与@RyanCavanaugh讨论了他的个人开发经验。
当我们不小心使用对象的内部属性时，通常会收到错误消息。同样，我们可能会忘记实际获取对象的内部属性。

// @strict: true

interface Person {
  residence: House;
}

interface House {
  isHouseOfPain: boolean;
}

declare let home: House;
declare let person: Person;

   home = person.residence.isHouseOfPain;
// ~~~~
// error: Type 'boolean' is not assignable to type 'House'.

   home = person;
// ~~~~
// error: Property 'isHouseOfPain' is missing in type 'Person' but required in type 'House'.
//   related: 'isHouseOfPain' is declared here.

如果我们能提示用户“嘿，你可能在对象中点得太远了”或者“嘿，你是想获取 residence 属性吗？”那就太好了。