Overview
vitest is an open-source testing skill for Claude Code and compatible agents, published by antfu. Its author describes it as: “Vitest fast unit testing framework powered by Vite with Jest-compatible API. Use when writing tests, mocking, configuring coverage, or working with test filtering and fixtures.”. The project has 5.8k stars on GitHub and is available under the MIT license. Add it to your setup with `git clone https://github.com/antfu/skills ~/.claude/skills/vitest`.
What vitest does
Vitest is a next-generation testing framework powered by Vite. It provides a Jest-compatible API with native ESM, TypeScript, and JSX support out of the box. Vitest shares the same config, transformers, resolvers, and plugins with your Vite app.
Best for
What’s inside
The SKILL.md for vitest is organised into these sections:
- Core
- Features
- Advanced
Installation
Add vitest to your agent with:
git clone https://github.com/antfu/skills ~/.claude/skills/vitestReview a skill’s source before installing it — skills can instruct your agent to run commands. This command comes from the skill’s public repository, which is the source of truth for setup steps. New to skills? Read how to install Claude Code skills.
Supported agents
Neither the skill nor its repository names a specific agent. It uses the SKILL.md format, which several agents can load — check the repository for any agent-specific requirements.
License
vitest is published under the MIT license.
Strengths
- Clear MIT license — safe to read and adapt within its terms
- Ships in antfu/skills, an established project with 5,770 GitHub stars
Author
Topics
Frequently asked questions
- What does vitest do?
- Vitest fast unit testing framework powered by Vite with Jest-compatible API. Use when writing tests, mocking, configuring coverage, or working with test filtering and fixtures.
- How do I install vitest?
- Run git clone https://github.com/antfu/skills ~/.claude/skills/vitest in your agent, then reload your skills. Review the source at https://github.com/antfu/skills before installing.
- Is vitest free to use?
- Yes. vitest is free and open source under the MIT license, so you can read, run, and adapt it within that license's terms.
- Where does vitest come from?
- vitest ships inside antfu/skills, a repository that contains 19 catalogued skills in total. The repository's 5,770 GitHub stars apply to that whole collection, not to this skill on its own.
