What's new in ViteLand? Our August 2025 recap is out 👣 Big steps for Oxlint: Type-aware linting preview & custom JS plugins roadmap 🖼️ @vitest.dev has visual regression support in beta ⏩ Native plugins enabled by default in rolldown-vite 🤌 Smaller bundles due to @rolldown.rs and Oxc 👀 and more

Vitest 4 runs simple test files faster! You can already check it out by installing Vitest 4 beta. On average, Vitest now takes 25% less time to start the test. Due to parallelisation, the overall time difference can vary. We are focusing our efforts on improving the time even more in the next beta!

⚡ Speaker highlight: Yann Braga, Core Maintainer at @storybook.js.org Storybook is well-known as a one-stop-shop for your components and partnered with @vitest.dev to build the ultimate component testing flow. @yannbf.bsky.social will give us insights and show the full power of Storybook x Vitest

⚡ Speaker highlight: Jessica Sachs, FOSS Nerd at @hero.dev The Browser mode is one of the most exciting features of @vitest.dev! @jess.sh will reveal what makes it so powerful, moving beyond JSDOM. You’ll learn how you can use it for component testing & cases beyond A game-changer for testing! ✅

⚡ Speaker highlight: Vladimir Sheremet, Core Maintainer of @vitest.dev The State of Vitest is a must-see! @erus.dev will give us the news on the most interesting testing framework, covering the latest features, performance boosts, and what's next for the @vite.dev powered testing experience

Testing components that depend on things like localStorage or authentication can be tricky. Storybook makes it easy with our new module mocking API built on top of @vitest.dev's excellent mocking tools. storybook.js.org/blog/next-ge...

Built-in Visual Regression testing comes to Vitest in the next major release! Thank you, @macarie.blue for working on this feature 👏 main.vitest.dev/guide/browse...

Exciting early success with component testing for @react.dev server components (RSC) in @vitest.dev by @kasperpeulen.bsky.social! github.com/kasperpeulen...

Vitest Browser Mode reached almost 1.2 million weekly downloads 😮 Last time I checked it was 200k 🫣

🎉 Excited to see @analogjs.org for @angular.dev pass 50K weekly downloads and still climbing! The @vite.dev , @vitest.dev, and @nitro.build ecosystems are still growing 🚀

Highly recommend checking out @vitest.dev' Browser Mode. Not only did the setup get simpler, but to my surprise, tests got also roughly twice as fast. I only needed to rewrite one bad test suite (out of hundreds) and change the way I import MSW. Absolutely magical stuff 🪄

Wow!! @vitest.dev Browser mode is GOATED!! I moved all my test suite from playwright test to vitest browser, and things became a helluva lot simpler. Requirements: - Interactive draggability test - Cross browser testing Thread 👇

Our latest post walks through how to use the coverage reporting in Storybook 9 to be sure your components are well-tested.

Anyone knows of any good Vitest monorepo examples?

@vitest.dev is awesome. Did you know you can even mock methods that don't exist?? I called them "Ghost Methods" in this post. Reposting because my personal site was broken but I have fixed it!

Wow, love @vitest.dev is preventing me from merging PR with test.only on CI. No configuration. It just keeps me safe.

I just launched a new NPM package - a @vitest.dev utility for automated integration tests with Neon! It's really sweet. Check it out. www.npmjs.com/package/neon...

I’ve made Sveltest a thing 🫣 sveltest.dev This is documentation for getting started using vitest-browser-svelte in your projects I’m currently going through the docs sveltest.dev/docs/getting-started comparing with what me and my team are doing “real-world” and validating Contributions welcome

We'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. vitest.dev/guide/covera...

Storybook 9 is here! ▶️ Interaction tests ♿ Accessibility tests 👁️ Visual tests 🛡️ Coverage reports 🚥 Test widget 🪶 48% Leaner ✍️ Story generation 🏷️ Tag-based organization 🌐 Story globals 🏗️ Major updates for Svelte, Next.js, React Native, and more! Let’s dive in!

🤯 each @vitest.dev release is spot-on on pain points. The low latency between the pain points appearing in the community and the solution landing in Vitest is outstanding

AST 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.

Vitest 3.2 is out! - New Annotations API - Scoped Fixtures - Custom Browser Locators API - Test Signal - Better V8 Coverage Result And many more features! vitest.dev/blog/vitest-...

