NONAME8

@implementation FIRAuth {
  /** @var _currentUser
      @brief The current user.
   */
  FIRUser *_currentUser;

  /** @var _firebaseAppName
      @brief The Firebase app name.
   */
  NSString *_firebaseAppName;

  /** @var _listenerHandles
      @brief Handles returned from @c NSNotificationCenter for blocks which are "auth state did
          change" notification listeners.
      @remarks Mutations should occur within a @syncronized(self) context.
   */
  NSMutableArray<FIRAuthStateDidChangeListenerHandle> *_listenerHandles;

  /** @var _keychain
      @brief The keychain service.
   */
  FIRAuthKeychain *_keychain;

  /** @var _lastNotifiedUserToken
      @brief The user access (ID) token used last time for posting auth state changed notification.
   */
  NSString *_lastNotifiedUserToken;

  /** @var _autoRefreshTokens
      @brief This flag denotes whether or not tokens should be automatically refreshed.
      @remarks Will only be set to @YES if the another Firebase service is included (additionally to
        Firebase Auth).
   */
  BOOL _autoRefreshTokens;

  /** @var _autoRefreshScheduled
      @brief Whether or not token auto-refresh is currently scheduled.
   */
  BOOL _autoRefreshScheduled;

  /** @var _isAppInBackground
      @brief A flag that is set to YES if the app is put in the background and no when the app is
          returned to the foreground.
   */
  BOOL _isAppInBackground;

  /** @var _applicationDidBecomeActiveObserver
      @brief An opaque object to act as the observer for UIApplicationDidBecomeActiveNotification.
   */
  id<NSObject> _applicationDidBecomeActiveObserver;

  /** @var _applicationDidBecomeActiveObserver
      @brief An opaque object to act as the observer for
          UIApplicationDidEnterBackgroundNotification.
   */
  id<NSObject> _applicationDidEnterBackgroundObserver;
}

class Auth {
 class func auth() -> FIRAuth { ... }
 ...
}

class FIRAuth {
  var currentUser: FIRUser?
  ...
}

class FIRUser {
 var providerData: [Int : {что-то}]
 ...
}

Auth.auth().currentUser?.providerData[indexPath.row]

FUIAuth.defaultAuthUI()?.handleOpen(url, sourceApplication: sourceApplication)

FUIAuth.defaultAuthUI()?.handleOpen(url, sourceApplication: sourceApplication) ?? false

class Time {
    var seconds:Double = 0
    
    init(seconds: Double) {
        self.seconds = seconds
    }
    
    var minutes: Double {
        get {
            return (seconds / 60)
        }
        set {
            self.seconds = (newValue * 60)
        }
    }
    
    var hours: Double {
        get {
            return (seconds / (60 * 60))
        }
        set {
            self.seconds = (newValue * (60 * 60))
        }
    }
    
    var days:  Double {
        get {
            return (seconds / (60 * 60 * 24))
        }
        set {
            self.seconds = (newValue * (60 * 60 * 24))
        }
    }
}

case deviceOwnerAuthenticationWithBiometrics
Indicates that the device owner must authenticate using biometry. // Юзаем только биометрию

case deviceOwnerAuthentication
Indicates that the device owner can authenticate using biometry or the device password. //Юзаем биометрия и если её нет, то Пароль

if contex.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil) {
            contex.evaluatePolicy(LAPolicy.deviceOwnerAuthentication, localizedReason: "Use TouchID", reply: { wasSuccessful, _ in

                if wasSuccessful {
                    print("Все получилось")
                    let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
                    let homeVC = mainStoryboard.instantiateViewController(withIdentifier: "HomeVC")
                    self.navigationController?.pushViewController(homeVC, animated: true)
                } else {
                    print("Что-то пошло не так")
                }
            })
        }

export function registerUserWithEmailAndPassword(nickname, email, password) {
    return (dispatch) => {
        firebase.auth()
            .createUserWithEmailAndPassword(email, password)
            .then((user) => {
                firebase.database()
                    .ref('usersChat/' + user._user.uid)
                    .set({
                        nickname: nickname,
                        uid: user._user.uid,
                        timestamp: Date.now(),
                        email: email
                    })
                return user
            })
        
            .catch((error) => {
                // Handle Errors here.
                var errorCode = error.code;
                var errorMessage = error.message;
                dispatch({
                    type: types.userRegisterErr,
                    payload: errorMessage
                });
            });
    }
}

A := A-N; B := B-N*2; C := C-N;
N := N*4;

если A > 0 то 
    N := N+1;
    если B > 0 то
        N := N+1;
        если C > 0 то
            N := N+1;