Merge pull request #203 from reactjs/sync-d34c6a2c

Sync with react.dev @ d34c6a2

Author: nafistiham

public/images/tutorial/react-starter-code-codesandbox.png

@@ -30,7 +30,7 @@ export const DocsPageFooter = memo<DocsPageFooterProps>(
             <div className="grid grid-cols-1 gap-4 py-4 mx-auto max-w-7xl md:grid-cols-2 md:py-12">
               {prevRoute?.path ? (
                 <FooterLink
-                  type="পূর্ববর্তী পেইজ"
+                  type="Previous"
                   title={prevRoute.title}
                   href={prevRoute.path}
                 />
@@ -40,7 +40,7 @@ export const DocsPageFooter = memo<DocsPageFooterProps>(
 
               {nextRoute?.path ? (
                 <FooterLink
-                  type="পরবর্তী পেইজ"
+                  type="Next"
                   title={nextRoute.title}
                   href={nextRoute.path}
                 />
@@ -63,24 +63,24 @@ function FooterLink({
 }: {
   href: string;
   title: string;
-  type: 'পূর্ববর্তী পেইজ' | 'পরবর্তী পেইজ';
+  type: 'Previous' | 'Next';
 }) {
   return (
     <NextLink
       href={href}
       className={cn(
         'flex gap-x-4 md:gap-x-6 items-center w-full md:min-w-80 md:w-fit md:max-w-md px-4 md:px-5 py-6 border-2 border-transparent text-base leading-base text-link dark:text-link-dark rounded-lg group focus:text-link dark:focus:text-link-dark focus:bg-highlight focus:border-link dark:focus:bg-highlight-dark dark:focus:border-link-dark focus:border-opacity-100 focus:border-2 focus:ring-1 focus:ring-offset-4 focus:ring-blue-40 active:ring-0 active:ring-offset-0 hover:bg-gray-5 dark:hover:bg-gray-80',
         {
-          'flex-row-reverse justify-self-end text-end': type === 'পরবর্তী পেইজ',
+          'flex-row-reverse justify-self-end text-end': type === 'Next',
         }
       )}>
       <IconNavArrow
         className="inline text-tertiary dark:text-tertiary-dark group-focus:text-link dark:group-focus:text-link-dark"
-        displayDirection={type === 'পূর্ববর্তী পেইজ' ? 'start' : 'end'}
+        displayDirection={type === 'Previous' ? 'start' : 'end'}
       />
       <div className="flex flex-col overflow-hidden">
         <span className="text-sm font-bold tracking-wide no-underline uppercase text-secondary dark:text-secondary-dark group-focus:text-link dark:group-focus:text-link-dark group-focus:text-opacity-100">
-          {type}
+          {type === 'Previous' ? 'Previous' : 'Next'}
         </span>
         <span className="text-lg break-words group-hover:underline">
           {title}

src/components/DocsFooter.tsx

@@ -19,6 +19,7 @@ export const IconArrowSmall = memo<
   const classes = cn(className, {
     'rotate-180': displayDirection === 'left',
     'rotate-180 rtl:rotate-0': displayDirection === 'start',
+    'rtl:rotate-180': displayDirection === 'end',
     'rotate-90': displayDirection === 'down',
   });
   return (

src/components/Icon/IconArrowSmall.tsx

@@ -108,7 +108,7 @@ export function Navigation({
           onClick={handleScrollLeft}
           aria-label="Scroll left"
           className={cn(
-            'bg-secondary-button dark:bg-secondary-button-dark h-8 px-2 rounded-l border-gray-20 border-r rtl:rotate-180',
+            'bg-secondary-button dark:bg-secondary-button-dark h-8 px-2 rounded-l rtl:rounded-r rtl:rounded-l-none border-gray-20 border-r rtl:border-l rtl:border-r-0',
             {
               'text-primary dark:text-primary-dark': canScrollLeft,
               'text-gray-30': !canScrollLeft,
@@ -120,7 +120,7 @@ export function Navigation({
           onClick={handleScrollRight}
           aria-label="Scroll right"
           className={cn(
-            'bg-secondary-button dark:bg-secondary-button-dark h-8 px-2 rounded-e rtl:rotate-180',
+            'bg-secondary-button dark:bg-secondary-button-dark h-8 px-2 rounded-e',
             {
               'text-primary dark:text-primary-dark': canScrollRight,
               'text-gray-30': !canScrollRight,

src/components/MDX/Challenges/Navigation.tsx

@@ -2521,7 +2521,7 @@ export default function App() {
   const { url } = useRouter();
 
   // Define a default animation of .slow-fade.
-  // See animations.css for the animation definiton.
+  // See animations.css for the animation definition.
   return (
     <ViewTransition default="slow-fade">
       {url === '/' ? <Home /> : <Details />}

src/content/blog/2025/04/23/react-labs-view-transitions-activity-and-more.md

@@ -20,6 +20,11 @@ October 2-4, 2025. Alicante, Spain.
 
