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fix: return the value of every module type from importModule() - #22869
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Build-time execution reads the executed module as JavaScript in its own chunk graph instead of each generator counting importModule() as a JavaScript consumer, so the real bundle gets no extra code. Code generation there also follows codeGenerationDependencies.
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npm i -D webpack@https://pkg.pr.new/webpack@22869
yarn add -D webpack@https://pkg.pr.new/webpack@22869
pnpm add -D webpack@https://pkg.pr.new/webpack@22869 |
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Priority: ➖ Normal Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to
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Inline comments:
Review comments at @lib/Compilation.js:
- Around line 6422-6425: Include the effective source types set by
chunkGraph.setChunkModuleSourceTypes in code-generation cache identity, either
through NormalModule.updateHash or the cache key, so distinct source-type sets
cannot reuse the same result. Add a caching-enabled test that imports the CSS
module before directly importing its image and verifies the image’s JavaScript
source is available.
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⛔ Files ignored due to path filters: 1
test/configCases/loader-import-module/build-time-types/image.pngis excluded by!**/*.png
📒 Files selected for processing: 11
.changeset/020-import-module-build-time-types.mdlib/Compilation.jslib/css/CssGenerator.jstest/configCases/loader-import-module/build-time-types/file.txttest/configCases/loader-import-module/build-time-types/index.jstest/configCases/loader-import-module/build-time-types/loader.jstest/configCases/loader-import-module/build-time-types/plain.csstest/configCases/loader-import-module/build-time-types/style.csstest/configCases/loader-import-module/build-time-types/text.csstest/configCases/loader-import-module/build-time-types/values.jstest/configCases/loader-import-module/build-time-types/webpack.config.js
💤 Files with no reviewable changes: 1
- lib/css/CssGenerator.js
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Read No asset that both runs emit changed size — everything below is new or deleted. 4 asset(s) this pull request adds
No runtime that both runs build changed which runtime modules it carries. 1 runtime(s) this pull request adds or no longer builds
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🦋 Changeset detectedLatest commit: 5022a93 The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [webpack](https://github.com/webpack/webpack) | [`5.112.0` → `5.112.2`](https://renovatebot.com/diffs/npm/webpack/5.112.0/5.112.2) |  |  | --- >⚠️ **Warning** > > Some dependencies could not be looked up. Check the [Dependency Dashboard](issues/99) for more information. --- ### Release Notes <details> <summary>webpack/webpack (webpack)</summary> ### [`v5.112.2`](https://github.com/webpack/webpack/blob/HEAD/CHANGELOG.md#51122) [Compare Source](webpack/webpack@v5.112.1...v5.112.2) ##### Patch Changes - Reduce repeated scans when concatenating imported modules. (by [@​xiaoxiaojx](https://github.com/xiaoxiaojx) in [#​22865](webpack/webpack#22865)) - Avoid allocating CSS module sets for single-group chunks. (by [@​xiaoxiaojx](https://github.com/xiaoxiaojx) in [#​22866](webpack/webpack#22866)) - Return the value of every module type loaded with `importModule()`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22869](webpack/webpack#22869)) ### [`v5.112.1`](https://github.com/webpack/webpack/blob/HEAD/CHANGELOG.md#51121) [Compare Source](webpack/webpack@v5.112.0...v5.112.1) ##### Patch Changes - Rebuild a lazy barrel in watch when what it defers changes, and keep the imports and re-exports it still runs. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22699](webpack/webpack#22699)) - Rebuild under `cacheUnaffected` a module whose re-export target goes or returns. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22749](webpack/webpack#22749)) - Fix "Self-reference dependency has unused export name" for CommonJS namespace re-exports. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22791](webpack/webpack#22791)) - Fix `exportType: "style"` CSS modules throwing outside the runtime chunk. (by [@​lazerg](https://github.com/lazerg) in [#​22833](webpack/webpack#22833)) - Fix crash when a CSS module with `exportType: "style"` imports an ignored stylesheet. (by [@​codeXsidd](https://github.com/codeXsidd) in [#​22846](webpack/webpack#22846)) - Keep empty process environment variables that `.env` files don't define in `DotenvPlugin`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22794](webpack/webpack#22794)) - Rehash an ESM entry chunk when a chunk it imports by file name changes. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22804](webpack/webpack#22804)) - Handle a NUL inside an HTML CDATA section the way the parsing spec does. (by [@​dependabot](https://github.com/apps/dependabot) in [#​22811](webpack/webpack#22811)) - Keep module exports live across chunks, runtimes, HMR and eval, sparing globals. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22733](webpack/webpack#22733)) - Await asynchronous modules that `ProvidePlugin` injects into ES modules. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22728](webpack/webpack#22728)) - Keep a resolve that ends after the compiler closed from throwing. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22795](webpack/webpack#22795)) - Preserve string names passed to SharedWorker constructors. