config-overrides.js

const JavaScriptObfuscator = require('webpack-obfuscator');
const webpack = require('webpack');
const CompressionPlugin = require('compression-webpack-plugin');

module.exports = function override(config, env) {
	if (!config.plugins) {
		config.plugins = [];
	}
	config.plugins.push(new webpack.DefinePlugin({ 'process.env.BUILD_EXPIRE': JSON.stringify(process.env.BUILD_EXPIRE) }));

	const version = process.env.REACT_APP_GIT_SHA || 'snapshot';
	const commonJSFilename = `commons.${version}.js`;

	if (process.env.NODE_ENV === 'production') {
		config.optimization = {
			splitChunks: {
				cacheGroups: {
					commons: {
						chunks: 'initial',
						minChunks: 1,
						name: 'commons',
						filename: commonJSFilename,
						enforce: true,
					},
				},
			},
		};

		const domain = process.env.BUILD_DOMAIN ? process.env.BUILD_DOMAIN.split(',') : [];

		config.plugins.push(
			new CompressionPlugin({
				filename: '[path].gz[query]',
				algorithm: 'gzip',
				test: /\.js$|\.css$|\.html$/,
				threshold: 10240,
				minRatio: 0.8,
			}),
		);
	}

	return config;
};