I'm pleased that this year's GitHub survey acknowledges that untyped & typed JavaScript deserve to be counted as part of the same ecosystem. 🔶 New repos (last 12 months): JS 9.3M, Python 9.3M, TS 5.4M 🔶 Contributor delta (last 12 months): TS +1.1M, Python +0.9M, JS +0.4M 🔶 Contributor count chart

Big news in this year's GitHub Octoverse report: TypeScript is now the most-used language on GitHub! We are thrilled and grateful to see the TypeScript and JavaScript community continue to grow and thrive. 🚀 Read up more at github.blog/news-insight...

We are still looking for feedback on tsgo, but it is worth calling out we expect some type-checking changes that you may need to adapt to. The native previews are easy to grab from npm, and are published nightly to try out! www.npmjs.com/package/@typ...

ECMAScript excitement 😉 @jason-williams.co.uk from TechAtBloomberg announces the release of Boa's Rust-based implementation of TC39 Stage 3 Temporal 🎉 Chrome estimates this will ship in Chromium 143 🎉🎉 Temporal is the shiny replacement for the broken JS Date API ✨

🚀 v1.104 of VS Code is here! Check out what's new: 🤖 Improved coding agent integration 📄 AGENTS.md file support for better context 🔍 New Auto mode (Preview) for smart model selection 🔑 Model flexibility via BYOK extension API …and more: aka.ms/VSCodeRelease Here are the highlights 🧵

@robpalmer.bsky.social makes a good point - `--strict`-by-default isn't the only thing to expect in TypeScript 6.0. We're trying to adopt better defaults and simplify for the future. Check out the current plans on our milestone: github.com/microsoft/Ty...

TypeScript excitement 😉 TS 6.0 is planning a bunch of breaking changes to tsconfig options to deprecate some and change the defaults for others. This will simplify configuration and ease the transition to the Go-based TS 7.0 👍 The latest pitch is to enable strict type-checking modes by default 🎉

Just filed an issue to turn `--strict` on by default in TypeScript. Maybe it's a little bit ambitious, but I'm excited for us to try this one. 😄 github.com/microsoft/Ty...

Tonight will be one of the best nightlies of the TypeScript Native Preview ever. 1) @andrewbran.ch fully rewrote the language server infra into a snapshot model. No more data races. It's so cool 2) Sheetal added build mode (-b), and it's even _concurrent_ build mode. 10x+ on dt-tools, hot and cold

It's easy to miss a key feature of Node's TypeScript support that was released on Friday: it's zero config 💥 Meaning you don't need to put anything in package.json. Strictly speaking you don't even need a tsconfig to run the code. nodejs.org/en/blog/rele...

Node excitement 😉 Congrats to @marcoippolito.dev on today's landmark Node 22.18 release. It is the first LTS release to ship unflagged TypeScript support 🎉 This means Node can run *.ts files. It pairs well with TypeScript's "erasableSyntaxOnly" flag 👍 Many folk contributed 🙏

TypeScript excitement 😉 TS 5.9 is out 🎉 🔶 `import defer` by @nicr.dev 🔶 module: "node20" for require(ESM) 🔷 --init has modern defaults (no downleveling) 🔷 Docs: Inline summaries for DOM APIs 🔷 IDE: Expandable hovers to drill into Quick Infos 🔷 Perf: Faster type instantiation & file existence

TypeScript 5.9 is now available! 📣 This release brings: ✅ An updated tsc --init ✅ Type-checking for the new 'import defer' ✅ Actual summaries in more DOM APIs ✅ Expandable quick info hovers (✨preview✨) and more! Read up more on our blog: devblogs.microsoft.com/typescript/a...

🚀 v1.102 of VS Code is here! Check out what’s new: - MCP is GA with GitHub policy support - GitHub Copilot Chat is open source - Use custom modes for tailored chat - Background task management with Copilot coding agent …and so much more: aka.ms/VSCodeRelease 🧶 Here are some of the highlights…

🔥 I have news! After a 1y hiatus, I’m once again leading this year’s #StateOfHTML survey, thanks to generous funding by Google. ❤️ 🙋🏽‍♀️ Is there is an HTML feature or Web API you're dying to see progress on? Suggest it and it could be included! [1/2] lea.verou.me/blog/2025/de...

TypeScript 5.9 Beta just went out! Try it in your project and let us know what you think: devblogs.microsoft.com/typescript/a...

Last month, we announced plans to open source the GitHub Copilot Chat extension. Today, we've reached that milestone. Let's build the future of software development together: aka.ms/oss-ai-editor

Slack now runs the new Go-powered @typescriptlang.org checker in CI. Using the tool saves us over 5 minutes per run, meaning faster merges and happier developers. Huge thanks to Anders, @jakebailey.dev, and everyone else on the project for the incredible performance gains.

TypeScript excitement 😉 Congrats to @searyanc.dev on landing big updates to the default tsconfig settings used by `tsc --init` 🎉 Defaults matter - and in TS 5.9 they embrace simplicity 💙 🔷 ESM (was CommonJS) 🔷 No down-leveling (was ES2016) 🔷 verbatimModuleSyntax: true github.com/microsoft/Ty...

You're telling me a duck typed this code?

Why do the subways in Paris have to make that awful horror-movie-style synth sound?

