vuejs_course/2021-03-27_routing-01-starting-setup/src/main.js

import { createApp } from 'vue';

import App from './App.vue';

const app = createApp(App);

app.mount('#app');

if (module.hot) {
  module.hot.accept(); // already had this init code

  module.hot.addStatusHandler(status => {
    if (status === 'prepare') console.clear();
  });
}