reactjs · react-translations-bot · Sep 19, 2023 · Sep 20, 2023 · Sep 21, 2023 · Sep 22, 2023
diff --git a/.env.production b/.env.production
@@ -1 +1 @@
-NEXT_PUBLIC_GA_TRACKING_ID = 'UA-41298772-4'
+NEXT_PUBLIC_GA_TRACKING_ID = 'G-B1E83PJ3RT'
diff --git a/package.json b/package.json
@@ -30,13 +30,12 @@
     "classnames": "^2.2.6",
     "date-fns": "^2.16.1",
     "debounce": "^1.2.1",
-    "ga-lite": "^2.1.4",
     "github-slugger": "^1.3.0",
     "next": "^13.4.1",
     "next-remote-watch": "^1.0.0",
     "parse-numeric-range": "^1.2.0",
     "react": "^0.0.0-experimental-16d053d59-20230506",
-    "react-collapsed": "npm:@gaearon/[email protected]",
+    "react-collapsed": "4.0.4",
     "react-dom": "^0.0.0-experimental-16d053d59-20230506",
     "remark-frontmatter": "^4.0.1",
     "remark-gfm": "^3.0.1"

diff --git a/public/images/docs/diagrams/conditional_render_tree.dark.png b/public/images/docs/diagrams/conditional_render_tree.dark.png
diff --git a/public/images/docs/diagrams/conditional_render_tree.png b/public/images/docs/diagrams/conditional_render_tree.png
diff --git a/public/images/docs/diagrams/generic_dependency_tree.dark.png b/public/images/docs/diagrams/generic_dependency_tree.dark.png
diff --git a/public/images/docs/diagrams/generic_dependency_tree.png b/public/images/docs/diagrams/generic_dependency_tree.png
diff --git a/public/images/docs/diagrams/generic_render_tree.dark.png b/public/images/docs/diagrams/generic_render_tree.dark.png
diff --git a/public/images/docs/diagrams/generic_render_tree.png b/public/images/docs/diagrams/generic_render_tree.png
diff --git a/public/images/docs/diagrams/module_dependency_tree.dark.png b/public/images/docs/diagrams/module_dependency_tree.dark.png
diff --git a/public/images/docs/diagrams/module_dependency_tree.png b/public/images/docs/diagrams/module_dependency_tree.png
diff --git a/public/images/docs/diagrams/render_tree.dark.png b/public/images/docs/diagrams/render_tree.dark.png
diff --git a/public/images/docs/diagrams/render_tree.png b/public/images/docs/diagrams/render_tree.png
diff --git a/public/images/team/dave-mccabe.jpg b/public/images/team/dave-mccabe.jpg
diff --git a/public/images/team/lunaruan.jpg b/public/images/team/lunaruan.jpg
diff --git a/public/images/team/mengdi-chen.jpg b/public/images/team/mengdi-chen.jpg
diff --git a/public/images/team/sean-keegan.jpg b/public/images/team/sean-keegan.jpg
diff --git a/src/components/Layout/Feedback.tsx b/src/components/Layout/Feedback.tsx
@@ -4,7 +4,6 @@
 
 import {useState} from 'react';
 import {useRouter} from 'next/router';
-import {ga} from '../../utils/analytics';
 
 export function Feedback({onSubmit = () => {}}: {onSubmit?: () => void}) {
   const {asPath} = useRouter();
@@ -48,14 +47,12 @@ const thumbsDownIcon = (
 function sendGAEvent(isPositive: boolean) {
   // Fragile. Don't change unless you've tested the network payload
   // and verified that the right events actually show up in GA.
-  ga(
-    'send',
-    'event',
-    'button',
-    'feedback',
-    window.location.pathname,
-    isPositive ? '1' : '0'
-  );
+  // @ts-ignore
+  gtag('event', 'feedback', {
+    event_category: 'button',
+    event_label: window.location.pathname,
+    value: isPositive ? 1 : 0,
+  });
 }
 
