From 5b9a2ce6495f706cfba0140aa91481daf7756fbd Mon Sep 17 00:00:00 2001 From: lauren Date: Tue, 16 Sep 2025 11:05:33 -0400 Subject: [PATCH 01/15] Upgrade babel-plugin-react-compiler (#7985) Happened to notice we were still on an old version of the compiler. This PR upgrades us to use the latest RC. --- package.json | 2 +- yarn.lock | 10 +++++----- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/package.json b/package.json index c1cd16741..61d6cd5e4 100644 --- a/package.json +++ b/package.json @@ -61,7 +61,7 @@ "asyncro": "^3.0.0", "autoprefixer": "^10.4.2", "babel-eslint": "10.x", - "babel-plugin-react-compiler": "19.0.0-beta-e552027-20250112", + "babel-plugin-react-compiler": "^19.1.0-rc.3", "chalk": "4.1.2", "eslint": "7.x", "eslint-config-next": "12.0.3", diff --git a/yarn.lock b/yarn.lock index e5eecaac2..cc7843bb8 100644 --- a/yarn.lock +++ b/yarn.lock @@ -2273,12 +2273,12 @@ babel-plugin-dynamic-import-node@^2.3.3: dependencies: object.assign "^4.1.0" -babel-plugin-react-compiler@19.0.0-beta-e552027-20250112: - version "19.0.0-beta-e552027-20250112" - resolved "https://registry.yarnpkg.com/babel-plugin-react-compiler/-/babel-plugin-react-compiler-19.0.0-beta-e552027-20250112.tgz#f06f0436420bd09df5abf37337ecd8fb43b0d847" - integrity sha512-pUTT0mAZ4XLewC6bvqVeX015nVRLVultcSQlkzGdC10G6YV6K2h4E7cwGlLAuLKWTj3Z08mTO9uTnPP/opUBsg== +babel-plugin-react-compiler@^19.1.0-rc.3: + version "19.1.0-rc.3" + resolved "https://registry.yarnpkg.com/babel-plugin-react-compiler/-/babel-plugin-react-compiler-19.1.0-rc.3.tgz#45e5a282a2460b3701971e5eb8310a90a7919022" + integrity sha512-mjRn69WuTz4adL0bXGx8Rsyk1086zFJeKmes6aK0xPuK3aaXmDJdLHqwKKMrpm6KAI1MCoUK72d2VeqQbu8YIA== dependencies: - "@babel/types" "^7.19.0" + "@babel/types" "^7.26.0" bail@^1.0.0: version "1.0.5" From a566d87b2bad41e1e5fce7240dbbcf494c8024a2 Mon Sep 17 00:00:00 2001 From: lauren Date: Thu, 18 Sep 2025 14:42:27 -0400 Subject: [PATCH 02/15] Add copyright script (#7991) Copied over our copyright script from the react repo. I made a small fix to handle shebangs. --- package.json | 3 +- scripts/copyright.js | 84 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 86 insertions(+), 1 deletion(-) create mode 100644 scripts/copyright.js diff --git a/package.json b/package.json index 61d6cd5e4..8d480ad43 100644 --- a/package.json +++ b/package.json @@ -21,7 +21,8 @@ "postinstall": "is-ci || husky install .husky", "check-all": "npm-run-all prettier lint:fix tsc rss", "rss": "node scripts/generateRss.js", - "deadlinks": "node scripts/deadLinkChecker.js" + "deadlinks": "node scripts/deadLinkChecker.js", + "copyright": "node scripts/copyright.js" }, "dependencies": { "@codesandbox/sandpack-react": "2.13.5", diff --git a/scripts/copyright.js b/scripts/copyright.js new file mode 100644 index 000000000..f1c6f786c --- /dev/null +++ b/scripts/copyright.js @@ -0,0 +1,84 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + +'use strict'; + +const fs = require('fs'); +const glob = require('glob'); + +const META_COPYRIGHT_COMMENT_BLOCK = + `/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */`.trim() + '\n\n'; + +const files = glob.sync('**/*.{js,ts,tsx,jsx,rs}', { + ignore: [ + '**/dist/**', + '**/node_modules/**', + '**/tests/fixtures/**', + '**/__tests__/fixtures/**', + ], +}); + +const updatedFiles = new Map(); +let hasErrors = false; +files.forEach((file) => { + try { + const result = processFile(file); + if (result != null) { + updatedFiles.set(file, result); + } + } catch (e) { + console.error(e); + hasErrors = true; + } +}); +if (hasErrors) { + console.error('Update failed'); + process.exit(1); +} else { + for (const [file, source] of updatedFiles) { + fs.writeFileSync(file, source, 'utf8'); + } + console.log('Update complete'); +} + +function processFile(file) { + if (fs.lstatSync(file).isDirectory()) { + return; + } + let source = fs.readFileSync(file, 'utf8'); + let shebang = ''; + + if (source.startsWith('#!')) { + const newlineIndex = source.indexOf('\n'); + if (newlineIndex === -1) { + shebang = `${source}\n`; + source = ''; + } else { + shebang = source.slice(0, newlineIndex + 1); + source = source.slice(newlineIndex + 1); + } + } + + if (source.indexOf(META_COPYRIGHT_COMMENT_BLOCK) === 0) { + return null; + } + if (/^\/\*\*/.test(source)) { + source = source.replace(/\/\*\*[^\/]+\/\s+/, META_COPYRIGHT_COMMENT_BLOCK); + } else { + source = `${META_COPYRIGHT_COMMENT_BLOCK}${source}`; + } + + if (shebang) { + return `${shebang}${source}`; + } + return source; +} From bd03b86c0241220949626717112800b35847d13d Mon Sep 17 00:00:00 2001 From: lauren Date: Thu, 18 Sep 2025 14:42:36 -0400 Subject: [PATCH 03/15] Update copyright on all files (#7992) * Add copyright script Copied over our copyright script from the react repo. I made a small fix to handle shebangs. * Update copyright on all files Run the script. --- colors.js | 7 +++++++ next-env.d.ts | 7 +++++++ next.config.js | 7 +++++++ plugins/markdownToHtml.js | 7 +++++++ plugins/remark-header-custom-ids.js | 5 ++++- plugins/remark-smartypants.js | 7 +++++++ postcss.config.js | 7 +++++++ public/js/jsfiddle-integration-babel.js | 5 ++++- public/js/jsfiddle-integration.js | 5 ++++- scripts/deadLinkChecker.js | 6 ++++++ scripts/generateRss.js | 7 +++++++ scripts/headingIDHelpers/generateHeadingIDs.js | 5 ++++- scripts/headingIDHelpers/validateHeadingIDs.js | 6 +++++- scripts/headingIDHelpers/walk.js | 7 +++++++ scripts/headingIdLinter.js | 7 +++++++ src/components/Breadcrumbs.tsx | 7 +++++++ src/components/Button.tsx | 7 +++++++ src/components/ButtonLink.tsx | 7 +++++++ src/components/DocsFooter.tsx | 7 +++++++ src/components/ErrorDecoderContext.tsx | 7 +++++++ src/components/ExternalLink.tsx | 7 +++++++ src/components/Icon/IconArrow.tsx | 7 +++++++ src/components/Icon/IconArrowSmall.tsx | 7 +++++++ src/components/Icon/IconBsky.tsx | 7 +++++++ src/components/Icon/IconCanary.tsx | 7 +++++++ src/components/Icon/IconChevron.tsx | 7 +++++++ src/components/Icon/IconClose.tsx | 7 +++++++ src/components/Icon/IconCodeBlock.tsx | 7 +++++++ src/components/Icon/IconCopy.tsx | 7 +++++++ src/components/Icon/IconDeepDive.tsx | 7 +++++++ src/components/Icon/IconDownload.tsx | 7 +++++++ src/components/Icon/IconError.tsx | 7 +++++++ src/components/Icon/IconExperimental.tsx | 7 +++++++ src/components/Icon/IconFacebookCircle.tsx | 7 +++++++ src/components/Icon/IconGitHub.tsx | 7 +++++++ src/components/Icon/IconHamburger.tsx | 7 +++++++ src/components/Icon/IconHint.tsx | 7 +++++++ src/components/Icon/IconInstagram.tsx | 7 +++++++ src/components/Icon/IconLink.tsx | 7 +++++++ src/components/Icon/IconNavArrow.tsx | 7 +++++++ src/components/Icon/IconNewPage.tsx | 7 +++++++ src/components/Icon/IconNote.tsx | 7 +++++++ src/components/Icon/IconPitfall.tsx | 7 +++++++ src/components/Icon/IconRestart.tsx | 7 +++++++ src/components/Icon/IconRocket.tsx | 7 +++++++ src/components/Icon/IconRss.tsx | 7 +++++++ src/components/Icon/IconSearch.tsx | 7 +++++++ src/components/Icon/IconSolution.tsx | 7 +++++++ src/components/Icon/IconTerminal.tsx | 7 +++++++ src/components/Icon/IconThreads.tsx | 7 +++++++ src/components/Icon/IconTwitter.tsx | 7 +++++++ src/components/Icon/IconWarning.tsx | 7 +++++++ src/components/Layout/Feedback.tsx | 7 +++++++ src/components/Layout/Footer.tsx | 7 +++++++ src/components/Layout/HomeContent.js | 7 +++++++ src/components/Layout/Page.tsx | 7 +++++++ src/components/Layout/Sidebar/SidebarButton.tsx | 7 +++++++ src/components/Layout/Sidebar/SidebarLink.tsx | 7 +++++++ src/components/Layout/Sidebar/SidebarRouteTree.tsx | 7 +++++++ src/components/Layout/Sidebar/index.tsx | 7 +++++++ src/components/Layout/SidebarNav/SidebarNav.tsx | 7 +++++++ src/components/Layout/SidebarNav/index.tsx | 7 +++++++ src/components/Layout/Toc.tsx | 7 +++++++ src/components/Layout/TopNav/BrandMenu.tsx | 7 +++++++ src/components/Layout/TopNav/TopNav.tsx | 7 +++++++ src/components/Layout/TopNav/index.tsx | 7 +++++++ src/components/Layout/getRouteMeta.tsx | 7 +++++++ src/components/Layout/useTocHighlight.tsx | 7 +++++++ src/components/Logo.tsx | 7 +++++++ src/components/MDX/BlogCard.tsx | 7 +++++++ src/components/MDX/Challenges/Challenge.tsx | 7 +++++++ src/components/MDX/Challenges/Challenges.tsx | 7 +++++++ src/components/MDX/Challenges/Navigation.tsx | 7 +++++++ src/components/MDX/Challenges/index.tsx | 7 +++++++ src/components/MDX/CodeBlock/CodeBlock.tsx | 7 +++++++ src/components/MDX/CodeBlock/index.tsx | 7 +++++++ src/components/MDX/CodeDiagram.tsx | 7 +++++++ src/components/MDX/ConsoleBlock.tsx | 7 +++++++ src/components/MDX/Diagram.tsx | 7 +++++++ src/components/MDX/DiagramGroup.tsx | 7 +++++++ src/components/MDX/ErrorDecoder.tsx | 7 +++++++ src/components/MDX/ExpandableCallout.tsx | 7 +++++++ src/components/MDX/ExpandableExample.tsx | 7 +++++++ src/components/MDX/Heading.tsx | 7 +++++++ src/components/MDX/InlineCode.tsx | 7 +++++++ src/components/MDX/Intro.tsx | 7 +++++++ src/components/MDX/LanguagesContext.tsx | 7 +++++++ src/components/MDX/Link.tsx | 7 +++++++ src/components/MDX/MDXComponents.tsx | 7 +++++++ src/components/MDX/PackageImport.tsx | 7 +++++++ src/components/MDX/Recap.tsx | 7 +++++++ src/components/MDX/Sandpack/ClearButton.tsx | 7 +++++++ src/components/MDX/Sandpack/Console.tsx | 7 +++++++ src/components/MDX/Sandpack/CustomPreset.tsx | 7 +++++++ src/components/MDX/Sandpack/DownloadButton.tsx | 7 +++++++ src/components/MDX/Sandpack/ErrorMessage.tsx | 7 +++++++ src/components/MDX/Sandpack/LoadingOverlay.tsx | 7 +++++++ src/components/MDX/Sandpack/NavigationBar.tsx | 7 +++++++ src/components/MDX/Sandpack/OpenInCodeSandboxButton.tsx | 7 +++++++ src/components/MDX/Sandpack/OpenInTypeScriptPlayground.tsx | 7 +++++++ src/components/MDX/Sandpack/Preview.tsx | 7 +++++++ src/components/MDX/Sandpack/ReloadButton.tsx | 7 +++++++ src/components/MDX/Sandpack/SandpackRoot.tsx | 7 +++++++ src/components/MDX/Sandpack/Themes.tsx | 7 +++++++ src/components/MDX/Sandpack/createFileMap.ts | 7 +++++++ src/components/MDX/Sandpack/index.tsx | 7 +++++++ src/components/MDX/Sandpack/runESLint.tsx | 7 +++++++ src/components/MDX/Sandpack/template.ts | 7 +++++++ src/components/MDX/Sandpack/useSandpackLint.tsx | 7 +++++++ src/components/MDX/SandpackWithHTMLOutput.tsx | 7 +++++++ src/components/MDX/SimpleCallout.tsx | 7 +++++++ src/components/MDX/TeamMember.tsx | 7 +++++++ src/components/MDX/TerminalBlock.tsx | 7 +++++++ src/components/MDX/TocContext.tsx | 7 +++++++ src/components/MDX/YouWillLearnCard.tsx | 7 +++++++ src/components/PageHeading.tsx | 7 +++++++ src/components/Search.tsx | 7 +++++++ src/components/Seo.tsx | 7 +++++++ src/components/SocialBanner.tsx | 4 +++- src/components/Tag.tsx | 7 +++++++ src/hooks/usePendingRoute.ts | 7 +++++++ src/pages/404.js | 7 +++++++ src/pages/500.js | 7 +++++++ src/pages/[[...markdownPath]].js | 7 +++++++ src/pages/_app.tsx | 7 +++++++ src/pages/_document.tsx | 7 +++++++ src/pages/errors/[errorCode].tsx | 7 +++++++ src/pages/errors/index.tsx | 7 +++++++ src/siteConfig.js | 7 +++++++ src/types/docsearch-react-modal.d.ts | 7 +++++++ src/utils/analytics.ts | 7 +++++++ src/utils/compileMDX.ts | 7 +++++++ src/utils/finishedTranslations.ts | 7 +++++++ src/utils/forwardRefWithAs.tsx | 7 +++++++ src/utils/prepareMDX.js | 7 +++++++ src/utils/processShim.js | 7 +++++++ src/utils/rafShim.js | 7 +++++++ src/utils/rss.js | 7 +++++++ src/utils/toCommaSeparatedList.tsx | 7 +++++++ tailwind.config.js | 7 +++++++ 140 files changed, 961 insertions(+), 6 deletions(-) diff --git a/colors.js b/colors.js index 872f33cac..2b282c820 100644 --- a/colors.js +++ b/colors.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/next-env.d.ts b/next-env.d.ts index 52e831b43..bc6d2a23d 100644 --- a/next-env.d.ts +++ b/next-env.d.ts @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /// /// diff --git a/next.config.js b/next.config.js index 861792c8e..5a5755307 100644 --- a/next.config.js +++ b/next.config.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/plugins/markdownToHtml.js b/plugins/markdownToHtml.js index 0d5fe7afb..e9b0c3ec3 100644 --- a/plugins/markdownToHtml.js +++ b/plugins/markdownToHtml.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + const remark = require('remark'); const externalLinks = require('remark-external-links'); // Add _target and rel to external links const customHeaders = require('./remark-header-custom-ids'); // Custom header id's for i18n diff --git a/plugins/remark-header-custom-ids.js b/plugins/remark-header-custom-ids.js index 356de1bf1..c5430ce8a 100644 --- a/plugins/remark-header-custom-ids.js +++ b/plugins/remark-header-custom-ids.js @@ -1,5 +1,8 @@ /** - * Copyright (c) Facebook, Inc. and its affiliates. + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. */ /*! diff --git a/plugins/remark-smartypants.js b/plugins/remark-smartypants.js index 4694ff674..f56f14b61 100644 --- a/plugins/remark-smartypants.js +++ b/plugins/remark-smartypants.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /*! * Based on 'silvenon/remark-smartypants' * https://github.com/silvenon/remark-smartypants/pull/80 diff --git a/postcss.config.js b/postcss.config.js index d55c43c90..6b55f9277 100644 --- a/postcss.config.js +++ b/postcss.config.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/public/js/jsfiddle-integration-babel.js b/public/js/jsfiddle-integration-babel.js index 56059472f..56133855a 100644 --- a/public/js/jsfiddle-integration-babel.js +++ b/public/js/jsfiddle-integration-babel.js @@ -1,5 +1,8 @@ /** - * Copyright (c) Facebook, Inc. and its affiliates. + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. */ // Do not delete or move this file. diff --git a/public/js/jsfiddle-integration.js b/public/js/jsfiddle-integration.js index 2151435d4..aeae13607 100644 --- a/public/js/jsfiddle-integration.js +++ b/public/js/jsfiddle-integration.js @@ -1,5 +1,8 @@ /** - * Copyright (c) Facebook, Inc. and its affiliates. + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. */ // Do not delete or move this file. diff --git a/scripts/deadLinkChecker.js b/scripts/deadLinkChecker.js index 90593b878..46a21cdc9 100644 --- a/scripts/deadLinkChecker.js +++ b/scripts/deadLinkChecker.js @@ -1,4 +1,10 @@ #!/usr/bin/env node +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ const fs = require('fs'); const path = require('path'); diff --git a/scripts/generateRss.js b/scripts/generateRss.js index e0f3d5561..3231b1d73 100644 --- a/scripts/generateRss.js +++ b/scripts/generateRss.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/scripts/headingIDHelpers/generateHeadingIDs.js b/scripts/headingIDHelpers/generateHeadingIDs.js index 40925d444..79839f513 100644 --- a/scripts/headingIDHelpers/generateHeadingIDs.js +++ b/scripts/headingIDHelpers/generateHeadingIDs.js @@ -1,5 +1,8 @@ /** - * Copyright (c) Facebook, Inc. and its affiliates. + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. */ // To do: Make this ESM. diff --git a/scripts/headingIDHelpers/validateHeadingIDs.js b/scripts/headingIDHelpers/validateHeadingIDs.js index c3cf1ab8c..798a63e12 100644 --- a/scripts/headingIDHelpers/validateHeadingIDs.js +++ b/scripts/headingIDHelpers/validateHeadingIDs.js @@ -1,6 +1,10 @@ /** - * Copyright (c) Facebook, Inc. and its affiliates. + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. */ + const fs = require('fs'); const walk = require('./walk'); diff --git a/scripts/headingIDHelpers/walk.js b/scripts/headingIDHelpers/walk.js index 54cd500ca..f1ed5e0b3 100644 --- a/scripts/headingIDHelpers/walk.js +++ b/scripts/headingIDHelpers/walk.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + const fs = require('fs'); module.exports = function walk(dir) { diff --git a/scripts/headingIdLinter.js b/scripts/headingIdLinter.js index 6b8f75fc7..32116752b 100644 --- a/scripts/headingIdLinter.js +++ b/scripts/headingIdLinter.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + const validateHeaderIds = require('./headingIDHelpers/validateHeadingIDs'); const generateHeadingIds = require('./headingIDHelpers/generateHeadingIDs'); diff --git a/src/components/Breadcrumbs.tsx b/src/components/Breadcrumbs.tsx index e64b486d1..177af2c56 100644 --- a/src/components/Breadcrumbs.tsx +++ b/src/components/Breadcrumbs.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Button.tsx b/src/components/Button.tsx index 65c0151ba..6b79a958f 100644 --- a/src/components/Button.tsx +++ b/src/components/Button.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/ButtonLink.tsx b/src/components/ButtonLink.tsx index 23c971756..bd98d5b38 100644 --- a/src/components/ButtonLink.tsx +++ b/src/components/ButtonLink.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/DocsFooter.tsx b/src/components/DocsFooter.tsx index 93c2ca125..158a54971 100644 --- a/src/components/DocsFooter.tsx +++ b/src/components/DocsFooter.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/ErrorDecoderContext.tsx b/src/components/ErrorDecoderContext.tsx index 080969efe..77e9ebf7d 100644 --- a/src/components/ErrorDecoderContext.tsx +++ b/src/components/ErrorDecoderContext.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + // Error Decoder requires reading pregenerated error message from getStaticProps, // but MDX component doesn't support props. So we use React Context to populate // the value without prop-drilling. diff --git a/src/components/ExternalLink.tsx b/src/components/ExternalLink.tsx index 13fe6d3a9..ccd91fe9c 100644 --- a/src/components/ExternalLink.tsx +++ b/src/components/ExternalLink.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconArrow.tsx b/src/components/Icon/IconArrow.tsx index 61e4e52cd..2d0b9fecd 100644 --- a/src/components/Icon/IconArrow.tsx +++ b/src/components/Icon/IconArrow.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconArrowSmall.tsx b/src/components/Icon/IconArrowSmall.tsx index a70717c9d..81301c047 100644 --- a/src/components/Icon/IconArrowSmall.tsx +++ b/src/components/Icon/IconArrowSmall.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconBsky.tsx b/src/components/Icon/IconBsky.tsx index 5d461556f..ec930923d 100644 --- a/src/components/Icon/IconBsky.tsx +++ b/src/components/Icon/IconBsky.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconCanary.tsx b/src/components/Icon/IconCanary.tsx index 7f584fed7..97b9f7cef 100644 --- a/src/components/Icon/IconCanary.tsx +++ b/src/components/Icon/IconCanary.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconChevron.tsx b/src/components/Icon/IconChevron.tsx index 4d40330ce..15f34e153 100644 --- a/src/components/Icon/IconChevron.tsx +++ b/src/components/Icon/IconChevron.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconClose.tsx b/src/components/Icon/IconClose.tsx index d685fb217..dc4ad7c72 100644 --- a/src/components/Icon/IconClose.tsx +++ b/src/components/Icon/IconClose.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconCodeBlock.tsx b/src/components/Icon/IconCodeBlock.tsx index 755a2ae34..ba61f237e 100644 --- a/src/components/Icon/IconCodeBlock.tsx +++ b/src/components/Icon/IconCodeBlock.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconCopy.tsx b/src/components/Icon/IconCopy.tsx index 500cd4fda..f62134607 100644 --- a/src/components/Icon/IconCopy.tsx +++ b/src/components/Icon/IconCopy.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconDeepDive.tsx b/src/components/Icon/IconDeepDive.tsx index dfe1a928c..121391f33 100644 --- a/src/components/Icon/IconDeepDive.tsx +++ b/src/components/Icon/IconDeepDive.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconDownload.tsx b/src/components/Icon/IconDownload.tsx index c0e7f49c2..be551d83e 100644 --- a/src/components/Icon/IconDownload.tsx +++ b/src/components/Icon/IconDownload.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconError.tsx b/src/components/Icon/IconError.tsx index f101f62b2..966777fd4 100644 --- a/src/components/Icon/IconError.tsx +++ b/src/components/Icon/IconError.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconExperimental.tsx b/src/components/Icon/IconExperimental.tsx index c0f69e3f9..c0dce97f4 100644 --- a/src/components/Icon/IconExperimental.tsx +++ b/src/components/Icon/IconExperimental.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconFacebookCircle.tsx b/src/components/Icon/IconFacebookCircle.tsx index 7f1080afa..dea2764d5 100644 --- a/src/components/Icon/IconFacebookCircle.tsx +++ b/src/components/Icon/IconFacebookCircle.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconGitHub.tsx b/src/components/Icon/IconGitHub.tsx index 1852f52f1..06c8f1556 100644 --- a/src/components/Icon/IconGitHub.tsx +++ b/src/components/Icon/IconGitHub.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconHamburger.tsx b/src/components/Icon/IconHamburger.tsx index 8bc90ee0c..5ab29fa37 100644 --- a/src/components/Icon/IconHamburger.tsx +++ b/src/components/Icon/IconHamburger.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconHint.tsx b/src/components/Icon/IconHint.tsx index b802bc79c..802382b5d 100644 --- a/src/components/Icon/IconHint.tsx +++ b/src/components/Icon/IconHint.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconInstagram.tsx b/src/components/Icon/IconInstagram.tsx index 79def08e3..00d25a909 100644 --- a/src/components/Icon/IconInstagram.tsx +++ b/src/components/Icon/IconInstagram.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconLink.tsx b/src/components/Icon/IconLink.tsx index e6e716d00..0f7d4dfed 100644 --- a/src/components/Icon/IconLink.tsx +++ b/src/components/Icon/IconLink.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconNavArrow.tsx b/src/components/Icon/IconNavArrow.tsx index f61175e9b..40fde8afe 100644 --- a/src/components/Icon/IconNavArrow.tsx +++ b/src/components/Icon/IconNavArrow.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconNewPage.tsx b/src/components/Icon/IconNewPage.tsx index dfa13bac9..aaf3e8157 100644 --- a/src/components/Icon/IconNewPage.tsx +++ b/src/components/Icon/IconNewPage.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconNote.tsx b/src/components/Icon/IconNote.tsx index 1510c91c7..82ed947b4 100644 --- a/src/components/Icon/IconNote.tsx +++ b/src/components/Icon/IconNote.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconPitfall.tsx b/src/components/Icon/IconPitfall.tsx index ee6247891..a80fc7d68 100644 --- a/src/components/Icon/IconPitfall.tsx +++ b/src/components/Icon/IconPitfall.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconRestart.tsx b/src/components/Icon/IconRestart.tsx index b4a6b62f5..976203c65 100644 --- a/src/components/Icon/IconRestart.tsx +++ b/src/components/Icon/IconRestart.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconRocket.tsx b/src/components/Icon/IconRocket.tsx index 457736c7c..c5bb2473a 100644 --- a/src/components/Icon/IconRocket.tsx +++ b/src/components/Icon/IconRocket.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconRss.tsx b/src/components/Icon/IconRss.tsx index 6208236f4..13029ec96 100644 --- a/src/components/Icon/IconRss.tsx +++ b/src/components/Icon/IconRss.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconSearch.tsx b/src/components/Icon/IconSearch.tsx index 917513561..1dda00eb2 100644 --- a/src/components/Icon/IconSearch.tsx +++ b/src/components/Icon/IconSearch.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconSolution.tsx b/src/components/Icon/IconSolution.tsx index 668e41afe..b0f1d44b3 100644 --- a/src/components/Icon/IconSolution.tsx +++ b/src/components/Icon/IconSolution.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconTerminal.tsx b/src/components/Icon/IconTerminal.tsx index 7b3a97a8c..66dfd47b7 100644 --- a/src/components/Icon/IconTerminal.tsx +++ b/src/components/Icon/IconTerminal.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconThreads.tsx b/src/components/Icon/IconThreads.tsx index 9ea0bafdf..72ded5201 100644 --- a/src/components/Icon/IconThreads.tsx +++ b/src/components/Icon/IconThreads.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconTwitter.tsx b/src/components/Icon/IconTwitter.tsx index e84971f4e..01802c253 100644 --- a/src/components/Icon/IconTwitter.tsx +++ b/src/components/Icon/IconTwitter.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Icon/IconWarning.tsx b/src/components/Icon/IconWarning.tsx index 83534ec5f..90b7cd41e 100644 --- a/src/components/Icon/IconWarning.tsx +++ b/src/components/Icon/IconWarning.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/Feedback.tsx b/src/components/Layout/Feedback.tsx index 34db728ce..fe9272517 100644 --- a/src/components/Layout/Feedback.tsx +++ b/src/components/Layout/Feedback.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/Footer.tsx b/src/components/Layout/Footer.tsx index 9cdf256fb..d11e1469d 100644 --- a/src/components/Layout/Footer.tsx +++ b/src/components/Layout/Footer.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/HomeContent.js b/src/components/Layout/HomeContent.js index 12fe32106..3cf7d5c2c 100644 --- a/src/components/Layout/HomeContent.js +++ b/src/components/Layout/HomeContent.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/Page.tsx b/src/components/Layout/Page.tsx index c3224e517..89c25f46f 100644 --- a/src/components/Layout/Page.tsx +++ b/src/components/Layout/Page.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/Sidebar/SidebarButton.tsx b/src/components/Layout/Sidebar/SidebarButton.tsx index dc1f29a8d..744172bec 100644 --- a/src/components/Layout/Sidebar/SidebarButton.tsx +++ b/src/components/Layout/Sidebar/SidebarButton.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/Sidebar/SidebarLink.tsx b/src/components/Layout/Sidebar/SidebarLink.tsx index aadb6cf4d..5c01fefc3 100644 --- a/src/components/Layout/Sidebar/SidebarLink.tsx +++ b/src/components/Layout/Sidebar/SidebarLink.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/Sidebar/SidebarRouteTree.tsx b/src/components/Layout/Sidebar/SidebarRouteTree.tsx index 72003df74..863355bfd 100644 --- a/src/components/Layout/Sidebar/SidebarRouteTree.tsx +++ b/src/components/Layout/Sidebar/SidebarRouteTree.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/Sidebar/index.tsx b/src/components/Layout/Sidebar/index.tsx index d0e291547..69664e6bc 100644 --- a/src/components/Layout/Sidebar/index.tsx +++ b/src/components/Layout/Sidebar/index.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/SidebarNav/SidebarNav.tsx b/src/components/Layout/SidebarNav/SidebarNav.tsx index 171270960..77beb4d72 100644 --- a/src/components/Layout/SidebarNav/SidebarNav.tsx +++ b/src/components/Layout/SidebarNav/SidebarNav.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/SidebarNav/index.tsx b/src/components/Layout/SidebarNav/index.tsx index b268bbd29..f9680d803 100644 --- a/src/components/Layout/SidebarNav/index.tsx +++ b/src/components/Layout/SidebarNav/index.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/Toc.tsx b/src/components/Layout/Toc.tsx index 5308c602c..e2e2169fd 100644 --- a/src/components/Layout/Toc.tsx +++ b/src/components/Layout/Toc.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/TopNav/BrandMenu.tsx b/src/components/Layout/TopNav/BrandMenu.tsx index 3bd8776f2..218e423ce 100644 --- a/src/components/Layout/TopNav/BrandMenu.tsx +++ b/src/components/Layout/TopNav/BrandMenu.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + import * as ContextMenu from '@radix-ui/react-context-menu'; import {IconCopy} from 'components/Icon/IconCopy'; import {IconDownload} from 'components/Icon/IconDownload'; diff --git a/src/components/Layout/TopNav/TopNav.tsx b/src/components/Layout/TopNav/TopNav.tsx index a4b431189..148098933 100644 --- a/src/components/Layout/TopNav/TopNav.tsx +++ b/src/components/Layout/TopNav/TopNav.