The next Vitest version will support `vi.mock(import(path))` syntax for better IDE support when mocking modules.

Babelで書いた処理と全く同じ処理をOxcパーサ使ってRustで書いてWasm化してみて、Nativeに比べてデシリアライズのオーバーヘッドがあるから小さいファイルならBabelの方が速いと予想して10行程度のtsxのトランスパイルを比較したらそれでもRust版の方が3倍速かった

So many reward programs 👀

Vitest 1.6.0 is out!

- performance improvements to the 'forks' pool
- `--standalone` flag to start Vitest in watch mode without running tests
- `--compare` flag to compare benchmark results
- new options to inject scripts in browser mode
- bug fixes

github.com/vitest-dev/vit…

TypeScript excitement 😉

Congrats to Hana Joo Google on landing the Code Fixer for Isolated Declarations in upstream TypeScript, heading for TS 5.5 🎉

Thanks to Jake Bailey Sheetal Kamat/Nandi Andrew Branch Titian Cernicova-Dragomir 💙💛 Jan Kühle for reviews & support 👍

github.com/microsoft/Type…

You (and companies) can offer bounties on oxlint if you want certain features or linter rules implemented.

Oxlint is currently community driven, all linter rules are submitted by contributors right now.

This is a demonstration:

Rolldown now compiles to WASI!
Online playground incoming...

github.com/rolldown/rolld…

We are going to shift directions.

In response to the rise of AI, we are going to work on LLM transformers instead,

2 good first issues to improve the script tag extracting parser for svelte and astro:

* github.com/oxc-project/ox…
* github.com/oxc-project/ox…

Oxc is (almost) single handedly rustifying the js tooling ecosystem lol. Js/ts parser via oxc_parser, node module resolution via oxc_resolve, es-module-lexer equivalent via oxc_module_lexer. A lot of building blocks that I typically use for a lot of tooling that I work on

Rolldown might be the most important web project of the next 5-10 years. I thought it might be helpful to explain why:

The landscape:

Rollup is the best and most comprehensive bundler to date. It was ahead of its time, pioneering key concepts like tree shaking (🙏 Rich Harris

Hello world!

Rolldown is now open source on GitHub: github.com/rolldown-rs/ro…

What?! Sadegh Barati already added it into `shadcn-vue`!!! 💚🚀

A month of writing and 3.5k words later, here's a very extensive guide about Hot Module Replacement! bjornlu.com/blog/hot-modul…

Vite 5.1 includes experimental support for the new 'Vite Runtime' primitive. It comes with support for HMR on the server and the ability to run Vite SSR anywhere!

Feedback is welcome! github.com/vitejs/vite/di…

ECMAScript deprecation ⚠️

Import Assertions are deprecated. Chrome 123 will warn you to prefer `with` instead of `assert`.

import v from 'm' assert {} // Warns!

Chrome 126 will remove `assert`. Safari & Firefox will only ship `with`.

github.com/tc39/proposal-…

Oxc's two year anniversary 🎂

Amazing work!

github.com/oxc-project/ox…

The Mac turns 40 today 🎂

To celebrate, we're giving away Raycast Pro with GPT-4 for one year to 40 people. Simply retweet this tweet and follow Raycast to enter. Winners will be announced by the end of the week.

Today I was looking at Vitest coverage, mainly this PR github.com/vitest-dev/vit…. V8 coverage data collection itself is very simply done by using `node:inspector`. For example, posting 'Profiler.startPreciseCoverage' message will generate coverage data in json as described in...