Container.vue

/*
In this scenario you could just use `vm.$emit` to communicate to `Container` from `CustomButton.
In reality, this pattern will shine when your component is nested inside some more components and
you can't really emit event to the `Container` quite easily.
*/
<template>
<custom-button label='Click me and the I will update the container state' />
</template>

<script>
import { EventBus } from "./EventBus.js"
import CustomButton from "./CustomButton.vue"
export default {
 data () {
  return { buttonClickCount: 0 }
 },
 created () {
  EventBus.$on('my-custom-event', (params) => {
   // you can submit data via params when emitting event.
   console.log(params) 
   this.buttonClickCount++ 
   }
 },
 components: {
  'custom-button': CustomButton
 }
}
</script>