Writing GNOME applications with Swift

Swift is well-suited for creating user interfaces thanks to the clean syntax, static typing, and special features making code easier to write. Result builders, combined with Swift’s closure expression syntax, can significantly enhance code readability.

Adwaita for Swift leverages these Swift features to provide an intuitive interface for developing applications for the GNOME platform.
↫ The Swift blog

It seems the Swift project is actively trying to move beyond being the ‘Apple programming language’.