[compiler] Fix set-state-in-effect false negative with NewExpression default param#36107
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mofeiZ merged 1 commit intofacebook:mainfrom Apr 8, 2026
Merged
[compiler] Fix set-state-in-effect false negative with NewExpression default param#36107mofeiZ merged 1 commit intofacebook:mainfrom
mofeiZ merged 1 commit intofacebook:mainfrom
Conversation
…default param
When a component function has a destructured prop with a NewExpression
default value (e.g. `{ value = new Number() }`), the compiler would
bail out during BuildHIR when trying to lower the default value via
`lowerReorderableExpression`. This caused `validateNoSetStateInEffects`
to never run, silently suppressing the set-state-in-effect diagnostic.
The fix adds a 'NewExpression' case to `isReorderableExpression`, treating
it the same as 'CallExpression' — safe to reorder when the callee and all
arguments are themselves reorderable (e.g., global identifiers and literals).
Fixes facebook#36101
Contributor
Author
|
👋 Gentle ping — just checking if this is still on the radar for review. Happy to address any feedback or rebase if needed! |
Contributor
|
Looking at this again, you're right in that we already allow for function calls (which also may be side-effectful). My main worry here is reordering across function / constructor calls, but it looks like our lowering should preserve that |
This was referenced Apr 18, 2026
736-c41-2c1-e464fc974
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Apr 27, 2026
This MR contains the following updates: | Package | Type | Update | Change | OpenSSF | |---|---|---|---|---| | [@typescript-eslint/eslint-plugin](https://typescript-eslint.io/packages/eslint-plugin) ([source](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/eslint-plugin)) | devDependencies | minor | [`8.58.2` → `8.59.0`](https://renovatebot.com/diffs/npm/@typescript-eslint%2feslint-plugin/8.58.2/8.59.0) | [](https://securityscorecards.dev/viewer/?uri=github.com/typescript-eslint/typescript-eslint) | | [@typescript-eslint/parser](https://typescript-eslint.io/packages/parser) ([source](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/parser)) | devDependencies | minor | [`8.58.2` → `8.59.0`](https://renovatebot.com/diffs/npm/@typescript-eslint%2fparser/8.58.2/8.59.0) | [](https://securityscorecards.dev/viewer/?uri=github.com/typescript-eslint/typescript-eslint) | | [ajv](https://ajv.js.org) ([source](https://github.com/ajv-validator/ajv)) | dependencies | minor | [`8.18.0` → `8.20.0`](https://renovatebot.com/diffs/npm/ajv/8.18.0/8.20.0) | [](https://securityscorecards.dev/viewer/?uri=github.com/ajv-validator/ajv) | | [eslint-plugin-react-hooks](https://react.dev/) ([source](https://github.com/facebook/react/tree/HEAD/packages/eslint-plugin-react-hooks)) | devDependencies | minor | [`7.0.1` → `7.1.1`](https://renovatebot.com/diffs/npm/eslint-plugin-react-hooks/7.0.1/7.1.1) | [](https://securityscorecards.dev/viewer/?uri=github.com/facebook/react) | | [react-toastify](https://github.com/fkhadra/react-toastify) | dependencies | minor | [`11.0.5` → `11.1.0`](https://renovatebot.com/diffs/npm/react-toastify/11.0.5/11.1.0) | [](https://securityscorecards.dev/viewer/?uri=github.com/fkhadra/react-toastify) | | [typescript-eslint](https://typescript-eslint.io/packages/typescript-eslint) ([source](https://github.com/typescript-eslint/typescript-eslint/tree/HEAD/packages/typescript-eslint)) | devDependencies | minor | [`8.58.2` → `8.59.0`](https://renovatebot.com/diffs/npm/typescript-eslint/8.58.2/8.59.0) | [](https://securityscorecards.dev/viewer/?uri=github.com/typescript-eslint/typescript-eslint) | | [vite-plugin-static-copy](https://github.com/sapphi-red/vite-plugin-static-copy) | devDependencies | minor | [`4.0.1` → `4.1.0`](https://renovatebot.com/diffs/npm/vite-plugin-static-copy/4.0.1/4.1.0) | [](https://securityscorecards.dev/viewer/?uri=github.com/sapphi-red/vite-plugin-static-copy) | --- ### Release Notes <details> <summary>typescript-eslint/typescript-eslint (@​typescript-eslint/eslint-plugin)</summary> ### [`v8.59.0`](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/eslint-plugin/CHANGELOG.md#8590-2026-04-20) [Compare Source](typescript-eslint/typescript-eslint@v8.58.2...v8.59.0) ##### 🚀 Features - **eslint-plugin:** \[no-unnecessary-type-assertion] report more cases based on assignability ([#​11789](typescript-eslint/typescript-eslint#11789)) ##### ❤️ Thank You - Ulrich Stark See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.59.0) for more information. 