vitest

Run Jest-compatible unit tests in Vite projects with TypeScript and JSX.

5|1|Updated Feb 11, 2026

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

Ready to run

npx skills add https://github.com/Tristan578/project-forge --skill vitest-tristan578

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/Tristan578/project-forge/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/Tristan578/project-forge --skill vitest-tristan578

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Provides a fast, Jest-compatible unit testing experience for Vite apps, with native ESModule support, TypeScript and JSX, and seamless integration with Vite config and tooling.

Core Features & Use Cases

Vite-native test runner with fast feedback and HMR-like updates
Jest-compatible API for familiar test writing and easy migration
Built-in coverage, mocking, and test filtering to manage large suites
Common use cases include UI component testing, library validation, and test-driven development for modern frontend projects
Use case: quickly validate a new React or Vue component as you iterate in a Vite-based project

Quick Start

Install Vitest in your project and run your first test with vitest

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 project using TypeScript and ES Modules?▼

Unit testing for a Vite project uses a Vite-native test runner with native ES Module support and TypeScript. It provides a Jest-compatible API, allowing you to write tests seamlessly without modifying your existing Vite configuration.

Can I migrate my existing Jest tests to a Vite-based testing framework easily?▼

Migrating Jest tests to a Vite-based testing framework is straightforward because it offers a Jest-compatible API. You can transition your existing test suites directly while gaining native ESM support and faster feedback through HMR-like updates.

Does Vitest support built-in coverage and mocking for React and Vue components?▼

Vitest supports built-in coverage and mocking for React and Vue components. It enables fast validation and test-driven development for modern frontend projects by integrating directly with your Vite tooling.

What is the best way to run parallel test execution across multiple files in Vite?▼

Parallel test execution across multiple files in Vite is handled natively by the test runner. It provides fast feedback and includes test filtering to help manage large test suites efficiently during development.

Why should I choose a Vite-native test runner over other testing frameworks?▼

A Vite-native test runner leverages your existing Vite config for faster HMR-like updates and native ESM support. It differentiates itself by providing built-in coverage, mocking, and snapshots specifically optimized for Vite-based projects.