github.com/RougeWare/Swift-Cross-Kit-Types (swiftpm): Some types and extensions for those using AppKit and UIKit in the same project
Keywords: appkit|cross-kit-types|cross-platform|protocol|protocol-oriented|protocol-oriented-programming|protocols|spm|swift|swift-package|swift-package-manager|swift-protocols|swiftpackage|swiftpackagemanager|swiftui|uikit