 function SendFeedback({onSubmit}: {onSubmit: () => void}) {

diff --git a/src/components/Layout/HomeContent.js b/src/components/Layout/HomeContent.js
@@ -1654,8 +1654,8 @@ function LikeButton({video}) {
     <button
       data-hover="LikeButton"
       className={cn(
-        'outline-none focus:bg-red-50/5 focus:text-red-50 relative flex items-center justify-center w-10 h-10 cursor-pointer rounded-full text-tertiary hover:bg-card active:scale-95 active:bg-red-50/5 active:text-red-50',
-        isLiked && 'text-red-50'
+        'outline-none focus:bg-red-50/5 focus:text-red-50 relative flex items-center justify-center w-10 h-10 cursor-pointer rounded-full hover:bg-card active:scale-95 active:bg-red-50/5 active:text-red-50',
+        isLiked ? 'text-red-50' : 'text-tertiary'
       )}
       aria-label={isLiked ? 'Unsave' : 'Save'}
       onClick={() => {

diff --git a/src/components/Layout/Page.tsx b/src/components/Layout/Page.tsx
@@ -28,7 +28,12 @@ interface PageProps {
   children: React.ReactNode;
   toc: Array<TocItem>;
   routeTree: RouteItem;
-  meta: {title?: string; canary?: boolean; description?: string};
+  meta: {
+    title?: string;
+    titleForTitleTag?: string;
+    canary?: boolean;
+    description?: string;
+  };
   section: 'learn' | 'reference' | 'community' | 'blog' | 'home' | 'unknown';
 }
 
@@ -107,6 +112,7 @@ export function Page({children, toc, routeTree, meta, section}: PageProps) {
     <>
       <Seo
         title={title}
+        titleForTitleTag={meta.titleForTitleTag}
         isHomePage={isHomePage}
         image={`/images/og-` + section + '.png'}
         searchOrder={searchOrder}

diff --git a/src/components/Layout/Sidebar/SidebarRouteTree.tsx b/src/components/Layout/Sidebar/SidebarRouteTree.tsx
@@ -7,7 +7,7 @@ import {useRef, useLayoutEffect, Fragment} from 'react';
 import cn from 'classnames';
 import {useRouter} from 'next/router';
 import {SidebarLink} from './SidebarLink';
-import useCollapse from 'react-collapsed';
+import {useCollapse} from 'react-collapsed';
 import usePendingRoute from 'hooks/usePendingRoute';
 import type {RouteItem} from 'components/Layout/getRouteMeta';
 

diff --git a/src/components/Layout/Toc.tsx b/src/components/Layout/Toc.tsx
@@ -27,8 +27,7 @@ export function Toc({headings}: {headings: Toc}) {
         <ul className="space-y-2 pb-16">
           {headings.length > 0 &&
             headings.map((h, i) => {
-              if (h.url == null) {
-                // TODO: only log in DEV
+              if (!h.url && process.env.NODE_ENV === 'development') {
                 console.error('Heading does not have URL');
               }
               return (

diff --git a/src/components/MDX/Sandpack/Preview.tsx b/src/components/MDX/Sandpack/Preview.tsx
@@ -52,6 +52,12 @@ export function Preview({
     rawError = null;
   }
 
+  // When throwing a new Error in Sandpack - we want to disable the dev error dialog
+  // to show the Error Boundary fallback
+  if (rawError && rawError.message.includes(`throw Error('Example error')`)) {
+    rawError = null;
+  }
+
   // Memoized because it's fed to debouncing.
   const firstLintError = useMemo(() => {
     if (lintErrors.length === 0) {

diff --git a/src/components/Seo.tsx b/src/components/Seo.tsx
@@ -9,6 +9,7 @@ import {siteConfig} from '../siteConfig';
 
 export interface SeoProps {
   title: string;
+  titleForTitleTag: undefined | string;
   description?: string;
   image?: string;
   // jsonld?: JsonLDType | Array<JsonLDType>;
@@ -21,19 +22,13 @@ const deployedTranslations = [
   'en',
   'zh-hans',
   'es',
+  'fr',
+  'ja',
   // We'll add more languages when they have enough content.
   // Please DO NOT edit this list without a discussion in the reactjs/react.dev repo.
   // It must be the same between all translations.
 ];
 
