Wow, 300 issues already! Time flies, and thanks for reading along 🙏

It's a big week, with major releases from the Next.js and TanStack teams. We also put the spotlight on recent React Foundation activity.

On mobile, Skia 3.0 is out! Shopify and Coinbase both recently announced moving away from React Native, a trend worth watching. Callstack officially launched an AI model specialized in React Native.

There are other exciting releases to dig into, including e2e, Effect v4, and Remix v3.

Let's dive in!

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

• 🦋 Bluesky
• ✖️ X / Twitter
• 👔 LinkedIn
• 👽 Reddit

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⚛️ React​

Next.js 16.4

Cache Components are reaching maturity and are now recommended for every Next.js app. The new programming model is enabled by default in create-next-app, and will become the default in v17. Partial Prefetching is now considered part of the model.

Alongside this milestone, this release introduces:

• Static guarantees: export const ensureStatic fails the build if dynamic content sneaks into a route.
• Prefetching control: await navigation() excludes content from a prefetch.
• Agent-guided upgrades and feedback.
• React 19.3: stable View Transitions, Fragment Refs, browser() API.
• Many DX, Turbopack, bundle size and React Compiler improvements.

TanStack Charts 1.0

The new TanStack charting library is officially stable. Small bundles, fast updates, composable, type-safe. Similar to other TanStack libraries, it comes with a framework-agnostic core and a React Adapter.

Speaking of TanStack, see also 𝕏 TanStack Markdown + Highlight 1.0: a tiny, fast Markdown renderer for docs and AI streams, with its companion syntax highlighter. Framework-agnostic, comes with a <Markdown> component.

React Foundation news

We haven’t heard much of the React Foundation since the launch of its website in June, but that is likely to change in light of recent activity:

• 🐦 Barbara Markiewicz joined the React Foundation as our Director of Community - Formerly at Callstack, she organized events such as React Conf and React Universe Conf.
• 📅 React Foundation Contributors Summit - 10–12 Nov 2026, London - A React Foundation gathering is scheduled next month at Meta's King's Cross office in London. Invite-only, but ecosystem contributors can self-apply.
• 📅 React Conf Ghana - 4–5 Nov 2026, Accra - As far as I know, it’s the first React conference officially organized by the React Foundation.

• 💸 Testing Frontend - Lessons from over a million lines of TypeScript at Palantir - Skip component tests and let Meticulous do the rest
• 👀 Next.js PR - unstable_paramMatching API - Configure matching separately from build-time prerenders
• 🔐 TanStack Start security update: CVE-2026-102989 - Fixing a 9.3 XSS vulnerability.
• 📜 Making React Context Cheap with React Compiler - How to work around the lack of context selectors in React in various ways. Benchmarking 5,000 <input type=”radio”> connected to the same state, showing that the React Compiler already achieves benefits similar to context selectors.
• 📜 React's New browser API: Rendering Components Only in the Browser
• 📦 Ink 8.0 - React CLI renderer - React 19.3+, scrollable Box views, any Node stream for stdio, many rendering fixes
• 📦 Streamdown 2.7 - AI Markdown streaming renderer - Faster, incremental code highlighting, block reuse, non-blocking Mermaid
• 📦 stableref 0.2 - Type-level referential stability for React/Preact - Export branded useSyncExternalStore
• 📦 Medula - Headless devtools for agents, based on Devframes, React and Next.js support
• 📦 Shaders - WebGPU effects as components for React, Vue, Svelte, Solid and JavaScript
• 📦 Klipp - Camera toolkit for the web, comes with React Three Fiber bindings

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📱 React-Native​

🎥 React Native Skia 3.0 - Hello Graphite

William Candillon just shipped the biggest release of React Native Skia to date!

Version 3.0 is rebuilt on Skia Graphite, Skia's new backend for modern GPU APIs. The old OpenGL-centric design came with stability and performance pains. Graphite fixes both. And because its design is symmetric with WebGPU, Skia and the rest of the web ecosystem can now run together on the same GPU.

Here's what that brings:

• Multi-threading by default - A Skia drawing can be created on any dedicated thread. Only presenting the work runs on the UI thread.
• Symmetric with WebGPU - React Native Skia and React Native WebGPU share the same WebGPU instance.
• Zero-copy Three.js interop - A Three.js scene can be used as a regular Skia image with Skia effects on top, and Skia can draw onto Three.js scenes.
• Video & camera on GPU - importExternalTexture brings video and camera feeds into Skia zero-copy, easy on the battery.
• Lottie on WebGPU - Customizable Lottie animations, now with video imports.
• Android platform work - An experimental CanvasView (API 29+) and view snapshotting over WebGPU.

The release is mostly backward compatible with v2, except for the system requirements: Android minSDK is now 26, and OpenGL is no longer supported (Vulkan only).

Shopify will keep sponsoring the project until the end of the year, despite migrating its apps away from React Native.

