CustomButton.vue

<template>
<button @click='increaseUpdateCount'>{{label}}</button>
</template>
<script>
import { EventBus } from './EventBus.js'
export default {
 props: ['label'],
 methods: {
   increaseUpdateCount () {
    EventBus.$emit('my-custom-event', 'hello')
   }
  }
}
</script>