@chicoxyzzy

@TC39 Invited Expert. WebKit committer. Striving to bring #WebAssembly to your web browser. Working on runtimes, standards, developer tools, and observabilty.

 Barcelona
sergey.works
Joined December 2014
  • Tweets5.2K
  • Following1.2K
  • Followers3K
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I got a GitHub notification with review comments, addressed them, and pushed a commit. Only then did I realize that neither the PR nor the initial commit was mine. I really need to get more sleep 😅
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Is there a path to becoming a member of the Web Platform Tests organization (github.com/web-platform-test…)? I'd love to contribute more to the Wasm tests, both by writing code and reviewing PRs.

web-platform-tests

web-platform-tests has 25 repositories available. Follow their code on GitHub.

github.com
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I’m working closely with WebAssembly proposal champions and on Wasm support in WebKit. We could keep these tests WebKit-specific, but upstreaming them to WPT is much more valuable: it improves interoperability and benefits the web platform as a whole.
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I’d appreciate it if someone could review my open WPT PRs: github.com/web-platform-test… I’d also be happy to add more Wasm tests to help improve coverage in WPT.

Pull requests · web-platform-tests/wpt

Test suites for Web platform specs — including WHATWG, W3C, and others - Pull requests · web-platform-tests/wpt

github.com
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Whaaaaat, this is so cool 🤯 Alyona turned website loading into music — so you can not only see the threads, but actually hear them!
Workafrolic (±∞)@ABatickayaSep 25
Превратила загрузку сайта в музыку. Чтобы треды можно было не только видеть, но и слышать. Некоторые сайты превращаются отличный трек, который можно зациклить и работать под него. blog.alena.rocks/artifacts/p…
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I'm officially a @webkit committer. Thank you to the JavaScriptCore reviewers. github.com/WebKit/WebKit/pul…

Give Sergey Rubanov committer status by chicoxyzzy · Pull Request #73034 · WebKit/WebKit

12cdd85 Give Sergey Rubanov committer status Reviewed by Pascoe. Give me committer status. * metadata/contributors.json: Canonical link: https://commits.webkit.org/320330@main 028780e Misc...

github.com
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Sergey Rubanov retweeted
sosuke@__sosukesuzukiAug 25
We’ve upstreamed JIT compilation for lookbehind assertion to @webkit as part of this optimization! Expect faster RegExp in Safari soon 🚀
Bun
@bunjavascriptAug 12
In the next version of Bun RegExp gets up to 281x faster
Dark benchmark card titled "RegExp in Bun". Top right, struck through: the GitHub issue title "Node.js is 300× faster than Bun at isbot regexp" (oven-sh/bun#5197, closed). Huge headline: "281× faster on the isbot regex." Subtext: "110 alternatives, four lookbehinds, 263,487 real user-agent strings. Same script, same machine." Three horizontal bars, drawn to scale, lower is better: Bun v1.3.14 (before) 32,395 ms — spans the full width; Node.js v26 (V8/Irregexp) 141 ms — a thin sliver; Bun v1.4 (after) 115 ms — an even thinner pink sliver. Footer: Apple Silicon, benchmark from github.com/quick-lint/bun-vs-node; improvements: JIT-compiled lookbehinds, alternation dispatch, prefix factoring, wider Boyer-Moore search. The isbot regex source is faintly visible as background texture.

ALT Dark benchmark card titled "RegExp in Bun". Top right, struck through: the GitHub issue title "Node.js is 300× faster than Bun at isbot regexp" (oven-sh/bun#5197, closed). Huge headline: "281× faster on the isbot regex." Subtext: "110 alternatives, four lookbehinds, 263,487 real user-agent strings. Same script, same machine." Three horizontal bars, drawn to scale, lower is better: Bun v1.3.14 (before) 32,395 ms — spans the full width; Node.js v26 (V8/Irregexp) 141 ms — a thin sliver; Bun v1.4 (after) 115 ms — an even thinner pink sliver. Footer: Apple Silicon, benchmark from github.com/quick-lint/bun-vs-node; improvements: JIT-compiled lookbehinds, alternation dispatch, prefix factoring, wider Boyer-Moore search. The isbot regex source is faintly visible as background texture.

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Anyone from Web Platform Tests around? Looking for a contact who can help land two small #WebAssembly WPT bug fixes — they flake / false-fail WebKit CI. Both green, just waiting on review. github.com/web-platform-test… github.com/web-platform-test…
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Hi! I’m working on improving #WebAssembly support in JavaScriptCore, the JS/Wasm engine used by @webkit / Safari and @bunjavascript If you run into any issues or bugs, please file a report: bugs.webkit.org/enter_bug.cg… or message me.
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me: I'll just make array destructuring spec-compliant, should be slower but correct the measurement: it's 5x faster actually me: what the profiler: the wrong code was doing more work me: WHAT
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Wonder is getting better. Wil be open sourced soon
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🙏 Glad it’s been useful! The TC39 MCP works both over HTTP and via local stdio. The latter can save you some tokens. mcp.xyzzylabs.ai/tc39/

tc39-mcp

Structured MCP server for the TC39 specs.

mcp.xyzzylabs.ai
Johannes Stein
@frostney_Jul 20
Replying to @chicoxyzzy
@chicoxyzzy Big props on the TC39 MCP! It has saved me so much time and effort and back and forth with AI agents.
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The source code also includes everything you need to deploy and host your own TC39 MCP on Cloudflare Workers.
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The secret project I'm working on is Wonder — a from-scratch JS runtime built for the edge. The cold-start is 5ms. Node takes 64ms. Even Cloudflare's workerd takes 25ms. 4.8MB per worker (node: 80MB), ~110KB per isolate. Frozen primordials, no eval — secure by construction.
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I'm also going to port some parts of the Wonder design to Cynic (github.com/chicoxyzzy/cynic) and Wonder learns from Cynic too.

GitHub - chicoxyzzy/cynic: A strict-only ECMAScript engine, written from scratch.

A strict-only ECMAScript engine, written from scratch. - chicoxyzzy/cynic

github.com
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If you want Cynic numbers: github.com/chicoxyzzy/cynic/… I'm currently working on closing the gaps on the interpreter-only macro benchmarks. Ohaimark (tier 2 JIT) is next on the on the deck.

cynic/bench-cross-results.md at main · chicoxyzzy/cynic

A strict-only ECMAScript engine, written from scratch. - chicoxyzzy/cynic

github.com
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Still working on Cynic, plus another experimental JS engine/runtime in a private repo and it's showing incredible results! Since yesterday, I’m back contributing to WebKit’s JavaScriptCore: one Wasm fix has landed, more on the way. My JS engine obsession is now multithreaded.
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Sergey Rubanov retweeted
Anders Hejlsberg@ahejlsbergJul 8
Huge milestone for our team today: TypeScript 7 is now generally available--a native port that runs 10x faster. @typescript devblogs.microsoft.com/types…

Announcing TypeScript 7.0 - TypeScript

Today we are proud to announce the availability of TypeScript 7, a 10x faster native port of TypeScript! Since its early days, TypeScript has promised to

devblogs.microsoft.com
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