interface Root {
 age: string;
  age: number;
  name: string;
 pets: Array<>;
  pets: Array<{
    age: number;
    name: string;
  }>;
}

1	1		interface Root {
2		-	age: string;
	2	+	age: number;
3	3		name: string;
4		-	pets: Array<>;
	4	+	pets: Array<{
	5	+	age: number;
	6	+	name: string;
	7	+	}>;
5	8		}