vitest

Execute unit tests for JavaScript and TypeScript code with Vitest.

Updated Jan 8, 2026

Search Tags:#unit testing #TypeScript #Vitest #JavaScript #test runner

Ready to run

npx skills add https://github.com/nutrisari-jeruk/react-vite-template --skill vitest-nutrisari-jeruk

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/nutrisari-jeruk/react-vite-template/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/nutrisari-jeruk/react-vite-template --skill vitest-nutrisari-jeruk

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires vitest, vite, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill provides a fast and efficient unit testing solution for JavaScript and TypeScript projects, allowing developers to quickly identify and fix issues in their code.

Core Features & Use Cases

Jest-Compatible API: Seamless integration with most Jest test suites.
Smart Watch Mode: Runs only affected tests based on module graph.
Parallel Execution: Multi-threaded workers for faster test execution.
Native ESM, TypeScript, JSX Support: Out-of-the-box support with no configuration needed.
Use Cases: Ideal for testing individual components, libraries, or entire applications.

Quick Start

Run the 'vitest' skill to execute all tests in your project.

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 TypeScript and JavaScript without complex configuration?▼

You can execute unit tests for JavaScript and TypeScript with native ESM, TypeScript, and JSX support out of the box. This testing process requires no initial configuration to get started with running your test suites.

What is the best way to speed up unit test execution for modern web applications?▼

Speed up unit test execution by leveraging multi-threaded workers for parallel execution. Smart watch mode further accelerates the process by running only affected tests based on your project's module graph.

Do I need Vite installed to run Vitest tests in my project?▼

Yes, you need both Vitest and Vite installed in your environment to execute the tests. Vite provides the underlying build and module resolution infrastructure required by the test runner.

Can I migrate my existing Jest test suites to this test runner easily?▼

Yes, you can migrate existing Jest test suites easily because it provides a Jest-compatible API. This allows for seamless integration with most of your current JavaScript and TypeScript tests.

How does smart watch mode identify which unit tests to run?▼

Smart watch mode identifies which unit tests to run by analyzing the module graph to execute only the affected tests. This ensures faster feedback loops during continuous development.