In the flat login sing app template I found that few library are deprecated or no longer support with latest version of NodeJS ( 14v ) , this may cause severe security issue below are the few libraries. Hence we cant use the latest versin of Node. This is a major concern.
1.html-webpack-plugin 2.axios 3.eslint-loader 4.react-images 5.react-alerts 6.amcharts
also there are lot of unmet dependencies in bootstrap , connected-react-router and other libraries as well.