How to introduce the vuejs entry file main.js into App.vue

import Vue from "vue"
import App from "./App"
Vue.config.productionTip = false
new Vue({
    el: "-sharpapp",
    components: { App },
    template: "<App/>",
});
<template>
  <div id="app">
      {{message}}
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      message: "hello world"
    };
  }
};
</script>

Jun.24,2022

import App from './App.vue'
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