webpack.config.js

const HtmlWebPackPlugin = require('html-webpack-plugin');

module.exports = () => ({
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /node_modules/,
                use: {
                    loader: 'babel-loader'
                }
            },
            {
                test: /\.scss$/,
                use: [
                    {
                        loader: 'style-loader'
                    },
                    {
                        loader: 'css-loader',
                        options: {
                            modules: true,
                            importLoaders: 1,
                            localIdentName: '[local]_[hash:base64]',
                            sourceMap: true
                        }
                    },
                    {
                        loader: 'sass-loader',
                        options: {
                            modules: true,
                            importLoaders: 1,
                            localIdentName: '[local]_[hash:base64]',
                            sourceMap: true
                        }
                    }
                ]
            }
        ]
    },
    plugins: [
        new HtmlWebPackPlugin({
            template: 'src/index.html'
        })
    ],
    devtool: 'cheap-module-eval-source-map'
});