add `config` to `htmlInlineProxyPlugin` (#7036) by @shulaoda - missing CJS default export when SafelyMergeCjsNs optimization is enabled (#7006) by @Copilot - reserve global names before deconflicting external symbols (#7022) by @IWANABETHATGUY - rolldown_plugin_build_import_analysis: process all bundle outputs correctly (#7020) by @shulaoda - rolldown_plugin_vite_css_post: process all bundle outputs correctly (#7019) by @shulaoda - rolldown_plugin_vite_css_post: remove `/*$vite$:1*/` correctly (#7018) by @shulaoda - rolldown_plugin_vite_html: use correct span for `style_urls` (#7017) by @shulaoda - rolldown_plugin_vite_html: track full element span from start to end tag (#7016) by @shulaoda - builtin-plugin: correct `viteHtmlPlugin` related logic (#7013) by @shulaoda - remove unused module namespace object exporting (#7002) by @IWANABETHATGUY - rust/dev: allow to recover from hmr rebuild failure (#6991) by @hyf0 - rust/dev: `ensure_latest_bundle_output` shouldn't loop infinitely (#6974) by @hyf0 - rust/dev: `DevEngine#ensure_latest_bundle_output` should schedule a rebuild task if there're no queued tasks (#6968) by @hyf0 - add Symbol.toStringTag to module facades when generatedCode.symbols is enabled (#6784) by @Copilot ### 🚜 Refactor - extension checking to use constant array (#7057) by @Copilot - rust/devtools: tweak namings and introduction comments (#7028) by @hyf0 - rolldown_plugin_vite_html: use `root` instead of `cwd` (#7035) by @shulaoda - rolldown_plugin_vite_css_post: use `root` instead of `cwd` (#7034) by @shulaoda - rolldown_plugin_vite_css: use `root` instead of `cwd` (#7033) by @shulaoda - rolldown_plugin_transform: use `root` instead of `cwd` (#7032) by @shulaoda - rolldown_plugin_reporter: use `root` instead of `cwd` (#7031) by @shulaoda - rolldown_plugin_asset: use `root` instead of `cwd` (#7030) by @shulaoda - rolldown_plugin_html_inline_proxy: use `root` instead of `cwd` (#7029) by @shulaoda - rust/dev: remove dead code of `rolldown_dev` crate (#6997) by @hyf0 - rust: move dev related code into new `rolldown_dev` crate (#6996) by @hyf0 - rolldown_resolver: use consistent generic parameter name `Fs` (#6998) by @shulaoda - rolldown_resolver: improve resolve method clarity and documentation (#6986) by @shulaoda - rename `is_module_facade()` to `is_entry_point()` for clarity (#6994) by @IWANABETHATGUY - rust/dev: unwrap `Result<_>` from the return type of `BundleCoordinator::schedule_build_if_stale` (#6980) by @sapphi-red - rolldown_resolver: reorganize impl blocks (#6984) by @shulaoda - rolldown_resolver: extract configuration logic into separate module (#6983) by @shulaoda - rolldown_resolver: improve error messages (#6982) by @shulaoda - rust/dev: rename `CoordinatorStatus` to `CoordinatorStateSnapshot` (#6973) by @hyf0 - rust/dev: replace `InitialBuildState` with `CoordinatorState` (#6972) by @hyf0 - ast_scanner: derive `Debug`, `Clone`, `Copy` for `CjsGlobalAssignmentType` (#6971) by @camc314 - rust: filter out devtools specific events for normal tracing (#6965) by @hyf0 - rust/dev: replace `CoordinatorMsg::HasLatestBuildOutput` with `GetStatus` (#6960) by @hyf0 - rust/dev: `ensure_current_build_finish` shouldn't block the coordinator's event loop (#6959) by @hyf0 ### 📚 Documentation - in-depth/directives: remove TODOs and fix code (#7112) by @sapphi-red - clarify concepts of rolldown's test infra (#7047) by @hyf0 - contrib/style: add suggestions about choosing file names (#6989) by @hyf0 ### ⚡ Performance - rolldown_plugin_vite_css_post: cache CSS URL processing results (#7056) by @shulaoda - remove unnecessary `collect_vec` (#6999) by @IWANABETHATGUY ### 🧪 Testing - add testcase for #6880 and #6879 (#7107) by @IWANABETHATGUY - vite-tests: use integration branch for vite compatibility tests (#7091) by @shulaoda ### ⚙️ Miscellaneous Tasks - remove redundant chunk level linefeed (#7109) by @IWANABETHATGUY - pin oxc-minify to 0.97.0 (#7108) by @IWANABETHATGUY - deps: update oxc apps (#7104) by @renovate[bot] - deps: update glob for security (#7105) by @shulaoda - rolldown: add aliases for renamed vite plugins (#7087) by @shulaoda - automate weekly beta releases (#7089) by @Boshen - deps: update dependency oxlint-tsgolint to v0.7.0 (#7088) by @renovate[bot] - deps: update github-actions (#7075) by @renovate[bot] - deps: update dependency oxlint-tsgolint to v0.6.0 (#7037) by @renovate[bot] - deps: update npm packages (#7076) by @renovate[bot] - deps: update rust crates (#7077) by @renovate[bot] - add retry to flaky tests (#7041) by @sapphi-red - rust: rename `rolldown_debug` to `rolldown_devtools` (#7026) by @hyf0 - deps: update crate-ci/typos action to v1.39.2 (#7001) by @renovate[bot] - ai/github: make copilot review check rust api style (#6988) by @hyf0 - move test `recover_from_initial_build_error` to `error_recovery/from_initial_build_syntax_error` (#6990) by @hyf0 - oxlint: enable `typescript/consistent-type-imports` rule (#6987) by @shulaoda - deps: update crate-ci/typos action to v1.39.1 (#6975) by @renovate[bot] - build.ts: separate import type (#6921) by @iiio2 - format rolldown runtime (#6966) by @IWANABETHATGUY Co-authored-by: shulaoda <[email protected]>
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Isuses
module_namespace export object is generated but some of them are not included inused_symbol_refs.used_symbol_refs. (e.g. indirect external module reexport)export * from "@sentry/node"
This pr syncs
module_namespaceusage before code generation(both module level and chunk level), so that we could useused_symbol_refto determine if a module namespace ref is used or not.Closed #6992