Harness isn't a simple tool - it's a bunch of components working together to give the best DX for testing JS code with native modules. Maintaining all that as a solo dev isn't easy, so I tried offloading some work by using Jest's CLI to run Harness… and it worked!

React Conf 2025 | October 7-8 | Henderson, Nevada & online | Join us!

We’re so excited to be co-hosting React Conf again this week!
Find us at:
- Callstack booth (main hall)
- “React Everywhere: Bringing React Into Native Apps” by @grabbou.com, Oct 8, 2:05PM
- “What’s the Framework of the React Future?” panel with @thymikee.bsky.social, Oct 8, 4:20PM

👉 conf.react.dev

We're excited to announce React Conf speakers from some of your favorite React frameworks and build tools like @expo.dev @nextjs.org Parcel @reactrouter.com @redwoodjs.com Rock @tanstack.com

React Native Radio - RNR 338 - React Native Enterprise Framework w/ Michał Pierzchała Michał Pierzchała from Callstack joins Jamon and Robin to talk about the React Native Enterprise Framework and why big teams need it

🖤❤️ RNR 338 ❤️🖤

This week: Michał Pierzchała (@thymikee.bsky.social) joins @jamon.dev and @robinheinze.dev to discuss @callstack.com's new React Native CLI and framework, the React Native Enterprise Framework.

Listen now 👇
infinite.red/react-native...

Native Apps Without a Build Step – GOSIM Hangzhou 2025 React Native apps are bigger and more complex than ever. At Callstack, we've built Rock—open, modular, self-hosted, and incrementally adoptable framework for Re

This week we're heading to China 🇨🇳

At GOSIM Hangzhou 2025 @thymikee.bsky.social & @kwasniew.ski will walk through Rock - an open-source framework that helps teams skip the build step and move faster with React Native.

📍Sept 13, 14:00–17:30, Venue 9 - B05
hangzhou2025.gosim.org/schedule/nat...

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 ...

Announcing Node-API Support for React Native
callstack.com/blog/announc... #reactnative #nodejs

Your Android React Native App Is Big Because It's Missing This One Setting YouTube video by Callstack

Building a React Native app for Android from default template? Then chances are you're also shipping:
🔍 unused code
🐛 debug artifacts
📦 code that’s bigger than necessary

In Episode 3 of React Native Optimization in Practice, @thymikee.bsky.social shows how to fix it with R8 ➡️ youtu.be/Ud6TSlnEzCc

Let me paint you a picture: It’s Friday, 2pm. You’re wrapping up a PR with important bugfixes. “It’s only 2pm and I’m almost done! This is going to be a great day!” You commit, push and go grab a coffee, because you know the build will take a half an hour at least.

You’re Loading Too Much Unnecessary Hermes Polyfills YouTube video by Callstack

Episode 2 of React Native Optimization in Practice is here 🎬 This time, @thymikee.bsky.social‬ covers another common pitfall: using web polyfills in React Native when you don’t need them. The fix? Use dedicated SDKs built for mobile. Here's why 👇 youtu.be/_Yo1kHz7h_I

Auto Memoization in React Native? React Compiler Has You Covered YouTube video by Callstack

React Native performance tip: auto memoization cuts unnecessary re-renders, without touching your code. In the first episode of our new series, @thymikee.bsky.social shows how React Compiler makes that possible ➡️ youtu.be/28dpqPr4OC0?...

Adding React Native to iOS and Android Apps Has Never Been Easier | Callstack Learn how to easily add React Native to your iOS and Android apps with a modern brownfield setup powered by Callstack’s open-source tooling.

React Native Brownfield used to be the nightmare scenario. Well, not anymore. Join me & @thymikee.bsky.social
on May 27 as we share how we would create a new brownfield project today with all the best practices and our learnings. Don't miss out!

bit.ly/43ipazy

React Native in native apps used to be… messy. On May 27, we’ll show you how that’s changed.

