Typescript Advanced Types

If you're building type-safe libraries, complex generics, or migrating a JavaScript codebase to TypeScript, this gives you structured guidance on the advanced type system. It covers conditional types, mapped types, template literals, and utility types with a focus on practical application rather than academic explanation. The skill includes an implementation playbook with concrete patterns, which is helpful since advanced types can get abstract quickly. Best for scenarios where you need proper type inference or are designing reusable components where getting the types wrong means runtime surprises. Not much value if you're just adding basic type annotations to existing code.