Michał Pierzchała
@thymikee.bsky.social
OSS & R&D at Callstack
Reposted by Michał Pierzchała
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!
October 17, 2025 at 7:32 PM
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!
Reposted by Michał Pierzchała
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
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
React Conf 2025 | October 7-8 | Henderson, Nevada & online | Join us!
conf.react.dev
October 6, 2025 at 1:12 PM
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
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
Reposted by Michał Pierzchała
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
September 26, 2025 at 2:48 PM
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
Reposted by Michał Pierzchała
🖤❤️ 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...
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...
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
infinite.red
July 25, 2025 at 10:40 PM
🖤❤️ 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...
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...
Reposted by Michał Pierzchała
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...
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...
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
hangzhou2025.gosim.org
September 9, 2025 at 11:27 AM
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...
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...
Reposted by Michał Pierzchała
Reposted by Michał Pierzchała
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
🔍 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
Your Android React Native App Is Big Because It's Missing This One Setting
YouTube video by Callstack
youtu.be
June 13, 2025 at 12:52 PM
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
🔍 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
Reposted by Michał Pierzchała
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.
June 11, 2025 at 1:26 PM
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.
Reposted by Michał Pierzchała
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
You’re Loading Too Much Unnecessary Hermes Polyfills
YouTube video by Callstack
youtu.be
June 5, 2025 at 6:48 AM
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
Reposted by Michał Pierzchała
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?...
Auto Memoization in React Native? React Compiler Has You Covered
YouTube video by Callstack
youtu.be
May 30, 2025 at 12:17 PM
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?...
Reposted by Michał Pierzchała
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
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
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.
bit.ly
May 22, 2025 at 9:04 AM
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
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
Reposted by Michał Pierzchała
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
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
May 19, 2025 at 12:25 PM
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
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
Reposted by Michał Pierzchała
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...
May 5, 2025 at 12:47 PM
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...
Reposted by Michał Pierzchała
@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
{Webinar} Why You Need React Native Enterprise Framework
YouTube video by Callstack Engineers
youtu.be
April 11, 2025 at 11:53 AM
@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
Reposted by Michał Pierzchała
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
April 8, 2025 at 2:36 PM
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
Reposted by Michał Pierzchała
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
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
March 12, 2025 at 4:26 PM
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
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
Reposted by Michał Pierzchała
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.
Say hello to a new framework! Built by our team to solve real-world challenges of scaling React Native in enterprise environments.
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 ⬇️
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 ⬇️
March 5, 2025 at 6:42 AM
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.
Say hello to a new framework! Built by our team to solve real-world challenges of scaling React Native in enterprise environments.
Reposted by Michał Pierzchała
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.
Build once, reuse everywhere!
Build React Native apps in seconds, not in hours.
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 ⬇️
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 ⬇️
March 4, 2025 at 5:33 PM
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.
Build once, reuse everywhere!
Build React Native apps in seconds, not in hours.
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 ⬇️
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 ⬇️
March 4, 2025 at 4:32 PM
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 ⬇️
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 ⬇️
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-...
⚡️ 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-...
February 28, 2025 at 2:59 PM
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-...
⚡️ 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-...
Reposted by Michał Pierzchała
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!
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!
February 5, 2025 at 4:17 PM
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!
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!
Reposted by Michał Pierzchała
Who said you need to recompile the whole app to just update the React Native JavaScript bundle?
Hold my IPA 🍺
Hold my IPA 🍺
February 4, 2025 at 2:01 PM
Who said you need to recompile the whole app to just update the React Native JavaScript bundle?
Hold my IPA 🍺
Hold my IPA 🍺
Adding React Native to existing apps should be that simple. No node_modules, no CocoaPods, just import
February 3, 2025 at 5:38 PM
Adding React Native to existing apps should be that simple. No node_modules, no CocoaPods, just import
Reposted by Michał Pierzchała
🚀 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...
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...
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.
expo.dev
January 14, 2025 at 3:26 PM
🚀 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...
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...