Improve types
Improve types

Summary:
The any type was masking how the log object is actually initialised.

Sorry for the deluge of drive-by diffs. Something more substantial is coming.

Reviewed By: mweststrate

Differential Revision: D26250580

fbshipit-source-id: 5ba3f450ac1a646616868a8fd8b3cb42fb14dcc8

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper