TypeScript University

Write types that branch based on other types using extends and infer — the foundation of most advanced utility types.

Transform existing types by iterating over their keys. Build flexible type transformations without repeating yourself.

Master the built-in utility types — Pick, Omit, Partial, Required, ReturnType, and more — with real use cases.

Bridge compile-time and runtime safety with Zod. Parse external data with schemas that mirror your TypeScript types.