Sandbox::https://redirect.github.com/rolldown/rolldown/issues/11177

hyfdev · 2026-10-10T02:09:58Z

Wrapped ESM re-export barrels can make an eager consumer load exports used only by a dynamic consumer. This feature routes independently initialized branches per consumer.

For #11091 with tree shaking and strictExecutionOrder: true, including on-demand wrapping:

Before (rendered modules in the initial static import closure):

entry.js, req.js, barrel.js, bar.js, foo.js

After:

entry.js, req.js, bar.js

Eligibility requires a proof that the entire static dependency graph initializes independently of outside state. It accepts inert allocations and reads of already initialized local bindings. Side-effect freedom alone is insufficient: export const snapshot = importedValue can change if initialization moves past a mutation.

Consumers share memoized module initializers, preserving live bindings and object identity. Opaque namespace consumers initialize all retained members; unproven graphs and direct require() of a barrel keep their existing initialization path.

Stacked on #11167. Part of #11091.

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codspeed · 2026-10-11T02:56:02Z

Merging this PR will not alter performance

⚠️

4 benchmarks spent significant time in system calls

System calls cannot be consistently instrumented, so they are not included in the measure, which understates the real cost. Please switch to the Walltime instrument to accurately measure system calls.

Measurement and system calls

bundle@threejs

bundle@threejs-sourcemap

bundle@multi-duplicated-top-level-symbol

bundle@rome_ts

✅ 7 untouched benchmarks
⏩ 10 skipped benchmarks¹

_{Comparing hyfdev/wrapped-reexport-opt-20261009 (38e1803) with hyfdev/issue11091-init-20261009 (fb63dcb)}

10 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

hyfdev · 2026-10-13T14:37:53Z

All three repros pass at 1456a1aed with the assertions from your comments:

codeSplitting: false keeps re-export initialization on the shared path (510883db5).
CJS export * skips shared initializer emission for re-exports whose consumers handle initialization (f847ed5ac).
onDemandWrapping with manual chunks retains cross-chunk initialization dependencies for namespace consumers without their own wrapper (510883db5).

@sapphi-red

## [1.2.14] - 2026-10-14 ### 🚀 Features - add `output.charset` option (#11194) by @sapphi-red - code-splitting: route independent ESM re-exports per consumer (#11177) by @hyfdev ### 🐛 Bug Fixes - handle `output.charset: 'ascii'` + `output.minify: false` (#11207) by @sapphi-red - tree-shaking: preserve initialization of wrapped ESM re-exports (#11167) by @hyfdev - sourcemap: preserve boundaries when tracing has no mapping (#11170) by @sapphi-red - strict-execution-order: account for init imports during code splitting (#11162) by @hyfdev - strict-execution-order: avoid eager loading through mixed re-exports (#11151) by @hyfdev - tree-shake expression statements that coerce known constants (#10825) by @IWANABETHATGUY - shim-missing-exports: shim deep namespace reads through default imports (#11184) by @IWANABETHATGUY - shim-missing-exports: shim missing static namespace members (#11179) by @hyfdev - preserve-entry-signatures: keep internal bindings out of entry exports (#11094) by @hyfdev - report ASSIGN_TO_IMPORT for writes to re-exported namespace members (#11148) by @IWANABETHATGUY - dev: keep files loaded by the HMR stage watched when the same task rebuilds (#11154) by @Brooooooklyn - dev: watch lazily compiled files even when a build starts first (#11152) by @Brooooooklyn - cjs: print a CommonJS module's top-level `this` as a wrapper parameter rolldown names (#11135) by @IWANABETHATGUY - renamer: keep fixed names off the bindings that would capture them (#11134) by @IWANABETHATGUY - renamer: keep an external `require()` local in a CJS module off the top-level names (#11133) by @IWANABETHATGUY - rolldown: make a repeated `close()` a no-op (#11142) by @Brooooooklyn - avoid renaming entry top-level bindings onto their nested bindings (#11122) by @IWANABETHATGUY - renamer: keep generated top-level names off inner bindings (#11121) by @IWANABETHATGUY ### 🚜 Refactor - renamer: treat a CJS-wrapped module's root scope as an inner scope (#11130) by @IWANABETHATGUY ### 📚 Documentation - add renaming design and implementation docs (#11131) by @IWANABETHATGUY ### ⚡ Performance - ci: overlap independent setup, checks, and artifacts (#11169) by @hyfdev ### 🧪 Testing - dev: use dunce::canonicalize so dev engine tests pass on Windows (#11192) by @shulaoda - preserve-entry-signatures: cover nested dynamic imports (#11164) by @hyfdev ### ⚙️ Miscellaneous Tasks - deps: upgrade oxc to 0.154.0 (#11209) by @shulaoda - make Security Analysis pass again (security-action v1.0.10, serde_yaml -> saphyr) (#11197) by @Brooooooklyn - deps: update rollup submodule for tests to v4.64.5 (#11190) by @rolldown-guard[bot] - deps: update test262 submodule for tests (#11191) by @rolldown-guard[bot] - deps: update crate-ci/typos action to v1.51.1 (#11174) by @renovate[bot] - vite-tests: link the workspace rolldown into the Vite clone again (#11147) by @Brooooooklyn Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>

hyfdev added this pull request to stack #11178 October 10, 2026 02:11

hyfdev marked this pull request as ready for review October 11, 2026 02:49

hyfdev requested review from IWANABETHATGUY and shulaoda as code owners October 11, 2026 02:49

Copilot AI balanced review requested due to automatic review settings October 11, 2026 02:49

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mattlewis92 mentioned this pull request Oct 13, 2026

fix(code-splitting): rebuild an absorbed dynamic entry's namespace from what its imports read #11200

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IWANABETHATGUY approved these changes Oct 14, 2026

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hyfdev force-pushed the hyfdev/wrapped-reexport-opt-20261009 branch from 1456a1a to 22a2959 Compare October 14, 2026 02:37

hyfdev added 4 commits October 14, 2026 11:09

feat(code-splitting): route independent ESM re-exports per consumer

ffcd3c1

fix(code-splitting): retain routed initialization dependencies

9fc2d62

fix(code-splitting): skip shared star re-export initialization

24b782b

fix(code-splitting): classify forwarding routes by retained statements

38e1803

hyfdev force-pushed the hyfdev/wrapped-reexport-opt-20261009 branch from 22a2959 to 38e1803 Compare October 14, 2026 03:09

hyfdev merged commit e148823 into main Oct 14, 2026
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hyfdev deleted the hyfdev/wrapped-reexport-opt-20261009 branch October 14, 2026 03:19

rolldown-guard Bot mentioned this pull request Oct 14, 2026

release: v1.2.14 #11210

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feat(code-splitting): route independent ESM re-exports per consumer - #11177

feat(code-splitting): route independent ESM re-exports per consumer#11177
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