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/TopNav/index.tsx b/src/components/Layout/TopNav/index.tsx index 8472fb126..e76fa5ed0 100644 --- a/src/components/Layout/TopNav/index.tsx +++ b/src/components/Layout/TopNav/index.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/getRouteMeta.tsx b/src/components/Layout/getRouteMeta.tsx index b3d14725d..5a85a3e21 100644 --- a/src/components/Layout/getRouteMeta.tsx +++ b/src/components/Layout/getRouteMeta.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Layout/useTocHighlight.tsx b/src/components/Layout/useTocHighlight.tsx index 544396c68..02385409f 100644 --- a/src/components/Layout/useTocHighlight.tsx +++ b/src/components/Layout/useTocHighlight.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Logo.tsx b/src/components/Logo.tsx index 8c4f7da4f..3ea4ba9ac 100644 --- a/src/components/Logo.tsx +++ b/src/components/Logo.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/BlogCard.tsx b/src/components/MDX/BlogCard.tsx index 1a16013a2..479617bed 100644 --- a/src/components/MDX/BlogCard.tsx +++ b/src/components/MDX/BlogCard.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Challenges/Challenge.tsx b/src/components/MDX/Challenges/Challenge.tsx index e54bf920a..8129ecb2a 100644 --- a/src/components/MDX/Challenges/Challenge.tsx +++ b/src/components/MDX/Challenges/Challenge.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Challenges/Challenges.tsx b/src/components/MDX/Challenges/Challenges.tsx index 21fc6865c..1b5dcfb1f 100644 --- a/src/components/MDX/Challenges/Challenges.tsx +++ b/src/components/MDX/Challenges/Challenges.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Challenges/Navigation.tsx b/src/components/MDX/Challenges/Navigation.tsx index b4d8c0924..0511bd05a 100644 --- a/src/components/MDX/Challenges/Navigation.tsx +++ b/src/components/MDX/Challenges/Navigation.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Challenges/index.tsx b/src/components/MDX/Challenges/index.tsx index 413fd4611..27e3df1ef 100644 --- a/src/components/MDX/Challenges/index.tsx +++ b/src/components/MDX/Challenges/index.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/CodeBlock/CodeBlock.tsx b/src/components/MDX/CodeBlock/CodeBlock.tsx index 42165c57d..3eeac3945 100644 --- a/src/components/MDX/CodeBlock/CodeBlock.tsx +++ b/src/components/MDX/CodeBlock/CodeBlock.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/CodeBlock/index.tsx b/src/components/MDX/CodeBlock/index.tsx index 551c1d1b6..d3ed3a065 100644 --- a/src/components/MDX/CodeBlock/index.tsx +++ b/src/components/MDX/CodeBlock/index.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/CodeDiagram.tsx b/src/components/MDX/CodeDiagram.tsx index 2a198fc56..ba18ae973 100644 --- a/src/components/MDX/CodeDiagram.tsx +++ b/src/components/MDX/CodeDiagram.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/ConsoleBlock.tsx b/src/components/MDX/ConsoleBlock.tsx index 6044b1370..1847abc5c 100644 --- a/src/components/MDX/ConsoleBlock.tsx +++ b/src/components/MDX/ConsoleBlock.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Diagram.tsx b/src/components/MDX/Diagram.tsx index 649f48dff..579c86ebe 100644 --- a/src/components/MDX/Diagram.tsx +++ b/src/components/MDX/Diagram.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/DiagramGroup.tsx b/src/components/MDX/DiagramGroup.tsx index 6c5130a3d..8e3bf46c3 100644 --- a/src/components/MDX/DiagramGroup.tsx +++ b/src/components/MDX/DiagramGroup.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/ErrorDecoder.tsx b/src/components/MDX/ErrorDecoder.tsx index a9b7455df..423790198 100644 --- a/src/components/MDX/ErrorDecoder.tsx +++ b/src/components/MDX/ErrorDecoder.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + import {useEffect, useState} from 'react'; import {useErrorDecoderParams} from '../ErrorDecoderContext'; import cn from 'classnames'; diff --git a/src/components/MDX/ExpandableCallout.tsx b/src/components/MDX/ExpandableCallout.tsx index 41d3d65d9..ba93d3e27 100644 --- a/src/components/MDX/ExpandableCallout.tsx +++ b/src/components/MDX/ExpandableCallout.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/ExpandableExample.tsx b/src/components/MDX/ExpandableExample.tsx index 1e709e483..c11cd6c3c 100644 --- a/src/components/MDX/ExpandableExample.tsx +++ b/src/components/MDX/ExpandableExample.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Heading.tsx b/src/components/MDX/Heading.tsx index a9f3efc38..5890a3a48 100644 --- a/src/components/MDX/Heading.tsx +++ b/src/components/MDX/Heading.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/InlineCode.tsx b/src/components/MDX/InlineCode.tsx index 5759a7c0a..17e4683b9 100644 --- a/src/components/MDX/InlineCode.tsx +++ b/src/components/MDX/InlineCode.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Intro.tsx b/src/components/MDX/Intro.tsx index 0522df678..b0bee624d 100644 --- a/src/components/MDX/Intro.tsx +++ b/src/components/MDX/Intro.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/LanguagesContext.tsx b/src/components/MDX/LanguagesContext.tsx index 776a11c0d..cd9f88816 100644 --- a/src/components/MDX/LanguagesContext.tsx +++ b/src/components/MDX/LanguagesContext.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Link.tsx b/src/components/MDX/Link.tsx index 7bf041e56..8a47c401f 100644 --- a/src/components/MDX/Link.tsx +++ b/src/components/MDX/Link.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/MDXComponents.tsx b/src/components/MDX/MDXComponents.tsx index afcb9c265..7a258370c 100644 --- a/src/components/MDX/MDXComponents.tsx +++ b/src/components/MDX/MDXComponents.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/PackageImport.tsx b/src/components/MDX/PackageImport.tsx index 5e2da820e..222353ff5 100644 --- a/src/components/MDX/PackageImport.tsx +++ b/src/components/MDX/PackageImport.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Recap.tsx b/src/components/MDX/Recap.tsx index d91ed48b4..293304367 100644 --- a/src/components/MDX/Recap.tsx +++ b/src/components/MDX/Recap.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/ClearButton.tsx b/src/components/MDX/Sandpack/ClearButton.tsx index 868f9fb66..be7451ab3 100644 --- a/src/components/MDX/Sandpack/ClearButton.tsx +++ b/src/components/MDX/Sandpack/ClearButton.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/Console.tsx b/src/components/MDX/Sandpack/Console.tsx index b5276fc13..3417e11f1 100644 --- a/src/components/MDX/Sandpack/Console.tsx +++ b/src/components/MDX/Sandpack/Console.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/CustomPreset.tsx b/src/components/MDX/Sandpack/CustomPreset.tsx index 7d6e566d2..4a241c87c 100644 --- a/src/components/MDX/Sandpack/CustomPreset.tsx +++ b/src/components/MDX/Sandpack/CustomPreset.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/DownloadButton.tsx b/src/components/MDX/Sandpack/DownloadButton.tsx index 94cf13ddc..b51627d89 100644 --- a/src/components/MDX/Sandpack/DownloadButton.tsx +++ b/src/components/MDX/Sandpack/DownloadButton.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/ErrorMessage.tsx b/src/components/MDX/Sandpack/ErrorMessage.tsx index 7c67ee461..3dbeb113b 100644 --- a/src/components/MDX/Sandpack/ErrorMessage.tsx +++ b/src/components/MDX/Sandpack/ErrorMessage.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/LoadingOverlay.tsx b/src/components/MDX/Sandpack/LoadingOverlay.tsx index de883629c..1945f0c6f 100644 --- a/src/components/MDX/Sandpack/LoadingOverlay.tsx +++ b/src/components/MDX/Sandpack/LoadingOverlay.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + import {useState} from 'react'; import { diff --git a/src/components/MDX/Sandpack/NavigationBar.tsx b/src/components/MDX/Sandpack/NavigationBar.tsx index d115868dd..3fe743a2d 100644 --- a/src/components/MDX/Sandpack/NavigationBar.tsx +++ b/src/components/MDX/Sandpack/NavigationBar.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/OpenInCodeSandboxButton.tsx b/src/components/MDX/Sandpack/OpenInCodeSandboxButton.tsx index a27122ed6..83b968fab 100644 --- a/src/components/MDX/Sandpack/OpenInCodeSandboxButton.tsx +++ b/src/components/MDX/Sandpack/OpenInCodeSandboxButton.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/OpenInTypeScriptPlayground.tsx b/src/components/MDX/Sandpack/OpenInTypeScriptPlayground.tsx index 7284912e3..ca0286530 100644 --- a/src/components/MDX/Sandpack/OpenInTypeScriptPlayground.tsx +++ b/src/components/MDX/Sandpack/OpenInTypeScriptPlayground.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/Preview.tsx b/src/components/MDX/Sandpack/Preview.tsx index e4fe0afe4..ead9341b6 100644 --- a/src/components/MDX/Sandpack/Preview.tsx +++ b/src/components/MDX/Sandpack/Preview.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/ReloadButton.tsx b/src/components/MDX/Sandpack/ReloadButton.tsx index f828a6c2d..71a25ea47 100644 --- a/src/components/MDX/Sandpack/ReloadButton.tsx +++ b/src/components/MDX/Sandpack/ReloadButton.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/SandpackRoot.tsx b/src/components/MDX/Sandpack/SandpackRoot.tsx index 67f40d0b3..48d8daee5 100644 --- a/src/components/MDX/Sandpack/SandpackRoot.tsx +++ b/src/components/MDX/Sandpack/SandpackRoot.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/Themes.tsx b/src/components/MDX/Sandpack/Themes.tsx index 3923470ca..8aa34dc95 100644 --- a/src/components/MDX/Sandpack/Themes.tsx +++ b/src/components/MDX/Sandpack/Themes.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/createFileMap.ts b/src/components/MDX/Sandpack/createFileMap.ts index 193b07be8..323f936e7 100644 --- a/src/components/MDX/Sandpack/createFileMap.ts +++ b/src/components/MDX/Sandpack/createFileMap.ts @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/index.tsx b/src/components/MDX/Sandpack/index.tsx index 6755ba8de..08e7dd6f0 100644 --- a/src/components/MDX/Sandpack/index.tsx +++ b/src/components/MDX/Sandpack/index.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/Sandpack/runESLint.tsx b/src/components/MDX/Sandpack/runESLint.tsx index 5fea2f110..a0b835461 100644 --- a/src/components/MDX/Sandpack/runESLint.tsx +++ b/src/components/MDX/Sandpack/runESLint.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + // @ts-nocheck import {Linter} from 'eslint/lib/linter/linter'; diff --git a/src/components/MDX/Sandpack/template.ts b/src/components/MDX/Sandpack/template.ts index dd6fd12bd..358c8616e 100644 --- a/src/components/MDX/Sandpack/template.ts +++ b/src/components/MDX/Sandpack/template.ts @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + export const template = { '/src/index.js': { hidden: true, diff --git a/src/components/MDX/Sandpack/useSandpackLint.tsx b/src/components/MDX/Sandpack/useSandpackLint.tsx index ec05fbe0d..479b53ee0 100644 --- a/src/components/MDX/Sandpack/useSandpackLint.tsx +++ b/src/components/MDX/Sandpack/useSandpackLint.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/SandpackWithHTMLOutput.tsx b/src/components/MDX/SandpackWithHTMLOutput.tsx index 51ce28dc1..c5149deb9 100644 --- a/src/components/MDX/SandpackWithHTMLOutput.tsx +++ b/src/components/MDX/SandpackWithHTMLOutput.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + import {Children, memo} from 'react'; import InlineCode from './InlineCode'; import Sandpack from './Sandpack'; diff --git a/src/components/MDX/SimpleCallout.tsx b/src/components/MDX/SimpleCallout.tsx index ae259bcf5..0e124baa7 100644 --- a/src/components/MDX/SimpleCallout.tsx +++ b/src/components/MDX/SimpleCallout.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/TeamMember.tsx b/src/components/MDX/TeamMember.tsx index 2c2fffa73..2d0c65537 100644 --- a/src/components/MDX/TeamMember.tsx +++ b/src/components/MDX/TeamMember.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/TerminalBlock.tsx b/src/components/MDX/TerminalBlock.tsx index 475292716..bdcd8e466 100644 --- a/src/components/MDX/TerminalBlock.tsx +++ b/src/components/MDX/TerminalBlock.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/TocContext.tsx b/src/components/MDX/TocContext.tsx index 8aeead370..924e6e09e 100644 --- a/src/components/MDX/TocContext.tsx +++ b/src/components/MDX/TocContext.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/MDX/YouWillLearnCard.tsx b/src/components/MDX/YouWillLearnCard.tsx index d46a70277..20fc3b5fe 100644 --- a/src/components/MDX/YouWillLearnCard.tsx +++ b/src/components/MDX/YouWillLearnCard.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/PageHeading.tsx b/src/components/PageHeading.tsx index 3f15afe95..760542750 100644 --- a/src/components/PageHeading.tsx +++ b/src/components/PageHeading.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Search.tsx b/src/components/Search.tsx index c7401487b..24b066d70 100644 --- a/src/components/Search.tsx +++ b/src/components/Search.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/Seo.tsx b/src/components/Seo.tsx index b8a8394b6..906041020 100644 --- a/src/components/Seo.tsx +++ b/src/components/Seo.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/components/SocialBanner.tsx b/src/components/SocialBanner.tsx index ae87d2050..4e404adcf 100644 --- a/src/components/SocialBanner.tsx +++ b/src/components/SocialBanner.tsx @@ -1,6 +1,8 @@ /** - * Copyright (c) Facebook, Inc. and its affiliates. + * Copyright (c) Meta Platforms, Inc. and affiliates. * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. */ import {useRef, useEffect} from 'react'; diff --git a/src/components/Tag.tsx b/src/components/Tag.tsx index 2e63a81f6..9a69d179c 100644 --- a/src/components/Tag.tsx +++ b/src/components/Tag.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/hooks/usePendingRoute.ts b/src/hooks/usePendingRoute.ts index 229a36e64..17d7525b4 100644 --- a/src/hooks/usePendingRoute.ts +++ b/src/hooks/usePendingRoute.ts @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/pages/404.js b/src/pages/404.js index 2a88fc29a..2b5a83baf 100644 --- a/src/pages/404.js +++ b/src/pages/404.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/pages/500.js b/src/pages/500.js index b043e35b2..552dcf77b 100644 --- a/src/pages/500.js +++ b/src/pages/500.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/pages/[[...markdownPath]].js b/src/pages/[[...markdownPath]].js index bef4508df..cb2e23a38 100644 --- a/src/pages/[[...markdownPath]].js +++ b/src/pages/[[...markdownPath]].js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/pages/_app.tsx b/src/pages/_app.tsx index 5431f87cc..80a0a0f86 100644 --- a/src/pages/_app.tsx +++ b/src/pages/_app.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/pages/_document.tsx b/src/pages/_document.tsx index 6849df35d..21b6f4d4f 100644 --- a/src/pages/_document.tsx +++ b/src/pages/_document.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/pages/errors/[errorCode].tsx b/src/pages/errors/[errorCode].tsx index c8cf28ad8..67466a1d9 100644 --- a/src/pages/errors/[errorCode].tsx +++ b/src/pages/errors/[errorCode].tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + import {Fragment, useMemo} from 'react'; import {Page} from 'components/Layout/Page'; import {MDXComponents} from 'components/MDX/MDXComponents'; diff --git a/src/pages/errors/index.tsx b/src/pages/errors/index.tsx index d7742f03a..0c154039c 100644 --- a/src/pages/errors/index.tsx +++ b/src/pages/errors/index.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + import ErrorDecoderPage from './[errorCode]'; export default ErrorDecoderPage; export {getStaticProps} from './[errorCode]'; diff --git a/src/siteConfig.js b/src/siteConfig.js index e731dcec4..a43fbf5fc 100644 --- a/src/siteConfig.js +++ b/src/siteConfig.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/types/docsearch-react-modal.d.ts b/src/types/docsearch-react-modal.d.ts index 568ffed80..f169f0364 100644 --- a/src/types/docsearch-react-modal.d.ts +++ b/src/types/docsearch-react-modal.d.ts @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/utils/analytics.ts b/src/utils/analytics.ts index c2cc623b9..bd5b5f600 100644 --- a/src/utils/analytics.ts +++ b/src/utils/analytics.ts @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/utils/compileMDX.ts b/src/utils/compileMDX.ts index be770c29a..807b50da5 100644 --- a/src/utils/compileMDX.ts +++ b/src/utils/compileMDX.ts @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + import {LanguageItem} from 'components/MDX/LanguagesContext'; import {MDXComponents} from 'components/MDX/MDXComponents'; diff --git a/src/utils/finishedTranslations.ts b/src/utils/finishedTranslations.ts index 6f509f0b5..1bd55637a 100644 --- a/src/utils/finishedTranslations.ts +++ b/src/utils/finishedTranslations.ts @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + // This is a list of languages with enough translated content. // Add more languages here when they have enough content. // Please DO NOT edit this list without a discussion in the reactjs/react.dev repo. diff --git a/src/utils/forwardRefWithAs.tsx b/src/utils/forwardRefWithAs.tsx index 8f8282ab1..c5975c199 100644 --- a/src/utils/forwardRefWithAs.tsx +++ b/src/utils/forwardRefWithAs.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/utils/prepareMDX.js b/src/utils/prepareMDX.js index 20a22577d..5ad0a64b0 100644 --- a/src/utils/prepareMDX.js +++ b/src/utils/prepareMDX.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/utils/processShim.js b/src/utils/processShim.js index 7d8454988..915a9ea33 100644 --- a/src/utils/processShim.js +++ b/src/utils/processShim.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/utils/rafShim.js b/src/utils/rafShim.js index 9c3097d8f..f4984da83 100644 --- a/src/utils/rafShim.js +++ b/src/utils/rafShim.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/utils/rss.js b/src/utils/rss.js index 29e5511ea..82764351c 100644 --- a/src/utils/rss.js +++ b/src/utils/rss.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/src/utils/toCommaSeparatedList.tsx b/src/utils/toCommaSeparatedList.tsx index e95ee1799..affa1970a 100644 --- a/src/utils/toCommaSeparatedList.tsx +++ b/src/utils/toCommaSeparatedList.tsx @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ diff --git a/tailwind.config.js b/tailwind.config.js index f31a24516..9450cfa59 100644 --- a/tailwind.config.js +++ b/tailwind.config.js @@ -1,3 +1,10 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + /* * Copyright (c) Facebook, Inc. and its affiliates. */ From b6a32d1e0e1145a58d422811674beae478b8ca40 Mon Sep 17 00:00:00 2001 From: lauren Date: Thu, 18 Sep 2025 15:32:18 -0400 Subject: [PATCH 04/15] Add local eslint rule to validate markdown codeblocks with React Compiler (#7988) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In https://github.com/facebook/react/pull/34462 for example, we found an issue where the compiler was incorrectly validating an example straight from the docs. In order to find more issues like this + also provide more feedback to doc authors on valid/invalid patterns, this PR adds a new local eslint rule which validates all markdown codeblocks containing components/hooks with React Compiler. An autofixer is also provided. To express that a codeblock has an expected error, we can use the following metadata: ```ts // pseudo type def type MarkdownCodeBlockMetadata = { expectedErrors?: { 'react-compiler'?: number[]; }; }; ``` and can be used like so: ```` ```js {expectedErrors: {'react-compiler': [4]}} // ❌ setState directly in render function Component({value}) { const [count, setCount] = useState(0); setCount(value); // error on L4 return
{count}
; } ``` ```` Because this is defined as a local rule, we don't have the same granular reporting that `eslint-plugin-react-hooks` yet. I can look into that later but for now this first PR just sets us up with something basic. --- .eslintrc | 24 +- .github/workflows/site_lint.yml | 3 + .gitignore | 2 +- .../fixtures/src/content/basic-error.md | 8 + .../src/content/duplicate-metadata.md | 8 + .../src/content/malformed-metadata.md | 8 + .../fixtures/src/content/mixed-language.md | 7 + .../src/content/stale-expected-error.md | 5 + .../fixtures/src/content/suppressed-error.md | 8 + .../lint-markdown-code-blocks.test.js | 131 ++ eslint-local-rules/index.js | 14 + eslint-local-rules/package.json | 12 + eslint-local-rules/parser.js | 8 + eslint-local-rules/rules/diagnostics.js | 77 + .../rules/lint-markdown-code-blocks.js | 178 +++ eslint-local-rules/rules/markdown.js | 124 ++ eslint-local-rules/rules/metadata.js | 377 +++++ eslint-local-rules/rules/react-compiler.js | 122 ++ eslint-local-rules/yarn.lock | 1421 +++++++++++++++++ package.json | 8 +- yarn.lock | 4 + 21 files changed, 2542 insertions(+), 7 deletions(-) create mode 100644 eslint-local-rules/__tests__/fixtures/src/content/basic-error.md create mode 100644 eslint-local-rules/__tests__/fixtures/src/content/duplicate-metadata.md create mode 100644 eslint-local-rules/__tests__/fixtures/src/content/malformed-metadata.md create mode 100644 eslint-local-rules/__tests__/fixtures/src/content/mixed-language.md create mode 100644 eslint-local-rules/__tests__/fixtures/src/content/stale-expected-error.md create mode 100644 eslint-local-rules/__tests__/fixtures/src/content/suppressed-error.md create mode 100644 eslint-local-rules/__tests__/lint-markdown-code-blocks.test.js create mode 100644 eslint-local-rules/index.js create mode 100644 eslint-local-rules/package.json create mode 100644 eslint-local-rules/parser.js create mode 100644 eslint-local-rules/rules/diagnostics.js create mode 100644 eslint-local-rules/rules/lint-markdown-code-blocks.js create mode 100644 eslint-local-rules/rules/markdown.js create mode 100644 eslint-local-rules/rules/metadata.js create mode 100644 eslint-local-rules/rules/react-compiler.js create mode 100644 eslint-local-rules/yarn.lock diff --git a/.eslintrc b/.eslintrc index f8b03f98a..7bc6ab933 100644 --- a/.eslintrc +++ b/.eslintrc @@ -2,18 +2,36 @@ "root": true, "extends": "next/core-web-vitals", "parser": "@typescript-eslint/parser", - "plugins": ["@typescript-eslint", "eslint-plugin-react-compiler"], + "plugins": ["@typescript-eslint", "eslint-plugin-react-compiler", "local-rules"], "rules": { "no-unused-vars": "off", "@typescript-eslint/no-unused-vars": ["error", {"varsIgnorePattern": "^_"}], "react-hooks/exhaustive-deps": "error", "react/no-unknown-property": ["error", {"ignore": ["meta"]}], - "react-compiler/react-compiler": "error" + "react-compiler/react-compiler": "error", + "local-rules/lint-markdown-code-blocks": "error" }, "env": { "node": true, "commonjs": true, "browser": true, "es6": true - } + }, + "overrides": [ + { + "files": ["src/content/**/*.md"], + "parser": "./eslint-local-rules/parser", + "parserOptions": { + "sourceType": "module" + }, + "rules": { + "no-unused-vars": "off", + "@typescript-eslint/no-unused-vars": "off", + "react-hooks/exhaustive-deps": "off", + "react/no-unknown-property": "off", + "react-compiler/react-compiler": "off", + "local-rules/lint-markdown-code-blocks": "error" + } + } + ] } diff --git a/.github/workflows/site_lint.yml b/.github/workflows/site_lint.yml index 81a04601c..dc0e1fb20 100644 --- a/.github/workflows/site_lint.yml +++ b/.github/workflows/site_lint.yml @@ -32,6 +32,9 @@ jobs: - name: Install deps run: yarn install --frozen-lockfile + - name: Install deps (eslint-local-rules) + run: yarn install --frozen-lockfile + working-directory: eslint-local-rules - name: Lint codebase run: yarn ci-check diff --git a/.gitignore b/.gitignore index 7bf71dbc5..99f4615e5 100644 --- a/.gitignore +++ b/.gitignore @@ -1,7 +1,7 @@ # See https://help.github.com/articles/ignoring-files/ for more about ignoring files. # dependencies -/node_modules +node_modules /.pnp .pnp.js diff --git a/eslint-local-rules/__tests__/fixtures/src/content/basic-error.md b/eslint-local-rules/__tests__/fixtures/src/content/basic-error.md new file mode 100644 index 000000000..8e7670fdc --- /dev/null +++ b/eslint-local-rules/__tests__/fixtures/src/content/basic-error.md @@ -0,0 +1,8 @@ +```jsx +import {useState} from 'react'; +function Counter() { + const [count, setCount] = useState(0); + setCount(count + 1); + return
{count}
; +} +``` diff --git a/eslint-local-rules/__tests__/fixtures/src/content/duplicate-metadata.md b/eslint-local-rules/__tests__/fixtures/src/content/duplicate-metadata.md new file mode 100644 index 000000000..67d6b62bb --- /dev/null +++ b/eslint-local-rules/__tests__/fixtures/src/content/duplicate-metadata.md @@ -0,0 +1,8 @@ +```jsx title="Counter" {expectedErrors: {'react-compiler': [99]}} {expectedErrors: {'react-compiler': [2]}} +import {useState} from 'react'; +function Counter() { + const [count, setCount] = useState(0); + setCount(count + 1); + return
{count}
; +} +``` diff --git a/eslint-local-rules/__tests__/fixtures/src/content/malformed-metadata.md b/eslint-local-rules/__tests__/fixtures/src/content/malformed-metadata.md new file mode 100644 index 000000000..fd542bf03 --- /dev/null +++ b/eslint-local-rules/__tests__/fixtures/src/content/malformed-metadata.md @@ -0,0 +1,8 @@ +```jsx {expectedErrors: {'react-compiler': 'invalid'}} +import {useState} from 'react'; +function Counter() { + const [count, setCount] = useState(0); + setCount(count + 1); + return
{count}
; +} +``` diff --git a/eslint-local-rules/__tests__/fixtures/src/content/mixed-language.md b/eslint-local-rules/__tests__/fixtures/src/content/mixed-language.md new file mode 100644 index 000000000..313b0e30f --- /dev/null +++ b/eslint-local-rules/__tests__/fixtures/src/content/mixed-language.md @@ -0,0 +1,7 @@ +```bash +setCount() +``` + +```txt +import {useState} from 'react'; +``` diff --git a/eslint-local-rules/__tests__/fixtures/src/content/stale-expected-error.md b/eslint-local-rules/__tests__/fixtures/src/content/stale-expected-error.md new file mode 100644 index 000000000..46e330ac0 --- /dev/null +++ b/eslint-local-rules/__tests__/fixtures/src/content/stale-expected-error.md @@ -0,0 +1,5 @@ +```jsx {expectedErrors: {'react-compiler': [3]}} +function Hello() { + return

Hello

; +} +``` diff --git a/eslint-local-rules/__tests__/fixtures/src/content/suppressed-error.md b/eslint-local-rules/__tests__/fixtures/src/content/suppressed-error.md new file mode 100644 index 000000000..ecefa8495 --- /dev/null +++ b/eslint-local-rules/__tests__/fixtures/src/content/suppressed-error.md @@ -0,0 +1,8 @@ +```jsx {expectedErrors: {'react-compiler': [4]}} +import {useState} from 'react'; +function Counter() { + const [count, setCount] = useState(0); + setCount(count + 1); + return
{count}
