Summary:
This is a simple script that runs `tsc --strict` twice: on the current revision and the previous one, compares the number of errors and if there are more, prints them out and raises a failure exit code.
This should help us ensure that while we clean up the 500-odd errors we don't land more in the process.
Reviewed By: danielbuechele
Differential Revision: D17093671
fbshipit-source-id: 6c5d1424c729d15d66a32ae17f15b17c3b76fc68
