vitest

Run unit tests and generate coverage reports for JavaScript and TypeScript projects.

Updated Mar 8, 2026
One-click install
npx skills add https://github.com/martinezharo/fewya --skill vitest-martinezharo
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/martinezharo/fewya/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/martinezharo/fewya --skill vitest-martinezharo

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest solves the friction of slow, complex testing setups by providing a high-performance, Vite-native framework that integrates seamlessly with your existing development environment.

Core Features & Use Cases

  • Vite-Native Performance: Leverages Vite's transformation pipeline for near-instant test updates and HMR-like feedback.
  • Jest Compatibility: Offers a drop-in replacement for Jest, allowing you to migrate existing suites with minimal configuration changes.
  • Advanced Testing Capabilities: Includes built-in support for mocking, snapshot testing, code coverage, and multi-threaded parallel execution.

Quick Start

Use the vitest skill to run all unit tests in the current project and generate a coverage report.

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 for my Vite and TypeScript application?

You can run unit tests for Vite and TypeScript applications using a Vite-native framework that leverages Vite's transformation pipeline for near-instant test updates and multi-threaded parallel execution.

Can I migrate my Jest test suites to a Vite-native testing framework?

Yes, you can migrate Jest test suites to a Vite-native framework because it offers Jest-compatible APIs, allowing you to transition existing tests with minimal configuration changes.

How do I generate code coverage reports when unit testing JavaScript applications?

You can generate code coverage reports within a unified configuration environment by using a testing framework that includes built-in coverage analysis alongside mocking and snapshotting capabilities.

What is the best way to handle mocking in TypeScript unit tests?

The best way to handle mocking in TypeScript unit tests is using a framework with built-in advanced mocking capabilities that operates natively within your Vite transformation pipeline.

Does Vite-native testing support snapshot testing for JavaScript components?

Yes, Vite-native testing supports snapshot testing for JavaScript components as part of its advanced testing capabilities, alongside built-in mocking and code coverage analysis.

Why are my unit tests slow when using TypeScript, and how can Vite help?

Unit tests are often slow due to complex setups, but using a Vite-native testing framework solves this friction by leveraging Vite's pipeline for high-performance, HMR-like feedback during test execution.