reactjs · react-translations-bot · Mar 21, 2025 · Mar 21, 2025 · Mar 24, 2025 · Mar 24, 2025
diff --git a/.github/workflows/analyze.yml b/.github/workflows/analyze.yml
@@ -7,6 +7,8 @@ on:
       - main # change this if your default branch is named differently
   workflow_dispatch:
 
+permissions: {}
+
 jobs:
   analyze:
     runs-on: ubuntu-latest
@@ -23,7 +25,7 @@ jobs:
       - name: Restore cached node_modules
         uses: actions/cache@v4
         with:
-          path: "**/node_modules"
+          path: '**/node_modules'
           key: node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
 
       - name: Install deps
@@ -55,7 +57,7 @@ jobs:
           name: bundle_analysis.json
 
       - name: Download base branch bundle stats
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@268677152d06ba59fcec7a7f0b5d961b6ccd7e1e
         if: success() && github.event.number
         with:
           workflow: analyze.yml

diff --git a/.github/workflows/analyze_comment.yml b/.github/workflows/analyze_comment.yml
@@ -2,10 +2,12 @@ name: Analyze Bundle (Comment)
 
 on:
   workflow_run:
-    workflows: ["Analyze Bundle"]
+    workflows: ['Analyze Bundle']
     types:
       - completed
 
+permissions: {}
+
 jobs:
   comment:
     runs-on: ubuntu-latest
@@ -14,15 +16,15 @@ jobs:
       github.event.workflow_run.conclusion == 'success' }}
     steps:
       - name: Download base branch bundle stats
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@268677152d06ba59fcec7a7f0b5d961b6ccd7e1e
         with:
           workflow: analyze.yml
           run_id: ${{ github.event.workflow_run.id }}
           name: analysis_comment.txt
           path: analysis_comment.txt
 
       - name: Download PR number
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@268677152d06ba59fcec7a7f0b5d961b6ccd7e1e
         with:
           workflow: analyze.yml
           run_id: ${{ github.event.workflow_run.id }}
@@ -48,7 +50,7 @@ jobs:
           echo "pr-number=$pr_number" >> $GITHUB_OUTPUT
 
       - name: Comment
-        uses: marocchino/sticky-pull-request-comment@v2
+        uses: marocchino/sticky-pull-request-comment@52423e01640425a022ef5fd42c6fb5f633a02728
         with:
           header: next-bundle-analysis
           number: ${{ steps.get-comment-body.outputs.pr-number }}

diff --git a/.github/workflows/discord_notify.yml b/.github/workflows/discord_notify.yml
@@ -4,12 +4,16 @@ on:
   pull_request_target:
     types: [opened, ready_for_review]
 
+permissions: {}
+
 jobs:
   check_maintainer:
     uses: facebook/react/.github/workflows/shared_check_maintainer.yml@main
+    permissions:
+      # Used by check_maintainer
+      contents: read
     with:
       actor: ${{ github.event.pull_request.user.login }}
-      is_remote: true
 
   notify:
     if: ${{ needs.check_maintainer.outputs.is_core_team == 'true' }}

diff --git a/.github/workflows/label_core_team_prs.yml b/.github/workflows/label_core_team_prs.yml
@@ -3,6 +3,8 @@ name: Label Core Team PRs
 on:
   pull_request_target:
 
+permissions: {}
+
 env:
   TZ: /usr/share/zoneinfo/America/Los_Angeles
   # https://github.com/actions/cache/blob/main/tips-and-workarounds.md#cache-segment-restore-timeout
@@ -11,14 +13,21 @@ env:
 jobs:
   check_maintainer:
     uses: facebook/react/.github/workflows/shared_check_maintainer.yml@main
+    permissions:
+      # Used by check_maintainer
+      contents: read
     with:
       actor: ${{ github.event.pull_request.user.login }}
-      is_remote: true
 
   label:
     if: ${{ needs.check_maintainer.outputs.is_core_team == 'true' }}
     runs-on: ubuntu-latest
     needs: check_maintainer
+    permissions:
+      # Used to add labels on issues
+      issues: write
+      # Used to add labels on PRs
+      pull-requests: write
     steps:
       - name: Label PR as React Core Team
         uses: actions/github-script@v7

diff --git a/.github/workflows/site_lint.yml b/.github/workflows/site_lint.yml
@@ -7,6 +7,8 @@ on:
   pull_request:
     types: [opened, synchronize, reopened]
 
