webpack.config.js

var path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');

module.exports = {
  entry: './App.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'app.bundle.js'
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader', 
                    options: { presets: ['env', 'react'] }
                }
            },
            {
                test: /\.(s*)css$/,
                use: [
                    { loader: MiniCssExtractPlugin.loader },
                    'css-loader',
                    'sass-loader',
                ],
            }, 
        ]
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: 'assets/[name].css',
        }),
    ]
};