prettify_util.ts

type User = {
  id: string;
  username: string;
  email: string;
  password: string;
  isActive: boolean;
  roles: ("admin" | "user" | "guest")[];
};

type Profile = {
  userId: string;
  bio?: string;
  avatarUrl?: string;
};

type Session = {
  sessionId: string;
  userId: string;
  expiresAt: Date;
};

type RedactedUser = Omit<User, "password">;

type Combined = RedactedUser & {
  profile?: Omit<Profile, "userId">;
  session?: Session;
  status: "online" | "offline" | "away";
};

// Intermediate type will show nested intersections and unions as-is
type Intermediate = Combined;

// Prettify flattens type display in editors
type Prettify<T> = {
  [K in keyof T]: T[K];
} & {};

type Flattened = Prettify<Intermediate>;

// Example usage
const userWithSession: Flattened = {
  id: "u123",
  username: "alice",
  email: "alice@example.com",
  isActive: true,
  roles: ["admin", "user"],
  profile: {
    bio: "Software engineer",
    avatarUrl: "https://example.com/avatar.png"
  },
  session: {
    sessionId: "s456",
    userId: "u123",
    expiresAt: new Date()
  },
  status: "online"
};