vitest

Name: vitest
Availability: InStock
Author: Ravn

Run Vite-powered unit and integration tests with a Jest-compatible API.

3|Updated Apr 3, 2026

Search Tags:#typescript #vitest #testing #javascript #mocking #snapshots

Ready to run

npx skills add https://github.com/ravnhq/typescript-blueprint --skill vitest-ravnhq

💬 Prompt for ChatGPT / Claude Chat▼

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

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest accelerates JavaScript/TypeScript testing by providing a fast, Vite-native runner with a Jest-compatible API, enabling quick feedback in development and CI.

Core Features & Use Cases

Fast, esbuild-powered test runs with native ESM and TypeScript support.
Jest-compatible APIs (describe, test, expect) with Vite's module graph and HMR-like updates.
Snapshot, mocking, and fixture support for reliable tests across monorepos.
Use Case: streamline unit and integration tests in API, web, and mobile projects using a unified toolchain.

Quick Start

Install Vitest, configure a vitest.config.ts, and start running tests in watch or CI.

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 TypeScript project using Vite?▼

To run unit tests for a TypeScript project using Vite, you can use a Vite-native runner with a Jest-compatible API. It leverages esbuild for fast execution and supports native ESM, enabling quick feedback during development and CI.

Does Vitest work with existing Jest APIs and configurations?▼

Yes, Vitest works with existing Jest APIs by providing a Jest-compatible interface using describe, test, and expect. This allows you to migrate your testing setup to a Vite-powered runner without rewriting your test suites.

Can I use mocking and snapshots for integration testing in a monorepo?▼

Yes, you can use mocking and snapshots for integration testing in a monorepo. The testing framework supports deterministic tests, fixtures, and snapshot capabilities to ensure reliable verification across complex project structures.

What is the best way to speed up JavaScript testing in continuous integration?▼

The best way to speed up JavaScript testing in continuous integration is using an esbuild-powered test runner. It utilizes Vite's module graph and HMR-like updates to provide fast test execution and quick feedback loops.

How do I configure a testing environment for API, web, and mobile projects?▼

You configure a testing environment for API, web, and mobile projects by setting up a unified toolchain. A single configuration file defines the runner, CLI, and plugin surfaces to verify tests consistently across different platforms.