Summary: The goal of this stack is to gradually expand large data trees, rather than all at once. To enable that, we need to be able to distinguish 'expandability' vs. 'being expanded'. By moving computations from render to the component hooks and store the results locally, we get a step closer to that.
Reviewed By: jknoxville
Differential Revision: D21301927
fbshipit-source-id: cfb617214d4b2005796b33b41c1abe0032e41847
3726bddefc