Summary:
This fixes some style errors found by dtslint, along with some test cases for StyleSheet.compose() where the recent change made it slightly too permissive when explicit return types are given. I also added runs of the TS tests to a script which runs in sandcastle so we can catch this at diff-submission time in the future.
Changelog:
[General][Fixed] - Fix Errors with TypeScript Tests
Reviewed By: lunaleaps
Differential Revision: D42085257
fbshipit-source-id: 7e6ca49d3c3aef822c61c97ecc07b55b0a949d51