Hugo Campos

Announcing TypeScript 6.0 RC - TypeScript Today we are excited to announce the Release Candidate (RC) of TypeScript 6.0! To get started using the RC, you can get it through npm with the following command: npm install -D typescript@rc TypeScri...

The Release Candidate for TypeScript 6.0 is now available!

Read up on what's coming up with 6.0 & 7.0, and try it out on your codebase today!

devblogs.microsoft.com/typescript/a...

Oxfmt Beta A collection of high-performance JavaScript tools written in Rust

Announcing Oxfmt Beta

* 100% Prettier Compatibility
* Additional File Formats
* Tailwind CSS Integration
* Import Sorting
* package.json Sorting
* Embedded Language Formatting
* Node.js API
* `--migrate prettier`
* config overrides
* Full IDE support

oxc.rs/blog/2026-02...

Infographic showing Rolldown's entriesAware code splitting feature in 3 steps. Step 1 shows three entry points (Dashboard using chart.js, Admin using marked, Landing using gsap - all sharing es-toolkit). Step 2 shows the problem: without entriesAware, all entries load a single 305KB vendor.js containing all libraries. Step 3 shows the solution: with entriesAware enabled, chunks are split by usage - a shared 8KB chunk for es-toolkit plus entry-specific chunks (195KB for dashboard, 40KB for admin, 63KB for landing), reducing average page load to 107KB and eliminating unused library downloads. Code snippet shows the configuration: entriesAware: true and entriesAwareMergeThreshold: 20000.

Chunks are now entry-aware in Rolldown 1.0.0-rc.5 ⚡

What does that mean? When grouping chunks via `codeSplitting`, they can now be automatically split per entry point (usually per page), so users download less unused JavaScript.

Just set `entriesAware: true`.

Announcing TypeScript 6.0 Beta - TypeScript Today we are announcing the beta release of TypeScript 6.0! To get started using the beta, you can get it through npm with the following command: npm install -D typescript@beta TypeScript 6.0 is a uni...

TypeScript 6.0 beta is now published!

This release brings

- inference improvements for functions
- updates to package.json 'imports'
- the Temporal APIs
- alignments for the upcoming TypeScript 7.0
- & more!

Try it today!

devblogs.microsoft.com/typescript/a...

Rolldown 1.0 RC is here 🎉

🔒 Stable API: No breaking changes planned before 1.0
⚡ 10-30x faster than Rollup while staying compatible
🧩 Multiple chunking algorithm improvements
📦 3,400+ commits since beta: 749 features, 682 fixes, 109 perf optimizations

Rolldown | Rust bundler for JavaScript Fast Rust-based bundler for JavaScript with Rollup-compatible API

@rolldown.rs just released the first RC version 🎉 We’ve been using the betas for a while for our custom dev server and it has been great. It’s awesome to see it stabilize!

github.com/rolldown/rol...

Release v4.1.0-beta.1 · vitest-dev/vitest 🚀 Features Return a disposable from doMock()  -  by @kirkwaiblinger in #9332 (e3e65) Added chai style assertions for spying  -  by @ronnakamoto and @sheremet-va in #8842 (841df) Update to sinon...

The first beta for @vitest.dev 4.1 is out! 🧪

◆ Chai-style spy assertions (`toHaveBeenCalled`, etc.)
◆ `userEvent.wheel()` for browser mode
◆ Enhanced retry options
◆ Disposable returned from `doMock()`
◆ Coverage ignore start/stop hints
◆ and more 👀

Try now by installing vitest@beta

// Currently let prefs = new getUserPrefs(); if (!prefs.has("useDarkmode")) { prefs.set("useDarkmode", true); // default to true } // Using getOrInsert let prefs = new getUserPrefs(); prefs.getOrInsert("useDarkmode", true); // default to true

ECMAScript excitement 😉

Congrats to Dan Minor @mozilla.org on advancing the Upsert proposal to Stage 4 at TC39 today 🎉

let map = new Map();
map.getOrInsert(key, defaultVal);

It lets you set a default value on a map key without overwriting an existing value 👍

Node.js v25.4.0 is out! 💚

• require(esm) now stable and a new CLI flag: --require-module
• http setGlobalProxyFromEnv() added
• Multiple APIs promoted to stable (heapsnapshot, build snapshot, v8.queryObjects)
• Root CAs updated to NSS 3.117

More in: nodejs.org/en/blog/rele...

