Mac code - run on Windows

I have a react-native app that was originally coded on a Mac machine. When trying to run this code on windows there are an immense number of errors thrown, and it won't run (obviously).

As this is just 'code', I'm wondering what possible issues might be causing this code ( which does run on the Mac, and is in production ) to fail when using VS Code on Windows. All packages from the original Mac code have been successfully installed.

I can post the list of errors if anyone feels a need to look at them as I cannot make much sense of them.

Thanks in advance. Any suggestions are much appreciated.