Vitest

by antfu

Vitest is a Quality skill for Claude Code, published by antfu in skills.

5.8K stars317 forkson antfu/skillsAdded 2026/08/15Repository updated 2026/06/23

View source on GitHub Download repo ZIP

agent-skillsskills

Install in seconds

Install Vitest

Copy Vitest into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/antfu/skills/tree/main/skills/vitest ~/.claude/skills/vitest

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/antfu/skills.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: skills/vitest/SKILL.md in antfu/skills
Installs to: ~/.claude/skills/vitest
Collection: One of 19 skills cataloged from this repository
Category: Quality — 1354 skills

What Vitest does

Vitest is a fast unit testing framework powered by Vite with a Jest-compatible API. Use it when writing tests, mocking, configuring coverage, or working with test filtering and fixtures.

Vitest is cataloged under Quality on DirSkills. Vitest comes from a repository tagged agent-skills and skills.

Documentation

README

Excerpt

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.

Key Features:

Vite-native: Uses Vite's transformation pipeline for fast HMR-like test updates
Jest-compatible: Drop-in replacement for most Jest test suites
Smart watch mode: Only reruns affected tests based on module graph
Native ESM, TypeScript, JSX support without configuration
Multi-threaded workers for parallel test execution
Built-in coverage via V8 or Istanbul
Snapshot testing, mocking, and spy utilities

The skill is based on Vitest 5.x (beta), generated at 2026-06-22.

Core

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Vitest

What else does antfu publish alongside Vitest?
Vitest is one of 19 skills that DirSkills catalogs from antfu/skills, the repository it ships in. Its siblings there include Antfu Design, Anthony Fu Conventions and Nitro. Each one is a separate skill with its own page in this directory, installs the same way Vitest does, and is maintained by antfu in that same repository. The rest of the collection is listed on the antfu/skills page.
How does Vitest compare to other Quality skills?
Vitest ranks #272 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Vitest against them. Open each page to compare what they document and how they install.