Thomas Chetwin
@tchetwin.bsky.social
JavaScript Infrastructure and Tooling at Bloomberg. Opinions are my own.
I‘ll be celebrating tonight! Part 1 of my NodeJS ambitions were merged today github.com/nodejs/node/... Now we have ZipArchive support in NodeJS
zlib: add ZIP archive support to zlib (ZipFile,ZipBuffer,ZipEntry) by pipobscure · Pull Request #64339 · nodejs/node
Summary Add ZIP archive support to the node:zlib module through three classes and a set of helpers: ZipEntry: a single archive member, with buffered reads (content()), bounded-memory streaming rea...
github.com
If you're looking for Igalians on BlueSky, there is a starter pack... go.bsky.app/LDZPFo4
new @npmx.dev timeline chart 👀 this shows the segmented view of how much the install size changed between versions, split by package (deps + self). big thanks to @graphieros.npmx.social pairing with me on this one! npmx.dev/package-time...
TypeScript 7.0 is out 🎉 It's the 10x faster Go-based port 🔥 🔷 `tsc6` is for side-by-side API access 🔷 --checkers sets checker thread count 🔷 --singleThreaded keeps parsing/emit/checking together 🔷 TS 6.0 deprecations are hard errors 🔷 API access is planned for TS 7.1
TypeScript@typescriptlang.org · 4w ago📣 The moment is here. 📣 TypeScript 7 is officially released! 7️⃣ devblogs.microsoft.com/typescript/a...
Excited to share Nav262, our experimental IDE for navigating ECMA-262 algorithms, implemented by @albertotontoni.bsky.social at the University of Bergen. Repo: github.com/bldl/nav262
GitHub - bldl/nav262: An IDE to navigate the JavaScript specification.
An IDE to navigate the JavaScript specification. Contribute to bldl/nav262 development by creating an account on GitHub.
github.com
Landed a few improvements to the error reporting for require(esm) with top-level await (behind --experimental-print-required-tla for now): - No longer need to run the code to collect the TLA locations, so it can be enabled by default soon - Added require stack and location metadata to the error
Today a number of my Investec friends ran, walked and jogged from the City of London all the way to Twickenham and I got to see everyone! It was an absolutely beautiful and kind gesture - they are amazing ❤️
Bloomberg uses a lot of C++ & contributes to the standard as well as various industry conferences and libraries. I’m looking for an experienced engineer to join a distributed systems team in New York working on our core Deployment Infrastructure for the Bloomberg Terminal 🗽 🧵
We are so moved that we got to host this fantastic crowd in our humble corner of London 🥰 Much love to @npmx.dev community 🥰
Hello friends and welcome to another “how’s ESM vs CJS doing?!” A big win this time, at a year of `require(esm)` available! 38.0% of the popular npm packages now have ESM, up from 33.4% half a year ago. ESM-only is up from 12.6% to 16.0%. Particularly this non-dual, “vanilla” growth is very big!
Today is a big day for @socket.dev. We raised a $60M Series C at a $1B valuation, led by Thrive Capital. 20,000+ orgs, 1.5M repos protected, 1,000+ supply chain attacks blocked per week. 3/5 FAANG companies are customers. We're just getting started.
Landed a set of LLDB & GDB plugins in V8 to help inspect JS states in a live process/coredump together with native states ✨ The initial implementation just supports JS stack trace annotations in bt; support for object inspection is coming up! chromium.googlesource.com/v8/v8.git/+/...
✨ New post “Vim tip: substitute pattern delimiter doesn't need to be a slash” pawelgrzybek.com/vim-tip-subs... #vim #neovim
Vim tip: substitute pattern delimiter doesn't need to be a slash | pawelgrzybek.com
Did you know that slash is not the only valid pattern delimiter? How many times in the past have you escaped all the slashes in the URL or file path?
pawelgrzybek.com
performance.now() 2026 is coming. Ticket sales will open in May with cheap and ultra-cheap early bird tickets. These will be announced in our newsletter first. So subscribe via perfnow.nl/subscribe perfnow.nl
performance.now(); 19th and 20th of November 2026, Amsterdam
On 19th and 20th of November 2026, the seventh edition of performance.now() will take place in Amsterdam—a single track conference, covering today’s most important web performance insights.
perfnow.nl
Have you ever scanned a dirty or crumpled up QR code, *certain* it wouldn't work, and then it instantly does? They're built to be really resilient! Here's a guide I put together, full of interactive visuals to show the design choices in the QR spec. perthirtysix.com/how-the-heck-do-qr-codes-work
How The Heck Do QR Codes Work? (An Interactive Exploration)
Interactively dive into the layout and encoding of QR codes
perthirtysix.com
Had a blast in London! Thanks @tchetwin.bsky.social, @legendecas.bsky.social and many volunteering Bloombergers for organising a great Node.js collab summit 😇 This was one of the most attended summits I’ve been to, so didn’t get to say hi to everyone, but very happy to see many new faces!
