类型兼容性

TypeScript 中的类型兼容性基于结构子类型。结构类型是一种仅基于其成员关联类型的方法。这与名义打字相反。考虑以下代码:

interface Pet {
  name: string;
}

class Dog {
  name: string;
}

let pet: Pet;
// OK, because of structural typing
pet = new Dog();

在 C# 或 Java 等名义类型语言中,等效代码将是错误的,因为 Dog 类没有明确将自己描述为 Pet 接口的实现者。

TypeScript 的结构化类型系统是根据 JavaScript 代码的典型编写方式设计的。因为 JavaScript 广泛使用匿名对象,如函数表达式和对象字面量,所以用结构化类型系统而不是名义上的类型系统来表示 JavaScript 库中发现的关系类型要自然得多。

关于健全性的说明

TypeScript 的类型系统允许某些在编译时不知道的操作是安全的。当一个类型系统有这个属性时,就说它不是"sound"。仔细考虑了 TypeScript 允许不合理行为的地方,并且在整个文档中,我们将解释这些情况发生的位置以及它们背后的激励场景。

开始

TypeScript 结构类型系统的基本规则是,如果 y 至少具有与 x 相同的成员,则 xy 兼容。例如,考虑以下代码,其中涉及一个名为 Pet 的接口,该接口具有 name 属性:

interface Pet {
  name: string;
}

let pet: Pet;
// dog's inferred type is { name: string; owner: string; }
let dog = { name: "Lassie", owner: "Rudd Weatherwax" };
pet = dog;

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interface Pet {
  name: string;
}

let dog = { name: "Lassie", owner: "Rudd Weatherwax" };

function greet(pet: Pet) {
  console.log("Hello, " + pet.name);
}
greet(dog); // OK

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比较两个函数

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let x = (a: number) => 0;
let y = (b: number, s: string) => 0;

y = x; // OK
x = y; // Error

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let items = [1, 2, 3];

// Don't force these extra parameters
items.forEach((item, index, array) => console.log(item));

// Should be OK!
items.forEach((item) => console.log(item));

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let x = () => ({ name: "Alice" });
let y = () => ({ name: "Alice", location: "Seattle" });

x = y; // OK
y = x; // Error, because x() lacks a location property

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函数参数双方差

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enum EventType {
  Mouse,
  Keyboard,
}

interface Event {
  timestamp: number;
}
interface MyMouseEvent extends Event {
  x: number;
  y: number;
}
interface MyKeyEvent extends Event {
  keyCode: number;
}

function listenEvent(eventType: EventType, handler: (n: Event) => void) {
  /* ... */
}

// Unsound, but useful and common
listenEvent(EventType.Mouse, (e: MyMouseEvent) => console.log(e.x + "," + e.y));

// Undesirable alternatives in presence of soundness
listenEvent(EventType.Mouse, (e: Event) =>
  console.log((e as MyMouseEvent).x + "," + (e as MyMouseEvent).y)
);
listenEvent(EventType.Mouse, ((e: MyMouseEvent) =>
  console.log(e.x + "," + e.y)) as (e: Event) => void);

// Still disallowed (clear error). Type safety enforced for wholly incompatible types
listenEvent(EventType.Mouse, (e: number) => console.log(e));

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可选参数和剩余参数

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function invokeLater(args: any[], callback: (...args: any[]) => void) {
  /* ... Invoke callback with 'args' ... */
}

// Unsound - invokeLater "might" provide any number of arguments
invokeLater([1, 2], (x, y) => console.log(x + ", " + y));

// Confusing (x and y are actually required) and undiscoverable
invokeLater([1, 2], (x?, y?) => console.log(x + ", " + y));

具有重载的函数

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枚举

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enum Status {
  Ready,
  Waiting,
}
enum Color {
  Red,
  Blue,
  Green,
}

let status = Status.Ready;
status = Color.Green; // Error

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class Animal {
  feet: number;
  constructor(name: string, numFeet: number) {}
}

class Size {
  feet: number;
  constructor(numFeet: number) {}
}

let a: Animal;
let s: Size;

a = s; // OK
s = a; // OK

类中的私有成员和受保护成员

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泛型

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interface Empty<T> {}
let x: Empty<number>;
let y: Empty<string>;

x = y; // OK, because y matches structure of x

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interface NotEmpty<T> {
  data: T;
}
let x: NotEmpty<number>;
let y: NotEmpty<string>;

x = y; // Error, because x and y are not compatible

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5eUJ1sMkUpgXgDNmQmZTAQ==

let identity = function <T>(x: T): T {
  // ...
};

let reverse = function <U>(y: U): U {
  // ...
};

identity = reverse; // OK, because (x: any) => any matches (y: any) => any

高级主题

子类型与赋值

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Any、unknown、object、void、undefined、null 和 never 可分配性

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anyunknownobjectvoidundefinednullnever

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kZd7xZem1h6JctBJ0SsBuA==

kZd7xZem1h6JctBJ0SsBuA==

kZd7xZem1h6JctBJ0SsBuA==

kZd7xZem1h6JctBJ0SsBuA==

/+149kECQFjsrkxG/pzjEg==

ecnQgjkR5bnP6Rc4XwEl5g==

kZd7xZem1h6JctBJ0SsBuA==

/+149kECQFjsrkxG/pzjEg==

/+149kECQFjsrkxG/pzjEg==

/+149kECQFjsrkxG/pzjEg==

/+149kECQFjsrkxG/pzjEg==

/+149kECQFjsrkxG/pzjEg==

0paKRKGzwL3rprEnZfkkgw==

kZd7xZem1h6JctBJ0SsBuA==

kZd7xZem1h6JctBJ0SsBuA==

/+149kECQFjsrkxG/pzjEg==

/+149kECQFjsrkxG/pzjEg==

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