Merge pull request #539 from reactjs/sync-fcd00068

Sync with react.dev @ fcd0006

.env.production

@@ -1 +1 @@
-NEXT_PUBLIC_GA_TRACKING_ID = 'UA-41298772-4'
+NEXT_PUBLIC_GA_TRACKING_ID = 'G-B1E83PJ3RT'

package.json

@@ -30,7 +30,6 @@
     "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",

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();
@@ -46,16 +45,16 @@ const thumbsDownIcon = (
 );
 
 function sendGAEvent(isPositive: boolean) {
+  const category = isPositive ? 'like_button' : 'dislike_button';
+  const value = isPositive ? 1 : 0;
   // 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: category,
+    event_label: window.location.pathname,
+    event_value: value,
+  });
 }
 
 function SendFeedback({onSubmit}: {onSubmit: () => void}) {

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}

src/components/Layout/Sidebar/SidebarLink.tsx

@@ -77,7 +77,7 @@ export function SidebarLink({
         {title}{' '}
         {canary && (
           <IconCanary
-            title="This feature is available in the latest Canary"
+            title=" - This feature is available in the latest Canary"
             className="ms-2 text-gray-30 dark:text-gray-60 inline-block w-4 h-4 align-[-3px]"
           />
         )}

src/components/Layout/getRouteMeta.tsx

@@ -58,13 +58,13 @@ export interface RouteMeta {
   order?: number;
 }
 
-type TravesalContext = RouteMeta & {
+type TraversalContext = RouteMeta & {
   currentIndex: number;
 };
 
 export function getRouteMeta(cleanedPath: string, routeTree: RouteItem) {
   const breadcrumbs = getBreadcrumbs(cleanedPath, routeTree);
-  const ctx: TravesalContext = {
+  const ctx: TraversalContext = {
     currentIndex: 0,
   };
   buildRouteMeta(cleanedPath, routeTree, ctx);
@@ -79,7 +79,7 @@ export function getRouteMeta(cleanedPath: string, routeTree: RouteItem) {
 function buildRouteMeta(
   searchPath: string,
   currentRoute: RouteItem,
-  ctx: TravesalContext
+  ctx: TraversalContext
 ) {
   ctx.currentIndex++;
 

src/components/MDX/MDXComponents.tsx

@@ -243,7 +243,7 @@ function Illustration({
           src={src}
           alt={alt}
           style={{maxHeight: 300}}
-          className="bg-white rounded-lg"
+          className="rounded-lg"
         />
         {caption ? (
           <figcaption className="text-center leading-tight mt-4">
@@ -275,7 +275,12 @@ function IllustrationBlock({
   const images = imageInfos.map((info, index) => (
     <figure key={index}>
       <div className="bg-white rounded-lg p-4 flex-1 flex xl:p-6 justify-center items-center my-4">
-        <img src={info.src} alt={info.alt} height={info.height} />
+        <img
+          className="text-primary"
+          src={info.src}
+          alt={info.alt}
+          height={info.height}
+        />
       </div>
       {info.caption ? (
         <figcaption className="text-secondary dark:text-secondary-dark text-center leading-tight mt-4">

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) {

src/components/PageHeading.tsx

@@ -34,7 +34,7 @@ function PageHeading({
           {title}
           {canary && (
             <IconCanary
-              title="This feature is available in the latest Canary"
+              title=" - This feature is available in the latest Canary"
               className="ms-4 mt-1 text-gray-50 dark:text-gray-40 inline-block w-6 h-6 align-[-1px]"
             />
           )}

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>;
@@ -36,7 +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,
@@ -47,14 +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} />

src/content/blog/2022/03/08/react-18-upgrade-guide.md

@@ -224,8 +224,8 @@ For more information, see the [Automatic batching deep dive](https://github.com/
 
 In the React 18 Working Group we worked with library maintainers to create new APIs needed to support concurrent rendering for use cases specific to their use case in areas like styles, and external stores. To support React 18, some libraries may need to switch to one of the following APIs:
 
-* `useSyncExternalStore` is a new hook that allows external stores to support concurrent reads by forcing updates to the store to be synchronous. This new API is recommended for any library that integrates with state external to React. For more information, see the [useSyncExternalStore overview post](https://github.com/reactwg/react-18/discussions/70) and [useSyncExternalStore API details](https://github.com/reactwg/react-18/discussions/86).
-* `useInsertionEffect` is a new hook that allows CSS-in-JS libraries to address performance issues of injecting styles in render. Unless you've already built a CSS-in-JS library we don't expect you to ever use this. This hook will run after the DOM is mutated, but before layout effects read the new layout. This solves an issue that already exists in React 17 and below, but is even more important in React 18 because React yields to the browser during concurrent rendering, giving it a chance to recalculate layout. For more information, see the [Library Upgrade Guide for `<style>`](https://github.com/reactwg/react-18/discussions/110).
+* `useSyncExternalStore` is a new Hook that allows external stores to support concurrent reads by forcing updates to the store to be synchronous. This new API is recommended for any library that integrates with state external to React. For more information, see the [useSyncExternalStore overview post](https://github.com/reactwg/react-18/discussions/70) and [useSyncExternalStore API details](https://github.com/reactwg/react-18/discussions/86).
+* `useInsertionEffect` is a new Hook that allows CSS-in-JS libraries to address performance issues of injecting styles in render. Unless you've already built a CSS-in-JS library we don't expect you to ever use this. This Hook will run after the DOM is mutated, but before layout effects read the new layout. This solves an issue that already exists in React 17 and below, but is even more important in React 18 because React yields to the browser during concurrent rendering, giving it a chance to recalculate layout. For more information, see the [Library Upgrade Guide for `<style>`](https://github.com/reactwg/react-18/discussions/110).
 
