diff --git a/.eslintrc b/.eslintrc index f8b03f98..7bc6ab93 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/ISSUE_TEMPLATE/3-framework.yml b/.github/ISSUE_TEMPLATE/3-framework.yml index a47295e1..87f03a66 100644 --- a/.github/ISSUE_TEMPLATE/3-framework.yml +++ b/.github/ISSUE_TEMPLATE/3-framework.yml @@ -8,11 +8,11 @@ body: value: | ## Apply to be included as a recommended React framework - _This form is for framework authors to apply to be included as a recommended [React framework](https://react.dev/learn/start-a-new-react-project). If you are not a framework author, please contact the authors before submitting._ + _This form is for framework authors to apply to be included as a recommended [React framework](https://react.dev/learn/creating-a-react-app). If you are not a framework author, please contact the authors before submitting._ Our goal when recommending a framework is to start developers with a React project that solves common problems like code splitting, data fetching, routing, and HTML generation without any extra work later. We believe this will allow users to get started quickly with React, and scale their app to production. - While we understand that many frameworks may want to be featured, this page is not a place to advertise every possible React framework or all frameworks that you can add React to. There are many great frameworks that offer support for React that are not listed in our guides. The frameworks we recommend have invested significantly in the React ecosystem, and collaborated with the React team to be compatible with our [full-stack React architecture vision](https://react.dev/learn/start-a-new-react-project#which-features-make-up-the-react-teams-full-stack-architecture-vision). + While we understand that many frameworks may want to be featured, this page is not a place to advertise every possible React framework or all frameworks that you can add React to. There are many great frameworks that offer support for React that are not listed in our guides. The frameworks we recommend have invested significantly in the React ecosystem, and collaborated with the React team to be compatible with our [full-stack React architecture vision](https://react.dev/learn/creating-a-react-app#which-features-make-up-the-react-teams-full-stack-architecture-vision). To be included, frameworks must meet the following criteria: diff --git a/.gitignore b/.gitignore index 7bf71dbc..99f4615e 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/colors.js b/colors.js index 872f33ca..2b282c82 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/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 00000000..8e7670fd --- /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 00000000..67d6b62b --- /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 00000000..fd542bf0 --- /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 00000000..313b0e30 --- /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 00000000..46e330ac --- /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 00000000..ecefa849 --- /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 00000000..250e0a1e --- /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 00000000..b1f747cc --- /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 00000000..9940fee2 --- /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 00000000..043f2e52 --- /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 00000000..4e433164 --- /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 00000000..5ec32794 --- /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 00000000..d888d131 --- /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 00000000..fb58a37c --- /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 00000000..26d3878e --- /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 00000000..5a7cf126 --- /dev/null +++ b/eslint-local-rules/yarn.lock @@ -0,0 +1,1421 @@ +# THIS IS AN AUTOGENERATED FILE. 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+36,14 @@ const nextConfig = { // Don't bundle the shim unnecessarily. config.resolve.alias['use-sync-external-store/shim'] = 'react'; + // ESLint depends on the CommonJS version of esquery, + // but Webpack loads the ESM version by default. This + // alias ensures the correct version is used. + // + // More info: + // https://github.com/reactjs/react.dev/pull/8115 + config.resolve.alias['esquery'] = 'esquery/dist/esquery.min.js'; + const {IgnorePlugin, NormalModuleReplacementPlugin} = require('webpack'); config.plugins.push( new NormalModuleReplacementPlugin( diff --git a/package.json b/package.json index c1cd1674..c2a84b1e 100644 --- a/package.json +++ b/package.json @@ -7,8 +7,8 @@ "analyze": "ANALYZE=true next build", "dev": "next-remote-watch ./src/content", "build": "next build && node --experimental-modules ./scripts/downloadFonts.mjs", - "lint": "next lint", - "lint:fix": "next lint --fix", + "lint": "next lint && eslint \"src/content/**/*.md\"", + "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", @@ -18,10 +18,12 @@ "ci-check": "npm-run-all prettier:diff --parallel lint tsc lint-heading-ids rss deadlinks", "tsc": "tsc --noEmit", "start": "next start", - "postinstall": "is-ci || husky install .husky", + "postinstall": "yarn --cwd eslint-local-rules install && 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", + "test:eslint-local-rules": "yarn --cwd eslint-local-rules test" }, "dependencies": { "@codesandbox/sandpack-react": "2.13.5", @@ -61,7 +63,7 @@ "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": "^1.0.0", "chalk": "4.1.2", "eslint": "7.x", "eslint-config-next": "12.0.3", @@ -69,6 +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/plugins/markdownToHtml.js b/plugins/markdownToHtml.js index 0d5fe7af..e9b0c3ec 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 356de1bf..c5430ce8 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 4694ff67..c819624b 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 @@ -7,12 +14,24 @@ const visit = require('unist-util-visit'); const retext = require('retext'); const smartypants = require('retext-smartypants'); -function check(parent) { +function check(node, parent) { + if (node.data?.skipSmartyPants) return false; if (parent.tagName === 'script') return false; if (parent.tagName === 'style') return false; return true; } +function markSkip(node) { + if (!node) return; + node.data ??= {}; + node.data.skipSmartyPants = true; + if (Array.isArray(node.children)) { + for (const child of node.children) { + markSkip(child); + } + } +} + module.exports = function (options) { const processor = retext().use(smartypants, { ...options, @@ -36,8 +55,14 @@ module.exports = function (options) { let startIndex = 0; const textOrInlineCodeNodes = []; + visit(tree, 'mdxJsxFlowElement', (node) => { + if (['TerminalBlock'].includes(node.name)) { + markSkip(node); // Mark all children to skip smarty pants + } + }); + visit(tree, ['text', 'inlineCode'], (node, _, parent) => { - if (check(parent)) { + if (check(node, parent)) { if (node.type === 'text') allText += node.value; // for the case when inlineCode contains just one part of quote: `foo'bar` else allText += 'A'.repeat(node.value.length); diff --git a/postcss.config.js b/postcss.config.js index d55c43c9..6b55f927 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/images/blog/react-foundation/react_foundation_logo.png b/public/images/blog/react-foundation/react_foundation_logo.png new file mode 100644 index 00000000..51c19598 Binary files /dev/null and b/public/images/blog/react-foundation/react_foundation_logo.png differ diff --git a/public/images/blog/react-foundation/react_foundation_logo.webp b/public/images/blog/react-foundation/react_foundation_logo.webp new file mode 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/dev/null and b/public/images/docs/performance-tracks/scheduler.png differ diff --git a/public/images/docs/performance-tracks/server-overview.dark.png b/public/images/docs/performance-tracks/server-overview.dark.png new file mode 100644 index 00000000..221fb120 Binary files /dev/null and b/public/images/docs/performance-tracks/server-overview.dark.png differ diff --git a/public/images/docs/performance-tracks/server-overview.png b/public/images/docs/performance-tracks/server-overview.png new file mode 100644 index 00000000..85c7eed2 Binary files /dev/null and b/public/images/docs/performance-tracks/server-overview.png differ diff --git a/public/js/jsfiddle-integration-babel.js b/public/js/jsfiddle-integration-babel.js index 56059472..56133855 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 2151435d..aeae1360 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/copyright.js b/scripts/copyright.js new file mode 100644 index 00000000..f1c6f786 --- /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; +} diff --git a/scripts/deadLinkChecker.js b/scripts/deadLinkChecker.js index 90593b87..46a21cdc 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 e0f3d556..3231b1d7 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 40925d44..79839f51 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 c3cf1ab8..798a63e1 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 54cd500c..f1ed5e0b 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 6b8f75fc..32116752 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 e64b486d..177af2c5 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 65c0151b..6b79a958 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 23c97175..bd98d5b3 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 93c2ca12..158a5497 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 080969ef..77e9ebf7 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 13fe6d3a..ccd91fe9 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 61e4e52c..2d0b9fec 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 a70717c9..81301c04 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 5d461556..ec930923 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 7f584fed..97b9f7ce 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 4d40330c..15f34e15 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 d685fb21..dc4ad7c7 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 755a2ae3..ba61f237 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 500cd4fd..f6213460 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 dfe1a928..121391f3 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 c0e7f49c..be551d83 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 f101f62b..966777fd 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 c0f69e3f..c0dce97f 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 7f1080af..dea2764d 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 1852f52f..06c8f155 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 8bc90ee0..5ab29fa3 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 b802bc79..802382b5 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 79def08e..00d25a90 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 e6e716d0..0f7d4dfe 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 f61175e9..40fde8af 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 dfa13bac..aaf3e815 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 1510c91c..82ed947b 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 ee624789..a80fc7d6 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 b4a6b62f..976203c6 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 457736c7..c5bb2473 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 6208236f..13029ec9 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 91751356..1dda00eb 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 668e41af..b0f1d44b 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 7b3a97a8..66dfd47b 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 9ea0bafd..72ded520 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 e84971f4..01802c25 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 83534ec5..90b7cd41 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 34db728c..fe927251 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 9cdf256f..d11e1469 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 38acfabf..cbf0935b 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. */ @@ -244,12 +251,20 @@ export function HomeContent() { фулл-стекке өтіңіз +<<<<<<< HEAD React - бұл бағдарламалық қосымша. Ол компоненттерді біріктіруге мүмкіндік береді, бірақ маршруттау мен деректерді алу жолын көрсетпейді. React көмегімен толық бағдарлама құру үшін{' '} Next.js немесе{' '} Remix сияқты фулл-стекті ұсынамыз +======= + React is a library. It lets you put components together, but it + doesn’t prescribe how to do routing and data fetching. To build an + entire app with React, we recommend a full-stack React framework + like Next.js or{' '} + React Router. +>>>>>>> 2534424ec6c433cc2c811d5a0bd5a65b75efa5f0 @@ -267,8 +282,13 @@ export function HomeContent() { Фреймворктен бастаңыз +======= + href="/learn/creating-a-react-app"> + Get started with a framework +>>>>>>> 2534424ec6c433cc2c811d5a0bd5a65b75efa5f0 diff --git a/src/components/Layout/Page.tsx b/src/components/Layout/Page.tsx index c3224e51..aa39fe5f 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. */ @@ -8,7 +15,7 @@ import {useRouter} from 'next/router'; import {SidebarNav} from './SidebarNav'; import {Footer} from './Footer'; import {Toc} from './Toc'; -import SocialBanner from '../SocialBanner'; +// import SocialBanner from '../SocialBanner'; import {DocsPageFooter} from 'components/DocsFooter'; import {Seo} from 'components/Seo'; import PageHeading from 'components/PageHeading'; @@ -135,7 +142,7 @@ export function Page({ /> )} - + {/* */} )} + {version === 'rc' && ( + + )} {isExpanded != null && !hideArrow && ( diff --git a/src/components/Layout/Sidebar/SidebarRouteTree.tsx b/src/components/Layout/Sidebar/SidebarRouteTree.tsx index 72003df7..863355bf 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 d0e29154..69664e6b 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 17127096..77beb4d7 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 b268bbd2..f9680d80 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 5308c602..e2e2169f 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 3bd8776f..218e423c 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 dd6bc058..ad7e005b 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 8472fb12..e76fa5ed 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 b3d14725..5a85a3e2 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 544396c6..02385409 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 8c4f7da4..3ea4ba9a 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 1a16013a..479617be 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 e54bf920..8129ecb2 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 21fc6865..1b5dcfb1 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 b4d8c092..0511bd05 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 413fd461..27e3df1e 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 42165c57..3eeac394 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 551c1d1b..d3ed3a06 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 2a198fc5..ba18ae97 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 6044b137..1847abc5 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 649f48df..579c86eb 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 6c5130a3..8e3bf46c 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 a9b7455d..42379019 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 41d3d65d..5b7491e1 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. */ @@ -17,6 +24,7 @@ type CalloutVariants = | 'wip' | 'canary' | 'experimental' + | 'rc' | 'major' | 'rsc'; @@ -43,6 +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/ExpandableExample.tsx b/src/components/MDX/ExpandableExample.tsx index 1e709e48..c11cd6c3 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 a9f3efc3..5890a3a4 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 5759a7c0..17e4683b 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 0522df67..b0bee624 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 776a11c0..cd9f8881 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 7bf041e5..8a47c401 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 afcb9c26..a32dad27 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. */ @@ -99,6 +106,10 @@ const Canary = ({children}: {children: React.ReactNode}) => ( {children} ); +const RC = ({children}: {children: React.ReactNode}) => ( + {children} +); + const Experimental = ({children}: {children: React.ReactNode}) => ( {children} ); @@ -526,6 +537,7 @@ export const MDXComponents = { Math, MathI, Note, + RC, Canary, Experimental, ExperimentalBadge, diff --git a/src/components/MDX/PackageImport.tsx b/src/components/MDX/PackageImport.tsx index 5e2da820..222353ff 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 d91ed48b..29330436 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 868f9fb6..be7451ab 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 b5276fc1..3417e11f 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 7d6e566d..4a241c87 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 94cf13dd..b51627d8 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 7c67ee46..3dbeb113 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 de883629..1945f0c6 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 d115868d..3fe743a2 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 a27122ed..83b968fa 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 7284912e..ca028653 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 e4fe0afe..ead9341b 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 f828a6c2..71a25ea4 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 67f40d0b..48d8daee 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 3923470c..8aa34dc9 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 193b07be..049face9 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. */ @@ -9,6 +16,66 @@ export const AppJSPath = `/src/App.js`; export const StylesCSSPath = `/src/styles.css`; export const SUPPORTED_FILES = [AppJSPath, StylesCSSPath]; +/** + * Tokenize meta attributes while ignoring brace-wrapped metadata (e.g. {expectedErrors: …}). + */ +function splitMeta(meta: string): string[] { + const tokens: string[] = []; + let current = ''; + let depth = 0; + const trimmed = meta.trim(); + + for (let ii = 0; ii < trimmed.length; ii++) { + const char = trimmed[ii]; + + if (char === '{') { + if (depth === 0 && current) { + tokens.push(current); + current = ''; + } + depth += 1; + continue; + } + + if (char === '}') { + if (depth > 0) { + depth -= 1; + } + if (depth === 0) { + current = ''; + } + if (depth < 0) { + throw new Error(`Unexpected closing brace in meta: ${meta}`); + } + continue; + } + + if (depth > 0) { + continue; + } + + if (/\s/.test(char)) { + if (current) { + tokens.push(current); + current = ''; + } + continue; + } + + current += char; + } + + if (current) { + tokens.push(current); + } + + if (depth !