Worked on enhancing the tanstack/router repository by delivering flexible server function return types, allowing server functions to return either a Response or a string. This involved updating TypeScript type definitions to support distributive union return types and adding comprehensive tests to validate the new semantics. The focus was on improving type safety and API flexibility for server-driven workflows, ensuring that developers can handle multiple response types with confidence. No major bugs were addressed during this period, as the primary effort centered on robust typing features. The work demonstrated strong skills in TypeScript, type safety, and testing within a modern codebase.