Summary: Per title. Somehow both typecheck, but importing the module like this doesn't work.
Reviewed By: jknoxville
Differential Revision: D17285507
fbshipit-source-id: 40a38db5dfb52213e0407f8bda83f2ebad5c50c7
Summary: TSC actually found a type error here in `safeExec` which is nice.
Reviewed By: danielbuechele
Differential Revision: D16666740
fbshipit-source-id: 28a1ad12190d2351a48323f23c3a69947503625d