webpack.config.js

var path = require('path');

module.exports = {
    mode: 'production',
    entry: './src/index.js',
    output: {
        path: path.resolve('build'),
        filename: 'index.js',
        libraryTarget: 'commonjs2'
    },
    module: {
        rules: [
            {
                test: /\.jsx?$/,
                exclude: /(node_modules)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['env']
                    }
                }
            },
            {
                test: /\.css$/,
                use: ['style-loader',
                    {
                        loader: 'css-loader',
                        options: {
                            importLoaders: 1,
                            modules: {
                                localIdentName: '[name]__[local]___[hash:base64:5]'
                            },


                        }
                    }],
            }
        ]
    }
}