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vitest

Run Jest-compatible unit tests with Vite and generate coverage.

1|Updated Feb 26, 2026
Search Tags:#vitest#testing#vite#mocking#unit-testing#snapshots#jest-compatible
One-click install
npx skills add https://github.com/programadorisgod/builder-projects --skill vitest-programadorisgod
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/programadorisgod/builder-projects/tree/main/bin/assets/.agents/skills/vitest
Command: npx skills add https://github.com/programadorisgod/builder-projects --skill vitest-programadorisgod

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest reduces the complexity and time of testing by delivering a fast, Jest-compatible unit testing framework built on Vite, with native ESM and TypeScript support.

Core Features & Use Cases

  • Fast test execution with Vite integration, native ESM, and TypeScript support
  • Jest-compatible API for easy migration and existing suites
  • Snapshotting, mocking, and spying utilities for reliable tests
  • Supports multi-threaded workers and built-in coverage for robust CI
  • Use cases include writing unit tests, mocking modules, and configuring coverage for modern front-end apps

Quick Start

Run vitest to execute tests with Jest-compatible API and Vite-powered speed.

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 with Vite?▼

Vitest provides a Jest-compatible API powered by Vite, allowing you to run unit tests using your existing Vite config, transformers, and plugins for fast execution with native ESM support.

Does Vitest support native ESM and TypeScript for frontend component testing?▼

Vitest supports native ESM and TypeScript out of the box for frontend component testing, eliminating the need for external transpilers and leveraging Vite's pipeline for fast execution.

How do I migrate from Jest to a Vite-powered testing workflow?▼

Migrating from Jest to a Vite-powered workflow is straightforward because Vitest offers a Jest-compatible API, allowing existing test suites to run with minimal changes while gaining Vite's speed.

Can I use snapshotting and mocking utilities in modern JavaScript unit tests?▼

Vitest includes built-in snapshotting, mocking, and spying utilities for modern JavaScript and TypeScript projects, ensuring reliable unit tests across frontend components and backend APIs.

What is the best way to generate code coverage for a Vite monorepo?▼

The best way to generate coverage for a Vite monorepo is using Vitest's built-in coverage feature, which supports multi-threaded workers to provide robust code coverage reports in CI environments.

Why are my Jest tests slow when using Vite for development?▼

Jest tests can be slow in Vite projects due to configuration mismatches; Vitest solves this by sharing Vite's transformers and resolvers, delivering fast test execution without duplicate compilation.

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