Sentry gave $750k to over 650 OSS projects in 2025. Unfortunately, @tailwindcss.com wasn't one of them. We can't do this alone; more companies need to join @opensourcepledge.com, for the good of the internet.

Sad to see that AI is slowly killing open source software 😵

🧙‍♂️ I've been playing with GitHub Copilot lately. 1. When you start using it, you start loving it 2. But it's far from doing something right immediately So why is it cool? I can write and fix code from my mobile, from a train, a bus... I can ask for basic tasks to be handled only by AI.

🎁 fast-check 4.5.0 just got released 🖇️ It adds support for relational structures via a new arbitrary called entityGraph. Give it an erzat of your db schema, it will came up with entities marching it. 🔜 Still more to come for entityGraph, mostly around shrink. 🔜 Next minor might address fuzzing.

🚨Standard JSON Schema v1 just dropped🚨 🟢libraries can now accept ArkType wherever they need JSON Schema 🟢100% type-safe with inference built-in 🟢day one support from AI SDK 🟢TanStack AI and MCP SDK support imminent

StandardSchema now supports a new interface to generate JSON Schemas ! 🙌 I started working on a StandardCodec RFC, for bidirectional data type transformation (which encompasses (de)serialisation), like what @zod.dev codecs & Effect schemas can do. Could be a sign to push it a little further 👀

Quick release note for 4.4.0 🎁 fast-check.dev/blog/2025/12...

⚠️ The security release has been postponed to the 18th of December. The team is working on a challenging patch.

⚔️introducing TypeSlayer⚔️ A #typescript type performance benchmarking and analysis tool. A summation of everything learned from the benchmarking required to make the Doom project happen. It's got MCP support, Perfetto, Speedscope, Treemap, duplicate package detection, and more.

😭 My #renovate bot suddenly stopped working on @fast-check.dev. It OOMs on a regular basis... I don't know how I can prevent that 😵

After a few months of targeted attacks on our ecosystem, followed by a confusing and rapidly changing response from @github.com, we wanted to put together some guidance for maintainers on how to help us all secure our supply chain together. Here is that guidance 👇

npm has revoked classic tokens for publishing, pushing maintainers toward OIDC trusted publishing or granular tokens. But @openjsf.org warns trusted publishing still has risky gaps for critical projects. What maintainers should do next: socket.dev/blog/npm-rev... #NodeJS #JavaScript

🚀 Yesterday, we released our new minor, version 4.4.0. It includes a few new arbitraries: for set and map. The next minor will add support for recursive structures having reused references. We had to drop it at the last minute due to unfixable flows in the original design.

Fit width text in 1 line of CSS `text-grow: per-line scale;` nerdy.dev/css-text-grow (prototype in Canary 165+)

Just realized that I'm older than JavaScript 😅👴

The Full Conference Speaker Lineup ➕ Agenda are Live! 🔥 The ultimate #ReactParis 2026 squad is here; ready to blow your mind with cutting-edge #talks, deep dives, and game-changing insights. ℹ️ All you need to know about this 2026 edition #programme 🧾 in the first comment 👇🏽

we're trying to come up with some good lint rules for performant syntax. if you have any ideas, let us know in the issue! ideally things which are provably faster or more efficient with memory across all engines

I'm working on a new built-in arbitrary for @fast-check.dev but so far I'm stuck on typings. I want to be sure I can come up with appropriate typings before moving on with the implementation... My current version is available at gist.github.com/dubzzz/20452..., but ideally I'd like to...

We've got some updates on TypeScript 7! The new native port - can type-check any project - supports --build and --incremental - has rich editor features implemented - is still 10x faster and is ready for you to try today! devblogs.microsoft.com/typescript/p...

Vitest 4.0.15 comes with a cool experimental feature: Imports Breakdown. Every module shows how long it took to load in UI and in the VSCode extension! Pass down `--experimental.printImportBreakdown` to also see it in your terminal. vitest.dev/guide/ui.htm...

🎅 Last year our second day was about finding duplicated gifts 🎁 👉 If you haven't try it you can still give it a try this year

In the next version of ArkType, any Standard Schema is a valid definition. Zod migration is about to get a whole lot easier🚀

Announcing Oxfmt Alpha! 🚀 We’re excited to announce the alpha release of Oxfmt, our Rust-powered formatter. We designed Oxfmt to be easily adoptable, especially for existing Prettier users More below and in our announcement post voidzero.dev/posts/announ...

No new Advent for this year 😑 But if you're keen on learning Property Based Testing the one from last year is still relevant 🎅 #Advent #Testing #JavaScript

I'm signing the @opensourcepledge.com, it's time to give back to the maintainers of the projects @nuqs.dev depends on. I just gave 2700€ ($3,212) to 18 maintainers & projects I use, love, and want to support. Happy Thanksgiving! 💖 nuqs.dev/blog/open-so...

