Worked on the vitest-dev/vitest repository to deliver type-safe test hooks with extended contexts, focusing on enhancing the integration of test.extend within the TestAPI. Leveraging TypeScript and JavaScript, the developer implemented improvements that allow beforeEach, afterEach, beforeAll, and afterAll hooks to recognize and enforce correct typing when custom fixtures are used. The approach included updating documentation and adding comprehensive tests to illustrate usage patterns and edge cases, thereby reducing the risk of runtime errors. This work improved the reliability and developer experience of the testing framework by ensuring type safety and clarity in test hook usage with extended contexts.