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Diffusion Comm 717b76b3d326

[Flow202][native][skip-ci] [32/x] Fix type errors in OverlayNavigator

Description

[Flow202][native][skip-ci] [32/x] Fix type errors in OverlayNavigator

Summary:
Separating this out because it requires exporting some types, introducing some new ones, and a non-types change in one place.

NOTE: CI will fail on this diff. I considered the possibility of fixing Flow errors BEFORE upgrading Flow, but it wasn't possible... in some cases, the fixes to support the new version of Flow caused errors in the old version. I could have hidden these type errors with $FlowFixMe lines and then later revert those, but that seemed like too much busy work.

Depends on D10015

Test Plan: Confirm the Flow errors go away

Reviewers: tomek

Reviewed By: tomek

Differential Revision: https://phab.comm.dev/D10016

Details