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vitest

Run Jest-compatible unit tests in Vite projects with coverage and snapshots.

Updated Feb 7, 2026
Search Tags:#typescript#vitest#testing#vite#unit-testing#jest-compatible
One-click install
npx skills add https://github.com/jd-solanki/lekhan-internal-sync --skill vitest-jd-solanki
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/jd-solanki/lekhan-internal-sync/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/jd-solanki/lekhan-internal-sync --skill vitest-jd-solanki

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest enables fast, Jest-compatible unit testing for Vite-based projects, helping teams validate code behavior with minimal wait times.

Core Features & Use Cases

  • Jest-compatible API with Vite-native test execution for rapid feedback
  • Built-in coverage, snapshot testing, mocking, and fixtures for comprehensive testing
  • Supports TypeScript, native ESM, and JSX with smart watch mode and parallel execution

Quick Start

Install Vitest in your project, initialize a basic config, and start testing. For example, install with npm i -D vitest, add a vitest.config.ts (or extend vite.config.ts), and run 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 run unit tests in a Vite project without slow execution times?▼

Vitest enables fast unit testing in Vite projects by providing a Jest-compatible API with native Vite execution, smart watch mode, and multi-threaded workers for rapid feedback. It requires a Vitest-configured project and a compatible Vite-based structure.

Can I use Jest-compatible syntax and matchers for TypeScript testing?▼

Yes, Vitest provides a Jest-compatible API allowing you to write TypeScript tests using familiar syntax and matchers. It supports native ESM, JSX, and TypeScript out of the box without requiring extra configuration.

How do I set up unit testing with coverage and mocking for a TypeScript codebase?▼

Install Vitest via npm i -D vitest, add a vitest.config.ts file, and run vitest to execute tests. It includes built-in coverage via V8 or Istanbul, snapshot testing, mocking, and fixtures for comprehensive TypeScript codebase validation.

Does Vitest support native ESM and JSX out of the box?▼

Yes, Vitest supports native ESM, TypeScript, and JSX directly without additional configuration. It leverages Vite's native transform pipeline to handle these formats seamlessly during test execution.

What is the best way to migrate from Jest to Vite for faster test execution?▼

Vitest is the best way to achieve faster test execution in Vite projects because it offers a Jest-compatible API, allowing direct migration of existing tests. It utilizes Vite's native execution pipeline and multi-threaded workers for significant speed improvements.

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