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📨 #252: React 19.2, Activity, useEffectEvent, Compiler, Astro, StyleX, Docusaurus | Vega OS, Voltra, NativeScript, Expo Router, NativeWind, Lynx, Maestro | TC39, Temporal, Baseline, State Of JS, Supply Chain, MCP

· 8 minutes de lecture
Sébastien Lorber
Sébastien Lorber
Newsletter creator - Docusaurus maintainer
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Hi everyone!

Wondering why the newsletter is late this week?
Well, we had good reasons!

React v19.2 has just been released with the highly anticipated <Activity> component, useEffectEvent hook, and more!

React Native also had exciting updates, notably an OS from Amazon with first-class React Native support, and upcoming solutions to integrate even more tightly with native platforms.

Don't forget that React Conf starts next week, on October 7. The schedule is online, full of interesting talks, and we can expect more exciting announcements!

As always, thanks for supporting us on your favorite platform:

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    React 19.2

    React 19.2

    Just in time before React Conf, React 19.2 is out with several new features and improvements:

    • <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.
    • cacheSignal() returns a signal that triggers when React.cache() lifetime is over, letting you abort tasks in RSCs.
    • Performance Tracks helps you profile your app in Chrome DevTools. The Scheduler track shows React splits your code into different priorities. The Component track shows when a component renders and how long it takes.
    • prerender() and resume() enables you to implement Partial Pre-Rendering. You can now pre-render the static parts of your app at build time, then resume rendering to complete the dynamic parts.
    • eslint-plugin-react-hooks v6 with flat config by default and opt-in for React Compiler powered rules.

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      See ya! 👋


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