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You are using es6 modules in your project. And to use any module inside another modules you need to first import it.
Add this line on top of your ./nqt.js
import Vue from 'vue';
Now if you want the vm defined in ./nqt.js
to be used inside other modules, you need to export it here like this.
var vm = new Vue();
export default vm;
And then import it inside ./main.js
import vm from `./nqt.js`
In order to get how it works take a look at http://2ality.com/2014/09/es6-modules-final.html
Source:stackexchange.com