The next talk from Svelte Summit Spring 2025 by @reinhold.is is also related to testing — Strike the Perfect Balance: Component Testing with Storybook, Svelte, and Vitest. youtu.be/mdyRQDDp28s

🔥 The latest release of @analogjs.org for @angular.dev is out! ✅ Angular v20 support ⚡Stable @vitest.dev support across multiple versions of Angular 🤖 Improved support for generating new Analog apps with @nx.dev github.com/analogjs/ana...

In today's released talk from Svelte Summit Spring 2025 @dominikg.dev talks extensively about testing your Svelte applications with Vitest and Playwright — Testing, 1 2 3 4. www.youtube.com/watch?v=ljmU...

After watching, make sure to check out @scottspence.dev blog post about this. bsky.app/profile/scot... He not only applied the patterns i showed in my talk but also expanded and improved on them, with feedback from @erus.dev too. A great testament of collaboration in our communities.

Angular v20 is now available! ✨ Check out the blog post for more info about the cool features and be sure to tune into the v20 developer event premiering tomorrow, May 29 at 9 AM Pacific goo.gle/angular-v20-...

Testing preact apps in the browser made easy. Jovi did some excellent work on this!

At Preact we love real-browser testing, our whole test suite ran in karma for the last few years. Recently we switched over to @vitest.dev and we absolutely love it, we love it so much that we published vitest-browser-preact. It's a library that contains tools to test Preact in vitest browser mode.

I migrated from @testing-library/svelte to vitest-browser-svelte and blogged about it: scottspence.com/posts/migrat...

📺 Webinar: Behind the scenes of Storybook Test Learn how the maintainers of Vitest + Storybook built a new workflow for running interaction, visual, and a11y tests—in a real browser, with instant feedback, right inside Storybook. 👇 Register below

I think that `expect.poll` is one of my favorite @vitest.dev features ⏰ Less fake timers mess 💾 Useful for Wide tests, waiting for DBs to "settle" 🏁 Wait for UI to be stable 🪄 ... you name it What's your favorite Vitest feature? (🎁 @playwright.dev has the same API 👯) #testing #javascript

Onboarding on new @storybook.js.org projects is just perfect. So nice to have testing setup *covered* out-of-the-box. 🤝

🚀 we just shipped support for vitest browser mode + workspaces ✅ thanks to @jess.sh for helping make this happen ❤️ github.com/nuxt/test-ut...

🔥 Experimental vitest support coming to Angular in a couple of weeks with support for: ‣ Watch mode ‣ Browser testing To try it out: ‣ npm i vitest jsdom --save-dev ‣ Update your angular.json ‣ Add a couple of imports

dominikg is telling a @vitest.dev and @svelte.dev love story at Svelte Summit

Really enjoying working with vitest.dev on a project that needs to be tested in Node, Safari, Firefox, and Chrome! My favorite bits: 1. Easy to setup headless browsers with Browser Mode 2. CLI runs in watch mode by default (and not on CI) 3. Has all the `assert` APIs I was used to 4. test.skipIf 🏆

thanks to @vitest.dev, this is one of the craziest numbers i've seen for tinylibs! 🤏 tinybench has +375,000 dependents on github alone! github.com/tinylibs/tin...

Using @storybook.js.org with @angular.dev and @vite.dev is about to get a whole lot easier 😎⚡ github.com/analogjs/ana...

Storybook 9 beta! So much blood/sweat/tears from @storybook.js.org and @vitest.dev teams to create the future of UI testing. Please kick the tires in your project to help us stabilize for GA. 🙏

Storybook Test It’s a batteries-included combo of the best UI development and testing tools: Storybook, @vitest.dev's browser mode, and @playwright.dev. Run interaction, accessibility, and visual tests with a click and get real-time feedback inside your Storybook.

We need your feedback regarding the benchmarking feature in Vitest! github.com/vitest-dev/v...

made this vitest snapshot serializer so we can make ANSI codes human-readable in snapshots probably a pretty far edge case but has helped us a lot

The various PRs all landed yesterday to move @typescript-eslint.io to using @vitest.dev for test runs. Great work by Arya who did most of the changes and the team for reviewing 🥳 Smaller install for maintainers, and faster test runs 🙌

A useful new(ish) @vitest.dev feature I almost missed is `expect.soft`! It allows us to have assertions that don't terminate test execution when they fail. This helps us iterate more quickly on failing tests.

Milestone: vitest crossed 10M weekly npm downloads! ⚡

After 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.

This 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.