Hi everyone,

I am currently working on a large project using many technologies and am responsible for the Flutter implementation. Based on native needs we want to get rid of CocoaPods in the long run. Therefore I am currently migrating a federated architecture plugin to SwiftPM. As the support is in active development, we will support both for a while, but I cannot quite figure out, how I can depend on the iOS code of a dependant plugin in another plugins iOS code.

I have the following dependency tree with pub:

x_sdk_flutter_example a.b.c
├── x_sdk_flutter a.b.c
│   ├── x_sdk_flutter_android...
│   ├── x_sdk_flutter_ios...
│   ├── x_sdk_flutter_platform_interface...
│   └── y...
├── x_sdk_flutter_android a.b.c
│   └── x_sdk_flutter_platform_interface...
├── x_sdk_flutter_ios a.b.c
│   └── x_sdk_flutter_platform_interface...
├── x_sdk_flutter_model a.b.c
├── x_sdk_flutter_pigeon a.b.c
├── x_sdk_flutter_platform_interface a.b.c
│   ├── x_sdk_flutter_model...
│   └── x_sdk_flutter_pigeon...
└── y a.b.c

My specific problem arises with x_sdk_flutter_ios transitive dependency on x_sdk_flutter_pigeon. I need to use the native pigeon in my platform implementation.

In CocoaPods I specified it like this:

Pod::Spec.new do |s|
  s.name             = 'x_sdk_flutter_ios'
  s.version          = 'a.b.c'
  s.summary          = 'Federated Architecture iOS Flutter Plugin for x'
  s.description      = <<-DESC
Federated Architecture iOS Flutter Plugin for x
                       DESC
  s.homepage         = '-'
  s.author           = { '-' => '-' }
  s.source           = { :path => '.' }
  s.source_files = 'x_sdk_flutter_ios/Sources/x_sdk_flutter_ios/**/*.swift'
  s.dependency 'Flutter'
  s.platform = :ios, '15.0'

  s.dependency 'x_sdk_flutter_pigeon'
  s.static_framework = true

  s.dependency 'native-x', 'a.b.c'
  s.static_framework = true

  # Flutter.framework does not contain a i386 slice.
  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
  s.swift_version = '5.0'
end

My Pigeons are generated like this:

@ConfigurePigeon(
  PigeonOptions(
    copyrightHeader: 'pigeons/copyright.txt',
    dartOut: 'lib/src/pigeons.g.dart',
    dartPackageName: 'x_sdk_flutter_pigeon',
    kotlinOut:
        'android/src/main/kotlin/[...]/x_sdk_flutter_pigeon/pigeons.g.kt',
    kotlinOptions: KotlinOptions(
      package: '[...].x_sdk_flutter_pigeon',
    ),
    swiftOut:
        'ios/x_sdk_flutter_pigeon/Sources/pigeons.g.swift',
  ),
)

It is a monorepo, but the packages are published using a private pub server and therefore are split at release.

How would I specify this dependency in x_sdk_flutter_ios?

Is and/or will this be supported when using SwiftPM? I haven't worked with SwiftPm prior to this, so it could be my problem. But I would assume a case like this should be covered here.