webpack.config.client.production.js

const path = require("path");
const webpack = require("webpack");

module.exports = {
    entry: {
        app: path.join(__dirname, "client/app.jsx") //Use this to add more builds. Different modules don't have to be together on a single file.
    },
    output: {
        path    : path.join(__dirname, "client/build/"),
        filename: "[name].bundle.js", //this is the default name, so you can skip it
        //at this directory our bundle file will be available
    },
    module: {
        loaders: [{
            test    : /\.jsx?$/,
            exclude : [/node_modules/, /typings/, /www/],
            loader  : "babel-loader",
            query   : {
                presets : ["react", "es2015"],
                plugins : ["transform-class-properties"]
            }
        }, {
            test   : /\.json$/,
            loader : "json-loader"
        }, {
            test   : /\.css$/,
            loader : "style-loader!css-loader"
        }, {
            test   : /\.(ttf|eot|otf|svg|woff(2)?)(\?[a-z0-9=&.]+)?$/,
            loader : "file-loader",
            query  : {
                mimeType: "application/octet-stream"
            }
        }, {
          test: /\.scss$/,
          loaders: ["style", "css", "sass"]
        }]
    },
    plugins: [
      new webpack.optimize.UglifyJsPlugin({
        compress: {
          warnings: false
        }
      }),
      new webpack.DefinePlugin({
        'process.env': {
          'NODE_ENV': JSON.stringify('production')
        }
      }),
      new webpack.ProvidePlugin({
        $: "jquery",
        jQuery: "jquery",
        _: "lodash"
      }),
    ],
    resolve: {
        extensions: ["", ".js", ".jsx"]
    },
    node: {
        fs: "empty"
    },
    devtool: 'cheap-module-source-map'

};