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This is now fixed. - Add deprecated no-op `component-hook-factories` rule for backwards compatibility. ([@​mofeiZ](https://github.com/mofeiZ) in [#​36307](facebook/react#36307)) ### [`v7.1.0`](https://github.com/facebook/react/blob/HEAD/packages/eslint-plugin-react-hooks/CHANGELOG.md#710) [Compare Source](https://github.com/facebook/react/compare/408b38ef7304faf022d2a37110c57efce12c6bad...eslint-plugin-react-hooks@7.1.0) This release adds ESLint v10 support, improves performance by skipping compilation for non-React files, and includes compiler lint improvements including better `set-state-in-effect` detection, improved ref validation, and more helpful error reporting. - Add ESLint v10 support. ([@​azat-io](https://github.com/azat-io) in [#​35720](facebook/react#35720)) - Skip compilation for non-React files to improve performance. ([@​josephsavona](https://github.com/josephsavona) in [#​35589](facebook/react#35589)) - Fix exhaustive deps bug with Flow type casting. ([@​jorge-cab](https://github.com/jorge-cab) in [#​35691](facebook/react#35691)) - Fix `useEffectEvent` checks in component syntax. ([@​jbrown215](https://github.com/jbrown215) in [#​35041](facebook/react#35041)) - Improved `set-state-in-effect` validation with fewer false negatives. ([@​jorge-cab](https://github.com/jorge-cab) in [#​35134](facebook/react#35134), [@​josephsavona](https://github.com/josephsavona) in [#​35147](facebook/react#35147), [@​jackpope](https://github.com/jackpope) in [#​35214](facebook/react#35214), [@​chesnokov-tony](https://github.com/chesnokov-tony) in [#​35419](facebook/react#35419), [@​jsleitor](https://github.com/jsleitor) in [#​36107](facebook/react#36107)) - Improved ref validation for non-mutating functions and event handler props. ([@​josephsavona](https://github.com/josephsavona) in [#​35893](facebook/react#35893), [@​kolvian](https://github.com/kolvian) in [#​35062](facebook/react#35062)) - Compiler now reports all errors instead of stopping at the first. ([@​josephsavona](https://github.com/josephsavona) in [#​35873](https://github.com/facebook/react/pull/35873)–[#​35884](https://github.com/facebook/react/pull/35884)) - Improved source locations and error display in compiler diagnostics. ([@​nathanmarks](https://github.com/nathanmarks) in [#​35348](facebook/react#35348), [@​josephsavona](https://github.com/josephsavona) in [#​34963](facebook/react#34963)) </details> <details> <summary>fkhadra/react-toastify (react-toastify)</summary> ### [`v11.1.0`](https://github.com/fkhadra/react-toastify/releases/tag/v11.1.0) [Compare Source](fkhadra/react-toastify@v11.0.5...v11.1.0) ### Release Notes #### Features - **CSP nonce support.** `<ToastContainer nonce={...}>` applies the nonce to the injected `<style>` tag. Closes [#​1209](fkhadra/react-toastify#1209). #### Fixes - `onChange` fires `status: 'removed'` synchronously on `toast.dismiss()` instead of after the exit animation — observers (incl. `useNotificationCenter`) now see correctly ordered events. Also guards against double-`onClose`. Closes [#​1275](fkhadra/react-toastify#1275). - Touch drag no longer re-pauses the toast on release — the old check compared a PointerEvent against `'touchend'`, which never matched. Closes [#​1217](fkhadra/react-toastify#1217). - Vertical drag now visually moves the toast (`--y` gets a unit). Thanks [@​janpaepke](https://github.com/janpaepke), [#​1277](fkhadra/react-toastify#1277). - Stacked scale is clamped at 0.5, preventing zero/negative scale in deep stacks. Closes [#​1171](fkhadra/react-toastify#1171), [#​1174](fkhadra/react-toastify#1174). - Stacked container respects mobile `100vw` again. Closes [#​1234](fkhadra/react-toastify#1234). #### Accessibility - `role="progressbar"` now includes `aria-valuenow`, `aria-valuemin`, `aria-valuemax`. Thanks [@​singhankit001](https://github.com/singhankit001), [#​1283](fkhadra/react-toastify#1283). Closes [#​1259](fkhadra/react-toastify#1259). #### Internal - Migrated to a pnpm workspace (`pnpm link .