• 💸 PostHog - Why we rebuilt our data warehouse on DuckDB over ClickHouse
• 🐦 Coinbase is going native too - After last week’s announcement from Shopify, this time it’s Coinbase announcing it's migrating away from React Native. We have seen a few devs here and there reporting that today developing 2 native apps and keeping them in sync is becoming easier. Let’s see how this trend evolves!
• 📜 Why has Shopify dropped React Native? - A deep dive into the decision process about moving away from RN, and why migration to the New Architecture was not enough.
• 📜 Native views in TypeScript: SwiftUI and Jetpack Compose from Lucent - React Native renders through a host tree; Lucent compiles the JSX away entirely.
• 📜 Live Activities with Expo, End-to-End: Client and Backend - A missing manual on how to implement Live Activities, its gotchas, including backend.
• 📜 Introducing Mobile Dev: full mobile dev tooling right in your Codex app - An agent supervision tooling with Simulator, Instruments, logcat, and Metro, all in one place.
• 💸 Codemagic Patch - Self-hosted OTA updates, complete with fingerprinting, release metrics and online dashboard
• 📦 Stim Desktop 0.1 - Watch and steer your agents' React Native work: live devices, replay, logs, build cache stats
• 📦 Nitro Markdown 0.14 - RaTeX math rendering now optional dependency, RN 0.77 floor, streaming/StrictMode fixes
• 📦 Maestro CLI 2.11 - Android 17 support, video scrubbing fixes, YAML validation changes
• 📦 Unistyles 3.5.0 - Theme propagation fixes, reload memory leaks, frozen screens no longer blocking JS
• 📦 React Native Deploy - EAS-compatible builds on GitHub Actions runners, free for public repos
• 📦 React Native Enriched Markdown 1.1 - Notion-like input shortcuts, native video rendering, GitHub admonitions, nestable block quotes, numberOfLines, and more
• 📦 Sentry React Native 8.29 - Swift Package Manager integration
• 📦 Voltra 2.4 - Android improvements, native modifiers for SwiftUI and Jetpack Glance
• 📦 Baton - Relay GraphQL client for SwiftUI and Compose
• 📦 Screen Choreography 0.7 - Hybrid transition handoff, transition preparation overlay, .0
• 📦 Nitro Fetch 1.8 - Support request priority, support formData() for urlencoded Request/Responsed
• 🤖 Apex - Agentic coding model specialized in React - Now generally available - Callstack coding agent shines for React Native and Next.js development.
• 🎙️ RNR 374 - Building "Dreaming: Language Learning" with React Native

🔀 Other​

• 👀 TypeScript 7.1 - Iteration Plan - Support for LSP, Content Mapper, Emit APIs, and more - The beta is delayed but should come out soon. This should unlock support for TS7 in TypeScript-ESLint.
• 👀 TC39 - 116th meeting outcome - JS proposals progressing include Composites, new Iterator methods, export defer, JSON parse options, and more.
• 📜 The Remix Way - Pragmatic feedback after rebuilding a personal blog and 10 other apps on Remix v3 over 6 months.
• 📜 Enforcing Best Practices with Jev as a Linter - Turns plain-English best practices into Oxlint rules using Jev.
• 📦 e2e - Next-generation agentic end-to-end testing framework for web and mobile apps - This lets you define actions and assertions in plain language, that you can interleave with more classic deterministic APIs. Model responses are cached so repeated runs are fast and inexpensive. The engine seems quite flexible, it can probably adapt to any UI. Interesting idea: it should help make tests more portable and less fragile, not relying on selectors or accessibility roles.
• 📦 Effect 4.0 - Fully rebuilt, dependency-free core, long-term support - Effect is gaining momentum as a way to make your TypeScript code more robust, providing additional guardrails for humans and AI agents. Up to 5x smaller bundles now make it even more compelling for client-side code. See also the now-official Effect Atom React bindings for state management.
• 📦 pnpm 12.9 & 12.10 - experimental 'loaded' linker, resolution settings in lockfile, StackBlitz WebContainers support, per-registry concurrency, faster caching, security fixes
• 📦 h3 2.0 - Minimal HTTP server framework for high performance, portability and composability
• 📦 SvelteKit 3.0 - Svelte meta-framework for rapidly developing robust, performant web applications
• 🎥 Remix Jam 2026 - Conference announcing the first stable release of Remix v3.

🤭 Fun​

See ya! 👋

This week we have 2 major releases in the React ecosystem: Panda CSS v2 and Vinext v1.

On the mobile side, RN is getting support for variable font and Android Activity Result. Lynx v4 is out. Lucent is a new way to write native modules.

I’m particularly excited about the TC39 meeting happening right now. Many proposals progressed, including my favorite one: Composites moved to stage 2!

Let's dive in!

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

• 🦋 Bluesky
• ✖️ X / Twitter
• 👔 LinkedIn
• 👽 Reddit

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⚛️ React​

Panda CSS 2.0 - Same styling API, a new engine underneath

This new major version of the type-safe, build-time CSS-in-JS library is the biggest update since launch. Here’s what you need to know:

• The CSS authoring experience doesn't change much.
• The compiler has been rewritten in Rust on top of Oxc.
• DX and builds get dramatically faster, and output better CSS.
• With source transforms, Panda integrates with the bundler so that css(), style props, recipes and patterns are compiled to plain class strings at build time. The styling runtime disappears from your bundle, not just the style-insertion logic.
• You get many new features to play with: a typography preset, publishing your Panda design system and visualize it in Studio, new CSS functions, a better CLI, an official ESLint plugin, and more

Vinext 1.0 - Next.js applications, powered by Vite

Cloudflare's Vite-based reimplementation of Next.js goes stable, supports both App and Pages Router and claims 99%+ compatibility with the Next.js test suite (minus Cache Components). They also have a different opinion of how ISR should work.

What started as a one-off slopfork experiment is now becoming an AI-driven software factory able to keep up with new features landing in the official Next.js implementation. Interesting time!

• 💸 PostHog - I wrote a 70x faster SQL parser while barely looking at the code
• 🔐 Next.js September Security - 16.3.8 and 15.5.27 - New security releases, covering 1 critical, 2 high, 5 medium vulnerabilities.
• 🗓️ React Summit US - 🇺🇸 New York – Nov 17 & 20. Join the creator of React Query, the Executive Director of the React Foundation, and other amazing speakers to dive into the React ecosystem. Save 10% on your ticket with code “TWIR”.
• 📜 GitHub - Improving site performance by shipping more CSS - The multi-year story of an incremental migration from styled-components to CSS modules.
• 📜 Rebuilding React Router's Global Hooks in Next.js - Explains how Next.js and React Router chose to manage state differently. Next.js has no useNavigation() or useBlocker() but you can rebuild them with a Context provider.
• 📜 Props Are Not a Design System - Style props and Tailwind class walls are just inline styles in disguise. Use named variants and modifiers instead.
• 📜 How we made claude.ai 3x faster in two weeks - Practical AI-driven perf work on a real React codebase. For example, their client-side app now renders a static composer so users can type before React even initializes. React commit counts, among many other metrics, serve as deterministic benchmarks for agents.
• 📜 AI, Open Source, and the Long Road to TanStack Charts - Recap of an X Space with Tanner Linsley. Not directly actionable, but interesting to see how he built a new charting library with AI in less than a week, reusing years of experience with Chart.js, react-charts, and Observable Plot.
• 📜 How to Sync a Design System with Claude Design
• 📦 Preact 11.0 - ESM-only, TS 5.1+, Hydration 2.0 with streaming SSR, refs as props, Object.is hook deps, React compat improvements - The first major in 6+ years, shipping necessary breaking changes to move the project forward.
• 📦 React Resizable Panels 4.14 - Grid layout components
• 📦 Redux Toolkit 2.13 - TypeScript 7 support, long list of bug fixes, new unified docs site
• 📦 Oxlint 1.86 - only-export-components now supports compound component, 2 React Compiler fixes
• 🎥 James Quick - Vinext 1.0 - A New Alternative to Next.js

