First you should add emoji resource to your directory . and define a path to get it.
import Vue from 'vue'
import VueEmoji from 'vue-emoji'
Vue.use(VueEmoji, { path: '../emoji/' })
<script src="vue.js"></script>
<script src="vue-emoji.js"></script>
Vue.use(VueEmoji, { path: '../emoji/' })
then in html
<div>{{{ msg | emoji }}}</div>