@mkrl__

UX / Developer Experience engineer, unpublished author. Hosting @warsawjs for your pleasure!

 Warsaw, Poland
mkrl.xyz
Joined October 2010
  • Tweets350
  • Following342
  • Followers305
85Media
me at 21
Faris Aziz@farisaziz12Sep 28
Me at 21
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I always wanted to recompile a browser and make arrays start at 1 to see how the web breaks. While an entire browser is a bit too much work, a compact JS engine is pretty doable. Meet Qu1ckJS - a JS engine where indexed collections start at 1!
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Wasm REPL: mkrl.xyz/qu1ckjs Thanks to how portable the original QuickJS is (and to the modern C tooling brought in by quickjs-ng) it turned into a fun weekend project. Get the cursed binaries here: github.com/mkrl/qu1ckjs/rele…
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Turns out you can fit an entire snake game into a single <div> with CSS border-shape
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Browser support is @googlechrome-based only for now, but there's hope give it a try here mkrl.xyz/border-snake
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My conference tech demo accidentally turned into capturing.website I always wanted to build a full-featured screen recorder based purely on web standards. Turns out, you can fit recording, processing and encoding in under 200kb (probably could have pushed it even lower).
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It started with playing around with html-in-canvas, however the end product contains none at all. Videos are directly saved into a local folder (or OPFS for Firefox and Safari). Encode into a bunch of cool formats with WebCodecs! There's even a floating recording window.
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Just went to report a bug in @voidzerodev formatter. Spent 30 minutes setting up a classic reproduction repo. Then discovered playground.oxc.rs has an option to compare with prettier and if there's a difference IT FILLS OUT THE ISSUE TEMPLATE FOR YOU I absolutely love it
a screenshot from playground.oxc.rs displaying oxfmt and prettier output side by side. there's a button that says "report diff" because the outputs are different

ALT a screenshot from playground.oxc.rs displaying oxfmt and prettier output side by side. there's a button that says "report diff" because the outputs are different

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spent 6 months trying to figure out pricing for my developer products: per-seat, usage based, "contact sales"? introducing promise-based billing. honestly IMO it's the most honest pricing model in tech: - generous free tier for sync APIs - real customers pay for promises
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Listen to us yap about human connection and conferences!
Tejas Kumar
@TejasKumar_Feb 16
NEW on ConTejas Code: @mkrl__ talks about how to ◆ Expand your network ◆ Speak at conferences ◆ Find a job in this economy Other platforms in reply. xitter.cf/tejask/status/20208318…

ConTejas Code | Mikhail Korolev

A discussion about how to navigate the job market, grow your network, and speak at conferences.

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As a child growing up in a post-soviet country I had a recurring nightmare of getting lost in a maze of eastern bloc buildings. A while ago I got to play Townscaper by @OskSta and had an idea "what if I make one, but depressing?". Quick @threejs prototype scratches the itch.
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Perfect! Let's check one more time just to be sure! Just one more time bro I promise.
A Github Copilot agent chat window with endless "The file looks good, let's run one more check" calls to run a script in terminal.

ALT A Github Copilot agent chat window with endless "The file looks good, let's run one more check" calls to run a script in terminal.

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I just wanted to say you folks did an incredible job with the home-grown CFP and submission system. I remember @farisaziz12 told me about this during @what_the_stack, and I just had the pleasure to use it myself. Maybe see you in Zurich? 👀
Faris Aziz@farisaziz12Jan 1
Happy new year! The ZurichJS Conf CFP is officially live: conf.zurichjs.com/cfp And we’ve revealed our first speaker 👀 conf.zurichjs.com Early birds are on! 🦅

Call for Papers | ZurichJS Conf 2026 | ZurichJS Conf 2026

Submit your talk proposal for ZurichJS Conf 2026. We're looking for lightning talks, standard talks, and workshops on JavaScript, TypeScript, and web development.

conf.zurichjs.com
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2026 goals: ship a thick snowman to production ✅
an almost anatomically correct snowman with a big butt, viewed from behind

ALT an almost anatomically correct snowman with a big butt, viewed from behind

an almost anatomically correct snowman resembling a muscular man with a big nose and a moustache

ALT an almost anatomically correct snowman resembling a muscular man with a big nose and a moustache

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vibe talking
Daniel Afonso
@danieljcafonso18 Sep 2025
What is stopping you from doing talks like this? @mkrl__ @what_the_stack
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Today I had one of those dreams when you wake up and write your genius idea down. my notes: - hypothetical assertions in @vitest_dev - expect(n).toWouldHaveBeenCalled - expect(n).toMayHaveBeenCalled in my mind this was revolutionary: unlocking branching reality timeline API
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Most average Angular talk in Poland @warsawjs
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you: vibecode the next billion $$$ saas with claude opus 4 max 20x me: javascript event loop book for kids with gemini g.co/gemini/share/d06dcc5e75…
A book page that has text: "But what if Callie was busy baking a big cake (a long-running task on her Call Stack), and a tiny note arrived saying, 'Quick! Add a pinch of salt!'? Manny knew this was a microtask, so he'd give that tiny note to Speedy Sam for his urgent queue."

ALT A book page that has text: "But what if Callie was busy baking a big cake (a long-running task on her Call Stack), and a tiny note arrived saying, 'Quick! Add a pinch of salt!'? Manny knew this was a microtask, so he'd give that tiny note to Speedy Sam for his urgent queue."

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I have accidentally created the most uncomfortable notification stack known to man 😭 Still looks cool because of the view transitions though.
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Just arrived to @code_europe. They did me dirty with the badge 😭
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