从 Person 接口声明一个 kindPerson 对象，其中所有属性都是必需的。
interface Person { age: number; firstName: string; lastName?: string; } let @(10): @(16) = { age: 1800, firstName: "Santa", lastName: "Claus" };
interface Person { age: number; firstName: string; lastName?: string; } let kindPerson: Required<Person> = { age: 1800, firstName: "Santa", lastName: "Claus" };