== 0) { + throw new Error(`Unclosed brace in meta: ${meta}`); + } + + return tokens; +} + export const createFileMap = (codeSnippets: any) => { return codeSnippets.reduce( (result: Record, codeSnippet: React.ReactElement) => { @@ -30,12 +97,17 @@ export const createFileMap = (codeSnippets: any) => { let fileActive = false; // if the file tab is shown by default if (props.meta) { - const [name, ...params] = props.meta.split(' '); - filePath = '/' + name; - if (params.includes('hidden')) { + const tokens = splitMeta(props.meta); + const name = tokens.find( + (token) => token.includes('/') || token.includes('.') + ); + if (name) { + filePath = name.startsWith('/') ? name : `/${name}`; + } + if (tokens.includes('hidden')) { fileHidden = true; } - if (params.includes('active')) { + if (tokens.includes('active')) { fileActive = true; } } else { @@ -50,6 +122,18 @@ export const createFileMap = (codeSnippets: any) => { } } + if (!filePath) { + if (props.className === 'language-js') { + filePath = AppJSPath; + } else if (props.className === 'language-css') { + filePath = StylesCSSPath; + } else { + throw new Error( + `Code block is missing a filename: ${props.children}` + ); + } + } + if (result[filePath]) { throw new Error( `File ${filePath} was defined multiple times. Each file snippet should have a unique path name` diff --git a/src/components/MDX/Sandpack/index.tsx b/src/components/MDX/Sandpack/index.tsx index 6755ba8d..08e7dd6f 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 5fea2f11..667b22d7 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'; @@ -14,13 +21,6 @@ const getCodeMirrorPosition = ( const linter = new Linter(); -// HACK! Eslint requires 'esquery' using `require`, but there's no commonjs interop. -// because of this it tries to run `esquery.parse()`, while there's only `esquery.default.parse()`. -// This hack places the functions in the right place. -const esquery = require('esquery'); -esquery.parse = esquery.default?.parse; -esquery.matches = esquery.default?.matches; - const reactRules = require('eslint-plugin-react-hooks').rules; linter.defineRules({ 'react-hooks/rules-of-hooks': reactRules['rules-of-hooks'], diff --git a/src/components/MDX/Sandpack/template.ts b/src/components/MDX/Sandpack/template.ts index dd6fd12b..ed594887 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, @@ -28,8 +35,8 @@ root.render( eject: 'react-scripts eject', }, dependencies: { - react: '^19.1.0', - 'react-dom': '^19.1.0', + react: '^19.2.0', + 'react-dom': '^19.2.0', 'react-scripts': '^5.0.0', }, }, diff --git a/src/components/MDX/Sandpack/useSandpackLint.tsx b/src/components/MDX/Sandpack/useSandpackLint.tsx index ec05fbe0..479b53ee 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 51ce28dc..49e980d3 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'; @@ -49,8 +56,8 @@ export default function formatHTML(markup) { const packageJSON = ` { "dependencies": { - "react": "18.3.0-canary-6db7f4209-20231021", - "react-dom": "18.3.0-canary-6db7f4209-20231021", + "react": "^19.2.0", + "react-dom": "^19.2.0", "react-scripts": "^5.0.0", "html-format": "^1.1.2" }, diff --git a/src/components/MDX/SimpleCallout.tsx b/src/components/MDX/SimpleCallout.tsx index ae259bcf..0e124baa 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 2c2fffa7..2d0c6553 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 47529271..0fd0160d 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. */ @@ -72,13 +79,15 @@ function TerminalBlock({level = 'info', children}: TerminalBlockProps) { -
- - {message} -
+ + + {message} + + ); } diff --git a/src/components/MDX/TocContext.tsx b/src/components/MDX/TocContext.tsx index 8aeead37..924e6e09 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 d46a7027..20fc3b5f 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 409bd03b..85f095ff 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. */ @@ -12,7 +19,7 @@ import {IconExperimental} from './Icon/IconExperimental'; interface PageHeadingProps { title: string; - version?: 'experimental' | 'canary'; + version?: 'experimental' | 'canary' | 'rc'; experimental?: boolean; status?: string; description?: string; @@ -40,6 +47,12 @@ 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' && ( - - -React Conf 2024 is scheduled for May 15–16 in Henderson, Nevada! If you’re interested in attending React Conf in person, you can [sign up for the ticket lottery](https://forms.reform.app/bLaLeE/react-conf-2024-ticket-lottery/1aRQLK) until February 28th. - -For more info on tickets, free streaming, sponsoring, and more, see [the React Conf website](https://conf.react.dev). - - - --- ## React Compiler {/*react-compiler*/} diff --git a/src/content/blog/2024/05/22/react-conf-2024-recap.md b/src/content/blog/2024/05/22/react-conf-2024-recap.md index 7cb7d42e..e2246401 100644 --- a/src/content/blog/2024/05/22/react-conf-2024-recap.md +++ b/src/content/blog/2024/05/22/react-conf-2024-recap.md @@ -112,7 +112,7 @@ Thank you [Ricky Hanlon](https://www.youtube.com/watch?v=FxTZL2U-uKg&t=1263s) fo Thank you [Callstack](https://www.callstack.com/) for building the conference website; and to [Kadi Kraman](https://twitter.com/kadikraman) and the [Expo](https://expo.dev/) team for building the conference mobile app. -Thank you to all the sponsors who made the event possible: [Remix](https://remix.run/), [Amazon](https://developer.amazon.com/apps-and-games?cmp=US_2024_05_3P_React-Conf-2024&ch=prtnr&chlast=prtnr&pub=ref&publast=ref&type=org&typelast=org), [MUI](https://mui.com/), [Sentry](https://sentry.io/for/react/?utm_source=sponsored-conf&utm_medium=sponsored-event&utm_campaign=frontend-fy25q2-evergreen&utm_content=logo-reactconf2024-learnmore), [Abbott](https://www.jobs.abbott/software), [Expo](https://expo.dev/), [RedwoodJS](https://redwoodjs.com/), and [Vercel](https://vercel.com). +Thank you to all the sponsors who made the event possible: [Remix](https://remix.run/), [Amazon](https://developer.amazon.com/apps-and-games?cmp=US_2024_05_3P_React-Conf-2024&ch=prtnr&chlast=prtnr&pub=ref&publast=ref&type=org&typelast=org), [MUI](https://mui.com/), [Sentry](https://sentry.io/for/react/?utm_source=sponsored-conf&utm_medium=sponsored-event&utm_campaign=frontend-fy25q2-evergreen&utm_content=logo-reactconf2024-learnmore), [Abbott](https://www.jobs.abbott/software), [Expo](https://expo.dev/), [RedwoodJS](https://rwsdk.com/), and [Vercel](https://vercel.com). Thank you to the AV Team for the visuals, stage, and sound; and to the Westin Hotel for hosting us. diff --git a/src/content/blog/2024/10/21/react-compiler-beta-release.md b/src/content/blog/2024/10/21/react-compiler-beta-release.md index cd49b6eb..750c0f3b 100644 --- a/src/content/blog/2024/10/21/react-compiler-beta-release.md +++ b/src/content/blog/2024/10/21/react-compiler-beta-release.md @@ -12,9 +12,9 @@ October 21, 2024 by [Lauren Tan](https://twitter.com/potetotes). -### React Compiler is now in RC! {/*react-compiler-is-now-in-rc*/} +### React Compiler is now stable! {/*react-compiler-is-now-in-rc*/} -Please see the [RC blog post](/blog/2025/04/21/react-compiler-rc) for details. +Please see the [stable release blog post](/blog/2025/10/07/react-compiler-1) for details. diff --git a/src/content/blog/2024/12/05/react-19.md b/src/content/blog/2024/12/05/react-19.md index 65bf4275..4e9aad8e 100644 --- a/src/content/blog/2024/12/05/react-19.md +++ b/src/content/blog/2024/12/05/react-19.md @@ -355,7 +355,7 @@ For more information, see [React DOM Static APIs](/reference/react-dom/static). Server Components are a new option that allows rendering components ahead of time, before bundling, in an environment separate from your client application or SSR server. This separate environment is the "server" in React Server Components. Server Components can run once at build time on your CI server, or they can be run for each request using a web server. -React 19 includes all of the React Server Components features included from the Canary channel. This means libraries that ship with Server Components can now target React 19 as a peer dependency with a `react-server` [export condition](https://github.com/reactjs/rfcs/blob/main/text/0227-server-module-conventions.md#react-server-conditional-exports) for use in frameworks that support the [Full-stack React Architecture](/learn/start-a-new-react-project#which-features-make-up-the-react-teams-full-stack-architecture-vision). +React 19 includes all of the React Server Components features included from the Canary channel. This means libraries that ship with Server Components can now target React 19 as a peer dependency with a `react-server` [export condition](https://github.com/reactjs/rfcs/blob/main/text/0227-server-module-conventions.md#react-server-conditional-exports) for use in frameworks that support the [Full-stack React Architecture](/learn/creating-a-react-app#which-features-make-up-the-react-teams-full-stack-architecture-vision). diff --git a/src/content/blog/2025/02/14/sunsetting-create-react-app.md b/src/content/blog/2025/02/14/sunsetting-create-react-app.md index 9ced6231..6f3e95d8 100644 --- a/src/content/blog/2025/02/14/sunsetting-create-react-app.md +++ b/src/content/blog/2025/02/14/sunsetting-create-react-app.md @@ -177,7 +177,7 @@ export default function Dashboard() { } ``` -Fetching in an effect means the user has to wait longer to see the content, even though the data could have been fetched earlier. To solve this, you can use a data fetching library like [React Query](https://react-query.tanstack.com/), [SWR](https://swr.vercel.app/), [Apollo](https://www.apollographql.com/docs/react), or [Relay](https://relay.dev/) which provide options to prefetch data so the request is started before the component renders. +Fetching in an effect means the user has to wait longer to see the content, even though the data could have been fetched earlier. To solve this, you can use a data fetching library like [TanStack Query](https://tanstack.com/query/), [SWR](https://swr.vercel.app/), [Apollo](https://www.apollographql.com/docs/react), or [Relay](https://relay.dev/) which provide options to prefetch data so the request is started before the component renders. These libraries work best when integrated with your routing "loader" pattern to specify data dependencies at the route level, which allows the router to optimize your data fetches: diff --git a/src/content/blog/2025/04/21/react-compiler-rc.md b/src/content/blog/2025/04/21/react-compiler-rc.md deleted file mode 100644 index 2ebbf3ba..00000000 --- a/src/content/blog/2025/04/21/react-compiler-rc.md +++ /dev/null @@ -1,128 +0,0 @@ ---- -title: "React Compiler RC" -author: Lauren Tan and Mofei Zhang -date: 2025/04/21 -description: We are releasing the compiler's first Release Candidate (RC) today. - ---- - -April 21, 2025 by [Lauren Tan](https://x.com/potetotes) and [Mofei Zhang](https://x.com/zmofei). - ---- - - - -The React team is excited to share new updates: - - - -1. We're publishing React Compiler RC today, in preparation of the compiler's stable release. -2. We're merging `eslint-plugin-react-compiler` into `eslint-plugin-react-hooks`. -3. We've added support for swc and are working with oxc to support Babel-free builds. - ---- - -[React Compiler](https://react.dev/learn/react-compiler) is a build-time tool that optimizes your React app through automatic memoization. Last year, we published React Compiler’s [first beta](https://react.dev/blog/2024/10/21/react-compiler-beta-release) and received lots of great feedback and contributions. We’re excited about the wins we’ve seen from folks adopting the compiler (see case studies from [Sanity Studio](https://github.com/reactwg/react-compiler/discussions/33) and [Wakelet](https://github.com/reactwg/react-compiler/discussions/52)) and are working towards a stable release. - -We are releasing the compiler's first Release Candidate (RC) today. The RC is intended to be a stable and near-final version of the compiler, and safe to try out in production. - -## Use React Compiler RC today {/*use-react-compiler-rc-today*/} -To install the RC: - -npm - -{`npm install --save-dev --save-exact babel-plugin-react-compiler@rc`} - - -pnpm - -{`pnpm add --save-dev --save-exact babel-plugin-react-compiler@rc`} - - -yarn - -{`yarn add --dev --exact babel-plugin-react-compiler@rc`} - - -As part of the RC, we've been making React Compiler easier to add to your projects and added optimizations to how the compiler generates memoization. React Complier now supports optional chains and array indices as dependencies. We're exploring how to infer even more dependencies like equality checks and string interpolation. These improvements ultimately result in fewer re-renders and more responsive UIs. - -We have also heard from the community that the ref-in-render validation sometimes has false positives. Since as a general philosophy we want you to be able to fully trust in the compiler's error messages and hints, we are turning it off by default for now. We will keep working to improve this validation, and we will re-enable it in a follow up release. - -You can find more details on using the Compiler in [our docs](https://react.dev/learn/react-compiler). - -## Feedback {/*feedback*/} -During the RC period, we encourage all React users to try the compiler and provide feedback in the React repo. Please [open an issue](https://github.com/facebook/react/issues) if you encounter any bugs or unexpected behavior. If you have a general question or suggestion, please post them in the [React Compiler Working Group](https://github.com/reactwg/react-compiler/discussions). - -## Backwards Compatibility {/*backwards-compatibility*/} -As noted in the Beta announcement, React Compiler is compatible with React 17 and up. If you are not yet on React 19, you can use React Compiler by specifying a minimum target in your compiler config, and adding `react-compiler-runtime` as a dependency. You can find docs on this [here](https://react.dev/learn/react-compiler#using-react-compiler-with-react-17-or-18). - -## Migrating from eslint-plugin-react-compiler to eslint-plugin-react-hooks {/*migrating-from-eslint-plugin-react-compiler-to-eslint-plugin-react-hooks*/} -If you have already installed eslint-plugin-react-compiler, you can now remove it and use `eslint-plugin-react-hooks@rc`. Many thanks to [@michaelfaith](https://bsky.app/profile/michael.faith) for contributing to this improvement! - -To install: - -npm - -{`npm install --save-dev eslint-plugin-react-hooks@rc`} - - -pnpm - -{`pnpm add --save-dev eslint-plugin-react-hooks@rc`} - - -yarn - -{`yarn add --dev eslint-plugin-react-hooks@rc`} - - -```js -// eslint.config.js -import * as reactHooks from 'eslint-plugin-react-hooks'; - -export default [ - // Flat Config (eslint 9+) - reactHooks.configs.recommended, - - // Legacy Config - reactHooks.configs['recommended-latest'] -]; -``` - -To enable the React Compiler rule, add `'react-hooks/react-compiler': 'error'` to your ESLint configuration. - -The linter does not require the compiler to be installed, so there's no risk in upgrading eslint-plugin-react-hooks. We recommend everyone upgrade today. - -## swc support (experimental) {/*swc-support-experimental*/} -React Compiler can be installed across [several build tools](/learn/react-compiler#installation) such as Babel, Vite, and Rsbuild. - -In addition to those tools, we have been collaborating with Kang Dongyoon ([@kdy1dev](https://x.com/kdy1dev)) from the [swc](https://swc.rs/) team on adding additional support for React Compiler as an swc plugin. While this work isn't done, Next.js build performance should now be considerably faster when the [React Compiler is enabled in your Next.js app](https://nextjs.org/docs/app/api-reference/config/next-config-js/reactCompiler). - -We recommend using Next.js [15.3.1](https://github.com/vercel/next.js/releases/tag/v15.3.1) or greater to get the best build performance. - -Vite users can continue to use [vite-plugin-react](https://github.com/vitejs/vite-plugin-react) to enable the compiler, by adding it as a [Babel plugin](https://react.dev/learn/react-compiler#usage-with-vite). We are also working with the [oxc](https://oxc.rs/) team to [add support for the compiler](https://github.com/oxc-project/oxc/issues/10048). Once [rolldown](https://github.com/rolldown/rolldown) is officially released and supported in Vite and oxc support is added for React Compiler, we'll update the docs with information on how to migrate. - -## Upgrading React Compiler {/*upgrading-react-compiler*/} -React Compiler works best when the auto-memoization applied is strictly for performance. Future versions of the compiler may change how memoization is applied, for example it could become more granular and precise. - -However, because product code may sometimes break the [rules of React](https://react.dev/reference/rules) in ways that aren't always statically detectable in JavaScript, changing memoization can occasionally have unexpected results. For example, a previously memoized value might be used as a dependency for a useEffect somewhere in the component tree. Changing how or whether this value is memoized can cause over or under-firing of that useEffect. While we encourage [useEffect only for synchronization](https://react.dev/learn/synchronizing-with-effects), your codebase may have useEffects that cover other use-cases such as effects that needs to only run in response to specific values changing. - -In other words, changing memoization may under rare circumstances cause unexpected behavior. For this reason, we recommend following the Rules of React and employing continuous end-to-end testing of your app so you can upgrade the compiler with confidence and identify any rules of React violations that might cause issues. - -If you don't have good test coverage, we recommend pinning the compiler to an exact version (eg `19.1.0`) rather than a SemVer range (eg `^19.1.0`). You can do this by passing the `--save-exact` (npm/pnpm) or `--exact` flags (yarn) when upgrading the compiler. You should then do any upgrades of the compiler manually, taking care to check that your app still works as expected. - -## Roadmap to Stable {/*roadmap-to-stable*/} -*This is not a final roadmap, and is subject to change.