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19.2 changelog (#34655)
Co-authored-by: Jack Pope <jackpope1@gmail.com> Co-authored-by: Rick Hanlon <rickhanlonii@meta.com>
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CHANGELOG.md
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CHANGELOG.md
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## 19.2.0 (October 1st, 2025)
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Below is a list of all new features, APIs, and bug fixes.
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Read the [React 19.2 release post](https://react.dev/blog/2025/10/01/react-19-2) for more information.
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### New React Features
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- [`<Activity>`](https://react.dev/reference/react/Activity): A new API to hide and restore the UI and internal state of its children.
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- [`useEffectEvent`](https://react.dev/reference/react/useEffectEvent) is a React Hook that lets you extract non-reactive logic into an [Effect Event](https://react.dev/learn/separating-events-from-effects#declaring-an-effect-event).
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- [`cacheSignal`](https://react.dev/reference/react/cacheSignal) (for RSCs) lets your know when the `cache()` lifetime is over.
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- [React Performance tracks](https://react.dev/reference/developer-tooling/react-performance-tracks) appear on the Performance panel’s timeline in your browser developer tools
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### New React DOM Features
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- Added resume APIs for partial pre-rendering with Web Streams:
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- [`resume`](https://react.dev/reference/react-dom/server/resume): to resume a prerender to a stream.
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- [`resumeAndPrerender`](https://react.dev/reference/react-dom/static/resumeAndPrerender): to resume a prerender to HTML.
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- Added resume APIs for partial pre-rendering with Node Streams:
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- [`resumeToPipeableStream`](https://react.dev/reference/react-dom/server/resumeToPipeableStream): to resume a prerender to a stream.
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- [`resumeAndPrerenderToNodeStream`](https://react.dev/reference/react-dom/static/resumeAndPrerenderToNodeStream): to resume a prerender to HTML.
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- Updated [`prerender`](https://react.dev/reference/react-dom/static/prerender) APIs to return a `postponed` state that can be passed to the `resume` APIs.
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### Notable changes
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- React DOM now batches suspense boundary reveals, matching the behavior of client side rendering. This change is especially noticeable when animating the reveal of Suspense boundaries e.g. with the upcoming `<ViewTransition>` Component. React will batch as much reveals as possible before the first paint while trying to hit popular first-contentful paint metrics.
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- Add Node Web Streams (`prerender`, `renderToReadableStream`) to server-side-rendering APIs for Node.js
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- Use underscore instead of `:` IDs generated by useId
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### All Changes
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#### React
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- `<Activity />` was developed over many years, starting before `ClassComponent.setState` (@acdlite @sebmarkbage and many others)
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- Stringify context as "SomeContext" instead of "SomeContext.Provider" (@kassens [#33507](https://github.com/facebook/react/pull/33507))
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- Include stack of cause of React instrumentation errors with `%o` placeholder (@eps1lon [#34198](https://github.com/facebook/react/pull/34198))
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- Fix infinite `useDeferredValue` loop in popstate event (@acdlite [#32821](https://github.com/facebook/react/pull/32821))
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- Fix a bug when an initial value was passed to `useDeferredValue` (@acdlite [#34376](https://github.com/facebook/react/pull/34376))
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- Fix a crash when submitting forms with Client Actions (@sebmarkbage [#33055](https://github.com/facebook/react/pull/33055))
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- Hide/unhide the content of dehydrated suspense boundaries if they resuspend (@sebmarkbage [#32900](https://github.com/facebook/react/pull/32900))
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- Avoid stack overflow on wide trees during Hot Reload (@sophiebits [#34145](https://github.com/facebook/react/pull/34145))
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- Improve Owner and Component stacks in various places (@sebmarkbage, @eps1lon: [#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))
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- Add `cacheSignal` (@sebmarkbage [#33557](https://github.com/facebook/react/pull/33557))
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#### React DOM
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- Block on Suspensey Fonts during reveal of server-side-rendered content (@sebmarkbage [#33342](https://github.com/facebook/react/pull/33342))
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- Use underscore instead of `:` for IDs generated by `useId` (@sebmarkbage, @eps1lon: [#32001](https://github.com/facebook/react/pull/32001), [https://github.com/facebook/react/pull/33342](https://github.com/facebook/react/pull/33342)[#33099](https://github.com/facebook/react/pull/33099), [#33422](https://github.com/facebook/react/pull/33422))
