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More over, even after we remove them, the `style` attribute has now been normalized which we are unable t... | null | {
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- [ ] eslint-plugin-react-hooks (build issue installing or using the eslint plugin)
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Thanks for submitting a pull request!
We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory.
Before submitting a pull request, please make sure the following is done:
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Please provide a clear and concise description of what the bug is. Include
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When calling `setState` from inside `React.useEffect`, as opposed to directly `useEffe... | null | {
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} | ## Summary
This change improves cyclic thenable detection in `ReactFlightReplyServer` by tracking visited `ReactPromise` instances during traversal.
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<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/modelcontextprotocol/typescript-sdk/releases"><code>@modelcontextprotocol/sdk</code>'s releases</a>.</em></p>
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<summary>Release notes</summary>
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<h2>v3.2.3</h2>
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} | ## Summary
Upgrade GitHub Actions to their latest versions to ensure compatibility with Node 24, as Node 20 will reach end-of-life in April 2026.
## Changes
| Action | Old Version(s) | New Version | Release | Files |
|--------|---------------|-------------|---------|-------|
| `actions/cache` | [`v4`](https://github... | null | {
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} | ## Summary
Considering that effects are only appended (the list of effects is never mutated in the middle), `Array` seems like a better fit because it has a better cache locality, and it creates less memory allocations so there's less pressure on the GC.
## How did you test this change?
I have tested various b... | null | {
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} | ## Summary
This PR improves cyclic thenable detection in `ReactFlightReplyServer.js`. Fixes #35368.
The previous fix only detected direct self-references (`inspectedValue === chunk`) and relied on the `cycleProtection` counter to eventually bail out of longer cycles. This change keeps the existing MAX_THENABLE_CYCL... | null | {
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"happy to work on a fix for this and open a PR that adds proper multi-node\ncycle detection (using a visited set) while keeping the existing $1000$\n`cycleProtection` cap. I’ll send a PR shortly.",
"Opened a PR for this: #35369"
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19.0.3
## Steps To Reproduce
1. In `ReactFlightReplyServer.js`, construct a chain of `ReactPromise` instances where each `.value` points to the next, and the last one points back to the first (e.g. `A -> B -> C -> A`), creating a multi‑node cycle.
2. Trigger the cycle detection logic by resolving a chu... | null | {
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} | ## Summary
This PR addresses an issue where the `'use no memo'` directive does not apply recursively to nested functions.
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Summary:
Experimenting with this a bit. Not a serious change yet
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35364).
* __->__ #35364
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Added the repo root behind a global `__REACT_ROOT_PATH_TEST__` since that's used in a couple of places. Defining that for each test makes it annoying to move test file around. | {
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npx react-devtools
### Repro steps
I just run `npx react-devtools`, it recognise my app because does not appear the first page about how to connect it, but I always receive this error even have already checked my FlatList components (I am running React Native Expo development build). And if I clos... | null | {
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} | ## Summary
Fixes controlled checkboxes and radio buttons incorrectly resetting after form submission with form actions.
## Fixes
Fixes #31695
## The Bug
When a form with a function `action` is submitted, controlled checkboxes and radio buttons (those with a `checked` prop) are incorrectly reset to their defaul... | null | {
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Annotations like `// @reactVersion >= 16.9` were not being handled properly by the jest preprocessor on a Windows computer. This resulted in tests running that should have been skipped.
The root cause was that the relevant regular expressions in `preprocessor.js` were not matching the backslashes in W... | null | {
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Thanks for submitting a pull request!
We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory.
Before submitting a pull request, please make sure the following is done:
1. Fork ... | {
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Fixes #35355
The React Compiler was not properly memoizing values when a `const` declaration appeared between React hooks. This fix ensures that const declarations don't break the memoization analysis chain.
## Problem
When a `const` declaration appears between React hooks, the compiler's memoizatio... | {
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- [x] React Compiler core (the JS output is incorrect, or your app works incorrectly after optimization)
- [ ] babel-plugin-react-compiler (build issue installing or using the Babel plugin)
- [ ] eslint-plugin-react-hooks (build issue installing or using the eslint plugin)
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Reverted in https://github.com/facebook/react/pull/35346 after breaking main before security patch
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"More information in [Denial of Service and Source Code Exposure in React Server Components](https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components).\r\n\r\nThis vulnerability was disclosed as [CVE-2025-55183](https://www.cve.org/CVERecord?id=CVE-2025-55183) and [CVE... | 2025-12-11T20:18:07 | 2025-12-11T20:24:24 | 2025-12-11T20:24:24 | COLLABORATOR | null | null | false | {
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} | Server Functions can be stringified (sometimes implicitly) when passed as data. This adds an override to hide the source code in that case - just in case someone puts sensitive information in there.