* - -After a period of final feedback from the community on the RC, we plan on a Stable Release for the compiler. - -* ✅ Experimental: Released at React Conf 2024, primarily for feedback from application developers. -* ✅ Public Beta: Available today, for feedback from library authors. -* ✅ Release Candidate (RC): React Compiler works for the majority of rule-following apps and libraries without issue. -* General Availability: After final feedback period from the community. - -Post-Stable, we plan to add more compiler optimizations and improvements. This includes both continual improvements to automatic memoization, and new optimizations altogether, with minimal to no change of product code. Each upgrade will continue to improve performance and add better handling of diverse JavaScript and React patterns. - ---- - -Thanks to [Joe Savona](https://x.com/en_JS), [Jason Bonta](https://x.com/someextent), [Jimmy Lai](https://x.com/feedthejim), and [Kang Dongyoon](https://x.com/kdy1dev) (@kdy1dev) for reviewing and editing this post. 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 18e6bec5..7cd819b1 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 @@ -16,16 +16,6 @@ In React Labs posts, we write about projects in active research and development. - - -React Conf 2025 is scheduled for October 7–8 in Henderson, Nevada! - -We're looking for speakers to help us create talks about the features covered in this post. If you're interested in speaking at ReactConf, [please apply here](https://forms.reform.app/react-conf/call-for-speakers/) (no talk proposal required). - -For more info on tickets, free streaming, sponsoring, and more, see [the React Conf website](https://conf.react.dev). - - - Today, we're excited to release documentation for two new experimental features that are ready for testing: - [View Transitions](#view-transitions) @@ -42,6 +32,14 @@ We're also sharing updates on new features currently in development: # New Experimental Features {/*new-experimental-features*/} + + +`` has shipped in `react@19.2`. + +`` and `addTransitionType` are now available in `react@canary`. + + + View Transitions and Activity are now ready for testing in `react@experimental`. These features have been tested in production and are stable, but the final API may still change as we incorporate feedback. You can try them by upgrading React packages to the most recent experimental version: @@ -68,7 +66,7 @@ To opt-in to animating an element, wrap it in the new `` compone ``` -This new component lets you declaratively define "what" to animate when an animation is activated. +This new component lets you declaratively define "what" to animate when an animation is activated. You can define "when" to animate by using one of these three triggers for a View Transition: @@ -101,9 +99,9 @@ By default, these animations use the [default CSS animations for View Transition When the DOM updates due to an animation trigger—like `startTransition`, `useDeferredValue`, or a `Suspense` fallback switching to content—React will use [declarative heuristics](/reference/react/ViewTransition#viewtransition) to automatically determine which `` components to activate for the animation. The browser will then run the animation that's defined in CSS. -If you're familiar with the browser's View Transition API and want to know how React supports it, check out [How does `` Work](/reference/react/ViewTransition#how-does-viewtransition-work) in the docs. +If you're familiar with the browser's View Transition API and want to know how React supports it, check out [How does `` Work](/reference/react/ViewTransition#how-does-viewtransition-work) in the docs. -In this post, let's take a look at a few examples of how to use View Transitions. +In this post, let's take a look at a few examples of how to use View Transitions. We'll start with this app, which doesn't animate any of the following interactions: - Click a video to view the details. @@ -1247,8 +1245,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -1296,16 +1294,17 @@ function navigate(url) { When the `url` changes, the `` and new route are rendered. Since the `` was updated inside of `startTransition`, the `` is activated for an animation. -By default, View Transitions include the browser default cross-fade animation. Adding this to our example, we now have a cross-fade whenever we navigate between pages: +By default, View Transitions include the browser default cross-fade animation. Adding this to our example, we now have a cross-fade whenever we navigate between pages: ```js src/App.js active -import {unstable_ViewTransition as ViewTransition} from 'react'; import Details from './Details'; import Home from './Home'; import {useRouter} from './router'; +import {ViewTransition} from 'react'; import Details from './Details'; +import Home from './Home'; import {useRouter} from './router'; export default function App() { const {url} = useRouter(); - + // Use ViewTransition to animate between pages. // No additional CSS needed by default. return ( @@ -1564,11 +1563,11 @@ export function IconSearch(props) { ``` ```js src/Layout.js -import {unstable_ViewTransition as ViewTransition} from 'react'; import { useIsNavPending } from "./router"; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { const isPending = useIsNavPending(); - + return (
@@ -1772,22 +1771,22 @@ import {useState, createContext,use,useTransition,useLayoutEffect,useEffect} fro export function Router({ children }) { const [isPending, startTransition] = useTransition(); - + function navigate(url) { // Update router state in transition. startTransition(() => { go(url); }); } - - - - + + + + const [routerState, setRouterState] = useState({ pendingNav: () => {}, url: document.location.pathname, }); - + function go(url) { setRouterState({ @@ -1797,7 +1796,7 @@ export function Router({ children }) { }, }); } - + function navigateBack(url) { startTransition(() => { @@ -2443,8 +2442,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -2458,7 +2457,7 @@ root.render( -Since our router already updates the route using `startTransition`, this one line change to add `` activates with the default cross-fade animation. +Since our router already updates the route using `startTransition`, this one line change to add `` activates with the default cross-fade animation. If you're curious how this works, see the docs for [How does `` work?](/reference/react/ViewTransition#how-does-viewtransition-work) @@ -2466,7 +2465,7 @@ If you're curious how this works, see the docs for [How does `` #### Opting out of `` animations {/*opting-out-of-viewtransition-animations*/} -In this example, we're wrapping the root of the app in `` for simplicity, but this means that all transitions in the app will be animated, which can lead to unexpected animations. +In this example, we're wrapping the root of the app in `` for simplicity, but this means that all transitions in the app will be animated, which can lead to unexpected animations. To fix, we're wrapping route children with `"none"` so each page can control its own animation: @@ -2477,7 +2476,7 @@ To fix, we're wrapping route children with `"none"` so each page can control its ``` -In practice, navigations should be done via "enter" and "exit" props, or by using Transition Types. +In practice, navigations should be done via "enter" and "exit" props, or by using Transition Types. @@ -2512,7 +2511,7 @@ Now, the cross fade is slower: ```js src/App.js active -import { unstable_ViewTransition as ViewTransition } from "react"; +import { ViewTransition } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; @@ -2778,7 +2777,7 @@ export function IconSearch(props) { ``` ```js src/Layout.js hidden -import {unstable_ViewTransition as ViewTransition} from 'react'; import { useIsNavPending } from "./router"; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { const isPending = useIsNavPending(); @@ -3671,8 +3670,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -3705,7 +3704,7 @@ Now the video thumbnail animates between the two pages: ```js src/App.js -import { unstable_ViewTransition as ViewTransition } from "react"; +import { ViewTransition } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; @@ -3972,7 +3971,7 @@ export function IconSearch(props) { ``` ```js src/Layout.js hidden -import {unstable_ViewTransition as ViewTransition} from 'react'; import { useIsNavPending } from "./router"; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { const isPending = useIsNavPending(); @@ -4029,7 +4028,7 @@ export default function LikeButton({video}) { ``` ```js src/Videos.js active -import { useState, unstable_ViewTransition as ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; import { startTransition } from "react"; +import { useState, ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; import { startTransition } from "react"; export function Thumbnail({ video, children }) { // Add a name to animate with a shared element transition. @@ -4880,8 +4879,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -4962,7 +4961,7 @@ Now we can animate the header along with thumbnail based on navigation type: ```js src/App.js hidden -import { unstable_ViewTransition as ViewTransition } from "react"; +import { ViewTransition } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; @@ -5227,7 +5226,7 @@ export function IconSearch(props) { ``` ```js src/Layout.js active -import {unstable_ViewTransition as ViewTransition} from 'react'; import { useIsNavPending } from "./router"; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { const isPending = useIsNavPending(); @@ -5291,7 +5290,7 @@ export default function LikeButton({video}) { ``` ```js src/Videos.js hidden -import { useState, unstable_ViewTransition as ViewTransition } from "react"; +import { useState, ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; @@ -5442,11 +5441,11 @@ export function fetchVideoDetails(id) { ``` ```js src/router.js -import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, unstable_addTransitionType as addTransitionType} from "react"; +import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, addTransitionType} from "react"; export function Router({ children }) { const [isPending, startTransition] = useTransition(); - + function navigate(url) { startTransition(() => { // Transition type for the cause "nav forward" @@ -5473,7 +5472,7 @@ export function Router({ children }) { }, }); } - + useEffect(() => { function handlePopState() { // This should not animate because restoration has to be synchronous. @@ -6196,8 +6195,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -6213,7 +6212,7 @@ root.render( ### Animating Suspense Boundaries {/*animating-suspense-boundaries*/} -Suspense will also activate View Transitions. +Suspense will also activate View Transitions. To animate the fallback to content, we can wrap `Suspense` with ``: @@ -6230,7 +6229,7 @@ By adding this, the fallback will cross-fade into the content. Click a video and ```js src/App.js hidden -import { unstable_ViewTransition as ViewTransition } from "react"; +import { ViewTransition } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; @@ -6248,7 +6247,7 @@ export default function App() { ``` ```js src/Details.js active -import { use, Suspense, unstable_ViewTransition as ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; import Layout from "./Layout"; import { ChevronLeft } from "./Icons"; +import { use, Suspense, ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; import Layout from "./Layout"; import { ChevronLeft } from "./Icons"; function VideoDetails({ id }) { // Cross-fade the fallback to content. @@ -6498,7 +6497,7 @@ export function IconSearch(props) { ``` ```js src/Layout.js hidden -import {unstable_ViewTransition as ViewTransition} from 'react'; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { @@ -6563,7 +6562,7 @@ export default function LikeButton({video}) { ``` ```js src/Videos.js hidden -import { useState, unstable_ViewTransition as ViewTransition } from "react"; +import { useState, ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; @@ -6714,7 +6713,7 @@ export function fetchVideoDetails(id) { ``` ```js src/router.js hidden -import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, unstable_addTransitionType as addTransitionType} from "react"; +import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, addTransitionType} from "react"; export function Router({ children }) { const [isPending, startTransition] = useTransition(); @@ -6742,7 +6741,7 @@ export function Router({ children }) { }, }); } - + useEffect(() => { function handlePopState() { // This should not animate because restoration has to be synchronous. @@ -7494,8 +7493,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -7528,7 +7527,7 @@ We can also provide custom animations using an `exit` on the fallback, and `ente Here's how we'll define `slide-down` and `slide-up` with CSS: ```css {1, 6} -::view-transition-old(.slide-down) { +::view-transition-old(.slide-down) { /* Slide the fallback down */ animation: ...; } @@ -7544,7 +7543,7 @@ Now, the Suspense content replaces the fallback with a sliding animation: ```js src/App.js hidden -import { unstable_ViewTransition as ViewTransition } from "react"; +import { ViewTransition } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; @@ -7562,7 +7561,7 @@ export default function App() { ``` ```js src/Details.js active -import { use, Suspense, unstable_ViewTransition as ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; import Layout from "./Layout"; import { ChevronLeft } from "./Icons"; +import { use, Suspense, ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; import Layout from "./Layout"; import { ChevronLeft } from "./Icons"; function VideoDetails({ id }) { return ( @@ -7819,7 +7818,7 @@ export function IconSearch(props) { ``` ```js src/Layout.js hidden -import {unstable_ViewTransition as ViewTransition} from 'react'; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { @@ -7884,7 +7883,7 @@ export default function LikeButton({video}) { ``` ```js src/Videos.js hidden -import { useState, unstable_ViewTransition as ViewTransition } from "react"; +import { useState, ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; @@ -8035,7 +8034,7 @@ export function fetchVideoDetails(id) { ``` ```js src/router.js hidden -import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, unstable_addTransitionType as addTransitionType} from "react"; +import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, addTransitionType} from "react"; export function Router({ children }) { const [isPending, startTransition] = useTransition(); @@ -8063,7 +8062,7 @@ export function Router({ children }) { }, }); } - + useEffect(() => { function handlePopState() { // This should not animate because restoration has to be synchronous. @@ -8815,8 +8814,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -8858,7 +8857,7 @@ Now the items animate as you type in the search bar: ```js src/App.js hidden -import { unstable_ViewTransition as ViewTransition } from "react"; +import { ViewTransition } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; @@ -8876,7 +8875,7 @@ export default function App() { ``` ```js src/Details.js hidden -import { use, Suspense, unstable_ViewTransition as ViewTransition } from "react"; +import { use, Suspense, ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; @@ -8951,17 +8950,17 @@ function VideoInfo({ id }) { ``` ```js src/Home.js -import { useId, useState, use, useDeferredValue, unstable_ViewTransition as ViewTransition } from "react";import { Video } from "./Videos";import Layout from "./Layout";import { fetchVideos } from "./data";import { IconSearch } from "./Icons"; +import { useId, useState, use, useDeferredValue, ViewTransition } from "react";import { Video } from "./Videos";import Layout from "./Layout";import { fetchVideos } from "./data";import { IconSearch } from "./Icons"; function SearchList({searchText, videos}) { - // Activate with useDeferredValue ("when") + // Activate with useDeferredValue ("when") const deferredSearchText = useDeferredValue(searchText); const filteredVideos = filterVideos(videos, deferredSearchText); return (
{filteredVideos.map((video) => ( - // Animate each item in list ("what") + // Animate each item in list ("what") @@ -8978,7 +8977,7 @@ export default function Home() { const videos = use(fetchVideos()); const count = videos.length; const [searchText, setSearchText] = useState(''); - + return ( {count} Videos
}> @@ -9146,7 +9145,7 @@ export function IconSearch(props) { ``` ```js src/Layout.js hidden -import {unstable_ViewTransition as ViewTransition} from 'react'; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { @@ -9211,7 +9210,7 @@ export default function LikeButton({video}) { ``` ```js src/Videos.js hidden -import { useState, unstable_ViewTransition as ViewTransition } from "react"; +import { useState, ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; @@ -9362,7 +9361,7 @@ export function fetchVideoDetails(id) { ``` ```js src/router.js hidden -import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, unstable_addTransitionType as addTransitionType} from "react"; +import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, addTransitionType} from "react"; export function Router({ children }) { const [isPending, startTransition] = useTransition(); @@ -9390,7 +9389,7 @@ export function Router({ children }) { }, }); } - + useEffect(() => { function handlePopState() { // This should not animate because restoration has to be synchronous. @@ -10156,8 +10155,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -10182,7 +10181,7 @@ Let's remove the slow fade, and take a look at the final result: ```js src/App.js -import {unstable_ViewTransition as ViewTransition} from 'react'; import Details from './Details'; import Home from './Home'; import {useRouter} from './router'; +import {ViewTransition} from 'react'; import Details from './Details'; import Home from './Home'; import {useRouter} from './router'; export default function App() { const {url} = useRouter(); @@ -10197,7 +10196,7 @@ export default function App() { ``` ```js src/Details.js -import { use, Suspense, unstable_ViewTransition as ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; import Layout from "./Layout"; import { ChevronLeft } from "./Icons"; +import { use, Suspense, ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; import Layout from "./Layout"; import { ChevronLeft } from "./Icons"; function VideoDetails({id}) { // Animate from Suspense fallback to content @@ -10267,17 +10266,17 @@ function VideoInfo({ id }) { ``` ```js src/Home.js -import { useId, useState, use, useDeferredValue, unstable_ViewTransition as ViewTransition } from "react";import { Video } from "./Videos";import Layout from "./Layout";import { fetchVideos } from "./data";import { IconSearch } from "./Icons"; +import { useId, useState, use, useDeferredValue, ViewTransition } from "react";import { Video } from "./Videos";import Layout from "./Layout";import { fetchVideos } from "./data";import { IconSearch } from "./Icons"; function SearchList({searchText, videos}) { - // Activate with useDeferredValue ("when") + // Activate with useDeferredValue ("when") const deferredSearchText = useDeferredValue(searchText); const filteredVideos = filterVideos(videos, deferredSearchText); return (
