diff --git a/.github/workflows/analyze.yml b/.github/workflows/analyze.yml index 87dcfdc73..b1ef428d0 100644 --- a/.github/workflows/analyze.yml +++ b/.github/workflows/analyze.yml @@ -11,18 +11,26 @@ jobs: analyze: runs-on: ubuntu-latest steps: - - uses: actions/checkout@v2 + - uses: actions/checkout@v4 - name: Set up node - uses: actions/setup-node@v1 + uses: actions/setup-node@v4 with: node-version: '20.x' + cache: yarn + cache-dependency-path: yarn.lock - - name: Install dependencies - uses: bahmutov/npm-install@v1.7.10 + - name: Restore cached node_modules + uses: actions/cache@v4 + with: + path: "**/node_modules" + key: node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }} + + - name: Install deps + run: yarn install --frozen-lockfile - name: Restore next build - uses: actions/cache@v2 + uses: actions/cache@v4 id: restore-build-cache env: cache-name: cache-next-build @@ -41,7 +49,7 @@ jobs: run: npx -p nextjs-bundle-analysis@0.5.0 report - name: Upload bundle - uses: actions/upload-artifact@v2 + uses: actions/upload-artifact@v4 with: path: .next/analyze/__bundle_analysis.json name: bundle_analysis.json @@ -73,7 +81,7 @@ jobs: run: ls -laR .next/analyze/base && npx -p nextjs-bundle-analysis compare - name: Upload analysis comment - uses: actions/upload-artifact@v2 + uses: actions/upload-artifact@v4 with: name: analysis_comment.txt path: .next/analyze/__bundle_analysis_comment.txt @@ -82,7 +90,7 @@ jobs: run: echo ${{ github.event.number }} > ./pr_number - name: Upload PR number - uses: actions/upload-artifact@v2 + uses: actions/upload-artifact@v4 with: name: pr_number path: ./pr_number diff --git a/.github/workflows/site_lint.yml b/.github/workflows/site_lint.yml index 34ca6d7b8..36f7642c9 100644 --- a/.github/workflows/site_lint.yml +++ b/.github/workflows/site_lint.yml @@ -14,14 +14,22 @@ jobs: name: Lint on node 20.x and ubuntu-latest steps: - - uses: actions/checkout@v1 + - uses: actions/checkout@v4 - name: Use Node.js 20.x - uses: actions/setup-node@v3 + uses: actions/setup-node@v4 with: node-version: 20.x + cache: yarn + cache-dependency-path: yarn.lock - - name: Install deps and build (with cache) - uses: bahmutov/npm-install@v1.8.32 + - name: Restore cached node_modules + uses: actions/cache@v4 + with: + path: "**/node_modules" + key: node_modules-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('yarn.lock') }} + + - name: Install deps + run: yarn install --frozen-lockfile - name: Lint codebase run: yarn ci-check diff --git a/package.json b/package.json index 1f63eb121..ad9b9baa4 100644 --- a/package.json +++ b/package.json @@ -24,8 +24,8 @@ }, "dependencies": { "@codesandbox/sandpack-react": "2.13.5", - "@docsearch/css": "3.0.0-alpha.41", - "@docsearch/react": "3.0.0-alpha.41", + "@docsearch/css": "^3.6.1", + "@docsearch/react": "^3.6.1", "@headlessui/react": "^1.7.0", "@radix-ui/react-context-menu": "^2.1.5", "body-scroll-lock": "^3.1.3", diff --git a/public/.well-known/atproto-did b/public/.well-known/atproto-did new file mode 100644 index 000000000..ad8b0a36b --- /dev/null +++ b/public/.well-known/atproto-did @@ -0,0 +1 @@ +did:plc:uorpbnp2q32vuvyeruwauyhe \ No newline at end of file diff --git a/public/images/docs/diagrams/prerender.dark.png b/public/images/docs/diagrams/prerender.dark.png new file mode 100644 index 000000000..1e7d67e13 Binary files /dev/null and b/public/images/docs/diagrams/prerender.dark.png differ diff --git a/public/images/docs/diagrams/prerender.png b/public/images/docs/diagrams/prerender.png new file mode 100644 index 000000000..ababa5493 Binary files /dev/null and b/public/images/docs/diagrams/prerender.png differ diff --git a/public/images/docs/diagrams/prewarm.dark.png b/public/images/docs/diagrams/prewarm.dark.png new file mode 100644 index 000000000..461406039 Binary files /dev/null and b/public/images/docs/diagrams/prewarm.dark.png differ diff --git a/public/images/docs/diagrams/prewarm.png b/public/images/docs/diagrams/prewarm.png new file mode 100644 index 000000000..f6ec1c49d Binary files /dev/null and b/public/images/docs/diagrams/prewarm.png differ diff --git a/src/components/Icon/IconBsky.tsx b/src/components/Icon/IconBsky.tsx new file mode 100644 index 000000000..6645152dd --- /dev/null +++ b/src/components/Icon/IconBsky.tsx @@ -0,0 +1,24 @@ +/* + * Copyright (c) Facebook, Inc. and its affiliates. + */ + +import {memo} from 'react'; + +export const IconBsky = memo(function IconBsky( + props +) { + return ( + + + + ); +}); diff --git a/src/components/Layout/Footer.tsx b/src/components/Layout/Footer.tsx index c2b8e5e79..a8309825b 100644 --- a/src/components/Layout/Footer.tsx +++ b/src/components/Layout/Footer.tsx @@ -8,6 +8,7 @@ import cn from 'classnames'; import {ExternalLink} from 'components/ExternalLink'; import {IconFacebookCircle} from 'components/Icon/IconFacebookCircle'; import {IconTwitter} from 'components/Icon/IconTwitter'; +import {IconBsky} from 'components/Icon/IconBsky'; import {IconGitHub} from 'components/Icon/IconGitHub'; export function Footer() { @@ -283,7 +284,7 @@ export function Footer() {
- ©{new Date().getFullYear()} + Copyright © Meta Platforms, Inc
+ + + -
+
+
{text}
diff --git a/src/components/MDX/Sandpack/Preview.tsx b/src/components/MDX/Sandpack/Preview.tsx index 9669e5f4f..7d7cdc5a7 100644 --- a/src/components/MDX/Sandpack/Preview.tsx +++ b/src/components/MDX/Sandpack/Preview.tsx @@ -113,7 +113,7 @@ export function Preview({ /** * The spinner component transition might be longer than * the bundler loading, so we only show the spinner if - * it takes more than 1s to load the bundler. + * it takes more than 500s to load the bundler. */ timeout = setTimeout(() => { setShowLoading(true); diff --git a/src/components/MDX/TeamMember.tsx b/src/components/MDX/TeamMember.tsx index eaf74187e..e1b9198d8 100644 --- a/src/components/MDX/TeamMember.tsx +++ b/src/components/MDX/TeamMember.tsx @@ -6,6 +6,7 @@ import * as React from 'react'; import Image from 'next/image'; import {IconTwitter} from '../Icon/IconTwitter'; import {IconThreads} from '../Icon/IconThreads'; +import {IconBsky} from '../Icon/IconBsky'; import {IconGitHub} from '../Icon/IconGitHub'; import {ExternalLink} from '../ExternalLink'; import {H3} from './Heading'; @@ -19,6 +20,7 @@ interface TeamMemberProps { photo: string; twitter?: string; threads?: string; + bsky?: string; github?: string; personal?: string; } @@ -33,6 +35,7 @@ export function TeamMember({ github, twitter, threads, + bsky, personal, }: TeamMemberProps) { if (name == null || title == null || permalink == null || children == null) { @@ -62,11 +65,11 @@ export function TeamMember({ {title &&
{title}
} {children} -
+
{twitter && (
@@ -77,7 +80,7 @@ export function TeamMember({ {threads && (
@@ -85,6 +88,17 @@ export function TeamMember({
)} + {bsky && ( +
+ + + {bsky} + +
+ )} {github && (
- {name} {isPacked && '✔'} + {name} {isPacked && '✅'} ); } @@ -307,7 +307,7 @@ export default function PackingList() { function Item({ name, isPacked }) { return (
  • - {name} {isPacked ? '✔' : '❌'} + {name} {isPacked ? '✅' : '❌'}
    • ); } diff --git a/src/content/blog/2024/04/25/react-19-upgrade-guide.md b/src/content/blog/2024/04/25/react-19-upgrade-guide.md index f464df959..e6d76ec7b 100644 --- a/src/content/blog/2024/04/25/react-19-upgrade-guide.md +++ b/src/content/blog/2024/04/25/react-19-upgrade-guide.md @@ -353,7 +353,7 @@ npm install react-shallow-renderer --save-dev ##### Please reconsider shallow rendering {/*please-reconsider-shallow-rendering*/} -Shallow rendering depends on React internals and can block you from future upgrades. We recommend migrating your tests to [@testing-library/react](https://testing-library.com/docs/react-testing-library/intro/) or [@testing-library/react-native](https://callstack.github.io/react-native-testing-library/docs/getting-started). +Shallow rendering depends on React internals and can block you from future upgrades. We recommend migrating your tests to [@testing-library/react](https://testing-library.com/docs/react-testing-library/intro/) or [@testing-library/react-native](https://testing-library.com/docs/react-native-testing-library/intro). @@ -524,7 +524,7 @@ We are deprecating `react-test-renderer` because it implements its own renderer The test renderer was created before there were more viable testing strategies available like [React Testing Library](https://testing-library.com), and we now recommend using a modern testing library instead. -In React 19, `react-test-renderer` logs a deprecation warning, and has switched to concurrent rendering. We recommend migrating your tests to [@testing-library/react](https://testing-library.com/docs/react-testing-library/intro/) or [@testing-library/react-native](https://callstack.github.io/react-native-testing-library/docs/getting-started) for a modern and well supported testing experience. +In React 19, `react-test-renderer` logs a deprecation warning, and has switched to concurrent rendering. We recommend migrating your tests to [@testing-library/react](https://testing-library.com/docs/react-testing-library/intro/) or [@testing-library/react-native](https://testing-library.com/docs/react-native-testing-library/intro) for