vitest

Run unit tests in Vite projects with a Jest-compatible API.

Updated Apr 2, 2026

Search Tags:#typescript #vitest #testing #vite #unit-testing #esm

Ready to run

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

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/abereghici/skills/tree/main/skills/vitest
Command: npx skills add https://github.com/abereghici/skills --skill vitest-abereghici

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides a fast, integrated unit testing workflow for Vite-based projects, offering a Jest-compatible API out of the box.

Core Features & Use Cases

Vite-native transformation pipeline for rapid feedback during development
Jest-compatible API for easy migration and a rich ecosystem of plugins
Native ESM, TypeScript, and JSX support with zero-configuration testing
Smart watch mode and selective test runs to speed up feedback loops
Built-in coverage, snapshotting, and robust mocking utilities
Works well for unit tests, mocks, coverage, and test filtering in frontend projects

Quick Start

Install Vitest in your project and start writing tests 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 in a Vite project with TypeScript and ESM?▼

Unit testing in a Vite project requires a framework handling native ESM and TypeScript without extra configuration. Vitest provides a zero-configuration experience leveraging the Vite-native transformation pipeline to run tests instantly.

Is there a Jest-compatible unit testing framework for Vite?▼

A Jest-compatible unit testing framework for Vite allows easy migration and access to a rich plugin ecosystem. Vitest offers this compatibility out of the box, enabling developers to transition existing test suites into Vite-based projects smoothly.

What is the best way to speed up unit testing feedback loops in frontend projects?▼

Speeding up unit testing feedback loops requires a smart watch mode and selective test runs. Vitest uses the Vite-native pipeline for rapid feedback during development, filtering tests to execute only necessary suites and reducing wait times.

Does Vitest support snapshotting and mocking for TypeScript unit tests?▼

Vitest supports robust mocking utilities and built-in snapshotting for TypeScript unit tests. These features integrate directly with the Vite transformation pipeline, allowing developers to capture component states and isolate dependencies without additional configuration.

Can I get code coverage reports with zero-config unit testing in Vite?▼

Zero-config unit testing in Vite can generate code coverage reports natively. Vitest includes built-in coverage capabilities, allowing developers to measure test effectiveness directly without installing or configuring external coverage plugins.