Signals come to React-Redux

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Plus a critical Next.js fix, components to build PDFs, and a 'kawaii' UI component kit that survived a DMCA.

#​492 — September 25, 2026

Read on the Web

👋 We're taking a week off next week, so we'll be back on Friday, October 9.
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Your editor, Peter Cooper
Together with  Code Rabbit
 React Status

Rendering Huge Pull Requests in the GitHub Copilot App — GitHub's desktop Copilot app is built on React (atop Tauri), but to show PRs with 2000+ files and a million changed lines, it renders its code rows outside React. A worthwhile read if you build UIs that need to stay fast at scale, and they're upfront about the mistakes they made along the way.

Alberto Gimeno (GitHub)

Fewer Findings. Only Real Risks — AI-generated code can introduce vulnerabilities that are easy to miss in a pull request. CodeRabbit Security continuously reviews your codebase for complex bugs and security risks, using full-codebase context to follow data flows, dependencies, and patterns beyond the latest diff.

CodeRabbit sponsor

Redact: An Alternative 'Projection' of React — Back in May, Tanner Linsley explained how he’d built a synchronous, React-compatible runtime. It’s now at v0.1 with React 19.3 API support, a drop-in Vite plugin, and a useful compatibility table.

TanStack

💡 The runtime is a fraction of React's size, but the trade-off is no concurrent rendering (this Japanese blog post has a nice look into that). There's also no license yet, and it can be considered experimental.

IN BRIEF:

React-Redux 9.4 Alpha Adds Opt-In useSignalSelector — Redux runs every mounted selector on every dispatch, which gets costly in huge apps. The new opt-in, signals-based useSignalSelector tracks which state each selector reads, so a dispatch only re-runs selectors whose data changed.

Mark Erikson

💡 Alpha 0, above, has the full explainer, but Alpha 1 landed yesterday with a key bugfix and corrected benchmarks.

📄 Helix: How Shopify is Using LLMs to Move Its App Off React Native – A look behind the scenes of Shopify's recently announced migration from React Native to Swift and Kotlin. Talha Naqvi (Shopify)

📄 Props Are Not a Design System – Why arbitrary style props make every button a one-off. Robert Vitonsky

📄 AI, Open Source, and the Long Road to TanStack Charts – A look into how Tanner builds with agents now. Tanner Linsley

🛠  Code, Tools & Libraries

Playroom: Design with JSX, Powered by Your Own Component Library — A browser-based JSX playground, wired up to your own component library, that renders every theme and viewport width side by side as you edit during dev/testing. Check out this live demo.

SEEK

💡 Along similar lines, Nearform has just released v5 of React Live, a live editing experience for React components but better suited for use in docs, blog posts, etc.

pdfcn: Copy-Paste Components for Making PDFs — Takes the shadcn approach to PDF generation, with components for tables, headers, lists, and larger blocks for things like invoices and reports. Rendering is done with Takumi or Forme, both WASM-based engines that don't need a headless browser.

Aniket Pawar

loading-dev: CSS-Animated Loading Indicators for React — 29 CSS-animated loading spinners for React 19+. You set size, color and duration, and they respect reduced motion. You can customize and play with each of them too.

Jakub Krehel and Paul Faivret

  • React Native Reanimated 4.7 – Create smooth animations and interactions in React Native apps. Layout animations now run on its new engine by default.

  • gridstack.js 14.0 – The popular drag-and-drop dashboard layout library adds a list mode that reflows widgets like a reorderable list. (Demos.)

  • 😀 Frimousse 0.4 – Lightweight, unstyled emoji picker component.

  • React Three Fiber 9.8 – Now compatible with React 19.3.

📰 Classifieds

The future of mobile development is agentic. For years, mobile shipped slower than the web. Now, agents are coding/testing/shipping all on Expo.

🐻 Build apps, not walls — for the AI era. Learn from library authors, core teams & top engineers. See you in Berlin & online, Dec 4 & 7!

Build products that help people build their lives - Fidelity technologists can change the way our clients invest - for the better and for everyone.

And finally…

Animal Island UI: A 'Kawaii' React Component Library — Originally based on Animal Crossing imagery (for which Nintendo issued a DMCA takedown) but now with its own assets and MIT licensed. The site’s in Chinese but it's easy to browse the components, and the GitHub README is in English.

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