vitest

Run Jest-compatible unit tests for TypeScript projects with Vite.

1|Updated Jan 31, 2026

Search Tags:#typescript #vitest #testing #mocking #Vite #unit-tests #jest-compatible

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npx skills add https://github.com/lyzno1/flux --skill vitest-lyzno1

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Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/lyzno1/flux/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/lyzno1/flux --skill vitest-lyzno1

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides a fast, Jest-compatible unit testing experience for TypeScript projects built with Vite, enabling rapid feedback and reliable test suites.

Core Features & Use Cases

Jest-compatible API with native ESM, TypeScript, and JSX support
Built-in test runner with Vitest config, project-based tests, and coverage reports
Rich features for mocking, snapshots, fixtures, and concurrent tests

Quick Start

Install Vitest in your project: npm i -D vitest Create a vitest.config.ts or add test settings in vite.config.ts Run tests with: npx vitest --run or npm exec vitest

Frequently Asked Questions about vitest

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I run Jest-compatible unit tests for a TypeScript Vite project?▼

Vitest provides a fast, Jest-compatible unit testing experience for TypeScript projects built with Vite. It offers native ESM, TypeScript, and JSX support, enabling rapid feedback and reliable test suites without complex configurations.

What is the best way to set up mocking and snapshots for frontend unit tests?▼

Vitest includes rich features for mocking, snapshots, and fixtures directly within its test runner. You can leverage these built-in APIs in your Vite, React, and full-stack apps to isolate components and capture UI states effectively.

How do I configure test projects and generate coverage reports with Vitest?▼

You can configure test projects and coverage reports by creating a vitest.config.ts file or adding test settings to your existing vite.config.ts. Run tests using npx vitest --run to execute the config-driven test suites.

Does Vitest work with React and full-stack apps requiring Node.js?▼

Vitest works seamlessly with frontend and full-stack apps using Vite, React, and related tooling. It requires a standard environment with Node.js, npm or yarn, and a typical Vitest setup using config-driven projects and test APIs.

Why should I choose Vitest over other Jest-compatible testing tools?▼

Vitest is designed specifically for Vite-powered TypeScript projects, offering native ESM and JSX support out of the box. It delivers faster feedback loops compared to traditional Jest setups by reusing your existing Vite configuration pipeline.