Feature request: Would love if this already exists and I'd missed it… I'd love to import Sketch files with each Artboard assigned to a state. This might enable a Keynote 'magic move' like ease of setting up some screens and animating between states.
Layer groups that are not common between states would have a copied/empty object that has 0 opacity for that state. Commonly-named layergroups between artboards could be copied into the same object as subgroups with some naming convention, and states set appropriately.
For example: With 2 artboards containing phoneApp.states.switch("favoritesTab") phoneApp.states.switch("recentsTab")