Про инициализацию обязательных параметров отметить

[Alex009]

class AuthFormSmsCodeViewModel(
    val eventsDispatcher: EventsDispatcher<EventsListener>,
    val exceptionHandler: ExceptionHandler,
    private val authRepository: AuthRepository,
    private val strings: Strings
) : ViewModel() {    
    private var phone: String = ""
    private var key: String = ""
    private var authType: AuthType = AuthType.SIGN_UP    

    fun setInitialAuthData(phone: String, key: String, authType: AuthType) {
        this.phone = phone
        this.key = key
        this.authType = authType
    }

bad code

class AuthFormSmsCodeViewModel(
    val eventsDispatcher: EventsDispatcher<EventsListener>,
    val exceptionHandler: ExceptionHandler,
    private val authRepository: AuthRepository,
    private val strings: Strings,
    private val phone: String,
    private val key: String,
    private val authType: AuthType
) : ViewModel() {    

}

good code