Consider Enabling Non-Swift Programming Languages to Add Content to the Xcode Library

Originator:RandomDSdevel
Number:rdar://FB79397427 Date Originated:07/11/2020
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode version 12.0 beta 2 (12A6163b)
Classification:Xcode Reproducible:
 
While watching WWDC 2020 session 10649, "Add custom views and modifiers to the Xcode Library," it occurred to me that it would be nice if other, non-Swift languages supported by Xcode could add content to the IDE's Library using either:  

 - An API that's either a direct port of or is similar to Swift's `LibraryContentProvider` protocol.  (This should be a good fit for Objective-C/Objective-C++, as those languages have protocols.  
 - Some other API akin and functionally equivalent to it.  (For plain C and C++, which don't support protocols.)

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