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📱 React-Native​

• 💸 DeployPulse - Hosted OTA updates for React Native. A drop-in replacement for CodePush and EAS Update.
• 📖 React Native docs - fontVariationSettings - Variable font support - RN 0.88 will support configuring variation axes of a variable font.
• 📜 React Native Modules Cannot Use Android's Activity Result API - Modules load after the Activity starts, so the modern API was unusable from native code. Fix is coming in RN 0.89. No manual setup of MainActivity steps needed.
• 📜 Shipping super-calendar - A story about building a performant solution for RN and web. Virtualized rendering of visible dates only, and Reanimated shared values to skip re-renders.
• 📜 5 react-native-enriched-html Use Cases You Might Not Know About - More than a rich text editor: text processing like the emoji picker runs fully native, avoiding JS-side FPS drops on low-end devices.
• 📜 Agentic CI for Expo apps with TesterArmy - Code output outpaced review capacity, so merges ship with low confidence. Testing like a real user using agents restores it.
• 💸 Maestro MCP - A practical guide to mobile UI testing with coding agents
• 📦 React Navigation 7.23 - Add tabBarRepeatedPressBehavior - Defines the behavior when pressing an already-focused tab. Can scroll content to top and/or pop nested stack screens.
• 📦 Lynx 4.0 - Foldables, Media Queries, Liquid Glass & Blur, WebView, ReactLynx improvements, Generative UI
• 📦 Lucent - Write native modules in TypeScript, compiled to C++ and called through JSI
• 📦 React Native macO 0.83
• 📦 Appduct - Expose app tools to agents and tests, no debug menus in the binary
• 📦 Nitro SQLite 10 - Independent database handles, reusable prepared statements, macOS support
• 📦 Legend List 3.6 - Add viewPositionFallback for oversized list items
• 📦 Angular Native - Build native iOS and Android apps with Angular, built and shipped with Expo
• 📦 Nitro RTMP - Live streaming as a VisionCamera 5 output
• 📦 Plain Text 0.9 - Faster, drop-in remplacement for Text component, proper hyphenation, writingDirection
• 📦 Re.Pack 5.4 - Lazy per-platform Rspack builds, unified commands entry point, RN 0.87 support
• 📦 ViroReact 3.0 - visionOS, Web AR, co-location multiplayer, Studio and MCP tooling
• 📦 Skia 2.13 - Legacy architecture support removed, android.surfaceType to select the backing view, SPM support
• 📦 Sentry 8.28 - Native breadcrumb off-switches, PII accessibility identifier opt-out, MetricKit raw payloads
• 📦 Legend List 3.5 - scrollElement to share an ancestor scrollbar on web, less layout work for single-column lists
• 📦 Argent 0.26 - iPhone Duo simulator support, clearer simulator-server exit errors, Xcode Device Hub for booted simulators
• 📦 Agent Device 0.21.15 - iOS 27 SDK and Xcode 27 support, visionOS simulators, richer Android accessibility snapshots

🔀 Other​

• 🐦 TC39 meeting live updates - Progress for Composites, Iterator methods, export defer, and more - Among many other interesting JS proposals, my favorite one progressed! Composites are objects compared by value instead of identity, using interning. This is kind-of the “new version” of the former Records & Tuples proposal.
• 👀 WebSkills - A Huawei contributor recently pitched this at a W3C seminar, and W3C could incubate the project for a future standardization. Agent Skills, stored in the browser, running scripts in Web Worker sandboxes. Very early, but this could complete WebMCP and On-Device AI.
• 📜 Optimizing objects with null prototypes - Using null-prototype objects in hot paths can be a perf bottleneck for V8. Matteo works on Node.js WebStream optimisations, and just changing how those objects are created led to significant perf improvements.
• 📜 CSS linked parameters - One SVG, nine posters - Upcoming CSS feature to style an <img> SVG directly from the page CSS. Can be used today as a progressive enhancement.
• 📜 Electron to PWA: There and Back Again - PWA still can't deliver basic desktop app expectations.
• 📦 Vite+ 1.0 - A single vp command to manage your Node.js runtime, package manager, and frontend toolchain
• 📦 upm - A fast, tiny package manager for the npm registry - Written in TypeScript, yet as fast as Rust alternatives.
• 📦 Mock Service Worker 3.0 - Smaller, ESM-only, granular entrypoints, GraphQL subscriptions, Network API, socket-level Node.js interception - There’s also a new package to integrate with React Native.
• 📦 pnpm 12.7 - node shim follows .nvmrc, install --allow-build flag, wait for published packages to become available

🤭 Fun​

See ya! 👋

This week is rather quiet on the web side. Astro's React integration keeps ramping up. Redux is working on significant performance improvements for large apps.

On mobile, we still have a steady flow of interesting releases. Reanimated enabled its new layout engine by default. Shopify presented Helix, its internal tool to move away from RN. Xcode project format is finally moving to JSON!

We asked on 𝕏: do average devs still care about React?
Thanks to everyone who answered our existential question!
If fewer devs care about implementation details and React, what's the future of this newsletter? 🤷‍♂️
Reply by email and tell us how we can best serve you in this new AI-driven world.

