vitest

Run Vite-powered unit tests for JavaScript and TypeScript projects.

1|Updated Feb 2, 2026

Search Tags:#typescript #vitest #testing #vite #unit-testing #snapshots #jest-compatible

Ready to run

npx skills add https://github.com/junwen-k/cookie-store --skill vitest-junwen-k

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Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/junwen-k/cookie-store/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/junwen-k/cookie-store --skill vitest-junwen-k

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides a fast, modern testing experience for JavaScript/TypeScript projects with a Jest-compatible API powered by Vite.

Core Features & Use Cases

Vite-native test runner with fast feedback and hot module replacement style updates
Jest-compatible APIs (test, expect, describe) with built-in mocking, snapshots, and coverage
Integrates with TypeScript and multi-project configurations for scalable test suites

Quick Start

Install Vitest with npm i -D vitest, then create a vitest.config.ts as needed, and run tests with npx vitest or npm run test.

Frequently Asked Questions about vitest

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

FAQPage Schema

How do I set up unit testing for a Vite and TypeScript project?▼

You can run unit tests for React, Vue, Svelte, Solid, and Preact workflows using a Vite-native test runner that provides Jest-compatible APIs for writing tests, mocks, and fixtures.

Can I use Jest-compatible APIs for mocking and snapshots in Vite?▼

Yes, Vitest provides Jest-compatible APIs including test, expect, and describe, with built-in support for mocking, snapshots, and coverage directly within your Vite-powered test runner.

Does unit testing with Vitest support multi-project configurations?▼

Unit testing with Vitest supports multi-project configurations, allowing you to scale test suites across TypeScript projects while integrating seamlessly with your existing Vite setup.

What is the best way to get fast feedback during JavaScript unit testing?▼

Fast feedback during JavaScript unit testing is achieved by using a Vite-native runner with hot module replacement style updates, providing immediate results as you modify your code.

Do I need to configure vitest.config.ts to run basic unit tests?▼

You do not need to configure vitest.config.ts to run basic unit tests; installation via npm and running npx vitest is sufficient, though configuration unlocks snapshots and multi-project testing.