+permissions: {}
+
 jobs:
   lint:
     runs-on: ubuntu-latest
@@ -25,7 +27,7 @@ jobs:
       - name: Restore cached node_modules
         uses: actions/cache@v4
         with:
-          path: "**/node_modules"
+          path: '**/node_modules'
           key: node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }}
 
       - name: Install deps

diff --git a/postcss.config.js b/postcss.config.js
@@ -17,4 +17,4 @@ module.exports = {
       },
     },
   },
-}
+};
diff --git a/public/js/jsfiddle-integration-babel.js b/public/js/jsfiddle-integration-babel.js
@@ -4,12 +4,14 @@
 
 // Do not delete or move this file.
 // Many fiddles reference it so we have to keep it here.
-(function() {
+(function () {
   var tag = document.querySelector(
     'script[type="application/javascript;version=1.7"]'
   );
   if (!tag || tag.textContent.indexOf('window.onload=function(){') !== -1) {
-    alert('Bad JSFiddle configuration, please fork the original React JSFiddle');
+    alert(
+      'Bad JSFiddle configuration, please fork the original React JSFiddle'
+    );
   }
   tag.setAttribute('type', 'text/babel');
   tag.textContent = tag.textContent.replace(/^\/\/<!\[CDATA\[/, '');

diff --git a/public/js/jsfiddle-integration.js b/public/js/jsfiddle-integration.js
@@ -4,12 +4,14 @@
 
 // Do not delete or move this file.
 // Many fiddles reference it so we have to keep it here.
-(function() {
+(function () {
   var tag = document.querySelector(
     'script[type="application/javascript;version=1.7"]'
   );
   if (!tag || tag.textContent.indexOf('window.onload=function(){') !== -1) {
-    alert('Bad JSFiddle configuration, please fork the original React JSFiddle');
+    alert(
+      'Bad JSFiddle configuration, please fork the original React JSFiddle'
+    );
   }
   tag.setAttribute('type', 'text/jsx;harmony=true');
   tag.textContent = tag.textContent.replace(/^\/\/<!\[CDATA\[/, '');

diff --git a/scripts/headingIDHelpers/walk.js b/scripts/headingIDHelpers/walk.js
@@ -2,10 +2,10 @@ const fs = require('fs');
 
 module.exports = function walk(dir) {
   let results = [];
-  /** 
+  /**
    * If the param is a directory we can return the file
    */
-  if(dir.includes('md')){
+  if (dir.includes('md')) {
     return [dir];
   }
   const list = fs.readdirSync(dir);

diff --git a/scripts/headingIdLinter.js b/scripts/headingIdLinter.js
@@ -1,12 +1,12 @@
 const validateHeaderIds = require('./headingIDHelpers/validateHeadingIDs');
 const generateHeadingIds = require('./headingIDHelpers/generateHeadingIDs');
 
-/** 
+/**
  * yarn lint-heading-ids --> Checks all files and causes an error if heading ID is missing
  * yarn lint-heading-ids --fix --> Fixes all markdown file's heading IDs
  * yarn lint-heading-ids path/to/markdown.md --> Checks that particular file for missing heading ID (path can denote a directory or particular file)
  * yarn lint-heading-ids --fix path/to/markdown.md --> Fixes that particular file's markdown IDs (path can denote a directory or particular file)
-*/
+ */
 
 const markdownPaths = process.argv.slice(2);
 if (markdownPaths.includes('--fix')) {