Note that this still preserves the `name` field but this is also available on the export but in practice is likely min... | {
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"Hi @kingoncloud69! \n\nThank you for your pull request and welcome to our community. \n\n# Action Required\n\nIn order to merge **any pull request** (code, docs, etc.), we **require** contributors to sign our **Contributor License Agreement**, and we don't seem to have one on file for you.\n\n# Process\n\nIn order... | 2025-12-11T15:53:45 | 2025-12-13T10:50:50 | 2025-12-13T10:50:50 | NONE | null | null | false | {
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Thanks for submitting a pull request!
We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory.
Before submitting a pull request, please make sure the following is done:
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We can get `ReferenceError` if this is unavailable. Using `typeof` check instead for safety. | {
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- [x] React Compiler core (the JS output is incorrect, or your app works incorrectly after optimization)
- [x] babel-plugin-react-compiler (build issue installing or using the Babel plugin)
- [ ] eslint-plugin-react-hooks (build issue installing or using the eslint plugin)
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} | Continue attaching `internalInstanceKey` to DOM nodes in DEV. This prevents breaking some internal dev tooling while we experiment with the broader change. Note that this does not reference the DOM handle within the flag, just attaches it and deletes it. Internals tracking is still done through the private map.
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"I also tried to find out that you are getting this error because:\n\n**Your context file is a client component (`'use client'`)**, so a Server Component (`page.tsx`) **cannot render it directly**.\n\n**Correct code:**\n```jsx\n// context.tsx\n\"use client\";\nimport { createContext } from \"react\";\n\nexport cons... | 2025-12-09T21:46:08 | 2025-12-10T14:01:19 | null | CONTRIBUTOR | null | null | null | null | A Server Component that renders `<Context>` directly will result in a runtime error:
> Element type is invalid. Received a promise that resolves to: Context. Lazy element type must resolve to a class or function.
[Here's the minimum repro](https://github.com/samselikoff/2025-12-09-render-context-from-rsc):
```tsx
im... | null | {
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Temporarily enables these 2 flags for internal testing.
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} | Speculative fix to https://github.com/facebook/react/issues/35336 written by Claude.
I have verified that applying a similar patch locally to the repro from #35336 does fix the crash.
I'm not familiar enough with the underlying APIs to tell whether the fix is correct or sufficient. | {
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"Here's what Claude had to say about the root cause based on a crash dump from my phone and looking at React and Webkit source.\n\nCrash dump: \n[com.apple.WebKit.WebContent-2025-12-09-203451.log](https://github.com/user-attachments/files/24055100/com.apple.WebKit.WebContent-2025-12-09-203451.log)\n\nStack trace:\n... | 2025-12-09T12:25:51 | 2025-12-17T03:47:25 | 2025-12-17T03:47:25 | COLLABORATOR | null | null | null | null | I'm experiencing an iOS-only crash (iOS 26.1) when there's `ViewTransition` with `enter` and another with `exit`:
```js
import { Suspense, use } from "react";
import { ViewTransition } from "react";
import "./App.css";
const promise = new Promise((r) => setTimeout(() => r("Done"), 3000));
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"Hi @karankumbhare90! \n\nThank you for your pull request and welcome to our community. \n\n# Action Required\n\nIn order to merge **any pull request** (code, docs, etc.), we **require** contributors to sign our **Contributor License Agreement**, and we don't seem to have one on file for you.\n\n# Process\n\nIn ord... | 2025-12-09T08:42:18 | 2025-12-10T00:01:03 | 2025-12-10T00:01:02 | NONE | null | null | false | {
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- Reproduced a false-positive where destructuring a hook-named identifier from an object and then calling it is flagged:
const { useValue } = hooks;
useValue(); // should be allowed
- Root cause: The compiler treated hook-like names as values too eagerly without confirming how the binding is used.