Let's dive in!

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

• 🦋 Bluesky
• ✖️ X / Twitter
• 👔 LinkedIn
• 👽 Reddit

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⚛️ React​

• 👀 React docs - New <img> API ref page - The humble image component does more than just displaying images. It also generates preload hints during SSR by default, and integrates nicely with <ViewTransition> animations.
• 👀 React Flight PR - Server References for arbitrary object types - Experimental Flight protocol feature, enabling Server References to point to an object and not just a function.
• 🔐 Next.js 16.3.6 - Security Update - Fixing a critical remote code execution vulnerability for those using ImageResponse with the Node runtime with dynamic user-controlled SVG inputs.
• 🗓️ React Advanced London - 🇬🇧 London - 23 & 26 Oct. Last call for London's most in-depth React conference! Two days, 50+ advanced sessions, next to Big Ben. Don't miss it—get 10% off with code "TWIR.
• 📜 Do Frameworks Matter Anymore? - If LLMs are great at React but nobody reads the .tsx files anymore, why even use an abstraction? Will the industry stick with React forever, or is there room for platform primitives (Web Components) and new ideas (Remix 3)? Kinda related to my existential crisis. 😆
• 📜 React Activity: When A Render No Longer Guarantees an Effect - Blindly replacing conditional rendering with <Activity> can expose subtle bugs in legacy code relying on the render/Effect/cleanup sequence.
• 📜 Frontend for systems engineers - Explains React through familiar systems concepts
• 📦 Astro React 7.0 - Replaces Babel with Oxc, upgrades to Vite Plugin React v6 - It now has opt-in support for the React Compiler through Oxc experimental support.
• 📦 React Redux 9.4 alpha - useSignalSelector() hook, <SignalProvider> component, react-redux/signals entrypoint - Drop-in optimization for large apps with thousands of connected components. Opt-in, but +7kB gzip. A proxy tracks selector state access, so only affected selectors re-run on dispatch.
• 📦 Redact 0.1 - Add React 19.3 APIs, improve runtime compatibility, keep sync rendering contract- TanStack's lightweight, synchronous reimplementation of React is now on GitHub and ships its first minor.
• 📦 React Three Fiber 9.8 - Support for React 19.3, roots configured synchronously, Strict Mode fixed - For 3D enthusiasts, Poimandres also released Glyph, a GPU-first typography engine with R3F bindings.
• 📦 TanStack React Hotkeys 0.11 - Improved physical key support, recorder validation, conflict detection, cross-layout fixes
• 📦 React Simple Maps 5.0 - Composable SVG map charts for data visualization in React
• 📦 React Resizable Panels 4.13 - Deferred panel resizing, panel expand/collapse threshold
• 📦 react-zoom-pan-pinch 4.2 - Zooming, panning, pinching images and html elements, the easy way

💸 Sponsor​

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📱 React-Native​

• 💸 build mode - How much can you delegate to agents?
• 👀 React Native RFC - Secondary JavaScript runtimes in React Native - Worklet maintainer requesting a first-class C++ API to create secondary Hermes runtimes. This should help make the integration with libraries such as Reanimated/Worklets more robust, address debugging/inspector/HMR pain points, and more.
• 📜 Shopify Helix - The internal tool powering our native migration - Agents are powerful, but getting consistent results is difficult. Their solution needed tooling and guardrails.
• 📜 Deep Dive into ReactLynx: From Background Rendering to Instant First-Frame Rendering - Start of the series to answer how Lynx runs React on two threads, enables IFR and Main Thread Script.
• 📜 The KMP-on-iOS Scaling Problem That Rust UniFFI Fixes - A follow-up to last week’s KMP post and its challenge of scaling on iOS and how Rust's UniFFI fixes it.
• 📜 React Native in an Industry That's Changing - A look into how working with agents changes the decision process on where to draw the line between native and cross-platform.
• 📜 What Does Shared Business Logic in Rust Look Like on iOS & Android?
• 📜 Exploring Jev for AI-Driven QA with agent-device
• 💸 Codemagic Patch - Self-hosted OTA updates, complete with fingerprinting, release metrics and online dashboard
• 📦 Xcode 27.2 beta - JSON project format .xcproj - A new JSON format that’s more human-readable, editable by coding agents, and merge-friendly. Already the default for new projects.
• 📦 Reanimated 4.7 - New layout animations engine by default, animated backgroundImage, more Android CSS transitions
• 📦 Worklets 0.13 - Networking module for Bundle Mode runtimes, OXC Babel plugin port, SPM support
• 📦 Screens 5.0 alpha 3 - Stack v5 header customization on Android and iOS, FormSheet stacking, SPM support
• 📦 Expo Infinite Media - Native paged media feed, AVFoundation on iOS, Media3 on Android
• 📦 Numeric Text - SwiftUI's numericText on iOS, frame-measured native renderer on Android
• 📦 Secure Webview - Explicit origin allowlists. Native navigation enforcement. Blocked redirects. Deep-link protection. Fail-closed by default. - Built for security-critical flows like payments, OAuth, authentication, and 3-D Secure.
• 📦 Screen Choreography 0.6 - Declarative Enter/Exit reveals, duration-based springs, interactive gesture lifecycle
• 📦 View Shot 6.0 - RN 0.80+ required, 0.87 Strict TypeScript API support, html2canvas-pro optional on web
• 📦 Nitro SQLite 9.8 - iOS Application Support storage, performance mode, thread safety
• 📦 Sentry 8.27 - Session Replay runtime controls, per-class masking, iOS hang workaround
• 📦 Test Renderer 1.3 - React 19.3 support
• 📦 Legend List 3.4 - Scroll readiness callback, end-following fixes, direction-aware row preparation
• 📦 Arrangement View 0.1 - Adaptive split/overlay panes and hinge observation for foldables, early iPhone Duo support, Android coming soon
• 📦 Skia Layout - Flexbox layouts for React Native Skia powered by Yoga
• 📦 Pulsar Studio - Visual editor for custom haptic patterns, timeline design, audio and Lottie generation
• 📦 Enriched Markdown iOS 0.3 - LaTeX math, spoilers, highlights, GitHub alerts, better VoiceOver
• 📦 Agent Device 0.21.12 - Foldable simulator posing, recording contact sheets, Maestro permissions
• 📦 Delacour UI - shadcn-style component kit for RN: Uniwind styling, Reanimated interaction, Pulsar haptics
• 🤖 Apex - Callstack's React Native coding model - Based on Gemma 4, fine-tuned with SFT + GRPO on curated RN ecosystem data. Will be launched soon.
• 🎥 Beto - What's new in Expo SDK 58
• 🎥 Expo - Introduction to agentic self-healing apps

