Michał Pierzchała
@thymikee
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Head of Technology @callstackio . Core @fbjest 🃏 and @reactnative Community contributor. Made @twentttyapp .
Krakow, Poland
Joined August 2010
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React Native moves to TypeScript template by default, removing Flow 🤯
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With React Native v0.71 release we'll get:
- New app template is TypeScript by default
- TypeScript declarations shipped with React Native
- React Native documentation is TypeScript First
Great to see RN investing in what most of the community uses 👏
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TypeScript types are now a part of the React Native codebase 🎉 Shipping in v0.71
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I’m happy to announce a new testing library to help you write better React Native tests with less effort.
react-native-testing-library 🎉🎉🎉
It’s like react-testing-library but tailored for RN and universal React apps. Happy testing! 🙃
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Jest 28 is out, packed with:
- `--shard` option to speed up CI 2-3x
- `github-actions` reporter
- configurable fake timers
- improvements around ECMAScript Modules
And more. What's nice is most contributions are first-time. Brought to you by
@SBekkhus
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React Native 0.60 is out and it's powered by React Native CLI v2.0 🚀. It comes with *a lot of* improvements. One of which is the documentation, which I highly encourage you to read 🤓
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Finally printed the guide as a book and it looks slick. Meet me in SF tomorrow if you'd like to get a free copy 😊
Thanks
@marta_pinkowska
for taking care of making this analog version a reality 🙌
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Today we're open sourcing Reassure – a performance regression testing library for React and React Native 🥳
Built at
@callstackio
in partnership with
@EntainGroup
✨
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With React you are:
• web dev
• mobile dev
• desktop dev
• tv dev
✍️checks notes ✍️
• Apple Vision Pro dev
Today is the day! Apple Vision Pro is out and React Native is ready! 🥽
We just released React Native visionOS 0.73 🚀
I wrote a blog post on how you can get started ⬇️
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React Native CLI now automatically migrates your Android 🤖 dependencies to AndroidX with "jetifier" before building the app 🚀.
Always make sure you're on the latest version to get such improvements (we release independently of React Native):
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Starting from React Native v0.73 (happening in ~2-3 months), all libraries will need to be updated with these two one-liners due to Android Gradle Plugin upgrade
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In case you wonder whether using inline styles vs StyleSheet in React Native matters from a performance point of view—it doesn't.
React renderer is smart enough to pass only the style attributes that actually changed through the bridge. Which you can inspect with MessageQueue
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I heard you like TypeScript.
@fbjest
has your back with default support in next major release 🎉
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React Native has recently hit a 1M downloads per week milestone on npm 🥳
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Do you have that one article that you point people to over and over again? To me it's "stop mocking fetch" by
@kentcdodds
. Such a time saver. Thank you Kent!
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Did you know you can shave even 70% of your Node app load time with a single
@babeljs
plugin? 🤔 This diff makes
@reactnative
CLI 0.5s faster to boot, from 0.7s to 0.2s. Now it really feels instant 🏎
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Friendly reminder that you should upgrade your Android React Native apps to at least v0.71 (or Expo SDK 48+) before August 31 ✨
If you face challenges upgrading, my DMs are open 📩
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We're in the middle of converting
@reactnative
CLI codebase to TypeScript. If you'd like to help us get over the finishing line, come say hi at 👋
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Jest v30 is coming soon with:
• up to 20% performance improvement for test runs
• JSDOM 22, TypeScript 5, Prettier 3
• support .mts and .cts by default
• improved memory leaks detection
Shipped by amazing
@SBekkhus
🙌
Full changelog ⬇️
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React Native is working on the event-loop implementation that's closely aligned to the web spec, including:
• sync access to layout information and blocking paint
• microtasks without polyfills
• better perf with proper scheduling
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If you read between the lines, US President is telling you to use React Native ⚛️
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After a few months I think I owe you some small announcement. I’ve got promoted to a Head of Technology at
@callstackio
🚀
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Flutter takes the lead as the top cross-platform mobile framework worldwide! 🚀
To learn more about how Flutter can benefit your business, check out our whitepaper:
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React Conf is back!
It's the first time in-person since 2019, and this year it's co-organized by Meta and
@callstackio
. It wouldn't be possible without the amazing work of
@barbara_markie
and
@Eli_White
, who started the idea back in May 2023. Congrats on finally shipping it!
React Conf is back for 2024! Join our co-hosts
@Meta
and
@callstackio
May 15-16 in Henderson, Nevada or join the free livestream.
Sign up here for updates:
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I'm working on a new version of The Ultimate Guide to React Native Optimization 2024 Edition ✍️.
Hit me up if you'd like to contribute ideas, content or just thoughts. We want this to be a community effort!
