webpack.config.js

# npm install -g webpack

//Javascript module loader
var debug = process.env.NODE_ENV !== "production"; 
var webpack = require('webpack');

module.exports = {
  context: __dirname, //source code directory
  devtool: debug ? "inline-sourcemap" : null, //inline-sourcemap only in non-production
  entry: "./js/scripts.js", //entry point
  output: {
    path: __dirname + "/js",
    filename: "scripts.min.js" 
  },
  plugins: debug ? [] : [
    new webpack.optimize.DedupePlugin(),
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({ mangle: false, sourcemap: false }),
  ],
};