Join @thymikee.bsky.social and @atlj.dev for a walkthrough of how React Native Brownfield works today and what’s still coming with the React Native Enterprise Framework 👉 bit.ly/4ktvRpr

React Native teams: this is the CI fix you've been waiting for. Join us on May 12 for a practical webinar on 20x faster builds with no extra infra featuring @grabbou.com & @thymikee.bsky.social 🎫 streamyard.com/watch/2WbpTX...

{Webinar} Why You Need React Native Enterprise Framework YouTube video by Callstack Engineers

@grabbou.com and @thymikee.bsky.social walked through the React Native Enterprise Framework—why we built it, how it works, and how it shaves CI build times from 30 minutes to seconds. Catch the full webinar and see it in action ➡️ youtu.be/yf-UZJ84-Gk

https://conf.react.dev

React Conf is back for 2025! Join our co-hosts, Meta and @callstack.com , October 7-8 in Henderson, Nevada or join the free livestream

Introducing React Native Legal 🧑‍⚖️

Zero config license generator for React Native apps.

• Use in Expo apps with "react-native-legal" config plugin
• Use in Community CLI projects with "legal-generate" command
• Works with iOS, Android, tvOS and AndroidTV

Ah yeah. Although for now we stick to only storing remote builds in cache. What you build locally is yours and we currently don’t expose a way to upload it (although you can easily do it through GitHub API). We’ll consider this use case

We’re not building locally anything here. Retrieving the cache from GitHub artifacts

Build once, reuse everywhere ✨

Say hello to a new framework! Built by our team to solve real-world challenges of scaling React Native in enterprise environments.

Today we're introducing a new React Native Framework, successor to React Native Community CLI.

Build once, reuse everywhere!

Build React Native apps in seconds, not in hours.

New React Native Framework for Enterprise | {callstack} We're building a new React Native Framework for Enterprise that integrates with your existing infrastructure. Build once, reuse everywhere.

Wait list: enterprise-framework.callstack.com

We'll be open sourcing this project soon!

Watch @szymonrybczak.bsky.social and @mdjdev.bsky.social from @callstack.com
who help me build this for more insights 🙌

Introducing a new React Native Framework for Enterprise apps. ✨

Built around native build reuse, incremental adoption and self-hosting at your own infra.

Because the best build is no build.

Hop on the wait list ⬇️

screenshot of re.pack 5 powered by Rspack

Re.Pack 5 is finally here!

⚡️ 5x faster with Rspack
🤝 Module Federation 2 support
🪶 90% smaller config
🛠️ Reanimated, Expo Modules, & NativeWind plugins

You can try it with:
npx @callstack/repack-init@latest

Blog post on brand new docs ✨: re-pack.dev/blog/repack-...

React Native Core Contributor Summit 2024 Recap · React Native Every year, the core contributors in the React Native Community get together with the React Native team to collaboratively shape the direction of this project.

React Native Core Contributor Summit 2024 Recap: reactnative.dev/blog/2025/02...

#ReactNative

The new version of React Native Bottom Tabs is out! 🎉

A new highly anticipated feature: Custom JavaScript Tabs! ✨

Provide your custom tab bar while leveraging native navigation underneath 🚀

Here is a demo of it in the 🦋 app!

This demonstrates smooth screen transitions using native animations!

Who said you need to recompile the whole app to just update the React Native JavaScript bundle?

Hold my IPA 🍺

Adding React Native to existing apps should be that simple. No node_modules, no CocoaPods, just import

EAS Hosting (Preview): Host Expo server code in the cloud with EAS Introducing EAS Hosting: the first ever end-to-end deployment solution for universal app development.

🚀 Today we’re thrilled to introduce EAS Hosting — the first ever end-to-end deployment solution for universal app development.

With EAS Hosting you can deploy and scale universal API routes, React websites, and more! 🌐✨

✍️ @kitten.sh
📽️ @kadi.bsky.social

expo.dev/blog/expo-an...

That’s awesome! Wait for more updates in early 2025, we’ll hopefully save you some work :)

Working on this with @szymonrybczak.bsky.social and @mdjdev.bsky.social.
Read more at incubator.callstack.com/articles/bes...