` no longer required for contributors). Publish layout unchanged — addon still ships inside the main package. - CSS now injected at mount via `useStyleSheet` (prerequisite for `nonce`). - Dep bumps: TypeScript 6, Vite 8, Cypress 15, React 19.2, plus the rest. - CI: `upload-artifact` v3 → v4. Thanks to [@​janpaepke](https://github.com/janpaepke), [@​singhankit001](https://github.com/singhankit001), and reporters of the fixed issues. </details> <details> <summary>typescript-eslint/typescript-eslint (typescript-eslint)</summary> ### [`v8.59.0`](https://github.com/typescript-eslint/typescript-eslint/blob/HEAD/packages/typescript-eslint/CHANGELOG.md#8590-2026-04-20) [Compare Source](typescript-eslint/typescript-eslint@v8.58.2...v8.59.0) This was a version bump only for typescript-eslint to align it with other projects, there were no code changes. See [GitHub Releases](https://github.com/typescript-eslint/typescript-eslint/releases/tag/v8.59.0) for more information. You can read about our [versioning strategy](https://typescript-eslint.io/users/versioning) and [releases](https://typescript-eslint.io/users/releases) on our website. </details> <details> <summary>sapphi-red/vite-plugin-static-copy (vite-plugin-static-copy)</summary> ### [`v4.1.0`](https://github.com/sapphi-red/vite-plugin-static-copy/blob/HEAD/CHANGELOG.md#410) [Compare Source](https://github.com/sapphi-red/vite-plugin-static-copy/compare/vite-plugin-static-copy@4.0.1...vite-plugin-static-copy@4.1.0) ##### Minor Changes - [#​251](sapphi-red/vite-plugin-static-copy#251) [`7672842`](sapphi-red/vite-plugin-static-copy@7672842) Thanks [@​sapphi-red](https://github.com/sapphi-red)! - Add `name` property to the `rename` object form and allow rename functions to return a `RenameObject`. The `name` property replaces the file's basename (filename + extension), and can be combined with `stripBase` to both flatten directory structure and rename the file in one step. Rename functions can now return `{ name, stripBase }` objects instead of only strings, making it easier to declaratively control output paths from dynamic rename logic. ```js // node_modules/lib/dist/index.js → vendor/lib.js { src: 'node_modules/lib/dist/index.js', dest: 'vendor', rename: { name: 'lib.js', stripBase: true } } // src/pages/events/test.html → dist/events/index.html { src: 'src/pages/**/*.html', dest: 'dist/', rename: { stripBase: 2, name: 'index.html' } } ``` </details> --- - [ ] <!-- rebase-check -->If you want to rebase/retry this MR, check this box --- This MR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4xMjkuMCIsInVwZGF0ZWRJblZlciI6IjQzLjE0MS4zIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJkZXBlbmRlbmNpZXMiLCJyZW5vdmF0ZSJdfQ==--> See merge request swiss-armed-forces/cyber-command/cea/loom!480 Co-authored-by: Loom MR Pipeline Trigger <group_103951964_bot_9504bb8dead6d4e406ad817a607f24be@noreply.gitlab.com>
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Summary
Fixes #36101
When a component function has a destructured prop with a
NewExpressiondefault value (e.g.{ value = new Number() }), the React Compiler bails out during HIR construction when trying to lower the default value vialowerReorderableExpression. This causesvalidateNoSetStateInEffectsto never run, silently suppressing theset-state-in-effectdiagnostic.Root cause:
isReorderableExpressiondid not have a case forNewExpression, so it fell through to thedefault: return falsebranch.lowerReorderableExpressionthen recorded aTodoerror and aborted compilation of the function before any validation passes ran.Fix: Add a
NewExpressioncase toisReorderableExpressionthat mirrors the existingCallExpressioncase — the expression is safe to reorder when the callee and all arguments are themselves reorderable (e.g. global identifiers and literals).How did you test this change?
Added a new compiler fixture
invalid-setState-in-useEffect-new-expression-default-paramthat reproduces the bug from the issue. The fixture verifies that theEffectSetStatediagnostic is correctly emitted for a component with aNewExpressiondefault prop value.All 1720 compiler snapshot tests pass.