Same issue. Trying to add Alamofire 4.9.1 (fairly well-known library supporting both Cocoapods and SPM).
alande
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My project in an existing (pre Xcode 11.4 and pre-SPM). I used Xcode 11.4 to open the project, and added a package via the Xcode UI.I couldn't find anywhere a generated Package.swift file to edit. It seems as these references are in the .xcodeproj file.