vitest

Run Jest-compatible unit tests in Vite-based JavaScript and TypeScript projects.

1|Updated Jan 7, 2025
One-click install
npx skills add https://github.com/Y2138/vue3-mono --skill vitest-y2138
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/Y2138/vue3-mono/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/Y2138/vue3-mono --skill vitest-y2138

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides a fast, developer-friendly testing framework for modern JavaScript and TypeScript projects, boosting feedback loops by integrating tightly with Vite and offering a Jest-compatible API.

Core Features & Use Cases

  • Vite-native test runner with near-instant feedback and hot module replacement for tests
  • Jest-compatible API for familiar test writing, mocks, and expectations
  • Rich support for coverage, snapshots, fixtures, and multi-project configurations in monorepos

Quick Start

Run Vitest in your project to execute fast unit tests with a Jest-compatible API.

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 using a Jest-compatible API?

To run unit tests in a Vite project with a Jest-compatible API, use Vitest. It integrates natively with Vite to provide near-instant feedback, supporting familiar mocks, expectations, and snapshot testing for JavaScript and TypeScript applications.

Does Vitest work with Vue 3 components and monorepo configurations?

Yes, Vitest works with Vue 3 components and monorepo configurations. It supports multi-project setups, enabling you to execute fast unit tests, apply mocks, and generate coverage reports across complex JavaScript and TypeScript application structures.

What is the best way to get fast feedback when testing JavaScript and TypeScript apps?

The best way to get fast feedback when testing JavaScript and TypeScript apps is using a Vite-native test runner. Vitest leverages Vite's hot module replacement for tests, offering near-instant feedback and Jest-compatible test writing capabilities.

Can I generate coverage reports and use test fixtures in Vitest?

Yes, you can generate coverage reports and use test fixtures in Vitest. The framework provides rich built-in support for coverage analysis, snapshots, and fixtures, automating these tasks within your Vite-based JavaScript and TypeScript projects.

Why use a Vite-native test runner instead of traditional JavaScript testing frameworks?

Use a Vite-native test runner to boost feedback loops by integrating tightly with Vite. Unlike traditional JavaScript testing frameworks, Vitest offers Jest-compatible API features while utilizing Vite's processing pipeline for faster test execution.

Do I need a specific project structure to automate Jest-compatible testing in Vite apps?

You need a root SKILL.md file with YAML frontmatter containing name and description, plus optional GENERATION.md and references. This structure allows Vitest to automate Jest-compatible testing, filtering, and mocks in your Vite apps effectively.