Jamie Birch@birch_js

Cross-platform engineer trying to make native app dev as pleasant as web dev

 Tokyo-to, Japan
github.com/shirakaba
Joined June 2017
2,493 Photos and videos
Pretty surreal to see @theo covering my article! I caught it live, so can assure it was a fun watch from my point of view. 🍿 Theo also caught the fact that React Native deploys to e-ink Kindles and PlayStations, which I overlooked! Tempted to add those to the addendum now 😄
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I think everyone's sleeping on Welsh for SaaS naming ❌ Cloudflare Workers 🇺🇸 ✅ Fflachcwmwl Gweithwyr 🏴󠁧󠁢󠁷󠁬󠁳󠁿
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Jamie Birch retweeted
Oliver Medhurst
@CanadaHonk
Oct 2
ty for nerdsnipe. in the next version of Porffor, coroutines are now stackless resulting in async and generator microbenchmarks up to 24x faster and using up to 36x less memory!! (yes times not percent)
generators & async, time 25k concurrent async 4605 → 191 (24.1x) 2M short-lived generators 1226 → 137 (8.9x) for-of over generator 1419 → 203 (7.0x) spread + yield* 882 → 167 (5.3x) 5000-deep async chain 122 → 29 (4.2x)

ALT generators & async, time 25k concurrent async 4605 → 191 (24.1x) 2M short-lived generators 1226 → 137 (8.9x) for-of over generator 1419 → 203 (7.0x) spread + yield* 882 → 167 (5.3x) 5000-deep async chain 122 → 29 (4.2x)

meghdip karmakar@MeghdipKarmakar
Sep 29
Replying to @CanadaHonk @richiemcilroy @cap
what about async? it compiles to stackless coroutines? and do we provide our runner based on epoll or something? or it's linking with libuv?
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Jamie Birch retweeted
William Candillon@wcandillon
Oct 2
We are releasing React Native Skia version 3.0 which runs WebGPU by default. By moving away from the OpenGL-centric design, it allows for multithreading by default as well as deep integration with three.js, vision camera, and transformer.js piped.video/watch?v=L-PNQi1n…
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Introducing Mobile Dev: full mobile dev tooling right in your Codex app ✨
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Gave up my seat on a packed train to a pregnant woman 🙂 Some motherfucker sweeps in and steals it before she can sit down 🙃
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Doesn't matter how smart your agent is, we all have to wait ten minutes for Gradle to sync
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So tired of how bad Android Studio is at debugging code on-device. Usually takes me 30 minutes to get a debugger attached. Constant resyncing the Gradle project, waiting for loading spinners, and watching the debugger connection time out. Just over and over again.
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Jamie Birch retweeted
Sindre Sorhus
@sindresorhus
Oct 1
Due to AI, I have disabled external pull requests on all my repos. Open source, as we have known it, was fun while it lasted. (It’s been 15 years for me) I will still maintain projects and handle issues.
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* for English only
Manan Gupta
@yoitsmanan
Sep 29
Introducing Phonon-2: a new standard in speech recognition per byte. At just a tiny 164MB download, it is more accurate on average than OpenAI's Whisper large ( a model 10X its size) Transcribe an hour of audio in just 20 seconds on a MacBook Air! Open weights, CC-BY-4.0, today. @fermion_ai
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React Native macOS 0.83 is here! 🥳 I'll be able to ship Expo Desktop starter templates based on newer React Native versions thanks to this. Thanks, Saad!
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Most of my experience of debugging Swift with Xcode has been watching perpetual loading spinners and being unable to get any useful information about most symbols even once loaded. Developer experience is a major reason I got into NativeScript!
NativeScript
@NativeScript
Sep 30
Breakpoint Swift with Chrome DevTools? You bet.
Breakpoint debugging Swift with Chrome DevTools.

ALT Breakpoint debugging Swift with Chrome DevTools.

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Angular Native is cool and all, but I'd rather write React Native apps using vanilla JS. One-shotted by Astra in 34 minutes
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Please do not actually develop apps like this github.com/shirakaba/react-n…

GitHub - shirakaba/react-native-imperative: Control React Native via vanilla JS

Control React Native via vanilla JS. Contribute to shirakaba/react-native-imperative development by creating an account on GitHub.

github.com
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Jamie Birch retweeted
Oliver Medhurst
@CanadaHonk
Sep 29
upm ahead-of-time compiled with Porffor! - ~4mb native binary - up to 50% faster than Node version with only ~15 minutes spent optimizing - identical source code (only node shims needed)
honk@gosling upm % file upm upm: Mach-O 64-bit executable arm64 honk@gosling upm % du -h upm 3.8M upm honk@gosling upm % ./upm --help | head -n5 upm — a minimal npm-compatible package manager Usage upm install [--production] [--frozen-lockfile] [--verify] (also i; ci is frozen) upm add <spec>... [--dev | --optional] [--exact] [-w <workspace>] honk@gosling upm % rm -rf ~/.upm/ honk@gosling upm % ./upm add next express nitro upm: + next@^16.3.6 in dependencies upm: + express@^5.2.1 in dependencies upm: + nitro@^3.0.260903-beta in dependencies 108 packages (+46 for other platforms) 108 entries (0 reused) 12212 linked, 0 copied 12 bins 6.21s

