I was thinking that it would be quite useful to have access to the script path (main script) from within the script itself.
I see that ScriptCs provides this through Env.ScriptPath which is great apart from the fact that OmniSharp does not recognize the Env type and squiggly lines appears in VS Code.

A simple and possible naive solution might be to pass the path of the main script as the first argument to the script. I guess that would be the WorkingDirectory from the ScriptContext class or something like that.