Callstack

How to Gradually Migrate From React Native Community CLI to Expo | Callstack Learn how to migrate your React Native Community CLI app to Expo incrementally, with minimal risk. Hosted by Callstack & Expo, August 5, 9AM PT.

It’s happening soon ⏰ Join Callstack and @expo.dev for a live session on migrating React Native Community CLI apps to Expo the right, non-disruptive way.

There’s still time to register and join live ➡️ clstk.com/4eZQqbo

How to Gradually Migrate From React Native CLI to Expo | Callstack Learn how to migrate your React Native CLI app to Expo incrementally, with minimal risk. Hosted by Callstack & Expo, August 5, 9AM PT.

If you want to add some Expo tools/services to your existing React Native project this webinar is for you.

Callstack’s @grabbou.com and Expo’s @keith.bsky.social will show you the incremental-migration best practices.

Sign up for the live walkthrough and bring your questions!

clstk.com/3UrUbNs

The full agenda for React Universe Conf 2025 is here 💥

Expect core team insights, cross-platform architectures, OSS stories, and real-world scaling lessons.

We’re bringing together devs from Meta, Microsoft, Vercel, Klarna & more. We still have some surprises up our sleeve 👀

Start small, scale smart.

On Aug 5, @grabbou.com & Keith Kurak will walk you through how to:

🧩 Start @expo.dev adoption with just 1 module
🚀 Add EAS Build, OTA updates, Router when it *actually* makes sense
🛑 Avoid common migration traps

Register at clstk.com/44T6WFu

Thinking of adopting Expo in a React Native project but not sure how to get started without breaking things?

Callstack’s @grabbou.com and @expo.dev’s Keith Kurak will show you how to migrate from RN CLI to Expo one step at a time.

Sign up for the webinar & bring your questions 📅 clstk.com/4f4Bxou

Better React Native starts like a good meal kit: clear recipe, quality ingredients, zero guesswork.

We trained 15 HelloFresh engineers in 8 weeks, resulting in faster delivery and a reusable onboarding playbook.

Dig into the case study 👉 clstk.com/4kRmQX5

Bring React Native Into Your App, One Step at a Time | Callstack A practical guide to incrementally adopting React Native in your iOS and Android apps. Learn modern integration techniques and avoid rewrite risks.

For a long time I thought the partial adoption/brownfield approach was an amazing way to use React Native.
But it always scared me how hard could it be to get started. And that's the exact reason why we created yet another book @callstack.com.

Get a copy free of charge here:
clstk.com/4kU87L3

Profiling React Native Internals with Tracy for Peak Performance Learn how to profile React Native internals with Tracy to uncover bottlenecks, optimize performance, and gain deep insights into your app’s native behavior.

If you want to see fiber-based systems in action (and debug them properly), Tracy's support makes it a really easy clstk.com/4o4sLed

How to Profile Multithreaded Applications the Right Way Learn how to profile and optimize multithreaded apps. Discover why more threads don’t always mean faster results and how bad thread contention really is.

This builds on our earlier piece on why multithreading isn't free, now extended with full fiber scheduling and Tracy profiling clstk.com/45jC2rh

3. Thread pinning + fiber pools maximize CPU core usage while avoiding costly context switching.

Key takeaways:
1. Fibers = cooperative coroutines with schedulers, offering low-overhead multitasking entirely in user-space.
2. Atomic counters beat traditional locks, as they allow for clean, dependency-based task orchestration without blocking.

Exploring Fibers: Cooperative Multitasking and Lock-Free Task Execution Explore how fibers enable lightweight, cooperative multitasking. This guide walks through building a simple scheduler, managing task dependencies without locks, and using Tracy to visualize performanc...

Ever wondered why React’s "Fiber" is called that?

Turns out it’s more than a name. It’s rooted in coroutines, user-space threads, and task scheduling. This deep dive explains how React, game engines, and modern runtimes squeeze performance using fiber-based systems.

clstk.com/44N5FRQ

Bring React Native Into Your App, One Step at a Time | Callstack A practical guide to incrementally adopting React Native in your iOS and Android apps. Learn modern integration techniques and avoid rewrite risks.

Download your copy of Incremental React Native Adoption in Native Apps ➡️ clstk.com/45e7Uxs

Step-by-step, code-first, and written by the devs who built the tooling.

Our new ebook is your guide to integrating React Native into native apps in a modular, gradual, and production-ready way

Includes:
✅ Packaging configs
✅ XCFrameworks & AARs
✅ Brownfield best practices

Read it now 👇

Fast, Customizable Shimmer Effects for React Native Apps A modern shimmer library for React Native with smooth UI skeletons, minimal dependencies, and optimized performance using Reanimated and SVG. Drop-in ready with full customization and shared animation...

Spinners are out, and shimmers are in ✨

We just released a new library for React Native that makes your loading states beautiful, fast, and modern.