ALT honk@gosling upm % file upm upm: Mach-O 64-bit executable arm64 honk@gosling upm % du -h upm 3.8M upm honk@gosling upm % ./upm --help | head -n5 upm — a minimal npm-compatible package manager Usage upm install [--production] [--frozen-lockfile] [--verify] (also i; ci is frozen) upm add <spec>... [--dev | --optional] [--exact] [-w <workspace>] honk@gosling upm % rm -rf ~/.upm/ honk@gosling upm % ./upm add next express nitro upm: + next@^16.3.6 in dependencies upm: + express@^5.2.1 in dependencies upm: + nitro@^3.0.260903-beta in dependencies 108 packages (+46 for other platforms) 108 entries (0 reused) 12212 linked, 0 copied 12 bins 6.21s

Pooya Parsa 🐑
@_pi0_
Sep 27
Introducing 📦upm: 🪶A fast, tiny package manager for the npm registry. ✨Written in TypeScript, it installs at native-class speed and has a JS API, at a fraction of the size of native tools. 🤝Compatible with your existing .npmrc and lockfiles. 👉 Try at upm [dot] sh
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There was a success rate of just 30% in my batch when applying for permanent residency in Japan. For 19 months, I waited for my application to be processed, without a single status update, worrying that they’d reject it for some paperwork slip-up.
Dennis デニス@Dizzydennis
Sep 29
After months of preparation and waiting, I was given a letter from the Japanese government about my permanent residency. Unfortunately, it has been nothing more than a rude wake up call and a reminder of what I am here. I vented my thoughts out in this post. It's a tough day.
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Jamie Birch retweeted
Oliver Medhurst
@CanadaHonk
Sep 29
cool take for ahead-of-time JS! basically just the runtime but running the JIT at build-time with type information. limited payoff and have to fight the engine but easy compatibility. it's an interesting middle ground.
Jarred Sumner
@jarredsumner
Sep 29
An early preview of experimental Bun + JSC with ahead-of-time compilation For Claude Code's CLI: 24% faster startup, 48% lower memory, 46% lower CPU, and nearly 2x larger binary size
Bun AoT VS Bun JIT Claude Code, same source, same 5-turn session. AoT runs with the JIT off. Time to interactive 165 ms 216 ms -24% Wall time launch + 5 turns 322 ms 529 ms -39% CPU time Memory at interactive 395 ms 738 ms -46% 56 MB 108 MB -48% Memory after 5 turns 82 MB 159 MB -48% 101 MB Peak memory Executable size target: +100 MB at most 194 MB -48% 430 MB 229 MB +88% Early prototype, macoS arm64. Medians of 8 runs against a fake API server on one MacBook Pro. Memory is phys_footprint. CPU is user + system, all threads. Turns in the JIT build are not CPU bound, so part of the wall time gap is waiting. 28 Sep 2026.

ALT Bun AoT VS Bun JIT Claude Code, same source, same 5-turn session. AoT runs with the JIT off. Time to interactive 165 ms 216 ms -24% Wall time launch + 5 turns 322 ms 529 ms -39% CPU time Memory at interactive 395 ms 738 ms -46% 56 MB 108 MB -48% Memory after 5 turns 82 MB 159 MB -48% 101 MB Peak memory Executable size target: +100 MB at most 194 MB -48% 430 MB 229 MB +88% Early prototype, macoS arm64. Medians of 8 runs against a fake API server on one MacBook Pro. Memory is phys_footprint. CPU is user + system, all threads. Turns in the JIT build are not CPU bound, so part of the wall time gap is waiting. 28 Sep 2026.

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なかざん
@Nkzn
Sep 29
今夜はこちらにお邪魔します React Native Meetup #25 @マイベスト react-native-meetup.connpass… #ReactNativeJP

React Native Meetup #25 @マイベスト (2026/09/29 19:00〜)

# React Native Meetup #25 @マイベスト ## イベントの概要 / Overview React Native に関する知見を共有するLT会の第25回を開催します！ 発表は日本語で行われます。 * * * ## LT登壇者を募集します！ / Calling for LP Speakers! * 内容はReact Nativeに関することならなんでもOKです *...

react-native-meetup.connpass.com
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Unseen Japan@UnseenJapanSite
Sep 28
It's rumored that only around six non-native speakers from outside the kanji-using world have passed Level 1 of Japan's Kanji Kentei. One is Bret Mayer, an American translator and kanji instructor in Hamamatsu who got hooked on Japanese via Dragon Ball. buff.ly/iMzYdDZ
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I started out a decade ago developing my hobby iOS apps using Swift + UIKit. UIKit and Xcode were such a pain to develop in that I turned to React Native simply to improve the developer experience. Yes, I use cross-platform frameworks even for single-platform apps.
Mo
@atmoio
Sep 27
Humans were so bad at coding that companies had to use React Native because two native apps was just..too much. It was too much.
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get on your knees
axhiii
@axhiii88547
Sep 25
Be honest: what was your first code editor?
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