diff --git a/src/components/Layout/Page.tsx b/src/components/Layout/Page.tsx
@@ -8,7 +8,7 @@ import {useRouter} from 'next/router';
 import {SidebarNav} from './SidebarNav';
 import {Footer} from './Footer';
 import {Toc} from './Toc';
-// import SocialBanner from '../SocialBanner';
+import SocialBanner from '../SocialBanner';
 import {DocsPageFooter} from 'components/DocsFooter';
 import {Seo} from 'components/Seo';
 import PageHeading from 'components/PageHeading';
@@ -137,7 +137,7 @@ export function Page({
           />
         </Head>
       )}
-      {/*<SocialBanner />*/}
+      <SocialBanner />
       <TopNav
         section={section}
         routeTree={routeTree}

diff --git a/src/components/MDX/ErrorDecoder.tsx b/src/components/MDX/ErrorDecoder.tsx
@@ -69,7 +69,7 @@ function parseQueryString(search: string): Array<string | undefined> {
 }
 
 export default function ErrorDecoder() {
-  const {errorMessage} = useErrorDecoderParams();
+  const {errorMessage, errorCode} = useErrorDecoderParams();
   /** error messages that contain %s require reading location.search */
   const hasParams = errorMessage?.includes('%s');
   const [message, setMessage] = useState<React.ReactNode | null>(() =>
@@ -82,23 +82,28 @@ export default function ErrorDecoder() {
     if (errorMessage == null || !hasParams) {
       return;
     }
+    const args = parseQueryString(window.location.search);
+    let message = errorMessage;
+    if (errorCode === '418') {
+      // Hydration errors have a %s for the diff, but we don't add that to the args for security reasons.
+      message = message.replace(/%s$/, '');
 
-    setMessage(
-      urlify(
-        replaceArgs(
-          errorMessage,
-          parseQueryString(window.location.search),
-          '[missing argument]'
-        )
-      )
-    );
+      // Before React 19.1, the error message didn't have an arg, and was always HTML.
+      if (args.length === 0) {
+        args.push('HTML');
+      } else if (args.length === 1 && args[0] === '') {
+        args[0] = 'HTML';
+      }
+    }
+
+    setMessage(urlify(replaceArgs(message, args, '[missing argument]')));
     setIsReady(true);
-  }, [hasParams, errorMessage]);
+  }, [errorCode, hasParams, errorMessage]);
 
   return (
     <code
       className={cn(
-        'block bg-red-100 text-red-600 py-4 px-6 mt-5 rounded-lg',
+        'whitespace-pre-line block bg-red-100 text-red-600 py-4 px-6 mt-5 rounded-lg',
         isReady ? 'opacity-100' : 'opacity-0'
       )}>
       <b>{message}</b>

diff --git a/src/components/MDX/Sandpack/template.ts b/src/components/MDX/Sandpack/template.ts
@@ -28,8 +28,8 @@ root.render(
           eject: 'react-scripts eject',
         },
         dependencies: {
-          react: '19.0.0-rc-3edc000d-20240926',
-          'react-dom': '19.0.0-rc-3edc000d-20240926',
+          react: '^19.1.0',
+          'react-dom': '^19.1.0',
           'react-scripts': '^5.0.0',
         },
       },

diff --git a/src/components/SocialBanner.tsx b/src/components/SocialBanner.tsx
@@ -7,7 +7,7 @@ import {useRef, useEffect} from 'react';
 import cn from 'classnames';
 import {ExternalLink} from './ExternalLink';
 
-const bannerText = 'Stream React Conf on May 15-16.';
+const bannerText = 'Join us for React Conf on Oct 7-8.';
 const bannerLink = 'https://conf.react.dev/';
 const bannerLinkText = 'Learn more.';
 

diff --git a/src/content/community/conferences.md b/src/content/community/conferences.md
@@ -10,16 +10,6 @@ Do you know of a local React.js conference? Add it here! (Please keep the list c
 
 ## Upcoming Conferences {/*upcoming-conferences*/}
 
-### React Paris 2025 {/*react-paris-2025*/}
-March 20 - 21, 2025. In-person in Paris, France (hybrid event)
-
-[Website](https://react.paris/) - [Twitter](https://x.com/BeJS_)
-
-### React Native Connection 2025 {/*react-native-connection-2025*/}
-April 3 (Reanimated Training) + April 4 (Conference), 2025. Paris, France.
-
-[Website](https://reactnativeconnection.io/) - [X](https://x.com/reactnativeconn) - [Bluesky](https://bsky.app/profile/reactnativeconnect.bsky.social)
-
 ### CityJS London 2025 {/*cityjs-london*/}
 April 23 - 25, 2025. In-person in London, UK 
 
@@ -50,6 +40,11 @@ September 2-4, 2025. Wrocław, Poland.
 