; +} +``` diff --git a/eslint-local-rules/__tests__/lint-markdown-code-blocks.test.js b/eslint-local-rules/__tests__/lint-markdown-code-blocks.test.js new file mode 100644 index 000000000..250e0a1e5 --- /dev/null +++ b/eslint-local-rules/__tests__/lint-markdown-code-blocks.test.js @@ -0,0 +1,131 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + +const assert = require('assert'); +const fs = require('fs'); +const path = require('path'); +const {ESLint} = require('eslint'); +const plugin = require('..'); + +const FIXTURES_DIR = path.join( + __dirname, + 'fixtures', + 'src', + 'content' +); +const PARSER_PATH = path.join(__dirname, '..', 'parser.js'); + +function createESLint({fix = false} = {}) { + return new ESLint({ + useEslintrc: false, + fix, + plugins: { + 'local-rules': plugin, + }, + overrideConfig: { + parser: PARSER_PATH, + plugins: ['local-rules'], + rules: { + 'local-rules/lint-markdown-code-blocks': 'error', + }, + parserOptions: { + sourceType: 'module', + }, + }, + }); +} + +function readFixture(name) { + return fs.readFileSync(path.join(FIXTURES_DIR, name), 'utf8'); +} + +async function lintFixture(name, {fix = false} = {}) { + const eslint = createESLint({fix}); + const filePath = path.join(FIXTURES_DIR, name); + const markdown = readFixture(name); + const [result] = await eslint.lintText(markdown, {filePath}); + return result; +} + +async function run() { + const basicResult = await lintFixture('basic-error.md'); + assert.strictEqual( + basicResult.messages.length, + 1, + 'expected one diagnostic' + ); + assert( + basicResult.messages[0].message.includes('Calling setState during render'), + 'expected message to mention setState during render' + ); + + const suppressedResult = await lintFixture('suppressed-error.md'); + assert.strictEqual( + suppressedResult.messages.length, + 0, + 'expected suppression metadata to silence diagnostic' + ); + + const staleResult = await lintFixture('stale-expected-error.md'); + assert.strictEqual( + staleResult.messages.length, + 1, + 'expected stale metadata error' + ); + assert.strictEqual( + staleResult.messages[0].message, + 'React Compiler expected error on line 3 was not triggered' + ); + + const duplicateResult = await lintFixture('duplicate-metadata.md'); + assert.strictEqual( + duplicateResult.messages.length, + 2, + 'expected duplicate metadata to surface compiler diagnostic and stale metadata notice' + ); + const duplicateFixed = await lintFixture('duplicate-metadata.md', { + fix: true, + }); + assert( + duplicateFixed.output.includes( + "{expectedErrors: {'react-compiler': [4]}}" + ), + 'expected duplicates to be rewritten to a single canonical block' + ); + assert( + !duplicateFixed.output.includes('[99]'), + 'expected stale line numbers to be removed from metadata' + ); + + const mixedLanguageResult = await lintFixture('mixed-language.md'); + assert.strictEqual( + mixedLanguageResult.messages.length, + 0, + 'expected non-js code fences to be ignored' + ); + + const malformedResult = await lintFixture('malformed-metadata.md'); + assert.strictEqual( + malformedResult.messages.length, + 1, + 'expected malformed metadata to fall back to compiler diagnostics' + ); + const malformedFixed = await lintFixture('malformed-metadata.md', { + fix: true, + }); + assert( + malformedFixed.output.includes( + "{expectedErrors: {'react-compiler': [4]}}" + ), + 'expected malformed metadata to be replaced with canonical form' + ); +} + +run().catch(error => { + console.error(error); + process.exitCode = 1; +}); diff --git a/eslint-local-rules/index.js b/eslint-local-rules/index.js new file mode 100644 index 000000000..b1f747ccb --- /dev/null +++ b/eslint-local-rules/index.js @@ -0,0 +1,14 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + +const lintMarkdownCodeBlocks = require('./rules/lint-markdown-code-blocks'); + +module.exports = { + rules: { + 'lint-markdown-code-blocks': lintMarkdownCodeBlocks, + }, +}; diff --git a/eslint-local-rules/package.json b/eslint-local-rules/package.json new file mode 100644 index 000000000..9940fee20 --- /dev/null +++ b/eslint-local-rules/package.json @@ -0,0 +1,12 @@ +{ + "name": "eslint-plugin-local-rules", + "version": "0.0.0", + "main": "index.js", + "private": "true", + "scripts": { + "test": "node __tests__/lint-markdown-code-blocks.test.js" + }, + "devDependencies": { + "eslint-mdx": "^2" + } +} diff --git a/eslint-local-rules/parser.js b/eslint-local-rules/parser.js new file mode 100644 index 000000000..043f2e520 --- /dev/null +++ b/eslint-local-rules/parser.js @@ -0,0 +1,8 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + +module.exports = require('eslint-mdx'); diff --git a/eslint-local-rules/rules/diagnostics.js b/eslint-local-rules/rules/diagnostics.js new file mode 100644 index 000000000..4e433164b --- /dev/null +++ b/eslint-local-rules/rules/diagnostics.js @@ -0,0 +1,77 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + +function getRelativeLine(loc) { + return loc?.start?.line ?? loc?.line ?? 1; +} + +function getRelativeColumn(loc) { + return loc?.start?.column ?? loc?.column ?? 0; +} + +function getRelativeEndLine(loc, fallbackLine) { + if (loc?.end?.line != null) { + return loc.end.line; + } + if (loc?.line != null) { + return loc.line; + } + return fallbackLine; +} + +function getRelativeEndColumn(loc, fallbackColumn) { + if (loc?.end?.column != null) { + return loc.end.column; + } + if (loc?.column != null) { + return loc.column; + } + return fallbackColumn; +} + +/** + * @param {import('./markdown').MarkdownCodeBlock} block + * @param {Array<{detail: any, loc: any, message: string}>} diagnostics + * @returns {Array<{detail: any, message: string, relativeStartLine: number, markdownLoc: {start: {line: number, column: number}, end: {line: number, column: number}}}>} + */ +function normalizeDiagnostics(block, diagnostics) { + return diagnostics.map(({detail, loc, message}) => { + const relativeStartLine = Math.max(getRelativeLine(loc), 1); + const relativeStartColumn = Math.max(getRelativeColumn(loc), 0); + const relativeEndLine = Math.max( + getRelativeEndLine(loc, relativeStartLine), + relativeStartLine + ); + const relativeEndColumn = Math.max( + getRelativeEndColumn(loc, relativeStartColumn), + relativeStartColumn + ); + + const markdownStartLine = block.codeStartLine + relativeStartLine - 1; + const markdownEndLine = block.codeStartLine + relativeEndLine - 1; + + return { + detail, + message, + relativeStartLine, + markdownLoc: { + start: { + line: markdownStartLine, + column: relativeStartColumn, + }, + end: { + line: markdownEndLine, + column: relativeEndColumn, + }, + }, + }; + }); +} + +module.exports = { + normalizeDiagnostics, +}; diff --git a/eslint-local-rules/rules/lint-markdown-code-blocks.js b/eslint-local-rules/rules/lint-markdown-code-blocks.js new file mode 100644 index 000000000..5ec327947 --- /dev/null +++ b/eslint-local-rules/rules/lint-markdown-code-blocks.js @@ -0,0 +1,178 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + +const { + buildFenceLine, + getCompilerExpectedLines, + getSortedUniqueNumbers, + hasCompilerEntry, + metadataEquals, + metadataHasExpectedErrorsToken, + removeCompilerExpectedLines, + setCompilerExpectedLines, +} = require('./metadata'); +const {normalizeDiagnostics} = require('./diagnostics'); +const {parseMarkdownFile} = require('./markdown'); +const {runReactCompiler} = require('./react-compiler'); + +module.exports = { + meta: { + type: 'problem', + docs: { + description: 'Run React Compiler on markdown code blocks', + category: 'Possible Errors', + }, + fixable: 'code', + hasSuggestions: true, + schema: [], + }, + + create(context) { + return { + Program(node) { + const filename = context.getFilename(); + if (!filename.endsWith('.md') || !filename.includes('src/content')) { + return; + } + + const sourceCode = context.getSourceCode(); + const {blocks} = parseMarkdownFile(sourceCode.text, filename); + // For each supported code block, run the compiler and reconcile metadata. + for (const block of blocks) { + const compilerResult = runReactCompiler( + block.code, + `${filename}#codeblock` + ); + + const expectedLines = getCompilerExpectedLines(block.metadata); + const expectedLineSet = new Set(expectedLines); + const diagnostics = normalizeDiagnostics( + block, + compilerResult.diagnostics + ); + + const errorLines = new Set(); + const unexpectedDiagnostics = []; + + for (const diagnostic of diagnostics) { + const line = diagnostic.relativeStartLine; + errorLines.add(line); + if (!expectedLineSet.has(line)) { + unexpectedDiagnostics.push(diagnostic); + } + } + + const normalizedErrorLines = getSortedUniqueNumbers( + Array.from(errorLines) + ); + const missingExpectedLines = expectedLines.filter( + (line) => !errorLines.has(line) + ); + + const desiredMetadata = normalizedErrorLines.length + ? setCompilerExpectedLines(block.metadata, normalizedErrorLines) + : removeCompilerExpectedLines(block.metadata); + + // Compute canonical metadata and attach an autofix when it differs. + const metadataChanged = !metadataEquals( + block.metadata, + desiredMetadata + ); + const replacementLine = buildFenceLine(block.lang, desiredMetadata); + const replacementDiffers = block.fence.rawText !== replacementLine; + const applyReplacementFix = replacementDiffers + ? (fixer) => + fixer.replaceTextRange(block.fence.range, replacementLine) + : null; + + const hasDuplicateMetadata = + block.metadata.hadDuplicateExpectedErrors; + const hasExpectedErrorsMetadata = metadataHasExpectedErrorsToken( + block.metadata + ); + + const shouldFixUnexpected = + Boolean(applyReplacementFix) && + normalizedErrorLines.length > 0 && + (metadataChanged || + hasDuplicateMetadata || + !hasExpectedErrorsMetadata); + + let fixAlreadyAttached = false; + + for (const diagnostic of unexpectedDiagnostics) { + const reportData = { + node, + loc: diagnostic.markdownLoc, + message: diagnostic.message, + }; + + if ( + shouldFixUnexpected && + applyReplacementFix && + !fixAlreadyAttached + ) { + reportData.fix = applyReplacementFix; + reportData.suggest = [ + { + desc: 'Add expectedErrors metadata to suppress these errors', + fix: applyReplacementFix, + }, + ]; + fixAlreadyAttached = true; + } + + context.report(reportData); + } + + // Assert that expectedErrors is actually needed + if ( + Boolean(applyReplacementFix) && + missingExpectedLines.length > 0 && + hasCompilerEntry(block.metadata) + ) { + const plural = missingExpectedLines.length > 1; + const message = plural + ? `React Compiler expected errors on lines ${missingExpectedLines.join( + ', ' + )} were not triggered` + : `React Compiler expected error on line ${missingExpectedLines[0]} was not triggered`; + + const reportData = { + node, + loc: { + start: { + line: block.position.start.line, + column: 0, + }, + end: { + line: block.position.start.line, + column: block.fence.rawText.length, + }, + }, + message, + }; + + if (!fixAlreadyAttached && applyReplacementFix) { + reportData.fix = applyReplacementFix; + fixAlreadyAttached = true; + } else if (applyReplacementFix) { + reportData.suggest = [ + { + desc: 'Remove stale expectedErrors metadata', + fix: applyReplacementFix, + }, + ]; + } + + context.report(reportData); + } + } + }, + }; + }, +}; diff --git a/eslint-local-rules/rules/markdown.js b/eslint-local-rules/rules/markdown.js new file mode 100644 index 000000000..d888d1311 --- /dev/null +++ b/eslint-local-rules/rules/markdown.js @@ -0,0 +1,124 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + +const remark = require('remark'); +const {parseFenceMetadata} = require('./metadata'); + +/** + * @typedef {Object} MarkdownCodeBlock + * @property {string} code + * @property {number} codeStartLine + * @property {{start: {line: number, column: number}, end: {line: number, column: number}}} position + * @property {{lineIndex: number, rawText: string, metaText: string, range: [number, number]}} fence + * @property {string} filePath + * @property {string} lang + * @property {import('./metadata').FenceMetadata} metadata + */ + +const SUPPORTED_LANGUAGES = new Set([ + 'js', + 'jsx', + 'javascript', + 'ts', + 'tsx', + 'typescript', +]); + +function computeLineOffsets(lines) { + const offsets = []; + let currentOffset = 0; + + for (const line of lines) { + offsets.push(currentOffset); + currentOffset += line.length + 1; + } + + return offsets; +} + +function parseMarkdownFile(content, filePath) { + const tree = remark().parse(content); + const lines = content.split('\n'); + const lineOffsets = computeLineOffsets(lines); + const blocks = []; + + function traverse(node) { + if (!node || typeof node !== 'object') { + return; + } + + if (node.type === 'code') { + const rawLang = node.lang || ''; + const normalizedLang = rawLang.toLowerCase(); + if (!normalizedLang || !SUPPORTED_LANGUAGES.has(normalizedLang)) { + return; + } + + const fenceLineIndex = (node.position?.start?.line ?? 1) - 1; + const fenceStartOffset = node.position?.start?.offset ?? 0; + const fenceLine = lines[fenceLineIndex] ?? ''; + const fenceEndOffset = fenceStartOffset + fenceLine.length; + + let metaText = ''; + if (fenceLine) { + const prefixMatch = fenceLine.match(/^`{3,}\s*/); + const prefixLength = prefixMatch ? prefixMatch[0].length : 3; + metaText = fenceLine.slice(prefixLength + rawLang.length); + } else if (node.meta) { + metaText = ` ${node.meta}`; + } + + const metadata = parseFenceMetadata(metaText); + + blocks.push({ + lang: rawLang || normalizedLang, + metadata, + filePath, + code: node.value || '', + codeStartLine: (node.position?.start?.line ?? 1) + 1, + position: { + start: { + line: fenceLineIndex + 1, + column: (node.position?.start?.column ?? 1) - 1, + }, + end: { + line: fenceLineIndex + 1, + column: (node.position?.start?.column ?? 1) - 1 + fenceLine.length, + }, + }, + fence: { + lineIndex: fenceLineIndex, + rawText: fenceLine, + metaText, + range: [fenceStartOffset, fenceEndOffset], + }, + }); + return; + } + + if ('children' in node && Array.isArray(node.children)) { + for (const child of node.children) { + traverse(child); + } + } + } + + traverse(tree); + + return { + content, + blocks, + lines, + lineOffsets, + }; +} + +module.exports = { + SUPPORTED_LANGUAGES, + computeLineOffsets, + parseMarkdownFile, +}; diff --git a/eslint-local-rules/rules/metadata.js b/eslint-local-rules/rules/metadata.js new file mode 100644 index 000000000..fb58a37c2 --- /dev/null +++ b/eslint-local-rules/rules/metadata.js @@ -0,0 +1,377 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + +/** + * @typedef {{type: 'text', raw: string}} TextToken + * @typedef {{ + * type: 'expectedErrors', + * entries: Record>, + * raw?: string, + * }} ExpectedErrorsToken + * @typedef {TextToken | ExpectedErrorsToken} MetadataToken + * + * @typedef {{ + * leading: string, + * trailing: string, + * tokens: Array, + * parseError: boolean, + * hadDuplicateExpectedErrors: boolean, + * }} FenceMetadata + */ + +const EXPECTED_ERRORS_BLOCK_REGEX = /\{\s*expectedErrors\s*:/; +const REACT_COMPILER_KEY = 'react-compiler'; + +function getSortedUniqueNumbers(values) { + return Array.from(new Set(values)) + .filter((value) => typeof value === 'number' && !Number.isNaN(value)) + .sort((a, b) => a - b); +} + +function tokenizeMeta(body) { + if (!body) { + return []; + } + + const tokens = []; + let current = ''; + let depth = 0; + + for (let i = 0; i < body.length; i++) { + const char = body[i]; + if (char === '{') { + depth++; + } else if (char === '}') { + depth = Math.max(depth - 1, 0); + } + + if (char === ' ' && depth === 0) { + if (current) { + tokens.push(current); + current = ''; + } + continue; + } + + current += char; + } + + if (current) { + tokens.push(current); + } + + return tokens; +} + +function normalizeEntryValues(values) { + if (!Array.isArray(values)) { + return []; + } + return getSortedUniqueNumbers(values); +} + +function parseExpectedErrorsEntries(rawEntries) { + const normalized = rawEntries + .replace(/([{,]\s*)([a-zA-Z_$][\w$]*)\s*:/g, '$1"$2":') + .replace(/'([^']*)'/g, '"$1"'); + + const parsed = JSON.parse(normalized); + const entries = {}; + + if (parsed && typeof parsed === 'object') { + for (const [key, value] of Object.entries(parsed)) { + entries[key] = normalizeEntryValues(Array.isArray(value) ? value.flat() : value); + } + } + + return entries; +} + +function parseExpectedErrorsToken(tokenText) { + const match = tokenText.match(/^\{\s*expectedErrors\s*:\s*(\{[\s\S]*\})\s*\}$/); + if (!match) { + return null; + } + + const entriesSource = match[1]; + let parseError = false; + let entries; + + try { + entries = parseExpectedErrorsEntries(entriesSource); + } catch (error) { + parseError = true; + entries = {}; + } + + return { + token: { + type: 'expectedErrors', + entries, + raw: tokenText, + }, + parseError, + }; +} + +function parseFenceMetadata(metaText) { + if (!metaText) { + return { + leading: '', + trailing: '', + tokens: [], + parseError: false, + hadDuplicateExpectedErrors: false, + }; + } + + const leading = metaText.match(/^\s*/)?.[0] ?? ''; + const trailing = metaText.match(/\s*$/)?.[0] ?? ''; + const bodyStart = leading.length; + const bodyEnd = metaText.length - trailing.length; + const body = metaText.slice(bodyStart, bodyEnd).trim(); + + if (!body) { + return { + leading, + trailing, + tokens: [], + parseError: false, + hadDuplicateExpectedErrors: false, + }; + } + + const tokens = []; + let parseError = false; + let sawExpectedErrors = false; + let hadDuplicateExpectedErrors = false; + + for (const rawToken of tokenizeMeta(body)) { + const normalizedToken = rawToken.trim(); + if (!normalizedToken) { + continue; + } + + if (EXPECTED_ERRORS_BLOCK_REGEX.test(normalizedToken)) { + const parsed = parseExpectedErrorsToken(normalizedToken); + if (parsed) { + if (sawExpectedErrors) { + hadDuplicateExpectedErrors = true; + // Drop duplicates. We'll rebuild the canonical block on write. + continue; + } + tokens.push(parsed.token); + parseError = parseError || parsed.parseError; + sawExpectedErrors = true; + continue; + } + } + + tokens.push({type: 'text', raw: normalizedToken}); + } + + return { + leading, + trailing, + tokens, + parseError, + hadDuplicateExpectedErrors, + }; +} + +function cloneMetadata(metadata) { + return { + leading: metadata.leading, + trailing: metadata.trailing, + parseError: metadata.parseError, + hadDuplicateExpectedErrors: metadata.hadDuplicateExpectedErrors, + tokens: metadata.tokens.map((token) => { + if (token.type === 'expectedErrors') { + const clonedEntries = {}; + for (const [key, value] of Object.entries(token.entries)) { + clonedEntries[key] = [...value]; + } + return {type: 'expectedErrors', entries: clonedEntries}; + } + return {type: 'text', raw: token.raw}; + }), + }; +} + +function findExpectedErrorsToken(metadata) { + return metadata.tokens.find((token) => token.type === 'expectedErrors') || null; +} + +function getCompilerExpectedLines(metadata) { + const token = findExpectedErrorsToken(metadata); + if (!token) { + return []; + } + return getSortedUniqueNumbers(token.entries[REACT_COMPILER_KEY] || []); +} + +function hasCompilerEntry(metadata) { + const token = findExpectedErrorsToken(metadata); + return Boolean(token && token.entries[REACT_COMPILER_KEY]?.length); +} + +function metadataHasExpectedErrorsToken(metadata) { + return Boolean(findExpectedErrorsToken(metadata)); +} + +function stringifyExpectedErrorsToken(token) { + const entries = token.entries || {}; + const keys = Object.keys(entries).filter((key) => entries[key].length > 0); + if (keys.length === 0) { + return ''; + } + + keys.sort(); + + const segments = keys.map((key) => { + const values = entries[key]; + return `'${key}': [${values.join(', ')}]`; + }); + + return `{expectedErrors: {${segments.join(', ')}}}`; +} + +function stringifyFenceMetadata(metadata) { + if (!metadata.tokens.length) { + return ''; + } + + const parts = metadata.tokens + .map((token) => { + if (token.type === 'expectedErrors') { + return stringifyExpectedErrorsToken(token); + } + return token.raw; + }) + .filter(Boolean); + + if (!parts.length) { + return ''; + } + + const leading = metadata.leading || ' '; + const trailing = metadata.trailing ? metadata.trailing.trimEnd() : ''; + const body = parts.join(' '); + return `${leading}${body}${trailing}`; +} + +function buildFenceLine(lang, metadata) { + const meta = stringifyFenceMetadata(metadata); + return meta ? `\`\`\`${lang}${meta}` : `\`\`\`${lang}`; +} + +function metadataEquals(a, b) { + if (a.leading !== b.leading || a.trailing !== b.trailing) { + return false; + } + + if (a.tokens.length !== b.tokens.length) { + return false; + } + + for (let i = 0; i < a.tokens.length; i++) { + const left = a.tokens[i]; + const right = b.tokens[i]; + if (left.type !== right.type) { + return false; + } + if (left.type === 'text') { + if (left.raw !== right.raw) { + return false; + } + } else { + const leftKeys = Object.keys(left.entries).sort(); + const rightKeys = Object.keys(right.entries).sort(); + if (leftKeys.length !== rightKeys.length) { + return false; + } + for (let j = 0; j < leftKeys.length; j++) { + if (leftKeys[j] !== rightKeys[j]) { + return false; + } + const lValues = getSortedUniqueNumbers(left.entries[leftKeys[j]]); + const rValues = getSortedUniqueNumbers(right.entries[rightKeys[j]]); + if (lValues.length !== rValues.length) { + return false; + } + for (let k = 0; k < lValues.length; k++) { + if (lValues[k] !== rValues[k]) { + return false; + } + } + } + } + } + + return true; +} + +function normalizeMetadata(metadata) { + const normalized = cloneMetadata(metadata); + normalized.hadDuplicateExpectedErrors = false; + normalized.parseError = false; + if (!normalized.tokens.length) { + normalized.leading = ''; + normalized.trailing = ''; + } + return normalized; +} + +function setCompilerExpectedLines(metadata, lines) { + const normalizedLines = getSortedUniqueNumbers(lines); + if (normalizedLines.length === 0) { + return removeCompilerExpectedLines(metadata); + } + + const next = cloneMetadata(metadata); + let token = findExpectedErrorsToken(next); + if (!token) { + token = {type: 'expectedErrors', entries: {}}; + next.tokens = [token, ...next.tokens]; + } + + token.entries[REACT_COMPILER_KEY] = normalizedLines; + return normalizeMetadata(next); +} + +function removeCompilerExpectedLines(metadata) { + const next = cloneMetadata(metadata); + const token = findExpectedErrorsToken(next); + if (!token) { + return normalizeMetadata(next); + } + + delete token.entries[REACT_COMPILER_KEY]; + + const hasEntries = Object.values(token.entries).some( + (value) => Array.isArray(value) && value.length > 0 + ); + + if (!hasEntries) { + next.tokens = next.tokens.filter((item) => item !== token); + } + + return normalizeMetadata(next); +} + +module.exports = { + buildFenceLine, + getCompilerExpectedLines, + getSortedUniqueNumbers, + hasCompilerEntry, + metadataEquals, + metadataHasExpectedErrorsToken, + parseFenceMetadata, + removeCompilerExpectedLines, + setCompilerExpectedLines, + stringifyFenceMetadata, +}; diff --git a/eslint-local-rules/rules/react-compiler.js b/eslint-local-rules/rules/react-compiler.js new file mode 100644 index 000000000..26d3878ee --- /dev/null +++ b/eslint-local-rules/rules/react-compiler.js @@ -0,0 +1,122 @@ +/** + * Copyright (c) Meta Platforms, Inc. and affiliates. + * + * This source code is licensed under the MIT license found in the + * LICENSE file in the root directory of this source tree. + */ + +const {transformFromAstSync} = require('@babel/core'); +const {parse: babelParse} = require('@babel/parser'); +const BabelPluginReactCompiler = require('babel-plugin-react-compiler').default; +const { + parsePluginOptions, + validateEnvironmentConfig, +} = require('babel-plugin-react-compiler'); + +const COMPILER_OPTIONS = { + noEmit: true, + panicThreshold: 'none', + environment: validateEnvironmentConfig({ + validateRefAccessDuringRender: true, + validateNoSetStateInRender: true, + validateNoSetStateInEffects: true, + validateNoJSXInTryStatements: true, + validateNoImpureFunctionsInRender: true, + validateStaticComponents: true, + validateNoFreezingKnownMutableFunctions: true, + validateNoVoidUseMemo: true, + validateNoCapitalizedCalls: [], + validateHooksUsage: true, + validateNoDerivedComputationsInEffects: true, + }), +}; + +function hasRelevantCode(code) { + const functionPattern = /^(export\s+)?(default\s+)?function\s+\w+/m; + const arrowPattern = + /^(export\s+)?(const|let|var)\s+\w+\s*=\s*(\([^)]*\)|\w+)\s*=>/m; + const hasImports = /^import\s+/m.test(code); + + return functionPattern.test(code) || arrowPattern.test(code) || hasImports; +} + +function runReactCompiler(code, filename) { + const result = { + sourceCode: code, + events: [], + }; + + if (!hasRelevantCode(code)) { + return {...result, diagnostics: []}; + } + + const options = parsePluginOptions({ + ...COMPILER_OPTIONS, + }); + + options.logger = { + logEvent: (_, event) => { + if (event.kind === 'CompileError') { + const category = event.detail?.category; + if (category === 'Todo' || category === 'Invariant') { + return; + } + result.events.push(event); + } + }, + }; + + try { + const ast = babelParse(code, { + sourceFilename: filename, + sourceType: 'module', + plugins: ['jsx', 'typescript'], + }); + + transformFromAstSync(ast, code, { + filename, + highlightCode: false, + retainLines: true, + plugins: [[BabelPluginReactCompiler, options]], + sourceType: 'module', + configFile: false, + babelrc: false, + }); + } catch (error) { + return {...result, diagnostics: []}; + } + + const diagnostics = []; + + for (const event of result.events) { + if (event.kind !== 'CompileError') { + continue; + } + + const detail = event.detail; + if (!detail) { + continue; + } + + const loc = typeof detail.primaryLocation === 'function' + ? detail.primaryLocation() + : null; + + if (loc == null || typeof loc === 'symbol') { + continue; + } + + const message = typeof detail.printErrorMessage === 'function' + ? detail.printErrorMessage(result.sourceCode, {eslint: true}) + : detail.description || 'Unknown React Compiler error'; + + diagnostics.push({detail, loc, message}); + } + + return {...result, diagnostics}; +} + +module.exports = { + hasRelevantCode, + runReactCompiler, +}; diff --git a/eslint-local-rules/yarn.lock b/eslint-local-rules/yarn.lock new file mode 100644 index 000000000..5a7cf126d --- /dev/null +++ b/eslint-local-rules/yarn.lock @@ -0,0 +1,1421 @@ +# THIS IS AN AUTOGENERATED FILE. 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+ "lint:fix": "next lint --fix && eslint \"src/content/**/*.md\" --fix", "format:source": "prettier --config .prettierrc --write \"{plugins,src}/**/*.{js,ts,jsx,tsx,css}\"", "nit:source": "prettier --config .prettierrc --list-different \"{plugins,src}/**/*.{js,ts,jsx,tsx,css}\"", "prettier": "yarn format:source", @@ -22,7 +22,8 @@ "check-all": "npm-run-all prettier lint:fix tsc rss", "rss": "node scripts/generateRss.js", "deadlinks": "node scripts/deadLinkChecker.js", - "copyright": "node scripts/copyright.js" + "copyright": "node scripts/copyright.js", + "test:eslint-local-rules": "yarn --cwd eslint-local-rules test" }, "dependencies": { "@codesandbox/sandpack-react": "2.13.5", @@ -70,6 +71,7 @@ "eslint-plugin-flowtype": "4.x", "eslint-plugin-import": "2.x", "eslint-plugin-jsx-a11y": "6.x", + "eslint-plugin-local-rules": "link:eslint-local-rules", "eslint-plugin-react": "7.x", "eslint-plugin-react-compiler": "^19.0.0-beta-e552027-20250112", "eslint-plugin-react-hooks": "^0.0.0-experimental-fabef7a6b-20221215", diff --git a/yarn.lock b/yarn.lock index cc7843bb8..b8480f1c5 100644 --- a/yarn.lock +++ b/yarn.lock @@ -3405,6 +3405,10 @@ eslint-plugin-jsx-a11y@^6.4.1: safe-regex-test "^1.0.3" string.prototype.includes "^2.0.0" +"eslint-plugin-local-rules@link:eslint-local-rules": + version "0.0.0" + uid "" + eslint-plugin-react-compiler@^19.0.0-beta-e552027-20250112: version "19.0.0-beta-e552027-20250112" resolved "https://registry.yarnpkg.com/eslint-plugin-react-compiler/-/eslint-plugin-react-compiler-19.0.0-beta-e552027-20250112.tgz#f4ad9cebe47615ebf6097a8084a30d761ee164f4" From 5cc9b7ba31630dd3a2e8178b007e876f83489a54 Mon Sep 17 00:00:00 2001 From: lauren Date: Thu, 18 Sep 2025 15:32:27 -0400 Subject: [PATCH 05/15] fix compiler errors (#7989) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * Add local eslint rule to validate markdown codeblocks with React Compiler In https://github.com/facebook/react/pull/34462 for example, we found an issue where the compiler was incorrectly validating an example straight from the docs. In order to find more issues like this + also provide more feedback to doc authors on valid/invalid patterns, this PR adds a new local eslint rule which validates all markdown codeblocks containing components/hooks with React Compiler. An autofixer is also provided. To express that a codeblock has an expected error, we can use the following metadata: ```ts // pseudo type def type MarkdownCodeBlockMetadata = { expectedErrors?: { 'react-compiler'?: number[]; }; }; ``` and can be used like so: ```` ```js {expectedErrors: {'react-compiler': [4]}} // ❌ setState directly in render function Component({value}) { const [count, setCount] = useState(0); setCount(value); // error on L4 return
