在使用 TypeScript 的绑定函数中未正确识别“thisArg"上下文

问题描述

使用下面的代码，TypeScript 将无法识别 thisArg 的上下文(应该是 a 并且应该有 saySomething() 方法. 是否有另一种方法可以为 TypeScript 提供 thisArg 的上下文?

With the below code, TypeScript won't recognize the context of thisArg (which should be a and should have saySomething() method. is there another way to give context of thisArg for TypeScript?

代码:

class A {
    saySomething() {
        console.log('Hello!');
    }
}

class B {
    constructor(a: A) {
        const boundSaySomething = this.saySomethingMyself.bind(a);
        boundSaySomething();
    }

    saySomethingMyself() {
        this.saySomething();
    }
}

const test = new B(new A());

控制台正确记录Hello，但类型检查显示

the console correctly logs Hello, but the the type checking is saying

属性saySomething"在类型B"上不存在.(2339)

推荐答案

这个答案解决了我的问题.

基本上，我必须

通过添加它(及其类型)在任何函数中更改 this 的上下文作为函数的第一个参数.

就我而言，我不得不将 saySomethingMyself 方法从 saySomethingMyself() 更改为 saySomethingMyself(this: A).

In my case, I had to change saySomethingMyself method from saySomethingMyself() to saySomethingMyself(this: A).

完整的更新代码:

class A {
    saySomething() {
        console.log('Hello!');
    }
}

class B {
    constructor(a: A) {
        const boundSaySomething = this.saySomethingMyself.bind(a);
        boundSaySomething();
    }

    saySomethingMyself(this: A) {
        (this).saySomething();
    }
}

const test = new B(new A());

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