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antfu/skills

vitest

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.

All-time #665 Trending #1023 Hot #6247 First seen Jan 28, 2026
8-week activity · all time api

Installation

$ npx skills add antfu/skills --skill vitest
View on skills.sh ↗ GitHub repository ↗

Summary

  • Vite-powered unit testing framework with Jest-compatible API and native ESM support.
  • Shares Vite's config, transformers, and plugins; supports TypeScript, JSX, and ESM without extra setup Smart watch mode reruns only affected tests based on module graph; multi-threaded workers enable parallel execution Comprehensive testing utilities: test/describe/expect API, mocking (functions, modules, timers), snapshots, and fixtures Built-in code coverage via V8 or Istanbul; test filtering by name, file patterns, and tags Advanced features include type-level testing, custom environments (node, jsdom, happy-dom), and multi-project workspaces

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Security audits

Partner security reviews for this skill.

agent-trust-hub SAFE

Analyzed Feb 17, 2026

The skill consists of documentation and code examples for the Vitest testing framework. It contains no malicious scripts, executable code, or data exfiltration patterns. All referenced dependencies are standard, well-known packages used within the JavaScript development ecosystem.

snyk LOW

Analyzed Feb 17, 2026

No issues detected.

socket Score 0.9000 · 0 alerts

Analyzed Mar 18, 2026

  • license 1
  • maintenance 1
  • quality 0.9
  • supply chain 1
  • vulnerability 1

0 alerts

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More details

Agent compatibility

Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.

Claude Code Not declared
Cursor Not declared
Codex Not declared
GitHub Copilot Not declared
Windsurf Not declared
Gemini CLI Not declared
Cline Not declared
OpenCode Not declared

Repository health

Stars 5.9K
License LICENSE.md
Default branch main
Open issues 9
Status Active

Skill metadata

Parsed from SKILL.md frontmatter.

Version2026.6.22
More metadata
author
Anthony Fu
version
2026.6.22
source
Generated from https://github.com/vitest-dev/vitest, scripts located at https://github.com/antfu/skills

Package contents

Files included with this skill beyond the listing page.

  • skill md SKILL.md 3,713 B
  • docs SUMMARY.md 187 B

History

  1. First seen on skills.sh
  2. First recorded snapshot · 35,144 installs

SKILL.md

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

Topic Description Reference
Configuration Vitest and Vite config integration, defineConfig usage [core-config](references/core-config.md)
CLI Command line interface, commands and options [core-cli](references/core-cli.md)
Test API test/it function, modifiers like skip, only, concurrent [core-test-api](references/core-test-api.md)
Describe API describe/suite for grouping tests and nested suites [core-describe](references/core-describe.md)
Expect API Assertions with toBe, toEqual, matchers and asymmetric matchers [core-expect](references/core-expect.md)
Hooks beforeEach, afterEach, beforeAll, afterAll, aroundEach [core-hooks](references/core-hooks.md)

Features

Topic Description Reference
Mocking Mock functions, modules, timers, dates with vi utilities [features-mocking](references/features-mocking.md)
Snapshots Snapshot testing with toMatchSnapshot and inline snapshots [features-snapshots](references/features-snapshots.md)
Coverage Code coverage with V8 or Istanbul providers [features-coverage](references/features-coverage.md)
Test Context Test fixtures, context.expect, test.extend for custom fixtures [features-context](references/features-context.md)
Concurrency Concurrent tests, parallel execution, sharding [features-concurrency](references/features-concurrency.md)
Filtering Filter tests by name, file patterns, tags [features-filtering](references/features-filtering.md)
Test Tags Label tests with tags to filter runs and apply shared options [features-test-tags](references/features-test-tags.md)
Reporters Built-in reporters, default selection, CI/output config [features-reporters](references/features-reporters.md)
Benchmarking Write benchmarks with the bench fixture (Tinybench) [features-benchmarking](references/features-benchmarking.md)

Advanced

Topic Description Reference
Vi Utilities vi helper: mock, spyOn, fake timers, hoisted, waitFor [advanced-vi](references/advanced-vi.md)
Environments Test environments: node, jsdom, happy-dom, custom [advanced-environments](references/advanced-environments.md)
Type Testing Type-level testing with expectTypeOf and assertType [advanced-type-testing](references/advanced-type-testing.md)
Projects Multi-project workspaces, different configs per project [advanced-projects](references/advanced-projects.md)