CurrentValuePublished.swift

@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
extension Publisher where Self.Failure == Never {
    
    func assign(to failablePublished: CurrentValuePublished<Self.Output,Self.Failure>) -> AnyCancellable {
        self.assign(to: \.wrappedValue, on: failablePublished)

    }
}

@available(macOS 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *)
@propertyWrapper
class CurrentValuePublished<Value,Failure> where Failure: Error {

    var wrappedValue: Value {
        get {
            _subject.value
        }
        set {
            _subject.send(newValue)
        }
    }

    var subject: AnyPublisher<Value,Failure> {
        _subject.eraseToAnyPublisher()
    }
    
    var projectedValue: CurrentValuePublished<Value,Failure> {
        self
    }

    private var _subject: CurrentValueSubject<Value,Failure>

    init(wrappedValue: Value, ErrorType: Failure.Type) {
        self._subject = .init(wrappedValue)
    }
    
    init(wrappedValue: Value) where Failure == Never {
        self._subject = .init(wrappedValue)
    }

}