We just made Next.js 93% faster in Kubernetes. Not a typo. Median latency: 182ms → 11.6ms Success rate: 91.9% → 99.8% How? We stopped fighting the Linux kernel and started working with it. Thread on why your Node.js pods are slower than they should be 🧵

🤯 The number of affected packages in the Shai-Hulud npm attack has now reached 770. We’re continuing to investigate and will keep the blog post updated: socket.dev/blog/shai-hu...

Path matching in a router? How hard can it be 🤷‍♂️. Hard to do correctly. Very hard to do fast on top of that. This is a great blog post about the recent core refactoring done in @tanstack.com router 🔥

And don't forget to vote for the newsletter at the end BTW 😇 Last year, we were third, but this time I have hope to be above devto and CSS Tricks! 😄

Time to answer the survey. If you use fast-check don't forget to put us as a testing tool 😅

👀 Future of JS This underrated upcoming JS feature is super useful 🔥 Soon, you should be able to import JS code as a string! This is super useful, in particular for docs sites! Similar to Webpack raw loader, asset query ?raw etc, but available everywhere natively!

❌ If you unit-test a React 19 app, there’s a good chance a chunk of your CI time is being wasted on… 😴 setTimeout. Wait, what? Yes! React 19 introduced a minimum delay for showing a Suspense fallback, and hardcoded (!) it to 300ms. Just 3 tests can waste almost 1 second on absolutely nothing!

🤔 What if there were a conference without talks? Just hanging out with OSS maintainers & builders, seeing what they’re working on, and learning cool stuff by actually talking to people. 🤯 What if hallway track turned into the whole event! 💡 @tannerlinsley.com is exploring it. Interested? ⬇️

With npm supply chain attacks on the rise, secure publishing practices are becoming a pressing concern for anyone maintaining npm packages. ⚠️ We've released updated guidance to help maintainers reduce exposure, strengthen release processes, and protect the ecosystem: openjsf.org/blog/publish...

🥳 The newly added trust policy seems awesome. But for now, it seems rxjs 7.2.0 makes it unhappy. www.npmjs.com/package/rxjs...

🤶 No Advent of PBT for this year, but if you have not tried the one of last year probably a good one to do 💕

if you've been using `provenance-action`, I'm delighted to say you can now replace it with @pnpm.io v10.21's new `trustPolicy` feature! 🎉

Activating the Copilot Business from my company on my account, dropped my access to my own Copilot Pro 😵 Surprised that @github.com did not think of these cases, I feel I miss something

@nico.dev learning us how to build K.I.T.T. with Javascript.

ECMAScript excitement 😉 Congrats to proposal champion Dan Minor @mozilla.org on shipping the TC39 Stage 3 Upsert proposal in Firefox 144 🎉 let map = new Map(); map.getOrInsert(key, defaultVal); It lets you set a default value on a map key without overwriting an existing value 👍

ECMAScript excitement 😉 Congrats to Evan Wallace on shipping the TC39 Stage 2.7 Import Bytes proposal in ESBuild 0.25.11 🎉 It lets you import raw bytes as a readonly Uint8Array 👍 import buf from "./a.png" with { type: "bytes" } Also available in Deno, Bun, & webpack.

As for the launch of Vite+, I'm glad we now have the demo and the website. Probably it's best to wait for the blog post (promised for Monday) to really understand it and continue the conversation. viteplus.dev

Huge positive news for the React community. React and React Native are moving out of Meta and into Linux Foundation. engineering.fb.com/2025/10/07/o...

i wrote about atproto and why it matters

Awesome 😍 I'll definitely give it a try for the CI of @fast-check.dev

This is great news! GitHub will require use of passkeys for 2FA when publishing to NPM. What a huge step up in security compared to other phishable 2FA methods that were historically supported 🎉 github.blog/security/sup...

Rolldown v1.0.0-beta.39 has been released! ⚡ macOS Performance Boost: 10%-30% faster bundling, up to 45% in extreme cases. 🎯 Cross-Chunk Optimization: Support for __NO_SIDE_EFFECTS__ annotation, as well as better tree-shaking across module boundaries and more efficient DCE

eslint-plugin-depend released! this ESLint plugin helps you find dependencies the @e18e.dev community has recommended replacing thanks to @bluwy.me for adding eslint/json support too 🙏

ECMAScript excitement 😉 Next week's TC39 meeting has a packed agenda: 🔼 Amount 🔼 Array.prototype.pushAll 🔶 AsyncContext 🔶 Await Dictionary 🔼 Import Bytes 🔶 Intl Era Month Code 🔼 Iterator Chunking 🔶 new Global() 🔼 Non-extensible applies to private 🔼 Promise Adoption 🔼 Promise Predicate 🔶 Temporal

our two-step process for fast typescript types: 1️⃣ build a type-level benchmarking library 2️⃣ spend the prime of your life on cache optimizations