-let shouldPreventIndexing = false;
-if (
-  siteConfig.languageCode !== 'en' &&
-  !deployedTranslations.includes(siteConfig.languageCode)
-) {
-  shouldPreventIndexing = true;
-}
-
 function getDomain(languageCode: string): string {
   const subdomain = languageCode === 'en' ? '' : languageCode + '.';
   return subdomain + 'react.dev';
@@ -42,7 +37,7 @@ function getDomain(languageCode: string): string {
 export const Seo = withRouter(
   ({
     title,
-    description = 'The library for web and native user interfaces',
+    titleForTitleTag,
     image = '/images/og-default.png',
     router,
     children,
@@ -53,14 +48,20 @@ export const Seo = withRouter(
     const canonicalUrl = `https://${siteDomain}${
       router.asPath.split(/[\?\#]/)[0]
     }`;
-    const pageTitle = isHomePage ? title : title + ' – React';
+    // Allow setting a different title for Google results
+    const pageTitle =
+      (titleForTitleTag ?? title) + (isHomePage ? '' : ' – React');
     // Twitter's meta parser is not very good.
     const twitterTitle = pageTitle.replace(/[<>]/g, '');
+    let description = isHomePage
+      ? 'React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations.'
+      : 'The library for web and native user interfaces';
     return (
       <Head>
         <meta name="viewport" content="width=device-width, initial-scale=1" />
         {title != null && <title key="title">{pageTitle}</title>}
-        {description != null && (
+        {isHomePage && (
+          // Let Google figure out a good description for each page.
           <meta name="description" key="description" content={description} />
         )}
         <link rel="canonical" href={canonicalUrl} />
@@ -69,7 +70,6 @@ export const Seo = withRouter(
           href={canonicalUrl.replace(siteDomain, getDomain('en'))}
           hrefLang="x-default"
         />
-        {shouldPreventIndexing && <meta name="robots" content="noindex" />}
         {deployedTranslations.map((languageCode) => (
           <link
             key={'alt-' + languageCode}

diff --git a/src/content/blog/2022/06/15/react-labs-what-we-have-been-working-on-june-2022.md b/src/content/blog/2022/06/15/react-labs-what-we-have-been-working-on-june-2022.md
@@ -8,7 +8,7 @@ June 15, 2022 by [Andrew Clark](https://twitter.com/acdlite), [Dan Abramov](http
 
 <Intro>
 
-[React 18](https://reactjs.org/blog/2022/03/29/react-v18) was years in the making, and with it brought valuable lessons for the React team. Its release was the result of many years of research and exploring many paths. Some of those paths were successful; many more were dead-ends that led to new insights. One lesson we’ve learned is that it’s frustrating for the community to wait for new features without having insight into these paths that we’re exploring.
+[React 18](https://react.dev/blog/2022/03/29/react-v18) was years in the making, and with it brought valuable lessons for the React team. Its release was the result of many years of research and exploring many paths. Some of those paths were successful; many more were dead-ends that led to new insights. One lesson we’ve learned is that it’s frustrating for the community to wait for new features without having insight into these paths that we’re exploring.
 
 </Intro>
 

diff --git a/src/content/community/acknowledgements.md b/src/content/community/acknowledgements.md
@@ -24,6 +24,7 @@ We'd like to recognize a few people who have made significant contributions to R
 * [Christoph Nakazawa](https://github.com/cpojer)
 * [Christopher Chedeau](https://github.com/vjeux)
 * [Clement Hoang](https://github.com/clemmy)
+* [Dave McCabe](https://github.com/davidmccabe)
 * [Dominic Gannaway](https://github.com/trueadm)
 * [Flarnie Marchan](https://github.com/flarnie)
 * [Jason Quense](https://github.com/jquense)
@@ -33,8 +34,10 @@ We'd like to recognize a few people who have made significant contributions to R
 * [Josh Duck](https://github.com/joshduck)
 * [Joe Critchley](https://github.com/joecritch)
 * [Jeff Morrison](https://github.com/jeffmo)
+* [Luna Ruan](https://github.com/lunaruan)
 * [Keyan Zhang](https://github.com/keyz)
 * [Marco Salazar](https://github.com/salazarm)
+* [Mengdi Chen](https://github.com/mondaychen)
 * [Nat Alison](https://github.com/tesseralis)
 * [Nathan Hunzaker](https://github.com/nhunzaker)
 * [Nicolas Gallagher](https://github.com/necolas)
@@ -45,7 +48,7 @@ We'd like to recognize a few people who have made significant contributions to R
 * [Robert Zhang](https://github.com/robertzhidealx)
 * [Sander Spies](https://github.com/sanderspies)
 * [Sasha Aickin](https://github.com/aickin)
-* [Seth Webster](https://github.com/sethwebster)
+* [Sean Keegan](https://github.com/seanryankeegan)
 * [Sophia Shoemaker](https://github.com/mrscobbler)
 * [Sunil Pai](https://github.com/threepointone)
 * [Tim Yung](https://github.com/yungsters)

