-
Asset catalogues and Core Data models, as well as other Xcode specific resource types are not supported by
swift build
. IIRC if you are using tools-version 5.5 or later, you'll get a warning for those to make this more obvious. -
The bundle is additional content on the filesystem that needs to be present at runtime, so if you e.g. copy the executable somewhere, you will need to copy the resource bundle as well. That's what I meant by saying "bring along".