Extending the WordPress Create Block Script webpack Config with Polyfil's and Minification

package.json

{
	"name": "plugin-slug",
	"version": "0.1.0",
	"description": "Plugin Description",
	"author": "The WordPress Contributors",
	"license": "GPL-2.0-or-later",
	"main": "build/index.js",
	"scripts": {
		"build": "wp-scripts build",
		"lint:css": "wp-scripts lint-style",
		"lint:js": "wp-scripts lint-js",
		"start": "wp-scripts start",
		"packages-update": "wp-scripts packages-update"
	},
	"devDependencies": {
		"@wordpress/scripts": "^7.1.0",
		"css-loader": "^3.4.2",
		"ignore-emit-webpack-plugin": "^2.0.2",
		"mini-css-extract-plugin": "^0.9.0",
		"node-sass": "^4.13.1",
		"optimize-css-assets-webpack-plugin": "^5.0.3",
		"postcss-loader": "^3.0.0",
		"postcss-preset-env": "^6.7.0",
		"sass-loader": "^8.0.2",
		"terser-webpack-plugin": "^2.3.5"
	}
}

webpack.config.js

const defaultConfig = require( '@wordpress/scripts/config/webpack.config' );
const IgnoreEmitWebPackPlugin = require( 'ignore-emit-webpack-plugin' );
const MiniCssExtractPlugin = require( 'mini-css-extract-plugin' );
const OptimizeCssAssetsWebpackPlugin = require('optimize-css-assets-webpack-plugin');
const postcssPresetEnv = require( 'postcss-preset-env' );
const production = 'development' !== process.env.NODE_ENV;
const TerserWebPackPlugin = require( 'terser-webpack-plugin' );

module.exports = {
    ...defaultConfig,
    module: {
        ...defaultConfig.module,
        rules: [
            ...defaultConfig.module.rules,
            {
                test: /\.s[ac]ss$/i,
                use: [
                    { loader: MiniCssExtractPlugin.loader },
                    { loader: 'css-loader' },
                    {
						loader: 'postcss-loader',
						options: {
							plugins: () => [ postcssPresetEnv( { stage: 3 } ) ],
						},
					},
                    { loader: 'sass-loader' },
                ],
            },
        ],
    },
    optimization: {
        ...defaultConfig.optimization,
        minimize: true,
        minimizer: [ 
            new OptimizeCssAssetsWebpackPlugin(),
            new TerserWebPackPlugin(),
        ],
		splitChunks: {
			cacheGroups: {
                default: false,
				editor: {
                    chunks: 'all',
					enforce: true,
					name: 'editor',
					test: /editor\.s[ac]ss$/i,
				},
				style: {
                    chunks: 'all',
					enforce: true,
					name: 'style',
					test: /style\.s[ac]ss$/i,
				},
			},
		},
	},
    plugins: [
        ...defaultConfig.plugins,
        new IgnoreEmitWebPackPlugin( [ 'editor.js', 'style.js' ] ),
        new MiniCssExtractPlugin( {
            filename: '../[name].css',
        } ),
    ],
};

if ( production ) {
    module.exports.devtool = false;
}