Happy New Year! The #WebComponents @react.dev wrappers have joined the WC Toolkit and have some nice upgrades, including: - Strongly typed events - CSS variable types for components - Component and tag name formatting wc-toolkit.com/integrations...

Introducing Flint: a fast, friendly linter. Flint is an experimental linter made to validate several hypotheses: hybrid linting, streamlined rich configuration, thorough docs & plugins, and tooling coordination. Expect to hear more about Flint over the next month. ❤️‍🔥 www.flint.fyi/blog/introdu...

📣 We just published our End-of-Year / Happy Holidays Lit releases! - 👩‍⚕️ Many bug fixes! - 📄 A new lit-labs/forms packages for form-associated elements! - 🎾 A new Spring controller in lit-labs/motion! - 🏎️ Massive SSR performance improvements! - 🧩 A lit-html template parser in lit-labs/analyzer

We’re sharing details about a potential vulnerability that may affect a small subset of built and published Storybooks. 🧵 (1/4)

ECMAScript excitement 😉 The Temporal API ships in Chrome 144 Beta today 🎉 developer.chrome.com/blog/chrome-... Right on time. Arriving in the Chrome Stable release in approximately one month!

Announcing Oxlint Type-Aware Linting Alpha 🎁 Just a few months after our technical preview, type-aware linting reaches the alpha milestone! ✨ Type-aware rules can now be configured 🙈 Inline comments to disable rules work for type-aware rules too ✔ Auto fixes for type-aware rules are now available

⚡️ The first Vite 8.0 beta is here! - Powered by Rolldown, bringing significantly faster production builds and more consistency - New features such as tsconfig paths or emitDecoratorMetadata support - Bumping browser targets aligned with Baseline Widely Available Read more in our announcement post!

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...

Announcing Oxfmt: Oxc Formatter Alpha oxc.rs/blog/2025-1...

Agents can’t “just read the repo.” Thousands of files + type soup = instant confusion. Storybook MCP gives agents only the good stuff—curated patterns from your stories, docs & tests—and a loop to self-fix with your component tests. Link to request early access in comments 👇

Instead of providing your tsconfig manually in @rolldown.rs, you can now enable @vite.dev like automatic resolution. ◇ Finds the nearest tsconfig.json ◇ Respected by both, resolver and transformer ◇ tsconfig references will be searched as well (given certain criteria are fulfilled)

Merged! Vitest 4.0.14 includes a new tabbed view and slider for visual regression reports 🎉 This feature required a lot of work under the hood, including the creation of the new test artifacts API. Really curious to see how it'll be used by us and the ecosystem 👀

_Very_ excited to announce that @mweststrate.bsky.social just published Immer 11.0 with the major architectural rewrite I did to improve perf! 10.2 already had several smaller tweaks, and there's one more PR up to add optional array overrides: github.com/immerjs/imme... New RTK release soon!

The adventure begins right now 🎮✨ Tune in right now, you don't want to miss a second: goo.gle/angular-v21

Oxlint enabling type checking straight out of tsgo! This should speed up the slow `tsc --noEmit` step in large repos. PR: github.com/oxc-project/...

Wrote about how our testing strategy evolved to include visual regression testing and how we can generate hundreds of tests in a handful of lines of code Spoiler: turns out high school math can be useful after all 😶‍🌫️ macarie.me/writing/when...

Storybook 10 is here! ✂️ ESM-only (the only breaking change!) 🧩 Module automocking for easier testing 🏭 Typesafe CSF factories Preview for React 💫 UI editing and sharing optimizations 🏷️ Tag filtering exclusion for sidebar management 🔀 Svelte async component support

🔥 Hot off the press 🔥 You can you can finally style anchored elements based on their fallback position in CSS! Meet the CSS anchored container query 🤝 container-type: anchored @‎container anchored(fallback: <fallback-name>) (landing in Chrome 143) developer.chrome.com/blog/anchore...

Vitest 4 is out! - Browser Mode is Stable - Visual Regression Testing - Improved Debugging - Pool Stabilization - New APIs - Bug Fixes Stay updated with our blog post: vitest.dev/blog/vitest-4

⚓ Oxlint now supports plugins written in JavaScript ⚓ Developers can customize and extend Oxlint using JavaScript, but at a speed approaching Rust, due to 'raw transfer' between Rust and JS, and other breakthroughs Many ESLint plugins can run without any modification. Read the full post👇

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 👍

inherit() is going to be absolutely huge for working with CSS custom properties. Two big things it'll enable: Nested indentation: --indent: calc(inherit(--indent, 0) + 1); Overridable design token defaults: --primary-color: inherit(--primary-color, blue);

React 19.2 is now available! This release includes Activity, useEffectEvent, React Performance Tracks, partial pre-rendering, and more: react.dev/blog/2025/10...

