vitest

Run fast unit tests for Vite-based projects with TypeScript and ESM.

1|Updated Apr 4, 2023
One-click install
npx skills add https://github.com/ElderEvil/falloutProject --skill vitest-elderevil
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/ElderEvil/falloutProject/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/ElderEvil/falloutProject --skill vitest-elderevil

SYSTEM DOCUMENTATION & REQUIREMENTS

## What problem does it solve? Vitest is a fast, Jest-compatible unit testing framework designed for modern Vite-based projects, enabling rapid feedback during development and CI.

## Core Features & Use Cases

  • Fast unit tests with native ESM and TypeScript support
  • Seamless integration with Vite for module transforms and hot updates
  • Coverage, snapshots, mocks, and fixtures for reliable test suites
  • Use case: validate UI components, utilities, and APIs with quick iteration

### Quick Start

  1. Install: npm i -D vitest
  2. Configure a vitest.config.ts, then run tests with npx vitest
  3. Start writing tests in .test.ts or .test.tsx files.

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 with TypeScript and ESM?▼

You can run unit tests for a Vite project by installing Vitest, configuring a vitest.config.ts file, and executing npx vitest to natively process TypeScript, JSX, and ESM code.

What is the best way to set up fast unit testing for frontend UI components?▼

The best way to set up fast unit testing for frontend components is using Vitest, a Jest-compatible framework that integrates directly with Vite for rapid module transforms and hot updates.

Does Vitest work with Jest-compatible APIs and configurations?▼

Yes, Vitest works as a Jest-compatible testing framework, allowing you to utilize familiar APIs for mocks, fixtures, coverage, and snapshots while executing tests natively via Vite.

Can I use native ESM and JSX in my test files without complex configuration?▼

You can execute native ESM and JSX test files with zero or minimal configuration using Vitest, leveraging Vite's module transform pipeline to handle modern syntax automatically.

How do I filter specific tests and generate coverage reports in a Vite environment?▼

You can filter specific tests and generate coverage reports in a Vite environment by passing optional CLI options to the npx vitest command within your Node.js setup.

Do I need a specific Node.js environment to execute Vite-based test suites?▼

Yes, you need a Node.js environment along with npm or pnpm to install Vitest and execute your test suites, ensuring the runtime supports your project's Vite-based dependencies.