What is type-level testing?

Type-level testing uses tools like tsd to assert that your TypeScript types behave correctly at compile-time, which is essential for library authors and complex applications.

Does this skill support both Jest and Vitest?

Yes, the skill provides specific guidance and configurations for both Jest (using ts-jest) and Vitest, including path alias resolution.

Can I use this for integration testing?

Absolutely. It includes patterns for type-safe API and database testing, ensuring request and response objects maintain type integrity throughout the test.

How does this skill improve mocking?

It implements type-safe mocking patterns using utilities like jest.Mocked, ensuring your mocks stay in sync with the actual interfaces and classes they represent.

TypeScript Testing

Name: TypeScript Testing
Author: pluginagentmarketplace

bypluginagentmarketplace

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Security & Testing

Implements comprehensive, type-safe testing suites for TypeScript projects using modern frameworks and best practices.

This skill empowers Claude to architect and implement advanced testing strategies specifically tailored for TypeScript environments. It covers the full spectrum of quality assurance, from configuring test runners like Vitest and Jest with proper type support to performing sophisticated type-level testing using tsd. By utilizing this skill, developers can ensure their test suites are as type-safe as their production code, leveraging typed mocks, builder patterns, and type-safe integration tests to catch regressions and type mismatches early in the development lifecycle.

Key Features

011 GitHub stars

02Integration and E2E testing with request/response typing

03Advanced mocking strategies using jest.Mocked and vi.fn()

04Reusable test data factories and type-safe builder patterns

05Compile-time type testing with tsd and expect-type

06Type-safe configuration for Jest, Vitest, and ts-node

Use Cases

01Refactoring legacy JavaScript tests into a modern, typed testing suite

02Architecting a type-safe testing infrastructure for a new TypeScript project

03Verifying complex generic types and utility types through compile-time assertions

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add pluginagentmarketplace/custom-plugin-typescript testing

For use in Claude.ai and ChatGPT

Download Skill