I'm trying to use `KMP-NativeCoroutines` library and I'm getting `Escaping closure captures mutating...

# multiplatform

[Osman Saral]

I'm trying to use KMP-NativeCoroutines library and I'm getting Escaping closure captures mutating 'self' parameter error.

The shared ViewModel has this:

private val _incomingMessage = MutableSharedFlow<Incoming>(10)
@NativeCoroutines
val incomingMessage = _incomingMessage.asSharedFlow()

Any idea what's wrong?

[Rick Clephas]

Could you share some more of the Swift code? Specifically regarding self and mainViewModel.

[Osman Saral]

Sure:

@main
struct MyApp: App {
    let mainViewModel: MainViewModel = inject()
    
    init() {
        print("Starting app")
        KoinApplication.start()
        
        let handle = Task {
            do {
                let sequence = asyncSequence(for: self.mainViewModel.incomingMessage)
                for try await message in sequence {
                    print("Message: \(message)")
                }
            } catch {
                print("Failed with error: \(error)")
            }
        }
    }
}



func inject<T : AnyObject>() -> T {
    return KoinApplication.shared.koin.get(objCClass: T.self) as! T
}


typealias KoinApplication = Koin_coreKoinApplication

extension KoinApplication {
    static let shared = KoinIOSKt.doInitKoinIos()

  @discardableResult
  static func start() -> KoinApplication {
    shared
  }
}

[Rick Clephas]

Seems that is to be expected due to init being mutating. Adding [self] should fix it:

let handle = Task { [self] in

source

[Osman Saral]

Thank you @Rick Clephas. I knew how to fix it but still I didn't understand what's wrong. Which init is mutating?

[Rick Clephas]

The init of the MyApp struct. Inside the init self is mutating which is captured by the Tasks escaping closure.
Per the comment: that is and error by default, unless explicitly specifying the captured self (which makes self immutable).

[Osman Saral]

Oh okay, all init s are mutating. Got it, thank you