index.js

/******/ (function(modules) { // webpackBootstrap
/******/ 	// The module cache
/******/ 	var installedModules = {};

/******/ 	// The require function
/******/ 	function __webpack_require__(moduleId) {

/******/ 		// Check if module is in cache
/******/ 		if(installedModules[moduleId])
/******/ 			return installedModules[moduleId].exports;

/******/ 		// Create a new module (and put it into the cache)
/******/ 		var module = installedModules[moduleId] = {
/******/ 			exports: {},
/******/ 			id: moduleId,
/******/ 			loaded: false
/******/ 		};

/******/ 		// Execute the module function
/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);

/******/ 		// Flag the module as loaded
/******/ 		module.loaded = true;

/******/ 		// Return the exports of the module
/******/ 		return module.exports;
/******/ 	}


/******/ 	// expose the modules object (__webpack_modules__)
/******/ 	__webpack_require__.m = modules;

/******/ 	// expose the module cache
/******/ 	__webpack_require__.c = installedModules;

/******/ 	// __webpack_public_path__
/******/ 	__webpack_require__.p = "";

/******/ 	// Load entry module and return exports
/******/ 	return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ function(module, exports) {

	"use strict";

	exports.install = function (Vue, options) {

	  // declare global Vue.cordova object
	  Vue.cordova = Vue.cordova || {};

	  // Cordova events wrapper
	  Vue.cordova.on = function (eventName, cb) {
	    document.addEventListener(eventName, cb, false);
	  };

	};

/***/ }
/******/ ]);

src_index.js

exports.install = (Vue, options) => {

  // declare global Vue.cordova object
  Vue.cordova = Vue.cordova || {}

  // Cordova events wrapper
  Vue.cordova.on = (eventName, cb) => {
    document.addEventListener(eventName, cb, false)
  }
  
}

webpack.config.js

var webpack = require('webpack');

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'index.js'
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        loader: 'babel',
        query: {
          presets: ['es2015']
        }
      }
    ]
  },
  resolve: {
    extensions: ['', '.js']
  }
};