vitest

Run Vitest unit tests for JavaScript and TypeScript projects with Vite integration.

3|3|Updated Jun 1, 2026

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

Ready to run

npx skills add https://github.com/lawalletio/lawallet-nwc --skill vitest-lawalletio

💬 Prompt for ChatGPT / Claude Chat▼

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

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Vitest accelerates and simplifies unit testing for modern JavaScript and TypeScript projects by integrating tightly with Vite, offering a Jest-compatible API, fast feedback, and powerful built-in features.

Core Features & Use Cases

Vite-native: leverages Vite's transformation pipeline for fast test execution
Jest-compatible API: familiar test, expect, and mocking surface with native ESM support
TypeScript & JSX support: seamless TS/JSX testing without heavy configuration
Snapshots, Mocking, and Coverage: built-in snapshot testing, mocking utilities, and code coverage
Use Cases: local development, CI pipelines, and rapid TDD workflows

Quick Start

Install Vitest in your project and run the vitest command to start testing.

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 a Vite project using TypeScript?▼

Vitest provides fast unit testing for Vite projects by natively leveraging Vite's transformation pipeline, ensuring seamless TypeScript and JSX execution without heavy configuration.

Can I use a Jest-compatible API with native ESM for JavaScript testing?▼

Vitest supports a Jest-compatible API for JavaScript testing, allowing familiar test, expect, and mocking surfaces while providing native ESM support for modern development workflows.

How do I configure code coverage and mocking in my testing workflow?▼

Vitest includes built-in code coverage configuration and mocking utilities, enabling you to implement snapshot testing and mock modules directly within your local development and CI workflows.

What is the best way to speed up TypeScript unit testing in CI pipelines?▼

Vitest accelerates TypeScript unit testing in CI pipelines by tightly integrating with Vite's transformation pipeline, offering fast feedback and powerful built-in features like watch mode and snapshots.

Does Vitest work with JSX and TypeScript without heavy configuration?▼

Vitest works seamlessly with TypeScript and JSX testing without heavy configuration, natively supporting both formats through Vite's transformation pipeline for rapid test execution.