{filteredVideos.map((video) => ( - // Animate each item in list ("what") + // Animate each item in list ("what") @@ -10294,7 +10293,7 @@ export default function Home() { const videos = use(fetchVideos()); const count = videos.length; const [searchText, setSearchText] = useState(''); - + return ( {count} Videos
}> @@ -10462,7 +10461,7 @@ export function IconSearch(props) { ``` ```js src/Layout.js -import {unstable_ViewTransition as ViewTransition} from 'react'; import { useIsNavPending } from "./router"; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { const isPending = useIsNavPending(); @@ -10526,7 +10525,7 @@ export default function LikeButton({video}) { ``` ```js src/Videos.js -import { useState, unstable_ViewTransition as ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; import { startTransition } from "react"; +import { useState, ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; import { startTransition } from "react"; export function Thumbnail({ video, children }) { // Add a name to animate with a shared element transition. @@ -10674,7 +10673,7 @@ export function fetchVideoDetails(id) { ``` ```js src/router.js -import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, unstable_addTransitionType as addTransitionType} from "react"; +import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, addTransitionType} from "react"; export function Router({ children }) { const [isPending, startTransition] = useTransition(); @@ -10694,7 +10693,7 @@ export function Router({ children }) { } const [routerState, setRouterState] = useState({pendingNav: () => {}, url: document.location.pathname}); - + function go(url) { setRouterState({ url, @@ -10703,7 +10702,7 @@ export function Router({ children }) { }, }); } - + useEffect(() => { function handlePopState() { // This should not animate because restoration has to be synchronous. @@ -11442,8 +11441,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -11508,7 +11507,7 @@ When a user navigates away from a page, it's common to stop rendering the old pa ```js {6,7} function App() { const { url } = useRouter(); - + return ( <> {url === '/' && } @@ -11525,7 +11524,7 @@ Activity allows you to keep the state around as the user changes pages, so when ```js {6-8} function App() { const { url } = useRouter(); - + return ( <> @@ -11544,11 +11543,11 @@ Try searching for a video, selecting it, and clicking "back": ```js src/App.js -import { unstable_ViewTransition as ViewTransition, unstable_Activity as Activity } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; +import { Activity, ViewTransition } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; export default function App() { const { url } = useRouter(); - + return ( // View Transitions know about Activity @@ -11563,7 +11562,7 @@ export default function App() { ``` ```js src/Details.js hidden -import { use, Suspense, unstable_ViewTransition as ViewTransition } from "react"; +import { use, Suspense, ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; @@ -11638,10 +11637,10 @@ function VideoInfo({ id }) { ``` ```js src/Home.js hidden -import { useId, useState, use, useDeferredValue, unstable_ViewTransition as ViewTransition } from "react";import { Video } from "./Videos";import Layout from "./Layout";import { fetchVideos } from "./data";import { IconSearch } from "./Icons"; +import { useId, useState, use, useDeferredValue, ViewTransition } from "react";import { Video } from "./Videos";import Layout from "./Layout";import { fetchVideos } from "./data";import { IconSearch } from "./Icons"; function SearchList({searchText, videos}) { - // Activate with useDeferredValue ("when") + // Activate with useDeferredValue ("when") const deferredSearchText = useDeferredValue(searchText); const filteredVideos = filterVideos(videos, deferredSearchText); return ( @@ -11651,7 +11650,7 @@ function SearchList({searchText, videos}) { )}
{filteredVideos.map((video) => ( - // Animate each item in list ("what") + // Animate each item in list ("what") @@ -11665,7 +11664,7 @@ export default function Home() { const videos = use(fetchVideos()); const count = videos.length; const [searchText, setSearchText] = useState(''); - + return ( {count} Videos
}> @@ -11833,7 +11832,7 @@ export function IconSearch(props) { ``` ```js src/Layout.js hidden -import {unstable_ViewTransition as ViewTransition} from 'react'; import { useIsNavPending } from "./router"; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { const isPending = useIsNavPending(); @@ -11897,7 +11896,7 @@ export default function LikeButton({video}) { ``` ```js src/Videos.js hidden -import { useState, unstable_ViewTransition as ViewTransition } from "react"; +import { useState, ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; @@ -12048,7 +12047,7 @@ export function fetchVideoDetails(id) { ``` ```js src/router.js hidden -import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, unstable_addTransitionType as addTransitionType} from "react"; +import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, addTransitionType} from "react"; export function Router({ children }) { const [isPending, startTransition] = useTransition(); @@ -12076,7 +12075,7 @@ export function Router({ children }) { }, }); } - + useEffect(() => { function handlePopState() { // This should not animate because restoration has to be synchronous. @@ -12841,8 +12840,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -12881,13 +12880,13 @@ With this update, if the content on the next page has time to pre-render, it wil ```js src/App.js -import { unstable_ViewTransition as ViewTransition, unstable_Activity as Activity, use } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; import {fetchVideos} from './data' +import { Activity, ViewTransition, use } from "react"; import Details from "./Details"; import Home from "./Home"; import { useRouter } from "./router"; import {fetchVideos} from './data'; export default function App() { const { url } = useRouter(); const videoId = url.split("/").pop(); const videos = use(fetchVideos()); - + return ( {/* Render videos in Activity to pre-render them */} @@ -12905,7 +12904,7 @@ export default function App() { ``` ```js src/Details.js -import { use, Suspense, unstable_ViewTransition as ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; import Layout from "./Layout"; import { ChevronLeft } from "./Icons"; +import { use, Suspense, ViewTransition } from "react"; import { fetchVideo, fetchVideoDetails } from "./data"; import { Thumbnail, VideoControls } from "./Videos"; import { useRouter } from "./router"; import Layout from "./Layout"; import { ChevronLeft } from "./Icons"; function VideoDetails({id}) { // Animate from Suspense fallback to content. @@ -12976,10 +12975,10 @@ function VideoInfo({ id }) { ``` ```js src/Home.js hidden -import { useId, useState, use, useDeferredValue, unstable_ViewTransition as ViewTransition } from "react";import { Video } from "./Videos";import Layout from "./Layout";import { fetchVideos } from "./data";import { IconSearch } from "./Icons"; +import { useId, useState, use, useDeferredValue, ViewTransition } from "react";import { Video } from "./Videos";import Layout from "./Layout";import { fetchVideos } from "./data";import { IconSearch } from "./Icons"; function SearchList({searchText, videos}) { - // Activate with useDeferredValue ("when") + // Activate with useDeferredValue ("when") const deferredSearchText = useDeferredValue(searchText); const filteredVideos = filterVideos(videos, deferredSearchText); return ( @@ -12989,7 +12988,7 @@ function SearchList({searchText, videos}) { )}
{filteredVideos.map((video) => ( - // Animate each item in list ("what") + // Animate each item in list ("what") @@ -13003,7 +13002,7 @@ export default function Home() { const videos = use(fetchVideos()); const count = videos.length; const [searchText, setSearchText] = useState(''); - + return ( {count} Videos
}> @@ -13171,7 +13170,7 @@ export function IconSearch(props) { ``` ```js src/Layout.js hidden -import {unstable_ViewTransition as ViewTransition} from 'react'; import { useIsNavPending } from "./router"; +import {ViewTransition} from 'react'; import { useIsNavPending } from "./router"; export default function Page({ heading, children }) { const isPending = useIsNavPending(); @@ -13235,7 +13234,7 @@ export default function LikeButton({video}) { ``` ```js src/Videos.js hidden -import { useState, unstable_ViewTransition as ViewTransition } from "react"; +import { useState, ViewTransition } from "react"; import LikeButton from "./LikeButton"; import { useRouter } from "./router"; import { PauseIcon, PlayIcon } from "./Icons"; @@ -13386,7 +13385,7 @@ export function fetchVideoDetails(id) { ``` ```js src/router.js hidden -import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, unstable_addTransitionType as addTransitionType} from "react"; +import {useState, createContext, use, useTransition, useLayoutEffect, useEffect, addTransitionType} from "react"; export function Router({ children }) { const [isPending, startTransition] = useTransition(); @@ -13414,7 +13413,7 @@ export function Router({ children }) { }, }); } - + useEffect(() => { function handlePopState() { // This should not animate because restoration has to be synchronous. @@ -14179,8 +14178,8 @@ root.render( ```json package.json hidden { "dependencies": { - "react": "experimental", - "react-dom": "experimental", + "react": "canary", + "react-dom": "canary", "react-scripts": "latest" }, "scripts": { @@ -14220,13 +14219,13 @@ These are areas we're still exploring, and we'll share more as we make progress. # Features in development {/*features-in-development*/} -We're also developing features to help solve the common problems below. +We're also developing features to help solve the common problems below. -As we iterate on possible solutions, you may see some potential APIs we're testing being shared based on the PRs we are landing. Please keep in mind that as we try different ideas, we often change or remove different solutions after trying them out. +As we iterate on possible solutions, you may see some potential APIs we're testing being shared based on the PRs we are landing. Please keep in mind that as we try different ideas, we often change or remove different solutions after trying them out. -When the solutions we're working on are shared too early, it can create churn and confusion in the community. To balance being transparent and limiting confusion, we're sharing the problems we're currently developing solutions for, without sharing a particular solution we have in mind. +When the solutions we're working on are shared too early, it can create churn and confusion in the community. To balance being transparent and limiting confusion, we're sharing the problems we're currently developing solutions for, without sharing a particular solution we have in mind. -As these features progress, we'll announce them on the blog with docs included so you can try them out. +As these features progress, we'll announce them on the blog with docs included so you can try them out. ## React Performance Tracks {/*react-performance-tracks*/} @@ -14259,7 +14258,7 @@ When we released hooks, we had three motivations: - **Think in terms of function, not lifecycles**: hooks let you split one component into smaller functions based on what pieces are related (such as setting up a subscription or fetching data), rather than forcing a split based on lifecycle methods. - **Support ahead-of-time compilation**: hooks were designed to support ahead-of-time compilation with less pitfalls causing unintentional de-optimizations caused by lifecycle methods, and limitations of classes. -Since their release, hooks have been successful at *sharing code between components*. Hooks are now the favored way to share logic between components, and there are less use cases for render props and higher order components. Hooks have also been successful at supporting features like Fast Refresh that were not possible with class components. +Since their release, hooks have been successful at *sharing code between components*. Hooks are now the favored way to share logic between components, and there are less use cases for render props and higher order components. Hooks have also been successful at supporting features like Fast Refresh that were not possible with class components. ### Effects can be hard {/*effects-can-be-hard*/} @@ -14300,18 +14299,18 @@ useEffect(() => { return () => { connection.disconnect(); }; -}); // compiler inserted dependencies. +}); // 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. +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. --- ## Compiler IDE Extension {/*compiler-ide-extension*/} -Earlier this week [we shared](/blog/2025/04/21/react-compiler-rc) the React Compiler release candidate, and we're working towards shipping the first SemVer stable version of the compiler in the coming months. +Later in 2025 [we shared](/blog/2025/10/07/react-compiler-1) the first stable release of React Compiler, and we're continuing to invest in shipping more improvements. We've also begun exploring ways to use the React Compiler to provide information that can improve understanding and debugging your code. One idea we've started exploring is a new experimental LSP-based React IDE extension powered by React Compiler, similar to the extension used in [Lauren Tan's React Conf talk](https://conf2024.react.dev/talks/5). @@ -14333,7 +14332,7 @@ Fragment refs are still being researched. We'll share more when we're closer to ## Gesture Animations {/*gesture-animations*/} -We're also researching ways to enhance View Transitions to support gesture animations such as swiping to open a menu, or scroll through a photo carousel. +We're also researching ways to enhance View Transitions to support gesture animations such as swiping to open a menu, or scroll through a photo carousel. Gestures present new challenges for a few reasons: @@ -14357,9 +14356,9 @@ Now that React 19 has shipped, we're revisiting this problem space to create a p const value = use(store); ``` -Our goal is to allow external state to be read during render without tearing, and to work seamlessly with all of the concurrent features React offers. +Our goal is to allow external state to be read during render without tearing, and to work seamlessly with all of the concurrent features React offers. -This research is still early. We'll share more, and what the new APIs will look like, when we're further along. +This research is still early. We'll share more, and what the new APIs will look like, when we're further along. --- diff --git a/src/content/blog/2025/10/01/react-19-2.md b/src/content/blog/2025/10/01/react-19-2.md new file mode 100644 index 00000000..51c30f70 --- /dev/null +++ b/src/content/blog/2025/10/01/react-19-2.md @@ -0,0 +1,339 @@ +--- +title: "React 19.2" +author: The React Team +date: 2025/10/01 +description: React 19.2 adds new features like Activity, React Performance Tracks, useEffectEvent, and more. +--- + +October 1, 2025 by [The React Team](/community/team) + +--- + + + +React 19.2 is now available on npm! + + + +This is our third release in the last year, following React 19 in December and React 19.1 in June. In this post, we'll give an overview of the new features in React 19.2, and highlight some notable changes. + + + +--- + +## New React Features {/*new-react-features*/} + +### `` {/*activity*/} + +`` lets you break your app into "activities" that can be controlled and prioritized. + +You can use Activity as an alternative to conditionally rendering parts of your app: + +```js +// Before +{isVisible && } + +// After + + + +``` + +In React 19.2, Activity supports two modes: `visible` and `hidden`. + +- `hidden`: hides the children, unmounts effects, and defers all updates until React has nothing left to work on. +- `visible`: shows the children, mounts effects, and allows updates to be processed normally. + +This means you can pre-render and keep rendering hidden parts of the app without impacting the performance of anything visible on screen. + +You can use Activity to render hidden parts of the app that a user is likely to navigate to next, or to save the state of parts the user navigates away from. This helps make navigations quicker by loading data, css, and images in the background, and allows back navigations to maintain state such as input fields. + +In the future, we plan to add more modes to Activity for different use cases. + +For examples on how to use Activity, check out the [Activity docs](/reference/react/Activity). + +--- + +### `useEffectEvent` {/*use-effect-event*/} + +One common pattern with `useEffect` is to notify the app code about some kind of "events" from an external system. For example, when a chat room gets connected, you might want to display a notification: + +```js {5,11} +function ChatRoom({ roomId, theme }) { + useEffect(() => { + const connection = createConnection(serverUrl, roomId); + connection.on('connected', () => { + showNotification('Connected!', theme); + }); + connection.connect(); + return () => { + connection.disconnect() + }; + }, [roomId, theme]); + // ... +``` + +The problem with the code above is that a change to any values used inside such an "event" will cause the surrounding Effect to re-run. For example, changing the `theme` will cause the chat room to reconnect. This makes sense for values related to the Effect logic itself, like `roomId`, but it doesn't make sense for `theme`. + +To solve this, most users just disable the lint rule and exclude the dependency. But that can lead to bugs since the linter can no longer help you keep the dependencies up to date if you need to update the Effect later. + +With `useEffectEvent`, you can split the "event" part of this logic out of the Effect that emits it: + +```js {2,3,4,9} +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]); // ✅ All dependencies declared (Effect Events aren't dependencies) + // ... +``` + +Similar to DOM events, Effect Events always “see” the latest props and state. + +**Effect Events should _not_ be declared in the dependency array**. You'll need to upgrade to `eslint-plugin-react-hooks@latest` so that the linter doesn't try to insert them as dependencies. Note that Effect Events can only be declared in the same component or Hook as "their" Effect. These restrictions are verified by the linter. + + + +#### When to use `useEffectEvent` {/*when-to-use-useeffectevent*/} + +You should use `useEffectEvent` for functions that are conceptually "events" that happen to be fired from an Effect instead of a user event (that's what makes it an "Effect Event"). You don't need to wrap everything in `useEffectEvent`, or to use it just to silence the lint error, as this can lead to bugs. + +For a deep dive on how to think about Event Effects, see: [Separating Events from Effects](/learn/separating-events-from-effects#extracting-non-reactive-logic-out-of-effects). + + + +--- + +### `cacheSignal` {/*cache-signal*/} + + + +`cacheSignal` is only for use with [React Server Components](/reference/rsc/server-components). + + + +`cacheSignal` allows you to know when the [`cache()`](/reference/react/cache) lifetime is over: + +``` +import {cache, cacheSignal} from 'react'; +const dedupedFetch = cache(fetch); + +async function Component() { + await dedupedFetch(url, { signal: cacheSignal() }); +} +``` + +This allows you to clean up or abort work when the result will no longer be used in the cache, such as: + +- React has successfully completed rendering +- The render was aborted +- The render has failed + +For more info, see the [`cacheSignal` docs](/reference/react/cacheSignal). + +--- + +### Performance Tracks {/*performance-tracks*/} + +React 19.2 adds a new set of [custom tracks](https://developer.chrome.com/docs/devtools/performance/extension) to Chrome DevTools performance profiles to provide more information about the performance of your React app: + +
