gunblade spellvamp works on what now

what does gunblade's healing work with now? so I read the wiki, it states:

Also unlike Death's Dance it heals for damage dealt with on-hit effects.

does this include wits end and devourer? how about udyr tiger stance bonus ad? and statik shiv's aoe?

also why do I need to refer to wikia for this. we need to be able to download a local pdf file of sorts for this stuff that we can update. should be in client tbh.

a lot of things are ambiguous and it would clarify much of this.