test(code-splitting): pin CJS barrel fallback triggers and flag-off equivalence by hyfdev · Pull Request #10514 · rolldown/rolldown

hyfdev · 2026-07-29T06:44:52Z

The fallback decisions from #10488 — which barrel shapes must give up per-consumer routing — were mostly untested: of the rejecting triggers, only cycles and direct require() targets had fixtures, so a regressed decision would surface only as snapshot drift in unrelated fixtures. This PR pins every constructible trigger, plus the claim that a moduleSideEffects: false barrel executes the same set with the flag on and off, as runnable assertions. For example:

// barrel: one leaf carries top-level await → the whole barrel refuses routing
export { cn } from './cn.js';                            // contains `await Promise.resolve()`
export { default as cloneDeep } from './clone-deep.cjs';

// pinned: the entry initializes clone-deep eagerly —
// asserted as runtime events ['cn', 'clone-deep', 'main:a b'], not only as a snapshot

Stacked on #10513 (the carrier-declaration change) so the snapshots carry the final declaration shape.

Motivation

The routing side of the barrel fix is heavily fixtured, but the refusing side is load-bearing semantics with one-sided coverage. A wrong fallback decision — routing a shape that must stay monolithic, or vice versa — would not fail any test today; it would only drift snapshots elsewhere, which reads as noise. The strict/non-strict same-execution-set claim for side-effect boundaries was likewise argued in review, not asserted by a test.

New fixtures

Each fallback fixture runs a wrap-all and an on-demand cell and asserts both placement (the entry's static import closure) and runtime event order on Node:

cjs_reexport_barrel_tla_fallback — a top-level-await taint keeps the barrel monolithic: the unrelated CJS leaf joins the eager entry.
cjs_reexport_barrel_external_star_fallback — export * from an external module (dynamic exports) keeps the barrel monolithic; the external import and the CJS leaf both become eager.
cjs_reexport_barrel_cjs_export_star_fallback — export * from a CJS module keeps the barrel monolithic; star bindings resolve through the namespace merge.
cjs_reexport_barrel_shimmed_export_fallback — a shimmed missing export keeps the barrel monolithic; the shimmed binding reads undefined.
cjs_reexport_barrel_code_splitting_disabled — single-chunk output (codeSplitting: false, the current spelling of inlineDynamicImports). One observation here: the plans diverge. Wrap-all still routes per consumer, so the CJS leaf stays lazy behind the inlined import() trigger; on-demand sees no cross-chunk hazard in one chunk, leaves the barrel out of its wrap plan, and the monolithic interop body makes the leaf eager. Source order holds in both, and the eager-set gap is in wrap-all's favor, so the "wrap-all never executes more user code than on-demand" invariant stands — flagged in case on-demand should match wrap-all's laziness here, which this fixture would now catch.
cjs_reexport_barrel_effectful_carrier / cjs_reexport_barrel_side_effect_boundary gain a flag-off cell each: strict and non-strict execute the same eager and lazy sets, with one legitimate order difference the cells document — non-strict hoists generated CJS interop via lazy-init transfer, strict keeps each require at its re-export source position.

A concatenated-wrapper × barrel fixture is not constructible today: ConcatenateWrappedModuleKind::Inner/Root never arises on this branch (see the concatenate_basic fixture's _comment), so that eligibility guard remains future-proofing.

Validation

All fixtures pin current behavior — green here by construction; their value is turning a future fallback regression from silent snapshot drift into a named failure.

strict-execution-order fixtures: 106/106 (101 on the base branch, +5 new)
full --ignored integration corpus: no new failures relative to the base branch on this machine; this PR adds 5 passes
Test-only: no source files change in this PR.

Part of #10294.

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hyfdev · 2026-07-29T07:41:21Z

Merge activity

Jul 29, 7:41 AM UTC: The merge label 'graphite: merge-when-ready' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
Jul 29, 7:42 AM UTC: hyfdev added this pull request to the Graphite merge queue.
Jul 29, 7:50 AM UTC: Merged by the Graphite merge queue.

