@NativeCoroutinesState and StateFlow<Double>

[sailquilt]

Hi, I'm migrating to KMP-NativeCoroutines and things are working really well so far.

I'm a bit confused on how to use @NativeCoroutinesState with StateFlow.

I have a Kotlin class with the following members:

    private val _foo = MutableStateFlow<Double>(1.0)
    
    @NativeCoroutinesState
    val foo = _foo.asStateFlow()

in my Swift view model I have the following:

        let myFoo: Double = node.foo // this works
        createPublisher(for: node.fooFlow)
            .sink(
                receiveCompletion: { completion in },
                receiveValue: { newValue in
                    let myFoo2: Double = newValue // this fails with error: Cannot convert value of type 'KotlinDouble' to specified type 'Double'
                }
            )
            .store(in: &cancellables)

I was expecting node.fooFlow to give me a type Double, not KotlinDouble.

Also, I'm not sure how to use @NativeCoroutinesRefinedState. If I try using @NativeCoroutinesRefinedState in the above code the member is simply removed.

[rickclephas]

Hi!

I was expecting node.fooFlow to give me a type Double, not KotlinDouble.

Yeah there are some edge cases in the Kotlin-ObjC interop when used with callbacks (which are being generated by KMP-NativeCoroutines).
You could indeed make this a little nicer with @NativeCoroutinesRefinedState.

Also, I'm not sure how to use @NativeCoroutinesRefinedState. If I try using @NativeCoroutinesRefinedState in the above code the member is simply removed.

Correct, the refined annotations effectively hide the declarations from autocomplete.
The declarations still exist, but are prefixed with __. Something like the following should work:

extension MyClass {
    var foo: Double { 
        self.__foo
    }
    var fooPublisher: AnyPublisher<Double, Error> {
        createPublisher(for: self.__fooFlow).map { $0.doubleValue }
    }
}