Enum mendefinisikan sekumpulan konstanta bernama:

Numeric enum:

enum Direction { Up, Down, Left, Right }
// Up = 0, Down = 1, Left = 2, Right = 3

let dir: Direction = Direction.Up;

String enum:

enum Color {
  Red = "RED",
  Green = "GREEN",
  Blue = "BLUE"
}

Const enum — dihapus saat kompilasi (inline):

const enum Status {
  Active = "ACTIVE",
  Inactive = "INACTIVE"
}
// Lebih efisien karena tidak menghasilkan object runtime

Tips: Di TypeScript modern, banyak developer lebih memilih union literal types daripada enum:

type Direction = "up" | "down" | "left" | "right";
// Lebih sederhana dan tree-shakeable