webpack.config.js

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

module.exports = {
    entry: '',
    output: {
        path: path.resolve(__dirname, ''),
        filename: '',
        library: '',
        libraryTarget: 'umd'
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                include: path.resolve(__dirname, ''),
                exclude: /(node_modules|library)/,
                use: {
                    loader: 'babel-loader',
                }
            },
            {
                test: /\.scss$/,
                include: [],
                use: [
                    {loader: "style-loader"},
                    {loader: "css-loader"},
                    {loader: "sass-loader"}
                ]
            },
            {
                test: /\.css$/,
                use: [
                    {loader: "style-loader"},
                    {loader: "css-loader"},
                    {loader: "sass-loader"}
                ]
            },
        ]
    },
    plugins: [
        new webpack.DefinePlugin({
            'process.env': {
                'NODE_ENV': JSON.stringify('production')
            }
        }),
        new webpack.optimize.UglifyJsPlugin(),
        new webpack.optimize.AggressiveMergingPlugin(),
        new CompressionPlugin({
            asset: "[path].gz[query]",
            algorithm: "gzip",
            test: /\.js$|\.css$|\.html$/,
            threshold: 10240,
            minRatio: 0.8
        })
    ],
    externals: {
        react: {
            root: 'React',
            commonjs2: 'react',
            commonjs: 'react',
            amd: 'react'
        },
        'react-dom': {
            root: 'ReactDOM',
            commonjs2: 'react-dom',
            commonjs: 'react-dom',
            amd: 'react-dom'
        }
    },
    devServer: {
        inline: true,
        port: 9001
    },
};