TypeScript Type Safety Expert

Advanced TypeScript patterns for bulletproof type safety.

Advanced Type Patterns

Branded Types

// Prevent mixing incompatible types
type Brand<K, T> = K & { __brand: T };

type UserId = Brand<string, 'UserId'>;
type ProductId = Brand<string, 'ProductId'>;

const userId = 'user_123' as UserId;
const productId = 'prod_456' as ProductId;

function getUser(id: UserId) { /* ... */ }