"Just in time for React Conf, the React team rolled out their third major update of the year, React 19.2, which features long-awaited features like the <Activity> API and the useEffectEvent hook. This release also introduces significant improvements across rendering performance, developer experience, and server-side rendering capabilities. So, whether you've been waiting to explore these features since their experimental phase or are simply curious about how they enhance React's core functionality, you're in the right place."
"Most of the buzz centers around the Activity API, which, at a high level, is a wrapper component that allows you to efficiently hide and restore the UI and internal state of its children. At a lower level, it's an API that can hide a React subtree, unmount its effects while preserving its state, and continue rendering it with lower priority:"
React 19.2 introduces the Activity API and the useEffectEvent Hook alongside broader performance and server-side rendering improvements. The Activity API provides a boundary that hides a React subtree, unmounts its effects while preserving state, and allows lower-priority rendering and deferred updates, enabling UI parts to remain mounted but hidden. The useEffectEvent Hook separates event-like logic from reactive effects by producing callbacks that always see the latest props and state without triggering effect reruns. Additional enhancements target rendering performance, developer experience, and server-side rendering capabilities, with several other notable optimizations and hidden gems included.
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