Post

React 19.2 is now available! This release includes Activity, useEffectEvent, React Performance Tracks, partial pre-rendering, and more: react.dev/blog/2025/10...

<Activity> lets you break your app into “activities” that can be controlled and prioritized. It ships with 2 modes: "hidden" and "visible". When "hidden", Activity hides the children, unmounts effects, and defers all updates until React has nothing left to work on. react.dev/reference/re...

useEffectEvent allows you to create "Effect Events" to split “Event” logic out of the Effect that emits it. Similar to DOM events, Effect Events always “see” the latest props and state, so your Effect doesn't need to re-run when the values change. react.dev/learn/separa...

conceptually an Effect Event is like a block of code inside an Effect, kind of like event { … } the API is a bit of like writing the compiled output for that

the API is powerful because it completely turns off reactivity for the code inside. however, that’s also very dangerous if used all over the place because you don’t know where along the chain reactivity might disappear. the constraints prevent that

Excuse me I'm new here, but is that a bit like `useCallback` but without parameters? I feel like it could be discussed in the documentation.