vitest

Name: vitest
Availability: InStock
Author: Jannael

Run Vitest unit tests with Vite-native ESM and TypeScript support.

16|1|Updated Mar 5, 2026

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

Ready to run

npx skills add https://github.com/Jannael/Glinter --skill vitest-jannael

💬 Prompt for ChatGPT / Claude Chat▼

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

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest provides a fast, native unit testing framework for JavaScript and TypeScript that integrates with Vite, delivering Jest-compatible APIs for a smoother testing workflow and faster feedback loops.

Core Features & Use Cases

Vite-native testing pipeline for rapid test updates.
Jest-compatible API with native ESM, TypeScript, and JSX support.
Smart watch mode and selective reruns to speed up feedback.
Built-in code coverage via V8 or Istanbul and snapshot testing.
Lightweight, parallel test execution with reliable configuration.

Quick Start

Run Vitest in your project to start fast feedback from your tests.

Frequently Asked Questions about vitest

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

FAQPage Schema

How do I speed up TypeScript unit testing with native ESM support?▼

Vitest enables Jest-compatible unit testing with native ESM and TypeScript support, powered by Vite's transform pipeline. It delivers rapid feedback loops using smart watch mode and multi-threaded workers for efficient test execution.

Can I migrate my existing Jest configurations to Vitest easily?▼

Yes, you can migrate to Vitest easily because it is largely compatible with most Jest configurations and APIs. It provides a familiar testing environment while leveraging Vite's pipeline to execute tests faster.

What is the best way to run watch mode for JavaScript unit tests?▼

The best way to run watch mode is using Vitest, which offers smart watch mode and selective reruns to speed up feedback. It instantly reruns only relevant tests upon file changes, powered by Vite's native pipeline.

Does Vite integration help with built-in code coverage and snapshot testing?▼

Yes, Vite integration helps deliver built-in code coverage via V8 or Istanbul alongside native snapshot testing. Vitest provides these features natively, ensuring accurate code coverage metrics and reliable output validation.

How do I set up a Vite project for parallel test execution?▼

To set up parallel test execution, run Vitest in your Vite project to utilize its lightweight, multi-threaded workers. This configuration delivers fast feedback and reliable project-level testing across ESM and TS code.