…quivalence (#10514) The fallback decisions from #10488 — which barrel shapes must give up per-consumer routing — were mostly untested: of the rejecting triggers, only cycles and direct `require()` targets had fixtures, so a regressed decision would surface only as snapshot drift in unrelated fixtures. This PR pins every constructible trigger, plus the claim that a `moduleSideEffects: false` barrel executes the same set with the flag on and off, as runnable assertions. For example: ```js // barrel: one leaf carries top-level await → the whole barrel refuses routing export { cn } from './cn.js'; // contains `await Promise.resolve()` export { default as cloneDeep } from './clone-deep.cjs'; // pinned: the entry initializes clone-deep eagerly — // asserted as runtime events ['cn', 'clone-deep', 'main:a b'], not only as a snapshot ``` Stacked on #10513 (the carrier-declaration change) so the snapshots carry the final declaration shape. ## Motivation The routing side of the barrel fix is heavily fixtured, but the refusing side is load-bearing semantics with one-sided coverage. A wrong fallback decision — routing a shape that must stay monolithic, or vice versa — would not fail any test today; it would only drift snapshots elsewhere, which reads as noise. The strict/non-strict same-execution-set claim for side-effect boundaries was likewise argued in review, not asserted by a test. ## New fixtures Each fallback fixture runs a wrap-all and an on-demand cell and asserts both placement (the entry's static import closure) and runtime event order on Node: - `cjs_reexport_barrel_tla_fallback` — a top-level-await taint keeps the barrel monolithic: the unrelated CJS leaf joins the eager entry. - `cjs_reexport_barrel_external_star_fallback` — `export *` from an external module (dynamic exports) keeps the barrel monolithic; the external import and the CJS leaf both become eager. - `cjs_reexport_barrel_cjs_export_star_fallback` — `export *` from a CJS module keeps the barrel monolithic; star bindings resolve through the namespace merge. - `cjs_reexport_barrel_shimmed_export_fallback` — a shimmed missing export keeps the barrel monolithic; the shimmed binding reads `undefined`. - `cjs_reexport_barrel_code_splitting_disabled` — single-chunk output (`codeSplitting: false`, the current spelling of `inlineDynamicImports`). One observation here: the plans diverge. Wrap-all still routes per consumer, so the CJS leaf stays lazy behind the inlined `import()` trigger; on-demand sees no cross-chunk hazard in one chunk, leaves the barrel out of its wrap plan, and the monolithic interop body makes the leaf eager. Source order holds in both, and the eager-set gap is in wrap-all's favor, so the "wrap-all never executes more user code than on-demand" invariant stands — flagged in case on-demand should match wrap-all's laziness here, which this fixture would now catch. - `cjs_reexport_barrel_effectful_carrier` / `cjs_reexport_barrel_side_effect_boundary` gain a `flag-off` cell each: strict and non-strict execute the same eager and lazy sets, with one legitimate order difference the cells document — non-strict hoists generated CJS interop via lazy-init transfer, strict keeps each require at its re-export source position. A concatenated-wrapper × barrel fixture is not constructible today: `ConcatenateWrappedModuleKind::Inner`/`Root` never arises on this branch (see the `concatenate_basic` fixture's `_comment`), so that eligibility guard remains future-proofing. ## Validation All fixtures pin current behavior — green here by construction; their value is turning a future fallback regression from silent snapshot drift into a named failure. - strict-execution-order fixtures: 106/106 (101 on the base branch, +5 new) - full `--ignored` integration corpus: no new failures relative to the base branch on this machine; this PR adds 5 passes - Test-only: no source files change in this PR. Part of #10294.

