vitest

Run Jest-compatible unit tests for Vite projects with watch mode and selective execution.

Updated Apr 2, 2026

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

Ready to run

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

💬 Prompt for ChatGPT / Claude Chat▼

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

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides a fast, Jest-compatible unit testing framework tailored for Vite projects, enabling rapid feedback during development.

Core Features & Use Cases

Jest-compatible API: Drop-in test API that works with existing test suites.
Vite-native Performance: Uses Vite's transformation pipeline for blazing-fast test updates.
Snapshotting, Mocking, and Coverage: Built-in features for assertions, mocks, and code coverage in a single tool.

Quick Start

Run vitest in your project to execute tests and receive instant feedback during development.

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 fast, Jest-compatible unit tests for Vite projects by utilizing Vite's transformation pipeline. It offers native ESM, TypeScript, and JSX support out of the box, enabling rapid feedback during development.

Can I use a Jest-compatible API for snapshotting and mocking in Vite?▼

Yes, Vitest provides a drop-in Jest-compatible API that works with existing test suites. It includes built-in snapshotting and mocking tools, allowing you to handle assertions and mocks seamlessly within your Vite-based frontend libraries and applications.

What is the best way to get rapid feedback on code changes during frontend testing?▼

Vitest is designed for rapid feedback on code changes, featuring watch mode and selective test runs. By using Vite's native transformation pipeline, it executes tests in parallel and delivers blazing-fast updates for frontend libraries and applications.

Does Vitest provide built-in code coverage for TypeScript unit tests?▼

Yes, Vitest includes built-in code coverage for TypeScript unit tests. It combines snapshotting, mocking, and coverage reporting in a single tool while executing tests in parallel for fast, Jest-compatible results in Vite projects.

Why use Vitest over other unit testing frameworks for ESM-based applications?▼

Vitest uses Vite's transformation pipeline to deliver blazing-fast test updates and implements native ESM support. Unlike other frameworks, it provides a Jest-compatible API with built-in mocking, snapshotting, and parallel execution tailored specifically for Vite projects.