diff --git a/src/content/community/conferences.md b/src/content/community/conferences.md
@@ -61,7 +61,6 @@ October 27th 2023. In-person in Verona, Italy and online (hybrid event)
 
 [Website](https://2023.reactjsday.it/) - [Twitter](https://twitter.com/reactjsday) - [Facebook](https://www.facebook.com/GrUSP/) - [YouTube](https://www.youtube.com/c/grusp)
 
-
 ### React Summit US 2023 {/*react-summit-us-2023*/}
 November 13 & 15, 2023. In-person in New York, US + remote first interactivity (hybrid event)
 
@@ -72,6 +71,11 @@ December 8 & 12, 2023. In-person in Berlin, Germany + remote first interactivity
 
 [Website](https://reactday.berlin) - [Twitter](https://twitter.com/reactdayberlin) - [Facebook](https://www.facebook.com/reactdayberlin/) - [Videos](https://portal.gitnation.org/events/react-day-berlin-2023)
 
+### App.js Conf 2024 {/*appjs-conf-2024*/}
+May 22 - 24, 2024. In-person in Kraków, Poland + remote
+
+[Website](https://appjs.co) - [Twitter](https://twitter.com/appjsconf)
+
 ### Render(ATL) 2024 🍑 {/*renderatl-2024-*/}
 June 12 - June 14, 2024. Atlanta, GA, USA
 

diff --git a/src/content/community/meetups.md b/src/content/community/meetups.md
@@ -48,6 +48,7 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet
 * [Montreal, QC - React Native](https://www.meetup.com/fr-FR/React-Native-MTL/)
 * [Vancouver, BC](https://www.meetup.com/ReactJS-Vancouver-Meetup/)
 * [Ottawa, ON](https://www.meetup.com/Ottawa-ReactJS-Meetup/)
+* [Saskatoon, SK](https://www.meetup.com/saskatoon-react-meetup/)
 * [Toronto, ON](https://www.meetup.com/Toronto-React-Native/events/)
 
 ## Chile {/*chile*/}

diff --git a/src/content/community/team.md b/src/content/community/team.md
@@ -26,10 +26,6 @@ Current members of the React team are listed in alphabetical order below.
     Dan got into programming after he accidentally discovered Visual Basic inside Microsoft PowerPoint. He has found his true calling in turning [Sebastian](#sebastian-markbåge)'s tweets into long-form blog posts. Dan occasionally wins at Fortnite by hiding in a bush until the game ends.
 </TeamMember>
 
-<TeamMember name="Dave McCabe" permalink="dave-mccabe" photo="/images/team/dave-mccabe.jpg" github="davidmccabe" twitter="mcc_abe" title="Engineer at Meta">
-    An engineer by trade and outdoorsman at heart, David has long been an innovator in the field of programming-while-sunbathing. Besides surprising his colleagues with unique outdoor video-call backgrounds, he enjoys playing guitar (in sunlit meadows, of course) and martial arts (still indoors, gotta work on that). 
-</TeamMember>
-
 <TeamMember name="Eli White" permalink="eli-white" photo="/images/team/eli-white.jpg" github="TheSavior" twitter="Eli_White" title="Engineering Manager at Meta">
     Eli got into programming after he got suspended from middle school for hacking. He has been working on React and React Native since 2017. He enjoys eating treats, especially ice cream and apple pie. You can find Eli trying quirky activities like parkour, indoor skydiving, and aerial silks.
 </TeamMember>
@@ -54,10 +50,6 @@ Current members of the React team are listed in alphabetical order below.
     Lauren’s programming career peaked when she first discovered the `<marquee>` tag. She’s been chasing that high ever since. When she’s not adding bugs into React, she enjoys dropping cheeky memes in chat, and playing all too many video games with her partner, and her dog Zelda.
 </TeamMember>
 
