Union ও Intersection Types

type ID = string | number;

function formatId(id: ID): string {
  return "ID: " + id;
}

console.log(formatId("a-1"));
console.log(formatId(42));

type PaymentStatus = "pending" | "paid" | "failed";
type Result = "success" | "error";

function show(status: PaymentStatus): void {
  console.log(status);
}

show("paid");
// show("done");    // ❌ অনুমোদিত নয়

type User = {
  name: string;
};

type Admin = {
  role: string;
};

type AdminUser = User & Admin;

const boss: AdminUser = {
  name: "রহিম",
  role: "admin",
};

// boss-এ name ও role দুইটিই বাধ্যতামূলক

type BaseUser = {
  id: number;
  name: string;
};

type Premium = {
  premium: true;
  expiresAt: Date;
};

type PremiumUser = BaseUser & Premium;

const member: PremiumUser = {
  id: 1,
  name: "সুমন",
  premium: true,
  expiresAt: new Date("2026-12-31"),
};