What’s next for Foundation

[xwu (Xiaodi Wu)]

@Alejandro_Martinez

Is this something the language (or SPM) would be able to support eventually? Is very useful for library design and modularization.

This is the already pitched cross-import overlays:

Cross-import overlays

This is a follow-up to the previous pitch by @typesanitizer. Cross-import overlays allow Swift to automatically import additional “overlay” modules based on the combination of imports in a particular source file. They allow one library or framework to seamlessly offer tailored APIs for interoperating with another, without imposing additional dependencies or code on clients who don’t need it. This feature has now been implemented and is in master and 5.3 nightly compilers, hidden behind the -…