全ては無理だと思います bridging headerはspmに無いと思いますドキュメントは https://swift.org/package-manager/ https://github.com/apple/swift-package-manager/blob/master/Documentation/Usage.md ぐらい詳細はソース見る必要がありそう

Swift is a general-purpose programming language built using a modern approach to safety, performance, and software design patterns.

The Package Manager for the Swift Programming Language - apple/swift-package-manager