The recording of @jason-williams.co.uk talk ‘Temporal: It’s about time!’ is now available to watch online! 2026.stateofthebrowser.com/speaker/jaso... And Temporal has reached Stage 4: www.igalia.com/2026/03/13/T...
Temporal is now Stage 4 at TC39 🎂🎂🎂 Thanks to all the other champions of JavaScript's new date-time API. It has been a wild ride over many years! I wrote a blog post explaining how we got here 📜 bloomberg.github.io/js-blog/post...
![Code example showing the usage of Temporal.ZoneddateTime
```js
// London DST starts: 2026-03-29 01:00 -> 02:00
const zdt = Temporal.ZonedDateTime.from(
"2026-03-29T00:30:00+00:00[Europe/London]",
);
console.log(zdt.toString());
// → "2026-03-29T00:30:00+00:00[Europe/London]"
const plus1h = zdt.add({ hours: 1 });
console.log(plus1h.toString());
// "2026-03-29T02:30:00+01:00[Europe/London]" (01:30 doesn't exist)
```](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:r5emt2gkdrkb2yc6y7xndxpe/bafkreicgonzisednk3qegophndqf6fnslwtvbd7gshsgtv6fpi3arh2dsi)
bloomberg.github.io/js-blog/post...
Source Maps: Shipping Features Through Standards
Source maps are a vital part of modern web development, but a lack of standard has made it impossible for us to add new features or improve the debugging experience. This is the story of how we standa...
bloomberg.github.io
Some time ago, @jonkuperman.com & @tchetwin.bsky.social had a dream for the JS engineers at Bloomberg to be more public about the cool JS work we have going on. That dream has come true - now we have a blog platform 🎉 (You'll see more articles over the next few days) bloomberg.github.io/js-blog/
Bloomberg JS Blog
The official Bloomberg JavaScript blog - insights, tutorials, and best practices from Bloomberg's JavaScript engineering team.
bloomberg.github.io
For those who were not in London today for State of the Browser 2026 conference, Josh relays @jason-williams.co.uk's talk!
Josh Tumath@joshtumath.uk · 5mo agoNext is my former colleague @jason-williams.co.uk now working at Bloomberg but does a lot of work in JavaScript standards. Been in the TC39 committee who work on ECMAScript. #SotB26
It took a while, but the State of JS 2025 survey results are now live! 2025.stateofjs.com/en-US Thanks to @danielroe.dev for contributing the conclusion.
State of JavaScript 2025
The 2025 edition of the annual survey about the latest trends in the JavaScript ecosystem.
2025.stateofjs.com
here's a brief look ahead at what we have planned in the e18e community for 2026 🎉 great collaborations, and many useful developer tools are in the works. also a huge thanks to all who contributed so far - many of the libraries, tools, and frameworks we use today are faster because of you 💙
The Year Ahead (2026)
A look ahead at what's coming in 2026 for the e18e community
e18e.dev
Can’t wait for the first @e18e.dev and friends edition! ✨ Honored to host the show 🙌🏻
e18e@e18e.dev · 6mo agoexciting news! we're starting a new monthly live streamed show: e18e & friends. hosted by the great @thealexlichter.com! monthly we will catch up with friends from the community, with a focus on performance and what cool things they've been building lately first guest TBA soon, streaming 10 Feb 🎉
Your TypeScript year in review You "silenced" 417 errors with `as any` that turned into runtime errors as soon as the code ran TypeScript printed 4,693 error messages. 26 of them made sense You spent 98 minutes waiting for tsc to run. During this time you spent 544 minutes reading social media
this fall I worked with the core Git folks on writing an official data model for Git and it just got merged! I learned a few new things from writing it. github.com/git/git/blob...
git/Documentation/gitdatamodel.adoc at master · git/git
Git Source Code Mirror - This is a publish-only repository but pull requests can be turned into patches to the mailing list via GitGitGadget (https://gitgitgadget.github.io/). Please follow Documen...
github.com
Thanks @mmocny.com for the container timing shoutout and stealing my low effort diagram 😂 Great talk @ #perfnow
Missed #JSConf 2025? No worries, we’ve got you. 🎬 All the talks are now on YouTube. Watch them here: hubs.la/Q03PNmCK0
Stalled this PR for almost a year due to CI build cache issues, last week I realized (once again?) the Linux binary size is a bit out of hands and gave the CI another try, and the CI miraculously handled it , so finally landed this and shed of 8MB off the binaries at least github.com/nodejs/node/...
build: build v8 with -fvisibility=hidden -fvisibility-inlines-hidden by joyeecheung · Pull Request #56290 · nodejs/node
Split from #56275 since it seems to cause gcc on some machines in the CI to time out or run out of memory. Trying to see if it's just a CI hiccup or if it's something that needs to be worke...
github.com
