How to bind the click event when the vue packaged component is called

We will encapsulate many common components during development, so how to bind a click event when encapsulating a component?
1.child component

<template>
    <div class="child"  @click="$emit'childClick',123) />
   //说明：第一个参数：childClick ，是事件名，在调用的时候需要用到，第二个参数123，是你在调用的时候传给父组件的值
</template>

2.parent component

<template>
   <Child @childClick ="childClick ($event)"/>
</template>

<script>
    exxport defaut{
      component:{
         Child:()=>import('./child')
      },
      methods:{
         childClick(v){
           console.log(v) //123
         }
   }
</script>