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refactor(types): let plugins type build info, stats fields, code generation data and tags - #22999
Follow-up to #22849. A plugin's own fields on webpack's open objects (buildInfo, assetInfo, stats output, code generation data, parser tag data) were typed any. They are now @augmentable interfaces a plugin extends by declaration merging, so its fields are checked everywhere they are read and written.
27 more augmentable types: build info and meta, asset info, module graph meta, records, loader additional data, normalized stats options, stats contexts, the 17 stats output types and the code generation schemas.
Parser tags carry their data type: Tag<T>, so tagVariable checks the data and getTagData returns T; plain symbol tags keep working. webpack's 7 data-carrying tags are typed, removing 2 casts.
Magic comment values are unknown, the user input they are; the two readers that skipped narrowing now narrow.
Undeclared keys still compile through the existing Record<string, any> fallbacks, each marked to drop in the next major.
lib/ type positions
main
this PR
EXPECTED_ANY
74
71
EXPECTED_FUNCTION
5
3
@augmentable types
7
34
What kind of change does this PR introduce?
refactor
Did you add tests for your changes?
No new test files; types only, apart from one "worker" in narrowing that parsing/import-worker-entry-option-warning covers. test/unitCases/magicComment.unittest.js narrows the now-unknown value. A type probe checks plugin augmentation on every new interface, typed and plain tags, and that undeclared keys still compile.
Does this PR introduce a breaking change?
No. Undeclared fields keep their any fallback and plain symbol tags keep working. markModuleAsErrored(error?: any) becomes (error?: unknown), which accepts the same arguments.
If relevant, what needs to be documented once your changes are merged or what have you already documented?
How to extend each type is in its JSDoc, which ships in types.d.ts.
Use of AI
Claude Code wrote the change and checked it with yarn lint, targeted unit and config tests and a type probe. The author reviewed it.
Reviewing files that changed from the base of the PR and between b8d1db9 and c91bb79.
Files ignored due to path filters: 1
types.d.ts is excluded by !types.d.ts
Files selected for processing: 1
lib/module/NormalModule.js
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Walkthrough
This change adds typed tag-data relationships to JavascriptParser and its tag users. It documents plugin-augmentable types across build, stats, and records, and refines several JSDoc types. It also adds a worker entry-option presence check. Most runtime behavior and symbol values remain unchanged.
JavascriptParser.Tag now relates a tag to its generic data type. getTagData and tagVariable use that relationship, and parser tags receive associated data types. Import handling checks for the worker property. Worker entry options use a typed record.
Plugin-augmentable type declarations lib/Compilation.js, lib/Compiler.js, lib/graph/ModuleGraph.js, lib/loaders/LoaderRunner.js, lib/module/Module.js, lib/stats/*, .changeset/210-plugin-declared-types.md
Build, compilation, module graph, loader, and stats types document declaration merging and are marked augmentable. TODO comments identify permissive record fallbacks for future removal. The changeset describes these type updates.
Code generation and type refinements lib/module/CodeGenerationResults.js, lib/css/syntax-parser.js, lib/errors/NonErrorEmittedError.js, lib/module/NormalModule.js, lib/util/magicComment.js, test/unitCases/magicComment.unittest.js, lib/dependencies/esm/ESMExportDependencyParserPlugin.js
getData uses a key-specific CodeGenValue type. Other JSDoc annotations are narrowed or made explicit. Export-specifier handling checks variable.name directly. The magic-comment test adds a RegExp cast.
Possibly related PRs
webpack/webpack#22849: Adds augmentable registries and type-generation support also used by these stats and build-info type updates.
No actionable merge-blocking risk remains in the reviewed change.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @lib/javascript/JavascriptParser.js:
- Line 458: Export the Tag<T> type from the public declarations so plugins can
reference it by name, and expose it as JavascriptParser.Tag if that is the
intended parser-qualified API. Keep getTagData and tagVariable typed with the
exported Tag<T>.
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Comparing base (d06b9ea) to head (c91bb79). Merging this pull request will not change the code webpack generates.
What moved
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Read Changed, test untouched first: the test is byte-identical on both sides, so webpack generated the difference. Changed, test edited moved partly because the test did — Test edit is how many bytes the test gained, and a bundle that grew by less is not a regression. New and Deleted are whole files, not deltas — a new asset was created, not grown, so it reads gray (⚪ added) — and adding tests cannot bury a real change. Gzip decides, because that is what users download; raw is the tiebreak, and brotli and zstd are per asset below.
Sample apps
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library amd
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library amd-require
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library assign
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library assign-properties
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library commonjs
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library commonjs-module
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library commonjs-static
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library commonjs2
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library global
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library jsonp
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library module
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library self
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library system
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library this
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library umd
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library var
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library window
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node-ssr
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node-ssr-esm
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react-100
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No asset changed size.
No runtime gained or lost a runtime module.
Built test/configCases with the defaults a user gets, and the apps in test/sizeCoreReports (apps/): 2333 test(s), 9847 asset(s), 103 emitted nothing.
Build info, build meta, asset info, module graph meta, stats contexts,
loader additional data and records become augmentable interfaces. Parser
tags carry the type of their data, and magic comment values are typed
as the unknown user input they are.
The stats output types, normalized stats options and code generation
schemas become augmentable, and CodeGenerationResults.getData returns
the type its key declares.
Merging this PR will degrade performance by 42.85%
2 warnings, 1 note
⚠️117 benchmarks are dominated by system calls
System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.
Some benchmarks with significant performance changes were compared across different runner types, so the changes might not come from the code. Run base and head on the same runner type, or use CodSpeed Macro Runners for more stable results.
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area: cssCSS support (lib/css)area: loadersLoader execution and loader API (lib/loaders)area: optimizationTree-shaking, splitChunks, concatenation, ids (lib/optimize, lib/ids)area: parserJavaScript parsing and dependency analysis (lib/javascript, lib/dependencies)area: typestypes.d.ts, JSDoc annotations, hand-maintained declarations
1 participant
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Summary
Follow-up to #22849. A plugin's own fields on webpack's open objects (
buildInfo,assetInfo, stats output, code generation data, parser tag data) were typedany. They are now@augmentableinterfaces a plugin extends by declaration merging, so its fields are checked everywhere they are read and written.Tag<T>, sotagVariablechecks the data andgetTagDatareturnsT; plainsymboltags keep working. webpack's 7 data-carrying tags are typed, removing 2 casts.unknown, the user input they are; the two readers that skipped narrowing now narrow.Record<string, any>fallbacks, each marked to drop in the next major.lib/type positionsmainEXPECTED_ANYEXPECTED_FUNCTION@augmentabletypesWhat kind of change does this PR introduce?
refactor
Did you add tests for your changes?
No new test files; types only, apart from one
"worker" innarrowing thatparsing/import-worker-entry-option-warningcovers.test/unitCases/magicComment.unittest.jsnarrows the now-unknownvalue. A type probe checks plugin augmentation on every new interface, typed and plain tags, and that undeclared keys still compile.Does this PR introduce a breaking change?
No. Undeclared fields keep their
anyfallback and plainsymboltags keep working.markModuleAsErrored(error?: any)becomes(error?: unknown), which accepts the same arguments.If relevant, what needs to be documented once your changes are merged or what have you already documented?
How to extend each type is in its JSDoc, which ships in
types.d.ts.Use of AI
Claude Code wrote the change and checked it with
yarn lint, targeted unit and config tests and a type probe. The author reviewed it.Generated by Claude Code
Summary by CodeRabbit