 [Website](https://reactalicante.es/) - [Twitter](https://x.com/ReactAlicante) - [Bluesky](https://bsky.app/profile/reactalicante.es) - [YouTube](https://www.youtube.com/channel/UCaSdUaITU1Cz6PvC97A7e0w)
 
+### RenderCon Kenya 2025 {/*rendercon-kenya-2025*/}
+October 04, 2025. Nairobi, Kenya
+
+[Website](https://rendercon.org/) - [Twitter](https://twitter.com/renderconke) - [LinkedIn](https://www.linkedin.com/company/renderconke/) - [YouTube](https://www.youtube.com/channel/UC0bCcG8gHUL4njDOpQGcMIA)
+
 ### React Conf 2025 {/*react-conf-2025*/}
 October 7-8, 2025. Henderson, Nevada, USA and free livestream
 

src/content/community/conferences.md

@@ -58,6 +58,7 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet
 * [Manchester](https://www.meetup.com/Manchester-React-User-Group/)
 * [React.JS Girls London](https://www.meetup.com/ReactJS-Girls-London/)
 * [React Advanced London](https://guild.host/react-advanced-london)
+* [React Native Liverpool](https://www.meetup.com/react-native-liverpool/)
 * [React Native London](https://guild.host/RNLDN)
 
 ## Finland {/*finland*/}
@@ -137,6 +138,9 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet
 ## Portugal {/*portugal*/}
 * [Lisbon](https://www.meetup.com/JavaScript-Lisbon/)
 
+## Scotland (UK) {/*scotland-uk*/}
+* [Edinburgh](https://www.meetup.com/react-edinburgh/)
+
 ## Spain {/*spain*/}
 * [Barcelona](https://www.meetup.com/ReactJS-Barcelona/)
 

src/content/community/meetups.md

@@ -122,7 +122,7 @@ For code-splitting instructions, see your build tool docs:
 
 ### Improving Application Performance {/*improving-application-performance*/}
 
-Since the build tool you select only support single page apps (SPAs) you'll need to implement other [rendering patterns](https://www.patterns.dev/vanilla/rendering-patterns) like server-side rendering (SSR), static site generation (SSG), and/or React Server Components (RSC). Even if you don't need these features at first, in the future there may be some routes that would benefit SSR, SSG or RSC.
+Since the build tool you select only supports single page apps (SPAs), you'll need to implement other [rendering patterns](https://www.patterns.dev/vanilla/rendering-patterns) like server-side rendering (SSR), static site generation (SSG), and/or React Server Components (RSC). Even if you don't need these features at first, in the future there may be some routes that would benefit SSR, SSG or RSC.
 
 * **Single-page apps (SPA)** load a single HTML page and dynamically updates the page as the user interacts with the app. SPAs are easier to get started with, but they can have slower initial load times. SPAs are the default architecture for most build tools.
 

src/content/learn/build-a-react-app-from-scratch.md

@@ -247,13 +247,13 @@ export default function CatFriends() {
       <nav>
         <button onClick={() => scrollToCat(catList[0])}>Neo</button>
         <button onClick={() => scrollToCat(catList[5])}>Millie</button>
-        <button onClick={() => scrollToCat(catList[9])}>Bella</button>
+        <button onClick={() => scrollToCat(catList[8])}>Bella</button>
       </nav>
       <div>
         <ul>
           {catList.map((cat) => (
             <li
-              key={cat}
+              key={cat.id}
               ref={(node) => {
                 const map = getMap();
                 map.set(cat, node);
@@ -263,7 +263,7 @@ export default function CatFriends() {
                 };
               }}
             >
-              <img src={cat} />
+              <img src={cat.imageUrl} />
             </li>
           ))}
         </ul>
@@ -273,11 +273,22 @@ export default function CatFriends() {
 }
 
 function setupCatList() {
-  const catList = [];
-  for (let i = 0; i < 10; i++) {
-    catList.push("https://loremflickr.com/320/240/cat?lock=" + i);
+  const catCount = 10;
+  const catList = new Array(catCount)
+  for (let i = 0; i < catCount; i++) {
+    let imageUrl = '';
+    if (i < 5) {
+      imageUrl = "https://placecats.com/neo/320/240";
+    } else if (i < 8) {
+      imageUrl = "https://placecats.com/millie/320/240";
+    } else {
+      imageUrl = "https://placecats.com/bella/320/240";
+    }
+    catList[i] = {
+      id: i,
+      imageUrl,
+    };
   }
-
   return catList;
 }
 
