[flow] v0.296.0

Declarations:

• The declare keyword can be omitted for declare const/let/var variable: type and declare component under a declaration context (libdef file, .js.flow file, declare module, declare namespace)
• declare component now requires the rest props to be named - matching normal component declarations

Misc:

• The Omit<O, K> utility type will no longer enforce that the provided keys K need to be part of O