-<TeamMember name="Luna Ruan" permalink="luna-ruan" photo="/images/team/lunaruan.jpg" github="lunaruan" twitter="lunaruan" title="Independent Engineer">
-    Luna learned programming because she thought it meant creating video games. Instead, she ended up working on the Pinterest web app, and now on React itself. Luna doesn't want to make video games anymore, but she plans to do creative writing if she ever gets bored.
-</TeamMember>
-
 <TeamMember name="Luna Wei" permalink="luna-wei" photo="/images/team/luna-wei.jpg" github="lunaleaps" twitter="lunaleaps" title="Engineer at Meta">
     Luna first learnt the fundamentals of python at the age of 6 from her father. Since then, she has been unstoppable. Luna aspires to be a gen z, and the road to success is paved with environmental advocacy, urban gardening and lots of quality time with her Voo-Doo’d (as pictured). 
 </TeamMember>
@@ -66,10 +58,6 @@ Current members of the React team are listed in alphabetical order below.
     Matt stumbled into coding, and since then, has become enamored with creating things in communities that can’t be created alone. Prior to React, he worked on YouTube, the Google Assistant, Fuchsia, and Google Cloud AI and Evernote. When he's not trying to make better developer tools he enjoys the mountains, jazz, and spending time with his family.
 </TeamMember>
 
-<TeamMember name="Mengdi Chen" permalink="mengdi-chen" photo="/images/team/mengdi-chen.jpg" github="mondaychen" twitter="mengdi_en" title="Engineer at Meta">
-    While working on his Digital Arts degree Mengdi was conceited about his front-end skills because his CSS worked perfectly even on IE6. But soon React opened a new door of programming for him, and he has been dreaming of joining the React team ever since. Outside of work, he is usually busy chasing his two kids around or collecting strange recipes.
-</TeamMember>
-
 <TeamMember name="Mofei Zhang" permalink="mofei-zhang" photo="/images/team/mofei-zhang.png" github="mofeiZ" title="Engineer at Meta">
     Mofei started programming when she realized it can help her cheat in video games. She focused on operating systems in undergrad / grad school, but now finds herself happily tinkering on React. Outside of work, she enjoys debugging bouldering problems and planning her next backpacking trip(s).
 </TeamMember>
@@ -86,10 +74,6 @@ Current members of the React team are listed in alphabetical order below.
     Sathya hated the Dragon Book in school but somehow ended up working on compilers all his career. When he's not compiling React components, he's either drinking coffee or eating yet another Dosa.
 </TeamMember>
 
-<TeamMember name="Sean Keegan" permalink="sean-keegan" photo="/images/team/sean-keegan.jpg" github="seanryankeegan" twitter="DevRelSean" title="Developer Advocate at Meta">
-    After a first career as a math teacher, Sean remembered that one intro to comp sci class he had to take as a prereq and thought “that was kind of fun!”. One coding bootcamp and several tech jobs later, Sean discovered developer advocacy and hasn’t looked back. Outside of work, Sean enjoys ultimate frisbee, video games, and researching (but rarely implementing) better ways to care for his houseplants.
-</TeamMember>
-
 <TeamMember name="Sebastian Markbåge" permalink="sebastian-markbåge" photo="/images/team/sebmarkbage.jpg" github="sebmarkbage" twitter="sebmarkbage" title="Engineer at Vercel">
     Sebastian majored in psychology. He's usually quiet. Even when he says something, it often doesn't make sense to the rest of us until a few months later. The correct way to pronounce his surname is "mark-boa-geh" but he settled for "mark-beige" out of pragmatism -- and that's how he approaches React.
 </TeamMember>

diff --git a/src/content/learn/describing-the-ui.md b/src/content/learn/describing-the-ui.md
@@ -18,6 +18,7 @@ React is a JavaScript library for rendering user interfaces (UI). UI is built fr
 * [How to conditionally render components](/learn/conditional-rendering)
 * [How to render multiple components at a time](/learn/rendering-lists)
 * [How to avoid confusing bugs by keeping components pure](/learn/keeping-components-pure)
+* [Why understanding your UI as trees is useful](/learn/understanding-your-ui-as-a-tree)
 
