GraphicsMagick - Cannot find name 'gm' (Warning)
It is working but I get this message in the editor and also in the terminal when run the app:

How do I avoid it? Is there any .typing for it I should include?
What message do you get in terminal?
maybe try im insted of gm
The same message above.
I tried im but it had errors with large images to create thumbnails. So the gm solve those errors, but looks like the compiler does not know about gm.
Looks like some external linting?
..as long as you have added the cfs:graphicsmagick package it should be available
https://github.com/CollectionFS/Meteor-cfs-graphicsmagick/blob/master/package.js#L20