a modern and well supported testing experience. ## Notable changes {/*notable-changes*/} @@ -536,6 +536,24 @@ When double rendering in Strict Mode in development, `useMemo` and `useCallback` As with all Strict Mode behaviors, these features are designed to proactively surface bugs in your components during development so you can fix them before they are shipped to production. For example, during development, Strict Mode will double-invoke ref callback functions on initial mount, to simulate what happens when a mounted component is replaced by a Suspense fallback. +### Improvements to Suspense {/*improvements-to-suspense*/} + +In React 19, when a component suspends, React will immediately commit the fallback of the nearest Suspense boundary without waiting for the entire sibling tree to render. After the fallback commits, React schedules another render for the suspended siblings to "pre-warm" lazy requests in the rest of the tree: + + + +Previously, when a component suspended, the suspended siblings were rendered and then the fallback was committed. + + + + + +In React 19, when a component suspends, the fallback is committed and then the suspended siblings are rendered. + + + +This change means Suspense fallbacks display faster, while still warming lazy requests in the suspended tree. + ### UMD builds removed {/*umd-builds-removed*/} UMD was widely used in the past as a convenient way to load React without a build step. Now, there are modern alternatives for loading modules as scripts in HTML documents. Starting with React 19, React will no longer produce UMD builds to reduce the complexity of its testing and release process. diff --git a/src/content/blog/2024/10/21/react-compiler-beta-release.md b/src/content/blog/2024/10/21/react-compiler-beta-release.md new file mode 100644 index 000000000..f5a870b22 --- /dev/null +++ b/src/content/blog/2024/10/21/react-compiler-beta-release.md @@ -0,0 +1,126 @@ +--- +title: "React Compiler Beta Release" +author: Lauren Tan +date: 2024/10/21 +description: At React Conf 2024, we announced the experimental release of React Compiler, a build-time tool that optimizes your React app through automatic memoization. In this post, we want to share what's next for open source, and our progress on the compiler. + +--- + +October 21, 2024 by [Lauren Tan](https://twitter.com/potetotes). + +--- + + + +The React team is excited to share new updates: + + + +1. We're publishing React Compiler Beta today, so that early adopters and library maintainers can try it and provide feedback. +2. We're officially supporting React Compiler for apps on React 17+, through an optional `react-compiler-runtime` package. +3. We're opening up public membership of the [React Compiler Working Group](https://github.com/reactwg/react-compiler) to prepare the community for gradual adoption of the compiler. + +--- + +At [React Conf 2024](/blog/2024/05/22/react-conf-2024-recap), we announced the experimental release of React Compiler, a build-time tool that optimizes your React app through automatic memoization. [You can find an introduction to React Compiler here](/learn/react-compiler). + +Since the first release, we've fixed numerous bugs reported by the React community, received several high quality bug fixes and contributions[^1] to the compiler, made the compiler more resilient to the broad diversity of JavaScript patterns, and have continued to roll out the compiler more widely at Meta. + +In this post, we want to share what's next for React Compiler. + +## Try React Compiler Beta today {/*try-react-compiler-beta-today*/} + +At [React India 2024](https://www.youtube.com/watch?v=qd5yk2gxbtg), we shared an update on React Compiler. Today, we are excited to announce a new Beta release of React Compiler and ESLint plugin. New betas are published to npm using the `@beta` tag. + +To install React Compiler Beta: + + +npm install -D babel-plugin-react-compiler@beta eslint-plugin-react-compiler@beta + + +Or, if you're using Yarn: + + +yarn add -D babel-plugin-react-compiler@beta eslint-plugin-react-compiler@beta + + +You can watch [Sathya Gunasekaran's](https://twitter.com/_gsathya) talk at React India here: + + + +## We recommend everyone use the React Compiler linter today {/*we-recommend-everyone-use-the-react-compiler-linter-today*/} + +React Compiler’s ESLint plugin helps developers proactively identify and correct [Rules of React](/reference/rules) violations. **We strongly recommend everyone use the linter today**. The linter does not require that you have the compiler installed, so you can use it independently, even if you are not ready to try out the compiler. + +To install the linter only: + + +npm install -D eslint-plugin-react-compiler@beta + + +Or, if you're using Yarn: + + +yarn add -D eslint-plugin-react-compiler@beta + + +After installation you can enable the linter by [adding it to your ESLint config](/learn/react-compiler#installing-eslint-plugin-react-compiler). Using the linter helps identify Rules of React breakages, making it easier to adopt the compiler when it's fully released. + +## Backwards Compatibility {/*backwards-compatibility*/} + +React Compiler produces code that depends on runtime APIs added in React 19, but we've since added support for the compiler to also work with React 17 and 18. If you are not on React 19 yet, in the Beta release you can now try out React Compiler by specifying a minimum `target` in your compiler config, and adding `react-compiler-runtime` as a dependency. [You can find docs on this here](/learn/react-compiler#using-react-compiler-with-react-17-or-18). + +## Using React Compiler in libraries {/*using-react-compiler-in-libraries*/} + +Our initial release was focused on identifying major issues with using the compiler in applications. We've gotten great feedback and have substantially improved the compiler since then. We're now ready for broad feedback from the community, and for library authors to try out the compiler to improve performance and the developer experience of maintaining your library. + +React Compiler can also be used to compile libraries. Because React Compiler needs to run on the original source code prior to any code transformations, it is not possible for an application's build pipeline to compile the libraries they use. Hence, our recommendation is for library maintainers to independently compile and test their libraries with the compiler, and ship compiled code to npm. + +Because your code is pre-compiled, users of your library will not need to have the compiler enabled in order to benefit from the automatic memoization applied to your library. If your library targets apps not yet on React 19, specify a minimum `target` and add `react-compiler-runtime` as a direct dependency. The runtime package will use the correct implementation of APIs depending on the application's version, and polyfill the missing APIs if necessary. + +[You can find more docs on this here.](/learn/react-compiler#using-the-compiler-on-libraries) + +## Opening up React Compiler Working Group to everyone {/*opening-up-react-compiler-working-group-to-everyone*/} + +We previously announced the invite-only [React Compiler Working Group](https://github.com/reactwg/react-compiler) at React Conf to provide feedback, ask questions, and collaborate on the compiler's experimental release. + +From today, together with the Beta release of React Compiler, we are opening up Working Group membership to everyone. The goal of the React Compiler Working Group is to prepare the ecosystem for a smooth, gradual adoption of React Compiler by existing applications and libraries. Please continue to file bug reports in the [React repo](https://github.com/facebook/react), but please leave feedback, ask questions, or share ideas in the [Working Group discussion forum](https://github.com/reactwg/react-compiler/discussions). + +The core team will also use the discussions repo to share our research findings. As the Stable Release gets closer, any important information will also be posted on this forum. + +## React Compiler at Meta {/*react-compiler-at-meta*/} + +At [React Conf](/blog/2024/05/22/react-conf-2024-recap), we shared that our rollout of the compiler on Quest Store and Instagram were successful. Since then, we've deployed React Compiler across several more major web apps at Meta, including [Facebook](https://www.facebook.com) and [Threads](https://www.threads.net). That means if you've used any of these apps recently, you may have had your experience powered by the compiler. We were able to onboard these apps onto the compiler with few code changes required, in a monorepo with more than 100,000 React components. + +We've seen notable performance improvements across all of these apps. As we've rolled out, we're continuing to see results on the order of [the wins we shared previously at ReactConf](https://youtu.be/lyEKhv8-3n0?t=3223). These apps have already been heavily hand tuned and optimized by Meta engineers and React experts over the years, so even improvements on the order of a few percent are a huge win for us. + +We also expected developer productivity wins from React Compiler. To measure this, we collaborated with our data science partners at Meta[^2] to conduct a thorough statistical analysis of the impact of manual memoization on productivity. Before rolling out the compiler at Meta, we discovered that only about 8% of React pull requests used manual memoization and that these pull requests took 31-46% longer to author[^3]. This confirmed our intuition that manual memoization introduces cognitive overhead, and we anticipate that React Compiler will lead to more efficient code authoring and review. Notably, React Compiler also ensures that *all* code is memoized by default, not just the (in our case) 8% where developers explicitly apply memoization. + +## Roadmap to Stable {/*roadmap-to-stable*/} + +*This is not a final roadmap, and is subject to change.