Vue data, computed, methods の短縮記述

<template>
  <div>
    <div>{{message}}</div>
    <div>{{customMessage}}</div>
    <button @click="updateMessage">click me</button>
  </div>
</template>

<script>

export default {
  name: 'App',
  components: {},
  data(){
    return {
      message: 'hahaha',
    }
  },
  computed: {
    customMessage(){
      return this.message + ' custom'
    }
  },
  methods: {
    updateMessage(){
      this.message = 'bububu'
    },
  }
}
</script>

<style>
</style>