{count}
; } ``` ```` Because this is defined as a local rule, we don't have the same granular reporting that `eslint-plugin-react-hooks` yet. I can look into that later but for now this first PR just sets us up with something basic. * fix compiler errors I went through the list of existing errors and tried to separate the expected errors from those that seem to be flagging unexpected issues. In particular, our effects validations are flagging patterns that our own docs examples use. I added todos for these and will follow up later. --- src/content/learn/describing-the-ui.md | 2 +- src/content/learn/escape-hatches.md | 2 +- src/content/learn/keeping-components-pure.md | 10 +++---- .../learn/lifecycle-of-reactive-effects.md | 4 +-- .../learn/preserving-and-resetting-state.md | 2 +- .../learn/react-compiler/introduction.md | 2 +- .../learn/referencing-values-with-refs.md | 6 ++-- .../learn/removing-effect-dependencies.md | 4 +-- src/content/learn/responding-to-events.md | 2 +- .../learn/separating-events-from-effects.md | 6 ++-- .../learn/state-a-components-memory.md | 6 ++-- .../learn/synchronizing-with-effects.md | 13 +++++---- .../learn/updating-objects-in-state.md | 10 +++---- .../learn/you-might-not-need-an-effect.md | 16 +++++----- .../reference/react-dom/client/hydrateRoot.md | 3 +- .../reference/react-dom/createPortal.md | 3 +- src/content/reference/react/cache.md | 29 +++++++++---------- src/content/reference/react/useCallback.md | 12 ++++---- .../reference/react/useDeferredValue.md | 6 ++-- src/content/reference/react/useEffect.md | 7 +++-- .../reference/react/useLayoutEffect.md | 16 ++++++---- src/content/reference/react/useMemo.md | 13 +++++---- src/content/reference/react/useRef.md | 2 +- src/content/reference/react/useTransition.md | 18 ++++++------ .../components-and-hooks-must-be-pure.md | 8 ++--- .../rules/react-calls-components-and-hooks.md | 6 ++-- 26 files changed, 109 insertions(+), 99 deletions(-) diff --git a/src/content/learn/describing-the-ui.md b/src/content/learn/describing-the-ui.md index 34ee0c01a..339f04223 100644 --- a/src/content/learn/describing-the-ui.md +++ b/src/content/learn/describing-the-ui.md @@ -474,7 +474,7 @@ By strictly only writing your components as pure functions, you can avoid an ent -```js +```js {expectedErrors: {'react-compiler': [5]}} let guest = 0; function Cup() { diff --git a/src/content/learn/escape-hatches.md b/src/content/learn/escape-hatches.md index 23f11f54e..0b2d595b2 100644 --- a/src/content/learn/escape-hatches.md +++ b/src/content/learn/escape-hatches.md @@ -201,7 +201,7 @@ There are two common cases in which you don't need Effects: For example, you don't need an Effect to adjust some state based on other state: -```js {5-9} +```js {expectedErrors: {'react-compiler': [8]}} {5-9} function Form() { const [firstName, setFirstName] = useState('Taylor'); const [lastName, setLastName] = useState('Swift'); diff --git a/src/content/learn/keeping-components-pure.md b/src/content/learn/keeping-components-pure.md index 70049e58e..fafd488e3 100644 --- a/src/content/learn/keeping-components-pure.md +++ b/src/content/learn/keeping-components-pure.md @@ -93,7 +93,7 @@ Here is a component that breaks this rule: -```js +```js {expectedErrors: {'react-compiler': [5]}} let guest = 0; function Cup() { @@ -380,7 +380,7 @@ The buggy code is in `Profile.js`. Make sure you read it all from top to bottom! -```js src/Profile.js +```js {expectedErrors: {'react-compiler': [7]}} src/Profile.js import Panel from './Panel.js'; import { getImageUrl } from './utils.js'; @@ -602,7 +602,7 @@ export default function StoryTray({ stories }) { } ``` -```js src/App.js hidden +```js {expectedErrors: {'react-compiler': [16]}} src/App.js hidden import { useState, useEffect } from 'react'; import StoryTray from './StoryTray.js'; @@ -698,7 +698,7 @@ export default function StoryTray({ stories }) { } ``` -```js src/App.js hidden +```js {expectedErrors: {'react-compiler': [16]}} src/App.js hidden import { useState, useEffect } from 'react'; import StoryTray from './StoryTray.js'; @@ -790,7 +790,7 @@ export default function StoryTray({ stories }) { } ``` -```js src/App.js hidden +```js {expectedErrors: {'react-compiler': [16]}} src/App.js hidden import { useState, useEffect } from 'react'; import StoryTray from './StoryTray.js'; diff --git a/src/content/learn/lifecycle-of-reactive-effects.md b/src/content/learn/lifecycle-of-reactive-effects.md index 3dc9a75f0..72a2e7755 100644 --- a/src/content/learn/lifecycle-of-reactive-effects.md +++ b/src/content/learn/lifecycle-of-reactive-effects.md @@ -1131,7 +1131,7 @@ If you see a linter rule being suppressed, remove the suppression! That's where -```js +```js {expectedErrors: {'react-compiler': [16]}} import { useState, useEffect } from 'react'; export default function App() { @@ -1374,7 +1374,7 @@ export default function App() { } ``` -```js src/ChatRoom.js active +```js {expectedErrors: {'react-compiler': [8]}} src/ChatRoom.js active import { useState, useEffect } from 'react'; export default function ChatRoom({ roomId, createConnection }) { diff --git a/src/content/learn/preserving-and-resetting-state.md b/src/content/learn/preserving-and-resetting-state.md index 11d398d23..041fae355 100644 --- a/src/content/learn/preserving-and-resetting-state.md +++ b/src/content/learn/preserving-and-resetting-state.md @@ -704,7 +704,7 @@ Here, the `MyTextField` component function is defined *inside* `MyComponent`: -```js +```js {expectedErrors: {'react-compiler': [7]}} import { useState } from 'react'; export default function MyComponent() { diff --git a/src/content/learn/react-compiler/introduction.md b/src/content/learn/react-compiler/introduction.md index 9957b8227..96fa8802a 100644 --- a/src/content/learn/react-compiler/introduction.md +++ b/src/content/learn/react-compiler/introduction.md @@ -28,7 +28,7 @@ React Compiler automatically optimizes your React application at build time. Rea Without the compiler, you need to manually memoize components and values to optimize re-renders: -```js +```js {expectedErrors: {'react-compiler': [4]}} import { useMemo, useCallback, memo } from 'react'; const ExpensiveComponent = memo(function ExpensiveComponent({ data, onClick }) { diff --git a/src/content/learn/referencing-values-with-refs.md b/src/content/learn/referencing-values-with-refs.md index fab6599f2..4386e2bdc 100644 --- a/src/content/learn/referencing-values-with-refs.md +++ b/src/content/learn/referencing-values-with-refs.md @@ -211,7 +211,7 @@ If you tried to implement this with a ref, React would never re-render the compo -```js +```js {expectedErrors: {'react-compiler': [13]}} import { useRef } from 'react'; export default function Counter() { @@ -313,7 +313,7 @@ Regular variables like `let timeoutID` don't "survive" between re-renders becaus -```js +```js {expectedErrors: {'react-compiler': [10]}} import { useState } from 'react'; export default function Chat() { @@ -418,7 +418,7 @@ This button is supposed to toggle between showing "On" and "Off". However, it al -```js +```js {expectedErrors: {'react-compiler': [10]}} import { useRef } from 'react'; export default function Toggle() { diff --git a/src/content/learn/removing-effect-dependencies.md b/src/content/learn/removing-effect-dependencies.md index 9a848862a..7ab6dbc1f 100644 --- a/src/content/learn/removing-effect-dependencies.md +++ b/src/content/learn/removing-effect-dependencies.md @@ -303,7 +303,7 @@ Suppressing the linter leads to very unintuitive bugs that are hard to find and -```js +```js {expectedErrors: {'react-compiler': [14]}} import { useState, useEffect } from 'react'; export default function Timer() { @@ -794,7 +794,7 @@ It is important to declare it as a dependency! This ensures, for example, that i -```js +```js {expectedErrors: {'react-compiler': [10]}} import { useState, useEffect } from 'react'; import { createConnection } from './chat.js'; diff --git a/src/content/learn/responding-to-events.md b/src/content/learn/responding-to-events.md index 17bd087ed..78474217c 100644 --- a/src/content/learn/responding-to-events.md +++ b/src/content/learn/responding-to-events.md @@ -546,7 +546,7 @@ Clicking this button is supposed to switch the page background between white and -```js +```js {expectedErrors: {'react-compiler': [5, 7]}} export default function LightSwitch() { function handleClick() { let bodyStyle = document.body.style; diff --git a/src/content/learn/separating-events-from-effects.md b/src/content/learn/separating-events-from-effects.md index 03223183b..fd603c395 100644 --- a/src/content/learn/separating-events-from-effects.md +++ b/src/content/learn/separating-events-from-effects.md @@ -711,7 +711,7 @@ Here, `url` inside `onVisit` corresponds to the *latest* `url` (which could have In the existing codebases, you may sometimes see the lint rule suppressed like this: -```js {7-9} +```js {expectedErrors: {'react-compiler': [8]}} {7-9} function Page({ url }) { const { items } = useContext(ShoppingCartContext); const numberOfItems = items.length; @@ -735,7 +735,7 @@ Can you see why? -```js +```js {expectedErrors: {'react-compiler': [16]}} import { useState, useEffect } from 'react'; export default function App() { @@ -990,7 +990,7 @@ To fix this code, it's enough to follow the rules. ``` -```js +```js {expectedErrors: {'react-compiler': [14]}} import { useState, useEffect } from 'react'; export default function Timer() { diff --git a/src/content/learn/state-a-components-memory.md b/src/content/learn/state-a-components-memory.md index 73d46bdab..0efe1191d 100644 --- a/src/content/learn/state-a-components-memory.md +++ b/src/content/learn/state-a-components-memory.md @@ -23,7 +23,7 @@ Here's a component that renders a sculpture image. Clicking the "Next" button sh -```js +```js {expectedErrors: {'react-compiler': [7]}} import { sculptureList } from './data.js'; export default function Gallery() { @@ -1229,7 +1229,7 @@ When you type into the input fields, nothing appears. It's like the input values -```js +```js {expectedErrors: {'react-compiler': [6]}} export default function Form() { let firstName = ''; let lastName = ''; @@ -1337,7 +1337,7 @@ Are there any limitations on _where_ Hooks may be called? Does this component br -```js +```js {expectedErrors: {'react-compiler': [9]}} import { useState } from 'react'; export default function FeedbackForm() { diff --git a/src/content/learn/synchronizing-with-effects.md b/src/content/learn/synchronizing-with-effects.md index c0ad34709..7f61a255b 100644 --- a/src/content/learn/synchronizing-with-effects.md +++ b/src/content/learn/synchronizing-with-effects.md @@ -95,7 +95,7 @@ You might be tempted to try to call `play()` or `pause()` during rendering, but -```js +```js {expectedErrors: {'react-compiler': [7, 9]}} import { useState, useRef, useEffect } from 'react'; function VideoPlayer({ src, isPlaying }) { @@ -617,7 +617,7 @@ A common pitfall for preventing Effects firing twice in development is to use a This makes it so you only see `"✅ Connecting..."` once in development, but it doesn't fix the bug. -When the user navigates away, the connection still isn't closed and when they navigate back, a new connection is created. As the user navigates across the app, the connections would keep piling up, the same as it would before the "fix". +When the user navigates away, the connection still isn't closed and when they navigate back, a new connection is created. As the user navigates across the app, the connections would keep piling up, the same as it would before the "fix". To fix the bug, it is not enough to just make the Effect run once. The effect needs to work after re-mounting, which means the connection needs to be cleaned up like in the solution above. @@ -1005,7 +1005,7 @@ export default function MyInput({ value, onChange }) { const ref = useRef(null); // TODO: This doesn't quite work. Fix it. - // ref.current.focus() + // ref.current.focus() return ( -```js src/App.js +{/* not the most efficient, but this validation is enabled in the linter only, so it's fine to ignore it here since we know what we're doing */} +```js {expectedErrors: {'react-compiler': [9]}} src/App.js import { useState, useEffect } from 'react'; import { fetchBio } from './api.js'; @@ -1541,7 +1542,8 @@ To fix this race condition, add a cleanup function: -```js src/App.js +{/* not the most efficient, but this validation is enabled in the linter only, so it's fine to ignore it here since we know what we're doing */} +```js {expectedErrors: {'react-compiler': [9]}} src/App.js import { useState, useEffect } from 'react'; import { fetchBio } from './api.js'; @@ -1605,4 +1607,3 @@ In addition to ignoring the result of an outdated API call, you can also use [`A - diff --git a/src/content/learn/updating-objects-in-state.md b/src/content/learn/updating-objects-in-state.md index 93ea93bd2..ca6585145 100644 --- a/src/content/learn/updating-objects-in-state.md +++ b/src/content/learn/updating-objects-in-state.md @@ -55,7 +55,7 @@ This example holds an object in state to represent the current pointer position. -```js +```js {expectedErrors: {'react-compiler': [11]}} import { useState } from 'react'; export default function MovingDot() { @@ -209,7 +209,7 @@ These input fields don't work because the `onChange` handlers mutate the state: -```js +```js {expectedErrors: {'react-compiler': [11, 15, 19]}} import { useState } from 'react'; export default function Form() { @@ -832,7 +832,7 @@ Your task is to fix all of these bugs. As you fix them, explain why each of them -```js +```js {expectedErrors: {'react-compiler': [11]}} import { useState } from 'react'; export default function Scoreboard() { @@ -988,7 +988,7 @@ If something unexpected changes, there is a mutation. Find the mutation in `App. -```js src/App.js +```js {expectedErrors: {'react-compiler': [17]}} src/App.js import { useState } from 'react'; import Background from './Background.js'; import Box from './Box.js'; @@ -1293,7 +1293,7 @@ This is the same buggy example as in the previous challenge. This time, fix the -```js src/App.js +```js {expectedErrors: {'react-compiler': [18]}} src/App.js import { useState } from 'react'; import { useImmer } from 'use-immer'; import Background from './Background.js'; 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 88e490e1a..39a1dc740 100644 --- a/src/content/learn/you-might-not-need-an-effect.md +++ b/src/content/learn/you-might-not-need-an-effect.md @@ -34,7 +34,7 @@ To help you gain the right intuition, let's look at some common concrete example Suppose you have a component with two state variables: `firstName` and `lastName`. You want to calculate a `fullName` from them by concatenating them. Moreover, you'd like `fullName` to update whenever `firstName` or `lastName` change. Your first instinct might be to add a `fullName` state variable and update it in an Effect: -```js {5-9} +```js {expectedErrors: {'react-compiler': [8]}} {5-9} function Form() { const [firstName, setFirstName] = useState('Taylor'); const [lastName, setLastName] = useState('Swift'); @@ -66,7 +66,7 @@ function Form() { This component computes `visibleTodos` by taking the `todos` it receives by props and filtering them according to the `filter` prop. You might feel tempted to store the result in state and update it from an Effect: -```js {4-8} +```js {expectedErrors: {'react-compiler': [7]}} {4-8} function TodoList({ todos, filter }) { const [newTodo, setNewTodo] = useState(''); @@ -165,7 +165,7 @@ Also note that measuring performance in development will not give you the most a This `ProfilePage` component receives a `userId` prop. The page contains a comment input, and you use a `comment` state variable to hold its value. One day, you notice a problem: when you navigate from one profile to another, the `comment` state does not get reset. As a result, it's easy to accidentally post a comment on a wrong user's profile. To fix the issue, you want to clear out the `comment` state variable whenever the `userId` changes: -```js {4-7} +```js {expectedErrors: {'react-compiler': [6]}} {4-7} export default function ProfilePage({ userId }) { const [comment, setComment] = useState(''); @@ -208,7 +208,7 @@ Sometimes, you might want to reset or adjust a part of the state on a prop chang This `List` component receives a list of `items` as a prop, and maintains the selected item in the `selection` state variable. You want to reset the `selection` to `null` whenever the `items` prop receives a different array: -```js {5-8} +```js {expectedErrors: {'react-compiler': [7]}} {5-8} function List({ items }) { const [isReverse, setIsReverse] = useState(false); const [selection, setSelection] = useState(null); @@ -819,7 +819,7 @@ Simplify this component by removing all the unnecessary state and Effects. -```js +```js {expectedErrors: {'react-compiler': [12, 16, 20]}} import { useState, useEffect } from 'react'; import { initialTodos, createTodo } from './todos.js'; @@ -1022,7 +1022,7 @@ One solution is to add a `useMemo` call to cache the visible todos. There is als -```js +```js {expectedErrors: {'react-compiler': [11]}} import { useState, useEffect } from 'react'; import { initialTodos, createTodo, getVisibleTodos } from './todos.js'; @@ -1106,7 +1106,7 @@ Remove the state variable and the Effect, and instead add a `useMemo` call to ca -```js +```js {expectedErrors: {'react-compiler': [8]}} import { useState, useMemo } from 'react'; import { initialTodos, createTodo, getVisibleTodos } from './todos.js'; @@ -1363,7 +1363,7 @@ export default function ContactList({ } ``` -```js src/EditContact.js active +```js {expectedErrors: {'react-compiler': [8, 9]}} src/EditContact.js active import { useState, useEffect } from 'react'; export default function EditContact({ savedContact, onSave }) { diff --git a/src/content/reference/react-dom/client/hydrateRoot.md b/src/content/reference/react-dom/client/hydrateRoot.md index b74e2c38e..c48b6eb51 100644 --- a/src/content/reference/react-dom/client/hydrateRoot.md +++ b/src/content/reference/react-dom/client/hydrateRoot.md @@ -296,7 +296,8 @@ import App from './App.js'; hydrateRoot(document.getElementById('root'), ); ``` -```js src/App.js active +{/* kind of an edge case, seems fine to use this hack here */} +```js {expectedErrors: {'react-compiler': [7]}} src/App.js active import { useState, useEffect } from "react"; export default function App() { diff --git a/src/content/reference/react-dom/createPortal.md b/src/content/reference/react-dom/createPortal.md index e806660e8..4521dfa47 100644 --- a/src/content/reference/react-dom/createPortal.md +++ b/src/content/reference/react-dom/createPortal.md @@ -398,7 +398,8 @@ Here is a complete example you can play with: } ``` -```js src/App.js +{/* TODO(@poteto) - fixed by https://github.com/facebook/react/pull/34462. need a new release */} +```js {expectedErrors: {'react-compiler': [15]}} src/App.js import { useRef, useEffect, useState } from 'react'; import { createPortal } from 'react-dom'; import { createMapWidget, addPopupToMapWidget } from './map-widget.js'; diff --git a/src/content/reference/react/cache.md b/src/content/reference/react/cache.md index 442584808..c82543479 100644 --- a/src/content/reference/react/cache.md +++ b/src/content/reference/react/cache.md @@ -65,7 +65,7 @@ The optimization of caching return values based on inputs is known as [_memoizat [//]: # 'TODO: add links to Server/Client Component reference once https://github.com/reactjs/react.dev/pull/6177 is merged' -- React will invalidate the cache for all memoized functions for each server request. +- React will invalidate the cache for all memoized functions for each server request. - Each call to `cache` creates a new function. This means that calling `cache` with the same function multiple times will return different memoized functions that do not share the same cache. - `cachedFn` will also cache errors. If `fn` throws an error for certain arguments, it will be cached, and the same error is re-thrown when `cachedFn` is called with those same arguments. - `cache` is for use in [Server Components](/blog/2023/03/22/react-labs-what-we-have-been-working-on-march-2023#react-server-components) only. @@ -98,9 +98,9 @@ function TeamReport({users}) { } ``` -If the same `user` object is rendered in both `Profile` and `TeamReport`, the two components can share work and only call `calculateUserMetrics` once for that `user`. +If the same `user` object is rendered in both `Profile` and `TeamReport`, the two components can share work and only call `calculateUserMetrics` once for that `user`. -Assume `Profile` is rendered first. It will call `getUserMetrics`, and check if there is a cached result. Since it is the first time `getUserMetrics` is called with that `user`, there will be a cache miss. `getUserMetrics` will then call `calculateUserMetrics` with that `user` and write the result to cache. +Assume `Profile` is rendered first. It will call `getUserMetrics`, and check if there is a cached result. Since it is the first time `getUserMetrics` is called with that `user`, there will be a cache miss. `getUserMetrics` will then call `calculateUserMetrics` with that `user` and write the result to cache. When `TeamReport` renders its list of `users` and reaches the same `user` object, it will call `getUserMetrics` and read the result from cache. @@ -170,12 +170,12 @@ export default function Precipitation({cityData}) { // ... } ``` -Here, both components call the same memoized function exported from `./getWeekReport.js` to read and write to the same cache. +Here, both components call the same memoized function exported from `./getWeekReport.js` to read and write to the same cache. ### Share a snapshot of data {/*take-and-share-snapshot-of-data*/} -To share a snapshot of data between components, call `cache` with a data-fetching function like `fetch`. When multiple components make the same data fetch, only one request is made and the data returned is cached and shared across components. All components refer to the same snapshot of data across the server render. +To share a snapshot of data between components, call `cache` with a data-fetching function like `fetch`. When multiple components make the same data fetch, only one request is made and the data returned is cached and shared across components. All components refer to the same snapshot of data across the server render. ```js [[1, 4, "city"], [1, 5, "fetchTemperature(city)"], [2, 4, "getTemperature"], [2, 9, "getTemperature"], [1, 9, "city"], [2, 14, "getTemperature"], [1, 14, "city"]] import {cache} from 'react'; @@ -196,7 +196,7 @@ async function MinimalWeatherCard({city}) { } ``` -If `AnimatedWeatherCard` and `MinimalWeatherCard` both render for the same city, they will receive the same snapshot of data from the memoized function. +If `AnimatedWeatherCard` and `MinimalWeatherCard` both render for the same city, they will receive the same snapshot of data from the memoized function. If `AnimatedWeatherCard` and `MinimalWeatherCard` supply different city arguments to `getTemperature`, then `fetchTemperature` will be called twice and each call site will receive different data. @@ -260,7 +260,7 @@ When rendering `Profile`, we call `getUser` again. When evaluating an [asynchronous function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function), you will receive a [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) for that work. The promise holds the state of that work (_pending_, _fulfilled_, _failed_) and its eventual settled result. -In this example, the asynchronous function `fetchData` returns a promise that is awaiting the `fetch`. +In this example, the asynchronous function `fetchData` returns a promise that is awaiting the `fetch`. ```js [[1, 1, "fetchData()"], [2, 8, "getData()"], [3, 10, "getData()"]] async function fetchData() { @@ -271,7 +271,7 @@ const getData = cache(fetchData); async function MyComponent() { getData(); - // ... some computational work + // ... some computational work await getData(); // ... } @@ -281,7 +281,7 @@ In calling `getData` the first time, the promise r Notice that the first `getData` call does not `await` whereas the second does. [`await`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await) is a JavaScript operator that will wait and return the settled result of the promise. The first `getData` call simply initiates the `fetch` to cache the promise for the second `getData` to look-up. -If by the second call the promise is still _pending_, then `await` will pause for the result. The optimization is that while we wait on the `fetch`, React can continue with computational work, thus reducing the wait time for the second call. +If by the second call the promise is still _pending_, then `await` will pause for the result. The optimization is that while we wait on the `fetch`, React can continue with computational work, thus reducing the wait time for the second call. If the promise is already settled, either to an error or the _fulfilled_ result, `await` will return that value immediately. In both outcomes, there is a performance benefit. @@ -309,7 +309,7 @@ async function DemoProfile() { React only provides cache access to the memoized function in a component. When calling `getUser` outside of a component, it will still evaluate the function but not read or update the cache. -This is because cache access is provided through a [context](/learn/passing-data-deeply-with-context) which is only accessible from a component. +This is because cache access is provided through a [context](/learn/passing-data-deeply-with-context) which is only accessible from a component. @@ -323,7 +323,7 @@ All mentioned APIs offer memoization but the difference is what they're intended In general, you should use [`useMemo`](/reference/react/useMemo) for caching an expensive computation in a Client Component across renders. As an example, to memoize a transformation of data within a component. -```jsx {4} +```jsx {expectedErrors: {'react-compiler': [4]}} {4} 'use client'; function WeatherReport({record}) { @@ -343,7 +343,7 @@ function App() { ``` In this example, `App` renders two `WeatherReport`s with the same record. Even though both components do the same work, they cannot share work. `useMemo`'s cache is only local to the component. -However, `useMemo` does ensure that if `App` re-renders and the `record` object doesn't change, each component instance would skip work and use the memoized value of `avgTemp`. `useMemo` will only cache the last computation of `avgTemp` with the given dependencies. +However, `useMemo` does ensure that if `App` re-renders and the `record` object doesn't change, each component instance would skip work and use the memoized value of `avgTemp`. `useMemo` will only cache the last computation of `avgTemp` with the given dependencies. #### `cache` {/*deep-dive-cache*/} @@ -379,7 +379,7 @@ You should use [`memo`](reference/react/memo) to prevent a component re-renderin 'use client'; function WeatherReport({record}) { - const avgTemp = calculateAvg(record); + const avgTemp = calculateAvg(record); // ... } @@ -396,7 +396,7 @@ function App() { } ``` -In this example, both `MemoWeatherReport` components will call `calculateAvg` when first rendered. However, if `App` re-renders, with no changes to `record`, none of the props have changed and `MemoWeatherReport` will not re-render. +In this example, both `MemoWeatherReport` components will call `calculateAvg` when first rendered. However, if `App` re-renders, with no changes to `record`, none of the props have changed and `MemoWeatherReport` will not re-render. Compared to `useMemo`, `memo` memoizes the component render based on props vs. specific computations. Similar to `useMemo`, the memoized component only caches the last render with the last prop values. Once the props change, the cache invalidates and the component re-renders. @@ -495,4 +495,3 @@ function App() { ); } ``` - diff --git a/src/content/reference/react/useCallback.md b/src/content/reference/react/useCallback.md index acae804ec..9a1520f44 100644 --- a/src/content/reference/react/useCallback.md +++ b/src/content/reference/react/useCallback.md @@ -130,7 +130,7 @@ function ProductPage({ productId, referrer, theme }) { orderDetails, }); } - + return (
