Type Alias Brand<K, T>

Brand: K & { __brand: T }

Branded type for compile-time type safety. Prevents mixing of different ID types at compile time.

Type Parameters

K
The base type (e.g., string, number)
T
The brand identifier (e.g., 'MEPID', 'SessionID')

Example

type UserID = Brand<number, 'UserID'>;
type ProductID = Brand<number, 'ProductID'>;

const userId: UserID = 123 as UserID;
const productId: ProductID = 456 as ProductID;

// This will cause a compile-time error:
// userId = productId; // Error: Type 'ProductID' is not assignable to type 'UserID'