Adding babel polyfil

package.json

@@ -10,6 +10,7 @@
     "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
   },
   "devDependencies": {
+    "babel-polyfill": "^6.26.0",
     "bootstrap-sass": "^3.3.7",
     "cross-env": "^5.0.1",
     "eslint": "^4.8.0",

resources/assets/js/app.js

 require('./bootstrap');
 
+import 'babel-polyfill';
 import Vue from 'vue';
 import VueI18n from 'vue-i18n';
 import VueRouter from 'vue-router';