Firefox 147 release notes for developers (Beta) - Mozilla | MDN This article provides information about the changes in Firefox 147 that affect developers. Firefox 147 is the current Beta version of Firefox and ships on January 13, 2026.

Firefox 147 just landed & it's pretty huge in terms of web features:

🎉 CSS anchor positioning
🎉 The navigation API
🎉 View transition types
🎉 Brotli support in Compression/DecompressionStream
🎉 CSS module imports

And more!

https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/147

[ci] release by astrobot-houston · Pull Request #15031 · withastro/astro This PR was opened by the Changesets release GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not read...

Thanks to @43081j.com for contributing a **massive** improvement in rendering performance. Benchmarking reports as high as 11x improvement 🤩. Upgrade to astro@5.16.7 when you can.

James gave an excellent explanation of the improvement in the PR: github.com/withastro/as...

Open source ftw!

What’s New in ViteLand: December 2025 Recap Our December 2025 recap features big Oxc releases: Oxfmt alpha builds and Oxlint's type-aware linting alpha, plus updates across Vite, Vitest, Rolldown, and community highlights.

Happy new year 🎉
Our December 2025 recap is out!

⚡ Oxlint type-aware linting alpha
🎨 Oxfmt with @vuejs.org, Markdown & JSON support (+ more languages)
📦 @rolldown.rs chunking improvements
🔬 @vitest.dev OpenTelemetry & import breakdowns
🗺️ 2026 Oxc roadmap
👀 and more

voidzero.dev/posts/whats-...

Signals vs Query-Based Compilers With the rise of LSPs, query-based compilers have emerged as a new architecture. That architecture is much more similar and also different to Signals than I initial assumed them to be.

Putting Signals in your compiler? Turns out this is already happening.

marvinh.dev/blog/signals...

React Wrappers Generate react wrappers for your custom elements / web components

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...

Indeed! And often I prefer to mock less and test more like an end user would, in exchange for a slight performance penalty compared with more “unit” style tests. I find it makes tests provide a lot more bang for the buck.

Vitest Next generation testing framework powered by Vite

Absolutely! We’ve been using Karma for years and have been moving to Vitest and it has worked great for us. Some folks have struggled a bit with some of the mocking limitations (vitest.dev/guide/browse...) but have managed to find other ways around it. Overall, really nice!

Changelog for a few Lit packages. See https://github.com/lit/lit/pull/5183 for details.

Changelog for a few Lit packages. See https://github.com/lit/lit/pull/5183 for details.

📣 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 Oxlint's type-aware linting has reached alpha status. Type-aware rules can be manually configured, disabled with in-line comments, and fixed automatically. This milestone also includes more rule…

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

Vite 8 Beta: The Rolldown-powered Vite The first beta of Vite 8, powered by Rolldown, is now available. Vite 8 ships significantly faster production builds and unlocks future improvement possibilities. Read more about the migration, new fe...

⚡️ 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!

Progress on TypeScript 7 - December 2025 - TypeScript Earlier this year, the TypeScript team announced that we’ve been porting the compiler and language service to native code to take advantage of better raw performance, memory usage, and parallelism. Th...

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...

Oxfmt: Oxc Formatter Alpha A collection of high-performance JavaScript tools written in Rust

Announcing Oxfmt: Oxc Formatter Alpha

oxc.rs/blog/2025-1...

Storybook-MCP-early-access-program

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)

Very nice! We’ve been waiting for it for a long time. We’ve been hacking our own UI into the main iframe 😅🙈 One thing that would be really nice on top of this is a button to “accept” that particular screenshot as a new baseline, without having to do the regular -u to update snapshots.

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 👀

Release v11.0.0 · immerjs/immer 11.0.0 (2025-11-23) Performance Improvements Rewrite finalization system to use a callback approach instead of tree traversal (#1183) (d6c1202) BREAKING CHANGES enable loose iteration by defaul...

_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