You can use this app for test some features of libraries that you want to implement into your application or test some codes that you want to show someone,
note, you can't use all libraries that you want, some libraries might not work here.
I created this application with Stephen Grider into his course and i left some features off and implemented some updates to the libraries that were
used here, like the monaco, react-resizable for instance, and i made some implementations into the source code and on the css side.