 React 18 also introduces new APIs for concurrent rendering such as `startTransition`, `useDeferredValue` and `useId`, which we share more about in the [release post](/blog/2022/03/29/react-v18).
 

src/content/blog/2022/03/29/react-v18.md

@@ -139,8 +139,8 @@ startTransition(() => {
 Updates wrapped in startTransition are handled as non-urgent and will be interrupted if more urgent updates like clicks or key presses come in. If a transition gets interrupted by the user (for example, by typing multiple characters in a row), React will throw out the stale rendering work that wasn’t finished and render only the latest update.
 
 
-* `useTransition`: a hook to start transitions, including a value to track the pending state.
-* `startTransition`: a method to start transitions when the hook cannot be used.
+* `useTransition`: a Hook to start transitions, including a value to track the pending state.
+* `startTransition`: a method to start transitions when the Hook cannot be used.
 
 Transitions will opt in to concurrent rendering, which allows the update to be interrupted. If the content re-suspends, transitions also tell React to continue showing the current content while rendering the transition content in the background (see the [Suspense RFC](https://github.com/reactjs/rfcs/blob/main/text/0213-suspense-in-react-18.md) for more info).
 
@@ -229,7 +229,7 @@ With Strict Mode in React 18, React will simulate unmounting and remounting the
 
 #### useId {/*useid*/}
 
-`useId` is a new hook for generating unique IDs on both the client and server, while avoiding hydration mismatches. It is primarily useful for component libraries integrating with accessibility APIs that require unique IDs. This solves an issue that already exists in React 17 and below, but it's even more important in React 18 because of how the new streaming server renderer delivers HTML out-of-order. [See docs here](/reference/react/useId).
+`useId` is a new Hook for generating unique IDs on both the client and server, while avoiding hydration mismatches. It is primarily useful for component libraries integrating with accessibility APIs that require unique IDs. This solves an issue that already exists in React 17 and below, but it's even more important in React 18 because of how the new streaming server renderer delivers HTML out-of-order. [See docs here](/reference/react/useId).
 
 > Note
 >
@@ -245,15 +245,15 @@ With Strict Mode in React 18, React will simulate unmounting and remounting the
 
 #### useSyncExternalStore {/*usesyncexternalstore*/}
 
-`useSyncExternalStore` is a new hook that allows external stores to support concurrent reads by forcing updates to the store to be synchronous. It removes the need for useEffect when implementing subscriptions to external data sources, and is recommended for any library that integrates with state external to React. [See docs here](/reference/react/useSyncExternalStore).
+`useSyncExternalStore` is a new Hook that allows external stores to support concurrent reads by forcing updates to the store to be synchronous. It removes the need for useEffect when implementing subscriptions to external data sources, and is recommended for any library that integrates with state external to React. [See docs here](/reference/react/useSyncExternalStore).
 
 > Note
 >
 > `useSyncExternalStore` is intended to be used by libraries, not application code.
 
 #### useInsertionEffect {/*useinsertioneffect*/}
 
-`useInsertionEffect` is a new hook that allows CSS-in-JS libraries to address performance issues of injecting styles in render. Unless you’ve already built a CSS-in-JS library we don’t expect you to ever use this. This hook will run after the DOM is mutated, but before layout effects read the new layout. This solves an issue that already exists in React 17 and below, but is even more important in React 18 because React yields to the browser during concurrent rendering, giving it a chance to recalculate layout. [See docs here](/reference/react/useInsertionEffect).
+`useInsertionEffect` is a new Hook that allows CSS-in-JS libraries to address performance issues of injecting styles in render. Unless you’ve already built a CSS-in-JS library we don’t expect you to ever use this. This Hook will run after the DOM is mutated, but before layout effects read the new layout. This solves an issue that already exists in React 17 and below, but is even more important in React 18 because React yields to the browser during concurrent rendering, giving it a chance to recalculate layout. [See docs here](/reference/react/useInsertionEffect).
 
