React

Summary

Fixed missing FormData entries in Server Actions.

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Docs now explain more cases where compiler adoption should be incremental.

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Enhanced type safety (hardening) for React Server Components.

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Strengthen type safety for React Server Components.

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Hardens TypeScript types for React Server Components.

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Restores the component hook factories rule removed in version 7.1.0, fixing configuration errors.

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Add ESLint v10 support and improve compiler diagnostics with full error reporting and better source locations.

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Added additional cycle protection to React Server Components

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Added extra cycle protections to React Server Components

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Added additional cycle protection to React Server Components

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Added DoS mitigation layers to Server Actions

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Add DoS mitigations to Server Actions to reduce attack surface.

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Add additional DoS mitigations to Server Actions

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Add extra loop protection to React Server Functions

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Added extra loop protection for React Server Functions to prevent infinite loops during execution.

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Add extra loop protection to React Server Functions to prevent infinite loops

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Fixes promise cycle handling in React Server Components

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Relocated react-server-dom-webpack/.unbundled to a private react-server-dom-unbundled package.

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Migrated React Server DOM webpack/.unbundled to a private `react-server-dom-unbundled` package.

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Added React Server Component updates that fix issues with Server Actions.

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Adds fixes for React Server Components within Server Actions

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Fix React Server Component issues affecting Server Actions

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Introduces new React APIs: <Activity> for UI state hide/restore, useEffectEvent hook, cacheSignal for server components, and resume APIs for partial pre‑rendering with Web and Node streams.

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Fixed Owner Stacks to work with ES2015 function.name semantics.

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- Introduced the dev‑only `captureOwnerStack` API, updated `useId` format, added dev warnings and removed `React.act` from production builds.

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- Introduces React Actions with async support, new hooks (useActionState, useOptimistic, use) and ref‑as‑prop, plus enhanced Suspense pre‑warming, form actions, metadata, stylesheet and async‑script handling, and resource preloading APIs.

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Enforce component names to start with an uppercase letter, breaking previous lowercase allowance.

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Imported from changelog source; review and generate a concise summary before publishing.

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Added warnings for numerous deprecated APIs (findDOMNode, legacy context, string refs, defaultProps in function components, etc.) to aid React 19 migration.

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Added component stack argument to onRecoverableError and propagated server error info to the client

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Fixed multiple React DOM bugs: false positive warnings, production suppressHydrationWarning, double componentWillUnmount in Suspense, transition updates, infinite loop in useDeferredValue, throttled Suspense fallbacks, props object consi...

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Introduces new concurrent hooks (useId, useTransition/useDeferredValue, useSyncExternalStore, useInsertionEffect) and ReactDOM client APIs (createRoot, hydrateRoot) plus streaming server render APIs.

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Removed an unused dependency in React DOM to address the SharedArrayBuffer cross‑origin isolation warning.

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Fix crash in IE11 for React DOM

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Release React 17 with new JSX transform via react/jsx-runtime and updated event handling (delegation, removal of pooling, focusin/out usage).

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Add support for the new JSX transform in React

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Added backport support for React's new JSX transform to the 0.14.x branch

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Added backport of the new JSX transform to React 15.x.

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Fix bug where effect cleanup functions were not called in legacy mode Suspense, affecting users relying on Suspense for data fetching.

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Deprecate React.createFactory() and unstable createPortal, and add warnings for string refs, style collisions, and misuse of ReactDOM.createRoot in Concurrent Mode.

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Fixed passive effect (useEffect) not firing in multi‑root applications

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Fix duplicate mouseenter events in nested React containers.

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Fix regression in react‑native‑web by restoring the correct argument order in React DOM event plugin extractors

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Fix regression in Next.js apps where Suspense mismatches during hydration caused errors.

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Fix edge case where a hook update wasn't memoized and improve hydration heuristic to prevent incorrect updates.

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Add <React.Profiler> API and several DevTools capabilities (editing useState, toggling Suspense, async act support, nested act warnings).

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Fix incorrect bailout behavior in useReducer()

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Fixed select elements with a size attribute from incorrectly selecting the first option.

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Imported from changelog source; review and generate a concise summary before publishing.

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Fix UMD build input handling bug and render-phase update discard issue in React DOM

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Fix multiple ReactDOM and hook bugs: render ignored in useEffect, empty portal unmount crash, useImperativeHandle without deps, SVG crossOrigin attribute, and false‑positive Suspense warnings.

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Fix a crash when React DOM and React Test Renderer are used together with older React versions

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Introduce Hooks API (useState, useEffect, useReducer, etc.) with ESLint plugin support for hook linting

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Fix performance of React.lazy for many components and resolve profiling mode regression

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Fixed several bugs in Suspense, lazy loading, and Profiler interaction.