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22770](webpack/webpack#22770)) - Preserve string contents when extracting source map comments. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22768](webpack/webpack#22768)) - Scope strict-mode, async and generator block function declarations to their block. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22800](webpack/webpack#22800)) - Preserve raw dotenv values when reusing cached environment files. (by [@​Eshiv-Pandey](https://github.com/Eshiv-Pandey) in [#​22787](webpack/webpack#22787)) - Preserve assigned or patched built-ins, conversions and pattern targets. (by [@​aryanraj45](https://github.com/aryanraj45) in [#​22761](webpack/webpack#22761)) - Keep globals a `globalThis` write replaces, and `slice` on a patched array. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22862](webpack/webpack#22862)) - Skip HTML script tags for shared chunks that emit no JavaScript. (by [@​bjohansebas](https://github.com/bjohansebas) in [#​22779](webpack/webpack#22779)) - Keep the digits Firefox lays out a minified CSS percentage with. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22718](webpack/webpack#22718)) - Reject a second `srcset` descriptor after a `0x` density descriptor. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22741](webpack/webpack#22741)) - Minify JavaScript faster, folding string methods on constants and `x -= 1`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22823](webpack/webpack#22823)) - Shorten minified JavaScript, and keep it running like its source. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22717](webpack/webpack#22717)) - Drop more unused functions, arguments, calls, global reads and variable copies when minifying JavaScript. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22789](webpack/webpack#22789)) - Minify JavaScript smaller where swc does, and fold a function's `length` right. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22826](webpack/webpack#22826)) - Reduce JavaScript output size where oxc or swc produce smaller output. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22829](webpack/webpack#22829)) - Update watchpack to 2.6.3 and rebuild on a `node_modules` created mid-build. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22743](webpack/webpack#22743)) - Support `concatenateModules` with `cacheUnaffected`. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22746](webpack/webpack#22746)) - Update schema-utils to 4.8.1. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22774](webpack/webpack#22774)) - Keep CSS fallbacks, vendor overrides, `oklch()` hues and HTML elements. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22753](webpack/webpack#22753)) - Validate `CleanPlugin` and `DotenvPlugin` options with a precompiled check, so valid options no longer compile their schema at startup. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22758](webpack/webpack#22758)) - Speed up startup and CSS minification, sharing the compile cache with workers. (by [@​xiaoxiaojx](https://github.com/xiaoxiaojx) in [#​22706](webpack/webpack#22706)) - Use precise, generic types for modules, parsers, generators, stats and loaders. (by [@​alexander-akait](https://github.com/alexander-akait) in [#​22731](webpack/webpack#22731)) </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - "before 9am on tuesday" - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0NC4xNzUuMSIsInVwZGF0ZWRJblZlciI6IjQ0LjE3NS4xIiwidGFyZ2V0QnJhbmNoIjoiZGV2ZWxvcCIsImxhYmVscyI6WyJkZXBlbmRlbmNpZXMiLCJyZW5vdmF0ZSJdfQ==--> Reviewed-on: https://code.futo.org/harbor/harbor/pulls/2035
Summary
Closes #22863.
importModule()adds its dependency without an origin module, so a module that only a loader executes has no consumer and gets no JavaScript output. The call then resolves to{}. CountingimportModule()as a JavaScript consumer in each generator (asCssGeneratoralready did) leaks that JavaScript into the real bundle too. Instead,executeModulenow asks for JavaScript in its own build-time chunk graph, and the CSS special case is gone. Build-time code generation also followscodeGenerationDependencies, so a stylesheet withurl()no longer fails withNo code generation entry for asset/resource|….this.importModule(…)asset,asset/inline{}"data:text/plain;base64,…"asset/resource{}"/public/assets/file.txt"asset/source{}"asset\n"asset/bytes{}Uint8Arrayurl(./image.png)Real bundle (
main.js) when a stylesheet is both linked and loaded withimportModule(): 1,424 B before (an empty JS module plus the__webpack_require__runtime), 223 B after.What kind of change does this PR introduce?
fix
Did you add tests for your changes?
Yes,
test/configCases/loader-import-module/build-time-types/. It covers every asset type, an asset and a stylesheet the bundle also reads from CSS (checking that neither gets JavaScript output), and a stylesheet withurl().Does this PR introduce a breaking change?
No.
If relevant, what needs to be documented once your changes are merged or what have you already documented?
n/a
Use of AI
Written with Claude Code at the maintainer's request: it traced the cause, compared approaches against real builds, wrote the fix and the test, and ran the
importModulecases andyarn lintlocally.Generated by Claude Code
Summary by CodeRabbit
importModule()now returns values for all loaded module types, including assets and CSS.importModule()no longer add JavaScript size to build output.importModule()no longer incorrectly affect whether a module is treated as a JavaScript consumer.