refactor: type rule effect values, the typeof hook's node and the statement-type hook maps by alexander-akait · Pull Request #23309 · webpack/webpack · GitHub
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refactor: type rule effect values, the typeof hook's node and the statement-type hook maps - #23309
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Summary
Three type fixes, with no runtime change:
NormalModuleFactory reads each rule effect's value once, as unknown. The value is a loader for a use effect, or else the rule's value for the setting the effect is named for. It's only merged into the module's settings or handed on, so it no longer inherits the any of the rules' open option bags. This removes 12 untyped sites; the public EffectBasic/EffectUse types are unchanged.
The parser's preStatementByType and blockPreStatementByType are now TypedHookMap<Record<string, StatementHook>>. They're keyed by a statement's type name, so the parser's own interceptor that watches their keys gets a string instead of any. That removes 2 untyped sites. StatementHook names the hook type they already used.
The typeof hook is now handed a UnaryExpression. The hook takes [Expression], but the walk handed it a node typed only as Node. The interceptor's any[] arguments hid the mismatch. With typed interceptor arguments in tapable (fix: type the call and loop interceptor arguments as the hook's own tapable#288) it becomes a type error, so this fixes it ahead of that.
Untyped goes from 69 to 55. With webpack/tapable#288 it drops to 54 (the call interceptor in Compilation).
the parser, statement, declaration, ESM, rule, loader, generator and asset config cases;
NormalModuleFactory, RuleSet and JavascriptParser unit tests.
Does this PR introduce a breaking change?
No runtime change. In types.d.ts, preStatementByType and blockPreStatementByType change from HookMap<StatementHook> to TypedHookMap<Record<string, StatementHook>>. Their get/for keys are now typed string (a statement type name) instead of any, and the hook each returns is the same. Nothing else changes.
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 (investigation, implementation, verification and this description), directed and reviewed by me.
Refined internal type handling across JavaScript parsing and module rule processing. Loader selection and other runtime behavior remain unchanged, and there are no changes to user-facing functionality or capabilities. No new features or bug fixes are included in this update.
…ok's node
A rule effect's value is only merged into the module's settings or handed on as
a loader, so `NormalModuleFactory` reads it once as `unknown` instead of
inheriting the `any` of the rule's open option bags. The `typeof` hook takes
an `Expression`; the node the walk hands it is now typed `UnaryExpression`,
which a typed interceptor `call` in tapable requires.
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
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No actionable comments were generated in the recent review.
Walkthrough
The parser defines and uses a shared statement-hook type and adds a UnaryExpression annotation. The module rule loop stores effect values in an unknown local and applies branch-specific casts. Loader selection and settings merge behavior remain unchanged.
Changes: Type annotations
Layer / File(s)
Summary
Parser and rule effect types lib/javascript/JavascriptParser.js, lib/module/NormalModuleFactory.js
The parser hook maps use the shared StatementHook type, and a local is annotated as UnaryExpression. Rule effect values use an unknown local with casts for loader inputs and settings values.
Suggested labels:area: parser
Suggested reviewers:bjohansebas
Change: Refactor
Merge Risk: Minimal · up to 970c9
This is a type-only refactor with no runtime behavior change, so no actionable merge risk remains.
Pre-merge checks: 4
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Title check
The title uses the prefix "refactor:", which matches the required conventional-commit type and has no scope. It names the changes: typing rule effect values, the typeof hook's node, and the statement-…
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Explanation
The title uses the prefix "refactor:", which matches the required conventional-commit type and has no scope. It names the changes: typing rule effect values, the typeof hook's node, and the statement-type hook maps. These match the PR objectives and the raw summary. The title does not name the branch prefix, which the requirement also asks to match, so the branch name could not be checked from the provided context.
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Reviewing files that changed from the base of the PR and between 99128fd and 970c9cf.
Files ignored due to path filters: 1
types.d.ts is excluded by !types.d.ts
Files selected for processing: 1
lib/javascript/JavascriptParser.js
Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review.
Comparing base (bf1b2dc) to head (970c9cf). 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
No sample app changed size.