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The future is bridgeless
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Messenger Desktop app teamed up with Microsoft to migrate from Electron to React Native on macOS and Windows. Results:
- faster startup
- lower memory usage
- smaller binary size
- less native crashes
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Running a React Native app with Fabric enabled. It's using
@reactnavigation
's NativeStack navigator, custom Fabric and TurboModule libraries, powered by the new autolinking from RN CLI. And it works! No native code is modified here.
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Upgrading experience in
@reactnative
v0.59 is about to get faster and better with "react-native upgrade" 🚀
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Daniel building React meta framework live using Nitro, which powers Nuxt 🤓
#AgentConf
@danielcroe
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I gathered a bunch of RN Optimization Guide creators to chat about the challenges of writing an ebook end-to-end, from figuring out the topics, to creating technical content, and designing the ebook itself.
Join us and ask anything 🙋♀️
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The Ultimate Guide to React Native Optimization 2023 Edition is here 🥳
It’s a significant upgrade to the original version from 2020. We’ve added 85 pages, 5 new chapters, 11 new contributors and countless edits and updates to make the content relevant for 2023.
What’s new? 🧵
The Ultimate Guide to React Native Optimization 2023 is here 🚀
We worked hard to update the ebook. It contains tips, tricks, tactics, and tools you need to optimize your React Native app!
Download the ebook for free here ⬇️
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1. Install Expo
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The latest version of React Native (0.70) now ships with this little DX improvement by
@rickhanlonii
. Showing appropriate stack frame information for a few more edge cases 🚀
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Look ma’, I made WatermelonDB 1.5x faster than MMKV in this microbenchmark. I (almost) only had to replace a 5 char long string with an 800 char one. What can we tell from it? Not much really. As stated in the original tweet, it’s only a part of the picture. A cherry-pick. 🧵
I created some Benchmarks to compare the speed of popular storage libraries for React Native. 👀
MMKV is 20x faster than AsyncStorage, and 4x faster than WatermelonDB! 🤯
(only testing simple string get speed, in debug, with hermes)
Check out the repo:
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Software Mansion is working on the State of React Native 2023 survey and they’re looking for community feedback ✅
Everyone can contribute here:
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🚨 React Native 0.73 will be the last version to support Android 5 🚨
A version that can be found on my good ol' 2012 LG G2 and in 1,4% of global users.
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It's great to see the Metro team growing and stepping up the game recently. Happy to be a part of it
#appjsconf2023
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So, we've gathered a small team focused on helping out with OSS projects we care about every week. First month planned.
Where should we focus next? 🤔
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React Native is fortunate to have its dedicated JS engine like Hermes. This team has some wild ideas that we all need and they're not afraid to pursue. Looking forward to this talk!
Give it up for our next speaker,
@tmikov
of
@Meta
! At React Native EU, he'll discuss the next generation of
@HermesEngine
, Static Hermes, and how it may redefine our interaction with React Native and shift the paradigm of JavaScript engines.
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Looks like React Native core team is finalizing the document on migrating native modules and components to TurboModules and Fabric 🥳
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Surprise surprise, React Native produces actually native apps. It's actually amazing achievement for the Messenger team to move off of Electron (with RN for particular features) 👏
Meta are setting a VERY good example for others (read: Discord) by releasing native macOS and Windows apps for Messenger and WhatsApp instead of Electron apps
of course not all companies would have the $$$ to maintain separate native apps, but Discord have more than enough
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Storybook is sleeping on React Native
Yesterday at RNCK I demoed our new React Native IDE project we developed
@swmansion
. Check out the thread for details on each specific feature from the clip
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From a bug report in
@reactnative
to a patch release fixing it in transitive dependency in under 1h 🚀. This would take _days_ prior to v0.59.
This is what we get by extracting packages out of the core to
@ReactNativeComm
, in case you wondered
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Hey
#Hacktoberfest
lovers, there's a bunch of entry-level issues in
@fbjest
waiting for you to grab!
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There's a new mobile UI testing tool released recently! Not sure I like the yaml DSL, but it looks super easy to use and works on Android and iOS. May be a nice alternative to Detox
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Remember the Ultimate Guide to React Native Optimization? We're working the 2023 revamp 🥳
Featuring some new topics on:
- performance regressions
- native profilers
- alternative bundlers
- New Architecture
Sign up for early access:
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React Native docs is looking to add Kotlin snippets next to existing Java ones and you can help 🚀
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RIP Flutter.
@kudochien
is presenting React Native renderer to SKIA at
#ReactNativeEU
I've been recently doing some work inside React Native C++ core and... well, I wish I had seen
@kudochien
talk before! Great explanation of that abstraction! 🎉
-
#ReactNativeEU
#ReactNativeEUVirtualEdition
-> visit and tune in!
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Upgrading experience of React Native is its
#1
pain point for years. We tried solving it many times, while Expo casually shipped dozens of major RN versions with only minor hiccups.
We should learn from them. This RFC is our attempt to do it. Please help us make it right!
At Callstack we're firm believers that Expo Config Plugins are a way to solve most of upgrading pains in React Native.