 </YouWillLearn>
 
@@ -523,6 +524,37 @@ Read **[Keeping Components Pure](/learn/keeping-components-pure)** to learn how
 
 </LearnMore>
 
+## Your UI as a tree {/*your-ui-as-a-tree*/}
+
+React uses trees to model the relationships between components and modules. 
+
+A React render tree is a representation of the parent and child relationship between components. 
+
+<Diagram name="generic_render_tree" height={250} width={500} alt="A tree graph with five nodes, with each node representing a component. The root node is located at the top the tree graph and is labelled 'Root Component'. It has two arrows extending down to two nodes labelled 'Component A' and 'Component C'. Each of the arrows is labelled with 'renders'. 'Component A' has a single 'renders' arrow to a node labelled 'Component B'. 'Component C' has a single 'renders' arrow to a node labelled 'Component D'.">
+
+An example React render tree.
+
+</Diagram>
+
+Components near the top of the tree, near the root component, are considered top-level components. Components with no child components are leaf components. This categorization of components is useful for understanding data flow and rendering performance.
+
+Modelling the relationship between JavaScript modules is another useful way to understand your app. We refer to it as a module dependency tree. 
+
+<Diagram name="generic_dependency_tree" height={250} width={500} alt="A tree graph with five nodes. Each node represents a JavaScript module. The top-most node is labelled 'RootModule.js'. It has three arrows extending to the nodes: 'ModuleA.js', 'ModuleB.js', and 'ModuleC.js'. Each arrow is labelled as 'imports'. 'ModuleC.js' node has a single 'imports' arrow that points to a node labelled 'ModuleD.js'.">
+
+An example module dependency tree.
+
+</Diagram>
+
+A dependency tree is often used by build tools to bundle all the relevant JavaScript code for the client to download and render. A large bundle size regresses user experience for React apps. Understanding the module dependency tree is helpful to debug such issues. 
+
+<LearnMore path="/learn/understanding-your-ui-as-a-tree">
+
+Read **[Your UI as a Tree](/learn/understanding-your-ui-as-a-tree)** to learn how to create a render and module dependency trees for a React app and how they're useful mental models for improving user experience and performance.
+
+</LearnMore>
+
+
 ## What's next? {/*whats-next*/}
 
 Head over to [Your First Component](/learn/your-first-component) to start reading this chapter page by page!

diff --git a/src/content/learn/passing-props-to-a-component.md b/src/content/learn/passing-props-to-a-component.md
@@ -462,7 +462,7 @@ export default function Gallery() {
           </li>
           <li>
             <b>Discovered: </b>
-            polonium (element)
+            polonium (chemical element)
           </li>
         </ul>
       </section>
Original file line number	Diff line number	Diff line change
		@@ -1 +1 @@
		NEXT_PUBLIC_GA_TRACKING_ID = 'UA-41298772-4'
		NEXT_PUBLIC_GA_TRACKING_ID = 'G-B1E83PJ3RT'
-Original file line number
+Diff line change
@@ Expand Up @@
     <Intro>
-    [React 18](https://reactjs.org/blog/2022/03/29/react-v18) was years in the making, and with it brought valuable lessons for the React team. Its release was the result of many years of research and exploring many paths. Some of those paths were successful; many more were dead-ends that led to new insights. One lesson we’ve learned is that it’s frustrating for the community to wait for new features without having insight into these paths that we’re exploring.
+    [React 18](https://react.dev/blog/2022/03/29/react-v18) was years in the making, and with it brought valuable lessons for the React team. Its release was the result of many years of research and exploring many paths. Some of those paths were successful; many more were dead-ends that led to new insights. One lesson we’ve learned is that it’s frustrating for the community to wait for new features without having insight into these paths that we’re exploring.
     </Intro>
@@ Expand Down @@