EventBus.ts

import * as ko from 'knockout';

export class EventBus {

  private static _instance:EventBus = new EventBus();

  // props for pub-sub
  public myProp:KnockoutObservable<string> = ko.observable('');

  constructor(){
    if(EventBus._instance){
      throw new Error('Cannot instantiate. Use EventBus.getInstance() instead');
    }
    EventBus._instance = this;
  }

  public static getInstance():EventBus{
    return EventBus._instance;
  }
}