如何在typescript中公开事件，以便ES5代码可以定义处理程序？

import { EventEmitter } from 'events';

class MyEmitter extends EventEmitter {
  // ...
}

class MyEmitter extends EventEmitter {
  // 定义事件
  static readonly MY_EVENT = 'myEvent';

  // 定义处理程序
  onMyEvent(callback: () => void) {
    this.on(MyEmitter.MY_EVENT, callback);
  }

  emitMyEvent() {
    this.emit(MyEmitter.MY_EVENT);
  }
}

var myEmitter = new MyEmitter();

myEmitter.onMyEvent(function() {
  console.log('Event handler called');
});

myEmitter.emitMyEvent();