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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
One-click install
npx skills add https://github.com/abereghici/skills --skill vitest-abereghici
Or copy as Structured Prompt for Agent▼
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.

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