It’s called `react-native-fast-shimmer` and @q1w1n.bsky.social wrote an article about it clstk.com/44Qs8gV

Want to write your first cross-ecosystem native module? @shirakaba.bsky.social shares how to use Node-API to create a native module that runs not only on Node.js, but React Native, too clstk.com/3INHNVm

React Universe Meetup - YouTube Welcome to the React Universe Meetup playlist—Callstack’s global meetup series for React and React Native developers. Each edition features in-depth tech tal...

The React Universe NYC 2025 meetup talks are now live on our playlist! 🎥

Featuring:
- Brownfield RN adoption using RNEF (Callstack)
- Debugging with OpenTelemetry (Embrace)
- Global observability insights (HelloFresh)

Check them out here: youtube.com/playlist?lis...

Big news: the React Native DevTools framework is dropping by the end of this month 🔥

The name? It's locked in and I'm so excited about it. It kicks off a whole family of tools designed to push React Native even further… but I'm not allowed to say anything else at this point 🙊

Structure Monorepo for Speed, Scale & Sanity With Nx Discover how Nx empowers teams to build and scale monorepos without losing their sanity, from selective testing to AI-powered workflows.

What if your CI only built what mattered? In our latest React Universe On Air, Jordan Powell explains how Nx helps teams build monorepos that don’t feel monolithic. Watch here → clstk.com/44yRKib

Live Dev Session: Week 29 React & React Native Rundown | Callstack Join Callstack’s Łukasz & Kewin for a live React recap: fresh news, vibey code sessions, and good dev talk. Happening Wednesday, July 16, 5PM CEST.

Live dev session - what should we play with today?

No new ThisWeekInReact yet (we’re refreshing our inbox hourly), and I just did the NODE-API stream yesterday.

I forgot to show off BISON last week. If you wanna see what that is, join us live!

Streaming today at 5 PM CET
clstk.com/40joutb

Build High-Performance Modules in React Native With Node-API | Callstack Discover how to build and share native code in React Native using Node-API: faster builds, runtime agnostic, and language flexible.

We go live at 5PM CEST ⏰ Node-API in React Native: high-performance native modules. Watch it here 👉 clstk.com/3U7qfG8

On-Device Apple LLM Support Comes to React Native React Native now supports Apple’s on-device LLM for private, fast, and offline AI experiences. Build with Foundation Models and bring Apple Intelligence features to your mobile app.

React Native gets Apple Intelligence 🎉 We just dropped preview support for on-device Foundation Models:
• Text gen & treaming
• Structured output
• Vercel SDK-ready
Find out more in @grabbou.com's blog post ➡️ clstk.com/4nSRzG4

Monorepos can be intimidating. Thousands of files, tangled dependencies, CI times that never end… But what if they could feel like a piece of cake?

In our next episode, Jordan Powell (Nx) shows how smart tooling makes monorepos scalable and actually pleasant to work in 👉 youtu.be/9OqzGMWHZTA

We’re going live on July 15 to show how Node-API powers native modules in React Native, without platform-specific hacks. Join @lukasz.app, @kraenhansen.dk, and MariuszPasiński at 5PM CEST 👉 clstk.com/3Uamb80

QA and devs, testing the same PR at the same time? React Native Enterprise Framework makes it real.

Skip CocoaPods, share builds, tighten feedback loops 💅

Catch the full podcast episode here ➡️ clstk.com/3GBnTMK

Announcing Node-API Support for React Native We are bringing Node-API to React Native to simplify native module development. Learn why this ABI-stable, cross-runtime system could replace JSI and unlock faster builds, better maintainability, and ...

Node-API isn’t new, but using it in React Native is. It opens the door to:
- ABI-stable native modules
- Multi-language support (C++, Rust, Swift)
- Prebuilt binaries that just work

Here’s how it works and why it matters 👇 clstk.com/4nFQjG3

Live Dev Session: Week 28 React & React Native Rundown | Callstack Join Callstack’s Łukasz & Kewin for a live React recap: fresh news, vibey code sessions, and good dev talk. Happening Thursday, July 10, 5PM CEST.

Today’s the day. React doesn’t pause for July, and neither do we.

Join @lukasz.app and @q1w1n.bsky.social for Live Dev Session: Week 28.

Expect code talk, ecosystem updates, and some good chaos ✨ clstk.com/4nwh5AN

Out of office? Not us. @lukasz.app and @q1w1n.bsky.social are live on Thursday to unpack what’s been going on in React & React Native this week.

Check out @grabbou.com talk on building federated mobile apps with React Native and Re.Pack.

Dynamic UIs, async code loading, real SDK isolation.

Watch the full breakdown of what makes a super app… super 🎥 clstk.com/3SHKQjV

Thanks for filling up the room yesterday, everyone — despite the full-blown summertime weather in NYC. 🌴 It was awesome to host you! ❤️‍🔥

Today ➡️ @vercel Ship.