🔀 Other​

• 👀 TC39 - Agenda for the 116th meeting - Happening next Tuesday. Many Iterator proposals will likely progress to stage 4. I’m particularly excited to see if Composites will progress to stage 2!
• 📦 Chrome 154 - Responsive iframe resizing - Iframes can now resize themselves based on the size of their embedded document 🤯. Haven't all widget/extension authors dreamed of this for years, as an alternative to postMessage()?
• 📦 Edge 151-153 - My favorite newly-supported features are WebMCP (origin trial) and OpaqueRange to highlight in inputs/textarea (see my syntax-highlighted textarea demo).
• 📦 pnpm 12.6 - Automatic dedupe, automatic type installation, file:/link catalogs, and more - You may not need to run pnpm dedupe as part of your CI anymore! And wtf we had to figure out manually whether a lib has bundled types or is using DefinitelyTyped? Not anymore!
• 📦 Turborepo 2.11 - Native support for Rust/Python/Go, faster startup, nub/aube support - It’s interesting to see that both Turborepo and pnpm have become polyglot tools lately. Maybe the start of a new trend that AI now enables?
• 📦 Node.js 26.9- & 26.10 - Web Workers support, VFS improvements, enable ffi, add bench, debounce/throttle - Native support for throttle/debounce surprised me, RIP Lodash 😄
• 📦 jsdom 30.1 - Major performance, memory, and correctness improvements
• 📦 Rstest 0.12 - Playwright E2E testing, Module Federation testing, faster jsdom tests, new JS API
• 📦 tRPC 11.19 - Better request cancellation, TanStack Query skipToken fix
• 📦 ESLint 10.11 - Perf improvements: 20-25% faster initialization, faster rule execution

🤭 Fun​

See ya! 👋

Following the React v19.3 release, DevTools v8 is now officially published. Motion shipped a ViewTransition wrapper. React Router optimized re-renders. Apollo Client finally has custom scalars.

On mobile, we have a lot of releases. RN 0.88 will use React v19.3. Shopify is moving away from React Native!

Let's dive in!

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

• 🦋 Bluesky
• ✖️ X / Twitter
• 👔 LinkedIn
• 👽 Reddit

💸 Sponsor​

Live Workshop Series: Debugging AI Agents

Your agent returns something odd. Was it the prompt, a tool call that timed out, or output your code could not parse? Without traces, you are guessing.

On October 7, Serge from Sentry instruments three agents with Agent Tracing: a chatbot in an e-commerce store, a custom Slack agent, and a GitHub Action that reviews PRs. You'll see bad tool calls, unexpected output, and token spend per run.

On October 14, Ryan and Serge show how Sentry engineers debug their own agents and find the failures worth investigating across large volumes of production traces.

Both sessions are free. Register for the series.

⚛️ React​

• 💸 build mode - 2030-shaped software
• 👀 React DevTools 8.0 on the Chrome Web Store - If you use Chrome, you probably got the new version automatically. You should now see a new Elements > ⚛️React Element pane when inspecting elements in Chrome DevTools, and also a new top-level ⚛️Suspense tab.
• 👀 StyleX RFC - Add compile-time CSS enums and exhaustive matching
• 📜 The Cost of Abstraction for Humans and AI Agents - The author created the same React app with different levels of abstraction, then measured the cost of editing each app with Sonnet 5. He estimates that an over-abstracted codebase costs 30% more in AI agent bill and time. Also includes 6 abstraction patterns often seen in React codebases that you can probably inline.
• 📜 React Server Functions Are More Than Mutations - An interactive exploration of using Server Functions for reads via HTTP QUERY, then streaming values, while working on an Effect-based RSC framework.
• 📜 SolidJS, It’s the Little Things - Walks through 6 small Solid 2.0 DX details, from isPending() to optimistic stores, each compared side by side with the React equivalent.
• 📜 Fixing INP in a Massive React Dropdown - Opening a MultiSelect with ~1,200 options mounted at once blocks the main thread. Since all rows share the same height, a custom 90-line virtualization hook is enough to bring INP from 1,256ms down to 96ms.
• 📜 TSRX - Removing lazy destructuring - Preparing for v1.0, TSRX dropped its &{} destructuring syntax. This reflects its positioning as a JSX extension, rather than a new language that humans and LLMs would have to learn.
• 💰 The Amazon Developer Hackathon: Win up to $40k for the Fire TV track! 8 weeks to build and explore new agentic tools. Register now!
• 📦 Motion 13.4 - New <AnimateView> component - Wraps React's <ViewTransition>, adding support for spring support, dynamic targets, animation controls, and a simple props API. Interesting to see the lib pushing back on React docs' claims about View Transition performance compared to layout animations.
• 📦 shadcn lint - An agent-first linter for Tailwind design systems - Since className is just a string, design system rules are hard to enforce with types. This ESLint/Oxlint plugin lets you define per-component rules and emit actionable errors to guide your agents.
• 📦 Oxlint 1.83 - Update lint rules for React 19.3 - This fixes false-positive lint errors you may get by adopting React 19.3 features such as Fragment refs or newly supported DOM props.
• 📦 React Router 8.4 - Fewer re-renders, faster route matching (unstable) - The internal router state has been split into 4 contexts, so hooks like useLocation() will re-render less.
• 📦 Apollo Client 4.3 - Custom scalars, type-safety improvements - The GraphQL client finally ships built-in custom scalar support, its most requested feature: parse/serialize values like Date in one place
• 📦 React Hook Form 7.88 - Built-in <ErrorMessage> component - This lets you render one or many validation error messages for a given field.
• 📦 Astryx 0.6 - Responsive theme rules, adaptable selection, reworked Neutral palette

💸 Sponsor​

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📱 React-Native​

Shopify is moving away from React Native to native

An unexpected announcement from Shopify shook the React Native ecosystem. They’re moving away from React Native to native Swift and Kotlin!