+ + + + + + + + +
+ +The [React Performance Tracks docs](/reference/dev-tools/react-performance-tracks) explain everything included in the tracks, but here is a high-level overview. + +#### Scheduler ⚛ {/*scheduler-*/} + +The Scheduler track shows what React is working on for different priorities such as "blocking" for user interactions, or "transition" for updates inside startTransition. Inside each track, you will see the type of work being performed such as the event that scheduled an update, and when the render for that update happened. + +We also show information such as when an update is blocked waiting for a different priority, or when React is waiting for paint before continuing. The Scheduler track helps you understand how React splits your code into different priorities, and the order it completed the work. + +See the [Scheduler track](/reference/dev-tools/react-performance-tracks#scheduler) docs to see everything included. + +#### Components ⚛ {/*components-*/} + +The Components track shows the tree of components that React is working on either to render or run effects. Inside you'll see labels such as "Mount" for when children mount or effects are mounted, or "Blocked" for when rendering is blocked due to yielding to work outside React. + +The Components track helps you understand when components are rendered or run effects, and the time it takes to complete that work to help identify performance problems. + +See the [Components track docs](/reference/dev-tools/react-performance-tracks#components) for see everything included. + +--- + +## New React DOM Features {/*new-react-dom-features*/} + +### Partial Pre-rendering {/*partial-pre-rendering*/} + +In 19.2 we're adding a new capability to pre-render part of the app ahead of time, and resume rendering it later. + +This feature is called "Partial Pre-rendering", and allows you to pre-render the static parts of your app and serve it from a CDN, and then resume rendering the shell to fill it in with dynamic content later. + +To pre-render an app to resume later, first call `prerender` with an `AbortController`: + +``` +const {prelude, postponed} = await prerender(, { + signal: controller.signal, +}); + +// Save the postponed state for later +await savePostponedState(postponed); + +// Send prelude to client or CDN. +``` + +Then, you can return the `prelude` shell to the client, and later call `resume` to "resume" to a SSR stream: + +``` +const postponed = await getPostponedState(request); +const resumeStream = await resume(, postponed); + +// Send stream to client. +``` + +Or you can call `resumeAndPrerender` to resume to get static HTML for SSG: + +``` +const postponedState = await getPostponedState(request); +const { prelude } = await resumeAndPrerender(, postponedState); + +// Send complete HTML prelude to CDN. +``` + +For more info, see the docs for the new APIs: +- `react-dom/server` + - [`resume`](/reference/react-dom/server/resume): for Web Streams. + - [`resumeToPipeableStream`](/reference/react-dom/server/resumeToPipeableStream) for Node Streams. +- `react-dom/static` + - [`resumeAndPrerender`](/reference/react-dom/static/resumeAndPrerender) for Web Streams. + - [`resumeAndPrerenderToNodeStream`](/reference/react-dom/static/resumeAndPrerenderToNodeStream) for Node Streams. + +Additionally, the prerender apis now return a `postpone` state to pass to the `resume` apis. + +--- + +## Notable Changes {/*notable-changes*/} + +### Batching Suspense Boundaries for SSR {/*batching-suspense-boundaries-for-ssr*/} + +We fixed a behavioral bug where Suspense boundaries would reveal differently depending on if they were rendered on the client or when streaming from server-side rendering. + +Starting in 19.2, React will batch reveals of server-rendered Suspense boundaries for a short time, to allow more content to be revealed together and align with the client-rendered behavior. + + + +Previously, during streaming server-side rendering, suspense content would immediately replace fallbacks. + + + + + +In React 19.2, suspense boundaries are batched for a small amount of time, to allow revealing more content together. + + + +This fix also prepares apps for supporting `` for Suspense during SSR. By revealing more content together, animations can run in larger batches of content, and avoid chaining animations of content that stream in close together. + + + +React uses heuristics to ensure throttling does not impact core web vitals and search ranking. + +For example, if the total page load time is approaching 2.5s (which is the time considered "good" for [LCP](https://web.dev/articles/lcp)), React will stop batching and reveal content immediately so that the throttling is not the reason to miss the metric. + + + +--- + +### SSR: Web Streams support for Node {/*ssr-web-streams-support-for-node*/} + +React 19.2 adds support for Web Streams for streaming SSR in Node.js: +- [`renderToReadableStream`](/reference/react-dom/server/renderToReadableStream) is now available for Node.js +- [`prerender`](/reference/react-dom/static/prerender) is now available for Node.js + +As well as the new `resume` APIs: +- [`resume`](/reference/react-dom/server/resume) is available for Node.js. +- [`resumeAndPrerender`](/reference/react-dom/static/resumeAndPrerender) is available for Node.js. + + + + +#### Prefer Node Streams for server-side rendering in Node.js {/*prefer-node-streams-for-server-side-rendering-in-nodejs*/} + +In Node.js environments, we still highly recommend using the Node Streams APIs: + +- [`renderToPipeableStream`](/reference/react-dom/server/renderToPipeableStream) +- [`resumeToPipeableStream`](/reference/react-dom/server/resumeToPipeableStream) +- [`prerenderToNodeStream`](/reference/react-dom/static/prerenderToNodeStream) +- [`resumeAndPrerenderToNodeStream`](/reference/react-dom/static/resumeAndPrerenderToNodeStream) + +This is because Node Streams are much faster than Web Streams in Node, and Web Streams do not support compression by default, leading to users accidentally missing the benefits of streaming. + + + +--- + +### `eslint-plugin-react-hooks` v6 {/*eslint-plugin-react-hooks*/} + +We also published `eslint-plugin-react-hooks@latest` with flat config by default in the `recommended` preset, and opt-in for new React Compiler powered rules. + +To continue using the legacy config, you can change to `recommended-legacy`: + +```diff +- extends: ['plugin:react-hooks/recommended'] ++ extends: ['plugin:react-hooks/recommended-legacy'] +``` + +For a full list of compiler enabled rules, [check out the linter docs](/reference/eslint-plugin-react-hooks#recommended). + +Check out the `eslint-plugin-react-hooks` [changelog for a full list of changes](https://github.com/facebook/react/blob/main/packages/eslint-plugin-react-hooks/CHANGELOG.md#610). + +--- + +### Update the default `useId` prefix {/*update-the-default-useid-prefix*/} + +In 19.2, we're updating the default `useId` prefix from `:r:` (19.0.0) or `«r»` (19.1.0) to `_r_`. + +The original intent of using a special character that was not valid for CSS selectors was that it would be unlikely to collide with IDs written by users. However, to support View Transitions, we need to ensure that IDs generated by `useId` are valid for `view-transition-name` and XML 1.0 names. + +--- + +## Changelog {/*changelog*/} + +Other notable changes +- `react-dom`: Allow nonce to be used on hoistable styles [#32461](https://github.com/facebook/react/pull/32461) +- `react-dom`: Warn for using a React owned node as a Container if it also has text content [#32774](https://github.com/facebook/react/pull/32774) + +Notable bug fixes +- `react`: Stringify context as "SomeContext" instead of "SomeContext.Provider" [#33507](https://github.com/facebook/react/pull/33507) +- `react`: Fix infinite useDeferredValue loop in popstate event [#32821](https://github.com/facebook/react/pull/32821) +- `react`: Fix a bug when an initial value was passed to useDeferredValue [#34376](https://github.com/facebook/react/pull/34376) +- `react`: Fix a crash when submitting forms with Client Actions [#33055](https://github.com/facebook/react/pull/33055) +- `react`: Hide/unhide the content of dehydrated suspense boundaries if they resuspend [#32900](https://github.com/facebook/react/pull/32900) +- `react`: Avoid stack overflow on wide trees during Hot Reload [#34145](https://github.com/facebook/react/pull/34145) +- `react`: Improve component stacks in various places [#33629](https://github.com/facebook/react/pull/33629), [#33724](https://github.com/facebook/react/pull/33724), [#32735](https://github.com/facebook/react/pull/32735), [#33723](https://github.com/facebook/react/pull/33723) +- `react`: Fix a bug with React.use inside React.lazy-ed Component [#33941](https://github.com/facebook/react/pull/33941) +- `react-dom`: Stop warning when ARIA 1.3 attributes are used [#34264](https://github.com/facebook/react/pull/34264) +- `react-dom`: Fix a bug with deeply nested Suspense inside Suspense fallbacks [#33467](https://github.com/facebook/react/pull/33467) +- `react-dom`: Avoid hanging when suspending after aborting while rendering [#34192](https://github.com/facebook/react/pull/34192) + +For a full list of changes, please see the [Changelog](https://github.com/facebook/react/blob/main/CHANGELOG.md). + + +--- + +_Thanks to [Ricky Hanlon](https://bsky.app/profile/ricky.fm) for [writing this post](https://www.youtube.com/shorts/T9X3YkgZRG0), [Dan Abramov](https://bsky.app/profile/danabra.mov), [Matt Carroll](https://twitter.com/mattcarrollcode), [Jack Pope](https://jackpope.me), and [Joe Savona](https://x.com/en_JS) for reviewing this post._ diff --git a/src/content/blog/2025/10/07/introducing-the-react-foundation.md b/src/content/blog/2025/10/07/introducing-the-react-foundation.md new file mode 100644 index 00000000..a9b922db --- /dev/null +++ b/src/content/blog/2025/10/07/introducing-the-react-foundation.md @@ -0,0 +1,67 @@ +--- +title: "Introducing the React Foundation" +author: Seth Webster, Matt Carroll, Joe Savona +date: 2025/10/07 +description: Today, we're announcing our plans to create the React Foundation a new technical governance structure +--- + +October 7, 2025 by [Seth Webster](https://x.com/sethwebster), [Matt Carroll](https://x.com/mattcarrollcode), [Joe Savona](https://x.com/en_JS), [Sophie Alpert](https://x.com/sophiebits) + +--- + + +
+ + + + + + + + +
+ + + +Today, we're announcing our plans to create the React Foundation and a new technical governance structure. + + + +--- + +We open sourced React over a decade ago to help developers build great user experiences. From its earliest days, React has received substantial contributions from contributors outside of Meta. Over time, the number of contributors and the scope of their contributions has grown significantly. What started out as a tool developed for Meta has expanded into a project that spans multiple companies with regular contributions from across the ecosystem. React has outgrown the confines of any one company. + +To better serve the React community, we are announcing our plans to move React and React Native from Meta to a new React Foundation. As a part of this change, we will also be implementing a new independent technical governance structure. We believe these changes will enable us to give React ecosystem projects more resources. + +## The React Foundation {/*the-react-foundation*/} + +We will make the React Foundation the new home for React, React Native, and some supporting projects like JSX. The React Foundation’s mission will be to support the React community and ecosystem. Once implemented, the React Foundation will + +* Maintain React’s infrastructure like GitHub, CI, and trademarks +* Organize React Conf +* Create initiatives to support the React ecosystem like financial support of ecosystem projects, issuing grants, and creating programs + +The React Foundation will be governed by a board of directors, with Seth Webster serving as the executive director. This board will direct funds and resources to support React’s development, community, and ecosystem. We believe that this is the best structure to ensure that the React Foundation is vendor-neutral and reflects the best interests of the community. + +The founding corporate members of the React Foundation will be Amazon, Callstack, Expo, Meta, Microsoft, Software Mansion, and Vercel. These companies have had a major impact on the React and React Native ecosystems and we are grateful for their support. We are excited to welcome even more members in the future. + +
+ + + + + + + + +
+ +## React’s technical governance {/*reacts-technical-governance*/} + +We believe that React's technical direction should be set by the people who contribute to and maintain React. As React moves to a foundation, it is important that no single company or organization is overrepresented. To achieve this, we plan to define a new technical governance structure for React that is independent from the React Foundation. + +As a part of creating React’s new technical governance structure we will reach out to the community for feedback. Once finalized, we will share details in a future post. + +## Thank you {/*thank-you*/} + +React's incredible growth is thanks to the thousands of people, companies, and projects that have shaped React. The creation of the React Foundation is a testament to the strength and vibrancy of the React community. Together, the React Foundation and React’s new technical governance will ensure that React’s future is secure for years to come. diff --git a/src/content/blog/2025/10/07/react-compiler-1.md b/src/content/blog/2025/10/07/react-compiler-1.md new file mode 100644 index 00000000..080f3586 --- /dev/null +++ b/src/content/blog/2025/10/07/react-compiler-1.md @@ -0,0 +1,194 @@ +--- +title: "React Compiler v1.0" +author: Lauren Tan, Joe Savona, and Mofei Zhang +date: 2025/10/07 +description: We are releasing the compiler's first stable release today. + +--- + +Oct 7, 2025 by [Lauren Tan](https://x.com/potetotes), [Joe Savona](https://x.com/en_JS), and [Mofei Zhang](https://x.com/zmofei). + +--- + + + +The React team is excited to share new updates: + + + +1. React Compiler 1.0 is available today. +2. Compiler-powered lint rules ship in `eslint-plugin-react-hooks`'s `recommended` and `recommended-latest` preset. +3. We've published an incremental adoption guide, and partnered with Expo, Vite, and Next.js so new apps can start with the compiler enabled. + +--- + +We are releasing the compiler's first stable release today. React Compiler works on both React and React Native, and automatically optimizes components and hooks without requiring rewrites. The compiler has been battle tested on major apps at Meta and is fully production-ready. + +[React Compiler](/learn/react-compiler) is a build-time tool that optimizes your React app through automatic memoization. Last year, we published React Compiler's [first beta](/blog/2024/10/21/react-compiler-beta-release) and received lots of great feedback and contributions. We're excited about the wins we've seen from folks adopting the compiler (see case studies from [Sanity Studio](https://github.com/reactwg/react-compiler/discussions/33) and [Wakelet](https://github.com/reactwg/react-compiler/discussions/52)) and are excited to bring the compiler to more users in the React community. + +This release is the culmination of a huge and complex engineering effort spanning almost a decade. The React team's first exploration into compilers started with [Prepack](https://github.com/facebookarchive/prepack) in 2017. While this project was eventually shut down, there were many learnings that informed the team on the design of Hooks, which were designed with a future compiler in mind. In 2021, [Xuan Huang](https://x.com/Huxpro) demoed the [first iteration](https://www.youtube.com/watch?v=lGEMwh32soc) of a new take on React Compiler. + +Although this first version of the new React Compiler was eventually rewritten, the first prototype gave us increased confidence that this was a tractable problem, and the learnings that an alternative compiler architecture could precisely give us the memoization characteristics we wanted. [Joe Savona](https://x.com/en_JS), [Sathya Gunasekaran](https://x.com/_gsathya), [Mofei Zhang](https://x.com/zmofei), and [Lauren Tan](https://x.com/potetotes) worked through our first rewrite, moving the compiler's architecture into a Control Flow Graph (CFG) based High-Level Intermediate Representation (HIR). This paved the way for much more precise analysis and even type inference within React Compiler. Since then, many significant portions of the compiler have been rewritten, with each rewrite informed by our learnings from the previous attempt. And we have received significant help and contributions from many members of the [React team](/community/team) along the way. + +This stable release is our first of many. The compiler will continue to evolve and improve, and we expect to see it become a new foundation and era for the next decade and more of React. + +You can jump straight to the [quickstart](/learn/react-compiler), or read on for the highlights from React Conf 2025. + + + +#### How does React Compiler work? {/*how-does-react-compiler-work*/} + +React Compiler is an optimizing compiler that optimizes components and hooks through automatic memoization. While it is implemented as a Babel plugin currently, the compiler is largely decoupled from Babel and lowers the Abstract Syntax Tree (AST) provided by Babel into its own novel HIR, and through multiple compiler passes, carefully understands data-flow and mutability of your React code. This allows the compiler to granularly