Sync with react.dev @ f9e2c139

next.config.js

@@ -36,6 +36,14 @@ const nextConfig = {
     // Don't bundle the shim unnecessarily.
     config.resolve.alias['use-sync-external-store/shim'] = 'react';
 
+    // ESLint depends on the CommonJS version of esquery,
+    // but Webpack loads the ESM version by default. This
+    // alias ensures the correct version is used.
+    //
+    // More info:
+    // https://github.com/reactjs/react.dev/pull/8115
+    config.resolve.alias['esquery'] = 'esquery/dist/esquery.min.js';
+
     const {IgnorePlugin, NormalModuleReplacementPlugin} = require('webpack');
     config.plugins.push(
       new NormalModuleReplacementPlugin(

src/components/MDX/Sandpack/runESLint.tsx

@@ -21,13 +21,6 @@ const getCodeMirrorPosition = (
 
 const linter = new Linter();
 
-// HACK! Eslint requires 'esquery' using `require`, but there's no commonjs interop.
-// because of this it tries to run `esquery.parse()`, while there's only `esquery.default.parse()`.
-// This hack places the functions in the right place.
-const esquery = require('esquery');
-esquery.parse = esquery.default?.parse;
-esquery.matches = esquery.default?.matches;
-
 const reactRules = require('eslint-plugin-react-hooks').rules;
 linter.defineRules({
   'react-hooks/rules-of-hooks': reactRules['rules-of-hooks'],

src/content/reference/react/Component.md

@@ -1271,6 +1271,16 @@ We recommend defining components as functions instead of classes. [See how to mi
 
 By default, if your application throws an error during rendering, React will remove its UI from the screen. To prevent this, you can wrap a part of your UI into an *Error Boundary*. An Error Boundary is a special component that lets you display some fallback UI instead of the part that crashed--for example, an error message.
 
+<Note>
+Error boundaries do not catch errors for:
+
+- Event handlers [(learn more)](/learn/responding-to-events)
+- [Server side rendering](/reference/react-dom/server) 
+- Errors thrown in the error boundary itself (rather than its children)
+- Asynchronous code (e.g. `setTimeout` or `requestAnimationFrame` callbacks); an exception is the usage of the [`startTransition`](/reference/react/useTransition#starttransition) function returned by the [`useTransition`](/reference/react/useTransition) Hook. Errors thrown inside the transition function are caught by error boundaries [(learn more)](/reference/react/useTransition#displaying-an-error-to-users-with-error-boundary)
+
+</Note>
+
 To implement an Error Boundary component, you need to provide [`static getDerivedStateFromError`](#static-getderivedstatefromerror) which lets you update state in response to an error and display an error message to the user. You can also optionally implement [`componentDidCatch`](#componentdidcatch) to add some extra logic, for example, to log the error to an analytics service.
 
 With [`captureOwnerStack`](/reference/react/captureOwnerStack) you can include the Owner Stack during development.

src/sidebarBlog.json

@@ -32,6 +32,13 @@
           "date": "October 7, 2025",
           "path": "/blog/2025/10/07/introducing-the-react-foundation"
         },
+        {
+          "title": "React 19.2",
+          "titleForHomepage": "React 19.2",
+          "icon": "blog",
+          "date": "October 1, 2025",
+          "path": "/blog/2025/10/01/react-19-2"
+        },
         {
           "title": "React Labs: View Transitions, Activity, and more",
           "titleForHomepage": "View Transitions and Activity",