{/* ... so ShippingForm's props will never be the same, and it will re-render every time */} @@ -207,7 +207,7 @@ The difference is in *what* they're letting you cache: If you're already familiar with [`useMemo`,](/reference/react/useMemo) you might find it helpful to think of `useCallback` as this: -```js +```js {expectedErrors: {'react-compiler': [3]}} // Simplified implementation (inside React) function useCallback(fn, dependencies) { return useMemo(() => fn, dependencies); @@ -222,7 +222,7 @@ function useCallback(fn, dependencies) { #### Should you add useCallback everywhere? {/*should-you-add-usecallback-everywhere*/} -If your app is like this site, and most interactions are coarse (like replacing a page or an entire section), memoization is usually unnecessary. On the other hand, if your app is more like a drawing editor, and most interactions are granular (like moving shapes), then you might find memoization very helpful. +If your app is like this site, and most interactions are coarse (like replacing a page or an entire section), memoization is usually unnecessary. On the other hand, if your app is more like a drawing editor, and most interactions are granular (like moving shapes), then you might find memoization very helpful. Caching a function with `useCallback` is only valuable in a few cases: @@ -310,7 +310,7 @@ function post(url, data) { } ``` -```js src/ShippingForm.js +```js {expectedErrors: {'react-compiler': [7, 8]}} src/ShippingForm.js import { memo, useState } from 'react'; const ShippingForm = memo(function ShippingForm({ onSubmit }) { @@ -449,7 +449,7 @@ function post(url, data) { } ``` -```js src/ShippingForm.js +```js {expectedErrors: {'react-compiler': [7, 8]}} src/ShippingForm.js import { memo, useState } from 'react'; const ShippingForm = memo(function ShippingForm({ onSubmit }) { @@ -868,7 +868,7 @@ When you find which dependency is breaking memoization, either find a way to rem Suppose the `Chart` component is wrapped in [`memo`](/reference/react/memo). You want to skip re-rendering every `Chart` in the list when the `ReportList` component re-renders. However, you can't call `useCallback` in a loop: -```js {5-14} +```js {expectedErrors: {'react-compiler': [6]}} {5-14} function ReportList({ items }) { return (
diff --git a/src/content/reference/react/useDeferredValue.md b/src/content/reference/react/useDeferredValue.md index ed561c977..bf716b173 100644 --- a/src/content/reference/react/useDeferredValue.md +++ b/src/content/reference/react/useDeferredValue.md @@ -244,7 +244,7 @@ input { margin: 10px; } -A common alternative UI pattern is to *defer* updating the list of results and to keep showing the previous results until the new results are ready. Call `useDeferredValue` to pass a deferred version of the query down: +A common alternative UI pattern is to *defer* updating the list of results and to keep showing the previous results until the new results are ready. Call `useDeferredValue` to pass a deferred version of the query down: ```js {3,11} export default function App() { @@ -669,7 +669,7 @@ export default function App() { } ``` -```js src/SlowList.js +```js {expectedErrors: {'react-compiler': [19, 20]}} src/SlowList.js import { memo } from 'react'; const SlowList = memo(function SlowList({ text }) { @@ -746,7 +746,7 @@ export default function App() { } ``` -```js src/SlowList.js +```js {expectedErrors: {'react-compiler': [19, 20]}} src/SlowList.js import { memo } from 'react'; const SlowList = memo(function SlowList({ text }) { diff --git a/src/content/reference/react/useEffect.md b/src/content/reference/react/useEffect.md index e93e61102..a250bb15a 100644 --- a/src/content/reference/react/useEffect.md +++ b/src/content/reference/react/useEffect.md @@ -928,7 +928,8 @@ Note the `ignore` variable which is initialized to `false`, and is set to `true` -```js src/App.js +{/* TODO(@poteto) - investigate potential false positives in react compiler validation */} +```js {expectedErrors: {'react-compiler': [9]}} src/App.js import { useState, useEffect } from 'react'; import { fetchBio } from './api.js'; @@ -1737,7 +1738,9 @@ If your app uses server rendering (either [directly](/reference/react-dom/server In rare cases, you might need to display different content on the client. For example, if your app reads some data from [`localStorage`](https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage), it can't possibly do that on the server. Here is how you could implement this: -```js + +{/* TODO(@poteto) - investigate potential false positives in react compiler validation */} +```js {expectedErrors: {'react-compiler': [5]}} function MyComponent() { const [didMount, setDidMount] = useState(false); diff --git a/src/content/reference/react/useLayoutEffect.md b/src/content/reference/react/useLayoutEffect.md index d38458f14..e562e623a 100644 --- a/src/content/reference/react/useLayoutEffect.md +++ b/src/content/reference/react/useLayoutEffect.md @@ -48,7 +48,7 @@ function Tooltip() { #### Parameters {/*parameters*/} * `setup`: The function with your Effect's logic. Your setup function may also optionally return a *cleanup* function. Before your component is added to the DOM, React will run your setup function. After every re-render with changed dependencies, React will first run the cleanup function (if you provided it) with the old values, and then run your setup function with the new values. Before your component is removed from the DOM, React will run your cleanup function. - + * **optional** `dependencies`: The list of all reactive values referenced inside of the `setup` code. Reactive values include props, state, and all the variables and functions declared directly inside your component body. If your linter is [configured for React](/learn/editor-setup#linting), it will verify that every reactive value is correctly specified as a dependency. The list of dependencies must have a constant number of items and be written inline like `[dep1, dep2, dep3]`. React will compare each dependency with its previous value using the [`Object.is`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is) comparison. If you omit this argument, your Effect will re-run after every re-render of the component. #### Returns {/*returns*/} @@ -87,7 +87,8 @@ To do this, you need to render in two passes: **All of this needs to happen before the browser repaints the screen.** You don't want the user to see the tooltip moving. Call `useLayoutEffect` to perform the layout measurements before the browser repaints the screen: -```js {5-8} +{/* TODO(@poteto) - fixed by https://github.com/facebook/react/pull/34462. need a new release */} +```js {expectedErrors: {'react-compiler': [7]}} {5-8} function Tooltip() { const ref = useRef(null); const [tooltipHeight, setTooltipHeight] = useState(0); // You don't know real height yet @@ -187,7 +188,8 @@ export default function ButtonWithTooltip({ tooltipContent, ...rest }) { } ``` -```js src/Tooltip.js active +{/* TODO(@poteto) - fixed by https://github.com/facebook/react/pull/34462. need a new release */} +```js {expectedErrors: {'react-compiler': [11]}} src/Tooltip.js active import { useRef, useLayoutEffect, useState } from 'react'; import { createPortal } from 'react-dom'; import TooltipContainer from './TooltipContainer.js'; @@ -337,7 +339,8 @@ export default function ButtonWithTooltip({ tooltipContent, ...rest }) { } ``` -```js src/Tooltip.js active +{/* TODO(@poteto) - fixed by https://github.com/facebook/react/pull/34462. need a new release */} +```js {expectedErrors: {'react-compiler': [11]}} src/Tooltip.js active import { useRef, useLayoutEffect, useState } from 'react'; import { createPortal } from 'react-dom'; import TooltipContainer from './TooltipContainer.js'; @@ -484,7 +487,8 @@ export default function ButtonWithTooltip({ tooltipContent, ...rest }) { } ``` -```js src/Tooltip.js active +{/* TODO(@poteto) - fixed by https://github.com/facebook/react/pull/34462. need a new release */} +```js {expectedErrors: {'react-compiler': [11]}} src/Tooltip.js active import { useRef, useEffect, useState } from 'react'; import { createPortal } from 'react-dom'; import TooltipContainer from './TooltipContainer.js'; @@ -627,7 +631,7 @@ export default function ButtonWithTooltip({ tooltipContent, ...rest }) { } ``` -```js src/Tooltip.js active +```js {expectedErrors: {'react-compiler': [10, 11]}} src/Tooltip.js active import { useRef, useEffect, useState } from 'react'; import { createPortal } from 'react-dom'; import TooltipContainer from './TooltipContainer.js'; diff --git a/src/content/reference/react/useMemo.md b/src/content/reference/react/useMemo.md index f0bdd77fb..bbb2ad622 100644 --- a/src/content/reference/react/useMemo.md +++ b/src/content/reference/react/useMemo.md @@ -149,7 +149,7 @@ Also note that measuring performance in development will not give you the most a #### Should you add useMemo everywhere? {/*should-you-add-usememo-everywhere*/} -If your app is like this site, and most interactions are coarse (like replacing a page or an entire section), memoization is usually unnecessary. On the other hand, if your app is more like a drawing editor, and most interactions are granular (like moving shapes), then you might find memoization very helpful. +If your app is like this site, and most interactions are coarse (like replacing a page or an entire section), memoization is usually unnecessary. On the other hand, if your app is more like a drawing editor, and most interactions are granular (like moving shapes), then you might find memoization very helpful. Optimizing with `useMemo` is only valuable in a few cases: @@ -225,7 +225,8 @@ export default function App() { ``` -```js src/TodoList.js active +{/* TODO(@poteto) - investigate potential false positives in react compiler validation */} +```js {expectedErrors: {'react-compiler': [5]}} src/TodoList.js active import { useMemo } from 'react'; import { filterTodos } from './utils.js' @@ -717,7 +718,7 @@ export default function TodoList({ todos, theme, tab }) { } ``` -```js src/List.js +```js {expectedErrors: {'react-compiler': [5, 6]}} src/List.js import { memo } from 'react'; const List = memo(function List({ items }) { @@ -855,7 +856,7 @@ export default function TodoList({ todos, theme, tab }) { } ``` -```js src/List.js +```js {expectedErrors: {'react-compiler': [5, 6]}} src/List.js import { memo } from 'react'; const List = memo(function List({ items }) { @@ -1127,7 +1128,7 @@ function ChatRoom({ roomId }) { serverUrl: 'https://localhost:1234', roomId: roomId } - + const connection = createConnection(options); connection.connect(); return () => connection.disconnect(); @@ -1371,7 +1372,7 @@ When you find which dependency breaks memoization, either find a way to remove i Suppose the `Chart` component is wrapped in [`memo`](/reference/react/memo). You want to skip re-rendering every `Chart` in the list when the `ReportList` component re-renders. However, you can't call `useMemo` in a loop: -```js {5-11} +```js {expectedErrors: {'react-compiler': [6]}} {5-11} function ReportList({ items }) { return (
diff --git a/src/content/reference/react/useRef.md b/src/content/reference/react/useRef.md index 8ab53aef3..e87ef6b8a 100644 --- a/src/content/reference/react/useRef.md +++ b/src/content/reference/react/useRef.md @@ -197,7 +197,7 @@ React expects that the body of your component [behaves like a pure function](/le Reading or writing a ref **during rendering** breaks these expectations. -```js {3-4,6-7} +```js {expectedErrors: {'react-compiler': [4]}} {3-4,6-7} function MyComponent() { // ... // 🚩 Don't write a ref during rendering diff --git a/src/content/reference/react/useTransition.md b/src/content/reference/react/useTransition.md index 527078143..923b6c0c9 100644 --- a/src/content/reference/react/useTransition.md +++ b/src/content/reference/react/useTransition.md @@ -161,7 +161,7 @@ function CheckoutForm() { } ``` -The function passed to `startTransition` is called the "Action". You can update state and (optionally) perform side effects within an Action, and the work will be done in the background without blocking user interactions on the page. A Transition can include multiple Actions, and while a Transition is in progress, your UI stays responsive. For example, if the user clicks a tab but then changes their mind and clicks another tab, the second click will be immediately handled without waiting for the first update to finish. +The function passed to `startTransition` is called the "Action". You can update state and (optionally) perform side effects within an Action, and the work will be done in the background without blocking user interactions on the page. A Transition can include multiple Actions, and while a Transition is in progress, your UI stays responsive. For example, if the user clicks a tab but then changes their mind and clicks another tab, the second click will be immediately handled without waiting for the first update to finish. To give the user feedback about in-progress Transitions, the `isPending` state switches to `true` at the first call to `startTransition`, and stays `true` until all Actions complete and the final state is shown to the user. Transitions ensure side effects in Actions to complete in order to [prevent unwanted loading indicators](#preventing-unwanted-loading-indicators), and you can provide immediate feedback while the Transition is in progress with `useOptimistic`. @@ -597,7 +597,7 @@ export default function TabButton({ action, children, isActive }) { + ); + }; +} + +const RedButton = makeButton('red'); +const BlueButton = makeButton('blue'); +``` + +Pass [JSX as children](/learn/passing-props-to-a-component#passing-jsx-as-children) instead: + +```js +// ✅ Better: Pass JSX as children +function Button({color, children}) { + return ( + + ); +} + +function App() { + return ( + <> + + + + ); +} +``` diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/config.md b/src/content/reference/eslint-plugin-react-hooks/lints/config.md new file mode 100644 index 000000000..719e08412 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/config.md @@ -0,0 +1,90 @@ +--- +title: config +--- + + + +Validates the compiler [configuration options](/reference/react-compiler/configuration). + + + +## Rule Details {/*rule-details*/} + +React Compiler accepts various [configuration options](/reference/react-compiler/configuration) to control its behavior. This rule validates that your configuration uses correct option names and value types, preventing silent failures from typos or incorrect settings. + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Unknown option name +module.exports = { + plugins: [ + ['babel-plugin-react-compiler', { + compileMode: 'all' // Typo: should be compilationMode + }] + ] +}; + +// ❌ Invalid option value +module.exports = { + plugins: [ + ['babel-plugin-react-compiler', { + compilationMode: 'everything' // Invalid: use 'all' or 'infer' + }] + ] +}; +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Valid compiler configuration +module.exports = { + plugins: [ + ['babel-plugin-react-compiler', { + compilationMode: 'infer', + panicThreshold: 'critical_errors' + }] + ] +}; +``` + +## Troubleshooting {/*troubleshooting*/} + +### Configuration not working as expected {/*config-not-working*/} + +Your compiler configuration might have typos or incorrect values: + +```js +// ❌ Wrong: Common configuration mistakes +module.exports = { + plugins: [ + ['babel-plugin-react-compiler', { + // Typo in option name + compilationMod: 'all', + // Wrong value type + panicThreshold: true, + // Unknown option + optimizationLevel: 'max' + }] + ] +}; +``` + +Check the [configuration documentation](/reference/react-compiler/configuration) for valid options: + +```js +// ✅ Better: Valid configuration +module.exports = { + plugins: [ + ['babel-plugin-react-compiler', { + compilationMode: 'all', // or 'infer' + panicThreshold: 'none', // or 'critical_errors', 'all_errors' + // Only use documented options + }] + ] +}; +``` diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/error-boundaries.md b/src/content/reference/eslint-plugin-react-hooks/lints/error-boundaries.md new file mode 100644 index 000000000..830098e5b --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/error-boundaries.md @@ -0,0 +1,72 @@ +--- +title: error-boundaries +--- + + + +Validates usage of Error Boundaries instead of try/catch for errors in child components. + + + +## Rule Details {/*rule-details*/} + +Try/catch blocks can't catch errors that happen during React's rendering process. Errors thrown in rendering methods or hooks bubble up through the component tree. Only [Error Boundaries](/reference/react/Component#catching-rendering-errors-with-an-error-boundary) can catch these errors. + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js {expectedErrors: {'react-compiler': [4]}} +// ❌ Try/catch won't catch render errors +function Parent() { + try { + return ; // If this throws, catch won't help + } catch (error) { + return
Error occurred
; + } +} +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Using error boundary +function Parent() { + return ( + + + + ); +} +``` + +## Troubleshooting {/*troubleshooting*/} + +### Why is the linter telling me not to wrap `use` in `try`/`catch`? {/*why-is-the-linter-telling-me-not-to-wrap-use-in-trycatch*/} + +The `use` hook doesn't throw errors in the traditional sense, it suspends component execution. When `use` encounters a pending promise, it suspends the component and lets React show a fallback. Only Suspense and Error Boundaries can handle these cases. The linter warns against `try`/`catch` around `use` to prevent confusion as the `catch` block would never run. + +```js {expectedErrors: {'react-compiler': [5]}} +// ❌ Try/catch around `use` hook +function Component({promise}) { + try { + const data = use(promise); // Won't catch - `use` suspends, not throws + return
{data}
; + } catch (error) { + return
Failed to load
; // Unreachable + } +} + +// ✅ Error boundary catches `use` errors +function App() { + return ( + Failed to load
}> + Loading...}> + + + + ); +} +``` \ No newline at end of file diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/exhaustive-deps.md b/src/content/reference/eslint-plugin-react-hooks/lints/exhaustive-deps.md new file mode 100644 index 000000000..cd26483a1 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/exhaustive-deps.md @@ -0,0 +1,155 @@ +--- +title: exhaustive-deps +--- + + + +Validates that dependency arrays for React hooks contain all necessary dependencies. + + + +## Rule Details {/*rule-details*/} + +React hooks like `useEffect`, `useMemo`, and `useCallback` accept dependency arrays. When a value referenced inside these hooks isn't included in the dependency array, React won't re-run the effect or recalculate the value when that dependency changes. This causes stale closures where the hook uses outdated values. + +## Common Violations {/*common-violations*/} + +This error often happens when you try to "trick" React about dependencies to control when an effect runs. Effects should synchronize your component with external systems. The dependency array tells React which values the effect uses, so React knows when to re-synchronize. + +If you find yourself fighting with the linter, you likely need to restructure your code. See [Removing Effect Dependencies](/learn/removing-effect-dependencies) to learn how. + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Missing dependency +useEffect(() => { + console.log(count); +}, []); // Missing 'count' + +// ❌ Missing prop +useEffect(() => { + fetchUser(userId); +}, []); // Missing 'userId' + +// ❌ Incomplete dependencies +useMemo(() => { + return items.sort(sortOrder); +}, [items]); // Missing 'sortOrder' +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ All dependencies included +useEffect(() => { + console.log(count); +}, [count]); + +// ✅ All dependencies included +useEffect(() => { + fetchUser(userId); +}, [userId]); +``` + +## Troubleshooting {/*troubleshooting*/} + +### Adding a function dependency causes infinite loops {/*function-dependency-loops*/} + +You have an effect, but you're creating a new function on every render: + +```js +// ❌ Causes infinite loop +const logItems = () => { + console.log(items); +}; + +useEffect(() => { + logItems(); +}, [logItems]); // Infinite loop! +``` + +In most cases, you don't need the effect. Call the function where the action happens instead: + +```js +// ✅ Call it from the event handler +const logItems = () => { + console.log(items); +}; + +return ; + +// ✅ Or derive during render if there's no side effect +items.forEach(item => { + console.log(item); +}); +``` + +If you genuinely need the effect (for example, to subscribe to something external), make the dependency stable: + +```js +// ✅ useCallback keeps the function reference stable +const logItems = useCallback(() => { + console.log(items); +}, [items]); + +useEffect(() => { + logItems(); +}, [logItems]); + +// ✅ Or move the logic straight into the effect +useEffect(() => { + console.log(items); +}, [items]); +``` + +### Running an effect only once {/*effect-on-mount*/} + +You want to run an effect once on mount, but the linter complains about missing dependencies: + +```js +// ❌ Missing dependency +useEffect(() => { + sendAnalytics(userId); +}, []); // Missing 'userId' +``` + +Either include the dependency (recommended) or use a ref if you truly need to run once: + +```js +// ✅ Include dependency +useEffect(() => { + sendAnalytics(userId); +}, [userId]); + +// ✅ Or use a ref guard inside an effect +const sent = useRef(false); + +useEffect(() => { + if (sent.current) { + return; + } + + sent.current = true; + sendAnalytics(userId); +}, [userId]); +``` + +## Options {/*options*/} + +This rule accepts an options object: + +```js +{ + "rules": { + "react-hooks/exhaustive-deps": ["warn", { + "additionalHooks": "(useMyCustomHook|useAnotherHook)" + }] + } +} +``` + +- `additionalHooks`: Regex for hooks that should be checked for exhaustive dependencies diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/gating.md b/src/content/reference/eslint-plugin-react-hooks/lints/gating.md new file mode 100644 index 000000000..3bd662a86 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/gating.md @@ -0,0 +1,72 @@ +--- +title: gating +--- + + + +Validates configuration of [gating mode](/reference/react-compiler/gating). + + + +## Rule Details {/*rule-details*/} + +Gating mode lets you gradually adopt React Compiler by marking specific components for optimization. This rule ensures your gating configuration is valid so the compiler knows which components to process. + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Missing required fields +module.exports = { + plugins: [ + ['babel-plugin-react-compiler', { + gating: { + importSpecifierName: '__experimental_useCompiler' + // Missing 'source' field + } + }] + ] +}; + +// ❌ Invalid gating type +module.exports = { + plugins: [ + ['babel-plugin-react-compiler', { + gating: '__experimental_useCompiler' // Should be object + }] + ] +}; +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Complete gating configuration +module.exports = { + plugins: [ + ['babel-plugin-react-compiler', { + gating: { + importSpecifierName: 'isCompilerEnabled', // exported function name + source: 'featureFlags' // module name + } + }] + ] +}; + +// featureFlags.js +export function isCompilerEnabled() { + // ... +} + +// ✅ No gating (compile everything) +module.exports = { + plugins: [ + ['babel-plugin-react-compiler', { + // No gating field - compiles all components + }] + ] +}; +``` diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/globals.md b/src/content/reference/eslint-plugin-react-hooks/lints/globals.md new file mode 100644 index 000000000..fe0cbe008 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/globals.md @@ -0,0 +1,84 @@ +--- +title: globals +--- + + + +Validates against assignment/mutation of globals during render, part of ensuring that [side effects must run outside of render](/reference/rules/components-and-hooks-must-be-pure#side-effects-must-run-outside-of-render). + + + +## Rule Details {/*rule-details*/} + +Global variables exist outside React's control. When you modify them during render, you break React's assumption that rendering is pure. This can cause components to behave differently in development vs production, break Fast Refresh, and make your app impossible to optimize with features like React Compiler. + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Global counter +let renderCount = 0; +function Component() { + renderCount++; // Mutating global + return
Count: {renderCount}
; +} + +// ❌ Modifying window properties +function Component({userId}) { + window.currentUser = userId; // Global mutation + return
User: {userId}
; +} + +// ❌ Global array push +const events = []; +function Component({event}) { + events.push(event); // Mutating global array + return
Events: {events.length}
; +} + +// ❌ Cache manipulation +const cache = {}; +function Component({id}) { + if (!cache[id]) { + cache[id] = fetchData(id); // Modifying cache during render + } + return
{cache[id]}
; +} +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Use state for counters +function Component() { + const [clickCount, setClickCount] = useState(0); + + const handleClick = () => { + setClickCount(c => c + 1); + }; + + return ( + + ); +} + +// ✅ Use context for global values +function Component() { + const user = useContext(UserContext); + return
User: {user.id}