 [Website](https://www.reactuniverseconf.com/) - [Twitter](https://twitter.com/react_native_eu) - [LinkedIn](https://www.linkedin.com/events/reactuniverseconf7163919537074118657/)
 
+### React Conf 2025 {/*react-conf-2025*/}
+October 7-8, 2025. Henderson, Nevada, USA and free livestream
+
+[Website](https://conf.react.dev/) - [Twitter](https://x.com/reactjs) - [Bluesky](https://bsky.app/profile/react.dev)
+
 ### React India 2025 {/*react-india-2025*/}
 October 31 - November 01, 2025. In-person in Goa, India (hybrid event) + Oct 15 2025 - remote day
 
@@ -58,6 +53,16 @@ October 31 - November 01, 2025. In-person in Goa, India (hybrid event) + Oct 15
 
 ## Past Conferences {/*past-conferences*/}
 
+### React Paris 2025 {/*react-paris-2025*/}
+March 20 - 21, 2025. In-person in Paris, France (hybrid event)
+
+[Website](https://react.paris/) - [Twitter](https://x.com/BeJS_)
+
+### React Native Connection 2025 {/*react-native-connection-2025*/}
+April 3 (Reanimated Training) + April 4 (Conference), 2025. Paris, France.
+
+[Website](https://reactnativeconnection.io/) - [X](https://x.com/reactnativeconn) - [Bluesky](https://bsky.app/profile/reactnativeconnect.bsky.social)
+
 ### React Day Berlin 2024 {/*react-day-berlin-2024*/}
 December 13 & 16, 2024. In-person in Berlin, Germany + remote (hybrid event)
 

diff --git a/src/content/community/meetups.md b/src/content/community/meetups.md
@@ -47,6 +47,9 @@ Yerli React.js yığıncağınız (meetup) varsa, buraya əlavə edin! (Xahiş e
 ## Colombia {/*colombia*/}
 * [Medellin](https://www.meetup.com/React-Medellin/)
 
+## Czechia {/*czechia*/}
+* [Prague](https://guild.host/react-prague/)
+
 ## Denmark {/*denmark*/}
 * [Aalborg](https://www.meetup.com/Aalborg-React-React-Native-Meetup/)
 * [Aarhus](https://www.meetup.com/Aarhus-ReactJS-Meetup/)
@@ -78,7 +81,7 @@ Yerli React.js yığıncağınız (meetup) varsa, buraya əlavə edin! (Xahiş e
 * [Thessaloniki](https://www.meetup.com/Thessaloniki-ReactJS-Meetup/)
 
 ## India {/*india*/}
-* [Ahmedabad](https://www.meetup.com/react-ahmedabad/)
+* [Ahmedabad](https://reactahmedabad.dev/)
 * [Bangalore (React)](https://www.meetup.com/ReactJS-Bangalore/)
 * [Bangalore (React Native)](https://www.meetup.com/React-Native-Bangalore-Meetup)
 * [Chennai](https://www.linkedin.com/company/chennaireact)
@@ -166,6 +169,7 @@ Yerli React.js yığıncağınız (meetup) varsa, buraya əlavə edin! (Xahiş e
 * [Cleveland, OH - ReactJS](https://www.meetup.com/Cleveland-React/)
 * [Columbus, OH - ReactJS](https://www.meetup.com/ReactJS-Columbus-meetup/)
 * [Dallas, TX - ReactJS](https://www.meetup.com/ReactDallas/)
+* [Denver, CO - React Denver](https://reactdenver.com/)
 * [Detroit, MI - Detroit React User Group](https://www.meetup.com/Detroit-React-User-Group/)
 * [Indianapolis, IN - React.Indy](https://www.meetup.com/React-Indy)
 * [Irvine, CA - ReactJS](https://www.meetup.com/ReactJS-OC/)

