@vitest.dev Core Team • Open Source @chromatic.com • github.com/AriPerkkiohttps://bsky.app/profile/ariperkkio.devhttps://bsky.app/profile/ariperkkio.dev/post/3mlq2hteh5c2iTesting terminal output is hard. Especially in cases that involve clearing screen partially while maintaining stable log output elsewhere on screen. With ansivision it's possible to simulate what output all the ansi codes would render visually in real terminal. No need to use heavy node-pty anymore. [contains quote post or other embedded content]13 May 2026 10:04 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3mlq2hteh5c2ihttps://bsky.app/profile/ariperkkio.dev/post/3mjjuoqn5uc2hThere's some impressive work going on with 3rd party oxc powered coverage instrumentation that can replace Babel based istanbul-lib-instrument 👀 > 8-11x faster than babel-plugin-istanbul, 13-15x faster than swc-plugin-coverage-instrument (Rust/WASM), 25-30x faster than istanbul-lib-instrument. https://github.com/fallow-rs/oxc-coverage-instrument15 Apr 2026 12:14 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3mjjuoqn5uc2hhttps://bsky.app/profile/ariperkkio.dev/post/3mj4r2ro4h226@vitest.dev just surpassed Jest in npm weekly downloads 📈 https://npmx.dev/compare?packages=vitest,jest10 Apr 2026 07:05 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3mj4r2ro4h226https://bsky.app/profile/ariperkkio.dev/post/3mhczgd4nik24This day 4 years ago I sent my first PR to @vitest.dev. Back then it was on v0.7.4 with 80K weekly downloads. After one year and +70 more PRs, @antfu.me and @erus.dev invited me to join the team. Today we are at v4.1.0 with 35M weekly downloads. Maybe in 2030 we'll have Vitest 8 with 140M downloads. https://github.com/vitest-dev/vitest/pull/97818 Mar 2026 08:00 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3mhczgd4nik24https://bsky.app/profile/ariperkkio.dev/post/3mey3msuwks2cIn the next version of Vitest you can track leaking asynchronous resources via `--detect-async-leaks` option! Available in v4.1.0-beta.4 release. 🔍 (notice missing await in the example)16 Feb 2026 12:50 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3mey3msuwks2chttps://bsky.app/profile/ariperkkio.dev/post/3meg65x3dxk2hExcited to announce that I've officially joined @chromatic.com! My main focus will be working around features related to @vitest.dev 🤝09 Feb 2026 09:47 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3meg65x3dxk2hhttps://bsky.app/profile/ariperkkio.dev/post/3mc7urwsutc2aI'd like to avoid forking Istanbuljs monorepo just for Vitest. Any istanbuljs Github organization members here who could make me a maintainer there? (@kentcdodds.com, @jasonkurian.dev 👋) https://github.com/vitest-dev/vitest/issues/943312 Jan 2026 10:53 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3mc7urwsutc2ahttps://bsky.app/profile/ariperkkio.dev/post/3m7hxng4cz225When using vite@8-beta with Vitest users no longer need to add magical '@preserve' keywords in their coverage ignore hints. Originally this work-around was needed due to esbuild's (intentional) lack of support for comment preserving. Oxc has built-in support for JS coverage tools' ignore hints.08 Dec 2025 11:50 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3m7hxng4cz225https://bsky.app/profile/ariperkkio.dev/post/3m4uhlsfll22iExcited to see Typesafe CSF factories solve RFC I wrote two years ago. No more explicit TS typings! https://github.com/storybookjs/storybook/discussions/25319 [contains quote post or other embedded content]05 Nov 2025 06:52 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3m4uhlsfll22ihttps://bsky.app/profile/ariperkkio.dev/post/3m3pv73zfuc22After maintaining Tinypool for over 2 years I'm happy to see next version of Vitest dropping it. I've written some reasoning about this in the linked PR. Even though this change is significant for Vitest, I'm more confident about it than making new changes in Tinypool. https://github.com/vitest-dev/vitest/pull/870521 Oct 2025 17:47 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3m3pv73zfuc22https://bsky.app/profile/ariperkkio.dev/post/3lxh2n2pp5c2cSetting custom `process.title` in Node takes around 10-20ms. Vitest used to do this for every isolated test file so that debugging test runner processes was a bit nicer experience. But it's not worth the performance hit. [contains quote post or other embedded content]28 Aug 2025 07:49 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3lxh2n2pp5c2chttps://bsky.app/profile/ariperkkio.dev/post/3lqwdgd6tgk2cWe've added new coverage provider comparison page on Vitest documentation. This guide describes the lower level differences between Istanbul and V8. It should help users choosing which provider to use. https://vitest.dev/guide/coverage.html#v8-provider06 Jun 2025 07:40 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3lqwdgd6tgk2chttps://bsky.app/profile/ariperkkio.dev/post/3lqncvbjrtc2pAST based V8 code coverage is finally here! I thought of this feature first time over 2 years ago, but knew it would require so much work that I couldn't finish it by working on Vitest just on weekends. Ever since @stackblitz.com hired me to work on Vitest I knew I could finish features like this. [contains quote post or other embedded content]02 Jun 2025 17:37 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3lqncvbjrtc2phttps://bsky.app/profile/ariperkkio.dev/post/3lpo6ranjxc2yOnboarding on new @storybook.js.org projects is just perfect. So nice to have testing setup *covered* out-of-the-box. 🤝21 May 2025 08:30 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3lpo6ranjxc2yhttps://bsky.app/profile/ariperkkio.dev/post/3lovnu7jn322fTinypool is now built with tsdown! Migration from tsup was smooth and required minimal changes. Thanks to @sxzz.dev 💯11 May 2025 14:24 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3lovnu7jn322fhttps://bsky.app/profile/ariperkkio.dev/post/3lm53iy3gxs2nAfter couple of days looking at *.cpuprofile's, I think it's getting closer to stable v1 release. The ~3MB checker.ts from Typescript repo is perfect benchmarking reference for tools that process source code. When generating coverage for 'vuejs/core' repo, speed is close to original v8-to-istanbul. [contains quote post or other embedded content]06 Apr 2025 09:01 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3lm53iy3gxs2nhttps://bsky.app/profile/ariperkkio.dev/post/3lloim7ebo225This release includes long-awaited "--silent=passed-only" option, that can be used to hide console.log calls from passing tests. Only the logs from failing tests are reported. [contains quote post or other embedded content]31 Mar 2025 13:46 +0000at://did:plc:byf3ophennvornfu775fvm42/app.bsky.feed.post/3lloim7ebo225