[ts]声明参考

官网地址

Objects with Properties

Code

let result = myLib.makeGreeting("hello, world");
console.log("The computed greeting is:" + result);

let count = myLib.numberOfGreetings;

Declaration

declare namespace myLib {
    function makeGreeting(s: string): string;
    let numberOfGreetings: number;
}

重载函数

Code

let x: Widget = getWidget(43);
let arr: Widget[] = getWidget("all of them");

Declaration

declare function getWidget(n: number): Widget;
declare function getWidget(s: string): Widget[];

可重复使用的Types (Interfaces)

Code

greet({
    greeting: "hello world",
    duration: 4000
});

Declaration

interface GreetingSettings {
    greeting: string;
    duration?: number;
    color?: string;
}

declare function greet(setting: GreetingSettings): void;

可重复使用的Types (Type Aliases)

Code

function getGreeting() {
    return "howdy";
}

class MyGreeter extends Greeter {}
greet("hello");
greet(getGreeting);
greet(new MyGreeter());

Declaration

type GreetingLike = string | (() => string) | MyGreeter;
declare function greet(g: GreetingLike): void;

Organizing Types

Code

const g = new Greeter("Hello");
g.log({ verbose: true });
g.alert({ modal: false, title: "Current Greeting" });

Declaration

declare namespace GreetingLib {
    interface LogOptions {
        verbose?: boolean;
    }

    interface AlertOptions {
        modal: boolean;
        title?: string;
        color?: string;
    }
}

declare namespace GreetingLib.Options {
    // Refer to via GreetingLib.Options.Log
    interface Log {
        verbose?: boolean;
    }

    interface Alert {
        modal: boolean;
        title?: string;
        color?: string;
    }
}

Classes

Code

const myGreeter = new Greeter("hello, world");
myGreeter.greeting = "howdy";
myGreeter.showGreeting();

class SpecialGreeter extends Greeter {
    constructor() {
        super("Very special greetings");
    }
}

Declaration

declare class Greeter {
    constructor(greeting: string);
    greeting: string;
    showGreeting(): void;
}

全局变量

// const let
declare const foo: number;

全局函数

declare function greet(greeting: string): void;