Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/45349

This is on by default as of version 0.239.0:

https://github.com/facebook/flow/blob/v0.239/src/commands/config/flowConfig.ml#L268

Changelog: [Internal]

Reviewed By: SamChou19815

Differential Revision: D59525192

fbshipit-source-id: b4bf456e3c03a712f4c6f5d72d157b3abf8f9895