We're happy to present this RFC about upstreaming this idea to the React Native core 🚀
See how it would benefit the RN ecosystem🧵
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New release of React Native Testing Library is out🔥
🚀improved feature parity with
@TestingLib
family by
@mdj_dev
(more in v2 🔜)
🚀Redux & React Navigation examples and better docs by
@cross19xx
🚀querying nested text nodes by
@marchenk0va
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It's shipping week at Callstack 🚀
Today we're sharing our Super App Showcase. A ready-to-use repository setup with React Native + Re.Pack, powered by Module Federation. It has everything you need to give this super app thing a try.
We've noticed many misconceptions about super apps. To share knowledge, we compiled resources about super apps and how Callstack approaches them:
✔️step-by-step guide to super app development
✔️detailed case study and super-app-showcase
✔️demo app
Discover more here ⬇️
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So JavaScript conference now feature reinforcement learning. With
@DavidKPiano
live demoing gpt-3 feeding a state machine to get Playwright fill the multi-step form using a single prompt 👏
#AgentConf
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The React Native core team answered the top issues outlined in the 2022 community survey. Good read.
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Oskar has not only brought you the React Native visionOS. All this time he was upstreaming this work to the core of RN to improve it for all Apple platforms: iOS, iPadOS, macOS and tvOS 👏
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Autolinking for the new
@reactnative
architecture on Android is coming soon!
Let me know if you have a Fabric or TurboModule library I could test it with.
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I'm looking for experienced
#ReactNative
devs to join my team at
@callstackio
. We're remote friendly, OSS focused and fun 🙃. DM me if you're interested
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It was a blast to speak at
@appjsconf
this year. Hope you had fun and enjoyed me talking about our new lib called Reassure, now in early access preview 🥳
Photo from the super friendly
@tsapeta
, thanks!
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Szymon is a fresh React Native CLI maintainer and as a part of it he contributes missing pieces to the core framework. I’m proud to have him on my team and am sure it’s not the last time you’ll hear about his work 🚀
Today my first pull request was merged into
@reactnative
and I'm probably the youngest (16yo) ever
@reactnative
contributor! Thanks
@callstackio
for providing such opportunity!
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I’m recruiting an experienced lead engineer to build a Full-stack React team at
@callstackio
and make impact in OSS frameworks / RSC.
Interested in driving challenging problems that will help advance React ecosystem forward? My DMs are open.
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This is literally how my OSS journey have started. Almost 6 years, time flies
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My talk from
@ChainReactConf
is out 🎉
It's about how products tend to ship slower when an app grows in functionality and team size. How it's related to "super apps". And what we can do when we hit scaling limits (hint: federate!)
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And I finally met Kent after all these years in open source. He greeted me with "hey, can I give you a hug?". Gotta be the nicest guy out there 😊
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met a F1 team director Guenther Steiner today, it's a good day
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Microsoft is working on something very exciting regards standard web APIs being available for React Native apps.
via
@lord_sherlock
at
#reactnativeconn
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Met the React Forget team yesterday. Can’t wait even more before it ships
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Alright this is now my favorite change in React Native 0.71
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How is this even legal
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Expo adopted upgrade helper for bare projects that don't use Expo Prebuild (or Continuous Native Generation).
Really nice touch to acknowledge developers that are not on the happy path yet 👏
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React Native Slider introduced Fabric support 3 months ago thanks to our R&D initiatives. We wanted to make the most out of this migration—and a few following ones—and pour everything we learnt into this article.
Why it took so long? A little thread🧵
New article is out! 🎉🔥 This time it's about New Architecture in
#ReactNative
🚀
If you would like to know more about:
- What's new architecture? 🆕
- Migration of existing libraries ♻️
- Ways to speed up the process 🏎️
Check this out:
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So, what are your biggest pains in native platform debugging of React Native apps?
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Today is the Upskilling Day at
@callstackio
🎉. I was lucky to share a few updates that my team is working now and in the nearest future:
· React Native visionOS
· RNC CLI
· AI CLI + internal usage
· Full-stack React
· ...and a few redacted topics I'll share soonish :)
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I'd like to share my very first macOS with you – Twenttty 😊. If you've ever experienced blurry vision or eye strain after hours of looking at a digital screen, it's an app for you.
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How about boosting up
@GraphQL
community for the next few days? 🤔
So excited about the cooperation between
@callstackio
and
@apollographql
on that!
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We just finished the first day of the RN Core Contributors Summit 2022 happening right before the
@react_native_eu
conf 🤗
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AgentConf in Austria was the best conference experience I ever had. Insightful, inspirational, and heartwarming. Thankful to
@guntrambechtold
who runs it and
@cpojer
who pitched it to me over the years
#AgentConf
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Started The Ultimate Guide to React Native Optimization on Tour (lol that’s a long name) meetup at
@gefengallery
with a bunch of news from React and React Native.
Now time for the talk from
@adhorodyski
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