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Updates flow-typed definitions and adds suppressions for regressions
in the updated type definitions:
- TextDecoder: constructor options should be optional
- TextEncoder: missing encodeInto method
- ReadableStreamDefaultReader: cancel() returns Promise<void>
- Animation types: missing optional properties
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Flow 0.288 removed several React$ built-in types (React$Context,
React$ElementProps, React$ElementRef, React$RefSetter). Added
$FlowFixMe[cannot-resolve-name] suppressions to preserve type exports.
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Flow 0.286 introduced stricter constant-condition detection that flags build-time feature flags (supportsMutation, supportsHydration, isPrimaryRenderer, enableProfiling, etc.) and narrowed null checks. Added inline $FlowFixMe suppressions to preserve existing runtime behavior.
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Add suppression for React\$Element incompatibility with ReactNodeList in
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Major changes in Flow 0.281:
- $FlowFixMe comments now require explicit error codes (e.g., $FlowFixMe[incompatible-type])
- Changed all bare $FlowFixMe to include appropriate error codes
- Changed $FlowIgnore to $FlowFixMe where needed
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This PR adds regression tests that demonstrate the issue with UpdateExpression on captured variables.
- `todo-update-expression-captured-variable.js`: Fails with Todo error
- `todo-post-increment-assignment.js`: Produces incorrect output
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React version:
## Steps To Reproduce
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Please provide a clear and concise description of what the bug is. Include
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React version: react 19.1.2 / next 15.3.6
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} | ## Summary
Fixes https://github.com/vitejs/vite-plugin-react/issues/1006
I'm not sure a lot of users do nest hooks at the second level, but the added complexity to the Babel plugin fells low enough to add support to it.
Before this change, the signature for the test would have been `_s(App, "useNestedThing{foo... | null | {
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"> However, Activity never ended up being used due to incompatibilities with Monaco Editor\r\n\r\nYou might be referring to [this issue](https://github.com/suren-atoyan/monaco-react/issues/753) which has been fixed. The fix cleared the way for Activity in [this PR](https://github.com/facebook/react/pull/34958), now... | 2025-12-07T13:51:11 | 2025-12-08T19:06:58 | 2025-12-08T19:06:58 | COLLABORATOR | null | null | false | {
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} | Was bumped to a canary in https://github.com/facebook/react/pull/34499/ which got never released as stable.
Presumeably to use `Activity` which only made it into Activity in later Next.js releases. However, `Activity` never ended up being used due to incompatibilities with Monaco Editor. Downgrading should be safe.
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Others were including an irrelevant stack frame making it harder to review diffs. I suspect most of the variation was caused by our JSX transform not sourcemapping perfectly. | {
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"Closing for the same reason as https://github.com/facebook/react/pull/35310#issuecomment-3621060056 since this PR is a near duplicate"
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} | This PR delivers two important correctness fixes in React.
The first resolves a false negative in the set-state-in-use-effect ESLint rule, and the second ensures forms no longer reset when an action fails. Both issues affected reliability and developer experience.
1. Fix: set-state-in-use-effect false negative (#35... | {
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} | Description
This PR fixes a false negative in the set-state-in-use-effect ESLint rule where setState calls inside effect callbacks were not reported when a component contained multiple useState and useEffect hooks.
Problem Summary
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} | ## Security Fix
This PR addresses a **HIGH** severity vulnerability detected by our security scanner.
### Security Impact Assessment
| Aspect | Rating | Rationale |
|--------|--------|-----------|
| Impact | Medium | In the context of the React repository, this vulnerability is in fixture code for a demo app, not th... | {
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Please provide a clear and concise description of what the bug is. Include
screenshots if needed. Please test using the latest version of the relevant
React packages to make sure your issue has not already been fixed.
-->
React version:
## Steps To Reproduce
1.
2.
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"Hi @tennisleng! \n\nThank you for your pull request and welcome to our community. \n\n# Action Required\n\nIn order to merge **any pull request** (code, docs, etc.), we **require** contributors to sign our **Contributor License Agreement**, and we don't seem to have one on file for you.\n\n# Process\n\nIn order fo... | 2025-12-05T21:09:53 | 2025-12-11T19:00:51 | null | NONE | null | null | false | {
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"I think you might need to add this to runtime_build_and_test.yml, right at the top:\r\n\r\n```yml\r\nenv:\r\n JAVA_HOME: ${{ env.JAVA_HOME_21_X64 }}\r\n```",
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The `validateNoSetStateInEffects` validator missed `setState` calls inside effects when `useState` was declared **after** the first `useEffect`.
