Background

CocoaPod plugins can use conditional compilation to allow an app to opt-in or out of certain features.

For example, the just_audio plugin is an audio player that has an optional microphone feature. Since microphone use has privacy concerns, the app must provide a usage description. If the app doesn't need this microphone feature, just_audio provides a compilation flag to remove the microphone feature entirely. The app can set this compilation flag in its CocoaPods configuration. See: ryanheise/just_audio#1368 (comment)

Unfortunately, Swift Package Manager does not support conditional compilation.

Known affected packages:

1. just_audio
2. permission_handler

Work

Options:

1. Document the known workaround. The workaround is hacky and not ideal...
2. Update Flutter to support Swift package traits if/when that lands