nested-forms/libs/contact/src/lib/contact-model.ts

export interface Name {
  firstName: string;
  lastName: string;
  middleName: string;
  prefix: string;
  suffix: string;
}

export interface Address {
  line1: string;
  line2: string;
  city: string;
  state: string;
  postalCode: string;
}

export interface Contact {
  name: Name;
  addresses: Address[];
}