webpack.config.js

var webpack = require('webpack');
var path = require('path');
var CompressionPlugin = require("compression-webpack-plugin");

var BUILD_DIR = path.resolve(__dirname, 'public');
var APP_DIR = path.resolve(__dirname, 'app');

new webpack.DefinePlugin({
    'process.env': {
        NODE_ENV: JSON.stringify('production')
    }
}), new webpack.optimize.UglifyJsPlugin();

function isExternal(module) {
    var userRequest = module.userRequest;

    if (typeof userRequest !== 'string') {
        return false;
    }

    return userRequest.indexOf('bower_components') >= 0 ||
        userRequest.indexOf('node_modules') >= 0 ||
        userRequest.indexOf('libraries') >= 0;
}

var config = {
    entry: {
        app: APP_DIR + '/index.jsx',
        vendor: [
            'history',
            'react',
            'react-dom',
            'react-router'
        ]
    },

    output: {
        path: BUILD_DIR,
        filename: 'bundle.js'
    },
    plugins: [
        new webpack.optimize.CommonsChunkPlugin('vendor', 'vendor.bundle.js'),

        new webpack.DefinePlugin({
            'process.env': {
                'NODE_ENV': JSON.stringify('production')
            }
        }),
        new webpack.optimize.DedupePlugin(),
        new webpack.optimize.UglifyJsPlugin(),
        new webpack.optimize.AggressiveMergingPlugin()

    ],
    module: {
        loaders: [
            {
                test: /\.jsx?/,
                include: APP_DIR,
                exclude: /node_modules/,
                loader: 'babel',
                query:
                {
                    presets:['es2015','react']
                }
            },
            {
                test: /\.scss$/,
                loaders: ['style', 'css', 'sass']
            },
            {
                test: /\.css$/,
                loader: 'css-loader',
                query: {
                    modules: true,
                    localIdentName: '[name]__[local]___[hash:base64:5]'
                }
            },
            {
                test: /\.scss$/,
                loader: 'sass-loader',
                query: {
                    modules: true,
                    localIdentName: '[name]__[local]___[hash:base64:5]'
                }
            }
        ]
    },
    resolve: {
        modulesDirectories: ['node_modules'],
        extensions: ['', '.js', '.jsx']
    },
    target: 'web',
    // Loader options
    eslint: {
        failOnWarning: false,
        failOnError: true
    }
};

module.exports = config;