* + +We intend to ship a Release Candidate of the compiler in the near future following the Beta release, when the majority of apps and libraries that follow the Rules of React have been proven to work well with the compiler. After a period of final feedback from the community, we plan on a Stable Release for the compiler. The Stable Release will mark the beginning of a new foundation for React, and all apps and libraries will be strongly recommended to use the compiler and ESLint plugin. + +* ✅ Experimental: Released at React Conf 2024, primarily for feedback from early adopters. +* ✅ Public Beta: Available today, for feedback from the wider community. +* 🚧 Release Candidate (RC): React Compiler works for the majority of rule-following apps and libraries without issue. +* 🚧 General Availability: After final feedback period from the community. + +These releases also include the compiler's ESLint plugin, which surfaces diagnostics statically analyzed by the compiler. We plan to combine the existing eslint-plugin-react-hooks plugin with the compiler's ESLint plugin, so only one plugin needs to be installed. + +Post-Stable, we plan to add more compiler optimizations and improvements. This includes both continual improvements to automatic memoization, and new optimizations altogether, with minimal to no change of product code. Upgrading to each new release of the compiler is aimed to be straightforward, and each upgrade will continue to improve performance and add better handling of diverse JavaScript and React patterns. + +Throughout this process, we also plan to prototype an IDE extension for React. It is still very early in research, so we expect to be able to share more of our findings with you in a future React Labs blog post. + +--- + +Thanks to [Sathya Gunasekaran](https://twitter.com/_gsathya), [Joe Savona](https://twitter.com/en_JS), [Ricky Hanlon](https://twitter.com/rickhanlonii), [Alex Taylor](https://github.com/alexmckenley), [Jason Bonta](https://twitter.com/someextent), and [Eli White](https://twitter.com/Eli_White) for reviewing and editing this post. + +--- + +[^1]: Thanks [@nikeee](https://github.com/facebook/react/pulls?q=is%3Apr+author%3Anikeee), [@henryqdineen](https://github.com/facebook/react/pulls?q=is%3Apr+author%3Ahenryqdineen), [@TrickyPi](https://github.com/facebook/react/pulls?q=is%3Apr+author%3ATrickyPi), and several others for their contributions to the compiler. + +[^2]: Thanks [Vaishali Garg](https://www.linkedin.com/in/vaishaligarg09) for leading this study on React Compiler at Meta, and for reviewing this post. + +[^3]: After controlling on author tenure, diff length/complexity, and other potential confounding factors. \ No newline at end of file diff --git a/src/content/blog/index.md b/src/content/blog/index.md index 4a1a165a3..e37631e80 100644 --- a/src/content/blog/index.md +++ b/src/content/blog/index.md @@ -10,6 +10,12 @@ This blog is the official source for the updates from the React team. Anything i
    + + +We announced an experimental release of React Compiler at React Conf 2024. We've made a lot of progress since then, and in this post we want to share what's next for React Compiler ... + + + Last week we hosted React Conf 2024, a two-day conference in Henderson, Nevada where 700+ attendees gathered in-person to discuss the latest in UI engineering. This was our first in-person conference since 2019, and we were thrilled to be able to bring the community together again ... diff --git a/src/content/community/acknowledgements.md b/src/content/community/acknowledgements.md index aeb0787ef..760076d83 100644 --- a/src/content/community/acknowledgements.md +++ b/src/content/community/acknowledgements.md @@ -4,7 +4,7 @@ title: Acknowledgements -React was originally created by [Jordan Walke.](https://github.com/jordwalke) Today, React has a [dedicated full-time team working on it](/community/team), as well as over a thousand [open source contributors.](https://github.com/facebook/react/blob/main/AUTHORS) +React was originally created by [Jordan Walke.](https://github.com/jordwalke) Today, React has a [dedicated full-time team working on it](/community/team), as well as over a thousand [open source contributors.](https://github.com/facebook/react/graphs/contributors) @@ -59,7 +59,7 @@ We'd like to recognize a few people who have made significant contributions to R This list is not exhaustive. -We'd like to give special thanks to [Tom Occhino](https://github.com/tomocchino) and [Adam Wolff](https://github.com/wolffiex) for their guidance and support over the years. We are also thankful to all the volunteers who [translated React into other languages.](https://translations.reactjs.org/) +We'd like to give special thanks to [Tom Occhino](https://github.com/tomocchino) and [Adam Wolff](https://github.com/wolffiex) for their guidance and support over the years. We are also thankful to all the volunteers who [translated React into other languages.](https://translations.react.dev/) ## Additional Thanks {/*additional-thanks*/} diff --git a/src/content/community/conferences.md b/src/content/community/conferences.md index 5070fbc41..aaa761218 100644 --- a/src/content/community/conferences.md +++ b/src/content/community/conferences.md @@ -10,26 +10,6 @@ Do you know of a local React.js conference? Add it here! (Please keep the list c ## Upcoming Conferences {/*upcoming-conferences*/} -### React Nexus 2024 {/*react-nexus-2024*/} -July 04 & 05, 2024. Bangalore, India (In-person event) - -[Website](https://reactnexus.com/) - [Twitter](https://twitter.com/ReactNexus) - [Linkedin](https://www.linkedin.com/company/react-nexus) - [YouTube](https://www.youtube.com/reactify_in) - -### Chain React 2024 {/*chain-react-2024*/} -July 17-19, 2024. In-person in Portland, OR, USA - -[Website](https://chainreactconf.com) - [Twitter](https://twitter.com/ChainReactConf) - -### The Geek Conf 2024 {/*the-geek-conf-2024*/} -July 25, 2024. In-person in Berlin, Germany + remote (hybrid event) - -[Website](https://thegeekconf.com) - [Twitter](https://twitter.com/thegeekconf) - -### React Rally 2024 🐙 {/*react-rally-2024*/} -August 12-13, 2024. Park City, UT, USA - -[Website](https://reactrally.com) - [Twitter](https://twitter.com/ReactRally) - [YouTube](https://www.youtube.com/channel/UCXBhQ05nu3L1abBUGeQ0ahw) - ### React Universe Conf 2024 {/*react-universe-conf-2024*/} September 5-6, 2024. Wrocław, Poland. @@ -55,13 +35,58 @@ October 18, 2024. In-person in Brussels, Belgium (hybrid event) [Website](https://www.react.brussels/) - [Twitter](https://x.com/BrusselsReact) +### reactjsday 2024 {/*reactjsday-2024*/} +October 25, 2024. In-person in Verona, Italy + online (hybrid event) + +[Website](https://2024.reactjsday.it/) - [Twitter](https://x.com/reactjsday) - [Facebook](https://www.facebook.com/GrUSP/) - [YouTube](https://www.youtube.com/c/grusp) + +### React Advanced London 2024 {/*react-advanced-london-2024*/} +October 25 & 28, 2024. In-person in London, UK + online (hybrid event) + +[Website](https://reactadvanced.com/) - [Twitter](https://x.com/reactadvanced) + +### React Native London Conf 2024 {/*react-native-london-2024*/} +November 14 & 15, 2024. In-person in London, UK + +[Website](https://reactnativelondon.co.uk/) - [Twitter](https://x.com/RNLConf) + +### React Summit US 2024 {/*react-summit-us-2024*/} +November 19 & 22, 2024. In-person in New York, USA + online (hybrid event) + +[Website](https://reactsummit.us/) - [Twitter](https://twitter.com/reactsummit) - [Videos](https://portal.gitnation.org/) + ### React Africa 2024 {/*react-africa-2024*/} November 29, 2024. In-person in Casablanca, Morocco (hybrid event) [Website](https://react-africa.com/) - [Twitter](https://x.com/BeJS_) +### React Day Berlin 2024 {/*react-day-berlin-2024*/} +December 13 & 16, 2024. In-person in Berlin, Germany + remote (hybrid event) + +[Website](https://reactday.berlin/) - [Twitter](https://x.com/reactdayberlin) + ## Past Conferences {/*past-conferences*/} +### React Rally 2024 🐙 {/*react-rally-2024*/} +August 12-13, 2024. Park City, UT, USA + +[Website](https://reactrally.com) - [Twitter](https://twitter.com/ReactRally) - [YouTube](https://www.youtube.com/channel/UCXBhQ05nu3L1abBUGeQ0ahw) + +### The Geek Conf 2024 {/*the-geek-conf-2024*/} +July 