MyViewModelWithEventBus.ts

import * as ko from 'knockout';
// ...imports omitted...
import {EventBus} from './EventBus';

export default class CoffeeRoundViewModel {

  // ...other vars omitted...

  private eventBus = EventBus.getInstance();

  constructor() {
    var self = this;

    self.eventBus.myProp.subscribe(
      function(){
        // this is called whenever the value changes
        console.log('Subscribe: ' + self.eventBus.myProp());
      });
  }
}