webpack.prod.config.js

const path = require('path');
const autoprefixer = require('autoprefixer');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
    entry: {
        index: './src/index.js',
    },
    output: {
        filename: '[name].js',
        path: path.join(__dirname, 'lib/'),
        libraryTarget: 'commonjs2',
    },
    module: {
        rules: [
            {
                test: /\.jsx?/,
                loader: 'babel-loader',
                include: path.join(__dirname, 'src'),
            },
            {
                test: /\.json$/,
                loader: 'json-loader',
            },
            {
                test: /\.(ico|jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2)(\?.*)?$/,
                loader: 'file-loader',
                query: {
                    name: 'static/[name].[ext]',
                },
            },
            {
                test: /\.css$/,
                use: ExtractTextPlugin.extract({
                    fallback: 'style-loader',
                    use: [
                        {
                            loader: 'css-loader',
                            options: {
                                importLoaders: 1,
                            },
                        },
                        {
                            loader: 'postcss-loader',
                            options: {
                                ident: 'postcss',
                                plugins: () => [
                                    require('postcss-flexbugs-fixes'),
                                    autoprefixer({
                                        browsers: [
                                            '>1%',
                                            'last 4 versions',
                                            'Firefox ESR',
                                            'not ie < 9',
                                        ],
                                        flexbox: 'no-2009',
                                    }),
                                ],
                            },
                        },
                    ],
                }),
            },
        ],
    },
    plugins: [new ExtractTextPlugin('index.css')],
};