📝 Typed Linting with Project Service In typescript-eslint 8.0, we stabilized a parserOptions.projectService option that uses powerful, streamlined TypeScript APIs for typed linting. Let's talk about why that's simpler and often faster than what came before. typescript-eslint.io/blog/project...

This post was first drafted as a PR in December 2023. We've been wanting to talk about the new Project Service option for typed linting for *ages*. 🙌

And now for something completely different:

ECMAScript excitement 😉 Firefox 139 ships the TC39 Stage 3 Temporal proposal 🎉 It's about time. Congrats to those who worked on the implementation including Andre Bargull & Dan Minor 👍 developer.mozilla.org/en-US/docs/M...

Trying to collect some data: what package that you know/maintain have transitioned to shipping ESM-only/ESM-first after it's unblocked by the support of require(esm)? Any tips/experiences to share?

ECMAScript excitement 😉 Congrats to champion JS Choi on conditionally advancing TC39 proposal Array.fromAsync to Stage 4 at TC39 today 🎉 It's like Array.from & works with async iterators. It's like the npm pkg it-all. It eliminates needing an adhoc for-await-of loop 👍 github.com/tc39/proposa...

ECMAScript excitement 😉 Congrats to @chronicles.org on conditionally advancing Explicit Resource Management to Stage 4 at TC39 today 🎉 It introduces `using` declarations and the Symbol.dispose protocol to deterministically and ergonomically release resources 👍 github.com/tc39/proposa...

ITS HAPPENING Firefox 127 shipped today making it the first browser to support Temporal - the new API for working with Dates, times, timezones + durations

TypeScript excitement 😉 The "tsgo" native Go port is now available on npm as an early preview 🎉 🔷 Checker: Most projects will see error parity with v5.8 🔷 Now supports JS and JSX 🔷 LSP: Auto-completions work 🔷 Perf: 10x win persists 🔷 API: Sync access via a Node addon

~6.5x speedup on `bluesky-social/social-app` 😎

Today we're announcing previews of the native port of TypeScript! These nightly previews will be available on npm and the VS Code marketplace! npm install -D @​typescript/native-preview npx tsgo --version Read up more on our blog!

I just realized that yesterday I told someone that if tsgo took a minute on a codebase and is around 10x faster, you could extrapolate that tsc must have taken around an hour or so. And somehow that brain fart is going to haunt me for at least the next month.

Happy to say that I'll be speaking at @gophercon.com 2025 about TypeScript's port to Go! There's a lot of interesting stuff to talk about, from the effort's inception, the actual process of porting, and all of the Go stuff we learned along the way (gotchas, perf). www.gophercon.com/agenda/sessi...

Lil’ TypeScript tip: Instead of using `@ts-ignore` for stuff you don’t feel like fixing rn, use `@ts-expect-error`. When you do fix the issue, `@ts-expect-error` will *itself* become an error (which you can fix by deleting the comment). That way, you avoid stale ignores that aren’t needed anymore.

Windows Advanced settings is here! We restructured the For Developers page and added new features such as File Explorer with version control 🚀 Easily view your Git information directly in columns within File Explorer! 🔥

the @vscode.dev extension for @github.com Copilot is going open source. I like seeing this push toward keeping this work out in public

Have you seen the news? Check out our exclusive interview with Erich Gamma, creator of VS Code, and Kai Maetzel, Copilot Lead to get all of the details! We dove deep into the announcement but also how they feel about VSCode forks and the history of VSCode. youtu.be/GMmaYUcdMyU

Today, we're announcing plans to make VS Code an open source AI editor. We believe AI development should stay true to VS Code's core principles: open, collaborative, and community-driven. Let's build the future of software development together. aka.ms/open-source-...

Who do I know who is looking for a senior+ developer job?

💯 v1.100 of VS Code is here! And we’ve got some great updates for you, like: - Smarter chat responses with new tools - Improved multi-window support - Image and Streamable HTTP support for MCP servers …and so much more. aka.ms/VSCodeRelease Here are some of the highlights… 🧵

VS Code extensions can contribute tools to Copilot agent mode - see this in action with the Prompt Boost extension 👇

I'm optimistic that the next 12 months is going to a very special time for JS performance ⚡ (This applies to developer workflows & end-users.) Several large-scale independent multi-year language, runtime, tooling, & library investments are approaching the payback stage all around the same time.

Finally reviving my blog! Wrote a few thousand words about one of the most notorious bugs we encountered when porting tsc to Go: accidental variable shadowing. It's a pleasure to write go/analysis passes, and I was really happy with the results of my shadow analyzer. Please enjoy the CFG diagrams!

Choosing Languages steveklabnik.com/writing/choo...

I guess I missed some excitement earlier this week but here is my better late than never take: writing programs in Go is fine, actually; whereas it's fairly uncool to hassle someone about their decision to do so.

1/ 2025 has already been a good year for #TypeScript: • Type stripping increases the conceptual clarity of what TS is, has made emitting .js faster, works well without source maps (via blank spaces) and doesn’t require a tsconfig.json. 2ality.com/2025/01/node...

The end of an era. Get back to work!

TypeScript *earth-shattering* excitement 😉 The TypeScript team have rewritten the compiler in Go in order to optimize performance 🎉 🔹 10x faster type-checking 🔥 🔹 Uses significantly less memory This will hugely improve the TypeScript authoring & compilation experience.