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📨 #231: React Labs, Compiler, React Router, Next.js, TanStack Query, c15t, RTK, Base UI | Legend List, FlashList, Versioning, Metro, ExecuTorch, Brownfield, Expo Router | TC39, Surveys, Rspack, tsdown

· 7 min read
Matthieu Gicquel
Matthieu Gicquel
Staff Engineer - Theodo
Cyril Bonaccini
Cyril Bonaccini
Staff Engineer - Theodo

Hi everyone!

Cyril and Matthieu from Theodo Apps here 👋, standing in for Seb to bring you the latest news from the React and React Native worlds.

This week, we have two exciting blog posts for the React team, and a special guest from the React core team has a message for you all!

We've also been reading quite a few interesting blog posts from the "official" blogs and the community.

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

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    📣 From the React team​

    React Labs: View Transitions, Activity, and more

    React Labs: View Transitions, Activity, and more

    The rumors you’ve heard that the React Team only cares about the server have been greatly exaggerated.

    In our React Labs post today, we shared that View Transitions and Activity are now ready to try out in our experimental channel, along with docs for each. These new features allow React running on the client to animate UI transitions, and hide and show parts of the UI as the user navigates client-side. They work with server features, but are aimed at solving problems on the client.

    We also shared updates on problem areas we’re focusing on that impact client-rendered apps including better profiling tools, automatically compiling effect dependencies, a potential IDE extension, fragment refs, and yes even a concurrent store. These are problem areas we’ve wanted to address for a while, which recent features like the React Compiler and the use API allow us to finally tackle.

    These features are still early and might change significantly before they’re ready to try. You can follow along while we build these features, and this newsletter is a great way to stay up to date. But don’t stress about learning everything - you can let us cook first.

    When we’re more confident a feature will ship, we’ll announce it on the blog and publish docs, like we’re doing today for View Transitions and Activity.

    Give the new experimental features a try, and check out the areas we’re working on in the blog post.

    -Ricky Hanlon

    ⚛️ React​

    React Compiler RC

    React Compiler RC

    The React Labs post is not the only exciting update this week! The React Compiler is also in Release Candidate, in preparation of the compiler’s stable release.

    The Babel-free builds is a welcome improvement so that we can keep using the compiler with our modern Rust tooling!

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      📱 React-Native​

      Legend List 1.0

      Legend List 1.0

      Making long lists performant is a hard problem, and React Native’s old architecture wasn’t making it any easier with it’s asynchronous layout computation. We remember Margelo abandoning their WishList project. Legend List is now in version 1.0, and promises to be even faster than FlashList, all the while handling the "hard cases": bidirectional infinite lists, varying item sizes… And it's compatible with the old arch (though less performant and with possible glitches).

      As Seb mentioned last week, there’s also a v2 of FlashList in the works, which should be easier to use (no need to specify estimatedItemSize for instance).

      Thankfully, all those copy the API of FlatList so it’s easy to switch back and forth 🙂.

      🔀 Other​

      🤭 Fun​

      React Compiler RC meme - shows a cat in a React Compiler RollerCoaster

      Evan Bacon - Coming back to Expo after spending an hour in Android Studio - Photo of Katy Perry kissing the ground after returning from her space flight

      A huge vertical screen with "package.json" deps and huge horizontall screen with "tailwind class names"

      See ya! 👋


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