How does this skill help with Jest migration?

It provides automated codemod commands and detailed manual mapping guides to convert Jest-specific syntax, such as jest.fn() and jest.mock(), into Vitest equivalents like vi.fn() and vi.mock() seamlessly.

Why should I switch from Jest to Vitest using this skill?

Vitest offers 2-10x faster startup times and native TypeScript support. This skill ensures you capture these benefits while maintaining the Jest-compatible API your team is already familiar with.

Does this skill cover complex configurations like monorepos?

Yes, it includes guidance for workspace configuration, path alias resolution, and handling environment-specific setups for React, Vue, and Node.js.

Can I use this for new Vitest projects or only migrations?

While it excels at migrations, it is also a complete guide for new setups, offering best practices for configuration, performance optimization with happy-dom, and visual debugging via Vitest UI.

Vitest Migration & Testing

Name: Vitest Migration & Testing
Author: el-feo

byel-feo

Security & Testing

Streamlines the migration from Jest to Vitest and provides expert guidance for configuring high-performance TypeScript testing environments.

About

This skill provides a comprehensive framework for transitioning from Jest to Vitest with a strong focus on automated migration using codemods. It equips developers with the knowledge to handle configuration setup, resolve API differences such as module mocking and globals, and optimize test performance using modern tools like happy-dom. Whether you are setting up a new project or modernizing an existing test suite, this skill ensures a seamless transition with minimal code changes and significant improvements in test execution speed and developer experience.

Key Features

Optimized configuration for TypeScript and ESM-first architectures
Automated Jest-to-Vitest migration via specialized codemods
Performance tuning strategies using happy-dom and worker pool isolation
0 GitHub stars
Detailed API mapping for mocking, timers, and global variables
Visual debugging guidance using Vitest UI mode

Use Cases

Migrating legacy Jest suites to Vitest with minimal manual intervention
Setting up high-performance unit testing for Vite-based TypeScript projects
Troubleshooting complex mocking behaviors and path alias resolution in tests

About

Key Features

Optimized configuration for TypeScript and ESM-first architectures
Automated Jest-to-Vitest migration via specialized codemods
Performance tuning strategies using happy-dom and worker pool isolation
0 GitHub stars
Detailed API mapping for mocking, timers, and global variables
Visual debugging guidance using Vitest UI mode

Use Cases

Migrating legacy Jest suites to Vitest with minimal manual intervention
Setting up high-performance unit testing for Vite-based TypeScript projects
Troubleshooting complex mocking behaviors and path alias resolution in tests