Just re-export whatever you import, or import proxy/forwarding.
Bar Module depends on Foo Module, and use @_exported import Foo re-export Foo Module.
Baz depends on Bar.
https://forums.swift.org/t/what-does-exported-import-do/35869/3
https://stackoverflow.com/questions/41000256/what-is-import-func-struct-class-and-exported-in-swift