Use case

Pigeon supports using swift for iOS/MacOS and objective-c for iOS. TaskQueue is supported for objective-c, but the @TaskQueue annotation from pigeon does not seem to have any impact when using swift & iOS. The following code will use TaskQueue when using objective-c, but not swift.

@HostApi()
abstract class MyAPI {
  @async
  @TaskQueue(type: TaskQueueType.serialBackgroundThread)
  void doSomething();
}

Proposal

Add support for TaskQueue when using swift on iOS. One consideration is that TaskQueue is not supported on MacOS. Users will either need to know this, and only attempt to use it for iOS plugins, or pigeon could use TaskQueue on iOS only (not sure of the feasibility of that).

Reference

@TaskQueue from pigeon: https://pub.dev/documentation/pigeon/latest/pigeon_lib/TaskQueue-class.html