vitest

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

68|1|Updated Jan 14, 2026

Search Tags:#typescript #vitest #testing #javascript #coverage #mocking

Ready to run

npx skills add https://github.com/knoopx/pi --skill vitest-knoopx

💬 Prompt for ChatGPT / Claude Chat▼

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.