vitest — vitest install vitest, tool-box, community, vitest install, ide skills, vitest testing framework, vitest and vite, vitest for developers, Claude Code, Cursor, Windsurf

v2026.1.28
GitHub

About this Skill

Ideal for JavaScript Agents seeking fast and efficient testing solutions with native ESM, TypeScript, and JSX support. Vitest is a next-generation testing framework powered by Vite, offering native ESM, TypeScript, and JSX support out of the box.

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 support: Enables fast and efficient testing with ES modules
TypeScript support: Allows for seamless testing with TypeScript projects
JSX support: Enables testing of JSX components out of the box

# Core Topics

vitest install vitest testing framework vitest and vite vitest for developers
DanielShuguang DanielShuguang
[0]
[0]
Updated: 3/8/2026

Agent Capability Analysis

The vitest skill by DanielShuguang is an open-source community AI agent skill for Claude Code and other IDE workflows, helping agents execute tasks with better context, repeatability, and domain-specific guidance. Optimized for vitest install, vitest testing framework, vitest and vite.

Ideal Agent Persona

Ideal for JavaScript Agents seeking fast and efficient testing solutions with native ESM, TypeScript, and JSX support.

Core Value

Empowers agents to leverage Vite's transformation pipeline for fast HMR-like test updates, utilizing Jest-compatible APIs and smart watch modes that only rerun affected tests based on module graphs, all while supporting native ESM, TypeScript, and JSX.

↓ Capabilities Granted for vitest

Automating testing for Vite applications with Jest-compatible test suites
Debugging JavaScript applications using Vitest's smart watch mode
Optimizing test suites for faster execution with Vitest's native ESM support

! Prerequisites & Limits

  • Requires Vite configuration and setup
  • Limited to JavaScript and TypeScript projects
Labs Demo

Browser Sandbox Environment

⚡️ Ready to unleash?

Experience this Agent in a zero-setup browser environment powered by WebContainers. No installation required.

Boot Container Sandbox

vitest

Install vitest, an AI agent skill for AI agent workflows and automation. Works with Claude Code, Cursor, and Windsurf with one-command setup.

SKILL.md
Readonly

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 3.x, generated at 2026-01-28.

Core

TopicDescriptionReference
ConfigurationVitest and Vite config integration, defineConfig usagecore-config
CLICommand line interface, commands and optionscore-cli
Test APItest/it function, modifiers like skip, only, concurrentcore-test-api
Describe APIdescribe/suite for grouping tests and nested suitescore-describe
Expect APIAssertions with toBe, toEqual, matchers and asymmetric matcherscore-expect
HooksbeforeEach, afterEach, beforeAll, afterAll, aroundEachcore-hooks

Features

TopicDescriptionReference
MockingMock functions, modules, timers, dates with vi utilitiesfeatures-mocking
SnapshotsSnapshot testing with toMatchSnapshot and inline snapshotsfeatures-snapshots
CoverageCode coverage with V8 or Istanbul providersfeatures-coverage
Test ContextTest fixtures, context.expect, test.extend for custom fixturesfeatures-context
ConcurrencyConcurrent tests, parallel execution, shardingfeatures-concurrency
FilteringFilter tests by name, file patterns, tagsfeatures-filtering

Advanced

TopicDescriptionReference
Vi Utilitiesvi helper: mock, spyOn, fake timers, hoisted, waitForadvanced-vi
EnvironmentsTest environments: node, jsdom, happy-dom, customadvanced-environments
Type TestingType-level testing with expectTypeOf and assertTypeadvanced-type-testing
ProjectsMulti-project workspaces, different configs per projectadvanced-projects

FAQ & Installation Steps

These questions and steps mirror the structured data on this page for better search understanding.

? Frequently Asked Questions

What is vitest?

Ideal for JavaScript Agents seeking fast and efficient testing solutions with native ESM, TypeScript, and JSX support. Vitest is a next-generation testing framework powered by Vite, offering native ESM, TypeScript, and JSX support out of the box.

How do I install vitest?

Run the command: npx killer-skills add DanielShuguang/tool-box/vitest. It works with Cursor, Windsurf, VS Code, Claude Code, and 19+ other IDEs.

What are the use cases for vitest?

Key use cases include: Automating testing for Vite applications with Jest-compatible test suites, Debugging JavaScript applications using Vitest's smart watch mode, Optimizing test suites for faster execution with Vitest's native ESM support.

Which IDEs are compatible with vitest?

This skill is compatible with Cursor, Windsurf, VS Code, Trae, Claude Code, OpenClaw, Aider, Codex, OpenCode, Goose, Cline, Roo Code, Kiro, Augment Code, Continue, GitHub Copilot, Sourcegraph Cody, and Amazon Q Developer. Use the Killer-Skills CLI for universal one-command installation.

Are there any limitations for vitest?

Requires Vite configuration and setup. Limited to JavaScript and TypeScript projects.

↓ How To Install

  1. 1. Open your terminal

    Open the terminal or command line in your project directory.

  2. 2. Run the install command

    Run: npx killer-skills add DanielShuguang/tool-box/vitest. The CLI will automatically detect your IDE or AI agent and configure the skill.

  3. 3. Start using the skill

    The skill is now active. Your AI agent can use vitest immediately in the current project.

Related Skills

Looking for an alternative to vitest or another community skill for your workflow? Explore these related open-source skills.

View All

widget-generator

Logo of f
f

f.k.a. Awesome ChatGPT Prompts. Share, discover, and collect prompts from the community. Free and open source — self-host for your organization with complete privacy.

★ 149.6k
⑂ 0
AI

flags

Logo of vercel
vercel

flags is a Next.js feature management skill that enables developers to efficiently add or modify framework feature flags, streamlining React application development.

★ 138.4k
⑂ 0
Browser

zustand

Logo of lobehub
lobehub

The ultimate space for work and life — to find, build, and collaborate with agent teammates that grow with you. We are taking agent harness to the next level — enabling multi-agent collaboration, effortless agent team design, and introducing agents as the unit of work interaction.

★ 72.8k
⑂ 0
AI

data-fetching

Logo of lobehub
lobehub

The ultimate space for work and life — to find, build, and collaborate with agent teammates that grow with you. We are taking agent harness to the next level — enabling multi-agent collaboration, effortless agent team design, and introducing agents as the unit of work interaction.

★ 72.8k
⑂ 0
AI