typescript - 是否可以扩展 TypeScript 中的内置 Event 类？

Question

代码:

class MyEvent extends Event {
    constructor(name) {
        super(name);
    }
}

var event = new MyEvent("mousemove");

运行时错误:

Uncaught TypeError: Failed to construct 'Event': Please use the 'new' operator, this DOM object constructor cannot be called as a function.

有解决办法吗？

Answer 1

Uncaught TypeError: Failed to construct 'Event': Please use the 'new' operator, this DOM object constructor cannot be called as a function.

问题出在 Event v8 运行时中的定义。它不适合基于 class 的扩展。同样的问题曾经因错误而存在，即以下曾经失败:

class MyError extends Error {
    constructor(message) {
        super(message);
    }
}

const error = new MyError("some message");

所以现在。您不能在 TypeScript(或 ES6 类)中扩展 Event 类。