So what’s their reason? Not because RN failed, but because coding agents changed the economics. Building twice no longer costs twice.

They started with a 12-week case study to migrate their flagship Shop app to native with 6 engineers, leading to the following improvements:

• improve startup time - iOS startup 3200ms → 2466ms (-23%), Android 4433ms → 2233ms (-50%)
• session stability - 99.5% → 99.95% (10x reduction)
• runtime performance on Android - 120 FPS on a Pixel device

It’s important to note that the app was 𝕏 not using the New Architecture, which was built to fix those problems.

Does it mean React Native is dead? Does not seem so. A shared application and UI layer remains useful, and React Native still has major benefits such as Over-The-Air updates and good foundations for server-driven UI, useful for the agentic era.

• 💸 Crisp - Customize your in-app support experience with our React Native SDK and flexible integration options
• 👀 React Native 0.88 RC.1 cherry-picked React 19.3 - Stable ViewTransition, Fragment refs, browser(), Trusted Types - This upgrade doesn’t look like a major change for RN devs on its own, but ViewTransitions and Fragment refs are React core features and may become supported on the RN side? 🤫
• 📜 You don't need a Mac to develop iOS apps anymore - EAS runs iOS simulators in the cloud, letting you test and build apps from any OS or browser. Android is also supported.
• 📜 Legend State: The Fastest React State Library You’re Probably Not Using - React's built-in state management can often be a source of performance problems. State managers such as Legend State help reduce re-renders thanks to observables.
• 📜 How Does KMP with SwiftUI Scale on iOS? - Sharing logic in Kotlin sounds ideal. The problem? iOS consumes one static framework. Does this cause a full rebuild on every change? Fortunately, no, but there's still a cost.
• 📜 Is Your App Ready for iPhone Duo? - A new mobile form factor is coming to iOS. Taking care of screen edges, safe areas, and adaptive layout is more important than ever.
• 📜 What It Actually Takes to Migrate Discord to React Native's New Architecture - Migrating a complex app to the New Architecture is not just a flip of a switch. There’s a long tail of issues and assumptions that need to be taken care of.
• 💸 Codemagic Patch - The easiest way to run your own OTA update server, complete with dashboard and fingerprinting
• 📦 ExecuTorch 0.10 - Ground-up rewrite, TS pipelines, Core ML/MLX/Vulkan acceleration - Orchestration moves to inspectable TypeScript with Core API for custom models without C++, worklets support for VisionCamera live streams, on-demand native binaries to trim bundle size, and a legacy entrypoint for gradual migration.
• 📦 Expo SDK 58 Beta - iOS 27 support, RN 0.88 RC, Expo Modules 2.0 beta, App Intents alpha, agent CLI, Android widgets, stable Expo Router data loaders and native tabs, and more - Another exciting Expo release that we’ll cover in depth once stable in 3-4 weeks!
• 📦 Screenmap - Visual navigation maps for Expo / React Native apps - A promising tool to add to your CI workflows: takes a screenshot of every app screen and posts a map to your mobile PRs, highlighting what has changed.
• 📦 Screens 4.28 - Android Tabs/Stack fixes, tab bar layout, and MenuItem IDs - Small bugfix release, but here’s a 𝕏 sneak peek of upcoming support for iPhone Duo
• 📦 Swift 6.4 - Swift Build is now the default in SPM. Improved language, Foundation, and standard library. Improved C++ and Java interoperability.
• 📦 Metro 0.87 - Scheme resolvers, babel-runtime resolution, Watcher memory cuts
• 📦 Nitro ZXing - Barcode scanner for VisionCamera written in C++, up to 10x faster than MLKit, and 2.6x faster for live camera frames
• 📦 Lynx 4.0 - AI docs for agents, generative UI using AI2UI renderer and OpenUI skill, dynamic elements, unified debug metadata, media queries
• 📦 WebGPU 0.10 - Chrome 154, SPM support, implicit device sync by default
• 📦 Gesture Handler 3.3 - Swipeable, Drawer, ScrollView and button press fixes
• 📦 Skia 2.12 - SPM support, handle invalid SVG parse results
• 📦 Boost 2.0 - Metro plugin replaces Babel, Animated/ActivityIndicator/StyleSheet/Platform optimizers, Uniwind support
• 📦 Screen Choreography 0.5 - defineTransition recipes, native forward preparation, live shared content
• 📦 Harness 1.5 - Windows platform support, harness ci commands, Metro config enhancer
• 📦 Voltra 2.3 - Server-driven Dynamic Widgets, configurable Android widgets, experimental Dynamic Live Activities
• 📦 Radon IDE 1.19 - Share booted devices with AI agents via Argent
• 📦 Argent 0.25 - WebView DOM in describe on Android, external device providers, script steps in flows
• 📦 Agent Device 0.21 - scroll-until finder, in-place iOS web sign-in, Maestro evalScript, 27–40% faster iOS opens, human takeover of remote sessions
• 📦 Stim 1.0 - Run several coding agents in parallel on RN apps, with build optimizations across worktrees
• 📦 Nitro Wakeword - On-device wake word detection for React Native, using the openWakeWord pipeline with ONNX Runtime
• 📦 Face Detector 2.1 - Auto-mode scaling fix for any frame/screen resolution
• 📦 Nitro Fetch 1.7 - Fix reject aborted requests when native finishes before cancel, multipart encoding, React Query/RTK examples
• 🎥 Code with Beto - How Marc Rousavy Turned Open Source Into a €20M+ Agency
• 🎙️ RNR 373 - Real Life React Native: Chime