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## [1.2.1] - 2026-07-29 ### 🚀 Features - dev: support `hotUpdate` hook (#10305) by @h-a-n-a - dev: expose `disableWatcher` through the dev engine bindings (#10474) by @shulaoda - plugin: surface output-option callbacks in [PLUGIN_TIMINGS] (#10411) by @IWANABETHATGUY - `import.meta.ROLLDOWN_FILE_URL_<referenceId>_<urlId>` support to pass context to `resolveFileUrl` hook (#10297) by @sapphi-red - dev: skip the HMR update when a module's rebuilt output is unchanged (#10333) by @h-a-n-a - code-splitting: wrap strict execution order modules on demand (#10104) by @hyfdev - support `import.meta.ROLLDOWN_FILE_URL_*` (#10296) by @sapphi-red - implement `resolveFileUrl` plugin hook (#10291) by @sapphi-red - magic-string: support storeName on overwrite/update (#10312) by @IWANABETHATGUY ### 🐛 Bug Fixes - external: keep `__toESM` when the importing module is tree-shaken (#10516) by @IWANABETHATGUY - dev: resolve re-exports from externals through a real import (#10489) by @tbvjaos510 - code-splitting: route CJS barrel initialization per consumer (#10488) by @hyfdev - error: align filename-pattern diagnostics with Rollup's wording (#10501) by @IWANABETHATGUY - plugin: validate emitted prebuilt-chunk file names (#10399) by @IWANABETHATGUY - code-splitting: point a two-argument dynamic import at the chunk that holds the module (#10479) by @hyfdev - common: align is_path_fragment with Rollup's isPathFragment (#10398) by @IWANABETHATGUY - code-splitting: never name an internal chunk export `then` (#10480) by @hyfdev - code-splitting: avoid creating call-site-triggered entry facades (#10485) by @hyfdev - code-splitting: collect top-level eager order reasons in every strict build (#10463) by @hyfdev - code-splitting: let a cross-chunk dynamic importer carry the order trigger (#10456) by @hyfdev - code-splitting: avoid the dynamic-entry facade when the same-chunk collapse carries the trigger (#10433) by @hyfdev - binding: forward resolveId options.kind to callable builtin plugins (#10440) by @martijnwalraven - dev: keep the export name of `export * as ns from` (#10476) by @tbvjaos510 - code-splitting: only split an entry facade when something else can load its chunk (#10441) by @hyfdev - code-splitting: fold the runtime chunk back after order lowering (#10414) by @hyfdev - runtime: don't leave default undefined for cjs that fakes __esModule (#10453) by @IWANABETHATGUY - import-glob: escape generated string literals (#10438) by @shantanuraj - preserve-modules: don't assume every chunk mirrors a module (#10442) by @hyfdev - filter: treat missing hook inputs as non-matches, not panics (#10443) by @IWANABETHATGUY - code-splitting: keep CommonJS modules wrapped under strict execution order (#10405) by @hyfdev - code-splitting: align dynamicImports metadata with the rewritten import() specifier (#10430) by @hyfdev - dev: skip user plugin hooks for ?rolldown-lazy proxy modules (#10426) by @unknownjedi - treeshake: preserve side-effect-free spread arguments in manual-pure chains (#10432) by @IWANABETHATGUY - treeshake: preserve eagerly evaluated child effects of manual pure chains (#10427) by @Nic-Polumeyv - code-splitting: initialize pure definers behind star re-export barrels under strict execution order (#10409) by @hyfdev - resolveId: reject string `id` filters (must be a RegExp) (#10412) by @IWANABETHATGUY - code-splitting: collect eager order reasons for on-demand wrapping (#10387) by @hyfdev - rolldown: apply output.paths to CJS export-star of external modules (#10406) by @IWANABETHATGUY - dev: sourcemaps of lazily compiled chunks (#10386) by @tbvjaos510 - plugin: validate emitted file names at emitFile time (#10377) by @Nic-Polumeyv - guarantee tokio runtime release when close rejects (#10381) by @shulaoda - code-splitting: make strict transitive init registration deterministic and constant-time (#10320) by @hyfdev - pair tokio runtime acquire and release on wasm to prevent premature shutdown (#10363) by @shulaoda - don't body-demand modules from simulated facade chunk includes (#10351) by @IWANABETHATGUY - tracing: invalid RD_LOG filter and RD_LOG_OUTPUT=json no longer panic (#10343) by @Brooooooklyn - code-splitting: treat class definition-time global reads as order-sensitive (#10322) by @hyfdev - code-splitting: deconflict force-included runtime helper statements (#10336) by @hyfdev - binding: forward all missing parallel JS plugin hooks (#10345) by @Brooooooklyn - code-splitting: re-derive chunk exec order after the runtime sweep (#10334) by @hyfdev - types: add undefined to ExistingRawSourceMap optional properties (#10355) by @ocavue - magic-string: validate relocate ranges before rewiring (#10327) by @IWANABETHATGUY - add EMPTY_IMPORT_META warning for non-node CJS output (#10222) by @sapphi-red - call `resolveFileUrl` in a deterministic order (#10330) by @sapphi-red - magic-string: refuse repeated sendMagicString on a consumed instance (#10331) by @IWANABETHATGUY - magic-string: refuse to use a MagicString after sendMagicString consumed it (#10326) by @IWANABETHATGUY - magic-string: reject non-contiguous moves before rewiring the chunk list (#10311) by @IWANABETHATGUY - handle `./foo/bar` glob pattern the same as `foo/bar` (#10313) by @sapphi-red - magic-string: throw instead of panicking when append/prepend splits an edited chunk (#10301) by @IWANABETHATGUY - output: skip separator for empty hoisted functions (#10310) by @hyfdev - magic-string: don't report a change when edits cancel out (#10299) by @IWANABETHATGUY - sourcemap: map wrapped imported callees (#10288) by @hyfdev - magic-string: count positional inserts at index 0 on an empty source (#10306) by @IWANABETHATGUY - magic-string: return UTF-16 code units from length() (#10295) by @IWANABETHATGUY - output: skip separator for empty import prelude (#10289) by @hyfdev ### 🚜 Refactor - dev: make it easier to customize the runtime (#10338) by @sapphi-red - code-splitting: declare CJS carrier namespaces initializer-free (#10513) by @hyfdev - rollup-tests: avoid relying on `NODE_PATH` env var resolution (#10496) by @sapphi-red - code-splitting: derive symbol chunk ownership as pass-local link data (#10449) by @hyfdev - plugin: share asset emission helpers between copy_module and asset_module (#10450) by @Nic-Polumeyv - plugin: dedupe hook binding boilerplate (#10428) by @Nic-Polumeyv - plugin: share the oxc parse preamble between import-glob and dynamic-import-vars (#10452) by @Nic-Polumeyv - implement `GetAstBuilder` on visitor/pass types (#10424) by @overlookmotel - pass arrays to AST builder methods (#10419) by @overlookmotel - shorten AST builder code (#10418) by @overlookmotel - centralize final ESM init metadata (#10376) by @hyfdev - descriptor-based parallel-plugin detection (getParallelPluginInfo) (#10349) by @Brooooooklyn - remove AstFactory in favor of new_* construction traits (#10353) by @Boshen - enable oxc_ast's `disable_old_builder` feature (#10316) by @Boshen ### 📚 Documentation - development-guide: update config.json link line reference (#10523) by @dogledogle - clarify slash normalization for id hook filter (#10511) by @sapphi-red - code-splitting: record the thenable-namespace rule (#10502) by @hyfdev - clarify that `esmExternalRequirePlugin` must own its externals (#10439) by @TheAlexLichter - add troubleshooting entry for the @rolldown/binding-... resolution error (#10390) by @Nic-Polumeyv - add Code Splitting API reference category (#10382) by @vittorioexp ### ⚡ Performance - use VisitJsMut in JavaScript-only AST passes (#10507) by @Boshen - cache the resolved glob matcher for Id/ImporterId filters (#10410) by @IWANABETHATGUY - scope_hoisting: remove `alloc` field from `ScopeHoistingFinalizer` (#10425) by @overlookmotel - reduce string allocations (#10423) by @overlookmotel - hmr: remove unnecessary string allocations (#10422) by @overlookmotel - avoid allocating static strings via custom builder methods (#10421) by @overlookmotel - pass string literals to AST builder methods (#10420) by @overlookmotel - use VisitJs in JavaScript-only AST passes (#10396) by @Boshen - plugin: shrink erased plugin debug vtables (#10370) by @Boshen - reuse normalized path