Where can I see the contents of the Common module?

I tried googling it but I didn’t find anything useful. Any help looking for documentation of modules in Ocaml? Specially the common module?

Code I have:

open Common

It depends on what package it comes from. Your build system should tell you what packages you’re using in this project. Ideally, if you have good editor tooling setup you can put the cursor on the name Common and run the ‘jump to definition’ command and it will take you to the exact file where it’s defined. If your packages are installed with opam the file should be somewhere under ~/.opam/SWITCH-NAME/lib/, where SWITCH-NAME is the name of your current opam switch.

I made my real question here: