vitest

Run Vite-powered unit tests for JavaScript and TypeScript projects.

Updated Aug 27, 2026
One-click install
npx skills add https://github.com/shuretokki/void --skill vitest-shuretokki
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vitest
Source: https://github.com/shuretokki/void/tree/main/.agents/skills/vitest
Command: npx skills add https://github.com/shuretokki/void --skill vitest-shuretokki

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Vitest reduces slow, brittle, and hard-to-configure test workflows by providing a Vite-powered test runner that runs tests quickly with native ESM and TypeScript support and a familiar Jest-like API.

Core Features & Use Cases

  • Vite-native performance: Leverages Vite's transform pipeline and plugins for fast test execution and HMR-like updates during development.
  • Jest-compatible API: Provides test, describe, expect, and vi mocking utilities so existing Jest suites can be migrated with minimal changes.
  • TypeScript and ESM first: Supports native ESM, TypeScript, and JSX without additional bundling steps.
  • Mocking, fixtures, and hooks: vi mocking utilities, test.extend fixtures, and lifecycle/around hooks for robust setup and teardown patterns.
  • Coverage, snapshots, and filtering: Built-in coverage (V8 or Istanbul), snapshot testing, test filtering, sharding, and concurrent execution for CI and large monorepos.
  • Use Case: Run unit and integration tests in a Vite-based frontend project, mock network calls, run type-only checks, and collect coverage reports in CI.

Quick Start

Run vitest to execute the project's tests with coverage enabled and use jsdom for browser-like tests.

Frequently Asked Questions about vitest

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

FAQPage Schema
How do I run fast unit tests for a Vite project with native TypeScript support?

You can run fast unit tests for a Vite project using a Vite-powered test runner that provides native ESM and TypeScript support without additional bundling steps. It leverages Vite's transform pipeline for quick execution and HMR-like updates.

Can I migrate my existing Jest test suites to Vite with minimal configuration changes?

Yes, you can migrate existing Jest test suites to Vite using a Jest-compatible API that provides test, describe, expect, and vi mocking utilities, allowing you to transition your tests with minimal changes required.

How do I mock network calls and collect code coverage reports in continuous integration?

You can mock network calls using vi mocking utilities and collect code coverage reports in continuous integration by utilizing built-in V8 or Istanbul coverage providers, snapshot testing, and test sharding for large monorepos.

Does Vite-native testing work with Jest-compatible APIs for TypeScript and ESM projects?

Yes, Vite-native testing works with Jest-compatible APIs for TypeScript and ESM projects by supporting native ESM, TypeScript, and JSX out of the box. It uses multi-threaded workers and smart watch mode for efficient test execution.

What is the best way to execute browser-like tests in a Vite-based frontend application?

The best way to execute browser-like tests in a Vite-based frontend application is to run the Vite-powered test runner configured with jsdom. This allows you to apply unit, integration, and snapshot testing workflows efficiently.

How do I handle setup and teardown patterns in TypeScript testing using fixtures and hooks?

You handle setup and teardown patterns in TypeScript testing by using test.extend fixtures alongside lifecycle and around hooks. These utilities provide robust management for test environments and mocking scenarios.