 > Note
 >
@@ -339,4 +339,3 @@ See [How to Upgrade to React 18](/blog/2022/03/08/react-18-upgrade-guide) for st
 * Update webpack plugin for webpack 5 ([#22739](https://github.com/facebook/react/pull/22739)  by [@michenly](https://github.com/michenly))
 * Fix a mistake in the Node loader. ([#22537](https://github.com/facebook/react/pull/22537)  by [@btea](https://github.com/btea))
 * Use `globalThis` instead of `window` for edge environments. ([#22777](https://github.com/facebook/react/pull/22777)  by [@huozhi](https://github.com/huozhi))
-

src/content/blog/2022/06/15/react-labs-what-we-have-been-working-on-june-2022.md

@@ -28,7 +28,7 @@ We’re working together with Vercel and Shopify to unify bundler support for sh
 
 ## Asset Loading {/*asset-loading*/}
 
-Currently, assets like scripts, external styles, fonts, and images are typically preloaded and loaded using external systems. This can make it tricky to coordinate across new environments like streaming, server components, and more.
+Currently, assets like scripts, external styles, fonts, and images are typically preloaded and loaded using external systems. This can make it tricky to coordinate across new environments like streaming, Server Components, and more.
 We’re looking at adding APIs to preload and load deduplicated external assets through React APIs that work in all React environments.
 
 We’re also looking at having these support Suspense so you can have images, CSS, and fonts that block display until they’re loaded but don’t block streaming and concurrent rendering. This can help avoid [“popcorning“](https://twitter.com/sebmarkbage/status/1516852731251724293) as the visuals pop and layout shifts.
@@ -41,7 +41,7 @@ Static Site Generation (SSG) and Incremental Static Regeneration (ISR) are great
 
 We gave an [early preview](https://www.youtube.com/watch?v=lGEMwh32soc) of React Forget at React Conf 2021. It’s a compiler that automatically generates the equivalent of `useMemo` and `useCallback` calls to minimize the cost of re-rendering, while retaining React’s programming model.
 
-Recently, we finished a rewrite of the compiler to make it more reliable and capable. This new architecture allows us to analyze and memoize more complex patterns such as the use of [local mutations](/learn/keeping-components-pure#local-mutation-your-components-little-secret), and opens up many new compile-time optimization opportunities beyond just being on par with memoization hooks.
+Recently, we finished a rewrite of the compiler to make it more reliable and capable. This new architecture allows us to analyze and memoize more complex patterns such as the use of [local mutations](/learn/keeping-components-pure#local-mutation-your-components-little-secret), and opens up many new compile-time optimization opportunities beyond just being on par with memoization Hooks.
 
 We’re also working on a playground for exploring many aspects of the compiler. While the goal of the playground is to make development of the compiler easier, we think that it will make it easier to try it out and build intuition for what the compiler does. It reveals various insights into how it works under the hood, and live renders the compiler’s outputs as you type. This will be shipped together with the compiler when it’s released.
 

src/content/blog/2023/03/22/react-labs-what-we-have-been-working-on-march-2023.md

@@ -24,7 +24,7 @@ RSC combines the simple "request/response" mental model of server-centric Multi-
 
 Since our last update, we have merged the [React Server Components RFC](https://github.com/reactjs/rfcs/blob/main/text/0188-server-components.md) to ratify the proposal. We resolved outstanding issues with the [React Server Module Conventions](https://github.com/reactjs/rfcs/blob/main/text/0227-server-module-conventions.md) proposal, and reached consensus with our partners to go with the `"use client"` convention. These documents also act as specification for what an RSC-compatible implementation should support.
 
-The biggest change is that we introduced [`async` / `await`](https://github.com/reactjs/rfcs/pull/229) as the primary way to do data fetching from Server Components. We also plan to support data loading from the client by introducing a new hook called `use` that unwraps Promises. Although we can't support `async / await` in arbitrary components in client-only apps, we plan to add support for it when you structure your client-only app similar to how RSC apps are structured.
+The biggest change is that we introduced [`async` / `await`](https://github.com/reactjs/rfcs/pull/229) as the primary way to do data fetching from Server Components. We also plan to support data loading from the client by introducing a new Hook called `use` that unwraps Promises. Although we can't support `async / await` in arbitrary components in client-only apps, we plan to add support for it when you structure your client-only app similar to how RSC apps are structured.
 
 Now that we have data fetching pretty well sorted, we're exploring the other direction: sending data from the client to the server, so that you can execute database mutations and implement forms. We're doing this by letting you pass Server Action functions across the server/client boundary, which the client can then call, providing seamless RPC. Server Actions also give you progressively enhanced forms before JavaScript loads.
 
@@ -74,7 +74,7 @@ Making plain JavaScript in React components reactive requires a compiler with a
 
 ## Offscreen Rendering {/*offscreen-rendering*/}
 
-Offscreen rendering is an upcoming capability in React for rendering screens in the background without additional performance overhead. You can think of it as a version of the [`content-visiblity` CSS property](https://developer.mozilla.org/en-US/docs/Web/CSS/content-visibility) that works not only for DOM elements but React components, too. During our research, we've discovered a variety of use cases:
+Offscreen rendering is an upcoming capability in React for rendering screens in the background without additional performance overhead. You can think of it as a version of the [`content-visibility` CSS property](https://developer.mozilla.org/en-US/docs/Web/CSS/content-visibility) that works not only for DOM elements but React components, too. During our research, we've discovered a variety of use cases:
 
 - A router can prerender screens in the background so that when a user navigates to them, they're instantly available.
 - A tab switching component can preserve the state of hidden tabs, so the user can switch between them without losing their progress.