webpack.config.js

var webpack = require('webpack');

var PROD = (process.env.NODE_ENV === 'production')

module.exports = {

    context: __dirname + "/src",
    entry: "./script",
    output: {
        path: __dirname + "/build",
        filename: PROD ? 'bundle.min.js' : 'bundle.js'
    },
    module: {
        loaders: [
            {
                test: /.js/,
                loaders: ['babel?cacheDirectory'],
            },
            {
                test: /\.json$/,
                loader: 'json'
            }
        ]
    },
    plugins: PROD ? [
        new webpack.optimize.UglifyJsPlugin({
            compress: {
              warnings: false,
              screw_ie8: true
            },
            comments: false
        }),
	     new webpack.DefinePlugin({
	          "process.env": {
		            NODE_ENV: JSON.stringify("production")
	             }
       })
    ] : [
	new webpack.DefinePlugin({
	    "process.env": {
		NODE_ENV: JSON.stringify("develop")
	    }
	})
    ]
};