25, 2024. In-person in Berlin, Germany + remote (hybrid event) + +[Website](https://thegeekconf.com) - [Twitter](https://twitter.com/thegeekconf) + +### Chain React 2024 {/*chain-react-2024*/} +July 17-19, 2024. In-person in Portland, OR, USA + +[Website](https://chainreactconf.com) - [Twitter](https://twitter.com/ChainReactConf) + +### React Nexus 2024 {/*react-nexus-2024*/} +July 04 & 05, 2024. Bangalore, India (In-person event) + +[Website](https://reactnexus.com/) - [Twitter](https://twitter.com/ReactNexus) - [Linkedin](https://www.linkedin.com/company/react-nexus) - [YouTube](https://www.youtube.com/reactify_in) + ### React Summit 2024 {/*react-summit-2024*/} June 14 & 18, 2024. In-person in Amsterdam, Netherlands + remote (hybrid event) diff --git a/src/content/community/meetups.md b/src/content/community/meetups.md index d8887c3de..14097aa4d 100644 --- a/src/content/community/meetups.md +++ b/src/content/community/meetups.md @@ -30,15 +30,8 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet * [Belo Horizonte](https://www.meetup.com/reactbh/) * [Curitiba](https://www.meetup.com/pt-br/ReactJS-CWB/) * [Florianópolis](https://www.meetup.com/pt-br/ReactJS-Floripa/) -* [Goiânia](https://www.meetup.com/pt-br/React-Goiania/) * [Joinville](https://www.meetup.com/pt-BR/React-Joinville/) -* [Juiz de Fora](https://www.meetup.com/pt-br/React-Juiz-de-Fora/) -* [Maringá](https://www.meetup.com/pt-BR/React-Maringa/) -* [Porto Alegre](https://www.meetup.com/pt-BR/React-Porto-Alegre/) -* [Rio de Janeiro](https://www.meetup.com/pt-BR/React-Rio-de-Janeiro/) -* [Salvador](https://www.meetup.com/pt-BR/ReactSSA) * [São Paulo](https://www.meetup.com/pt-BR/ReactJS-SP/) -* [Vila Velha](https://www.meetup.com/pt-BR/React-ES/) ## Bolivia {/*bolivia*/} * [Bolivia](https://www.meetup.com/ReactBolivia/) @@ -51,24 +44,13 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet * [Saskatoon, SK](https://www.meetup.com/saskatoon-react-meetup/) * [Toronto, ON](https://www.meetup.com/Toronto-React-Native/events/) -## Chile {/*chile*/} -* [Santiago](https://www.meetup.com/es-ES/react-santiago/) - -## China {/*china*/} -* [Beijing](https://www.meetup.com/Beijing-ReactJS-Meetup/) - ## Colombia {/*colombia*/} -* [Bogotá](https://www.meetup.com/meetup-group-iHIeHykY/) * [Medellin](https://www.meetup.com/React-Medellin/) -* [Cali](https://www.meetup.com/reactcali/) ## Denmark {/*denmark*/} * [Aalborg](https://www.meetup.com/Aalborg-React-React-Native-Meetup/) * [Aarhus](https://www.meetup.com/Aarhus-ReactJS-Meetup/) -## Egypt {/*egypt*/} -* [Cairo](https://www.meetup.com/react-cairo/) - ## England (UK) {/*england-uk*/} * [Manchester](https://www.meetup.com/Manchester-React-User-Group/) * [React.JS Girls London](https://www.meetup.com/ReactJS-Girls-London/) @@ -76,7 +58,6 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet * [React Native London](https://guild.host/RNLDN) ## France {/*france*/} -* [Nantes](https://www.meetup.com/React-Nantes/) * [Lille](https://www.meetup.com/ReactBeerLille/) * [Paris](https://www.meetup.com/ReactJS-Paris/) @@ -93,9 +74,6 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet * [Athens](https://www.meetup.com/React-To-React-Athens-MeetUp/) * [Thessaloniki](https://www.meetup.com/Thessaloniki-ReactJS-Meetup/) -## Hungary {/*hungary*/} -* [Budapest](https://www.meetup.com/React-Budapest/) - ## India {/*india*/} * [Ahmedabad](https://www.meetup.com/react-ahmedabad/) * [Bangalore (React)](https://www.meetup.com/ReactJS-Bangalore/) @@ -117,6 +95,9 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet ## Italy {/*italy*/} * [Milan](https://www.meetup.com/React-JS-Milano/) +## Japan {/*japan*/} +* [Osaka](https://react-osaka.connpass.com/) + ## Kenya {/*kenya*/} * [Nairobi - Reactdevske](https://kommunity.com/reactjs-developer-community-kenya-reactdevske) @@ -138,12 +119,6 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet * [Karachi](https://www.facebook.com/groups/902678696597634/) * [Lahore](https://www.facebook.com/groups/ReactjsLahore/) -## Panama {/*panama*/} -* [Panama](https://www.meetup.com/React-Panama/) - -## Peru {/*peru*/} -* [Lima](https://www.meetup.com/ReactJS-Peru/) - ## Philippines {/*philippines*/} * [Manila](https://www.meetup.com/reactjs-developers-manila/) * [Manila - ReactJS PH](https://www.meetup.com/ReactJS-Philippines/) @@ -160,7 +135,6 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet ## Spain {/*spain*/} * [Barcelona](https://www.meetup.com/ReactJS-Barcelona/) -* [Canarias](https://www.meetup.com/React-Canarias/) ## Sweden {/*sweden*/} * [Goteborg](https://www.meetup.com/ReactJS-Goteborg/) @@ -176,7 +150,6 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet * [Kyiv](https://www.meetup.com/Kyiv-ReactJS-Meetup) ## US {/*us*/} -* [Ann Arbor, MI - ReactJS](https://www.meetup.com/AnnArbor-jsx/) * [Atlanta, GA - ReactJS](https://www.meetup.com/React-ATL/) * [Austin, TX - ReactJS](https://www.meetup.com/ReactJS-Austin-Meetup/) * [Boston, MA - ReactJS](https://www.meetup.com/ReactJS-Boston/) @@ -187,7 +160,6 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet * [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/) -* [Dallas, TX - [Remote] React JS](https://www.meetup.com/React-JS-Group/) * [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/) @@ -197,27 +169,19 @@ Do you have a local React.js meetup? Add it here! (Please keep the list alphabet * [Los Angeles, CA - ReactJS](https://www.meetup.com/socal-react/) * [Los Angeles, CA - React Native](https://www.meetup.com/React-Native-Los-Angeles/) * [Miami, FL - ReactJS](https://www.meetup.com/React-Miami/) -* [Nashville, TN - ReactJS](https://www.meetup.com/NashReact-Meetup/) * [New York, NY - ReactJS](https://www.meetup.com/NYC-Javascript-React-Group/) * [New York, NY - React Ladies](https://www.meetup.com/React-Ladies/) * [New York, NY - React Native](https://www.meetup.com/React-Native-NYC/) * [New York, NY - useReactNYC](https://www.meetup.com/useReactNYC/) * [New York, NY - React.NYC](https://guild.host/react-nyc) -* [Omaha, NE - ReactJS/React Native](https://www.meetup.com/omaha-react-meetup-group/) * [Palo Alto, CA - React Native](https://www.meetup.com/React-Native-Silicon-Valley/) -* [Philadelphia, PA - ReactJS](https://www.meetup.com/Reactadelphia/) * [Phoenix, AZ - ReactJS](https://www.meetup.com/ReactJS-Phoenix/) -* [Pittsburgh, PA - ReactJS/React Native](https://www.meetup.com/ReactPgh/) -* [Portland, OR - ReactJS](https://www.meetup.com/Portland-ReactJS/) * [Provo, UT - ReactJS](https://www.meetup.com/ReactJS-Utah/) -* [Sacramento, CA - ReactJS](https://www.meetup.com/Sacramento-ReactJS-Meetup/) * [San Diego, CA - San Diego JS](https://www.meetup.com/sandiegojs/) * [San Francisco - Real World React](https://www.meetup.com/Real-World-React) * [San Francisco - ReactJS](https://www.meetup.com/ReactJS-San-Francisco/) * [San Francisco, CA - React Native](https://www.meetup.com/React-Native-San-Francisco/) -* [San Ramon, CA - TriValley Coders](https://www.meetup.com/trivalleycoders/) * [Santa Monica, CA - ReactJS](https://www.meetup.com/Los-Angeles-ReactJS-User-Group/) -* [Seattle, WA - React Native](https://www.meetup.com/Seattle-React-Native-Meetup/) * [Seattle, WA - ReactJS](https://www.meetup.com/seattle-react-js/) * [Tampa, FL - ReactJS](https://www.meetup.com/ReactJS-Tampa-Bay/) * [Tucson, AZ - ReactJS](https://www.meetup.com/Tucson-ReactJS-Meetup/) diff --git a/src/content/community/team.md b/src/content/community/team.md index 6004476e2..b11925407 100644 --- a/src/content/community/team.md +++ b/src/content/community/team.md @@ -18,7 +18,7 @@ Current members of the React team are listed in alphabetical order below. Andrew got started with web development by making sites with WordPress, and eventually tricked himself into doing JavaScript. His favorite pastime is karaoke. Andrew is either a Disney villain or a Disney princess, depending on the day. - + 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. @@ -38,11 +38,11 @@ Current members of the React team are listed in alphabetical order below. Joe was planning to major in math and philosophy but got into computer science after writing physics simulations in Matlab. Prior to React, he worked on Relay, RSocket.js, and the Skip programming language. While he’s not building some sort of reactive system he enjoys running, studying Japanese, and spending time with his family. - + Josh majored in Mathematics and discovered programming while in college. His first professional developer job was to program insurance rate calculations in Microsoft Excel, the paragon of Reactive Programming which must be why he now works on React. In between that time Josh has been an IC, Manager, and Executive at a few startups. outside of work he likes to push his limits with cooking. - + Lauren's programming career peaked when she first discovered the `` tag. She’s been chasing that high ever since. She studied Finance instead of CS in college, so she learned to code using Excel instead of Java. Lauren enjoys dropping cheeky memes in chat, playing video games with her partner, and petting her dog Zelda. @@ -62,7 +62,7 @@ Current members of the React team are listed in alphabetical order below. Noah’s interest in UI programming sparked during his education in music technology at NYU. At Meta, he's worked on internal tools, browsers, web performance, and is currently focused on React. Outside of work, Noah can be found tinkering with synthesizers or spending time with his cat. - + Ricky majored in theoretical math and somehow found himself on the React Native team for a couple years before joining the React team. When he's not programming you can find him snowboarding, biking, climbing, golfing, or closing GitHub issues that do not match the issue template. diff --git a/src/content/learn/conditional-rendering.md b/src/content/learn/conditional-rendering.md index 03fee9fbb..688fd200b 100644 --- a/src/content/learn/conditional-rendering.md +++ b/src/content/learn/conditional-rendering.md @@ -53,13 +53,17 @@ export default function PackingList() { +<<<<<<< HEAD Zauważ, że dla niektórych komponentów `Item` właściwość `isPacked` ustawiono na `true` zamiast `false`. Chcielibyśmy, żeby przy spakowanych przedmiotach, które mają ustawione `isPacked={true}`, wyświetlał się "ptaszek" (✔). +======= +Notice that some of the `Item` components have their `isPacked` prop set to `true` instead of `false`. You want to add a checkmark (✅) to packed items if `isPacked={true}`. +>>>>>>> 84f29eb20af17e9c154b9ad71c21af4c9171e4a2 Możesz to zapisać za pomocą [warunku `if`/`else`](https://developer.mozilla.org/pl/docs/Web/JavaScript/Reference/Statements/if...else) w ten sposób: ```js if (isPacked) { - return
  • {name} ✔
    • ; + return
  • {name} ✅
    • ; } return
  • {name}
    • ; ``` @@ -71,7 +75,7 @@ Jeśli właściwość `isPacked` jest ustawiona na `true`, ten kod **zwróci odm ```js function Item({ name, isPacked }) { if (isPacked) { - return
  • {name} ✔
    • ; + return
  • {name} ✅
    • ; } return
  • {name}
    • ; } @@ -160,7 +164,7 @@ W praktyce, zwykle komponenty nie zwracają `null`, ponieważ może to okazać s W poprzednim przykładzie nasz kod decydował, które (jeśli którekolwiek) drzewo JSX-owe zostanie zwrócone przez komponent. Być może widzisz pewne powtórzenia w wyniku renderowania: ```js -
  • {name} ✔
    • +
  • {name} ✅
    • ``` jest bardzo podobne do: @@ -174,7 +178,7 @@ Oba warunkowe rozgałęzienia zwracają `
  • ...
    • `: ```js if (isPacked) { - return
  • {name} ✔
    • ; + return
  • {name} ✅
    • ; } return
  • {name}
    • ; ``` @@ -189,7 +193,7 @@ Zamiast poniższego kodu: ```js if (isPacked) { - return
  • {name} ✔
    • ; + return
  • {name} ✅
    • ; } return
  • {name}
    • ; ``` @@ -199,12 +203,16 @@ Możesz napisać w ten sposób: ```js return (
  • - {isPacked ? name + ' ✔' : name} + {isPacked ? name + ' ✅' : name}
    • ); ``` +<<<<<<< HEAD Możesz to wyrażenie przeczytać jako: *"jeśli `isPacked` ma wartość `true`, wtedy (`?`) wyrenderuj `name + ' ✔'`, w przeciwnym razie (`:`) wyrenderuj `name`."*) +======= +You can read it as *"if `isPacked` is true, then (`?`) render `name + ' ✅'`, otherwise (`:`) render `name`"*. +>>>>>>> 84f29eb20af17e9c154b9ad71c21af4c9171e4a2 @@ -224,7 +232,7 @@ function Item({ name, isPacked }) {
  • {isPacked ? ( - {name + ' ✔'} + {name + ' ✅'} ) : ( name @@ -267,7 +275,7 @@ Kolejnym powszechnie stosowanym skrótem, z którym możesz się zetknąć, jest ```js return (
  • - {name} {isPacked && '✔'} + {name} {isPacked && '✅'}
    • ); ``` @@ -282,7 +290,7 @@ Poniżej przedstawiono przykład: function Item({ name, isPacked }) { return (
  • - {name} {isPacked && '✔'} + {name} {isPacked && '✅'}
    • ); } @@ -338,7 +346,7 @@ Użyj warunku `if`, aby przypisać ponownie wyrażenie JSX-owe do `itemContent`, ```js if (isPacked) { - itemContent = name + " ✔"; + itemContent = name + " ✅"; } ``` @@ -358,7 +366,7 @@ Ten sposób jest najbardziej rozwlekły, jednocześnie jednak najbardziej elasty function Item({ name, isPacked }) { let itemContent = name; if (isPacked) { - itemContent = name + " ✔"; + itemContent = name + " ✅"; } return (
  • @@ -402,7 +410,7 @@ function Item({ name, isPacked }) { if (isPacked) { itemContent = ( - {name + " ✔"} + {name + " ✅"} ); } @@ -465,7 +473,7 @@ Użyj operatora warunkowego (`warunek ? a : b`), aby wyświetlić ❌, jeśli `i function Item({ name, isPacked }) { return (
  • - {name} {isPacked && '✔'} + {name} {isPacked && '✅'}
    • ); } @@ -503,7 +511,7 @@ export default function PackingList() { function Item({ name, isPacked }) { return (
  • - {name} {isPacked ? '✔' : '❌'} + {name} {isPacked ? '✅' : '❌'}
    • ); } diff --git a/src/content/learn/describing-the-ui.md b/src/content/learn/describing-the-ui.md index 1c15674b7..52c3cb284 100644 --- a/src/content/learn/describing-the-ui.md +++ b/src/content/learn/describing-the-ui.md @@ -327,7 +327,7 @@ W tym przykładzie użyliśmy operatora `&&` do warunkowego wyrenderowania tzw. function Item({ name, isPacked }) { return (
  • - {name} {isPacked && '✔'} + {name} {isPacked && '✅'}
    • ); } diff --git a/src/content/learn/manipulating-the-dom-with-refs.md b/src/content/learn/manipulating-the-dom-with-refs.md index 2d44d7353..e881c8a1f 100644 --- a/src/content/learn/manipulating-the-dom-with-refs.md +++ b/src/content/learn/manipulating-the-dom-with-refs.md @@ -124,35 +124,35 @@ export default function CatFriends() { <>
    • Tom
    • Maru
    • Jellylorum
      • @@ -245,9 +245,9 @@ export default function CatFriends() { return ( <>
        @@ -948,7 +948,7 @@ const catList = []; for (let i = 0; i < 10; i++) { catList.push({ id: i, - imageUrl: 'https://placekitten.com/250/200?image=' + i + imageUrl: 'https://loremflickr.com/250/200/cat?lock=' + i }); } @@ -1065,7 +1065,7 @@ const catList = []; for (let i = 0; i < 10; i++) { catList.push({ id: i, - imageUrl: 'https://placekitten.com/250/200?image=' + i + imageUrl: 'https://loremflickr.com/250/200/cat?lock=' + i }); } diff --git a/src/content/learn/react-compiler.md b/src/content/learn/react-compiler.md index f34c382ed..5362d69e1 100644 --- a/src/content/learn/react-compiler.md +++ b/src/content/learn/react-compiler.md @@ -3,7 +3,7 @@ title: React Compiler --- -This page will give you an introduction to the new experimental React Compiler and how to try it out successfully. +This page will give you an introduction to React Compiler and how to try it out successfully. @@ -13,20 +13,34 @@ These docs are still a work in progress. More documentation is available in the * Getting started with the compiler -* Installing the compiler and eslint plugin +* Installing the compiler and ESLint plugin * Troubleshooting -React Compiler is a new experimental compiler that we've open sourced to get early feedback from the community. It still has rough edges and is not yet fully ready for production. +React Compiler is a new compiler currently in Beta, that we've open sourced to get early feedback from the community. While it has been used in production at companies like Meta, rolling out the compiler to production for your app will depend on the health of your codebase and how well you’ve followed the [Rules of React](/reference/rules). -React Compiler requires React 19 RC. If you are unable to upgrade to React 19, you may try a userspace implementation of the cache function as described in the [Working Group](https://github.com/reactwg/react-compiler/discussions/6). However, please note that this is not recommended and you should upgrade to React 19 when possible. +The latest Beta release can be found with the `@beta` tag, and daily experimental releases with `@experimental`. -React Compiler is a new experimental compiler that we've open sourced to get early feedback from the community. It is a build-time only tool that automatically optimizes your React app. It works with plain JavaScript, and understands the [Rules of React](/reference/rules), so you don't need to rewrite any code to use it. +React Compiler is a new compiler that we've open sourced to get early feedback from the community. It is a build-time only tool that automatically optimizes your React app. It works with plain JavaScript, and understands the [Rules of React](/reference/rules), so you don't need to rewrite any code to use it. -The compiler also includes an [eslint plugin](#installing-eslint-plugin-react-compiler) that surfaces the analysis from the compiler right in your editor. The plugin runs independently of the compiler and can be used even if you aren't using the compiler in your app. We recommend all React developers to use this eslint plugin to help improve the quality of your codebase. +The compiler also includes an [ESLint plugin](#installing-eslint-plugin-react-compiler) that surfaces the analysis from the compiler right in your editor. **We strongly recommend everyone use the linter today.