perf(runtime): combine co-located ESM export initialization by LingyuCoder · Pull Request #14801 · web-infra-dev/rspack

LingyuCoder · 2026-07-15T16:09:35Z

Summary

add a DEFINE_ESM_EXPORTS runtime module exposed as __webpack_require__.D / __rspack_context.D
compose the existing namespace marker and export getter helpers without changing either helper
emit the combined call only when the two operations were already co-located
keep non-circular modules with split start/end initialization unchanged
reuse existing runtime, tree-shaking, HMR, source-map, and stats tests for coverage

Motivation

ESM modules commonly emit adjacent namespace-marking and export-definition calls. Wrapping those operations reduces generated module call statements while preserving call order and initialization timing.

Behavior

circular or unknown ESM initialization that is already emitted together uses .D
proven non-circular modules keep the namespace marker at module start and export getters at module end
concatenated modules only combine adjacent marker/getter pairs
namespace-only paths continue to use the existing marker helper

Validation

pnpm run build:binding:dev
cargo fmt --all --check
git diff --check origin/main...HEAD
pnpm run test -t runtime-mode-module-rendering
pnpm run test -t cjs-tree-shaking-basic
pnpm run test -t webpack-reexport-namespace-and-default
pnpm run test -t runtime/circular
pnpm run test -t statsAPICases/exports
pnpm run test:unit (all relevant tests passed; the two existing parsing/dead-code-elimination variants still fail because their emitted test.js is missing)

github-actions · 2026-07-15T16:16:50Z

📦 Binary Size-limit

Comparing 0f00ff7 to fix: preserve createRequire().resolve with literal import.meta.url when requireResolve is disabled (#14783) by Fy

❌ Size increased by 28.00KB from 66.58MB to 66.61MB (⬆️0.04%)

codspeed-hq · 2026-07-15T16:42:21Z

Merging this PR will not alter performance

✅ 43 untouched benchmarks
⏩ 47 skipped benchmarks¹

_{Comparing seal/define-esm-exports (0f00ff7) with main (b8e3594)}

47 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. ↩

Copilot

Pull request overview

This PR introduces a new combined runtime helper for ESM export initialization so that when the namespace marker and export getter definitions are already emitted adjacent to each other (notably in circular/unknown ESM init paths and certain concatenation scenarios), they can be emitted as a single call (__webpack_require__.esm(...)) to reduce generated statements while preserving ordering/semantics.

Changes:

Add RuntimeGlobals::DEFINE_ESM_EXPORTS and a corresponding runtime module/template, exposed as __webpack_require__.esm / __rspack_context.esm.
Update ESM init-fragment rendering/merging so co-located namespace marker + export getter initialization can be combined into .esm(...) when appropriate (while keeping proven non-circular split start/end initialization unchanged).
Update concatenated-module namespace/export emission and refresh extensive runtime/tree-shaking/HMR/stats/source-map snapshots and assertions accordingly.

