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.

About

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

1 GitHub stars
Integration and E2E testing with request/response typing
Advanced mocking strategies using jest.Mocked and vi.fn()
Reusable test data factories and type-safe builder patterns
Compile-time type testing with tsd and expect-type
Type-safe configuration for Jest, Vitest, and ts-node

Use Cases

Refactoring legacy JavaScript tests into a modern, typed testing suite
Architecting a type-safe testing infrastructure for a new TypeScript project
Verifying complex generic types and utility types through compile-time assertions

About

Key Features

1 GitHub stars
Integration and E2E testing with request/response typing
Advanced mocking strategies using jest.Mocked and vi.fn()
Reusable test data factories and type-safe builder patterns
Compile-time type testing with tsd and expect-type
Type-safe configuration for Jest, Vitest, and ts-node

Use Cases

Refactoring legacy JavaScript tests into a modern, typed testing suite
Architecting a type-safe testing infrastructure for a new TypeScript project
Verifying complex generic types and utility types through compile-time assertions