I looked briefly at the codebase and couldn’t see any reason this wouldn’t be passed along.
@mikerod Would you mind sharing where you looked? I thought about taking a look at the code myself, but I wasn't sure where to start. Also, when I have a chance, I'll try to create a minimalist reproduction.
I only did a search for :externs in the codebase & also looked a little at where it was messing with cljs compiler options. Nothing struck me as special with regards to this key.
Having a smaller reproduction may be insightful. Could even try launching a repl within the fig main codebase to see where it may be lost if it is.
OK. I'll have a look around. Thanks!