SOURCE

var Main = {
  data() {
      return {
        msg: 'asdsad'
      }
  },
  mounted(){
      console.log('moment', moment)
  }
 
};
var Ctor = Vue.extend(Main);
new Ctor().$mount('#app')

<script src="https://cdn.jsdelivr.net/npm/vue@2.6.12"></script>
<script src="https://unpkg.com/browse/ant-design-vue@1.7.2/dist/antd.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>

<div id="app">
    <template>
        <button>{{msg}}</button>
        <a-button>{{msg}}</a-button>
     </template>
</div>