[swift-evolution] Module importation at project scope

[Vanderlei Martinelli]

Hello everybody.

I sent these two messages before, but I’m afraid this was a popular
requested feature or, I hope, it was gone unnoticed.

*#import (project scope import)*
https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160125/008461.html

*Pre-imported modules (sort of PCH)*
https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160125/007706.html

In many languages, including Swift, when we are developing apps (frameworks
are other history), we have to include/import dozens of libraries
references. The proposal is to have for app projects (maybe not for
frameworks projects) a way to say to Swift compiler that we are using some
module everywhere in the project code files, so we can expect the module to
be always available without a `import` on the top of each file. I suggest
one of the two alternatives:

1) To have a special type of import, `#import`.
2) have a kind of “PCH” file where we can list all modules we want to be
globally available at project scope.

Regards,

-Van
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