I don't think there's a purely technical reason a non-standard linter cannot exist, but it's probably a large investment to build such a tool (filtering false p

I don't think there's a purely technical reason a non-standard linter cannot exist, but it's probably a large investment to build such a tool (filtering false positives, etc.) and no one has made one sufficiently good and popular enough to be used for a simple one-file-utility.