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vitest

Run Vitest unit tests for Vite-based projects with TypeScript, JSX, and ESM.

8|Updated Jan 31, 2026
Search Tags:#vitest#TypeScript#unit-testing#Vite#ESM#Jest-compatible#watch-mode
One-click install
npx skills add https://github.com/alexanderop/nuxt-sync-engine --skill vitest-alexanderop
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/alexanderop/nuxt-sync-engine/tree/main/.claude/skills/vitest
Command: npx skills add https://github.com/alexanderop/nuxt-sync-engine --skill vitest-alexanderop

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides fast, modern unit testing for Vite-based projects, enabling a streamlined development workflow with quick feedback and easy integration into your build system.

Core Features & Use Cases

  • Vite-native test runner with fast hot updates
  • Jest-compatible API with native ESM, TypeScript, and JSX support
  • Built-in snapshot testing, mocking utilities, and test coverage
  • Seamless integration with vitest.config.ts and multi-project setups to scale tests

Quick Start

Install vitest in your project with npm i -D vitest, configure a vitest.config.ts using defineConfig from vitest/config, and run tests with npx vitest or via npm scripts like "test". You can also start in watch mode for rapid feedback.

Frequently Asked Questions about vitest

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

FAQPage Schema
How do I set up unit testing for a Vite project with TypeScript and ESM?▼

Unit testing for a Vite project is set up by installing vitest, defining a vitest.config.ts file, and running tests via npx vitest. Vitest provides native ESM, TypeScript, and JSX support without extra build configuration.

What is the best way to get rapid feedback during unit test development?▼

The best way to get rapid feedback is using watch mode. Vitest provides fast hot updates natively through its Vite-powered transformer, re-running only relevant tests instantly when files change.

Can I use a Jest-compatible API for unit testing with native ESM and JSX?▼

Yes, you can use a Jest-compatible API for unit testing with native ESM and JSX. Vitest offers this compatibility out of the box, allowing easy migration while supporting modern JavaScript standards.

Does Vitest support built-in mocking utilities and snapshot testing?▼

Yes, Vitest supports built-in mocking utilities and snapshot testing. It includes these features natively alongside test coverage reporting, enabling comprehensive test suite validation within a single tool.

How do I scale unit tests across multi-project Vite setups?▼

To scale unit tests across multi-project Vite setups, you configure multi-project definitions within vitest.config.ts. Vitest supports this natively, enabling multi-worker execution to run tests concurrently across packages.

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