exportNameSpaces.ts

namespace Vehicle {
  export class Bike {
    user: User;
    constructor(public inputUser: User) {
      this.user = inputUser;
    }
    getName() {
      return this.user.name;
    }
  }
}

const user: User = {
  name: 'John Doe',
  role: Role.OWNER
}

const bike = new Vehicle.Bike(user);

// we can also export the namespace itself.