; +} + +// ✅ Synchronize external state with React +function Component({title}) { + useEffect(() => { + document.title = title; // OK in effect + }, [title]); + + return
Page: {title}
; +} +``` diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/immutability.md b/src/content/reference/eslint-plugin-react-hooks/lints/immutability.md new file mode 100644 index 000000000..2314cde06 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/immutability.md @@ -0,0 +1,161 @@ +--- +title: immutability +--- + + + +Validates against mutating props, state, and other values that [are immutable](/reference/rules/components-and-hooks-must-be-pure#props-and-state-are-immutable). + + + +## Rule Details {/*rule-details*/} + +A component’s props and state are immutable snapshots. Never mutate them directly. Instead, pass new props down, and use the setter function from `useState`. + +## Common Violations {/*common-violations*/} + +### Invalid {/*invalid*/} + +```js +// ❌ Array push mutation +function Component() { + const [items, setItems] = useState([1, 2, 3]); + + const addItem = () => { + items.push(4); // Mutating! + setItems(items); // Same reference, no re-render + }; +} + +// ❌ Object property assignment +function Component() { + const [user, setUser] = useState({name: 'Alice'}); + + const updateName = () => { + user.name = 'Bob'; // Mutating! + setUser(user); // Same reference + }; +} + +// ❌ Sort without spreading +function Component() { + const [items, setItems] = useState([3, 1, 2]); + + const sortItems = () => { + setItems(items.sort()); // sort mutates! + }; +} +``` + +### Valid {/*valid*/} + +```js +// ✅ Create new array +function Component() { + const [items, setItems] = useState([1, 2, 3]); + + const addItem = () => { + setItems([...items, 4]); // New array + }; +} + +// ✅ Create new object +function Component() { + const [user, setUser] = useState({name: 'Alice'}); + + const updateName = () => { + setUser({...user, name: 'Bob'}); // New object + }; +} +``` + +## Troubleshooting {/*troubleshooting*/} + +### I need to add items to an array {/*add-items-array*/} + +Mutating arrays with methods like `push()` won't trigger re-renders: + +```js +// ❌ Wrong: Mutating the array +function TodoList() { + const [todos, setTodos] = useState([]); + + const addTodo = (id, text) => { + todos.push({id, text}); + setTodos(todos); // Same array reference! + }; + + return ( +
    + {todos.map(todo =>
  • {todo.text}
    • )} +
+ ); +} +``` + +Create a new array instead: + +```js +// ✅ Better: Create a new array +function TodoList() { + const [todos, setTodos] = useState([]); + + const addTodo = (id, text) => { + setTodos([...todos, {id, text}]); + // Or: setTodos(todos => [...todos, {id: Date.now(), text}]) + }; + + return ( +
    + {todos.map(todo =>
  • {todo.text}
    • )} +
+ ); +} +``` + +### I need to update nested objects {/*update-nested-objects*/} + +Mutating nested properties doesn't trigger re-renders: + +```js +// ❌ Wrong: Mutating nested object +function UserProfile() { + const [user, setUser] = useState({ + name: 'Alice', + settings: { + theme: 'light', + notifications: true + } + }); + + const toggleTheme = () => { + user.settings.theme = 'dark'; // Mutation! + setUser(user); // Same object reference + }; +} +``` + +Spread at each level that needs updating: + +```js +// ✅ Better: Create new objects at each level +function UserProfile() { + const [user, setUser] = useState({ + name: 'Alice', + settings: { + theme: 'light', + notifications: true + } + }); + + const toggleTheme = () => { + setUser({ + ...user, + settings: { + ...user.settings, + theme: 'dark' + } + }); + }; +} +``` \ No newline at end of file diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/incompatible-library.md b/src/content/reference/eslint-plugin-react-hooks/lints/incompatible-library.md new file mode 100644 index 000000000..e057e1978 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/incompatible-library.md @@ -0,0 +1,138 @@ +--- +title: incompatible-library +--- + + + +Validates against usage of libraries which are incompatible with memoization (manual or automatic). + + + + + +These libraries were designed before React's memoization rules were fully documented. They made the correct choices at the time to optimize for ergonomic ways to keep components just the right amount of reactive as app state changes. While these legacy patterns worked, we have since discovered that it's incompatible with React's programming model. We will continue working with library authors to migrate these libraries to use patterns that follow the Rules of React. + + + +## Rule Details {/*rule-details*/} + +Some libraries use patterns that aren't supported by React. When the linter detects usages of these APIs from a [known list](https://github.com/facebook/react/blob/main/compiler/packages/babel-plugin-react-compiler/src/HIR/DefaultModuleTypeProvider.ts), it flags them under this rule. This means that React Compiler can automatically skip over components that use these incompatible APIs, in order to avoid breaking your app. + +```js +// Example of how memoization breaks with these libraries +function Form() { + const { watch } = useForm(); + + // ❌ This value will never update, even when 'name' field changes + const name = useMemo(() => watch('name'), [watch]); + + return
Name: {name}
; // UI appears "frozen" +} +``` + +React Compiler automatically memoizes values following the Rules of React. If something breaks with manual `useMemo`, it will also break the compiler's automatic optimization. This rule helps identify these problematic patterns. + + + +#### Designing APIs that follow the Rules of React {/*designing-apis-that-follow-the-rules-of-react*/} + +One question to think about when designing a library API or hook is whether calling the API can be safely memoized with `useMemo`. If it can't, then both manual and React Compiler memoizations will break your user's code. + +For example, one such incompatible pattern is "interior mutability". Interior mutability is when an object or function keeps its own hidden state that changes over time, even though the reference to it stays the same. Think of it like a box that looks the same on the outside but secretly rearranges its contents. React can't tell anything changed because it only checks if you gave it a different box, not what's inside. This breaks memoization, since React relies on the outer object (or function) changing if part of its value has changed. + +As a rule of thumb, when designing React APIs, think about whether `useMemo` would break it: + +```js +function Component() { + const { someFunction } = useLibrary(); + // it should always be safe to memoize functions like this + const result = useMemo(() => someFunction(), [someFunction]); +} +``` + +Instead, design APIs that return immutable state and use explicit update functions: + +```js +// ✅ Good: Return immutable state that changes reference when updated +function Component() { + const { field, updateField } = useLibrary(); + // this is always safe to memo + const greeting = useMemo(() => `Hello, ${field.name}!`, [field.name]); + + return ( +
+ updateField('name', e.target.value)} + /> +

{greeting}

+
+ ); +} +``` + + + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ react-hook-form `watch` +function Component() { + const {watch} = useForm(); + const value = watch('field'); // Interior mutability + return
{value}
; +} + +// ❌ TanStack Table `useReactTable` +function Component({data}) { + const table = useReactTable({ + data, + columns, + getCoreRowModel: getCoreRowModel(), + }); + // table instance uses interior mutability + return ; +} +``` + + + +#### MobX {/*mobx*/} + +MobX patterns like `observer` also break memoization assumptions, but the linter does not yet detect them. If you rely on MobX and find that your app doesn't work with React Compiler, you may need to use the `"use no memo" directive`. + +```js +// ❌ MobX `observer` +const Component = observer(() => { + const [timer] = useState(() => new Timer()); + return Seconds passed: {timer.secondsPassed}; +}); +``` + + + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ For react-hook-form, use `useWatch`: +function Component() { + const {register, control} = useForm(); + const watchedValue = useWatch({ + control, + name: 'field' + }); + + return ( + <> + +
Current value: {watchedValue}
+ + ); +} +``` + +Some other libraries do not yet have alternative APIs that are compatible with React's memoization model. If the linter doesn't automatically skip over your components or hooks that call these APIs, please [file an issue](https://github.com/facebook/react/issues) so we can add it to the linter. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization.md b/src/content/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization.md new file mode 100644 index 000000000..93b582b1e --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization.md @@ -0,0 +1,93 @@ +--- +title: preserve-manual-memoization +--- + + + +Validates that existing manual memoization is preserved by the compiler. React Compiler will only compile components and hooks if its inference [matches or exceeds the existing manual memoization](/learn/react-compiler/introduction#what-should-i-do-about-usememo-usecallback-and-reactmemo). + + + +## Rule Details {/*rule-details*/} + +React Compiler preserves your existing `useMemo`, `useCallback`, and `React.memo` calls. If you've manually memoized something, the compiler assumes you had a good reason and won't remove it. However, incomplete dependencies prevent the compiler from understanding your code's data flow and applying further optimizations. + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Missing dependencies in useMemo +function Component({ data, filter }) { + const filtered = useMemo( + () => data.filter(filter), + [data] // Missing 'filter' dependency + ); + + return ; +} + +// ❌ Missing dependencies in useCallback +function Component({ onUpdate, value }) { + const handleClick = useCallback(() => { + onUpdate(value); + }, [onUpdate]); // Missing 'value' + + return ; +} +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Complete dependencies +function Component({ data, filter }) { + const filtered = useMemo( + () => data.filter(filter), + [data, filter] // All dependencies included + ); + + return ; +} + +// ✅ Or let the compiler handle it +function Component({ data, filter }) { + // No manual memoization needed + const filtered = data.filter(filter); + return ; +} +``` + +## Troubleshooting {/*troubleshooting*/} + +### Should I remove my manual memoization? {/*remove-manual-memoization*/} + +You might wonder if React Compiler makes manual memoization unnecessary: + +```js +// Do I still need this? +function Component({items, sortBy}) { + const sorted = useMemo(() => { + return [...items].sort((a, b) => { + return a[sortBy] - b[sortBy]; + }); + }, [items, sortBy]); + + return ; +} +``` + +You can safely remove it if using React Compiler: + +```js +// ✅ Better: Let the compiler optimize +function Component({items, sortBy}) { + const sorted = [...items].sort((a, b) => { + return a[sortBy] - b[sortBy]; + }); + + return ; +} +``` \ No newline at end of file diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/purity.md b/src/content/reference/eslint-plugin-react-hooks/lints/purity.md new file mode 100644 index 000000000..af8aacc61 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/purity.md @@ -0,0 +1,83 @@ +--- +title: purity +--- + + + +Validates that [components/hooks are pure](/reference/rules/components-and-hooks-must-be-pure) by checking that they do not call known-impure functions. + + + +## Rule Details {/*rule-details*/} + +React components must be pure functions - given the same props, they should always return the same JSX. When components use functions like `Math.random()` or `Date.now()` during render, they produce different output each time, breaking React's assumptions and causing bugs like hydration mismatches, incorrect memoization, and unpredictable behavior. + +## Common Violations {/*common-violations*/} + +In general, any API that returns a different value for the same inputs violates this rule. Usual examples include: + +- `Math.random()` +- `Date.now()` / `new Date()` +- `crypto.randomUUID()` +- `performance.now()` + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Math.random() in render +function Component() { + const id = Math.random(); // Different every render + return
Content
; +} + +// ❌ Date.now() for values +function Component() { + const timestamp = Date.now(); // Changes every render + return
Created at: {timestamp}
; +} +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Stable IDs from initial state +function Component() { + const [id] = useState(() => crypto.randomUUID()); + return
Content
; +} +``` + +## Troubleshooting {/*troubleshooting*/} + +### I need to show the current time {/*current-time*/} + +Calling `Date.now()` during render makes your component impure: + +```js {expectedErrors: {'react-compiler': [3]}} +// ❌ Wrong: Time changes every render +function Clock() { + return
Current time: {Date.now()}
; +} +``` + +Instead, [move the impure function outside of render](/reference/rules/components-and-hooks-must-be-pure#components-and-hooks-must-be-idempotent): + +```js +function Clock() { + const [time, setTime] = useState(() => Date.now()); + + useEffect(() => { + const interval = setInterval(() => { + setTime(Date.now()); + }, 1000); + + return () => clearInterval(interval); + }, []); + + return
Current time: {time}
; +} +``` \ No newline at end of file diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/refs.md b/src/content/reference/eslint-plugin-react-hooks/lints/refs.md new file mode 100644 index 000000000..3108fdd89 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/refs.md @@ -0,0 +1,115 @@ +--- +title: refs +--- + + + +Validates correct usage of refs, not reading/writing during render. See the "pitfalls" section in [`useRef()` usage](/reference/react/useRef#usage). + + + +## Rule Details {/*rule-details*/} + +Refs hold values that aren't used for rendering. Unlike state, changing a ref doesn't trigger a re-render. Reading or writing `ref.current` during render breaks React's expectations. Refs might not be initialized when you try to read them, and their values can be stale or inconsistent. + +## How It Detects Refs {/*how-it-detects-refs*/} + +The lint only applies these rules to values it knows are refs. A value is inferred as a ref when the compiler sees any of the following patterns: + +- Returned from `useRef()` or `React.createRef()`. + + ```js + const scrollRef = useRef(null); + ``` + +- An identifier named `ref` or ending in `Ref` that reads from or writes to `.current`. + + ```js + buttonRef.current = node; + ``` + +- Passed through a JSX `ref` prop (for example `
`). + + ```jsx + + ``` + +Once something is marked as a ref, that inference follows the value through assignments, destructuring, or helper calls. This lets the lint surface violations even when `ref.current` is accessed inside another function that received the ref as an argument. + +## Common Violations {/*common-violations*/} + +- Reading `ref.current` during render +- Updating `refs` during render +- Using `refs` for values that should be state + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Reading ref during render +function Component() { + const ref = useRef(0); + const value = ref.current; // Don't read during render + return
{value}
; +} + +// ❌ Modifying ref during render +function Component({value}) { + const ref = useRef(null); + ref.current = value; // Don't modify during render + return
; +} +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Read ref in effects/handlers +function Component() { + const ref = useRef(null); + + useEffect(() => { + if (ref.current) { + console.log(ref.current.offsetWidth); // OK in effect + } + }); + + return
; +} + +// ✅ Use state for UI values +function Component() { + const [count, setCount] = useState(0); + + return ( + + ); +} + +// ✅ Lazy initialization of ref value +function Component() { + const ref = useRef(null); + + // Initialize only once on first use + if (ref.current === null) { + ref.current = expensiveComputation(); // OK - lazy initialization + } + + const handleClick = () => { + console.log(ref.current); // Use the initialized value + }; + + return ; +} +``` + +## Troubleshooting {/*troubleshooting*/} + +### The lint flagged my plain object with `.current` {/*plain-object-current*/} + +The name heuristic intentionally treats `ref.current` and `fooRef.current` as real refs. If you're modeling a custom container object, pick a different name (for example, `box`) or move the mutable value into state. Renaming avoids the lint because the compiler stops inferring it as a ref. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/rules-of-hooks.md b/src/content/reference/eslint-plugin-react-hooks/lints/rules-of-hooks.md new file mode 100644 index 000000000..6508fc867 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/rules-of-hooks.md @@ -0,0 +1,161 @@ +--- +title: rules-of-hooks +--- + + + +Validates that components and hooks follow the [Rules of Hooks](/reference/rules/rules-of-hooks). + + + +## Rule Details {/*rule-details*/} + +React relies on the order in which hooks are called to correctly preserve state between renders. Each time your component renders, React expects the exact same hooks to be called in the exact same order. When hooks are called conditionally or in loops, React loses track of which state corresponds to which hook call, leading to bugs like state mismatches and "Rendered fewer/more hooks than expected" errors. + +## Common Violations {/*common-violations*/} + +These patterns violate the Rules of Hooks: + +- **Hooks in conditions** (`if`/`else`, ternary, `&&`/`||`) +- **Hooks in loops** (`for`, `while`, `do-while`) +- **Hooks after early returns** +- **Hooks in callbacks/event handlers** +- **Hooks in async functions** +- **Hooks in class methods** +- **Hooks at module level** + + + +### `use` hook {/*use-hook*/} + +The `use` hook is different from other React hooks. You can call it conditionally and in loops: + +```js +// ✅ `use` can be conditional +if (shouldFetch) { + const data = use(fetchPromise); +} + +// ✅ `use` can be in loops +for (const promise of promises) { + results.push(use(promise)); +} +``` + +However, `use` still has restrictions: +- Can't be wrapped in try/catch +- Must be called inside a component or hook + +Learn more: [`use` API Reference](/reference/react/use) + + + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Hook in condition +if (isLoggedIn) { + const [user, setUser] = useState(null); +} + +// ❌ Hook after early return +if (!data) return ; +const [processed, setProcessed] = useState(data); + +// ❌ Hook in callback + + ); +} + +// ✅ Derive from props instead of setting state +function Component({user}) { + const name = user?.name || ''; + const email = user?.email || ''; + return
{name}
; +} +``` + +## Troubleshooting {/*troubleshooting*/} + +### I want to sync state to a prop {/*clamp-state-to-prop*/} + +A common problem is trying to "fix" state after it renders. Suppose you want to keep a counter from exceeding a `max` prop: + +```js +// ❌ Wrong: clamps during render +function Counter({max}) { + const [count, setCount] = useState(0); + + if (count > max) { + setCount(max); + } + + return ( + + ); +} +``` + +As soon as `count` exceeds `max`, an infinite loop is triggered. + +Instead, it's often better to move this logic to the event (the place where the state is first set). For example, you can enforce the maximum at the moment you update state: + +```js +// ✅ Clamp when updating +function Counter({max}) { + const [count, setCount] = useState(0); + + const increment = () => { + setCount(current => Math.min(current + 1, max)); + }; + + return ; +} +``` + +Now the setter only runs in response to the click, React finishes the render normally, and `count` never crosses `max`. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/static-components.md b/src/content/reference/eslint-plugin-react-hooks/lints/static-components.md new file mode 100644 index 000000000..709303612 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/static-components.md @@ -0,0 +1,103 @@ +--- +title: static-components +--- + + + +Validates that components are static, not recreated every render. Components that are recreated dynamically can reset state and trigger excessive re-rendering. + + + +## Rule Details {/*rule-details*/} + +Components defined inside other components are recreated on every render. React sees each as a brand new component type, unmounting the old one and mounting the new one, destroying all state and DOM nodes in the process. + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Component defined inside component +function Parent() { + const ChildComponent = () => { // New component every render! + const [count, setCount] = useState(0); + return ; + }; + + return ; // State resets every render +} + +// ❌ Dynamic component creation +function Parent({type}) { + const Component = type === 'button' + ? () => + : () =>
Text
; + + return ; +} +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Components at module level +const ButtonComponent = () => ; +const TextComponent = () =>
Text
; + +function Parent({type}) { + const Component = type === 'button' + ? ButtonComponent // Reference existing component + : TextComponent; + + return ; +} +``` + +## Troubleshooting {/*troubleshooting*/} + +### I need to render different components conditionally {/*conditional-components*/} + +You might define components inside to access local state: + +```js {expectedErrors: {'react-compiler': [13]}} +// ❌ Wrong: Inner component to access parent state +function Parent() { + const [theme, setTheme] = useState('light'); + + function ThemedButton() { // Recreated every render! + return ( + + ); + } + + return ; +} +``` + +Pass data as props instead: + +```js +// ✅ Better: Pass props to static component +function ThemedButton({theme}) { + return ( + + ); +} + +function Parent() { + const [theme, setTheme] = useState('light'); + return ; +} +``` + + + +If you find yourself wanting to define components inside other components to access local variables, that's a sign you should be passing props instead. This makes components more reusable and testable. + + \ No newline at end of file diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/unsupported-syntax.md b/src/content/reference/eslint-plugin-react-hooks/lints/unsupported-syntax.md new file mode 100644 index 000000000..a3eefcdb2 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/unsupported-syntax.md @@ -0,0 +1,102 @@ +--- +title: unsupported-syntax +--- + + + +Validates against syntax that React Compiler does not support. If you need to, you can still use this syntax outside of React, such as in a standalone utility function. + + + +## Rule Details {/*rule-details*/} + +React Compiler needs to statically analyze your code to apply optimizations. Features like `eval` and `with` make it impossible to statically understand what the code does at compile time, so the compiler can't optimize components that use them. + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js +// ❌ Using eval in component +function Component({ code }) { + const result = eval(code); // Can't be analyzed + return
{result}
; +} + +// ❌ Using with statement +function Component() { + with (Math) { // Changes scope dynamically + return
{sin(PI / 2)}
; + } +} + +// ❌ Dynamic property access with eval +function Component({propName}) { + const value = eval(`props.${propName}`); + return
{value}
; +} +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Use normal property access +function Component({propName, props}) { + const value = props[propName]; // Analyzable + return
{value}
; +} + +// ✅ Use standard Math methods +function Component() { + return
{Math.sin(Math.PI / 2)}
; +} +``` + +## Troubleshooting {/*troubleshooting*/} + +### I need to evaluate dynamic code {/*evaluate-dynamic-code*/} + +You might need to evaluate user-provided code: + +```js {expectedErrors: {'react-compiler': [3]}} +// ❌ Wrong: eval in component +function Calculator({expression}) { + const result = eval(expression); // Unsafe and unoptimizable + return
Result: {result}
; +} +``` + +Use a safe expression parser instead: + +```js +// ✅ Better: Use a safe parser +import {evaluate} from 'mathjs'; // or similar library + +function Calculator({expression}) { + const [result, setResult] = useState(null); + + const calculate = () => { + try { + // Safe mathematical expression evaluation + setResult(evaluate(expression)); + } catch (error) { + setResult('Invalid expression'); + } + }; + + return ( +
+ + {result &&
Result: {result}
} +
+ ); +} +``` + + + +Never use `eval` with user input - it's a security risk. Use dedicated parsing libraries for specific use cases like mathematical expressions, JSON parsing, or template evaluation. + + \ No newline at end of file diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/use-memo.md b/src/content/reference/eslint-plugin-react-hooks/lints/use-memo.md new file mode 100644 index 000000000..54bbe1579 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/use-memo.md @@ -0,0 +1,94 @@ +--- +title: use-memo +--- + + + +Validates usage of the `useMemo` hook without a return value. See [`useMemo` docs](/reference/react/useMemo) for more information. + + + +## Rule Details {/*rule-details*/} + +`useMemo` is for computing and caching expensive values, not for side effects. Without a return value, `useMemo` returns `undefined`, which defeats its purpose and likely indicates you're using the wrong hook. + +### Invalid {/*invalid*/} + +Examples of incorrect code for this rule: + +```js {expectedErrors: {'react-compiler': [3]}} +// ❌ No return value +function Component({ data }) { + const processed = useMemo(() => { + data.forEach(item => console.log(item)); + // Missing return! + }, [data]); + + return
{processed}
; // Always undefined +} +``` + +### Valid {/*valid*/} + +Examples of correct code for this rule: + +```js +// ✅ Returns computed value +function Component({ data }) { + const processed = useMemo(() => { + return data.map(item => item * 2); + }, [data]); + + return
{processed}
; +} +``` + +## Troubleshooting {/*troubleshooting*/} + +### I need to run side effects when dependencies change {/*side-effects*/} + +You might try to use `useMemo` for side effects: + +{/* TODO(@poteto) fix compiler validation to check for unassigned useMemos */} +```js {expectedErrors: {'react-compiler': [4]}} +// ❌ Wrong: Side effects in useMemo +function Component({user}) { + // No return value, just side effect + useMemo(() => { + analytics.track('UserViewed', {userId: user.id}); + }, [user.id]); + + // Not assigned to a variable + useMemo(() => { + return analytics.track('UserViewed', {userId: user.id}); + }, [user.id]); +} +``` + +If the side effect needs to happen in response to user interaction, it's best to colocate the side effect with the event: + +```js +// ✅ Good: Side effects in event handlers +function Component({user}) { + const handleClick = () => { + analytics.track('ButtonClicked', {userId: user.id}); + // Other click logic... + }; + + return ; +} +``` + +If the side effect sychronizes React state with some external state (or vice versa), use `useEffect`: + +```js +// ✅ Good: Synchronization in useEffect +function Component({theme}) { + useEffect(() => { + localStorage.setItem('preferredTheme', theme); + document.body.className = theme; + }, [theme]); + + return
