GT.M is installed and you have all environment variables set-up. I (unfortunately) already had that done from ewd.js. So I can't show it. See nodem repo for instructions on setting up $GTM_CI and setting the map file that goes with it.
NB: My ~ folder has database, which contains my VISTA, in which I am doing all of this. That's why I am using relative paths, and not ~ offset paths.