Can I use this skill with TypeScript projects?

Yes, the skill includes specific patterns and boilerplate for implementing type-safe custom matchers and TypeScript-compatible test configurations.

Does it support complex mocking for modern JavaScript?

Absolutely, it covers advanced mocking techniques for ES6 classes, module factories, and dynamic return values for sophisticated dependency isolation.

How does this help with slow test suites?

It provides configurations for parallel execution, sharding, and caching strategies to significantly reduce test execution time in local and CI/CD environments.

Can I customize code coverage reports?

Yes, the skill provides templates for setting granular coverage thresholds per directory and implementing custom coverage reporters for external webhooks.

Jest Advanced Mastery

Name: Jest Advanced Mastery
Author: TheBushidoCollective

byTheBushidoCollective

•

Security & Testing

Implements sophisticated testing patterns, custom matchers, and performance optimizations for complex Jest test suites.

The Jest Advanced skill empowers developers to scale their testing infrastructure with high-level features like custom matchers, type-safe assertions, and parameterized test suites. It provides ready-to-use patterns for complex mocking scenarios, advanced coverage configurations, and performance-tuning techniques such as test sharding and parallel execution, ensuring that even the most complex codebases maintain high quality and fast feedback loops within Claude Code.

Key Features

01Performance Optimization (Max Workers, Sharding, and Caching)

0239 GitHub stars

03Custom Matchers (Sync, Async, and TypeScript-ready)

04Sophisticated Mocking for ES6 Classes and Module Factories

05Advanced Coverage Configuration and Custom Reporters

06Parameterized Testing with test.each (Arrays, Objects, and Templates)

Use Cases

01Creating domain-specific testing languages via custom expect matchers.

02Scaling test suites for large monorepos with performance bottlenecks.

03Automating repetitive test scenarios using data-driven parameterized tests.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add thebushidocollective/han jest-advanced

For use in Claude.ai and ChatGPT

Download Skill