** The linter does not require that you have the compiler installed, so you can use it even if you are not ready to try out the compiler. + +The compiler is currently released as `beta`, and is available to try out on React 17+ apps and libraries. To install the Beta: + + +npm install -D babel-plugin-react-compiler@beta eslint-plugin-react-compiler@beta + + +Or, if you're using Yarn: + + +yarn add -D babel-plugin-react-compiler@beta eslint-plugin-react-compiler@beta + + +If you are not using React 19 yet, please see [the section below](#using-react-compiler-with-react-17-or-18) for further instructions. ### What does the compiler do? {/*what-does-the-compiler-do*/} @@ -34,6 +48,10 @@ In order to optimize applications, React Compiler automatically memoizes your co The compiler uses its knowledge of JavaScript and React's rules to automatically memoize values or groups of values within your components and hooks. If it detects breakages of the rules, it will automatically skip over just those components or hooks, and continue safely compiling other code. + +React Compiler can statically detect when Rules of React are broken, and safely opt-out of optimizing just the affected components or hooks. It is not necessary for the compiler to optimize 100% of your codebase. + + If your codebase is already very well-memoized, you might not expect to see major performance improvements with the compiler. However, in practice memoizing the correct dependencies that cause performance issues is tricky to get right by hand. @@ -96,19 +114,9 @@ However, if `expensivelyProcessAReallyLargeArrayOfObjects` is truly an expensive So if `expensivelyProcessAReallyLargeArrayOfObjects` was used in many different components, even if the same exact items were passed down, that expensive calculation would be run repeatedly. We recommend [profiling](https://react.dev/reference/react/useMemo#how-to-tell-if-a-calculation-is-expensive) first to see if it really is that expensive before making code more complicated. -### What does the compiler assume? {/*what-does-the-compiler-assume*/} - -React Compiler assumes that your code: - -1. Is valid, semantic JavaScript -2. Tests that nullable/optional values and properties are defined before accessing them (for example, by enabling [`strictNullChecks`](https://www.typescriptlang.org/tsconfig/#strictNullChecks) if using TypeScript), i.e., `if (object.nullableProperty) { object.nullableProperty.foo }` or with optional-chaining `object.nullableProperty?.foo` -3. Follows the [Rules of React](https://react.dev/reference/rules) - -React Compiler can verify many of the Rules of React statically, and will safely skip compilation when it detects an error. To see the errors we recommend also installing [eslint-plugin-react-compiler](https://www.npmjs.com/package/eslint-plugin-react-compiler). - ### Should I try out the compiler? {/*should-i-try-out-the-compiler*/} -Please note that the compiler is still experimental and has many rough edges. While it has been used in production at companies like Meta, rolling out the compiler to production for your app will depend on the health of your codebase and how well you've followed the [Rules of React](/reference/rules). +Please note that the compiler is still in Beta and has many rough edges. While it has been used in production at companies like Meta, rolling out the compiler to production for your app will depend on the health of your codebase and how well you've followed the [Rules of React](/reference/rules). **You don't have to rush into using the compiler now. It's okay to wait until it reaches a stable release before adopting it.** However, we do appreciate trying it out in small experiments in your apps so that you can [provide feedback](#reporting-issues) to us to help make the compiler better. @@ -116,37 +124,32 @@ Please note that the compiler is still experimental and has many rough edges. Wh In addition to these docs, we recommend checking the [React Compiler Working Group](https://github.com/reactwg/react-compiler) for additional information and discussion about the compiler. -### Checking compatibility {/*checking-compatibility*/} - -Prior to installing the compiler, you can first check to see if your codebase is compatible: - - -npx react-compiler-healthcheck@latest - - -This script will: - -- Check how many components can be successfully optimized: higher is better -- Check for `` usage: having this enabled and followed means a higher chance that the [Rules of React](/reference/rules) are followed -- Check for incompatible library usage: known libraries that are incompatible with the compiler +### Installing eslint-plugin-react-compiler {/*installing-eslint-plugin-react-compiler*/} -As an example: +React Compiler also powers an ESLint plugin. The ESLint plugin can be used **independently** of the compiler, meaning you can use the ESLint plugin even if you don't use the compiler. -Successfully compiled 8 out of 9 components. -StrictMode usage not found. -Found no usage of incompatible libraries. +npm install -D eslint-plugin-react-compiler@beta -### Installing eslint-plugin-react-compiler {/*installing-eslint-plugin-react-compiler*/} - -React Compiler also powers an eslint plugin. The eslint plugin can be used **independently** of the compiler, meaning you can use the eslint plugin even if you don't use the compiler. +Then, add it to your ESLint config: - -npm install eslint-plugin-react-compiler - +```js +import reactCompiler from 'eslint-plugin-react-compiler' + +export default [ + { + plugins: { + 'react-compiler': reactCompiler, + }, + rules: { + 'react-compiler/react-compiler': 'error', + }, + }, +] +``` -Then, add it to your eslint config: +Or, in the deprecated eslintrc config format: ```js module.exports = { @@ -154,14 +157,16 @@ module.exports = { 'eslint-plugin-react-compiler', ], rules: { - 'react-compiler/react-compiler': "error", + 'react-compiler/react-compiler': 'error', }, } ``` -The eslint plugin will display any violations of the rules of React in your editor. When it does this, it means that the compiler has skipped over optimizing that component or hook. This is perfectly okay, and the compiler can recover and continue optimizing other components in your codebase. +The ESLint plugin will display any violations of the rules of React in your editor. When it does this, it means that the compiler has skipped over optimizing that component or hook. This is perfectly okay, and the compiler can recover and continue optimizing other components in your codebase. -**You don't have to fix all eslint violations straight away.** You can address them at your own pace to increase the amount of components and hooks being optimized, but it is not required to fix everything before you can use the compiler. + +**You don't have to fix all ESLint violations straight away.** You can address them at your own pace to increase the amount of components and hooks being optimized, but it is not required to fix everything before you can use the compiler. + ### Rolling out the compiler to your codebase {/*using-the-compiler-effectively*/} @@ -178,32 +183,53 @@ const ReactCompilerConfig = { }; ``` -In rare cases, you can also configure the compiler to run in "opt-in" mode using the `compilationMode: "annotation"` option. This makes it so the compiler will only compile components and hooks annotated with a `"use memo"` directive. Please note that the `annotation` mode is a temporary one to aid early adopters, and that we don't intend for the `"use memo"` directive to be used for the long term. +When you have more confidence with rolling out the compiler, you can expand coverage to other directories as well and slowly roll it out to your whole app. -```js {2,7} +#### New projects {/*new-projects*/} + +If you're starting a new project, you can enable the compiler on your entire codebase, which is the default behavior. + +### Using React Compiler with React 17 or 18 {/*using-react-compiler-with-react-17-or-18*/} + +React Compiler works best with React 19 RC. If you are unable to upgrade, you can install the extra `react-compiler-runtime` package which will allow the compiled code to run on versions prior to 19. However, note that the minimum supported version is 17. + + +npm install react-compiler-runtime@beta + + +You should also add the correct `target` to your compiler config, where `target` is the major version of React you are targeting: + +```js {3} +// babel.config.js const ReactCompilerConfig = { - compilationMode: "annotation", + target: '18' // '17' | '18' | '19' }; -// src/app.jsx -export default function App() { - "use memo"; - // ... -} +module.exports = function () { + return { + plugins: [ + ['babel-plugin-react-compiler', ReactCompilerConfig], + ], + }; +}; ``` -When you have more confidence with rolling out the compiler, you can expand coverage to other directories as well and slowly roll it out to your whole app. +### Using the compiler on libraries {/*using-the-compiler-on-libraries*/} -#### New projects {/*new-projects*/} +React Compiler can also be used to compile libraries. Because React Compiler needs to run on the original source code prior to any code transformations, it is not possible for an application's build pipeline to compile the libraries they use. Hence, our recommendation is for library maintainers to independently compile and test their libraries with the compiler, and ship compiled code to npm. -If you're starting a new project, you can enable the compiler on your entire codebase, which