"<Activity> is to me the most exciting feature. It can hide a React subtree and unmount its effects while preserving its state, and keep rendering it with lower priority. It unlocks very exciting pre-rendering patterns along the way! More Activity modes are coming. useEffectEvent(callback) always sees the latest props and state, helping avoid the stale closure problem. Effect Events should only be called from Effects and can be omitted in the dependency array."
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React 19.2 introduces several features and improvements. The <Activity> component can hide a React subtree, unmount its effects while preserving its state, and continue rendering it with lower priority, enabling pre-rendering patterns and promising more Activity modes. useEffectEvent(callback) always sees the latest props and state, preventing stale closures; effect events must be called from effects and can be omitted from dependency arrays. cacheSignal() returns a signal when React.cache() lifetime ends, enabling task abortion in React Server Components. React Native updates include an Amazon OS with first-class React Native support and upcoming tighter native integration solutions. React Conf starts October 7.
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