Extracted dependencies into `_deps` file

src/js/_deps.js

+'use strict';
+
+module.exports = {
+	Vue: require('vue/dist/vue.runtime.common')
+};

src/js/app.js

 'use strict';
 
-var Vue = require('vue/dist/vue.common');
+var Vue = require('./_deps').Vue;
 
 var app = new Vue({
 	el: '#app',

src/js/app.router.js

 'use strict';
 
-var Vue       = require('vue/dist/vue.common');
+var Vue       = require('./_deps').Vue;
 var VueRouter = require('vue-router');
 
 Vue.use(VueRouter);

src/js/app.store.js

 'use strict';
 
-var Vue  = require('vue/dist/vue.common');
+var Vue  = require('./_deps').Vue;
 var Vuex = require('vuex');
 
 Vue.use(Vuex);