is the default behavior. +Because your code is pre-compiled, users of your library will not need to have the compiler enabled in order to benefit from the automatic memoization applied to your library. If your library targets apps not yet on React 19, specify a minimum [`target` and add `react-compiler-runtime` as a direct dependency](#using-react-compiler-with-react-17-or-18). The runtime package will use the correct implementation of APIs depending on the application's version, and polyfill the missing APIs if necessary. + +Library code can often require more complex patterns and usage of escape hatches. For this reason, we recommend ensuring that you have sufficient testing in order to identify any issues that might arise from using the compiler on your library. If you identify any issues, you can always opt-out the specific components or hooks with the [`'use no memo'` directive](#something-is-not-working-after-compilation). + +Similarly to apps, it is not necessary to fully compile 100% of your components or hooks to see benefits in your library. A good starting point might be to identify the most performance sensitive parts of your library and ensuring that they don't break the [Rules of React](/reference/rules), which you can use `eslint-plugin-react-compiler` to identify. ## Usage {/*installation*/} ### Babel {/*usage-with-babel*/} -npm install babel-plugin-react-compiler +npm install babel-plugin-react-compiler@beta The compiler includes a Babel plugin which you can use in your build pipeline to run the compiler. @@ -252,36 +278,7 @@ export default defineConfig(() => { ### Next.js {/*usage-with-nextjs*/} -Next.js has an experimental configuration to enable the React Compiler. It automatically ensures Babel is set up with `babel-plugin-react-compiler`. - -- Install Next.js canary, which uses React 19 Release Candidate -- Install `babel-plugin-react-compiler` - - -npm install next@canary babel-plugin-react-compiler - - -Then configure the experimental option in `next.config.js`: - -```js {4,5,6} -// next.config.js -/** @type {import('next').NextConfig} */ -const nextConfig = { - experimental: { - reactCompiler: true, - }, -}; - -module.exports = nextConfig; -``` - -Using the experimental option ensures support for the React Compiler in: - -- App Router -- Pages Router -- Webpack (default) -- Turbopack (opt-in through `--turbo`) - +Please refer to the [Next.js docs](https://nextjs.org/docs/app/api-reference/next-config-js/reactCompiler) for more information. ### Remix {/*usage-with-remix*/} Install `vite-plugin-babel`, and add the compiler's Babel plugin to it: @@ -314,44 +311,11 @@ export default defineConfig({ ### Webpack {/*usage-with-webpack*/} -You can create your own loader for React Compiler, like so: - -```js -const ReactCompilerConfig = { /* ... */ }; -const BabelPluginReactCompiler = require('babel-plugin-react-compiler'); - -function reactCompilerLoader(sourceCode, sourceMap) { - // ... - const result = transformSync(sourceCode, { - // ... - plugins: [ - [BabelPluginReactCompiler, ReactCompilerConfig], - ], - // ... - }); - - if (result === null) { - this.callback( - Error( - `Failed to transform "${options.filename}"` - ) - ); - return; - } - - this.callback( - null, - result.code, - result.map === null ? undefined : result.map - ); -} - -module.exports = reactCompilerLoader; -``` +A community Webpack loader is [now available here](https://github.com/SukkaW/react-compiler-webpack). ### Expo {/*usage-with-expo*/} -Please refer to [Expo's docs](https://docs.expo.dev/preview/react-compiler/) to enable and use the React Compiler in Expo apps. +Please refer to [Expo's docs](https://docs.expo.dev/guides/react-compiler/) to enable and use the React Compiler in Expo apps. ### Metro (React Native) {/*usage-with-react-native-metro*/} @@ -371,22 +335,26 @@ To report issues, please first create a minimal repro on the [React Compiler Pla You can also provide feedback in the React Compiler Working Group by applying to be a member. Please see [the README for more details on joining](https://github.com/reactwg/react-compiler). -### `(0 , _c) is not a function` error {/*0--_c-is-not-a-function-error*/} +### What does the compiler assume? {/*what-does-the-compiler-assume*/} -This occurs if you are not using React 19 RC and up. To fix this, [upgrade your app to React 19 RC](https://react.dev/blog/2024/04/25/react-19-upgrade-guide) first. +React Compiler assumes that your code: -If you are unable to upgrade to React 19, you may try a userspace implementation of the cache function as described in the [Working Group](https://github.com/reactwg/react-compiler/discussions/6). However, please note that this is not recommended and you should upgrade to React 19 when possible. +1. Is valid, semantic JavaScript. +2. Tests that nullable/optional values and properties are defined before accessing them (for example, by enabling [`strictNullChecks`](https://www.typescriptlang.org/tsconfig/#strictNullChecks) if using TypeScript), i.e., `if (object.nullableProperty) { object.nullableProperty.foo }` or with optional-chaining `object.nullableProperty?.foo`. +3. Follows the [Rules of React](https://react.dev/reference/rules). + +React Compiler can verify many of the Rules of React statically, and will safely skip compilation when it detects an error. To see the errors we recommend also installing [eslint-plugin-react-compiler](https://www.npmjs.com/package/eslint-plugin-react-compiler). ### How do I know my components have been optimized? {/*how-do-i-know-my-components-have-been-optimized*/} [React Devtools](/learn/react-developer-tools) (v5.0+) has built-in support for React Compiler and will display a "Memo ✨" badge next to components that have been optimized by the compiler. ### Something is not working after compilation {/*something-is-not-working-after-compilation*/} -If you have eslint-plugin-react-compiler installed, the compiler will display any violations of the rules of React in your editor. When it does this, it means that the compiler has skipped over optimizing that component or hook. This is perfectly okay, and the compiler can recover and continue optimizing other components in your codebase. **You don't have to fix all eslint violations straight away.** You can address them at your own pace to increase the amount of components and hooks being optimized. +If you have eslint-plugin-react-compiler installed, the compiler will display any violations of the rules of React in your editor. When it does this, it means that the compiler has skipped over optimizing that component or hook. This is perfectly okay, and the compiler can recover and continue optimizing other components in your codebase. **You don't have to fix all ESLint violations straight away.** You can address them at your own pace to increase the amount of components and hooks being optimized. Due to the flexible and dynamic nature of JavaScript however, it's not possible to comprehensively detect all cases. Bugs and undefined behavior such as infinite loops may occur in those cases. -If your app doesn't work properly after compilation and you aren't seeing any eslint errors, the compiler may be incorrectly compiling your code. To confirm this, try to make the issue go away by aggressively opting out any component or hook you think might be related via the [`"use no memo"` directive](#opt-out-of-the-compiler-for-a-component). +If your app doesn't work properly after compilation and you aren't seeing any ESLint errors, the compiler may be incorrectly compiling your code. To confirm this, try to make the issue go away by aggressively opting out any component or hook you think might be related via the [`"use no memo"` directive](#opt-out-of-the-compiler-for-a-component). ```js {2} function SuspiciousComponent() { diff --git a/src/content/learn/synchronizing-with-effects.md b/src/content/learn/synchronizing-with-effects.md index 48e99cc27..115075161 100644 --- a/src/content/learn/synchronizing-with-effects.md +++ b/src/content/learn/synchronizing-with-effects.md @@ -627,7 +627,7 @@ See the examples below for how to handle common patterns. ### Controlling non-React widgets {/*controlling-non-react-widgets*/} -Sometimes you need to add UI widgets that aren't written to React. For example, let's say you're adding a map component to your page. It has a `setZoomLevel()` method, and you'd like to keep the zoom level in sync with a `zoomLevel` state variable in your React code. Your Effect would look similar to this: +Sometimes you need to add UI widgets that aren't written in React. For example, let's say you're adding a map component to your page. It has a `setZoomLevel()` method, and you'd like to keep the zoom level in sync with a `zoomLevel` state variable in your React code. Your Effect would look similar to this: ```js useEffect(() => { diff --git a/src/content/learn/thinking-in-react.md b/src/content/learn/thinking-in-react.md index 3ac87f89e..e37dda5b1 100644 --- a/src/content/learn/thinking-in-react.md +++ b/src/content/learn/thinking-in-react.md @@ -265,11 +265,19 @@ W poprzednim kroku znaleźliśmy dwa fragmenty stanu aplikacji: tekst wyszukiwar Zastosujmy na tym stanie poznaną przez nas strategię: +<<<<<<< HEAD 1. **Zidentyfikuj komponenty, które korzystają z tego stanu:** * `ProductTable` musi filtrować produkty na podstawie tego stanu (tekstu wyszukiwarki i wartości pola wyboru). * `SearchBar` musi wyświetlać ten stan (tekst wyszukiwarki i wartość pola wyboru). 