memoize values used in rendering, including the ability to memoize conditionally, which is not possible through manual memoization. + +```js {8} +import { use } from 'react'; + +export default function ThemeProvider(props) { + if (!props.children) { + return null; + } + // The compiler can still memoize code after a conditional return + const theme = mergeTheme(props.theme, use(ThemeContext)); + return ( + + {props.children} + + ); +} +``` +_See this example in the [React Compiler Playground](https://playground.react.dev/#N4Igzg9grgTgxgUxALhASwLYAcIwC4AEwBUYCBAvgQGYwQYEDkMCAhnHowNwA6AdvwQAPHPgIATBNVZQANoWpQ+HNBD4EAKgAsEGBAAU6ANzSSYACix0sYAJRF+BAmmoFzAQisQbAOjha0WXEWPntgRycCFjxYdT45WV51Sgi4NTBCPB09AgBeAj0YAHMEbV0ES2swHyzygBoSMnMyvQBhNTxhPFtbJKdo2LcIpwAeFoR2vk6hQiNWWSgEXOBavQoAPmHI4C9ff0DghD4KLZGAenHJ6bxN5N7+ChA6kDS+ajQilHRsXEyATyw5GI+gWRTQfAA8lg8Ko+GBKDQ6AxGAAjVgohCyAC0WFB4KxLHYeCxaWwgQQMDO4jQGW4-H45nCyTOZ1JWECrBhagAshBJMgCDwQPNZEKHgQwJyae8EPCQVAwZDobC7FwnuAtBAAO4ASSmFL48zAKGksjIFCAA)_ + +In addition to automatic memoization, React Compiler also has validation passes that run on your React code. These passes encode the [Rules of React](/reference/rules), and uses the compiler's understanding of data-flow and mutability to provide diagnostics where the Rules of React are broken. These diagnostics often expose latent bugs hiding in React code, and are primarily surfaced through `eslint-plugin-react-hooks`. + +To learn more about how the compiler optimizes your code, visit the [Playground](https://playground.react.dev). + + + +## Use React Compiler Today {/*use-react-compiler-today*/} +To install the compiler: + +npm + +npm install --save-dev --save-exact babel-plugin-react-compiler@latest + + +pnpm + +pnpm add --save-dev --save-exact babel-plugin-react-compiler@latest + + +yarn + +yarn add --dev --exact babel-plugin-react-compiler@latest + + +As part of the stable release, we've been making React Compiler easier to add to your projects and added optimizations to how the compiler generates memoization. React Compiler now supports optional chains and array indices as dependencies. These improvements ultimately result in fewer re-renders and more responsive UIs, while letting you keep writing idiomatic declarative code. + +You can find more details on using the Compiler in [our docs](/learn/react-compiler). + +## What we're seeing in production {/*react-compiler-at-meta*/} +[The compiler has already shipped in apps like Meta Quest Store](https://youtu.be/lyEKhv8-3n0?t=3002). We've seen initial loads and cross-page navigations improve by up to 12%, while certain interactions are more than 2.5× faster. Memory usage stays neutral even with these wins. Although your mileage may vary, we recommend experimenting with the compiler in your app to see similar performance gains. + +## Backwards Compatibility {/*backwards-compatibility*/} +As noted in the Beta announcement, React Compiler is compatible with React 17 and up. If you are not yet on React 19, you can use React Compiler by specifying a minimum target in your compiler config, and adding `react-compiler-runtime` as a dependency. You can find docs on this [here](/reference/react-compiler/target#targeting-react-17-or-18). + +## Enforce the Rules of React with compiler-powered linting {/*migrating-from-eslint-plugin-react-compiler-to-eslint-plugin-react-hooks*/} +React Compiler includes an ESLint rule that helps identify code that breaks the [Rules of React](/reference/rules). The linter does not require the compiler to be installed, so there's no risk in upgrading eslint-plugin-react-hooks. We recommend everyone upgrade today. + +If you have already installed `eslint-plugin-react-compiler`, you can now remove it and use `eslint-plugin-react-hooks@latest`. Many thanks to [@michaelfaith](https://bsky.app/profile/michael.faith) for contributing to this improvement! + +To install: + +npm + +npm install --save-dev eslint-plugin-react-hooks@latest + + +pnpm + +pnpm add --save-dev eslint-plugin-react-hooks@latest + + +yarn + +yarn add --dev eslint-plugin-react-hooks@latest + + +```js {6} +// eslint.config.js (Flat Config) +import reactHooks from 'eslint-plugin-react-hooks'; +import { defineConfig } from 'eslint/config'; + +export default defineConfig([ + reactHooks.configs.flat.recommended, +]); +``` + +```js {3} +// eslintrc.json (Legacy Config) +{ + "extends": ["plugin:react-hooks/recommended"], + // ... +} +``` + +To enable React Compiler rules, we recommend using the `recommended` preset. You can also check out the [README](https://github.com/facebook/react/blob/main/packages/eslint-plugin-react-hooks/README.md) for more instructions. Here are a few examples we featured at React Conf: + +- Catching `setState` patterns that cause render loops with [`set-state-in-render`](/reference/eslint-plugin-react-hooks/lints/set-state-in-render). +- Flagging expensive work inside effects via [`set-state-in-effect`](/reference/eslint-plugin-react-hooks/lints/set-state-in-effect). +- Preventing unsafe ref access during render with [`refs`](/reference/eslint-plugin-react-hooks/lints/refs). + +## What should I do about useMemo, useCallback, and React.memo? {/*what-should-i-do-about-usememo-usecallback-and-reactmemo*/} +By default, React Compiler will memoize your code based on its analysis and heuristics. In most cases, this memoization will be as precise, or moreso, than what you may have written — and as noted above, the compiler can memoize even in cases where `useMemo`/`useCallback` cannot be used, such as after an early return. + +However, in some cases developers may need more control over memoization. The `useMemo` and `useCallback` hooks can continue to be used with React Compiler as an escape hatch to provide control over which values are memoized. A common use-case for this is if a memoized value is used as an effect dependency, in order to ensure that an effect does not fire repeatedly even when its dependencies do not meaningfully change. + +For new code, we recommend relying on the compiler for memoization and using `useMemo`/`useCallback` where needed to achieve precise control. + +For existing code, we recommend either leaving existing memoization in place (removing it can change compilation output) or carefully testing before removing the memoization. + +## New apps should use React Compiler {/*new-apps-should-use-react-compiler*/} +We have partnered with the Expo, Vite, and Next.js teams to add the compiler to the new app experience. + +[Expo SDK 54](https://docs.expo.dev/guides/react-compiler/) and up has the compiler enabled by default, so new apps will automatically be able to take advantage of the compiler from the start. + + +npx create-expo-app@latest + + +[Vite](https://vite.dev/guide/) and [Next.js](https://nextjs.org/docs/app/api-reference/cli/create-next-app) users can choose the compiler enabled templates in `create-vite` and `create-next-app`. + + +npm create vite@latest + + +
+ + +npx create-next-app@latest + + +## Adopt React Compiler incrementally {/*adopt-react-compiler-incrementally*/} +If you're maintaining an existing application, you can roll out the compiler at your own pace. We published a step-by-step [incremental adoption guide](/learn/react-compiler/incremental-adoption) that covers gating strategies, compatibility checks, and rollout tooling so you can enable the compiler with confidence. + +## swc support (experimental) {/*swc-support-experimental*/} +React Compiler can be installed across [several build tools](/learn/react-compiler#installation) such as Babel, Vite, and Rsbuild. + +In addition to those tools, we have been collaborating with Kang Dongyoon ([@kdy1dev](https://x.com/kdy1dev)) from the [swc](https://swc.rs/) team on adding additional support for React Compiler as an swc plugin. While this work isn't done, Next.js build performance should now be considerably faster when the [React Compiler is enabled in your Next.js app](https://nextjs.org/docs/app/api-reference/config/next-config-js/reactCompiler). + +We recommend using Next.js [15.3.1](https://github.com/vercel/next.js/releases/tag/v15.3.1) or greater to get the best build performance. + +Vite users can continue to use [vite-plugin-react](https://github.com/vitejs/vite-plugin-react) to enable the compiler, by adding it as a [Babel plugin](/learn/react-compiler/installation#vite). We are also working with the [oxc](https://oxc.rs/) team to [add support for the compiler](https://github.com/oxc-project/oxc/issues/10048). Once [rolldown](https://github.com/rolldown/rolldown) is officially released and supported in Vite and oxc support is added for React Compiler, we'll update the docs with information on how to migrate. + +## Upgrading React Compiler {/*upgrading-react-compiler*/} +React Compiler works best when the auto-memoization applied is strictly for performance. Future versions of the compiler may change how memoization is applied, for example it could become more granular and precise. + +However, because product code may sometimes break the [rules of React](/reference/rules) in ways that aren't always statically detectable in JavaScript, changing memoization can occasionally have unexpected results. For example, a previously memoized value might be used as a dependency for a `useEffect` somewhere in the component tree. Changing how or whether this value is memoized can cause over or under-firing of that `useEffect`. While we encourage [useEffect only for synchronization](/learn/synchronizing-with-effects), your codebase may have `useEffect`s that cover other use cases, such as effects that needs to only run in response to specific values changing. + +In other words, changing memoization may under rare circumstances cause unexpected behavior. For this reason, we recommend following the Rules of React and employing continuous end-to-end testing of your app so you can upgrade the compiler with confidence and identify any rules of React violations that might cause issues. + +If you don't have good test coverage, we recommend pinning the compiler to an exact version (eg `1.0.0`) rather than a SemVer range (eg `^1.0.0`). You can do this by passing the `--save-exact` (npm/pnpm) or `--exact` flags (yarn) when upgrading the compiler. You should then do any upgrades of the compiler manually, taking care to check that your app still works as expected. + +--- + +Thanks to [Jason Bonta](https://x.com/someextent), [Jimmy Lai](https://x.com/feedthejim), [Kang Dongyoon](https://x.com/kdy1dev) (@kdy1dev), and [Dan Abramov](https://bsky.app/profile/danabra.mov) for reviewing and editing this post. diff --git a/src/content/blog/2025/10/16/react-conf-2025-recap.md b/src/content/blog/2025/10/16/react-conf-2025-recap.md new file mode 100644 index 00000000..8476b02a --- /dev/null +++ b/src/content/blog/2025/10/16/react-conf-2025-recap.md @@ -0,0 +1,133 @@ +--- +title: "React Conf 2025 Recap" +author: Matt Carroll and Ricky Hanlon +date: 2025/10/16 +description: Last week we hosted React Conf 2025, in this post, we summarize the talks and announcements from the event... +--- + +Oct 16, 2025 by [Matt Carroll](https://x.com/mattcarrollcode) and [Ricky Hanlon](https://bsky.app/profile/ricky.fm) + +--- + + + +Last week we hosted React Conf 2025 where we announced the [React Foundation](/blog/2025/10/07/introducing-the-react-foundation) and showcased new features coming to React and React Native. + + + +--- + +React Conf 2025 was held on October 7-8, 2025, in Henderson, Nevada. + +The entire [day 1](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=1067s) and [day 2](https://www.youtube.com/watch?v=p9OcztRyDl0&t=2299s) streams are available online, and you can view photos from the event [here](https://conf.react.dev/photos). + +In this post, we'll summarize the talks and announcements from the event. + + +## Day 1 Keynote {/*day-1-keynote*/} + +_Watch the full day 1 stream [here.](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=1067s)_ + +In the day 1 keynote, Joe Savona shared the updates from the team and community since the last React Conf and highlights from React 19.0 and 19.1. + +Mofei Zhang highlighted the new features in React 19.2 including: +* [``](https://react.dev/reference/react/Activity) — a new component to manage visibility. +* [`useEffectEvent`](https://react.dev/reference/react/useEffectEvent) to fire events from Effects. +* [Performance Tracks](https://react.dev/reference/dev-tools/react-performance-tracks) — a new profiling tool in DevTools. +* [Partial Pre-Rendering](https://react.dev/blog/2025/10/01/react-19-2#partial-pre-rendering) to pre-render part of an app ahead of time, and resume rendering it later. + +Jack Pope announced new features in Canary including: + +* [``](https://react.dev/reference/react/ViewTransition) — a new component to animate page transitions. +* [Fragment Refs](https://react.dev/reference/react/Fragment#fragmentinstance) — a new way to interact with the DOM nodes wrapped by a Fragment. + +Lauren Tan announced [React Compiler v1.0](https://react.dev/blog/2025/10/07/react-compiler-1) and recommended all apps use React Compiler for benefits like: +* [Automatic memoization](/learn/react-compiler/introduction#what-does-react-compiler-do) that understands React code. +* [New lint rules](/learn/react-compiler/installation#eslint-integration) powered by React Compiler to teach best practices. +* [Default support](/learn/react-compiler/installation#basic-setup) for new apps in Vite, Next.js, and Expo. +* [Migration guides](/learn/react-compiler/incremental-adoption) for existing apps migrating to React Compiler. + +Finally, Seth Webster announced the [React Foundation](/blog/2025/10/07/introducing-the-react-foundation) to steward React's open source development and community. + +Watch day 1 here: + + + +## Day 2 Keynote {/*day-2-keynote*/} + +_Watch the full day 2 stream [here.](https://www.youtube.com/watch?v=p9OcztRyDl0&t=2299s)_ + +Jorge Cohen and Nicola Corti kicked off day 2 highlighting React Native’s incredible growth with 4M weekly downloads (100% growth YoY), and some notable app migrations from Shopify, Zalando, and HelloFresh, award-winning apps like RISE, RUNNA, and Partyful, and AI apps from Mistral, Replit, and v0. + +Riccardo Cipolleschi shared two major announcements for React Native: +- [React Native 0.82 will be New Architecture only](https://reactnative.dev/blog/2025/10/08/react-native-0.82#new-architecture-only) +- [Experimental Hermes V1 support](https://reactnative.dev/blog/2025/10/08/react-native-0.82#experimental-hermes-v1) + +Ruben Norte and Alex Hunt finished out the keynote by announcing: +- [New web-aligned DOM APIs](https://reactnative.dev/blog/2025/10/08/react-native-0.82#dom-node-apis) for improved compatibility with React on the web. +- [New Performance APIs](https://reactnative.dev/blog/2025/10/08/react-native-0.82#web-performance-apis-canary) with a new network panel and desktop app. + +Watch day 2 here: + + + + +## React team talks {/*react-team-talks*/} + +Throughout the conference, there were talks from the React team including: +* [Async React Part I](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=10907s) and [Part II](https://www.youtube.com/watch?v=p9OcztRyDl0&t=29073s) [(Ricky Hanlon)](https://x.com/rickhanlonii) showed what's possible using the last 10 years of innovation. +* [Exploring React Performance](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=20274s) [(Joe Savona)](https://x.com/en_js) showed the results of our React performance research. +* [Reimagining Lists in React Native](https://www.youtube.com/watch?v=p9OcztRyDl0&t=10382s) [(Luna Wei)](https://x.com/lunaleaps) introduced Virtual View, a new primitive for lists that manages visibility with mode-based rendering (hidden/pre-render/visible). +* [Profiling with React Performance tracks](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=8276s) [(Ruslan Lesiutin)](https://x.com/ruslanlesiutin) showed how to use the new React Performance Tracks to debug performance issues and build great apps. +* [React Strict DOM](https://www.youtube.com/watch?v=p9OcztRyDl0&t=9026s) [(Nicolas Gallagher)](https://nicolasgallagher.com/) talked about Meta's approach to using web code on native. +* [View Transitions and Activity](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=4870s) [(Chance Strickland)](https://x.com/chancethedev) — Chance worked with the React team to showcase how to use `` and `` to build fast, native-feeling animations. +* [In case you missed the memo](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=9525s) [(Cody Olsen)](https://bsky.app/profile/codey.bsky.social) - Cody worked with the React team to adopt the Compiler at Sanity Studio, and shared how it went. +## React framework talks {/*react-framework-talks*/} + +The second half of day 2 had a series of talks from React Framework teams including: + +* [React Native, Amplified](https://www.youtube.com/watch?v=p9OcztRyDl0&t=5737s) by [Giovanni Laquidara](https://x.com/giolaq) and [Eric Fahsl](https://x.com/efahsl). +* [React Everywhere: Bringing React Into Native Apps](https://www.youtube.com/watch?v=p9OcztRyDl0&t=18213s) by [Mike Grabowski](https://x.com/grabbou). +* [How Parcel Bundles React Server Components](https://www.youtube.com/watch?v=p9OcztRyDl0&t=19538s) by [Devon Govett](https://x.com/devonovett). +* [Designing Page Transitions](https://www.youtube.com/watch?v=p9OcztRyDl0&t=20640s) by [Delba de Oliveira](https://x.com/delba_oliveira). +* [Build Fast, Deploy Faster — Expo in 2025](https://www.youtube.com/watch?v=p9OcztRyDl0&t=21350s) by [Evan Bacon](https://x.com/baconbrix). +* [The React Router's take on RSC](https://www.youtube.com/watch?v=p9OcztRyDl0&t=22367s) by [Kent C. Dodds](https://x.com/kentcdodds). +* [RedwoodSDK: Web Standards Meet Full-Stack React](https://www.youtube.com/watch?v=p9OcztRyDl0&t=24992s) by [Peter Pistorius](https://x.com/appfactory) and [Aurora Scharff](https://x.com/aurorascharff). +* [TanStack Start](https://www.youtube.com/watch?v=p9OcztRyDl0&t=26065s) by [Tanner Linsley](https://x.com/tannerlinsley). + +## Q&A {/*q-and-a*/} +There were three Q&A panels during the conference: + +* [React Team at Meta Q&A](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=26304s) hosted by [Shruti Kapoor](https://x.com/shrutikapoor08) +* [React Frameworks Q&A](https://www.youtube.com/watch?v=p9OcztRyDl0&t=26812s) hosted by [Jack Herrington](https://x.com/jherr) +* [React and AI Panel](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=18741s) hosted by [Lee Robinson](https://x.com/leerob) + +## And more... {/*and-more*/} + +We also heard talks from the community including: +* [Building an MCP Server](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=24204s) by [James Swinton](https://x.com/JamesSwintonDev) ([AG Grid](https://www.ag-grid.com/?utm_source=react-conf&utm_medium=react-conf-homepage&utm_campaign=react-conf-sponsorship-2025)) +* [Modern