adjusted configuration to cover for compatibility on firefox and safari (#3107)

Author: wibed

react-18-ssr/shell/config/webpack.shared.js

@@ -21,6 +21,7 @@ const webpackConfig = {
       },
     ],
   },
+  optimization: { splitChunks: { chunks: 'initial' }}
 };
 
 module.exports = webpackConfig;