vitest

Run Vite-integrated unit tests with a Jest-compatible API.

1|Updated Mar 30, 2026

Search Tags:#typescript #vitest #testing #vite #unit-tests #esm

Ready to run

npx skills add https://github.com/mateo-khalil/sumate-ya --skill vitest-mateo-khalil

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/mateo-khalil/sumate-ya/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/mateo-khalil/sumate-ya --skill vitest-mateo-khalil

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest addresses the need for fast, integrated unit testing in Vite projects, eliminating slow, brittle test setups and improving developer feedback loops.

Core Features & Use Cases

Jest-compatible API with Vite-native transforms for fast test execution
Native ESM, TypeScript, and JSX support with minimal configuration
Built-in coverage, powerful test filtering, and fixture support for scalable test suites
Use Case: validate UI components, libraries, and tooling in modern frontend stacks

Quick Start

Install Vitest in your project and run tests with the vitest command to start validating your codebase quickly.

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 and ESM?▼

Vitest provides Jest-compatible unit testing for Vite projects by leveraging Vite-native transforms for fast execution. It supports native ESM, TypeScript, and JSX out of the box, enabling reliable test validation with minimal configuration.

Can I use a Jest-compatible API for testing UI components in a Vite stack?▼

Yes, you can use a Jest-compatible API to validate UI components, libraries, and tooling in modern Vite-based frontend stacks. Vitest delivers this familiar interface while utilizing Vite-native transforms to accelerate test execution and improve developer feedback loops.

Does Vitest support built-in coverage and test filtering for scalable test suites?▼

Vitest supports built-in coverage, powerful test filtering, and fixture support for scalable test suites in Vite projects. These features enable comprehensive validation and organized test management for frontend and library projects using TypeScript or ESM.

Why are my Jest unit tests running slow in a Vite frontend project?▼

Jest unit tests run slow in Vite projects because they require separate configuration outside the Vite pipeline. Vitest solves this by delivering fast, Vite-integrated unit tests using native transforms, eliminating slow setups and improving developer feedback loops.

Do I need native ESM support to run unit tests with Vitest?▼

Yes, native ESM support is required, along with TypeScript or JSX usage, to run unit tests with Vitest. This requirement ensures the testing framework integrates natively with modern Vite-based frontend and library workflows.

What is the best way to set up multi-project workflows for Vite unit testing?▼

The best way to set up multi-project workflows for Vite unit testing is using Vitest, which provides built-in multi-project workflow support alongside fixtures and coverage. This enables scalable test suites across various Vite-based frontend and library projects.