Emails using React](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=25521s) by [Zeno Rocha](https://x.com/zenorocha) ([Resend](https://resend.com/)) +* [Why React Native Apps Make All the Money](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=24917s) by [Perttu Lähteenlahti](https://x.com/plahteenlahti) ([RevenueCat](https://www.revenuecat.com/)) +* [The invisible craft of great UX](https://www.youtube.com/watch?v=zyVRg2QR6LA&t=23400s) by [Michał Dudak](https://x.com/michaldudak) ([MUI](https://mui.com/)) + +## Thanks {/*thanks*/} + +Thank you to all the staff, speakers, and participants, who made React Conf 2025 possible. There are too many to list, but we want to thank a few in particular. + +Thank you to [Matt Carroll](https://x.com/mattcarrollcode) for planning the entire event and building the conference website. + +Thank you to [Michael Chan](https://x.com/chantastic) for MCing React Conf with incredible dedication and energy, delivering thoughtful speaker intros, fun jokes, and genuine enthusiasm throughout the event. Thank you to [Jorge Cohen](https://x.com/JorgeWritesCode) for hosting the livestream, interviewing each speaker, and bringing the in-person React Conf experience online. + +Thank you to [Mateusz Kornacki](https://x.com/mat_kornacki), [Mike Grabowski](https://x.com/grabbou), [Kris Lis](https://www.linkedin.com/in/krzysztoflisakakris/) and the team at [Callstack](https://www.callstack.com/) for co-organizing React Conf and providing design, engineering, and marketing support. Thank you to the [ZeroSlope team](https://zeroslopeevents.com/contact-us/): Sunny Leggett, Tracey Harrison, Tara Larish, Whitney Pogue, and Brianne Smythia for helping to organize the event. + +Thank you to [Jorge Cabiedes Acosta](https://github.com/jorge-cab), [Gijs Weterings](https://x.com/gweterings), [Tim Yung](https://x.com/yungsters), and [Jason Bonta](https://x.com/someextent) for bringing questions from the Discord to the livestream. Thank you to [Lynn Yu](https://github.com/lynnshaoyu) for leading the moderation of the Discord. Thank you to [Seth Webster](https://x.com/sethwebster) for welcoming us each day; and to [Christopher Chedeau](https://x.com/vjeux), [Kevin Gozali](https://x.com/fkgozali), and [Pieter De Baets](https://x.com/Javache) for joining us with a special message during the after-party. + +Thank you to [Kadi Kraman](https://x.com/kadikraman), [Beto](https://x.com/betomoedano) and [Nicolas Solerieu](https://www.linkedin.com/in/nicolas-solerieu/) for building the conference mobile app. Thank you [Wojtek Szafraniec](https://x.com/wojteg1337) for help with the conference website. Thank you to [Mustache](https://www.mustachepower.com/) & [Cornerstone](https://cornerstoneav.com/) for the visuals, stage, and sound; and to the Westin Hotel for hosting us. + +Thank you to all the sponsors who made the event possible: [Amazon](https://www.developer.amazon.com), [MUI](https://mui.com/), [Vercel](https://vercel.com/), [Expo](https://expo.dev/), [RedwoodSDK](https://rwsdk.com), [Ag Grid](https://www.ag-grid.com), [RevenueCat](https://www.revenuecat.com/), [Resend](https://resend.com), [Mux](https://www.mux.com/), [Old Mission](https://www.oldmissioncapital.com/), [Arcjet](https://arcjet.com), [Infinite Red](https://infinite.red/), and [RenderATL](https://renderatl.com). + +Thank you to all the speakers who shared their knowledge and experience with the community. + +Finally, thank you to everyone who attended in person and online to show what makes React, React. React is more than a library, it is a community, and it was inspiring to see everyone come together to share and learn together. + +See you next time! diff --git a/src/content/blog/index.md b/src/content/blog/index.md index a7a89763..10d27790 100644 --- a/src/content/blog/index.md +++ b/src/content/blog/index.md @@ -12,15 +12,33 @@ You can also follow the [@react.dev](https://bsky.app/profile/react.dev) account
- + -In React Labs posts, we write about projects in active research and development. In this post, we're sharing two new experimental features that are ready to try today, and sharing other areas we're working on now ... +Last week we hosted React Conf 2025. In this post, we summarize the talks and announcements from the event... + + + + + +We're releasing the compiler's first stable release today, plus linting and tooling improvements to make adoption easier. + + + + + +Today, we're announcing our plans to create the React Foundation and a new technical governance structure ... + + + + + +React 19.2 adds new features like Activity, React Performance Tracks, useEffectEvent, and more. In this post ... - + -We are releasing the compiler's first Release Candidate (RC) today. +In React Labs posts, we write about projects in active research and development. In this post, we're sharing two new experimental features that are ready to try today, and sharing other areas we're working on now ... diff --git a/src/content/community/conferences.md b/src/content/community/conferences.md index 2a65ea47..86d7403c 100644 --- a/src/content/community/conferences.md +++ b/src/content/community/conferences.md @@ -34,12 +34,6 @@ October 31 - November 01, 2025. In-person in Goa, India (hybrid event) + Oct 15 [Website](https://www.reactindia.io) - [Twitter](https://twitter.com/react_india) - [Facebook](https://www.facebook.com/ReactJSIndia) - [Youtube](https://www.youtube.com/channel/UCaFbHCBkPvVv1bWs_jwYt3w) - -### CityJS New Delhi 2025 {/*cityjs-newdelhi*/} -November 6-7, 2025. In-person in New Delhi, India - -[Website](https://india.cityjsconf.org/) - [Twitter](https://x.com/cityjsconf) - [Bluesky](https://bsky.app/profile/cityjsconf.bsky.social) - ### React Summit US 2025 {/*react-summit-us-2025*/} November 18 - 21, 2025. In-person in New York, USA + remote (hybrid event) @@ -50,12 +44,29 @@ November 28 & December 1, 2025. In-person in London, UK + online (hybrid event) [Website](https://reactadvanced.com/) - [Twitter](https://x.com/reactadvanced) +### CityJS Singapore 2026 {/*cityjs-singapore-2026*/} +February 4-6, 2026. In-person in Singapore + +[Website](https://india.cityjsconf.org/) - [Twitter](https://x.com/cityjsconf) - [Bluesky](https://bsky.app/profile/cityjsconf.bsky.social) + +### CityJS New Delhi 2026 {/*cityjs-newdelhi-2026*/} +February 12-13, 2026. In-person in New Delhi, India + +[Website](https://india.cityjsconf.org/) - [Twitter](https://x.com/cityjsconf) - [Bluesky](https://bsky.app/profile/cityjsconf.bsky.social) + + ### React Paris 2026 {/*react-paris-2026*/} March 26 - 27, 2026. In-person in Paris, France (hybrid event) [Website](https://react.paris/) - [Twitter](https://x.com/BeJS_) +### CityJS London 2026 {/*cityjs-london-2026*/} +April 14-17, 2026. In-person in London + +[Website](https://india.cityjsconf.org/) - [Twitter](https://x.com/cityjsconf) - [Bluesky](https://bsky.app/profile/cityjsconf.bsky.social) + + ## Past Conferences {/*past-conferences*/} diff --git a/src/content/errors/index.md b/src/content/errors/index.md index 25746d25..d4fc3927 100644 --- a/src/content/errors/index.md +++ b/src/content/errors/index.md @@ -7,4 +7,4 @@ In the minified production build of React, we avoid sending down full error mess We highly recommend using the development build locally when debugging your app since it tracks additional debug info and provides helpful warnings about potential problems in your apps, but if you encounter an exception while using the production build, the error message will include just a link to the docs for the error. -For an example, see: [https://react.dev/errors/149](/errors/421). +For an example, see: [https://react.dev/errors/149](/errors/149). diff --git a/src/content/learn/add-react-to-an-existing-project.md b/src/content/learn/add-react-to-an-existing-project.md index 5d3d4400..f98bece4 100644 --- a/src/content/learn/add-react-to-an-existing-project.md +++ b/src/content/learn/add-react-to-an-existing-project.md @@ -20,7 +20,7 @@ Let's say you have an existing web app at `example.com` built with another serve Here's how we recommend to set it up: -1. **Build the React part of your app** using one of the [React-based frameworks](/learn/start-a-new-react-project). +1. **Build the React part of your app** using one of the [React-based frameworks](/learn/creating-a-react-app). 2. **Specify `/some-app` as the *base path*** in your framework's configuration (here's how: [Next.js](https://nextjs.org/docs/app/api-reference/config/next-config-js/basePath), [Gatsby](https://www.gatsbyjs.com/docs/how-to/previews-deploys-hosting/path-prefix/)). 3. **Configure your server or a proxy** so that all requests under `/some-app/` are handled by your React app. @@ -149,7 +149,7 @@ root.render(); Notice how the original HTML content from `index.html` is preserved, but your own `NavigationBar` React component now appears inside the `
}> + 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 00000000..daa7db6a --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/exhaustive-deps.md @@ -0,0 +1,169 @@ +--- +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*/} + +You can configure custom effect hooks using shared ESLint settings (available in `eslint-plugin-react-hooks` 6.1.1 and later): + +```js +{ + "settings": { + "react-hooks": { + "additionalEffectHooks": "(useMyEffect|useCustomEffect)" + } + } +} +``` + +- `additionalEffectHooks`: Regex pattern matching custom hooks that should be checked for exhaustive dependencies. This configuration is shared across all `react-hooks` rules. + +For backward compatibility, this rule also accepts a rule-level option: + +```js +{ + "rules": { + "react-hooks/exhaustive-deps": ["warn", { + "additionalHooks": "(useMyCustomHook|useAnotherHook)" + }] + } +} +``` + +- `additionalHooks`: Regex for hooks that should be checked for exhaustive dependencies. **Note:** If this rule-level option is specified, it takes precedence over the shared `settings` configuration. 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 00000000..3bd662a8 --- /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 00000000..fe0cbe00 --- /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 00000000..2314cde0 --- /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 00000000..e057e197 --- /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 00000000..93b582b1 --- /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 00000000..af8aacc6 --- /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 00000000..3108fdd8 --- /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 00000000..a364ab67 --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/rules-of-hooks.md @@ -0,0 +1,179 @@ +--- +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}
; +} + +// ✅ Conditionally derive state from props and state from previous renders +function Component({ items }) { + const [isReverse, setIsReverse] = useState(false); + const [selection, setSelection] = useState(null); + + const [prevItems, setPrevItems] = useState(items); + if (items !== prevItems) { // This condition makes it valid + setPrevItems(items); + setSelection(null); + } + // ... +} +``` + +## 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`. + +In rare cases, you may need to adjust state based on information from previous renders. For those, follow [this pattern](https://react.dev/reference/react/useState#storing-information-from-previous-renders) of setting state conditionally. 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 00000000..bd52f070 --- /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 00000000..a3eefcdb --- /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 00000000..a5a77e5f --- /dev/null +++ b/src/content/reference/eslint-plugin-react-hooks/lints/use-memo.md @@ -0,0 +1,94 @@ +--- +title: use-memo +--- + + + +Validates that the `useMemo` hook is used with 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-compiler/compiling-libraries.md b/src/content/reference/react-compiler/compiling-libraries.md index f09ffcb7..ec0a7581 100644 --- a/src/content/reference/react-compiler/compiling-libraries.md +++ b/src/content/reference/react-compiler/compiling-libraries.md @@ -21,7 +21,7 @@ As a library author, you can compile your library code before publishing to npm. Add React Compiler to your library's build process: -npm install -D babel-plugin-react-compiler@rc +npm install -D babel-plugin-react-compiler@latest Configure your build tool to compile your library. For example, with Babel: @@ -45,13 +45,13 @@ If your library supports React versions below 19, you'll need additional configu We recommend installing react-compiler-runtime as a direct dependency: -npm install react-compiler-runtime@rc +npm install react-compiler-runtime@latest ```json { "dependencies": { - "react-compiler-runtime": "^19.1.0-rc.2" + "react-compiler-runtime": "^1.0.0" }, "peerDependencies": { "react": "^17.0.0 || ^18.0.0 || ^19.0.0" diff --git a/src/content/reference/react-compiler/configuration.md b/src/content/reference/react-compiler/configuration.md index f38f1afc..ec9b27e6 100644 --- a/src/content/reference/react-compiler/configuration.md +++ b/src/content/reference/react-compiler/configuration.md @@ -130,7 +130,7 @@ module.exports = { Older React versions need the runtime package and target configuration: ```bash -npm install react-compiler-runtime@rc +npm install react-compiler-runtime@latest ``` ```js diff --git a/src/content/reference/react-compiler/target.md b/src/content/reference/react-compiler/target.md index 38174851..8ccc4a6b 100644 --- a/src/content/reference/react-compiler/target.md +++ b/src/content/reference/react-compiler/target.md @@ -45,7 +45,7 @@ Configures the React version compatibility for the compiled output. - Always use string values, not numbers (e.g., `'17'` not `17`) - Don't include patch versions (e.g., use `'18'` not `'18.2.0'`) - React 19 includes built-in compiler runtime APIs -- React 17 and 18 require installing `react-compiler-runtime@rc` +- React 17 and 18 require installing `react-compiler-runtime@latest` --- @@ -75,7 +75,7 @@ For React 17 and React 18 projects, you need two steps: 1. Install the runtime package: ```bash -npm install react-compiler-runtime@rc +npm install react-compiler-runtime@latest ``` 2. Configure the target: @@ -114,7 +114,7 @@ If you see errors like "Cannot find module 'react/compiler-runtime'": 2. If using React 17 or 18, install the runtime: ```bash - npm install react-compiler-runtime@rc + npm install react-compiler-runtime@latest ``` 3. Ensure your target matches your React version: @@ -130,7 +130,7 @@ Ensure the runtime package is: 1. Installed in your project (not globally) 2. Listed in your `package.json` dependencies -3. The correct version (`@rc` tag) +3. The correct version (`@latest` tag) 4. Not in `devDependencies` (it's needed at runtime) ### Checking compiled output {/*checking-output*/} diff --git a/src/content/reference/react-dom/client/createRoot.md b/src/content/reference/react-dom/client/createRoot.md index da12ee27..7f6434b9 100644 --- a/src/content/reference/react-dom/client/createRoot.md +++ b/src/content/reference/react-dom/client/createRoot.md @@ -209,7 +209,7 @@ When your HTML is empty, the user sees a blank page until the app's JavaScript c
``` -This can feel very slow! To solve this, you can generate the initial HTML from your components [on the server or during the build.](/reference/react-dom/server) Then your visitors can read text, see images, and click links before any of the JavaScript code loads. We recommend [using a framework](/learn/start-a-new-react-project#full-stack-frameworks) that does this optimization out of the box. Depending on when it runs, this is called *server-side rendering (SSR)* or *static site generation (SSG).* +This can feel very slow! To solve this, you can generate the initial HTML from your components [on the server or during the build.](/reference/react-dom/server) Then your visitors can read text, see images, and click links before any of the JavaScript code loads. We recommend [using a framework](/learn/creating-a-react-app#full-stack-frameworks) that does this optimization out of the box. Depending on when it runs, this is called *server-side rendering (SSR)* or *static site generation (SSG).* diff --git a/src/content/reference/react-dom/client/hydrateRoot.md b/src/content/reference/react-dom/client/hydrateRoot.md index b74e2c38..c48b6eb5 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/client/index.md b/src/content/reference/react-dom/client/index.md index a0042202..b612d7ba 100644 --- a/src/content/reference/react-dom/client/index.md +++ b/src/content/reference/react-dom/client/index.md @@ -4,7 +4,7 @@ title: Client React DOM APIs -The `react-dom/client` APIs let you render React components on the client (in the browser). These APIs are typically used at the top level of your app to initialize your React tree. A [framework](/learn/start-a-new-react-project#full-stack-frameworks) may call them for you. Most of your components don't need to import or use them. +The `react-dom/client` APIs let you render React components on the client (in the browser). These APIs are typically used at the top level of your app to initialize your React tree. A [framework](/learn/creating-a-react-app#full-stack-frameworks) may call them for you. Most of your components don't need to import or use them. diff --git a/src/content/reference/react-dom/components/form.md b/src/content/reference/react-dom/components/form.md index b17b1a40..1043b13a 100644 --- a/src/content/reference/react-dom/components/form.md +++ b/src/content/reference/react-dom/components/form.md @@ -278,7 +278,7 @@ export default function Search() { Displaying a form submission error message before the JavaScript bundle loads for progressive enhancement requires that: -1. `
