📨 #245: TanStack, React Core, Next.js MCP, RSC, memo, Remix, Base UI, React Aria | Precompiled iOS, Rozenite, AI, Perf, Nitro, BottomSheet, Tinybase | TC39, TypeScript, Runtimes, Mocks

July 30, 2025 · 9 min read

Newsletter creator - Docusaurus maintainer

Hi everyone!

This week, we have a few interesting React releases, many of them from the TanStack ecosystem. I also found great articles and interesting PRs to look at.

On the React Native side, reducing iOS build times will be a very welcome improvement, and Rozenite could significantly improve the React Native DX too!

A TC39 meeting is in progress, and I’ve also heard TS 5.9 and Node 22.18 (the first LTS to unflag type stripping) are both around the corner!

The newsletter will be taking a well-deserved 2-week break 🏝️
We'll be back on August 20. Until then, keep Reacting ✌️

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

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Addy OsmaniHead of Chrome DX - Google

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⚛️ React

Stop Re-Rendering — TanStack DB, the Embedded Client Database for TanStack Query

TanStack DB 0.1 is out in beta, 🐦 completing the vision Tanner Linsley had for React Quey from day 1. Unlike Query, which treats data as isolated cache entries, DB provides the missing reactive layer and lets you create relationships between collections, using differential dataflow — a technique that only recomputes the parts of queries that actually changed. TanStack DB was designed from the ground up to support sync engines, but it is incrementally adoptable and compatible with REST, GraphQL or anything else.

💸 The Road to Next - Master Full-Stack Web Development with Next.js 15 and React 19
👀 React Core PR - Deprecate "Throw a Promise" technique: This old technique to trigger Suspense boundaries should be deprecated and emit a warning in an upcoming release. You’d rather migrate your code to React.use(promise) instead. Maintainers of libraries like React Query wonder how to support both React v18 and v19.
👀 React Core PR - Expose cacheSignal(): According to newly merged typedefs, an upcoming React canary could expose a way to retrieve an AbortSignal that triggers at the end of the React.cache() lifetime, letting you abort any outstanding network requests.
👀 Next.js PR - Initial MCP implementation: Starting 15.4.2-canary.16, next dev can expose an MCP server if you use Turbopack and provide a NEXT_EXPERIMENTAL_MCP_SECRET env variable. Tools enable querying the module graph, entry points, and issues reported on routes.
📅 Next.js Conf - San Francisco - Oct 23, 2025 - The CFP is now open
📜 The Useless useCallback: Shows how easy it is to inadvertently break your React.memo optimizations and your useEffect behavior due to referential stability issues. IMO, React optimizations should be encapsulated; they shouldn't depend on how a component/hook is used to work, but it’s easier said than done.
📜 How Parcel bundles React Server Components: Great overview of how a bundler like Parcel works, and how it splits code and preloads it efficiently in an RSC setup depending on dynamic imports and `use client` directives.
📜 We’ve moved from TanStack Start to Next.js: It’s a product changelog entry, but you’ll find more interesting discussions on X.
📜 Let's Write React Hooks From Scratch
📜 Component Test with Storybook and Vitest
💸 Add DOCX editing to your React app with Apryse WebViewer - no office or server setup needed, just fast, native in-browser editing
📦 React 19.1.1 - Bugfix release
📦 Remix 2.17 - Redirect users to create-react-router instead of create-remix: Remix v2 is now in maintenance mode, and the init CLI prevents the creation of Remix v2 apps in favor of React Router apps.
📦 TanStack Router 1.130 - Add disableGlobalCatchBoundary option: This lets errors bubble up, useful for tests or error reporting.
📦 TanStack Form 1.15 - New withFieldGroup API
📦 React Hook Form 7.61 - New compute prop for useWatch() subscription
📦 Int 6.1 - React CLI renderer - Add backgroundColor support to Box component
📦 React Aria - July 22 Release - Infinite scrolling, automatic form reset, support additional DOM events/attributes
📦 Base UI 1.0 beta.2: The library makes progress as a serious Radix UI alternative (Next.js DevTools even adopted it).
📦 Satori 0.16 - Convert JSX to SVG - Upgrades Yoga layout engine, supports more CSS rules
📦 Preact 10.27 - Add ref callback cleanup function to typedefs

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One of the few things I regularly read to keep up with the React world.

Theo BrowneFounder of ping.gg - Youtuber

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📱 React-Native

Precompiled React Native for iOS: Faster builds are coming in 0.81

iOS React Native builds are about to become much faster. With 0.81, it will be possible to use precompiled versions of React Native and its dependencies, similarly to what is already done on Android. For now, it’s behind an opt-in flag in 0.81. But Expo 54, at the end of August, will use precompiled versions by default.

The result is impressive, reducing the build time of the RNTester app by 10x. On a larger application such as Expo Go, results are more modest, with a ~37% improvement. Expo is not yet precompiling its Expo Modules, so we can expect Expo Go and real world Expo apps to build much faster soon. Third-party lib authors will also be encouraged to ship prebuilt versions.