SummerLoginByPhonePresenter.kt

interface LoginByPhoneView {
    var viewState: LoginByPhoneState
}

enum class LoginByPhoneState {
    Request,
    Confirm
}

class LoginByPhonePresenter : SummerViewModel<LoginByPhoneView>() {

    override val viewProxy = object : LoginByPhoneView {
        override var viewState by state({ it::viewState }, initial = LoginByPhoneState.Request)
    }

    fun onRequestCodeClick() {
        launch {
            val code = requestCodeRepository.execute()
            viewProxy.viewState = LoginByPhoneState.Confirm
        }
    }
}