Summary: Remove the validateOpts() that prevents full Flow typing. In turn, having full Flow typing will allow us to remove 'defaults' across the codebase, that are source of inconsistencies.
Reviewed By: davidaurelio, cpojer
Differential Revision: D4377823
fbshipit-source-id: 8bb0a6b5069de64a9bb9d63892cd08854da91777