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facebook/react (react)

Below is a list of all new features, APIs, and bug fixes.

Read the React 19.2 release post for more information.

<Activity>: A new API to hide and restore the UI and internal state of its children.
useEffectEvent is a React Hook that lets you extract non-reactive logic into an Effect Event.
cacheSignal (for RSCs) lets your know when the cache() lifetime is over.
React Performance tracks appear on the Performance panel’s timeline in your browser developer tools

Added resume APIs for partial pre-rendering with Web Streams:
- resume: to resume a prerender to a stream.
- resumeAndPrerender: to resume a prerender to HTML.
Added resume APIs for partial pre-rendering with Node Streams:
- resumeToPipeableStream: to resume a prerender to a stream.
- resumeAndPrerenderToNodeStream: to resume a prerender to HTML.
Updated prerender APIs to return a postponed state that can be passed to the resume APIs.

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.
Add Node Web Streams (prerender, renderToReadableStream) to server-side-rendering APIs for Node.js
Use underscore instead of : IDs generated by useId

<Activity /> was developed over many years, starting before ClassComponent.setState (@acdlite @sebmarkbage and many others)
Stringify context as "SomeContext" instead of "SomeContext.Provider" (@kassens #33507)
Include stack of cause of React instrumentation errors with %o placeholder (@eps1lon #34198)
Fix infinite useDeferredValue loop in popstate event (@acdlite #32821)
Fix a bug when an initial value was passed to useDeferredValue (@acdlite #34376)
Fix a crash when submitting forms with Client Actions (@sebmarkbage #33055)
Hide/unhide the content of dehydrated suspense boundaries if they resuspend (@sebmarkbage #32900)
Avoid stack overflow on wide trees during Hot Reload (@sophiebits #34145)
Improve Owner and Component stacks in various places (@sebmarkbage, @eps1lon: #33629, #33724, #32735, #33723)
Add cacheSignal (@sebmarkbage #33557)

Block on Suspensey Fonts during reveal of server-side-rendered content (@sebmarkbage #33342)
Use underscore instead of : for IDs generated by useId (@sebmarkbage, @eps1lon: #32001, #33342 #33099, #33422)
Stop warning when ARIA 1.3 attributes are used (@Abdul-Omira #34264)
Allow nonce to be used on hoistable styles (@Andarist #32461)
Warn for using a React owned node as a Container if it also has text content (@sebmarkbage #32774)
s/HTML/text for for error messages if text hydration mismatches (@rickhanlonii #32763)
Fix a bug with React.use inside React.lazy-ed Component (@hi-ogawa #33941)
Enable the progressiveChunkSize option for server-side-rendering APIs (@sebmarkbage #33027)
Fix a bug with deeply nested Suspense inside Suspense fallback when server-side-rendering (@gnoff #33467)
Avoid hanging when suspending after aborting while rendering (@gnoff #34192)
Add Node Web Streams to server-side-rendering APIs for Node.js (@sebmarkbage #33475)

Preload <img> and <link> using hints before they're rendered (@sebmarkbage #34604)
Log error if production elements are rendered during development (@eps1lon #34189)
Fix a bug when returning a Temporary reference (e.g. a Client Reference) from Server Functions (@sebmarkbage #34084, @denk0403 #33761)
Pass line/column to filterStackFrame (@eps1lon #33707)
Support Async Modules in Turbopack Server References (@lubieowoce #34531)
Add support for .mjs file extension in Webpack (@jennyscript #33028)
Fix a wrong missing key warning (@unstubbable #34350)
Make console log resolve in predictable order (@sebmarkbage #33665)

createContainer and createHydrationContainer had their parameter order adjusted after on* handlers to account for upcoming experimental APIs