Gennadiy Balachkov

import Vue from 'vue'
// В Example.vue есть <template><div>TEST</div></template>
import Example from './components/Example.vue'

new Vue({
    el: '#example',
    template: '<Example/>',
    components: {Example}
});

import Vue from 'vue'
import App from './App.vue'
import Other from './Other.vue'

new Vue({
  el: '#app',
  template: '<App/><Other/>',
  components: {
    App: App,
    Other: Other
  }
})

<template>
  <div id="app">
    Hello
  </div>
</template>