buffers (#10315) by @hyfdev ### 🧪 Testing - code-splitting: pin CJS barrel fallback triggers and flag-off equivalence (#10514) by @hyfdev - plugin: cover chunk fileName, absolute chunk name, and Windows drive names (#10400) by @IWANABETHATGUY - code-splitting: cover a single-chunk dynamic import of a wrapped module (#10505) by @hyfdev - file: remove the unused .dynamic_import fixture (#10481) by @hyfdev - treeshake: reduce manual-pure fixture to a minimal smoke test, move matrix to unit tests (#10436) by @IWANABETHATGUY - dev: run vite playgrounds under bundled dev (test-serve-bundled) (#10434) by @h-a-n-a - stop snapshots from silently hiding user code inside the runtime region (#10431) by @hyfdev - wasi: add tokio runtime lifecycle regression test (#10379) by @shulaoda - dev: expect preserved hot.data in hmr-whole-chain-dispose (#10380) by @h-a-n-a - code-splitting: pin flag-off wrapped-esm init emission (#10324) by @hyfdev - sourcemap: fix Windows-only failures in composition fixtures (#10368) by @shulaoda - generated-code: mark assert external in symbols_ns2 for deterministic output (#10339) by @hyfdev - code-splitting: cover entries-aware strict init cycle (#10307) by @hyfdev - make `just setup-vite` the only entry point that touches `vite/` (#10332) by @shulaoda - vite-tests: reuse the shared root vite checkout (#10325) by @shulaoda - test-dev-server: drop the vite submodule, track rolldown-canary (#10319) by @shulaoda - vite-tests: track the latest rolldown-canary rebased onto vite main (#10318) by @shulaoda - unify Vite in vite-test and test-dev-server (#10293) by @h-a-n-a ### ⚙️ Miscellaneous Tasks - scope the binding artifact download to `bindings-*` (#10525) by @shulaoda - deps: update napi (#10506) by @renovate[bot] - deps: update rollup submodule for tests to v4.62.3 (#10494) by @rolldown-guard[bot] - deps: upgrade oxc to 0.142.0 (#10497) by @shulaoda - deps: update test262 submodule for tests (#10495) by @rolldown-guard[bot] - deps: update github actions (#10460) by @renovate[bot] - deps: update rust crates (#10462) by @renovate[bot] - deps: update npm packages (#10461) by @renovate[bot] - metric: alert Discord when the metric workflow fails (#10447) by @IWANABETHATGUY - metric: mint a short-lived GitHub App token instead of a PAT (#10446) by @IWANABETHATGUY - repo: repair dangling CLAUDE.md symlink (#10451) by @hanayashiki - publint/package-metadata fixes and small correctness fixes (#10344) by @Brooooooklyn - deps: update dependency vite-plus to v0.2.6 (#10404) by @renovate[bot] - add Semgrep scan workflow (#10395) by @Boshen - enable Windows CI with a PR label (#10375) by @hyfdev - deps: upgrade oxc to 0.141.0 (#10373) by @camc314 - deps: update napi (#10369) by @renovate[bot] - deps: update test262 submodule for tests (#10367) by @rolldown-guard[bot] - deps: update taiki-e/install-action action to v2.83.3 (#10358) by @renovate[bot] - deps: update rust crates (#10357) by @renovate[bot] - deps: update npm packages (#10359) by @renovate[bot] - deps: update rust crate syn to v3 (#10362) by @renovate[bot] - deps: update rust crate oxc_sourcemap to v8.1.2 (#10356) by @renovate[bot] - deps: update dependency vite-plus to v0.2.5 (#10329) by @renovate[bot] - docs: migrate Netlify redirects to Void config (#10282) by @tux-tn - deps: update dependency rust to v1.97.1 (#10317) by @renovate[bot] - runtime: remove unused `runtime/index.js` (#10302) by @IWANABETHATGUY ### ❤️ New Contributors * @dogledogle made their first contribution in [#10523](#10523) * @tbvjaos510 made their first contribution in [#10489](#10489) * @martijnwalraven made their first contribution in [#10440](#10440) * @shantanuraj made their first contribution in [#10438](#10438) * @Nic-Polumeyv made their first contribution in [#10450](#10450) * @hanayashiki made their first contribution in [#10451](#10451) * @unknownjedi made their first contribution in [#10426](#10426) * @vittorioexp made their first contribution in [#10382](#10382) * @tux-tn made their first contribution in [#10282](#10282) Co-authored-by: shulaoda <165626830+shulaoda@users.noreply.github.com>

