Advanced TypeScript Patterns Every Developer Should Know

# Advanced TypeScript Patterns

TypeScript goes far beyond basic type annotations. Master these advanced patterns to write more expressive and type-safe code.

Conditional Types

type ApiResponse<T> = T extends string
  ? { message: T }
  : T extends object
  ? { data: T }
  : never;

Mapped Types with Key Remapping

type Getters<T> = {
  [K in keyof T as `get${Capitalize<string & K>}`]: () => T[K];
};

Template Literal Types

Create powerful string-based types that catch errors at compile time. Combined with conditional types, they enable incredible type safety for routing, API calls, and more.

Key Takeaways

- Use conditional types for flexible, context-aware types - Mapped types with key remapping create powerful API surfaces - Template literal types enable compile-time string validation