diff --git a/src/content/learn/build-a-react-app-from-scratch.md b/src/content/learn/build-a-react-app-from-scratch.md
@@ -65,7 +65,7 @@ Rsbuild includes built-in support for React features like fast refresh, JSX, Typ
 
 #### Metro for React Native {/*react-native*/}
 
-If you'd you're starting from scratch with React Native you'll need to use [Metro](https://metrobundler.dev/), the JavaScript bundler for React Native. Metro supports bundling for platforms like iOS and Android, but lacks many features when compared to the tools here. We recommend starting with Vite, Parcel, or Rsbuild unless your project requires React Native support.
+If you're starting from scratch with React Native you'll need to use [Metro](https://metrobundler.dev/), the JavaScript bundler for React Native. Metro supports bundling for platforms like iOS and Android, but lacks many features when compared to the tools here. We recommend starting with Vite, Parcel, or Rsbuild unless your project requires React Native support.
 
 </Note>
 
@@ -83,7 +83,7 @@ Routers are a core part of modern applications, and are usually integrated with
 
 We suggest using:
 
-- [React Router](https://reactrouter.com/start/framework/custom)
+- [React Router](https://reactrouter.com/start/data/custom)
 - [Tanstack Router](https://tanstack.com/router/latest)
 
 

diff --git a/src/content/learn/reusing-logic-with-custom-hooks.md b/src/content/learn/reusing-logic-with-custom-hooks.md
@@ -1333,7 +1333,7 @@ export function useOnlineStatus() {
 
 In the above example, `useOnlineStatus` is implemented with a pair of [`useState`](/reference/react/useState) and [`useEffect`.](/reference/react/useEffect) However, this isn't the best possible solution. There is a number of edge cases it doesn't consider. For example, it assumes that when the component mounts, `isOnline` is already `true`, but this may be wrong if the network already went offline. You can use the browser [`navigator.onLine`](https://developer.mozilla.org/en-US/docs/Web/API/Navigator/onLine) API to check for that, but using it directly would not work on the server for generating the initial HTML. In short, this code could be improved.
 
-Luckily, React 18 includes a dedicated API called [`useSyncExternalStore`](/reference/react/useSyncExternalStore) which takes care of all of these problems for you. Here is how your `useOnlineStatus` Hook, rewritten to take advantage of this new API:
+React includes a dedicated API called [`useSyncExternalStore`](/reference/react/useSyncExternalStore) which takes care of all of these problems for you. Here is your `useOnlineStatus` Hook, rewritten to take advantage of this new API:
 
 <Sandpack>
 

diff --git a/src/content/learn/tutorial-tic-tac-toe.md b/src/content/learn/tutorial-tic-tac-toe.md
@@ -2247,7 +2247,7 @@ body {
 
 </Sandpack>
 
-As you iterate through `history` array inside the function you passed to `map`, the `squares` argument goes through each element of `history`, and the `move` argument goes through each array index: `0`, `1`, `2`, …. (In most cases, you'd need the actual array elements, but to render a list of moves you will only need indexes.)
+As you iterate through the `history` array inside the function you passed to `map`, the `squares` argument goes through each element of `history`, and the `move` argument goes through each array index: `0`, `1`, `2`, …. (In most cases, you'd need the actual array elements, but to render a list of moves you will only need indexes.)
 
 For each move in the tic-tac-toe game's history, you create a list item `<li>` which contains a button `<button>`. The button has an `onClick` handler which calls a function called `jumpTo` (that you haven't implemented yet).
-Original file line number
+Diff line change
@@ @@ -17,4 +17,4 @@ module.exports = { @@
           },
         },
       },
-    }
+    };