Former long-time mobile eng at Meta here: RN is considered by most internally to be hot garbage and very unpleasant to work with. They have 2 or 3 other React-

Former long-time mobile eng at Meta here: RN is considered by most internally to be hot garbage and very unpleasant to work with. They have 2 or 3 other React-like internal frameworks that most of the apps are made with. ComponentKit is the main one for the Blue App, and IIRC that's open source.