Using either Promise or Q, tern fails to infer the type of the success handler arguments. I wouldn't say this is a limitation of the tern type inferencer, but it seems like a good candidate for a plugin. Before I look too far into implementing one I was wondering:

a) does such a plugin exist?
b) is this possible with a plugin?
c) how much pain would be involved implementing such a plugin?

And perhaps, more abstractly:
d) is there a central location where developers contribute their tern plugins?