I'm very excited to announce the release of the #WebComponents CLI validator! Now you can validate your web components in your build pipelines. #html #javascript

Next version of Browser Mode now also support playwright's trace viewer natively. Just pass down `--browser.trace=on`: main.vitest.dev/guide/browse...

New post on big general type-checker improvements. How `specification.md` can be used to test both features and performance. And perhaps what is up for version 0.1.0...

We’re live!! My brand-new course, “Whimsical Animations”, is now available. 🥳🎉 whimsy.joshwcomeau.com I’m so excited to share all of my animation tools and techniques with y’all. 😄

TypeScript excitement 😉 TS 6.0 will enable "noUncheckedSideEffectImports" by default 🎉 This increases type safety by erroring if you try to import a non-existent file. Thanks for @arnaud-barre.bsky.social for pitching & @searyanc.dev for manually coding the PR 👍 github.com/microsoft/Ty...

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

From the latest articles by @una.im & @ishadeed.com on CSS Anchor Positioning, I realized it’s not just for menu and tooltips. una.im/follow-the-a... ishadeed.com/article/anch... It’s more like position: relative across DOM. Like you can make a floating :focus.

type-fest 5 is out! 🚀 (essential TS types) Strictness helpers: - ExtendsStrict - ExcludeStrict - ExtractStrict Checks: - IsUnion - IsOptional - IsNullable Key-level checks: - IsOptionalKeyOf - IsReadonlyKeyOf - IsRequiredKeyOf - IsWritableKeyOf And lots of bug fixes! github.com/sindresorhus...

A while back, I was building a particle animation, and I ran into some weird issues. The particles were turning grey, mid-animation. And sometimes, they wouldn’t change color at all! Turns out, there’s a pretty big limitation with color transitions. I share some solutions in my brand-new post!

Rolldown drops CJS support! From the latest version of @rolldown.rs (1.0.0-beta.36) on, Rolldown will only be released in the ESM format. The required Node version has also been bumped to align with @vite.dev (20.19+ and 22.12+). Node 18 has been dropped due to being EOL since April.

Looks like CesiumJS just released a new Martian data set on Cesium Ion! Controls and rendering work out-of-the-box with 3d-tiles-renderer, as well. Mars rover integration coming... someday? 🤖 Demo link below 👇 #threejs #webgl #gis #nasajpl #3dtiles

Composition with the Shadow DOM is more powerful than you think. You can do a lot with the default named slot assignment, but manual slot assignment is a pathway to many abilities some consider to be… unnatural.</emperor-palpatine>

About 10 months ago I benchmarked the most popular bundlers to compare build speed and bundle size (tree-shaking + minification). I just re-ran the tests with the latest versions to see what’s changed 👇

From the archives: “Misconceptions about CSS Specificity” - Misconception 1: Specificity is a decimal score - Misconception 2: Using the style attribute (“inline styles”) adds Specificity - Misconception 3: Using !important adds Specificity bram.us/2024/05/05/m...

Rspack v1.5.0 is out! 🎉 ⚡️ Barrel file optimization ⚡️ Faster file system watcher ⚡️ Smaller installation size 💪 Extending Rspack with Rust 💪 Type re-export analysis And many exciting new features... Read more in our blog: rspack.rs/blog/announc...

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...

🎉 Preact 11 beta is here! After years of thoughtful development, we're delivering major improvements with minimal breaking changes. Better hydration, forward refs by default, and performance upgrades - all while maintaining the stability you love about Preact X.

View Transitions are enabled by default in Firefox Nightly, so they're on their way to stable. Give it a test with your current transitions, and give me a shout if anything doesn't look right.

Announcing Oxlint Type-Aware Preview oxc.rs/blog/2025-08...

Why is no one talking about this PR that brings multi-threaded linting to eslint itself 🤯 Tried it out on the @sentry.io codebase and it yields an instant 35% time reduction with `--concurrency=2` in CI 🔥 This is fantastic 🚀

The semver library used in npm, yarn and pnpm could be made 33x faster. Ran into that while wondering why running `npm install` takes so long on the Preact repo. marvinh.dev/blog/speedin...

TypeScript 5.9 RC is available to try! Let us know how it works before next week's stable release! devblogs.microsoft.com/typescript/a...

oxlint + tsgolint = no slow down! no-floating-promises completes 4.4k files in 3.2 seconds, in the vscode repo. typescript-go is the future, all credits to the ts-go team! We just glued everything together 😀 github.com/microsoft/ty...

TIL — the CSS working group is working on `appearance: base;` which will give us: - Identical styles across all browsers - 100% WCAG 2.2 compliant controls - Easy ways to customize all these form elements 💯 This talk is time very well spent. 👇 www.youtube.com/watch?v=WgSi...

almost nobody's found this yet so I'll just drop it here without context github.com/typescript-e...

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