add handler method this scope capability

vue-event-bus.js

/**
 * A Simple EventBus Plugin for Vue
 */
export default {

  $eventBus: null,

  install (Vue) {
    this.$eventBus = new Vue()
  },

  listen (eventClass, handler, scope) {
    if (scope) {
      handler.$scoped = event => handler.call(scope, event)
      this.$eventBus.$on(eventClass.name, handler.$scoped)
    } else {
      this.$eventBus.$on(eventClass.name, handler)
    }
  },

  listenOnce (eventClass, handler, scope) {
    if (scope) {
      handler.$scoped = event => handler.call(scope, event)
      this.$eventBus.$once(eventClass.name, handler.$scoped)
    } else {
      this.$eventBus.$once(eventClass.name, handler)
    }
  },

  remove (eventClass, handler) {
    if (handler) {
      let callback = (handler.$scoped)?handler.$scoped:handler
      this.$eventBus.$off(eventClass.name, callback)
    } else {
      this.$eventBus.$off(eventClass.name)
    }
  },

  removeAll () {
    this.$eventBus.$off()
  },

  publish (event) {
    this.$eventBus.$emit(event.constructor.name, event)
  }

}

I got the purpose of your doing. But, instead of modifying the publish method I would define a constant (somewhere proper) in my application and re-use it:

const APP_START_EVENT = new AppStartEvent()

//...

EventBus.publish(APP_START_EVENT)

Thus, we can keep the benefit of layering and easily intercept event calls. An example use-case would be localization:

export class TerminateResultEvent {
  
  constructor(success, message = ""){
    this.success = success
    this.message = Locale.getMessage(message)
  }

}

EventBus.publish(new TerminateResultEvent(false, "app.error.msg1"))

By the way, I guess you mean the publish method when you write listen. Otherwise, listening an object instance doesn't make sense to me.

Cheers!