Maciej Jastrzębski @mdj_dev
React Native at @callstackio — OSS: RN Testing Library — team console.log mdj.hashnode.dev Wroclaw, Poland Joined April 2020-
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React Native Testing Library v14.1.0 is out 🎉 Changes: 🔹 userEvent.pullToRefresh() 🔹 userEvent.accessibilityAction() 🔹fireEvent.layout() 🔹eventDiagnostics option: warns when an event calls no handler ... and RN 0.88 & React 19.3 support ✅
@Atlantisxd even more cool stuff coming soon 🔜
@OrphanPid I guess you can turn it into failure by using something like this: stackoverflow.com/questions/2861…
@OrphanPid it a warning mechanism that tells if you when no event handler matched the fireEvent / userEvent calls or if some matched but did not fire because it was disabled.
GH Release: github.com/callstack/reac…
The growth in the last year is 5x(!) So seems mostly agent-driven, but at least the code is well tested 😀
Rect Native Testing Library recently passed 5M weekly downloads on npm 🎉 At the same time v14 already makes up over 30% of them and keeps growing 🚀 Working on some new features, more soon... 👀
Maciej Jastrzębski retweeted
Introducing e2e The agentic testing framework for any app ~/ npx e2e init → Fully Open Source → Mix deterministic and agentic APIs → Supports web, mobile, and more → Bring your own agent and infrastructure → Run locally or in CI tester.army/e2e
@sethwebster @barbara_markie Wow 🔥 Huge win for the whole React Foundation! Congrats @barbara_markie !
Maciej Jastrzębski retweeted
This Week In React 299 ⚛️ - Panda - Vinext - Next.js - Preact - Design Systems - RTK 📱 - Variable Font - Activity Result - Lynx - Lucent - macOS - Plain Text - RNav - Angular Native 🍿 Read: thisweekinreact.com/newsletter/299 ✍️ @jaworek3211 & I
@charles_maddock removed node modules?
RN Plain Text now runs visual regression tests every night to keep the output pixel-perfect-stable 🔬 Kudos to @trozee_dev for cooking this!
Pixel-perfect UI should not be vibe-coded Together with @mdj_dev we added visual regression testing support to RN PlainText 🎉 The new VRT suite captures and pixel-compares nearly 200 Android and iOS specimens in CI every night 🌚 More in comments 👇
@benmodev Nested Text can be detected by unstable_TextAncestorContext from RN having true value. Take look here: github.com/mdjastrzebski/…
RN PlainText 0.9 is out ✨ Even faster rendering, even better compatibility, and the big one: a drop-in replacement for RN <Text>. Want to try it in your app? Just change one import and feel the perf difference!
Plot twist: this is how Android foldables finally get proper layout support, thanks to the iPhone Duo launch and @thiagobrez 😄
I'm finalizing Android support react-native-arrangement-view 🤖 Docs will include comparisons between iOS and Android in all poses and orientations, which I think it's pretty nice Screenshots taken with @agent_device obviously
@salisedesign and for nested text, it falls back to RN Text, so you get the same perf as today
@salisedesign It's built to be highly optimized for the single-style case hot path. In our benchmarks it performs essentially the same as PlainText in those cases (~1% difference), so ~30% faster than RN Text. You can check it yourself with the benchmark suite in the example app in the repo.
Exactly! This way 80-90% of your text renders with the fast, light PlainText, and RN Text handles the remaining 10-20% where you need its flexibility. I've also made sure the drop-in Text is perf-optimized itself, so for single-style text it performs essentially the same as using PlainText directly.
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