Reviewed changes

Copilot reviewed 145 out of 145 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/rspack-test/treeShakingCases/webpack-reexport-namespace-and-default/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)` for combined ESM init.
tests/rspack-test/treeShakingCases/webpack-innergraph-no-side-effects/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/webpack-inner-graph-switch/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/tree-shaking-lazy-import/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/tree-shaking-interop/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/transitive-bailout/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/import-star-as-and-export/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/export-star-chain/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/export-named-decl-as/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/export-imported-import-all-as/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/export_star/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/context-module/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/treeShakingCases/cjs-tree-shaking-basic/snapshots/treeshaking.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/statsOutputCases/simple-export/snapshots/stats.txt	Stats snapshot updated for increased runtime module count.
tests/rspack-test/statsOutputCases/side-effects-issue-7428/snapshots/stats.txt	Stats snapshot updated for increased runtime module count.
tests/rspack-test/statsOutputCases/runtime-specific-used-exports/snapshots/stats.txt	Stats snapshot updated for increased runtime module count.
tests/rspack-test/statsOutputCases/runtime-modules/snapshots/stats.txt	Stats snapshot updated to include `webpack/runtime/define_esm_exports`.
tests/rspack-test/statsOutputCases/match-resource-data-url/snapshots/stats.txt	Stats snapshot updated for increased runtime module count.
tests/rspack-test/statsOutputCases/filename/snapshots/stats.txt	Stats snapshot updated for increased runtime module count.
tests/rspack-test/statsOutputCases/dynamic-import/snapshots/stats.txt	Stats snapshot updated for increased runtime module count.
tests/rspack-test/statsAPICases/nested-modules.js	Inline snapshot updated for new asset/runtime sizes and module counts.
tests/rspack-test/statsAPICases/exports.js	Inline snapshot updated (hash/size/runtime modules) and includes new runtime module entry.
tests/rspack-test/statsAPICases/build-time-executed-runtime.js	Expectation updated to account for the additional runtime module.
tests/rspack-test/hotCases/worker/update-in-worker/snapshots/web/3.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/update-in-worker/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/update-in-worker/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/move-between-runtime/snapshots/web/7.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/move-between-runtime/snapshots/web/6.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/move-between-runtime/snapshots/web/5.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/move-between-runtime/snapshots/web/4.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/move-between-runtime/snapshots/web/3.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/move-between-runtime/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/move-between-runtime/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/issue-5597/snapshots/web/7.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/issue-5597/snapshots/web/6.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/issue-5597/snapshots/web/5.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/issue-5597/snapshots/web/4.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/issue-5597/snapshots/web/3.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/issue-5597/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/worker/issue-5597/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/unexpected-invalidation/used-exports/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/status/check/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/stats/chunks/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/source-map/enable/snapshots/web/3.snap.txt	HMR/source-map snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/source-map/enable/snapshots/web/2.snap.txt	HMR/source-map snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/source-map/enable/snapshots/web/1.snap.txt	HMR/source-map snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/source-map/disable/snapshots/web/3.snap.txt	HMR/source-map snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/source-map/disable/snapshots/web/2.snap.txt	HMR/source-map snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/source-map/disable/snapshots/web/1.snap.txt	HMR/source-map snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/sharing/share-plugin/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/require-disposed-module-warning/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/replace-runtime-module/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/import-after-download/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/hmr-circular/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/dispose-removed-module/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/dispose-removed-module/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/dispose-removed-chunk/snapshots/web/3.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/dispose-removed-chunk/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/dispose-removed-chunk/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/runtime/circular/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/recover/recover-after-self-error/snapshots/web/3.snap.txt	Recover snapshot updated; includes emitted `define_esm_exports` runtime module.
tests/rspack-test/hotCases/recover/recover-after-self-error/snapshots/web/1.snap.txt	Recover snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/recover/recover-after-removal-self-accepted/snapshots/web/2.snap.txt	Recover snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/recover/recover-after-removal-self-accepted/snapshots/web/1.snap.txt	Recover snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/recover/recover-after-parsing-error/snapshots/web/2.snap.txt	Recover snapshot updated; includes emitted `define_esm_exports` runtime module.
tests/rspack-test/hotCases/recover/recover-after-loader-error/snapshots/web/2.snap.txt	Recover snapshot updated; includes emitted `define_esm_exports` runtime module.
tests/rspack-test/hotCases/recover/recover-after-error/snapshots/web/2.snap.txt	Recover snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/recover/recover-after-error/snapshots/web/1.snap.txt	Recover snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/plugins/html/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/parsing/hot-api-optional-chaining/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/numeric-ids/add-remove-chunks/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/numeric-ids/add-remove-chunks/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/newTreeshaking/re-export-optimization/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/newTreeshaking/auto-reexport/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/module/build-info/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/make/rebuild-abnormal-module/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/make/issue-10915/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/make/fix-issuer/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/make/clean-isolated-module/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/make/clean-isolated-cycle/snapshots/web/3.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/make/clean-isolated-cycle/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/make/clean-isolated-cycle/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/loader/import-module-1/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/lazy-compilation/unrelated/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/lazy-compilation/unrelated/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/lazy-compilation/context/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/lazy-compilation/context/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/hashing/full-hash-main/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/hashing/exports-info-influence/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/hash/hot-index/snapshots/web/3.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/hash/hot-index/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/hash/hot-index/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/harmony/cjs-analyze-changed/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/harmony/auto-reexport/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/harmony/auto-import/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/harmony/auto-import-multiple/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/esm-dependency-import/module-hot/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/esm-dependency-import/import-meta-webpack-hot/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/errors/unaccepted/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/errors/unaccepted-ignored/snapshots/web/3.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/errors/unaccepted-ignored/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/errors/unaccepted-ignored/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/errors/self-decline/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/errors/events/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/errors/decline/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/errors/decline-webpackhot/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/disposing/runtime-independent-filename/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/disposing/remove-chunk-with-shared/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/disposing/remove-chunk-with-shared-in-other-runtime/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/determinism/issue-10174/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/define/issue-6962/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/css/recovery/snapshots/web/2.snap.txt	CSS HMR snapshot updated; includes emitted `define_esm_exports` runtime module.
tests/rspack-test/hotCases/css/css-extract/snapshots/web/1.snap.txt	CSS HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/context/request-position/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/conditional-runtime/accept-conditional/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/code-generation/this-in-accept/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/code-generation/this-in-accept-webpackhot/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/chunks/update-chunk-loading-runtime/snapshots/web/2.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/chunks/update-chunk-loading-runtime/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/chunks/system-import/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/chunks/dynamic-system-import/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/chunk/ensure-chunk-change-to-promise-all/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/chunk/accept-system-import/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/chunk/accept-system-import-webpackhot/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/child-compiler/issue-9706/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/hotCases/asset/parser-and-generator-states/snapshots/web/1.snap.txt	HMR snapshot updated for `.esm(...)` and size changes.
tests/rspack-test/configCases/runtime/runtime-mode-module-rendering/test.config.js	Assertion updates to ensure non-circular runtime-mode module rendering does not use `.esm`.
tests/rspack-test/configCases/runtime/runtime-mode-module-rendering/after.js	Updated “after” assertions mirroring the runtime-mode module rendering expectations.
tests/rspack-test/configCases/rslib/compact-external-dynamic-import-runtime/index.js	Test tightened to regex-match `__webpack_require__.e(` rather than substring check.
tests/rspack-test/configCases/builtin-swc-loader/input-source-map-module/index.js	Source-map test updated to include runtime source `define_esm_exports`.
tests/rspack-test/configCases/builtin-swc-loader/input-source-map-cheap-module/index.js	Source-map test updated to include runtime source `define_esm_exports`.
tests/rspack-test/builtinCases/swc-loader/minify/snapshots/output.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/builtinCases/rspack/dynamic-import/snapshots/output.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/builtinCases/plugin-wasm/imports-multiple/snapshots/output.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)` in async module wrappers.
tests/rspack-test/builtinCases/plugin-javascript/provide/snapshots/output.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/builtinCases/plugin-javascript/hashbang/snapshots/output.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
tests/rspack-test/builtinCases/plugin-javascript/builtins-define/snapshots/output.snap.txt	Snapshot updated to expect `__webpack_require__.esm(...)`.
crates/rspack_plugin_runtime/src/runtime_plugin.rs	Runtime plugin now emits `DefineEsmExportsRuntimeModule` when `DEFINE_ESM_EXPORTS` is required.
crates/rspack_plugin_runtime/src/runtime_module/runtime/define_esm_exports.ejs	New EJS runtime template that composes namespace marking + property getter definition.
crates/rspack_plugin_runtime/src/runtime_module/mod.rs	Runtime-module registry updated to include `define_esm_exports`.
crates/rspack_plugin_runtime/src/runtime_module/define_esm_exports.rs	New runtime module implementing `DEFINE_ESM_EXPORTS` emission and dependencies.
crates/rspack_plugin_javascript/src/dependency/esm/esm_compatibility_dependency.rs	Emits combined ESM export init fragment for circular/unknown cases; preserves non-circular split behavior.
crates/rspack_core/src/runtime_globals.rs	Adds `DEFINE_ESM_EXPORTS` and maps it to property name `esm`.
crates/rspack_core/src/init_fragment.rs	Enhances `ESMExportInitFragment` to optionally emit `.esm(...)` and merge `make_namespace_object` intent.
crates/rspack_core/src/concatenated_module.rs	Updates concatenated-module namespace/export emission to use `.esm(...)` when co-located.

