Is there a Prefix Header (or something with this functionality) in Swift?

Question

Is there a way to get the functionality of a prefix header in Swift? I don´t want to import external libs in every file where they are used.

Answer 1

There is a -enable-bridging-pch feature. But it seems that not working in Xcode 9 :(
I decided to write this ansewer just to fully cover the topic.