16 issues in, and the bar for "Good Engineering" keeps rising. Don't just build—build with intention.
Join 57+ senior developers who spend their Sunday morning leveling up.
Read Issue #16 & subscribe:
👇
react-weekly.dev/newsletter/16
Rounding out the issue:
📳 Haptics: @swmansion.com explains why tactile feedback is a business lever, not just a gimmick.
📲 Lean OTA: @expo.dev shares the guide on keeping your Over-the-Air updates fast and small.
How do you ensure an AI feature works when you have 7 different providers? 🤖🧪
The @tanstack.com team shared their internal framework for testing TanStack AI across OpenAI, Anthropic, Gemini, and more. Consistency is the hardest part of AI engineering—here’s how the best in the business handle it.
Real-time mobile computer vision just hit a new gear. 📸🏎️
@mrousavy.com and the team at @margelo.com dropped VisionCamera v5.
• New Frame Processor engine (5x faster).
• Better hardware sync.
• iOS 19 & Android 16 ready.
If your app handles video or AR, this update is a massive win for UX.
The king of UI libraries just got a massive performance injection. 🎨⚡️
MUI v9 introduces MUI System 2, cutting CSS runtime overhead by 40%. It also revamps "Base UI" for those who want the logic of MUI without the pre-baked styling.
Folders shouldn't be organized by "what they are" (types), but by "what they do" (features). 📁
@tkdodo.eu makes a compelling case for the Vertical Codebase. Stop jumping between 5 different directories to fix one feature.
React Weekly Issue #16 is officially LIVE! ⚛️🏗️
🧵 The breakdown:
📁 The Vertical Codebase (via @tkdodo.eu)
🎨 MUI v9 (40% faster runtime)
📸 VisionCamera v5 (5x faster engine)
🤖 Testing AI across 7 providers
📳 The ROI of Haptics
15 issues in, and the React ecosystem is still finding new ways to surprise us. Don't just follow the crowd—understand the architecture.
Join 1,000+ senior engineers who start their week with the "Sunday Spark."
Read Issue #15 & subscribe for free:
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react-weekly.dev/newsletter/15
Rounding out the 15th issue:
☁️ @cloudflare.social Emdash: Bridging the gap between legacy WordPress and modern edge computing.
📚 MDN Deep Dive: A 2026 refresher on front-end standards—from CSS Subgrid to the latest Web APIs.
Stay grounded in the standards while pushing the edge.
The "Write Once, Run Everywhere" dream just got a major patch. 🗺️
@expo.dev Router v5.5 is here, further bridging the gap.
• Advanced native navigation primitives.
• Drastically improved SEO for the web side.
• Better SSR performance for unified apps.
Stability and speed are the headlines for React Native 0.85. 📱✨
The team has officially optimized Bridgeless mode by default, leading to massive reductions in startup latency. The "New Architecture" isn't just a promise anymore—it’s the standard for 2026.
Is "Framework Fatigue" starting to peak? 🚂
The team at @railway.com just dropped a detailed breakdown of why they migrated their dashboard off Next.js. It’s a fascinating look at when a framework’s complexity starts to outpace the needs of the project.
React Weekly Issue #15 is LIVE! ⚛️🏗️
🧵 The breakdown:
🚂 Why @railway.com moved OFF @nextjs.org
📱 @reactnative.dev 0.85 (The Performance Core)
🗺️ Expo Router v5.5
☁️ Cloudflare Emdash
📚 MDN Front-End Deep Dive
The best engineers don't just write more code; they pick the right primitives.
Join the 50+ developers who spend their Sunday morning getting a leg up on the competition.
Read Issue #14 & subscribe for free:
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react-weekly.dev/newsletter/14
Why has @expo.dev become the default for high-velocity teams? ⚡
It’s not just about the components—it’s about the infrastructure. We explore the "unreasonable effectiveness" of the Expo workflow and how it removes the boilerplate that usually kills a project's momentum.
