What version of Vitest does this skill support?

This skill is specifically designed for Vitest 3.0 and newer, covering features released through early 2025.

How does this skill handle Windows file paths?

It enforces the use of backslashes (\) for all file operations on Windows systems to ensure compatibility with Edit and Write tools.

Can this skill help with Vitest migrations?

Yes, it includes specific patterns and checklists for migrating from Vitest 2.x to 3.x, including breaking changes in the Reporter API and workspace configs.

Does this skill create new documentation files?

No, it follows a 'clean repo' policy, prioritizing updates to existing README.md files rather than generating new markdown files unless specifically requested.

Vitest 3 Master & Best Practices

Name: Vitest 3 Master & Best Practices
Author: JosiahSiegel

byJosiahSiegel

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Security & Testing

Optimizes test suites with expert guidance on Vitest 3.x features, including the Annotation API, enhanced mocking, and workspace configurations.

This skill equips Claude with specialized knowledge of Vitest 3.0+ to help developers implement modern testing patterns and performance optimizations. It provides actionable guidance for using the new Annotation API for debugging, line-number filtering for rapid TDD, and simplified workspace configurations for complex monorepos. Beyond testing logic, the skill ensures cross-platform reliability by enforcing Windows-specific file path standards and maintains repository cleanliness by adhering to strict documentation and file management guidelines.

Key Features

01Simplified workspace configuration patterns for multi-project repos

027 GitHub stars

03Advanced mocking techniques and strict spy verification

04Windows-specific file path enforcement for tool compatibility

05Annotation API integration for rich test metadata and attachments

06Enhanced browser testing and parallel execution strategies

Use Cases

01Optimizing CI/CD pipelines using custom reporters and workspace isolation

02Debugging complex test failures with metadata-rich annotations

03Migrating existing JavaScript projects from Vitest 2.x to 3.x

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add josiahsiegel/claude-plugin-marketplace vitest-3-features

For use in Claude.ai and ChatGPT

Download Skill