vitest — community vitest, vitest-perf-benchmarks, community, ide skills, Claude Code, Cursor, Windsurf

v2026.1.28
GitHub

About this Skill

Ideal for JavaScript Agents requiring high-performance testing frameworks with native ESM and TypeScript support. vitest jsdom vs browser mode

ixahmedxi ixahmedxi
[0]
[0]
Updated: 3/5/2026

Agent Capability Analysis

The vitest skill by ixahmedxi 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.

Ideal Agent Persona

Ideal for JavaScript Agents requiring high-performance testing frameworks with native ESM and TypeScript support.

Core Value

Empowers agents to leverage Vite-native testing with Jest-compatible APIs, utilizing jsdom and browser modes for efficient test updates and smart watch modes for optimized test reruns, all while supporting JSX and native ESM.

↓ Capabilities Granted for vitest

Rerunning affected tests based on module graphs
Utilizing Vite's transformation pipeline for fast HMR-like test updates
Migrating Jest test suites to Vitest for improved performance

! Prerequisites & Limits

  • Requires Vite configuration and setup
  • Limited to JavaScript and TypeScript environments
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 requiring high-performance testing frameworks with native ESM and TypeScript support. vitest jsdom vs browser mode

How do I install vitest?

Run the command: npx killer-skills add ixahmedxi/vitest-perf-benchmarks/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: Rerunning affected tests based on module graphs, Utilizing Vite's transformation pipeline for fast HMR-like test updates, Migrating Jest test suites to Vitest for improved performance.

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 environments.

↓ 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 ixahmedxi/vitest-perf-benchmarks/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.

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