🔀 Other​

• 📜 De-phantoming the npm ecosystem - Using Nub to find phantom (undeclared) dependencies in the top 10k npm packages.
• 📜 New Things You Should Know About HTML Here in Mid 2026 - Good overview of modern HTML from Chris Coyier.
• 📦 pnpm 12.4 - Support for Rust and Python dependencies, new pnpm pipeline task runner - Bold move: pnpm expands beyond JS and can now install Cargo crates and PyPI packages alongside npm deps. The ability to run cached task graphs makes it a lightweight Turborepo/Nx alternative.
• 📦 Safari 27 - Fix top-level await, import defer, customizable <select>, ariaNotify(), CSS improvements, ReadableStream improvements, MCP server, JSPI, and more - Major release! The ES module loader has been entirely rewritten, fixing long-standing top-level await bugs. JSPI (JavaScript Promise Integration for WebAssembly) is now available in all major browsers: an important primitive letting synchronous code compiled to Wasm (C++, Rust…) call async JS APIs. You can now connect your AI agent to Safari through the new MCP server.
• 📦 Modern Web Types - TIL TypeScript only types DOM APIs shipped in 2+ browser engines. This lib lowers the threshold to 1 engine, letting you use the newest APIs as progressive enhancements without losing type-safety.
• 📦 oj - The Vite dev server reimplemented in Rust - This alternative offers different trade-offs. Will soon power the Lovable sandbox previews, resulting in 4x better memory usage and 2x faster cold starts.
• 📦 Devframe - Framework for building pluggable, extensible, and playful DevTools - It powers Vite DevTools and Nuxt DevTools v4, and there’s a Next.js DevTools prototype.
• 📦 Zod 4.6 - z.validate(), z.properties(), z.iban(), z.fromJSONSchema() improvements - The new z.validate() method fails fast, returns false on error, up to 35x faster than z.safeParse().
• 📦 Webpack 5.111 - Stable ESM output, output.copy for static files, CSS minimizer improvements

🤭 Fun​

See ya! 👋

We could feel it was coming, and here it is, delaying just in time for the newsletter! 😇

React 19.3 is finally out, with View Transitions and Fragment Refs stable! And it looks like updated DevTools are also coming soon.

We also got a sneak peek of React Native 0.88 and Expo Modules 2.0.

Let's dive in!

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

• 🦋 Bluesky
• ✖️ X / Twitter
• 👔 LinkedIn
• 👽 Reddit

💸 Sponsor​

Atomic CRM: A CRM You Can Fork Instead of Subscribe To

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⚛️ React​

React 19.3

The new minor version of React is finally out, and it’s a great one!

If you read us regularly, we already disclosed everything 😇, but here’s a reminder of the highlights:

• View Transitions: now stable! Also including the addTransitionType API that lets you customize the animation directly from the code triggering it.
• Fragment Refs: now stable! This lets you get a ref of a <Fragment> and manipulate its underlying children DOM nodes. A quite useful feature unlocking new composition patterns that were previously difficult or requiring a wrapper DOM node.
• use(browser()): a first-class API to opt out a subtree of server-side rendering, replacing patterns based on typeof window and useEffect.
• Trusted Types: security feature to use in conjunction with Content-Security-Policy to prevent XSS attacks.
• RSC can render <Context>: no need to create a wrapper <ContextProvider> component anymore.

Make sure to read that blog post because it contains interactive examples worth taking a look at, in particular to understand View Transitions and Fragment Refs.

• 💸 Sentry - How to wire a custom metric into a Next.js app, chart it, and alert on it. Learn how.
• 👀 React DevTools 8.0 - Suspense Tab enabled, React Element panel, remove Timeline profiler in favor of Performance tracks, display dimmed Activity subtree - The v8 changelog is already merged and gives a sneak peek. Not published yet on npm or extension stores.
• 👀 React DevTools CDT MCP - Speaking of DevTools, the React team is also experimenting with a new package, recently published to npm. It’s not an MCP server, but lets Chrome DevTools discover/register/expose React tools useful for agents to understand and profile your app at runtime.
• 👀 React.dev PR - Document missing SSR and hydration options - Adding the missing API ref documentation for SSR options such as formState, importMap, maxHeadersLength.
• 👀 Next.js PR - Upgrade web-vitals to v6 and report soft navigations - useReportWebVitals() will soon report SPA soft navigations, recently included in Core Web Vitals.
• 📜 React Now Rusted All The Way Out - An overview of the React Compiler in Rust landing in Vite, reporting a 17x speedup over the Babel version, and giving an alternative solution for React Router framework mode users.
• 📜 Replacing Next.js with a vibe-coded "framework" - Replacing Next.js on a personal site with a 5k-line framework Claude architected. Still React/MDX on the server, Preact islands on the client, with 99% less JS shipped. This shows meta-frameworks could eventually die out: their knowledge can be distilled into skills instead, and custom frameworks can be created on demand.
• 📜 Next.js - How Turbopack chunks your JavaScript - Explains the trade-offs behind code splitting strategies and the heuristics used to minimize both download size and request count. Next.js 16.3 comes with experimental options to optimize chunking and fine-tune heuristics based on your site access patterns.
• 📜 Next.js- How we closed 1,500 GitHub issues in one month - No React lesson here: they built an agent to analyze backlog issues to help maintainers close thousands of issues with confidence.
• 💸 Prepathon by Cloudways - Virtual Event - Sep 22 & 23 - Two days of sessions and hands-on activities on AI-assisted building, modern deployment, and what's actually working for developers shipping fast right now. Free to join from anywhere in the world. Register now to save your spot.
• 📦 React Google Maps 1.10 - New new 3d components - The library completed its existing Google Maps 3D support with declarative components for GLB models, HTML markers, polylines, polygons, terrain flattening, and circular paths. A demo is worth a thousand words, so check this 3D Maps Markers demo to see fancy 3D markers, including an animated Model3D Balloon.
• 📦 cn - A new engine for Tailwind class merging and conflict resolution - Claims to be 30x faster than tailwind-merge + clsx with the same APIs. Already integrated in shadcn 4.21. Use npx shadcn migrate cn to migrate. Faster, but 26 KB minified; can be reduced with cn build.
• 📦 Effective RSC - An experimental, Effect-native React Server Components framework for Bun - Ideas are worth taking a look at. RSC pages are Effect.fn() functions with Schema-decoded route params. Effect unlocks various benefits for RSCs, such as type-safe dependency injection and error handling, or request abortion propagation.
• 📦 Vidact - Compiles React code to direct DOM operations - In beta, supporting a growing subset of React 19. Components run only once when they mount.
• 📦 uf - Unified Toolchain for Flow and React - A Rust-based toolchain comparable to Vite+, improving DX for React and Flow. The author’s arguments are worth reading: Flow is a more precise type system than TypeScript for describing React code.
• 📦 DevJar 1.0 - React live code playgrounds - An interesting alternative to CodeSandbox to embed interactive React-based experiences on your site.
• 📦 Bamboo CSS - Zero-runtime CSS-in-JS - A Vite compiler erases the runtime, prunes unused tokens, and fails the build on invalid tokens.
• 📦 Base UI 1.8 - Improves mount perf for Menu/Popover, Combobox.createItems() API, Avatar lazy-loading
• 📦 Rsbuild Plugin React Router 0.6 - Support React Router 8 and its RSC mode
• 📦 Storybook 10.6 - TanStack / NextJS-Vite framework fixes, CLI bindings for agent tools/skills, performance improvements
• 📦 React Window 2.3 - New optional rowKey/columnKey props
• 📦 Jotai 3.0 - Modernized ESM-only package, removing deprecated APIs