26 unchanged app(s)
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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 umd2
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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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react-1k
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react-1k-esm
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react-5k
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webworker
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webworker-esm
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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/): 2520 test(s), 10392 asset(s), 109 emitted nothing.
any counts EXPECTED_ANY, a written any and the any TypeScript infers where no type is written, such as const map = new Map() or const list = []. unknown counts a written unknown; ThrownValue, the unknown a throw or a rejected promise hands on, is left out. object counts EXPECTED_OBJECT and Object, Function counts EXPECTED_FUNCTION. Untyped counts the identifiers whose type is or holds any, wherever it comes from; the any TypeScript's built-in lib and Node.js's @types/node write in their own signatures, such as the replacer of String#replace or a stream's chunk, is left out, and so is the open fallback beside declared fields, such as KnownBuildInfo & Record<string, any>, though reading a key no field declares is counted.
Changed by this pull request
File
Typed lines
any
unknown
object
Function
untyped
lib/javascript/JavascriptParser.js
100.00%
1
0 (🟢 −2)
lib/module/NormalModuleFactory.js
100.00%
3 (🔴 +3)
3 (🟢 −12)
Where this pull request adds them, in every column it grows
lib/module/NormalModuleFactory.js:1057unknown
lib/module/NormalModuleFactory.js:1073unknown
lib/module/NormalModuleFactory.js:1075unknown
What the files this pull request changes still have
How many files a fresh Node.js process loads (require or import) to do each thing below; a change from the pull request's base is marked 🔴 when it grew and 🟢 when it shrank. Every file is startup time, so fewer is better. webpack files are this package's own (lib/, hot/); node_modules files are its dependencies'.
`preStatementByType` and `blockPreStatementByType` are keyed by a statement's
type, so they are `TypedHookMap<Record<string, StatementHook>>`, and the
interceptor that watches their keys gets a `string` rather than `any`.
alexander-akait
changed the title
refactor: type rule effect values as they are read, and the typeof hook's node
refactor: type rule effect values, the typeof hook's node and the statement-type hook maps
Nov 13, 2026
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Merging this PR will improve performance by 24.97%
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.
⚠️1 benchmark with a significant change ran on different hardware
Its base and head results were measured on machines with a different CPU, core count or memory, so the change might not come from the code. Run base and head on the same runner type.
Curious why performance improved? Comment @codspeedbot explain why performance improved on this PR, or directly use the CodSpeed MCP with your agent.
Comparing refactor/typed-tapable-interceptors (970c9cf) with main (bf1b2dc)
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alexander-akait
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Summary
Three type fixes, with no runtime change:
NormalModuleFactoryreads each rule effect's value once, asunknown. The value is a loader for auseeffect, or else the rule's value for the setting the effect is named for. It's only merged into the module's settings or handed on, so it no longer inherits theanyof the rules' open option bags. This removes 12 untyped sites; the publicEffectBasic/EffectUsetypes are unchanged.preStatementByTypeandblockPreStatementByTypeare nowTypedHookMap<Record<string, StatementHook>>. They're keyed by a statement's type name, so the parser's own interceptor that watches their keys gets astringinstead ofany. That removes 2 untyped sites.StatementHooknames the hook type they already used.typeofhook is now handed aUnaryExpression. The hook takes[Expression], but the walk handed it a node typed only asNode. The interceptor'sany[]arguments hid the mismatch. With typed interceptor arguments in tapable (fix: type the call and loop interceptor arguments as the hook's own tapable#288) it becomes a type error, so this fixes it ahead of that.Untyped goes from 69 to 55. With webpack/tapable#288 it drops to 54 (the
callinterceptor inCompilation).What kind of change does this PR introduce?
refactor
Did you add tests for your changes?
No, these are type-only changes. These pass:
NormalModuleFactory,RuleSetandJavascriptParserunit tests.Does this PR introduce a breaking change?
No runtime change. In
types.d.ts,preStatementByTypeandblockPreStatementByTypechange fromHookMap<StatementHook>toTypedHookMap<Record<string, StatementHook>>. Theirget/forkeys are now typedstring(a statement type name) instead ofany, and the hook each returns is the same. Nothing else changes.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 (investigation, implementation, verification and this description), directed and reviewed by me.
🤖 Generated with Claude Code
https://claude.ai/code/session_01HArJAXZagrHVVNLZZk9soh
Summary by CodeRabbit