This change adds a second pass over lowered function expressions (effect callbacks) to collect all setters, fixing the false negative with **zero runtime c... | {
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We currently model impure functions like `Date.now()` with an `Impure` effect, but the way this works is that the effect is considered an error if it's called at all. But we really want to reflect the fact that the _value_ is impure, and is okay to be used outside of render. For example, `useRef(Date.now())` should be... | null | {
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"Hi @yujiteshima! \n\nThank you for your pull request and welcome to our community. \n\n# Action Required\n\nIn order to merge **any pull request** (code, docs, etc.), we **require** contributors to sign our **Contributor License Agreement**, and we don't seem to have one on file for you.\n\n# Process\n\nIn order f... | 2025-12-05T15:31:19 | 2025-12-14T04:34:31 | null | NONE | null | null | false | {
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} | ## Summary
Fix typos in comments within the react-reconciler package:
reconcilation → reconciliation
passsed → passed
muliple → multiple
commmit → commit
deletiong → deletion
becuase → because
udpates → updates
## How did you test this change?
This change only fixes typos in code comments. No functional... | null | {
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} | Follow-up to https://github.com/facebook/react/pull/34641.
Similar to https://github.com/facebook/react/pull/35293, https://github.com/facebook/react/pull/35294.
React DevTools backend can be used in non-DOM environments, so we have to feature-check some DOM APIs.
For now I am just no-oping newly added commands fo... | {
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Please provide a clear and concise description of what the bug is. Include
screenshots if needed. Please test using the latest version of the relevant
React packages to make sure your issue has not already been fixed.
-->
React version: 19.2.1
## Steps To Reproduce
1. Enter some text into the input and su... | null | {
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} | Follow-up to https://github.com/facebook/react/pull/34653.
React Native doesn't implement `getClientRect`, since this is applicable to CSS box, which is not a concept for Native (maybe yet).
I am loosening the condition that gates `showOverlay()` call to pass if `getClientRect` is not implemented.
Conceptually... | {
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} | `Error.prepareStackTrace` is non-standard feature and not all JavaScript runtimes implement the methods that we are using in React DevTools backend.
This PR adds additional checks for the presence of the methods that we are using. | {
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"I'm not sure why the Vercel workflow is failing, I've clicked on it to authorise but nothing seems to happen.",
"@eps1lon May I get a reason/explanation why this was closed?",
"Sorry, the code hasn't been used for the longest time and I assumed this is AI slop 😬 We'll be removing it instead.",
"> I assumed ... | 2025-12-05T02:17:50 | 2025-12-06T01:44:17 | 2025-12-06T01:00:32 | NONE | null | null | false | {
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} | ## Summary
Several of the C++ source files have inconsistent styles (such as varying alignment for pointer asterisks). This PR aims to eliminate the differences so that the code base is more consistent.
This also adds the `[[nodiscard]]` attribute to several methods in the code base, especially those which return a... | {
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"The example you provided does [correctly error in compiler playground](https://playground.react.dev/#N4Igzg9grgTgxgUxALhAMygOzgFwJYSYAEAsgJ4DCEAtgA6EKY4AUAlEcADrFG9yFgcRANoAbCAEMAJnkwBzADREwCHABlJM+QF0iAXiJQVAZRwScCZmgmiVrANzdevIwgCiaNAlzM2+gHwcTs4hKuqasnLMODBQCA68APSJRIAy5EQAQgCqAOLIRG4wMBAwRJgQROLyCKUwCPQwFlJEzG... | 2025-12-05T00:26:04 | 2025-12-16T08:21:35 | 2025-12-06T19:30:56 | NONE | null | null | null | null | This code correctly produces a lint error:
```tsx
function MyComponent() {
const [loading, setLoading] = useState(false);
useEffect(() => {
setLoading(true); // ✅ ESLint correctly flags this (1 error)
}, []);
// commented out code...
