This Week In React 176
UseActionState, React Compiler, Million Lint, TanStack, Generative UI, Vinxi, Remix i18n, Next.js security, Typesafe Router, Shopify RN perf, RCTRootViewFactory, iOS Live Activities, Uni Stack, TypeSc
Hi everyone!
This week is difficult to sum up, there's a lot of interesting news and I don't know which to highlight.
We notably have a sneak peek of a new React core hook replacing the confusing useFormState, that even React Native devs will now be able to use now!
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⚛️ React
React Core PR - New useActionState hook
It turns out the useFormState hook was confusing, and not even meant to be solely used in forms. The React team is addressing this by introducing a new React core hook to replace it:
Renames
useFormStatetouseActionStateAdds a pending state to the returned tuple
Moves the hook to the
reactpackage
Moving it from react-dom to react also means that now, other renderers such as React Native can use it too. There are other benefits to look at, such as a “partial progressive enhancement” feature, but also new caveats documented in the PR.
🐦 React 19 != React Compiler: The React Labs post is a bit ambiguous and misled many of us, so let’s clarify. The compiler will likely come after the React 19.0 release as a separate project, and there’s a good chance it will initially be released as a Babel/TypeScript plugin. The internals are decoupled through, so it shouldn’t take long to adapt it it to Rust.
🐦 TanStack Start preview: Tanner works on a TanStack Start full-stack framework based on Vinxi and TanStack Router. This preview shows he’s migrating his own TanStack site to it.
📜 Vercel - Introducing AI SDK 3.0 with Generative UI support: With the AI SDK 3.0 and thanks to React Server Components, you can now stream UI components directly from LLMs. Super impressive demos!
📜 Secure statically rendered paid content in Next.js (with the App Router): Shows that using Next.js layouts for authentication is not super secure, and the protected content can still leak through the RSC endpoint. Suggests using a middleware instead.
📜 Internationalization with Remix: Goes back to i18n fundamentals, and then detail various i18n solutions you can set up within Remix. Optional route segments can help you use localized sub-directories.
📜 Did you know you can write your own typesafe React router in 500 lines?: A great comprehensive article that might give you a better understanding of how existing routers work. Also great to learn about advanced TypeScript type-level programming techniques.
📜 Streaming HTML out of order without JavaScript: This super interesting demo shows we don’t need JavaScript to stream out-of-order HTML chunks, and yet render them in the correct order. All you need is Declarative Shadow DOM and slots. It will be interesting to see if RSC streaming + Suspense could leverage that technique in the future instead of inlining JavaScript.
📜 Simple RSC With Vinxi: The Vinxi SDK helps you create your own full-stack framework, and it even has a plugin for React Server Components support!
📜 Million.js - Blocks with noSlot Mode: the Million compiler might wrap your components with
<slot>elements, which might cause issues (styling). This introduces a new experimentalnoSlotmode..📜 How to add Monaco to a Next.js app to enable custom user workflows: Interesting tutorial that also shows how to deploy untrusted user code to Deno.
📜 Conceptual Model of React and RSC: Reflects around the UI=f(state) formula in interesting ways, and concludes RSC kind of breaks the original model.
📜 Why React Server Components Are Breaking Builds to Win Tomorrow
📦 Million Lint - public beta: A VSCode extension that helps you keep your React code fast thanks to dynamic analysis. Much simpler to use than React Devtools flame graphs. There will be an additional AI-based Lint++ paid service built on top to suggest you possible performance improvements.
📦 react-unforget - A compiler for automatic optimization of React apps: After Forgetti, this is another new alternative React compiler coming from the community. See also 🐦 Joe Savona’s feedback.
📦 Storybook 8.0 RC - v8 is officially stable enough to be used in production
📦 Onborda - Onboarding wizard flow for Next.js powered by Framer Motion
📦 UVCanvas - React component library for beautifully shaded canvas
🎥 Jack Herrington - Is Tanstack Router Better Than React-Router?
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📱 React-Native
This section is now co-authored with Benedikt. Feel free to send us your comments by email or on Twitter!
Improving Shopify App’s Performance
Shopify has been a proponent of React Native for a long time. But they did notice their app performance go down since they migrated to React Native. Instead of blaming the tech stack, they got to work and started optimizing for performance. The results speak for themselves: App launch is 44 % faster and screen load times were reduced by 59 %. Here’s a quick summary of some of the measures they took (hint: FlashList plays a big role in some of these). For details, read their great summary post:
Initially, only render what’s visible on the screen (especially true for the home screen)
Build all screens as lists (based on FlashList)
Use inlineRequires
Batch state changes
Optimize caching
Very interesting insights and impressive results. I hope the Shopify team keeps sharing these details and maybe we’ll even see some of the things they mentioned they built during this process ending up as Open Source?
👀 PR - RCTRootViewFactory: Simplifies brownfield integrations on iOS and spares you from worrying about Old Arch/New Arch/Bridge/Bridgeless combinations.
📜 Expo - Orchestrate advanced workflows with custom builds: Custom builds allow you to run scripts (bash or JS) before or after Expo builds, for example to run E2E tests, send notifications to your team, …
📜 iOS Live Activities and React Native - leveraging the latest iOS features to display your app's most current data without needing to open it: Way more apps should have Live Activities! There is a hurdle for RN devs though, because they need to be written in Swift. This 3-part series walks through all the steps required to add a Live Activity.
📜 React Native Error Boundaries - Feature, Partial, and Server: Error boundaries remain an underutilized feature, and every React Native app should have at least one (but ideally more). This post explains why and how.
🎙️ RNR 290 - The State of React Native survey with Bartłomiej Bukowski
🎙️ Rocket Ship 32 - From broke Teacher to Software Engineer with Zach Taylor
🎥 notJust Dev - Build Your Own Blog with React Native (for Web & Mobile)
🔀 Other
💬 TypeScript 5.5 Iteration Plan - new Set methods, config extension merging
📜 OpenJS Launches New Collaboration to Improve Interoperability of JavaScript Package Metadata
📜 Open Web Advocacy - Apple backs off killing web apps, but the fight continues
📦 WebKit Features in Safari 17.44 - CSS @scope, align-content
📦 Parcel 2.12 - Macros defined with import attributes running at build times
🤭 Fun
See ya! 👋