Testing framework powered by @vite_js ⚡️, brought to you by @voidzerodev | Bluesky: bsky.app/profile/vitest.dev 🦋
Joined December 2021
- Tweets 399
- Following 27
- Followers 31,862
- Likes 859
25 Photos and videos
Pinned Tweet
22 Oct 2025
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
4
163
931
103,640
Vitest retweeted
Jun 4
VoidZero is joining Cloudflare.
Our mission stays the same: to make JavaScript developers more productive than ever before. Vite, Vitest, Rolldown, Oxc, and Vite remain MIT-licensed. Evan and the VoidZero team will continue leading them.
Cloudflare shares our commitment to open source. Together, we can keep investing in the tooling developers rely on every day, while bringing the Vite ecosystem and Cloudflare’s platform even closer together.
218
717
4,922
828,241
Jun 1
We've published a Browser Mode security advisory.
CDP-capable providers like Playwright Chromium with the browser API exposed to the network allowed attackers to run code on the host.
Update vitest/browser to 5.0.0-beta.4, 4.1.8, or 3.2.6.
Vite users: Upgrade to 0.1.24
1
6
43
12,643
Jun 1
3
2,147
Vitest retweeted
May 28
We’re launching early access for Vitest visual testing with Chromatic! ⚡️
Built with @vitest_dev core maintainer Ari Perkkio, Chromatic adds visual testing to the browser tests you already write. 🧵 (1/4)
ALT vitest-chromatic-integration-early-access-program
1
4
34
6,493
May 19
🚨 We are publishing Vitest 4.1.6 and Vitest 5.0.0-beta.3 to resolve recent vulnerabilities:
- `--api` and `--ui` exposed arbitrary files to the network
- `--api` allowed arbitrary execution
- `?otelCarrier` XSS
More information on our GitHub security page
4
16
164
28,807
Mar 12
Vitest 4.1 is out! 🚀
✅ Vite 8 support from day 1
🏷️ Test tags to organize, filter & apply shared options
🪝 New hooks for easier tracing, transactions and AsyncLocalStorage
🔍 Async leak detection
🤖 Agent reporter to reduce token usage
And much more!
6
94
979
59,023
Feb 28
Feb 28
In the next version of Claude Code..
We're introducing two new Skills: /simplify and /batch. I have been using both daily, and am excited to share them with everyone.
Combined, these kills automate much of the work it used to take to (1) shepherd a pull request to production and (2) perform straightforward, parallelizable code migrations.
2
43
7,219
Vitest retweeted
Feb 18
Flaky tests and memory leaks are the worst.
@vitest_dev now has a --detect-async-leaks flag that catches uncleared intervals, lingering servers, and other async operations leaking across your tests.
⚠️ Don't run it on every run though. Use it to audit your test suite, then clean things up.
Available in the latest 4.1 beta. Big shout out to Ari from the Vitest team for landing this PR! 🔥
7
34
257
49,220
Vitest retweeted
Feb 11
Tests.
Vitest's browser mode is stable since Vitest 4.0.
Now you can be sure that your tests pass in an *actual* browser environment.
vitest.dev/guide/browser/
ALT "Expanding brain meme with 5 stages. Stage 1 (small brain): 'No tests'. Stage 2: 'Testing components by mocking document and window'. Stage 3: 'Testing with jsdom as fake DOM'. Stage 4: 'Testing with happy-dom because jsdom is too slow'. Stage 5 (galaxy brain): 'Testing in an ACTUAL browser with Vitest Browser Mode' with Vitest logo."
4
9
115
10,995
Vitest retweeted
Feb 5
✨ What's New in ViteLand: January 2026 Recap
◆ Unified redesign across all VoidZero sites
◆ @vite_js crossed 3 billion npm downloads
◆ @rolldown_rs reached RC status
◆ Lazy Barrel Optimization landed in Rolldown
◆ Oxfmt hit 100% Prettier conformance
◆ Oxlint gets a dynamic .ts config
◆ ...and much more 👀
Full recap below!
1
20
145
21,445
Vitest retweeted
Jan 21
The first beta for @vitest_dev 4.1 is out! 🧪
What's new:
◆ Chai-style spy assertions (`toHaveBeenCalled`, etc.)
◆ `userEvent.wheel()` for browser mode
◆ Enhanced retry options for flaky tests
◆ Disposable returned from `doMock()`
◆ Respecting coverage ignore start/stop hints
◆ and more 👀
Try now by installing vitest@beta
1
15
150
16,912
Vitest retweeted
Jan 13
New Year. New Look. Same Mission.
Make JavaScript developers more productive than ever before
14
58
542
126,214
Vitest retweeted
26 Nov 2025
Want to speed up subsequent @vitest_dev runs?
Then try out the new experimental file-system based cache ✨
⋄ Caches transformed modules
⋄ Does *not* work with browser mode yet
⋄ Can be manually cleared via `vitest --clearCache`
More in the docs
vitest.dev/config/experiment…
ALT Vitest’s Experimental FS Cache Enable via CLI or config: `pnpm vitest --experimental.fsModuleCache` First run does not change timings. There is no cache yet! An image with statistics about the test run with 3088 tests passed and 6.17s testing duration, transform taking 5.32s, setup 461ms and collect 18.50s. Subsequent runs use the file system cache, reducing transform times Another statistics image. The subsequent run now takes only 5.14s, with transform time down to 673ms, setup to 341ms and collection time down to 13.20s
4
8
95
8,107
Vitest retweeted
9 Sep 2025
I started a proof of concept to integrate the standard schema natively into @vitest_dev
It's currently being discussed integrating this directly into `toEqual()`, creating a new custom matcher like `toEqualSchema()` or an asymmetric matcher like `schemaMatching()`
21 Aug 2025
What if we can turn
`expect(url).toMatch(/^(?!\\.)(?!.*\\.\\.)([A-Za-z0-9_' \\-\\.]*)[A-Za-z0-9_ -]@([A-Za-z0-9][A-Za-z0-9\\-]*\\.) [A-Za-z]{2,}$/)`
into
`expect(url).toMatchSchema(z.url())`?
I created a custom matcher for @vitest_dev to validate data against any schema
2
4
51
7,991
Vitest retweeted
1 Sep 2025
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
ALT void(0) - What's New in ViteLand? August 2025 Recap
3
16
70
18,459
⚡ Speaker highlight: Jessica Sachs, FOSS Nerd at @HeroDevs
The Vitest Browser mode is one of the most exciting features of @vitest_dev!
@_jessicasachs will reveal what makes it so powerful, moving beyond JSDOM. You’ll learn how you can use it for component testing and even cases beyond that - and which new capabilities the browser mode got (looking at you visual regression testing 👀)
A game-changer for testing! ✅
Watch the talk live - viteconf.amsterdam/
ALT ViteConf 2025 speaker card of Jessica Sachs, who is an FOSS Enthusiast and working at HeroDevs. Her talk will be all around the Vitest Browser Mode
7
36
15,355
⚡ Speaker highlight: Vladimir Sheremet, Core Maintainer of @vitest_dev
The "State of Vitest" is a must-see! Vladimir will give us the official update on the most interesting testing framework out there, covering the latest features, performance boosts, and what's next for the Vite-powered testing experience. ✅
Don’t write tests yet? You better get started 👀
And then, get your ticket for the first in-person ViteConf at viteconf.amsterdam
7
27
15,641