This is a fork of some scripts originally made by Craig Patik They are designed for Windows, though I'm sure they can be adjusted for *nix systems.
To use these scripts, run them as an administrator.
Also, you need to install the ZScaler SSL certificates (they are probably on your work machine if your company installed ZScaler--I exported them from Firefox), then add them to Git's SSL certificate bundle. See this answer on SO.
I am a bit confused since npm stores the certificates inside itself. Did you add something to npmrc config file to set some custom ca bundle?