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LingyuCoder added 8 commits July 15, 2026 23:48

perf(runtime): combine ESM export initialization

a5de844

fix(runtime): keep ESM helper dependencies runtime-local

2849876

test: harden ESM runtime output assertions

36e4aed

perf(concatenation): combine ESM export initialization

1f5207a

test: update combined ESM export output

70ce223

test: update combined ESM export hot snapshots

1d074a9

fix(runtime): only combine co-located ESM initialization

f0ffef9

test: update ESM runtime module expectations

368419a

test: remove dedicated ESM runtime cases

44848ea

LingyuCoder marked this pull request as ready for review July 15, 2026 16:42

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LingyuCoder added 2 commits July 16, 2026 00:53

chore: satisfy Clippy format lint

88a27f1

perf(runtime): shorten ESM helper name

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perf(runtime): combine co-located ESM export initialization#14801

perf(runtime): combine co-located ESM export initialization#14801
LingyuCoder wants to merge 11 commits into
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seal/define-esm-exports

LingyuCoder commented Jul 15, 2026 •

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github-actions Bot commented Jul 15, 2026 •

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codspeed-hq Bot commented Jul 15, 2026 •

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LingyuCoder commented Jul 15, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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github-actions Bot commented Jul 15, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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📦 Binary Size-limit

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codspeed-hq Bot commented Jul 15, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Merging this PR will not alter performance

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LingyuCoder commented Jul 15, 2026 •

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