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📱 React-Native​

• 💸 build mode - Stop being the code review bottleneck
• 👀 RN 0.88 RC - SwiftPM tooling, DevTools screenshots, ArrayBuffer in TurboModules, Babel Platform inlining improvement, iOS SceneDelegate lifecycle - A sneak peek of the upcoming version from its changelog. Set up SwiftPM via npx react-native spm. Opt-in flags to drop legacy module/component interop will become the default later. Improved Platform.OS/select() inlining unlocks more platform-specific dead code elimination, around 𝕏 17.7KB on iOS and 19.6KB on Android.
• 📣 Expo Go - Login is now required to run projects - iOS-only for now. Will also be applied to Android later.
• 📊 React Native Navigation Benchmarks - Benchmarks the same app rebuilt 4x with different routers, covering cold start, RAM, FPS, and JS measurements. Android tests highlight the most common RN bottleneck.
• 📜 An early look at Expo Modules 2.0 - Modules become plain annotated Swift/Kotlin with no definition() DSL to learn. Sync calls run 2.5-5.6x faster than 1.0 on the same SDK and beat TurboModules in the Expo chart. Experimental, iOS-only. Android in progress.
• 💸 Codemagic Patch - The easiest way to run your own OTA update server, including dashboard and fingerprinting
• 📦 RN QuickJS alpha - Hermes-compatible JSI runtime - An alternative to Hermes. A tiny (~1.5MB) JavaScript engine that compiles to small bytecode bundles for faster startup, with a compatibility layer so most Hermes-dependent libs like Reanimated keep working without changes.
• 📦 Goldie - App Store screenshot generator for coding agents and humans - Useful framework-agnostic mobile tool. Argent replays flows; Goldie prepares store-compliant screenshots and preview videos.
• 📦 RN Continued Task - Background tasks that keep running after your app is backgrounded - One typed API over iOS 26 BGContinuedProcessingTask (Live Activity) + Android WorkManager foreground service, via Nitro. Useful for long-running user-initiated tasks like large exports, uploads, or encoding.
• 📦 Boost 1.7 - Image optimizer now default, RN 0.86 support
• 📦 Rozenite 2.4 - Auto-inject Lynx runtime, one endpoint for debug targets
• 📦 Sentry 8.25 - Feature flag info on native crashes, app.start vitals propagation
• 📦 Argent 0.24 - Physical iOS device support
• 📦 Uniwind 1.12 - Drop-shadow filter
• 📦 Streamdown 0.3 - Worklets 0.10 support
• 📦 Metro MCP 0.15 - MCP SDK v2, safer CDP reconnects pinned to same app, Hermes eval, Appium test gen
• 📦 Agent-Device 0.21 - Human takeovers in remote sessions, faster iOS Simulator opens, install size halved
• 📦 ReactLynx 0.126 - Now on Preact 11, 14% faster background renders, use() support
• 📦 Screen Choreography 0.4 - Shared-element transitions for Expo Router
• 🎙️ React Universe on Air - Running AI in the Browser With Transformers.js

🔀 Other​

• 🗳️ Interop 2027 - Submit and vote for your favorite proposals
• 📜 Running zod Schemas on simdjson - Combining zod with ata, a JSON Schema engine using simdjson native core, and the benefits this brings.
• 📜 Half Past Fetch - await fetch() only waits for the headers, not the actual body, and other interesting details.
• 📜 Async Solid - 3-part series: reads, writes, and network
• 📦 gpu-lexer - Language-agnostic WebGPU syntax highlighter - Crazy idea! Highlighting is not based on language grammars but on a small AI model trained for this purpose.
• 📦 Rslib 1.0 - Multiple output formats, multi-framework support, bundled or bundleless, style/asset support, and more - Looks like an interesting tool, in particular for publishing a component library across many frameworks.
• 📦 Vitest 5.0 - Perf improvements, vi.when, Trace View in Browser Mode, benchmarking API, better defaults, and more
• 📦 htmx 4.0 - fetch() replaces XHR, explicit inheritance, swaps all HTTP responses, and other breaking changes
• 📦 NestJS 12.0 - ESM-first, Rspack replacing webpack, Standard Schema validation, observability SDK
• 📦 Playwright 1.63 - Test locks, Locator improvements, aria/screen snapshots in traces, and more

🤭 Fun​

See ya! 👋