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Fix several Suspense bugs – fallback no longer remounts on each promise resolution, fallback stays hidden after load, and IE11 crash resolved

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Add new APIs: React.memo, React.lazy, getDerivedStateFromError, contextType and server‑side support for memo and contextType; plus StrictMode warnings for legacy context API, findDOMNode, and improper <Context> usage.

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Fixed a recent iframe regression and stopped unnecessary textarea re‑renders when data is unchanged

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Imported from changelog source; review and generate a concise summary before publishing.

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Added React DevTools Profiler support and a new warning for React.forwardRef argument count.

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Fixed XSS vulnerability (CVE‑2018‑6341) affecting attribute names across multiple 16.x minor versions.

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Added propTypes support for components returned by React.ForwardRef and allowed multiple root children in the test renderer API.

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Added experimental React.unstable_Profiler component, Pointer Events support in React DOM, and propTypes on context provider components.

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Enhanced error messages for null/undefined in cloneElement and improved component type casing warnings.

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Fixed several development‑mode issues: false‑positive IE11 Fragment warning, performance regression, error‑handling bugs, and ensured getDerivedStateFromProps is applied correctly.

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Introduce new officially supported Context API, React.createRef, React.forwardRef, and StrictMode to aid async rendering

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Add Fragment as a named export and support experimental Call/Return types in React.Children utilities.

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Switch all packages from BSD+Patents to MIT license.

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Added support for string values in the capture attribute and prevented emitting autoFocus={false} on the server, while removing a freeze on the ReactDOMServer public API.

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Discontinue Bower releases; use npm or unpkg for UMD builds.

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Introduces error boundaries, support for returning arrays/strings from render, portals, and streaming server‑side rendering APIs.

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Fixed a crash on iOS Safari in React DOM.

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Added deprecation warnings for legacy React APIs (createClass, DOM factories, createMixin) and switched warnings to console.warn.

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Updated prop-types version to fix a critical bug in React Addons.

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Fixed React Addons createFragment export to correctly expose the intended functionality

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Deprecated due to a critical issue; upgrade to v15.5.4+

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Release deprecated due to a critical issue; users should upgrade to v15.5.4 or newer.

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Added deprecation warnings for React.createClass and React.PropTypes; marked React Addons as deprecated and removed their peerDependencies.

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Fixed build issues across bundlers (Brunch, RequireJS, SystemJS) and cleaned up dead code and warnings.

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Restructured variable assignment to avoid a Rollup bug in React

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React and browser builds no longer bundle React DOM; added detailed PropTypes null/undefined messages and new warnings for invalid aria attributes and misuse of autofocus

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Added new HTML attributes (playsInline, as) and error‑boundary support in the test renderer

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Improved performance of development builds, internal hooks, fbjs upgrade, and faster startup in Node

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Introduce React.PureComponent as a new base class and add numerous developer warnings (props.children modification, undefined mixins, PropTypes misuse, Maps as children, etc.).

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Fixed numerous warnings and regressions across React core, DOM, native, and Perf (e.g., missing element warning, null input stack trace, context update, server‑rendering errors, input attribute bugs, spurious unknown‑property warnings).

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Added production error codes with links and enhanced warning messages, including component stack info for PropTypes, key warnings, and unknown DOM property warnings.

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Updated internal Object.assign usage and added a warning that props passed to createElement must be plain objects.

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Removed extraneous files from the npm package and bundled React Native renderer files inside it.

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Restore React spread API, now officially deprecated

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Switch to document.createElement for initial rendering, removing data‑reactid, extra <span> wrappers and rendering null as comment nodes – improves performance and changes DOM output.

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Fixed memory leak in server-side React rendering

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Fixed multiple bugs: option tag rendering with dangerouslySetInnerHTML, a memory leak in the synthetic event system, and setState calls in componentWillMount during shallow rendering.

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Adjusted autoCapitalize and autoCorrect to be applied as DOM attributes for improved cross‑browser compatibility

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Updated internal React implementation for improved compatibility with React Native.

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Updated fbjs dependency in React to fix handling of undefined document

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Added nonce support for <script>/<style> and reversed attribute for <ol> in React DOM

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Fixed several development‑build bugs affecting event handling and ES5 shims in older IE/Edge.

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Fixed bugs affecting event handling in old browsers, dangerouslySetInnerHTML with Closure Compiler, zero timeout values, SVG class selection, and legacy .props updates; added react‑dom.js to Bower main for tooling compatibility

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Split core library into `react` and `react-dom` packages, requiring `ReactDOM.render` instead of `React.render` (breaking API change).

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Added clipPath element and attribute support for SVG rendering.