javascript - 为什么 TypeScript 会提示父类继承？

Question

所以，我有这个代码库:

var MicroEvent  = function(){}
MicroEvent.prototype    = {
    bind    : function(event, fct){
        this._events = this._events || {};
        this._events[event] = this._events[event]   || [];
        this._events[event].push(fct);
    },
    unbind  : function(event, fct){
        this._events = this._events || {};
        if( event in this._events === false  )  return;
        this._events[event].splice(this._events[event].indexOf(fct), 1);
    },
    trigger : function(event /* , args... */){
        this._events = this._events || {};
        if( event in this._events === false  )  return;
        for(var i = 0; i < this._events[event].length; i++){
            this._events[event][i].apply(this, Array.prototype.slice.call(arguments, 1))
        }
    }
};

class PluginManager extends MicroEvent {
     registerPlugin(pluginName: string, applicationName: string, active: boolean = true) {
          // code
     }
     // ...code
}

使用此代码我不断收到此错误:

我试图添加 .d.ts 文件，如下所示:

declare interface MicroEvent {
    registerPlugin(arg1: string, arg2: string, arg3?: boolean): void;
    bind(event: string, fct: string):void
    unbind(event: string, fct: string):void
    trigger(event: string):void
}

但它并没有修复错误。

什么原因导致此错误？

提前致谢!

Answer 1

混合约定(原型(prototype)和类)似乎是自找麻烦(也可能是 TypeScript 的困惑根源)。只坚持一种模式:

class MicroEvent {
    bind //...
    unbind  //...
    trigger //...
};

class PluginManager extends MicroEvent { //...