vitest

Run JavaScript and TypeScript tests with mocking, setup files, and coverage reporting.

68|1|Updated Jan 14, 2026
One-click install
npx skills add https://github.com/knoopx/pi --skill vitest-knoopx
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/knoopx/pi/tree/main/agent/skills/vitest
Command: npx skills add https://github.com/knoopx/pi --skill vitest-knoopx

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest enables fast, reliable JavaScript/TypeScript test execution in a Vite-powered environment.

Core Features & Use Cases

  • Unit, integration, and UI testing for modern front-end and Node.js projects.
  • Mocking, setup files, and coverage reporting to improve test reliability.
  • Use case: quickly validate code changes during development and CI.

Quick Start

Install vitest as a dev dependency and create a minimal config, then run tests with bun vitest run.

Frequently Asked Questions about vitest

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I set up fast TypeScript testing for my Vite project?

Fast TypeScript testing requires installing the vitest package as a dev dependency and creating a minimal vitest.config.ts file to define test suites, then executing test runs through your Node.js package manager.

Can I use vitest for both Node.js and browser integration tests?

Vitest supports integrated test execution across both Node.js and browser environments, allowing you to validate unit, integration, and UI tests for modern front-end and Node.js projects within a single configuration.

What's the best way to configure mocking and coverage reporting in JavaScript tests?

Configuring mocking and coverage reporting involves using Vitest's built-in features alongside setup files within your vitest.config.ts, enabling fast and reliable test execution while tracking code coverage metrics.

Do I need a specific package manager to run Vitest tests?

Vitest requires Node.js and a package manager to install the vitest package, allowing you to execute tests using commands like `bun vitest run` or standard npm scripts.

How does Vitest speed up test execution for modern JavaScript projects?

Vitest achieves fast test execution by leveraging a Vite-powered environment, providing quick validation of code changes during development and CI pipelines without leaving your existing build setup.