Current theme: {theme}
; +} +``` diff --git a/src/content/reference/react/index.md b/src/content/reference/react/index.md index 6d899f548..ccba58a06 100644 --- a/src/content/reference/react/index.md +++ b/src/content/reference/react/index.md @@ -37,6 +37,12 @@ The React Compiler is a build-time optimization tool that automatically memoizes * [Directives](/reference/react-compiler/directives) - Function-level directives to control compilation. * [Compiling Libraries](/reference/react-compiler/compiling-libraries) - Guide for shipping pre-compiled library code. +## ESLint Plugin React Hooks {/*eslint-plugin-react-hooks*/} + +The [ESLint plugin for React Hooks](/reference/eslint-plugin-react-hooks) helps enforce the Rules of React: + +* [Lints](/reference/eslint-plugin-react-hooks) - Detailed documentation for each lint with examples. + ## Rules of React {/*rules-of-react*/} React has idioms — or rules — for how to express patterns in a way that is easy to understand and yields high-quality applications: diff --git a/src/sidebarReference.json b/src/sidebarReference.json index 18fbd4097..325c216c1 100644 --- a/src/sidebarReference.json +++ b/src/sidebarReference.json @@ -373,6 +373,84 @@ "title": "Compiling Libraries", "path": "/reference/react-compiler/compiling-libraries" }, + { + "hasSectionHeader": true, + "sectionHeader": "eslint-plugin-react-hooks" + }, + { + "title": "Lints", + "path": "/reference/eslint-plugin-react-hooks", + "routes": [ + { + "title": "component-hook-factories", + "path": "/reference/eslint-plugin-react-hooks/lints/component-hook-factories" + }, + { + "title": "config", + "path": "/reference/eslint-plugin-react-hooks/lints/config" + }, + { + "title": "error-boundaries", + "path": "/reference/eslint-plugin-react-hooks/lints/error-boundaries" + }, + { + "title": "exhaustive-deps", + "path": "/reference/eslint-plugin-react-hooks/lints/exhaustive-deps" + }, + { + "title": "gating", + "path": "/reference/eslint-plugin-react-hooks/lints/gating" + }, + { + "title": "globals", + "path": "/reference/eslint-plugin-react-hooks/lints/globals" + }, + { + "title": "immutability", + "path": "/reference/eslint-plugin-react-hooks/lints/immutability" + }, + { + "title": "incompatible-library", + "path": "/reference/eslint-plugin-react-hooks/lints/incompatible-library" + }, + { + "title": "preserve-manual-memoization", + "path": "/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization" + }, + { + "title": "purity", + "path": "/reference/eslint-plugin-react-hooks/lints/purity" + }, + { + "title": "refs", + "path": "/reference/eslint-plugin-react-hooks/lints/refs" + }, + { + "title": "rules-of-hooks", + "path": "/reference/eslint-plugin-react-hooks/lints/rules-of-hooks" + }, + { + "title": "set-state-in-effect", + "path": "/reference/eslint-plugin-react-hooks/lints/set-state-in-effect" + }, + { + "title": "set-state-in-render", + "path": "/reference/eslint-plugin-react-hooks/lints/set-state-in-render" + }, + { + "title": "static-components", + "path": "/reference/eslint-plugin-react-hooks/lints/static-components" + }, + { + "title": "unsupported-syntax", + "path": "/reference/eslint-plugin-react-hooks/lints/unsupported-syntax" + }, + { + "title": "use-memo", + "path": "/reference/eslint-plugin-react-hooks/lints/use-memo" + } + ] + }, { "hasSectionHeader": true, "sectionHeader": "Rules of React" From c8211fc21ead0cee9c59e9f77ded9e8c65d72775 Mon Sep 17 00:00:00 2001 From: Ricky Date: Mon, 22 Sep 2025 10:18:10 -0400 Subject: [PATCH 11/15] Add RC badge to RC-only lint rules (#8005) --- src/components/Layout/Sidebar/SidebarLink.tsx | 8 ++- src/components/MDX/ExpandableCallout.tsx | 10 +++ src/components/MDX/MDXComponents.tsx | 5 ++ src/components/PageHeading.tsx | 8 ++- .../eslint-plugin-react-hooks/index.md | 20 +++++- .../lints/component-hook-factories.md | 9 +++ .../eslint-plugin-react-hooks/lints/config.md | 9 +++ .../lints/error-boundaries.md | 9 +++ .../eslint-plugin-react-hooks/lints/gating.md | 9 +++ .../lints/globals.md | 9 +++ .../lints/immutability.md | 9 +++ .../lints/incompatible-library.md | 9 +++ .../lints/preserve-manual-memoization.md | 9 +++ .../eslint-plugin-react-hooks/lints/purity.md | 9 +++ .../eslint-plugin-react-hooks/lints/refs.md | 9 +++ .../lints/set-state-in-effect.md | 9 +++ .../lints/set-state-in-render.md | 9 +++ .../lints/static-components.md | 9 +++ .../lints/unsupported-syntax.md | 9 +++ .../lints/use-memo.md | 9 +++ src/content/reference/react/cache.md | 1 - src/sidebarReference.json | 63 ++++++++++++------- 22 files changed, 221 insertions(+), 29 deletions(-) diff --git a/src/components/Layout/Sidebar/SidebarLink.tsx b/src/components/Layout/Sidebar/SidebarLink.tsx index 5c01fefc3..9650e95fa 100644 --- a/src/components/Layout/Sidebar/SidebarLink.tsx +++ b/src/components/Layout/Sidebar/SidebarLink.tsx @@ -24,7 +24,7 @@ interface SidebarLinkProps { selected?: boolean; title: string; level: number; - version?: 'canary' | 'major' | 'experimental'; + version?: 'canary' | 'major' | 'experimental' | 'rc'; icon?: React.ReactNode; isExpanded?: boolean; hideArrow?: boolean; @@ -102,6 +102,12 @@ export function SidebarLink({ className="ms-1 text-gray-30 dark:text-gray-60 inline-block w-3.5 h-3.5 align-[-3px]" /> )} + {version === 'rc' && ( + + )}
{isExpanded != null && !hideArrow && ( diff --git a/src/components/MDX/ExpandableCallout.tsx b/src/components/MDX/ExpandableCallout.tsx index ba93d3e27..5b7491e11 100644 --- a/src/components/MDX/ExpandableCallout.tsx +++ b/src/components/MDX/ExpandableCallout.tsx @@ -24,6 +24,7 @@ type CalloutVariants = | 'wip' | 'canary' | 'experimental' + | 'rc' | 'major' | 'rsc'; @@ -50,6 +51,15 @@ const variantMap = { overlayGradient: 'linear-gradient(rgba(245, 249, 248, 0), rgba(245, 249, 248, 1)', }, + rc: { + title: 'RC', + Icon: IconCanary, + containerClasses: + 'bg-gray-5 dark:bg-gray-60 dark:bg-opacity-20 text-primary dark:text-primary-dark text-lg', + textColor: 'text-gray-60 dark:text-gray-30', + overlayGradient: + 'linear-gradient(rgba(245, 249, 248, 0), rgba(245, 249, 248, 1)', + }, canary: { title: 'Canary', Icon: IconCanary, diff --git a/src/components/MDX/MDXComponents.tsx b/src/components/MDX/MDXComponents.tsx index 7a258370c..a32dad271 100644 --- a/src/components/MDX/MDXComponents.tsx +++ b/src/components/MDX/MDXComponents.tsx @@ -106,6 +106,10 @@ const Canary = ({children}: {children: React.ReactNode}) => ( {children} ); +const RC = ({children}: {children: React.ReactNode}) => ( + {children} +); + const Experimental = ({children}: {children: React.ReactNode}) => ( {children} ); @@ -533,6 +537,7 @@ export const MDXComponents = { Math, MathI, Note, + RC, Canary, Experimental, ExperimentalBadge, diff --git a/src/components/PageHeading.tsx b/src/components/PageHeading.tsx index 760542750..ee92f5e55 100644 --- a/src/components/PageHeading.tsx +++ b/src/components/PageHeading.tsx @@ -19,7 +19,7 @@ import {IconExperimental} from './Icon/IconExperimental'; interface PageHeadingProps { title: string; - version?: 'experimental' | 'canary'; + version?: 'experimental' | 'canary' | 'rc'; experimental?: boolean; status?: string; description?: string; @@ -46,6 +46,12 @@ function PageHeading({ className="ms-4 mt-1 text-gray-50 dark:text-gray-40 inline-block w-6 h-6 align-[-1px]" /> )} + {version === 'rc' && ( + + )} {version === 'experimental' && ( @@ -8,6 +9,14 @@ title: eslint-plugin-react-hooks + + +These docs include rules available in the RC version of `eslint-plugin-react-hooks`. + +You can try them by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + This plugin helps you catch violations of React's rules at build time, ensuring your components and hooks follow React's rules for correctness and performance. The lints cover both fundamental React patterns (exhaustive-deps and rules-of-hooks) and issues flagged by React Compiler. React Compiler diagnostics are automatically surfaced by this ESLint plugin, and can be used even if your app hasn't adopted the compiler yet. @@ -18,10 +27,16 @@ What this means for linting, is that you don’t need to fix all violations imme ## Available Lints {/*available-lints*/} -* [`component-hook-factories`](/reference/eslint-plugin-react-hooks/lints/component-hook-factories) - Validates against higher order functions defining nested components or hooks +These rules are available in the stable version of `eslint-plugin-react-hooks`: + +* [`exhaustive-deps`](/reference/eslint-plugin-react-hooks/lints/exhaustive-deps) - Validates that dependency arrays for React hooks contain all necessary dependencies +* [`rules-of-hooks`](/reference/eslint-plugin-react-hooks/lints/rules-of-hooks) - Validates that components and hooks follow the Rules of Hooks + +These rules are available in the RC version of `eslint-plugin-react-hooks`: + +* [`component-hook-factories`](/reference/eslint-plugin-react-hooks/lints/component-hook-factories) - Validates higher order functions defining nested components or hooks * [`config`](/reference/eslint-plugin-react-hooks/lints/config) - Validates the compiler configuration options * [`error-boundaries`](/reference/eslint-plugin-react-hooks/lints/error-boundaries) - Validates usage of Error Boundaries instead of try/catch for child errors -* [`exhaustive-deps`](/reference/eslint-plugin-react-hooks/lints/exhaustive-deps) - Validates that dependency arrays for React hooks contain all necessary dependencies * [`gating`](/reference/eslint-plugin-react-hooks/lints/gating) - Validates configuration of gating mode * [`globals`](/reference/eslint-plugin-react-hooks/lints/globals) - Validates against assignment/mutation of globals during render * [`immutability`](/reference/eslint-plugin-react-hooks/lints/immutability) - Validates against mutating props, state, and other immutable values @@ -29,7 +44,6 @@ What this means for linting, is that you don’t need to fix all violations imme * [`preserve-manual-memoization`](/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization) - Validates that existing manual memoization is preserved by the compiler * [`purity`](/reference/eslint-plugin-react-hooks/lints/purity) - Validates that components/hooks are pure by checking known-impure functions * [`refs`](/reference/eslint-plugin-react-hooks/lints/refs) - Validates correct usage of refs, not reading/writing during render -* [`rules-of-hooks`](/reference/eslint-plugin-react-hooks/lints/rules-of-hooks) - Validates that components and hooks follow the Rules of Hooks * [`set-state-in-effect`](/reference/eslint-plugin-react-hooks/lints/set-state-in-effect) - Validates against calling setState synchronously in an effect * [`set-state-in-render`](/reference/eslint-plugin-react-hooks/lints/set-state-in-render) - Validates against setting state during render * [`static-components`](/reference/eslint-plugin-react-hooks/lints/static-components) - Validates that components are static, not recreated every render diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/component-hook-factories.md b/src/content/reference/eslint-plugin-react-hooks/lints/component-hook-factories.md index 537903abd..44d23d758 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/component-hook-factories.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/component-hook-factories.md @@ -1,5 +1,6 @@ --- title: component-hook-factories +version: rc --- @@ -8,6 +9,14 @@ Validates against higher order functions defining nested components or hooks. Co + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} Defining components or hooks inside other functions creates new instances on every call. React treats each as a completely different component, destroying and recreating the entire component tree, losing all state, and causing performance problems. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/config.md b/src/content/reference/eslint-plugin-react-hooks/lints/config.md index 719e08412..f7e099752 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/config.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/config.md @@ -1,5 +1,6 @@ --- title: config +version: rc --- @@ -8,6 +9,14 @@ Validates the compiler [configuration options](/reference/react-compiler/configu + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} React Compiler accepts various [configuration options](/reference/react-compiler/configuration) to control its behavior. This rule validates that your configuration uses correct option names and value types, preventing silent failures from typos or incorrect settings. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/error-boundaries.md b/src/content/reference/eslint-plugin-react-hooks/lints/error-boundaries.md index 830098e5b..bd013f532 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/error-boundaries.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/error-boundaries.md @@ -1,5 +1,6 @@ --- title: error-boundaries +version: rc --- @@ -8,6 +9,14 @@ Validates usage of Error Boundaries instead of try/catch for errors in child com + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} Try/catch blocks can't catch errors that happen during React's rendering process. Errors thrown in rendering methods or hooks bubble up through the component tree. Only [Error Boundaries](/reference/react/Component#catching-rendering-errors-with-an-error-boundary) can catch these errors. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/gating.md b/src/content/reference/eslint-plugin-react-hooks/lints/gating.md index 3bd662a86..fdbbadf0e 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/gating.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/gating.md @@ -1,5 +1,6 @@ --- title: gating +version: rc --- @@ -8,6 +9,14 @@ Validates configuration of [gating mode](/reference/react-compiler/gating). + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} Gating mode lets you gradually adopt React Compiler by marking specific components for optimization. This rule ensures your gating configuration is valid so the compiler knows which components to process. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/globals.md b/src/content/reference/eslint-plugin-react-hooks/lints/globals.md index fe0cbe008..b9a20d4db 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/globals.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/globals.md @@ -1,5 +1,6 @@ --- title: globals +version: rc --- @@ -8,6 +9,14 @@ Validates against assignment/mutation of globals during render, part of ensuring + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} Global variables exist outside React's control. When you modify them during render, you break React's assumption that rendering is pure. This can cause components to behave differently in development vs production, break Fast Refresh, and make your app impossible to optimize with features like React Compiler. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/immutability.md b/src/content/reference/eslint-plugin-react-hooks/lints/immutability.md index 2314cde06..9376271eb 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/immutability.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/immutability.md @@ -1,5 +1,6 @@ --- title: immutability +version: rc --- @@ -8,6 +9,14 @@ Validates against mutating props, state, and other values that [are immutable](/ + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} A component’s props and state are immutable snapshots. Never mutate them directly. Instead, pass new props down, and use the setter function from `useState`. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/incompatible-library.md b/src/content/reference/eslint-plugin-react-hooks/lints/incompatible-library.md index e057e1978..aa5877503 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/incompatible-library.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/incompatible-library.md @@ -1,5 +1,6 @@ --- title: incompatible-library +version: rc --- @@ -8,6 +9,14 @@ Validates against usage of libraries which are incompatible with memoization (ma + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + These libraries were designed before React's memoization rules were fully documented. They made the correct choices at the time to optimize for ergonomic ways to keep components just the right amount of reactive as app state changes. While these legacy patterns worked, we have since discovered that it's incompatible with React's programming model. We will continue working with library authors to migrate these libraries to use patterns that follow the Rules of React. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization.md b/src/content/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization.md index 93b582b1e..2f296ac56 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization.md @@ -1,5 +1,6 @@ --- title: preserve-manual-memoization +version: rc --- @@ -8,6 +9,14 @@ Validates that existing manual memoization is preserved by the compiler. React C + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} React Compiler preserves your existing `useMemo`, `useCallback`, and `React.memo` calls. If you've manually memoized something, the compiler assumes you had a good reason and won't remove it. However, incomplete dependencies prevent the compiler from understanding your code's data flow and applying further optimizations. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/purity.md b/src/content/reference/eslint-plugin-react-hooks/lints/purity.md index af8aacc61..14c870fb5 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/purity.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/purity.md @@ -1,5 +1,6 @@ --- title: purity +version: rc --- @@ -8,6 +9,14 @@ Validates that [components/hooks are pure](/reference/rules/components-and-hooks + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} React components must be pure functions - given the same props, they should always return the same JSX. When components use functions like `Math.random()` or `Date.now()` during render, they produce different output each time, breaking React's assumptions and causing bugs like hydration mismatches, incorrect memoization, and unpredictable behavior. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/refs.md b/src/content/reference/eslint-plugin-react-hooks/lints/refs.md index 3108fdd89..78776ba57 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/refs.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/refs.md @@ -1,5 +1,6 @@ --- title: refs +version: rc --- @@ -8,6 +9,14 @@ Validates correct usage of refs, not reading/writing during render. See the "pit + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} Refs hold values that aren't used for rendering. Unlike state, changing a ref doesn't trigger a re-render. Reading or writing `ref.current` during render breaks React's expectations. Refs might not be initialized when you try to read them, and their values can be stale or inconsistent. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/set-state-in-effect.md b/src/content/reference/eslint-plugin-react-hooks/lints/set-state-in-effect.md index 8c6a7cb47..df285fedf 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/set-state-in-effect.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/set-state-in-effect.md @@ -1,5 +1,6 @@ --- title: set-state-in-effect +version: rc --- @@ -8,6 +9,14 @@ Validates against calling setState synchronously in an effect, which can lead to + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} Setting state immediately inside an effect forces React to restart the entire render cycle. When you update state in an effect, React must re-render your component, apply changes to the DOM, and then run effects again. This creates an extra render pass that could have been avoided by transforming data directly during render or deriving state from props. Transform data at the top level of your component instead. This code will naturally re-run when props or state change without triggering additional render cycles. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/set-state-in-render.md b/src/content/reference/eslint-plugin-react-hooks/lints/set-state-in-render.md index 61852990a..c8cfa22a0 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/set-state-in-render.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/set-state-in-render.md @@ -1,5 +1,6 @@ --- title: set-state-in-render +version: rc --- @@ -8,6 +9,14 @@ Validates against setting state during render, which can trigger additional rend + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} Calling `setState` during render triggers another render before the current one finishes. This creates an infinite loop that crashes your app. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/static-components.md b/src/content/reference/eslint-plugin-react-hooks/lints/static-components.md index 709303612..06945838f 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/static-components.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/static-components.md @@ -1,5 +1,6 @@ --- title: static-components +version: rc --- @@ -8,6 +9,14 @@ Validates that components are static, not recreated every render. Components tha + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} Components defined inside other components are recreated on every render. React sees each as a brand new component type, unmounting the old one and mounting the new one, destroying all state and DOM nodes in the process. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/unsupported-syntax.md b/src/content/reference/eslint-plugin-react-hooks/lints/unsupported-syntax.md index a3eefcdb2..3f3e04d53 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/unsupported-syntax.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/unsupported-syntax.md @@ -1,5 +1,6 @@ --- title: unsupported-syntax +version: rc --- @@ -8,6 +9,14 @@ Validates against syntax that React Compiler does not support. If you need to, y + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} React Compiler needs to statically analyze your code to apply optimizations. Features like `eval` and `with` make it impossible to statically understand what the code does at compile time, so the compiler can't optimize components that use them. diff --git a/src/content/reference/eslint-plugin-react-hooks/lints/use-memo.md b/src/content/reference/eslint-plugin-react-hooks/lints/use-memo.md index 54bbe1579..db022a802 100644 --- a/src/content/reference/eslint-plugin-react-hooks/lints/use-memo.md +++ b/src/content/reference/eslint-plugin-react-hooks/lints/use-memo.md @@ -1,5 +1,6 @@ --- title: use-memo +version: rc --- @@ -8,6 +9,14 @@ Validates usage of the `useMemo` hook without a return value. See [`useMemo` doc + + +This rule is available in the RC version of `eslint-plugin-react-hooks`. + +You can try it by upgrading the lint plugin [to the most recent RC version](/learn/react-compiler/installation#eslint-integration). + + + ## Rule Details {/*rule-details*/} `useMemo` is for computing and caching expensive values, not for side effects. Without a return value, `useMemo` returns `undefined`, which defeats its purpose and likely indicates you're using the wrong hook. diff --git a/src/content/reference/react/cache.md b/src/content/reference/react/cache.md index c82543479..04836f19d 100644 --- a/src/content/reference/react/cache.md +++ b/src/content/reference/react/cache.md @@ -1,6 +1,5 @@ --- title: cache -canary: true --- diff --git a/src/sidebarReference.json b/src/sidebarReference.json index 325c216c1..8823effb2 100644 --- a/src/sidebarReference.json +++ b/src/sidebarReference.json @@ -381,73 +381,90 @@ "title": "Lints", "path": "/reference/eslint-plugin-react-hooks", "routes": [ + { + "title": "exhaustive-deps", + "path": "/reference/eslint-plugin-react-hooks/lints/exhaustive-deps" + }, + { + "title": "rules-of-hooks", + "path": "/reference/eslint-plugin-react-hooks/lints/rules-of-hooks" + }, { "title": "component-hook-factories", - "path": "/reference/eslint-plugin-react-hooks/lints/component-hook-factories" + "path": "/reference/eslint-plugin-react-hooks/lints/component-hook-factories", + "version": "rc" }, { "title": "config", - "path": "/reference/eslint-plugin-react-hooks/lints/config" + "path": "/reference/eslint-plugin-react-hooks/lints/config", + "version": "rc" }, { "title": "error-boundaries", - "path": "/reference/eslint-plugin-react-hooks/lints/error-boundaries" - }, - { - "title": "exhaustive-deps", - "path": "/reference/eslint-plugin-react-hooks/lints/exhaustive-deps" + "path": "/reference/eslint-plugin-react-hooks/lints/error-boundaries", + "version": "rc" }, { "title": "gating", - "path": "/reference/eslint-plugin-react-hooks/lints/gating" + "path": "/reference/eslint-plugin-react-hooks/lints/gating", + "version": "rc" }, { "title": "globals", - "path": "/reference/eslint-plugin-react-hooks/lints/globals" + "path": "/reference/eslint-plugin-react-hooks/lints/globals", + "version": "rc" }, { "title": "immutability", - "path": "/reference/eslint-plugin-react-hooks/lints/immutability" + "path": "/reference/eslint-plugin-react-hooks/lints/immutability", + "version": "rc" }, { "title": "incompatible-library", - "path": "/reference/eslint-plugin-react-hooks/lints/incompatible-library" + "path": "/reference/eslint-plugin-react-hooks/lints/incompatible-library", + "version": "rc" }, + { "title": "preserve-manual-memoization", - "path": "/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization" + "path": "/reference/eslint-plugin-react-hooks/lints/preserve-manual-memoization", + "version": "rc" }, { "title": "purity", - "path": "/reference/eslint-plugin-react-hooks/lints/purity" + "path": "/reference/eslint-plugin-react-hooks/lints/purity", + "version": "rc" }, { "title": "refs", - "path": "/reference/eslint-plugin-react-hooks/lints/refs" - }, - { - "title": "rules-of-hooks", - "path": "/reference/eslint-plugin-react-hooks/lints/rules-of-hooks" + "path": "/reference/eslint-plugin-react-hooks/lints/refs", + "version": "rc" }, + { "title": "set-state-in-effect", - "path": "/reference/eslint-plugin-react-hooks/lints/set-state-in-effect" + "path": "/reference/eslint-plugin-react-hooks/lints/set-state-in-effect", + "version": "rc" }, { "title": "set-state-in-render", - "path": "/reference/eslint-plugin-react-hooks/lints/set-state-in-render" + "path": "/reference/eslint-plugin-react-hooks/lints/set-state-in-render", + "version": "rc" }, { "title": "static-components", - "path": "/reference/eslint-plugin-react-hooks/lints/static-components" + "path": "/reference/eslint-plugin-react-hooks/lints/static-components", + "version": "rc" }, { "title": "unsupported-syntax", - "path": "/reference/eslint-plugin-react-hooks/lints/unsupported-syntax" + "path": "/reference/eslint-plugin-react-hooks/lints/unsupported-syntax", + "version": "rc" }, { "title": "use-memo", - "path": "/reference/eslint-plugin-react-hooks/lints/use-memo" + "path": "/reference/eslint-plugin-react-hooks/lints/use-memo", + "version": "rc" } ] }, From 170e5b904a157050177095e5bedcea490973e37d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rado=C5=A1=20Mili=C4=87ev?= <40705899+rammba@users.noreply.github.com> Date: Tue, 23 Sep 2025 09:58:55 +0200 Subject: [PATCH 12/15] Remove unnecessary spaces from useCallback.md (#8006) --- src/content/reference/react/useCallback.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/content/reference/react/useCallback.md b/src/content/reference/react/useCallback.md index 9a1520f44..ed774d92c 100644 --- a/src/content/reference/react/useCallback.md +++ b/src/content/reference/react/useCallback.md @@ -52,7 +52,7 @@ export default function ProductPage({ productId, referrer, theme }) { On the initial render, `useCallback` returns the `fn` function you have passed. -During subsequent renders, it will either return an already stored `fn` function from the last render (if the dependencies haven't changed), or return the `fn` function you have passed during this render. +During subsequent renders, it will either return an already stored `fn` function from the last render (if the dependencies haven't changed), or return the `fn` function you have passed during this render. #### Caveats {/*caveats*/} @@ -224,7 +224,7 @@ function useCallback(fn, dependencies) { If your app is like this site, and most interactions are coarse (like replacing a page or an entire section), memoization is usually unnecessary. On the other hand, if your app is more like a drawing editor, and most interactions are granular (like moving shapes), then you might find memoization very helpful. -Caching a function with `useCallback` is only valuable in a few cases: +Caching a function with `useCallback` is only valuable in a few cases: - You pass it as a prop to a component wrapped in [`memo`.](/reference/react/memo) You want to skip re-rendering if the value hasn't changed. Memoization lets your component re-render only if dependencies changed. - The function you're passing is later used as a dependency of some Hook. For example, another function wrapped in `useCallback` depends on it, or you depend on this function from [`useEffect.`](/reference/react/useEffect) From 790625fd221a079b06325df027d69f684b161b75 Mon Sep 17 00:00:00 2001 From: Eugene Choi <4eugenechoi@gmail.com> Date: Tue, 23 Sep 2025 17:25:52 -0400 Subject: [PATCH 13/15] Fix ViewTransition examples (#7999) * Fix view transition example * Empty commit * Fix fullscreen example --- src/content/reference/react/ViewTransition.md | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/src/content/reference/react/ViewTransition.md b/src/content/reference/react/ViewTransition.md index 653a06a63..14ed136f9 100644 --- a/src/content/reference/react/ViewTransition.md +++ b/src/content/reference/react/ViewTransition.md @@ -159,7 +159,11 @@ Enter/Exit Transitions trigger when a `` is added or removed by ```js function Child() { - return Hi + return ( + +
