If you have a weird var (no error, but... unusual) like this (below; in my case, a typo),
an error isn't detected, yet requireOnce("SOME_MODULE") completely skips over and doesn't even attempt to load anything within the module.
It should either
A) Error in the editor when we try to save
B) requireOnce() should load anyway so we know where the error is (instead of skipping the entire module). In my case, it was camouflaged and I had to delete one func at a time and debug until I found it.
(PS -- on FireFox desktop, pasting an image directly into this support ticket creates *two* images)