Can 5 engineers keep millions of people eating safely? 🥗
The latest case study on Fig is a masterclass in lean engineering. By offloading infrastructure heavy lifting to the Expo ecosystem, they’ve managed to support a massive, critical user base without a massive headcount.
Shipping mobile updates shouldn't eat your users' data plans. 📉
Expo SDK 55 introduces Bundle Diffing for OTA updates. Instead of shipping the whole bundle, you only ship the binary changes.
Smaller updates = higher success rates = happier users.
State management in routing just got a massive upgrade. 🧠
@tannerlinsley.com breaks down the new Signal Graph architecture in TanStack Router. By using signals to track state, the router achieves surgical re-renders and a highly predictable data flow for even the most complex apps.
React Weekly Issue #14 is officially LIVE! ⚛️🚀
🧵 The breakdown:
🧠 @tanstack.com Router’s Signal Graph
📉 90% smaller OTA updates (Bundle Diffing)
🥗 Scaling Fig: 5 engineers, millions of users
⚡ The "Unreasonable Effectiveness" of Expo
The boundaries of what we can build with React are disappearing. Don’t get stuck in the browser—start building for the world.
Read Issue #13 & subscribe for free:
👇
react-weekly.dev/newsletter/13
Is your testing suite hiding an inaccessible product? ♿
@tkdodo.eu drops a necessary truth bomb: "Test IDs are an accessibility smell." If your tests can't find elements the way a real user (or a screen reader) does, you aren't actually testing your app—you’re testing your implementation.
The local-first revolution just hit a major milestone. 💾
TanStack DB 0.6 is officially out.
• New persistence layer for production readiness.
• Support for relational "includes" in data fetching.
If you’ve been waiting for a reason to go local-first, @tannerlinsley.com just gave you one.
Your React skills just got a hardware upgrade. ⌚🤖
We’re diving into the Fieldy AI case study. Learn how they used the Expo ecosystem to build a dedicated AI wearable. It’s a masterclass in how modern mobile tooling is escaping the smartphone.
Next.js isn't just for the web anymore. 🌐
Vercel has outlined a massive vision for "Next.js Across Platforms." Imagine a unified DX that stretches from your web app to desktop and even embedded environments using shared primitives.
The "Everywhere" framework is becoming a reality.
React Weekly Issue #13 is LIVE! ⚛️⌚
🧵 The breakdown:
🌐 @vercel.com’s vision for Next.js Across Platforms
⌚ How @expo.dev is powering AI wearables
💾 @tanstack.com DB 0.6 (Persistence is here!)
♿ Why your test-ids are an a11y warning sign
The ecosystem is moving at the speed of Rust. Don’t get left behind in the node_modules dust.
Join the senior engineers who start their Sunday with the "Sunday Spark."
Read Issue #12 & subscribe for free:
👇
react-weekly.dev/newsletter/12
Stop using useEffect to sync state. 🛑
We’re featuring Alvin Sng’s 5 strict rules for cleaner, more predictable components.
Also: Why the team at aha.io ditched Gatsby to build their own 1,000-line custom RSC framework. The result? A 90% reduction in shipped JavaScript.
Android developers, your world just changed. 📱
@expo.dev SDK 55 (Beta) introduces Jetpack Compose support for React Native. You can now use native Android UI declarations and Material Design 3 directly in your app while keeping the React DX you love.
Not to be outdone, @vercel.com just dropped Next.js 16.2. 🏎️
By optimizing how Server Component payloads are deserialized in the V8 engine, they’ve achieved:
• 87% faster developer startup.
• 60% faster rendering in production.
Plus, the framework is now "AI-Ready".
The Rolldown era is officially here. 🦀
@vite.dev 8 has swapped out its core for Rolldown, a unified Rust bundler. What does that mean for your workflow?
• 10-30x faster production builds.
• A new "Full Bundle Mode" for massive enterprise apps.
Build times are finally becoming a non-issue.