This week was huge for web dev 🚀.

React 19.2 just landed with fixes for some of the most annoying bugs, Sonnet 4.5 dropped with major AI upgrades, and the ecosystem feels like it’s moving faster than ever.

I’ve rounded up the highlights (and why they matter) along with this week’s Snack for you below 👇

But before that, let's hear it from our Sponsor.

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Ever add a handler inside an effect, put it in the dependency array, and suddenly… re-renders forever?

That’s usually because your handler changes identity every render, so the effect keeps tearing down and setting up again.

React 19.2 just dropped useEffectEvent that fixes this problem.

useEffectEvent solves this by:

• Giving you a stable function identity (so the effect doesn’t re-run).
• Still letting that function “see” the latest theme value whenever it runs.

So the connection only resets when roomId changes (which is what we want), but the toast still shows the correct, latest theme (no staleness).

👉 Takeaway: Use useEffectEvent when you need event handlers inside effects that stay up to date without messing up your dependency array.

​Where it's AT? Dan Abramov deep dives into the AT Protocol

​React 19.2 just dropped some of the most exciting changes with new features and performance improvements:

• Activity component
• useEffectEvent
• cacheSignal

A full React 19.2 video deep dive is here

​Sonnet 4.5 is out! Claude Sonnet 4.5 is the best coding model in the world.

​Next.js Middleware file will be renamed to Proxy, are you ready for it?

React Router's preview support for RSC Framework Mode is now available. Just swap your Vite plugin and you can:

• Return Server Components from loaders/actions
• Opt routes into Server Components
• Leverage Server Functions

Auth.js aka Next Auth is now part of Better Auth, isn't that amazing? It's time to refactor Modern Full Stack Next.js Course!​

There is a Coding Agent Template for building AI-powered Agents

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