@@ -893,12 +904,30 @@ export default function CatFriends() {
   );
 }
 
-const catList = [];
-for (let i = 0; i < 10; i++) {
-  catList.push({
+const catCount = 10;
+const catList = new Array(catCount);
+for (let i = 0; i < catCount; i++) {
+  const bucket = Math.floor(Math.random() * catCount) % 2;
+  let imageUrl = '';
+  switch (bucket) {
+    case 0: {
+      imageUrl = "https://placecats.com/neo/250/200";
+      break;
+    }
+    case 1: {
+      imageUrl = "https://placecats.com/millie/250/200";
+      break;
+    }
+    case 2:
+    default: {
+      imageUrl = "https://placecats.com/bella/250/200";
+      break;
+    }
+  }
+  catList[i] = {
     id: i,
-    imageUrl: 'https://loremflickr.com/250/200/cat?lock=' + i
-  });
+    imageUrl,
+  };
 }
 
 ```
@@ -978,7 +1007,7 @@ export default function CatFriends() {
             behavior: 'smooth',
             block: 'nearest',
             inline: 'center'
-          });            
+          });
         }}>
           Next
         </button>
@@ -1010,12 +1039,30 @@ export default function CatFriends() {
   );
 }
 
-const catList = [];
-for (let i = 0; i < 10; i++) {
-  catList.push({
+const catCount = 10;
+const catList = new Array(catCount);
+for (let i = 0; i < catCount; i++) {
+  const bucket = Math.floor(Math.random() * catCount) % 2;
+  let imageUrl = '';
+  switch (bucket) {
+    case 0: {
+      imageUrl = "https://placecats.com/neo/250/200";
+      break;
+    }
+    case 1: {
+      imageUrl = "https://placecats.com/millie/250/200";
+      break;
+    }
+    case 2:
+    default: {
+      imageUrl = "https://placecats.com/bella/250/200";
+      break;
+    }
+  }
+  catList[i] = {
     id: i,
-    imageUrl: 'https://loremflickr.com/250/200/cat?lock=' + i
-  });
+    imageUrl,
+  };
 }
 
 ```

src/content/learn/manipulating-the-dom-with-refs.md

@@ -50,6 +50,21 @@ const ExpensiveComponent = memo(function ExpensiveComponent({ data, onClick }) {
 });
 ```
 
+
+<Note>
+
+This manual memoization has a subtle bug that breaks memoization:
+
+```js [[2, 1, "() => handleClick(item)"]]
+<Item key={item.id} onClick={() => handleClick(item)} />
+```
+
+Even though `handleClick` is wrapped in `useCallback`, the arrow function `() => handleClick(item)` creates a new function every time the component renders. This means that `Item` will always receive a new `onClick` prop, breaking memoization.
+
+React Compiler is able to optimize this correctly with or without the arrow function, ensuring that `Item` only re-renders when `props.onClick` changes.
+
+</Note>
+
 ### After React Compiler {/*after-react-compiler*/}
 
 With React Compiler, you write the same code without manual memoization:
@@ -74,7 +89,7 @@ function ExpensiveComponent({ data, onClick }) {
 
 _[See this example in the React Compiler Playground](https://playground.react.dev/#N4Igzg9grgTgxgUxALhAMygOzgFwJYSYAEAogB4AOCmYeAbggMIQC2Fh1OAFMEQCYBDHAIA0RQowA2eOAGsiAXwCURYAB1iROITA4iFGBERgwCPgBEhAogF4iCStVoMACoeO1MAcy6DhSgG4NDSItHT0ACwFMPkkmaTlbIi48HAQWFRsAPlUQ0PFMKRlZFLSWADo8PkC8hSDMPJgEHFhiLjzQgB4+eiyO-OADIwQTM0thcpYBClL02xz2zXz8zoBJMqJZBABPG2BU9Mq+BQKiuT2uTJyomLizkoOMk4B6PqX8pSUFfs7nnro3qEapgFCAFEA)_
 
-React Compiler automatically applies the equivalent optimizations, ensuring your app only re-renders when necessary.
+React Compiler automatically applies the optimal memoization, ensuring your app only re-renders when necessary.
 
 <DeepDive>
 #### What kind of memoization does React Compiler add? {/*what-kind-of-memoization-does-react-compiler-add*/}