swift-async-asyncstream

When you have an Actor which exposes an async stream but you want to just expose the async stream in your interface

Example

When you have the following code

struct Interface {
  var makeStream: () -> AsyncStream<Int>
}

actor MyActor {
  func makeStream() -> AsyncStream<Int>  { 
      // ... 
  }
}

this code won't compile:

let actor = MyActor()
Interface { 
  actor.makeStream() // ❌ 'async' call in a function that does not support concurrency
}

// or

Interface { 
  await actor.makeStream() // ❌ Cannot pass function of type '() async -> AsyncStream<Int>' to parameter expecting synchronous function type
}

Use the new initialiser the code actualy compiles

Interface { 
  AsyncStream { 
    await actor.makeStream() 
  }
}