1. **Znajdź ich wspólnego rodzica:** Pierwszym rodzicem wspólnym dla obydwu komponentów jest `FilterableProductTable`. 2. **Zdecyduj, gdzie stan powinien być umieszczony**: Będziemy trzymać go w `FilterableProductTable`. +======= +1. **Identify components that use state:** + * `ProductTable` needs to filter the product list based on that state (search text and checkbox value). + * `SearchBar` needs to display that state (search text and checkbox value). +2. **Find their common parent:** The first parent component both components share is `FilterableProductTable`. +3. **Decide where the state lives**: We'll keep the filter text and checked state values in `FilterableProductTable`. +>>>>>>> 84f29eb20af17e9c154b9ad71c21af4c9171e4a2 Tak więc wartości stanu będą przechowywane w komponencie `FilterableProductTable`. diff --git a/src/content/learn/tutorial-tic-tac-toe.md b/src/content/learn/tutorial-tic-tac-toe.md index f18ec4939..6487e8007 100644 --- a/src/content/learn/tutorial-tic-tac-toe.md +++ b/src/content/learn/tutorial-tic-tac-toe.md @@ -1133,7 +1133,7 @@ Calling the `setSquares` function lets React know the state of the component has -JavaScript supports [closures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures) which means an inner function (e.g. `handleClick`) has access to variables and functions defined in a outer function (e.g. `Board`). The `handleClick` function can read the `squares` state and call the `setSquares` method because they are both defined inside of the `Board` function. +JavaScript supports [closures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures) which means an inner function (e.g. `handleClick`) has access to variables and functions defined in an outer function (e.g. `Board`). The `handleClick` function can read the `squares` state and call the `setSquares` method because they are both defined inside of the `Board` function. diff --git a/src/content/learn/updating-objects-in-state.md b/src/content/learn/updating-objects-in-state.md index 13459e6ba..3f9cb890d 100644 --- a/src/content/learn/updating-objects-in-state.md +++ b/src/content/learn/updating-objects-in-state.md @@ -57,6 +57,7 @@ This example holds an object in state to represent the current pointer position. ```js import { useState } from 'react'; + export default function MovingDot() { const [position, setPosition] = useState({ x: 0, @@ -127,6 +128,7 @@ Notice how the red dot now follows your pointer when you touch or hover over the ```js import { useState } from 'react'; + export default function MovingDot() { const [position, setPosition] = useState({ x: 0, @@ -377,7 +379,7 @@ Note that the `...` spread syntax is "shallow"--it only copies things one level #### Using a single event handler for multiple fields {/*using-a-single-event-handler-for-multiple-fields*/} -You can also use the `[` and `]` braces inside your object definition to specify a property with dynamic name. Here is the same example, but with a single event handler instead of three different ones: +You can also use the `[` and `]` braces inside your object definition to specify a property with a dynamic name. Here is the same example, but with a single event handler instead of three different ones: diff --git a/src/content/learn/you-might-not-need-an-effect.md b/src/content/learn/you-might-not-need-an-effect.md index 66cdc3117..a009793ab 100644 --- a/src/content/learn/you-might-not-need-an-effect.md +++ b/src/content/learn/you-might-not-need-an-effect.md @@ -408,9 +408,9 @@ function Game() { There are two problems with this code. -One problem is that it is very inefficient: the component (and its children) have to re-render between each `set` call in the chain. In the example above, in the worst case (`setCard` → render → `setGoldCardCount` → render → `setRound` → render → `setIsGameOver` → render) there are three unnecessary re-renders of the tree below. +The first problem is that it is very inefficient: the component (and its children) have to re-render between each `set` call in the chain. In the example above, in the worst case (`setCard` → render → `setGoldCardCount` → render → `setRound` → render → `setIsGameOver` → render) there are three unnecessary re-renders of the tree below. -Even if it weren't slow, as your code evolves, you will run into cases where the "chain" you wrote doesn't fit the new requirements. Imagine you are adding a way to step through the history of the game moves. You'd do it by updating each state variable to a value from the past. However, setting the `card` state to a value from the past would trigger the Effect chain again and change the data you're showing. Such code is often rigid and fragile. +The second problem is that even if it weren't slow, as your code evolves, you will run into cases where the "chain" you wrote doesn't fit the new requirements. Imagine you are adding a way to step through the history of the game moves. You'd do it by updating each state variable to a value from the past. However, setting the `card` state to a value from the past would trigger the Effect chain again and change the data you're showing. Such code is often rigid and fragile. In this case, it's better to calculate what you can during rendering, and adjust the state in the event handler: diff --git a/src/content/reference/react-dom/components/index.md b/src/content/reference/react-dom/components/index.md index c9b355c84..ec2e1d2ee 100644 --- a/src/content/reference/react-dom/components/index.md +++ b/src/content/reference/react-dom/components/index.md @@ -34,7 +34,7 @@ They are special in React because passing the `value` prop to them makes them *[ ## Resource and Metadata Components {/*resource-and-metadata-components*/} -These bulit-in browser components let you load external resources or annotate the document with metadata: +These built-in browser components let you load external resources or annotate the document with metadata: * [``](/reference/react-dom/components/link) * [``](/reference/react-dom/components/meta) diff --git a/src/content/reference/react-dom/preinitModule.md b/src/content/reference/react-dom/preinitModule.md index 996c5a2ed..5f9be6d50 100644 --- a/src/content/reference/react-dom/preinitModule.md +++ b/src/content/reference/react-dom/preinitModule.md @@ -51,7 +51,7 @@ The `preinitModule` function provides the browser with a hint that it should sta #### Parameters {/*parameters*/} -* `href`: a string. The URL of the module you want to download and exeucute. +* `href`: a string. The URL of the module you want to download and execute. * `options`: an object. It contains the following properties: * `as`: a required string. It must be `'script'`. * `crossOrigin`: a string. The [CORS policy](https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/crossorigin) to use. Its possible values are `anonymous` and `use-credentials`. diff --git a/src/content/reference/react-dom/server/renderToPipeableStream.md b/src/content/reference/react-dom/server/renderToPipeableStream.md index 20a5960eb..7d0d1ab3d 100644 --- a/src/content/reference/react-dom/server/renderToPipeableStream.md +++ b/src/content/reference/react-dom/server/renderToPipeableStream.md @@ -57,7 +57,7 @@ On the client, call [`hydrateRoot`](/reference/react-dom/client/hydrateRoot) to * **optional** `nonce`: A [`nonce`](http://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#nonce) string to allow scripts for [`script-src` Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src). * **optional** `onAllReady`: A callback that fires when all rendering is complete, including both the [shell](#specifying-what-goes-into-the-shell) and all additional [content.](#streaming-more-content-as-it-loads) You can use this instead of `onShellReady` [for crawlers and static generation.](#waiting-for-all-content-to-load-for-crawlers-and-static-generation) If you start streaming here, you won't get any progressive loading. The stream will contain the final HTML. * **optional** `onError`: A callback that fires whenever there is a server error, whether [recoverable](#recovering-from-errors-outside-the-shell) or [not.](#recovering-from-errors-inside-the-shell) By default, this only calls `console.error`. If you override it to [log crash reports,](#logging-crashes-on-the-server) make sure that you still call `console.error`. You can also use it to [adjust the status code](#setting-the-status-code) before the shell is emitted. - * **optional** `onShellReady`: A callback that fires right after the [initial shell](#specifying-what-goes-into-the-shell) has been rendered. You can [set the status code](#setting-the-status-code) and call `pipe` here to start streaming. React will [stream the additional content](#streaming-more-content-as-it-loads) after the shell along with the inline `