void.cat/webpack.config.js

const path = require('path');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const TerserJSPlugin = require('terser-webpack-plugin');
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin');

module.exports = {
    entry: {
        bundle: './src/js/index.js',
        sw: './src/js/Worker.js'
    },
    output: {
        filename: '[name].js',
        path: path.resolve(__dirname, 'dist')
    },
    module: {
        rules: [
            {
                test: /\.scss$/,
                use: [MiniCssExtractPlugin.loader, "css-loader", "sass-loader"]
            }
        ]
    },
    mode: 'production',
    optimization: {
        usedExports: true,
        minimizer: [new TerserJSPlugin(), new OptimizeCSSAssetsPlugin()]
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: '[name].css',
            chunkFilename: '[id].css',
            path: path.resolve(__dirname, 'dist')
        })
    ]
};