…he order-wrap plan is empty (#10544) With `strictExecutionOrder`, a CJS multi-entry build whose entries `require()` ESM forwarders into one shared re-export-only barrel over CJS leaves emits chunks that `require()` each other in a cycle and crash at startup: ``` TypeError: require_barrel.init_barrel is not a function ``` Fixes #10515. Regression from #10488, shipped in v1.2.1. ## Problem Consumer-local re-export routing is computed in three places: the pre-chunk placement probe, the on-demand projector probes, and real lowering. The probes run `consumer_local_reexport_plan` unconditionally, and its eligibility never reads the order-wrap plan — but real lowering sits behind the `plan.is_empty()` short-circuit in `apply_order_wraps`. When every reachable ESM module is already interop-wrapped (the CJS entries `require()` the forwarders), the order-wrap plan is empty. Chunk placement has already routed each barrel leaf to only its consuming entry's chunk, while emission keeps the barrel's monolithic interop body referencing the per-entry `require_*` wrappers — so the emitted chunks require each other in a startup cycle. The on-demand carrier force-add cannot rescue this: an interop-wrapped barrel never passes `is_order_wrap_eligible`, so the final plan can stay empty even when the wrap-all plan is not. That also rules out fixing this on the probe side — the probe runs before chunking, while the on-demand plan is only computed from the chunk graph afterwards. ## Fix Compute the consumer-local plan before the short-circuit and take the fast path only when both the order-wrap plan and the consumer-local plan are empty. Real lowering then materializes exactly the routes placement consumed, in both strict modes, and `lower_order_state` receives the precomputed plan instead of recomputing it. One exception keeps an existing contract: with code splitting disabled and at most one entry, placement has a single reachability bit, so the probe's routes moved nothing, and an inert on-demand plan keeps its promise of flag-off-equivalent output (pinned by `cjs_reexport_barrel_code_splitting_disabled` from #10514). The disabled option alone is not a sufficient key — only dynamic entries are dropped in disabled mode, so a plugin-emitted chunk still adds a second entry whose per-entry placement consumes the probe's routes — hence the exception is keyed on entry count as well. ## Test - `cjs_reexport_barrel_probe_plan_divergence`: the seven-file reproduction from #10515, wrap-all + on-demand variants. Crashes on current `main`, passes with the fix; the barrel becomes an empty routing waypoint and each entry initializes only its own leaf through a per-record memoized carrier. - `cjs_reexport_barrel_on_demand_inert_plan`: adds a plain-ESM third entry so the wrap-all plan is non-empty while the on-demand plan stays empty — the shape a probe-side gate could not fix. On current `main` the wrap-all variant passes and the on-demand variant crashes; both pass with the fix. - No existing snapshot changes — every previously covered configuration emits byte-identical output.

hyfdev marked this pull request as ready for review July 29, 2026 07:19

hyfdev requested review from IWANABETHATGUY and shulaoda as code owners July 29, 2026 07:19

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graphite-app Bot force-pushed the refactor/strict-order-carrier-decl branch from 015d5bc to fceac4c Compare July 29, 2026 07:33

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graphite-app Bot merged commit 92d617a into main Jul 29, 2026
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release: v1.2.1 #10524

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fix(code-splitting): materialize consumer-local barrel routing when the order-wrap plan is empty #10544

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test(code-splitting): pin CJS barrel fallback triggers and flag-off equivalence - #10514

test(code-splitting): pin CJS barrel fallback triggers and flag-off equivalence#10514
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