return null;
}
```
But this code does not:
```tsx
func... | {
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"\n<!--\n 0 failure: \n 0 warning: \n \n 1 markdown notices\n DangerID: danger-id-stable;\n-->\n\n\n\n\nComparing: 3016ff87d87aeff5181d95348d609039fdcad94a...4ea9664f336a1c37728a33d3dc04f34466da93a0\n\n## Critical size changes\n\nIncludes critical production bundles, as well as any change greater than 2%:\n\n\... | 2025-12-05T00:08:11 | 2025-12-05T02:59:25 | 2025-12-05T02:59:21 | COLLABORATOR | null | null | false | {
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} | The [proof of concept](https://qideng.substack.com/p/react2shell-rce-in-react-server-components) shared exploits using the "unbundled" version of the experimental `react-server-dom-webpack` package, which is used for non-production demos and currently has no known users. To our knowledge, it's not used by anyone in pro... | {
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This update modifies the constant propagation implementation to include a new function that collects JSX tag identifiers. The `applyConstantPropagation` function is updated to utilize these identifiers, improving the handling of local JSX tags during con... | null | {
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} | Alternative approach to #35282 for validating effect deps in the compiler that builds on the machinery in ValidateExhaustiveDependencies. Key changes to that pass:
* Refactor to track the dependencies of array expressions as temporaries so we can look them up later if they appear as effect deps.
* Instead of not st... | {
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This was super tricky to debug, for posterity the tri... | {
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"Please assign this issue to me. Thank You."
] | 2025-12-04T01:33:51 | 2025-12-04T19:20:38 | null | NONE | null | null | null | null | React version: 19.2.
## Steps To Reproduce
1. The expected behavior screenshot shows when my repo had eslint-plugin-react-compiler@beta and eslint-plugin-react-hooks@4.6.2 installed. [Per the React Compiler v1.0 announcement](https://react.dev/blog/2025/10/07/react-compiler-1#migrating-from-eslint-plugin-react-compil... | null | {
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"Closing in favor of #35285 "
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} | This PR adds a new validator behind the `validateExtraneousEffectDependencies` config option, default `false`. This is an experimental error log to flag the over-inclusion of values in the effect dep array that are not used by the effect.
This is implemented as a React Compiler Validator for now rather than as part ... | {
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} | ### Summary
Improves the developer warning message shown when legacy context is used inside a StrictMode tree.
### Changes
- Shortened and clarified the warning message.
- Added a clear migration instruction.
- Reformatted the output for better readability.
### Why?
Clear warnings improve developer experienc... | null | {
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"## Additional E2E verification\r\n\r\n1. Built local eslint-plugin-react-hooks package.\r\n2. Installed in a test project.\r\n3. Ran ESLint and confirmed both useEffect and React.useEffect now report the `set-state-in-effect` error.\r\n\r\nReviewers can also verify via this [CodeSandbox](https://codesandbox.io/p/g... | 2025-12-03T17:13:13 | 2025-12-15T08:34:16 | null | NONE | null | null | false | {
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} | ## Summary
I noticed that `React.useEffect` bypasses the `set-state-in-effect` validation, as shown below.
```js
// ✅ ESLint error reported (refer to: react-hooks/set-state-in-effect)
useEffect(() => setState(s => s + 1), []);
// ❌ No ESLint error, but it should have
React.useEffect(() => setState(s => s + ... | null | {
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"Hi @more-shubham! \n\nThank you for your pull request and welcome to our community. \n\n# Action Required\n\nIn order to merge **any pull request** (code, docs, etc.), we **require** contributors to sign our **Contributor License Agreement**, and we don't seem to have one on file for you.\n\n# Process\n\nIn order ... | 2025-12-03T16:46:22 | 2025-12-06T15:39:27 | null | NONE | null | null | false | {
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} | ## Summary
Fixes #24283
- Adds a `__REACT_DEVTOOLS_HIDE_CONSOLE__` global variable that suppresses the "Download the React DevTools" console message
- Useful for remote debugging environments (CEP, nwjs-like contexts) where the Chrome extension cannot function
- Includes Flow type declaration and test coverage
## Te... | null | {
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} | FlightReplyServer are for client->server and ReactFlightClient is for server->client. They're not 100% symmetrical.
We did a number of refactors to ReactFlightClient in PRs like #29823 and #33664 to change the structure of the resolution. This PR brings those changes to synchronize the two approaches. Which addresse... | {
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