` be rendered by a [Server Component](/reference/rsc/use-client) +1. `` be rendered by a [Client Component](/reference/rsc/use-client) 1. the function passed to the ``'s `action` prop be a [Server Function](/reference/rsc/server-functions) 1. the `useActionState` Hook be used to display the error message diff --git a/src/content/reference/react-dom/hooks/index.md b/src/content/reference/react-dom/hooks/index.md index 5dfb07d8..5bda2b5a 100644 --- a/src/content/reference/react-dom/hooks/index.md +++ b/src/content/reference/react-dom/hooks/index.md @@ -4,7 +4,7 @@ title: "Built-in React DOM Hooks" -The `react-dom` package contains Hooks that are only supported for web applications (which run in the browser DOM environment). These Hooks are not supported in non-browser environments like iOS, Android, or Windows applications. If you are looking for Hooks that are supported in web browsers *and other environments* see [the React Hooks page](/reference/react). This page lists all the Hooks in the `react-dom` package. +The `react-dom` package contains Hooks that are only supported for web applications (which run in the browser DOM environment). These Hooks are not supported in non-browser environments like iOS, Android, or Windows applications. If you are looking for Hooks that are supported in web browsers *and other environments* see [the React Hooks page](/reference/react/hooks). This page lists all the Hooks in the `react-dom` package. diff --git a/src/content/reference/react-dom/index.md b/src/content/reference/react-dom/index.md index b79b16db..d01bd656 100644 --- a/src/content/reference/react-dom/index.md +++ b/src/content/reference/react-dom/index.md @@ -21,7 +21,7 @@ These APIs can be imported from your components. They are rarely used: These APIs can be used to make apps faster by pre-loading resources such as scripts, stylesheets, and fonts as soon as you know you need them, for example before navigating to another page where the resources will be used. -[React-based frameworks](/learn/start-a-new-react-project) frequently handle resource loading for you, so you might not have to call these APIs yourself. Consult your framework's documentation for details. +[React-based frameworks](/learn/creating-a-react-app) frequently handle resource loading for you, so you might not have to call these APIs yourself. Consult your framework's documentation for details. * [`prefetchDNS`](/reference/react-dom/prefetchDNS) lets you prefetch the IP address of a DNS domain name that you expect to connect to. * [`preconnect`](/reference/react-dom/preconnect) lets you connect to a server you expect to request resources from, even if you don't know what resources you'll need yet. diff --git a/src/content/reference/react-dom/preinit.md b/src/content/reference/react-dom/preinit.md index 117fccac..5dcaaf93 100644 --- a/src/content/reference/react-dom/preinit.md +++ b/src/content/reference/react-dom/preinit.md @@ -4,7 +4,7 @@ title: preinit -[React-based frameworks](/learn/start-a-new-react-project) frequently handle resource loading for you, so you might not have to call this API yourself. Consult your framework's documentation for details. +[React-based frameworks](/learn/creating-a-react-app) frequently handle resource loading for you, so you might not have to call this API yourself. Consult your framework's documentation for details. diff --git a/src/content/reference/react-dom/preinitModule.md b/src/content/reference/react-dom/preinitModule.md index 97bb4dbc..93a4a730 100644 --- a/src/content/reference/react-dom/preinitModule.md +++ b/src/content/reference/react-dom/preinitModule.md @@ -4,7 +4,7 @@ title: preinitModule -[React-based frameworks](/learn/start-a-new-react-project) frequently handle resource loading for you, so you might not have to call this API yourself. Consult your framework's documentation for details. +[React-based frameworks](/learn/creating-a-react-app) frequently handle resource loading for you, so you might not have to call this API yourself. Consult your framework's documentation for details. diff --git a/src/content/reference/react-dom/preload.md b/src/content/reference/react-dom/preload.md index 5dcba10f..e9d00fc6 100644 --- a/src/content/reference/react-dom/preload.md +++ b/src/content/reference/react-dom/preload.md @@ -4,7 +4,7 @@ title: preload -[React-based frameworks](/learn/start-a-new-react-project) frequently handle resource loading for you, so you might not have to call this API yourself. Consult your framework's documentation for details. +[React-based frameworks](/learn/creating-a-react-app) frequently handle resource loading for you, so you might not have to call this API yourself. Consult your framework's documentation for details. diff --git a/src/content/reference/react-dom/preloadModule.md b/src/content/reference/react-dom/preloadModule.md index ebc2fa6d..944d438f 100644 --- a/src/content/reference/react-dom/preloadModule.md +++ b/src/content/reference/react-dom/preloadModule.md @@ -4,7 +4,7 @@ title: preloadModule -[React-based frameworks](/learn/start-a-new-react-project) frequently handle resource loading for you, so you might not have to call this API yourself. Consult your framework's documentation for details. +[React-based frameworks](/learn/creating-a-react-app) frequently handle resource loading for you, so you might not have to call this API yourself. Consult your framework's documentation for details. diff --git a/src/content/reference/react-dom/server/index.md b/src/content/reference/react-dom/server/index.md index 72972c32..1856acd7 100644 --- a/src/content/reference/react-dom/server/index.md +++ b/src/content/reference/react-dom/server/index.md @@ -4,25 +4,33 @@ title: Server React DOM APIs -The `react-dom/server` APIs let you server-side render React components to HTML. These APIs are only used on the server at the top level of your app to generate the initial HTML. A [framework](/learn/start-a-new-react-project#full-stack-frameworks) may call them for you. Most of your components don't need to import or use them. +The `react-dom/server` APIs let you server-side render React components to HTML. These APIs are only used on the server at the top level of your app to generate the initial HTML. A [framework](/learn/creating-a-react-app#full-stack-frameworks) may call them for you. Most of your components don't need to import or use them. --- -## Server APIs for Node.js Streams {/*server-apis-for-nodejs-streams*/} +## Server APIs for Web Streams {/*server-apis-for-web-streams*/} -These methods are only available in the environments with [Node.js Streams:](https://nodejs.org/api/stream.html) +These methods are only available in the environments with [Web Streams](https://developer.mozilla.org/en-US/docs/Web/API/Streams_API), which includes browsers, Deno, and some modern edge runtimes: -* [`renderToPipeableStream`](/reference/react-dom/server/renderToPipeableStream) renders a React tree to a pipeable [Node.js Stream.](https://nodejs.org/api/stream.html) +* [`renderToReadableStream`](/reference/react-dom/server/renderToReadableStream) renders a React tree to a [Readable Web Stream.](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) +* [`resume`](/reference/react-dom/server/renderToPipeableStream) resumes [`prerender`](/reference/react-dom/static/prerender) to a [Readable Web Stream](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream). + + + +Node.js also includes these methods for compatibility, but they are not recommended due to worse performance. Use the [dedicated Node.js APIs](#server-apis-for-nodejs-streams) instead. + + --- -## Server APIs for Web Streams {/*server-apis-for-web-streams*/} +## Server APIs for Node.js Streams {/*server-apis-for-nodejs-streams*/} -These methods are only available in the environments with [Web Streams](https://developer.mozilla.org/en-US/docs/Web/API/Streams_API), which includes browsers, Deno, and some modern edge runtimes: +These methods are only available in the environments with [Node.js Streams:](https://nodejs.org/api/stream.html) -* [`renderToReadableStream`](/reference/react-dom/server/renderToReadableStream) renders a React tree to a [Readable Web Stream.](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) +* [`renderToPipeableStream`](/reference/react-dom/server/renderToPipeableStream) renders a React tree to a pipeable [Node.js Stream.](https://nodejs.org/api/stream.html) +* [`resumeToPipeableStream`](/reference/react-dom/server/renderToPipeableStream) resumes [`prerenderToNodeStream`](/reference/react-dom/static/prerenderToNodeStream) to a pipeable [Node.js Stream.](https://nodejs.org/api/stream.html) --- diff --git a/src/content/reference/react-dom/server/resume.md b/src/content/reference/react-dom/server/resume.md new file mode 100644 index 00000000..17b48b2a --- /dev/null +++ b/src/content/reference/react-dom/server/resume.md @@ -0,0 +1,236 @@ +--- +title: resume +--- + + + +`resume` streams a pre-rendered React tree to a [Readable Web Stream.](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) + +```js +const stream = await resume(reactNode, postponedState, options?) +``` + + + + + + + +This API depends on [Web Streams.](https://developer.mozilla.org/en-US/docs/Web/API/Streams_API) For Node.js, use [`resumeToNodeStream`](/reference/react-dom/server/renderToPipeableStream) instead. + + + +--- + +## Reference {/*reference*/} + +### `resume(node, postponedState, options?)` {/*resume*/} + +Call `resume` to resume rendering a pre-rendered React tree as HTML into a [Readable Web Stream.](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) + +```js +import { resume } from 'react-dom/server'; +import {getPostponedState} from './storage'; + +async function handler(request, writable) { + const postponed = await getPostponedState(request); + const resumeStream = await resume(, postponed); + return resumeStream.pipeTo(writable) +} +``` + +[See more examples below.](#usage) + +#### Parameters {/*parameters*/} + +* `reactNode`: The React node you called `prerender` with. For example, a JSX element like ``. It is expected to represent the entire document, so the `App` component should render the `` tag. +* `postponedState`: The opaque `postpone` object returned from a [prerender API](/reference/react-dom/static/index), loaded from wherever you stored it (e.g. redis, a file, or S3). +* **optional** `options`: An object with streaming options. + * **optional** `nonce`: A [`nonce`](http://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#nonce) string to allow scripts for [`script-src` Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src). + * **optional** `signal`: An [abort signal](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal) that lets you [abort server rendering](#aborting-server-rendering) and render the rest on the client. + * **optional** `onError`: A callback that fires whenever there is a server error, whether [recoverable](/reference/react-dom/server/renderToReadableStream#recovering-from-errors-outside-the-shell) or [not.](/reference/react-dom/server/renderToReadableStream#recovering-from-errors-inside-the-shell) By default, this only calls `console.error`. If you override it to [log crash reports,](/reference/react-dom/server/renderToReadableStream#logging-crashes-on-the-server) make sure that you still call `console.error`. + + +#### Returns {/*returns*/} + +`resume` returns a Promise: + +- If `resume` successfully produced a [shell](/reference/react-dom/server/renderToReadableStream#specifying-what-goes-into-the-shell), that Promise will resolve to a [Readable Web Stream.](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) that can be piped to a [Writable Web Stream.](https://developer.mozilla.org/en-US/docs/Web/API/WritableStream). +- If an error happens in the shell, the Promise will reject with that error. + +The returned stream has an additional property: + +* `allReady`: A Promise that resolves when all rendering is complete. You can `await stream.allReady` before returning a response [for crawlers and static generation.](/reference/react-dom/server/renderToReadableStream#waiting-for-all-content-to-load-for-crawlers-and-static-generation) If you do that, you won't get any progressive loading. The stream will contain the final HTML. + +#### Caveats {/*caveats*/} + +- `resume` does not accept options for `bootstrapScripts`, `bootstrapScriptContent`, or `bootstrapModules`. Instead, you need to pass these options to the `prerender` call that generates the `postponedState`. You can also inject bootstrap content into the writable stream manually. +- `resume` does not accept `identifierPrefix` since the prefix needs to be the same in both `prerender` and `resume`. +- Since `nonce` cannot be provided to prerender, you should only provide `nonce` to `resume` if you're not providing scripts to prerender. +- `resume` re-renders from the root until it finds a component that was not fully pre-rendered. Only fully prerendered Components (the Component and its children finished prerendering) are skipped entirely. + +## Usage {/*usage*/} + +### Resuming a prerender {/*resuming-a-prerender*/} + + + +```js src/App.js hidden +``` + +```html public/index.html + + + + + + Document + + + + + +``` + +```js src/index.js +import { + flushReadableStreamToFrame, + getUser, + Postponed, + sleep, +} from "./demo-helpers"; +import { StrictMode, Suspense, use, useEffect } from "react"; +import { prerender } from "react-dom/static"; +import { resume } from "react-dom/server"; +import { hydrateRoot } from "react-dom/client"; + +function Header() { + return
Me and my descendants can be prerendered
; +} + +const { promise: cookies, resolve: resolveCookies } = Promise.withResolvers(); + +function Main() { + const { sessionID } = use(cookies); + const user = getUser(sessionID); + + useEffect(() => { + console.log("reached interactivity!"); + }, []); + + return ( +
+ Hello, {user.name}! + +
+ ); +} + +function Shell({ children }) { + // In a real app, this is where you would put your html and body. + // We're just using tags here we can include in an existing body for demonstration purposes + return ( + + {children} + + ); +} + +function App() { + return ( + + +
+ + +
+ + + ); +} + +async function main(frame) { + // Layer 1 + const controller = new AbortController(); + const prerenderedApp = prerender(, { + signal: controller.signal, + onError(error) { + if (error instanceof Postponed) { + } else { + console.error(error); + } + }, + }); + // We're immediately aborting in a macrotask. + // Any data fetching that's not available synchronously, or in a microtask, will not have finished. + setTimeout(() => { + controller.abort(new Postponed()); + }); + + const { prelude, postponed } = await prerenderedApp; + await flushReadableStreamToFrame(prelude, frame); + + // Layer 2 + // Just waiting here for demonstration purposes. + // In a real app, the prelude and postponed state would've been serialized in Layer 1 and Layer would deserialize them. + // The prelude content could be flushed immediated as plain HTML while + // React is continuing to render from where the prerender left off. + await sleep(2000); + + // You would get the cookies from the incoming HTTP request + resolveCookies({ sessionID: "abc" }); + + const stream = await resume(, postponed); + + await flushReadableStreamToFrame(stream, frame); + + // Layer 3 + // Just waiting here for demonstration purposes. + await sleep(2000); + + hydrateRoot(frame.contentWindow.document, ); +} + +main(document.getElementById("container")); + +``` + +```js src/demo-helpers.js +export async function flushReadableStreamToFrame(readable, frame) { + const document = frame.contentWindow.document; + const decoder = new TextDecoder(); + for await (const chunk of readable) { + const partialHTML = decoder.decode(chunk); + document.write(partialHTML); + } +} + +// This doesn't need to be an error. +// You can use any other means to check if an error during prerender was +// from an intentional abort or a real error. +export class Postponed extends Error {} + +// We're just hardcoding a session here. +export function getUser(sessionID) { + return { + name: "Alice", + }; +} + +export function sleep(timeoutMS) { + return new Promise((resolve) => { + setTimeout(() => { + resolve(); + }, timeoutMS); + }); +} +``` + + + +### Further reading {/*further-reading*/} + +Resuming behaves like `renderToReadableStream`. For more examples, check out the [usage section of `renderToReadableStream`](/reference/react-dom/server/renderToReadableStream#usage). +The [usage section of `prerender`](/reference/react-dom/static/prerender#usage) includes examples of how to use `prerender` specifically. \ No newline at end of file diff --git a/src/content/reference/react-dom/server/resumeToPipeableStream.md b/src/content/reference/react-dom/server/resumeToPipeableStream.md new file mode 100644 index 00000000..48caa3be --- /dev/null +++ b/src/content/reference/react-dom/server/resumeToPipeableStream.md @@ -0,0 +1,78 @@ +--- +title: resumeToPipeableStream +--- + + + +`resumeToPipeableStream` streams a pre-rendered React tree to a pipeable [Node.js Stream.](https://nodejs.org/api/stream.html) + +```js +const {pipe, abort} = await resumeToPipeableStream(reactNode, postponedState, options?) +``` + + + + + + + +This API is specific to Node.js. Environments with [Web Streams,](https://developer.mozilla.org/en-US/docs/Web/API/Streams_API) like Deno and modern edge runtimes, should use [`resume`](/reference/react-dom/server/renderToReadableStream) instead. + + + +--- + +## Reference {/*reference*/} + +### `resumeToPipeableStream(node, postponed, options?)` {/*resume-to-pipeable-stream*/} + +Call `resume` to resume rendering a pre-rendered React tree as HTML into a [Node.js Stream.](https://nodejs.org/api/stream.html#writable-streams) + +```js +import { resume } from 'react-dom/server'; +import {getPostponedState} from './storage'; + +async function handler(request, response) { + const postponed = await getPostponedState(request); + const {pipe} = resumeToPipeableStream(, postponed, { + onShellReady: () => { + pipe(response); + } + }); +} +``` + +[See more examples below.](#usage) + +#### Parameters {/*parameters*/} + +* `reactNode`: The React node you called `prerender` with. For example, a JSX element like ``. It is expected to represent the entire document, so the `App` component should render the `` tag. +* `postponedState`: The opaque `postpone` object returned from a [prerender API](/reference/react-dom/static/index), loaded from wherever you stored it (e.g. redis, a file, or S3). +* **optional** `options`: An object with streaming options. + * **optional** `nonce`: A [`nonce`](http://developer.mozilla.org/en-US/docs/Web/HTML/Element/script#nonce) string to allow scripts for [`script-src` Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src). + * **optional** `signal`: An [abort signal](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal) that lets you [abort server rendering](#aborting-server-rendering) and render the rest on the client. + * **optional** `onError`: A callback that fires whenever there is a server error, whether [recoverable](/reference/react-dom/server/renderToReadableStream#recovering-from-errors-outside-the-shell) or [not.](/reference/react-dom/server/renderToReadableStream#recovering-from-errors-inside-the-shell) By default, this only calls `console.error`. If you override it to [log crash reports,](/reference/react-dom/server/renderToReadableStream#logging-crashes-on-the-server) make sure that you still call `console.error`. + * **optional** `onShellReady`: A callback that fires right after the [shell](#specifying-what-goes-into-the-shell) has finished. You can call `pipe` here to start streaming. React will [stream the additional content](#streaming-more-content-as-it-loads) after the shell along with the inline `