Hi
+ + ); } function Parent() { @@ -352,11 +356,7 @@ button:hover { ```js [3, 5] function Component() { - return ( -
- Hi -
- ); + return Hi; } ``` @@ -519,7 +519,6 @@ button:hover { background-image: conic-gradient(at top right, #c76a15, #a6423a, #2b3491); } .thumbnail.fullscreen { - height: 100%; width: 100%; } .video { From 1b20061b1097c11a4c30387a487980801c89e73d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rado=C5=A1=20Mili=C4=87ev?= <40705899+rammba@users.noreply.github.com> Date: Fri, 26 Sep 2025 18:15:37 +0200 Subject: [PATCH 14/15] Fix value wrongly formatted as code in useDeferredValue.md (#8024) --- src/content/reference/react/useDeferredValue.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/content/reference/react/useDeferredValue.md b/src/content/reference/react/useDeferredValue.md index bf716b173..40cb92629 100644 --- a/src/content/reference/react/useDeferredValue.md +++ b/src/content/reference/react/useDeferredValue.md @@ -420,7 +420,7 @@ input { margin: 10px; } You can think of it as happening in two steps: -1. **First, React re-renders with the new `query` (`"ab"`) but with the old `deferredQuery` (still `"a")`.** The `deferredQuery` value, which you pass to the result list, is *deferred:* it "lags behind" the `query` value. +1. **First, React re-renders with the new `query` (`"ab"`) but with the old `deferredQuery` (still `"a"`).** The `deferredQuery` value, which you pass to the result list, is *deferred:* it "lags behind" the `query` value. 2. **In the background, React tries to re-render with *both* `query` and `deferredQuery` updated to `"ab"`.** If this re-render completes, React will show it on the screen. However, if it suspends (the results for `"ab"` have not loaded yet), React will abandon this rendering attempt, and retry this re-render again after the data has loaded. The user will keep seeing the stale deferred value until the data is ready. From 49c2d26722fb1b5865ce0221a4cadc71b615e4cf Mon Sep 17 00:00:00 2001 From: Jack Pope Date: Sun, 28 Sep 2025 11:36:27 -0400 Subject: [PATCH 15/15] Update useEffectEvent docs for canary (#8025) * Update useEffectEvent docs for canary * Clean up prefixed imports * Fix import * Update blog post link --- ...labs-view-transitions-activity-and-more.md | 2 +- src/content/learn/escape-hatches.md | 6 +- .../learn/removing-effect-dependencies.md | 32 +++--- .../learn/reusing-logic-with-custom-hooks.md | 32 +++--- .../learn/separating-events-from-effects.md | 88 ++++++++------- .../react/experimental_useEffectEvent.md | 31 ------ src/content/reference/react/useEffect.md | 10 +- src/content/reference/react/useEffectEvent.md | 102 ++++++++++++++++++ src/sidebarReference.json | 5 + vercel.json | 5 + 10 files changed, 203 insertions(+), 110 deletions(-) delete mode 100644 src/content/reference/react/experimental_useEffectEvent.md create mode 100644 src/content/reference/react/useEffectEvent.md diff --git a/src/content/blog/2025/04/23/react-labs-view-transitions-activity-and-more.md b/src/content/blog/2025/04/23/react-labs-view-transitions-activity-and-more.md index c7f740091..5d2c59b76 100644 --- a/src/content/blog/2025/04/23/react-labs-view-transitions-activity-and-more.md +++ b/src/content/blog/2025/04/23/react-labs-view-transitions-activity-and-more.md @@ -14303,7 +14303,7 @@ useEffect(() => { }); // compiler inserted dependencies. ``` -With this code, the React Compiler can infer the dependencies for you and insert them automatically so you don't need to see or write them. With features like [the IDE extension](#compiler-ide-extension) and [`useEffectEvent`](/reference/react/experimental_useEffectEvent), we can provide a CodeLens to show you what the Compiler inserted for times you need to debug, or to optimize by removing a dependency. This helps reinforce the correct mental model for writing Effects, which can run at any time to synchronize your component or hook's state with something else. +With this code, the React Compiler can infer the dependencies for you and insert them automatically so you don't need to see or write them. With features like [the IDE extension](#compiler-ide-extension) and [`useEffectEvent`](/reference/react/useEffectEvent), we can provide a CodeLens to show you what the Compiler inserted for times you need to debug, or to optimize by removing a dependency. This helps reinforce the correct mental model for writing Effects, which can run at any time to synchronize your component or hook's state with something else. Our hope is that automatically inserting dependencies is not only easier to write, but that it also makes them easier to understand by forcing you to think in terms of what the Effect does, and not in component lifecycles. diff --git a/src/content/learn/escape-hatches.md b/src/content/learn/escape-hatches.md index 0b2d595b2..e6b050e0e 100644 --- a/src/content/learn/escape-hatches.md +++ b/src/content/learn/escape-hatches.md @@ -455,8 +455,8 @@ This is not ideal. You want to re-connect to the chat only if the `roomId` has c ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest", "toastify-js": "1.12.0" }, @@ -471,7 +471,7 @@ This is not ideal. You want to re-connect to the chat only if the `roomId` has c ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; import { createConnection, sendMessage } from './chat.js'; import { showNotification } from './notifications.js'; diff --git a/src/content/learn/removing-effect-dependencies.md b/src/content/learn/removing-effect-dependencies.md index 7ab6dbc1f..fb98a0cd1 100644 --- a/src/content/learn/removing-effect-dependencies.md +++ b/src/content/learn/removing-effect-dependencies.md @@ -609,11 +609,13 @@ function ChatRoom({ roomId }) { ### Do you want to read a value without "reacting" to its changes? {/*do-you-want-to-read-a-value-without-reacting-to-its-changes*/} - + -This section describes an **experimental API that has not yet been released** in a stable version of React. +**The `useEffectEvent` API is currently only available in React’s Canary and Experimental channels.** - +[Learn more about React’s release channels here.](/community/versioning-policy#all-release-channels) + + Suppose that you want to play a sound when the user receives a new message unless `isMuted` is `true`: @@ -1262,8 +1264,8 @@ Is there a line of code inside the Effect that should not be reactive? How can y ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -1277,7 +1279,7 @@ Is there a line of code inside the Effect that should not be reactive? How can y ```js import { useState, useEffect, useRef } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; import { FadeInAnimation } from './animation.js'; function Welcome({ duration }) { @@ -1389,8 +1391,8 @@ Your Effect needs to read the latest value of `duration`, but you don't want it ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -1405,7 +1407,7 @@ Your Effect needs to read the latest value of `duration`, but you don't want it ```js import { useState, useEffect, useRef } from 'react'; import { FadeInAnimation } from './animation.js'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; function Welcome({ duration }) { const ref = useRef(null); @@ -1825,8 +1827,8 @@ Another of these functions only exists to pass some state to an imported API met ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest", "toastify-js": "1.12.0" }, @@ -1907,7 +1909,7 @@ export default function App() { ```js src/ChatRoom.js active import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; export default function ChatRoom({ roomId, createConnection, onMessage }) { useEffect(() => { @@ -2120,8 +2122,8 @@ As a result, the chat re-connects only when something meaningful (`roomId` or `i ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest", "toastify-js": "1.12.0" }, @@ -2189,7 +2191,7 @@ export default function App() { ```js src/ChatRoom.js active import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; import { createEncryptedConnection, createUnencryptedConnection, diff --git a/src/content/learn/reusing-logic-with-custom-hooks.md b/src/content/learn/reusing-logic-with-custom-hooks.md index de68dd190..2038e59e1 100644 --- a/src/content/learn/reusing-logic-with-custom-hooks.md +++ b/src/content/learn/reusing-logic-with-custom-hooks.md @@ -837,11 +837,13 @@ Every time your `ChatRoom` component re-renders, it passes the latest `roomId` a ### Passing event handlers to custom Hooks {/*passing-event-handlers-to-custom-hooks*/} - + -This section describes an **experimental API that has not yet been released** in a stable version of React. +**The `useEffectEvent` API is currently only available in React’s Canary and Experimental channels.** - +[Learn more about React’s release channels here.](/community/versioning-policy#all-release-channels) + + As you start using `useChatRoom` in more components, you might want to let components customize its behavior. For example, currently, the logic for what to do when a message arrives is hardcoded inside the Hook: @@ -985,7 +987,7 @@ export default function ChatRoom({ roomId }) { ```js src/useChatRoom.js import { useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; import { createConnection } from './chat.js'; export function useChatRoom({ serverUrl, roomId, onReceiveMessage }) { @@ -1070,8 +1072,8 @@ export function showNotification(message, theme = 'dark') { ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest", "toastify-js": "1.12.0" }, @@ -1666,7 +1668,7 @@ export default function App() { ```js src/useFadeIn.js active import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; export function useFadeIn(ref, duration) { const [isRunning, setIsRunning] = useState(true); @@ -1719,8 +1721,8 @@ html, body { min-height: 300px; } ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -2208,8 +2210,8 @@ It looks like your `useInterval` Hook accepts an event listener as an argument. ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -2252,7 +2254,7 @@ export function useCounter(delay) { ```js src/useInterval.js import { useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; export function useInterval(onTick, delay) { useEffect(() => { @@ -2279,8 +2281,8 @@ With this change, both intervals work as expected and don't interfere with each ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -2324,7 +2326,7 @@ export function useCounter(delay) { ```js src/useInterval.js active import { useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; export function useInterval(callback, delay) { const onTick = useEffectEvent(callback); diff --git a/src/content/learn/separating-events-from-effects.md b/src/content/learn/separating-events-from-effects.md index fd603c395..2a19e0f13 100644 --- a/src/content/learn/separating-events-from-effects.md +++ b/src/content/learn/separating-events-from-effects.md @@ -400,13 +400,15 @@ You need a way to separate this non-reactive logic from the reactive Effect arou ### Declaring an Effect Event {/*declaring-an-effect-event*/} - + -This section describes an **experimental API that has not yet been released** in a stable version of React. +**The `useEffectEvent` API is currently only available in React’s Canary and Experimental channels.** - +[Learn more about React’s release channels here.](/community/versioning-policy#all-release-channels) -Use a special Hook called [`useEffectEvent`](/reference/react/experimental_useEffectEvent) to extract this non-reactive logic out of your Effect: + + +Use a special Hook called [`useEffectEvent`](/reference/react/useEffectEvent) to extract this non-reactive logic out of your Effect: ```js {1,4-6} import { useEffect, useEffectEvent } from 'react'; @@ -448,8 +450,8 @@ Verify that the new behavior works as you would expect: ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest", "toastify-js": "1.12.0" }, @@ -464,7 +466,7 @@ Verify that the new behavior works as you would expect: ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; import { createConnection, sendMessage } from './chat.js'; import { showNotification } from './notifications.js'; @@ -578,11 +580,13 @@ You can think of Effect Events as being very similar to event handlers. The main ### Reading latest props and state with Effect Events {/*reading-latest-props-and-state-with-effect-events*/} - + + +**The `useEffectEvent` API is currently only available in React’s Canary and Experimental channels.** -This section describes an **experimental API that has not yet been released** in a stable version of React. +[Learn more about React’s release channels here.](/community/versioning-policy#all-release-channels) - + Effect Events let you fix many patterns where you might be tempted to suppress the dependency linter. @@ -803,8 +807,8 @@ With `useEffectEvent`, there is no need to "lie" to the linter, and the code wor ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -818,7 +822,7 @@ With `useEffectEvent`, there is no need to "lie" to the linter, and the code wor ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; export default function App() { const [position, setPosition] = useState({ x: 0, y: 0 }); @@ -878,11 +882,13 @@ Read [Removing Effect Dependencies](/learn/removing-effect-dependencies) for oth ### Limitations of Effect Events {/*limitations-of-effect-events*/} - + + +**The `useEffectEvent` API is currently only available in React’s Canary and Experimental channels.** -This section describes an **experimental API that has not yet been released** in a stable version of React. +[Learn more about React’s release channels here.](/community/versioning-policy#all-release-channels) - + Effect Events are very limited in how you can use them: @@ -976,8 +982,8 @@ To fix this code, it's enough to follow the rules. ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -1046,8 +1052,8 @@ If you remove the suppression comment, React will tell you that this Effect's co ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -1124,8 +1130,8 @@ It seems like the Effect which sets up the timer "reacts" to the `increment` val ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -1139,7 +1145,7 @@ It seems like the Effect which sets up the timer "reacts" to the `increment` val ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; export default function Timer() { const [count, setCount] = useState(0); @@ -1193,8 +1199,8 @@ To solve the issue, extract an `onTick` Effect Event from the Effect: ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -1208,7 +1214,7 @@ To solve the issue, extract an `onTick` Effect Event from the Effect: ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; export default function Timer() { const [count, setCount] = useState(0); @@ -1275,8 +1281,8 @@ Code inside Effect Events is not reactive. Are there cases in which you would _w ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -1290,7 +1296,7 @@ Code inside Effect Events is not reactive. Are there cases in which you would _w ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; export default function Timer() { const [count, setCount] = useState(0); @@ -1362,8 +1368,8 @@ The problem with the above example is that it extracted an Effect Event called ` ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -1377,7 +1383,7 @@ The problem with the above example is that it extracted an Effect Event called ` ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; export default function Timer() { const [count, setCount] = useState(0); @@ -1458,8 +1464,8 @@ Your Effect knows which room it connected to. Is there any information that you ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest", "toastify-js": "1.12.0" }, @@ -1474,7 +1480,7 @@ Your Effect knows which room it connected to. Is there any information that you ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; import { createConnection, sendMessage } from './chat.js'; import { showNotification } from './notifications.js'; @@ -1599,8 +1605,8 @@ To fix the issue, instead of reading the *latest* `roomId` inside the Effect Eve ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest", "toastify-js": "1.12.0" }, @@ -1615,7 +1621,7 @@ To fix the issue, instead of reading the *latest* `roomId` inside the Effect Eve ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; import { createConnection, sendMessage } from './chat.js'; import { showNotification } from './notifications.js'; @@ -1736,8 +1742,8 @@ To solve the additional challenge, save the notification timeout ID and clear it ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest", "toastify-js": "1.12.0" }, @@ -1752,7 +1758,7 @@ To solve the additional challenge, save the notification timeout ID and clear it ```js import { useState, useEffect } from 'react'; -import { experimental_useEffectEvent as useEffectEvent } from 'react'; +import { useEffectEvent } from 'react'; import { createConnection, sendMessage } from './chat.js'; import { showNotification } from './notifications.js'; diff --git a/src/content/reference/react/experimental_useEffectEvent.md b/src/content/reference/react/experimental_useEffectEvent.md deleted file mode 100644 index 954cf6587..000000000 --- a/src/content/reference/react/experimental_useEffectEvent.md +++ /dev/null @@ -1,31 +0,0 @@ ---- -title: experimental_useEffectEvent -version: experimental ---- - - - -**This API is experimental and is not available in a stable version of React yet.** - -You can try it by upgrading React packages to the most recent experimental version: - -- `react@experimental` -- `react-dom@experimental` -- `eslint-plugin-react-hooks@experimental` - -Experimental versions of React may contain bugs. Don't use them in production. - - - - - - -`useEffectEvent` is a React Hook that lets you extract non-reactive logic into an [Effect Event.](/learn/separating-events-from-effects#declaring-an-effect-event) - -```js -const onSomething = useEffectEvent(callback) -``` - - - - diff --git a/src/content/reference/react/useEffect.md b/src/content/reference/react/useEffect.md index a250bb15a..7ead26dff 100644 --- a/src/content/reference/react/useEffect.md +++ b/src/content/reference/react/useEffect.md @@ -1691,11 +1691,13 @@ Now that you define the `createOptions` function inside the Effect, the Effect i ### Reading the latest props and state from an Effect {/*reading-the-latest-props-and-state-from-an-effect*/} - + -This section describes an **experimental API that has not yet been released** in a stable version of React. +**The `useEffectEvent` API is currently only available in React’s Canary and Experimental channels.** - +[Learn more about React’s release channels here.](/community/versioning-policy#all-release-channels) + + By default, when you read a reactive value from an Effect, you have to add it as a dependency. This ensures that your Effect "reacts" to every change of that value. For most dependencies, that's the behavior you want. @@ -1710,7 +1712,7 @@ function Page({ url, shoppingCart }) { } ``` -**What if you want to log a new page visit after every `url` change, but *not* if only the `shoppingCart` changes?** You can't exclude `shoppingCart` from dependencies without breaking the [reactivity rules.](#specifying-reactive-dependencies) However, you can express that you *don't want* a piece of code to "react" to changes even though it is called from inside an Effect. [Declare an *Effect Event*](/learn/separating-events-from-effects#declaring-an-effect-event) with the [`useEffectEvent`](/reference/react/experimental_useEffectEvent) Hook, and move the code reading `shoppingCart` inside of it: + **What if you want to log a new page visit after every `url` change, but *not* if only the `shoppingCart` changes?** You can't exclude `shoppingCart` from dependencies without breaking the [reactivity rules.](#specifying-reactive-dependencies) However, you can express that you *don't want* a piece of code to "react" to changes even though it is called from inside an Effect. [Declare an *Effect Event*](/learn/separating-events-from-effects#declaring-an-effect-event) with the [`useEffectEvent`](/reference/react/useEffectEvent) Hook, and move the code reading `shoppingCart` inside of it: ```js {2-4,7,8} function Page({ url, shoppingCart }) { diff --git a/src/content/reference/react/useEffectEvent.md b/src/content/reference/react/useEffectEvent.md new file mode 100644 index 000000000..8792f7ffb --- /dev/null +++ b/src/content/reference/react/useEffectEvent.md @@ -0,0 +1,102 @@ +--- +title: useEffectEvent +version: canary +--- + + + + +**The `useEffectEvent` API is currently only available in React’s Canary and Experimental channels.** + +[Learn more about React’s release channels here.](/community/versioning-policy#all-release-channels) + + + + + +`useEffectEvent` is a React Hook that lets you extract non-reactive logic from your Effects into a reusable function called an [Effect Event](/learn/separating-events-from-effects#declaring-an-effect-event). + +```js +const onSomething = useEffectEvent(callback) +``` + + + + + +## Reference {/*reference*/} + +### `useEffectEvent(callback)` {/*useeffectevent*/} + +Call `useEffectEvent` at the top level of your component to declare an Effect Event. Effect Events are functions you can call inside Effects, such as `useEffect`: + +```js {4-6,11} +import { useEffectEvent, useEffect } from 'react'; + +function ChatRoom({ roomId, theme }) { + const onConnected = useEffectEvent(() => { + showNotification('Connected!', theme); + }); + + useEffect(() => { + const connection = createConnection(serverUrl, roomId); + connection.on('connected', () => { + onConnected(); + }); + connection.connect(); + return () => connection.disconnect(); + }, [roomId]); + + // ... +} +``` + +[See more examples below.](#usage) + +#### Parameters {/*parameters*/} + +- `callback`: A function containing the logic for your Effect Event. When you define an Effect Event with `useEffectEvent`, the `callback` always accesses the latest values from props and state when it is invoked. This helps avoid issues with stale closures. + +#### Returns {/*returns*/} + +Returns an Effect Event function. You can call this function inside `useEffect`, `useLayoutEffect`, or `useInsertionEffect`. + +#### Caveats {/*caveats*/} + +- **Only call inside Effects:** Effect Events should only be called within Effects. Define them just before the Effect that uses them. Do not pass them to other components or hooks. +- **Not a dependency shortcut:** Do not use `useEffectEvent` to avoid specifying dependencies in your Effect's dependency array. This can hide bugs and make your code harder to understand. Prefer explicit dependencies or use refs to compare previous values if needed. +- **Use for non-reactive logic:** Only use `useEffectEvent` to extract logic that does not depend on changing values. + +___ + +## Usage {/*usage*/} + +### Reading the latest props and state {/*reading-the-latest-props-and-state*/} + +Typically, when you access a reactive value inside an Effect, you must include it in the dependency array. This makes sure your Effect runs again whenever that value changes, which is usually the desired behavior. + +But in some cases, you may want to read the most recent props or state inside an Effect without causing the Effect to re-run when those values change. + +To [read the latest props or state](/learn/separating-events-from-effects#reading-latest-props-and-state-with-effect-events) in your Effect, without making those values reactive, include them in an Effect Event. + +```js {7-9,12} +import { useEffect, useContext, useEffectEvent } from 'react'; + +function Page({ url }) { + const { items } = useContext(ShoppingCartContext); + const numberOfItems = items.length; + + const onNavigate = useEffectEvent((visitedUrl) => { + logVisit(visitedUrl, numberOfItems); + }); + + useEffect(() => { + onNavigate(url); + }, [url]); + + // ... +} +``` + +You can pass reactive values like `url` as arguments to the Effect Event. This lets you access the latest values without making your Effect re-run for every change. + diff --git a/src/sidebarReference.json b/src/sidebarReference.json index 8823effb2..67935b459 100644 --- a/src/sidebarReference.json +++ b/src/sidebarReference.json @@ -38,6 +38,11 @@ "title": "useEffect", "path": "/reference/react/useEffect" }, + { + "title": "useEffectEvent", + "path": "/reference/react/useEffectEvent", + "version": "canary" + }, { "title": "useId", "path": "/reference/react/useId" diff --git a/vercel.json b/vercel.json index 1a55e2063..70ddefbe8 100644 --- a/vercel.json +++ b/vercel.json @@ -248,6 +248,11 @@ "source": "/feed.xml", "destination": "/rss.xml", "permanent": true + }, + { + "source": "/reference/react/experimental_useEffectEvent", + "destination": "/reference/react/useEffectEvent", + "permanent": true } ], "headers": [