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- Stop warning when ARIA 1.3 attributes are used (@Abdul-Omira [#34264](https://github.com/facebook/react/pull/34264))
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- Allow `nonce` to be used on hoistable styles (@Andarist [#32461](https://github.com/facebook/react/pull/32461))
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- Warn for using a React owned node as a Container if it also has text content (@sebmarkbage [#32774](https://github.com/facebook/react/pull/32774))
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- s/HTML/text for for error messages if text hydration mismatches (@rickhanlonii [#32763](https://github.com/facebook/react/pull/32763))
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- Fix a bug with `React.use` inside `React.lazy`\-ed Component (@hi-ogawa [#33941](https://github.com/facebook/react/pull/33941))
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- Enable the `progressiveChunkSize` option for server-side-rendering APIs (@sebmarkbage [#33027](https://github.com/facebook/react/pull/33027))
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- Fix a bug with deeply nested Suspense inside Suspense fallback when server-side-rendering (@gnoff [#33467](https://github.com/facebook/react/pull/33467))
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- Avoid hanging when suspending after aborting while rendering (@gnoff [#34192](https://github.com/facebook/react/pull/34192))
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- Add Node Web Streams to server-side-rendering APIs for Node.js (@sebmarkbage [#33475](https://github.com/facebook/react/pull/33475))
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#### React Server Components
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- Preload `<img>` and `<link>` using hints before they're rendered (@sebmarkbage [#34604](https://github.com/facebook/react/pull/34604))
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- Log error if production elements are rendered during development (@eps1lon [#34189](https://github.com/facebook/react/pull/34189))
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- Fix a bug when returning a Temporary reference (e.g. a Client Reference) from Server Functions (@sebmarkbage [#34084](https://github.com/facebook/react/pull/34084), @denk0403 [#33761](https://github.com/facebook/react/pull/33761))
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- Pass line/column to `filterStackFrame` (@eps1lon [#33707](https://github.com/facebook/react/pull/33707))
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- Support Async Modules in Turbopack Server References (@lubieowoce [#34531](https://github.com/facebook/react/pull/34531))
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- Add support for .mjs file extension in Webpack (@jennyscript [#33028](https://github.com/facebook/react/pull/33028))
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- Fix a wrong missing key warning (@unstubbable [#34350](https://github.com/facebook/react/pull/34350))
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- Make console log resolve in predictable order (@sebmarkbage [#33665](https://github.com/facebook/react/pull/33665))
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#### React Reconciler
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- [createContainer](https://github.com/facebook/react/blob/v19.2.0/packages/react-reconciler/src/ReactFiberReconciler.js#L255-L261) and [createHydrationContainer](https://github.com/facebook/react/blob/v19.2.0/packages/react-reconciler/src/ReactFiberReconciler.js#L305-L312) had their parameter order adjusted after `on*` handlers to account for upcoming experimental APIs
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## 19.1.1 (July 28, 2025)
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### React
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## 6.1.0
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**Note:** Version 6.0.0 was mistakenly released and immediately deprecated and untagged on npm. This is the first official 6.x major release and includes breaking changes.
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- **Breaking:** Require Node.js 18 or newer. ([@michaelfaith](https://github.com/michaelfaith) in [#32458](https://github.com/facebook/react/pull/32458))
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- **Breaking:** Flat config is now the default `recommended` preset. Legacy config moved to `recommended-legacy`. ([@michaelfaith](https://github.com/michaelfaith) in [#32457](https://github.com/facebook/react/pull/32457))
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- **New Violations:** Disallow calling `use` within try/catch blocks. ([@poteto](https://github.com/poteto) in [#34040](https://github.com/facebook/react/pull/34040))
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- **New Violations:** Disallow calling `useEffectEvent` functions in arbitrary closures. ([@jbrown215](https://github.com/jbrown215) in [#33544](https://github.com/facebook/react/pull/33544))
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- Handle `React.useEffect` in addition to `useEffect` in rules-of-hooks. ([@Ayc0](https://github.com/Ayc0) in [#34076](https://github.com/facebook/react/pull/34076))
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- Added `react-hooks` settings config option that to accept `additionalEffectHooks` that are used across exhaustive-deps and rules-of-hooks rules. ([@jbrown215](https://github.com/jbrown215)) in [#34497](https://github.com/facebook/react/pull/34497)
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## 6.0.0
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Accidentally released. See 6.1.0 for the actual changes.
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## 5.2.0
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- Support flat config ([@michaelfaith](https://github.com/michaelfaith) in [#30774](https://github.com/facebook/react/pull/30774))
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