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           /*
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            * Copyright 2017 Google
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            *
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            * Licensed under the Apache License, Version 2.0 (the "License");
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            * you may not use this file except in compliance with the License.
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            * You may obtain a copy of the License at
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            *
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            *      http://www.apache.org/licenses/LICENSE-2.0
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            *
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            * Unless required by applicable law or agreed to in writing, software
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            * distributed under the License is distributed on an "AS IS" BASIS,
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            * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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            * See the License for the specific language governing permissions and
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            * limitations under the License.
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            */
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           #import <FirebaseCore/FIRApp.h>
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           @class FIRComponentContainer;
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           @protocol FIRLibrary;
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           /**
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            * The internal interface to `FirebaseApp`. This is meant for first-party integrators, who need to
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            * receive `FirebaseApp` notifications, log info about the success or failure of their
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            * configuration, and access other internal functionality of `FirebaseApp`.
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            *
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            * TODO(b/28296561): Restructure this header.
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            */
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           NS_ASSUME_NONNULL_BEGIN
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           typedef NS_ENUM(NSInteger, FIRConfigType) {
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             FIRConfigTypeCore = 1,
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             FIRConfigTypeSDK = 2,
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           };
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           extern NSString *const kFIRDefaultAppName;
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           extern NSString *const kFIRAppReadyToConfigureSDKNotification;
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           extern NSString *const kFIRAppDeleteNotification;
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           extern NSString *const kFIRAppIsDefaultAppKey;
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           extern NSString *const kFIRAppNameKey;
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           extern NSString *const kFIRGoogleAppIDKey;
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           extern NSString *const kFirebaseCoreErrorDomain;
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           /** The `UserDefaults` suite name for `FirebaseCore`, for those storage locations that use it. */
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           extern NSString *const kFirebaseCoreDefaultsSuiteName;
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           /**
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            * The format string for the `UserDefaults` key used for storing the data collection enabled flag.
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            * This includes formatting to append the `FirebaseApp`'s name.
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            */
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           extern NSString *const kFIRGlobalAppDataCollectionEnabledDefaultsKeyFormat;
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           /**
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            * The plist key used for storing the data collection enabled flag.
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            */
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           extern NSString *const kFIRGlobalAppDataCollectionEnabledPlistKey;
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           /** @var FirebaseAuthStateDidChangeInternalNotification
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            @brief The name of the @c NotificationCenter notification which is posted when the auth state
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            changes (e.g. a new token has been produced, a user logs in or out). The object parameter of
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            the notification is a dictionary possibly containing the key:
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            @c FirebaseAuthStateDidChangeInternalNotificationTokenKey (the new access token.) If it does not
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            contain this key it indicates a sign-out event took place.
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            */
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           extern NSString *const FIRAuthStateDidChangeInternalNotification;
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           /** @var FirebaseAuthStateDidChangeInternalNotificationTokenKey
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            @brief A key present in the dictionary object parameter of the
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            @c FirebaseAuthStateDidChangeInternalNotification notification. The value associated with this
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            key will contain the new access token.
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            */
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           extern NSString *const FIRAuthStateDidChangeInternalNotificationTokenKey;
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           /** @var FirebaseAuthStateDidChangeInternalNotificationAppKey
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            @brief A key present in the dictionary object parameter of the
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            @c FirebaseAuthStateDidChangeInternalNotification notification. The value associated with this
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            key will contain the FirebaseApp associated with the auth instance.
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            */
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           extern NSString *const FIRAuthStateDidChangeInternalNotificationAppKey;
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           /** @var FirebaseAuthStateDidChangeInternalNotificationUIDKey
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            @brief A key present in the dictionary object parameter of the
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            @c FirebaseAuthStateDidChangeInternalNotification notification. The value associated with this
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            key will contain the new user's UID (or nil if there is no longer a user signed in).
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            */
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           extern NSString *const FIRAuthStateDidChangeInternalNotificationUIDKey;
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           @interface FIRApp ()
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           /**
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            * A flag indicating if this is the default app (has the default app name).
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            */
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           @property(nonatomic, readonly) BOOL isDefaultApp;
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           /*
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            * The container of interop SDKs for this app.
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            */
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           @property(nonatomic) FIRComponentContainer *container;
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           /**
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            * Checks if the default app is configured without trying to configure it.
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            */
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           + (BOOL)isDefaultAppConfigured;
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           /**
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            * Registers a given third-party library with the given version number to be reported for
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            * analytics.
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            *
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            * @param name Name of the library.
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            * @param version Version of the library.
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            */
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           + (void)registerLibrary:(nonnull NSString *)name withVersion:(nonnull NSString *)version;
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           /**
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            * Registers a given internal library to be reported for analytics.
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            *
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            * @param library Optional parameter for component registration.
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            * @param name Name of the library.
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            */
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           + (void)registerInternalLibrary:(nonnull Class<FIRLibrary>)library
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                                  withName:(nonnull NSString *)name;
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           /**
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            * Registers a given internal library with the given version number to be reported for
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            * analytics. This should only be used for non-Firebase libraries that have their own versioning
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            * scheme.
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            *
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            * @param library Optional parameter for component registration.
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            * @param name Name of the library.
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            * @param version Version of the library.
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            */
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           + (void)registerInternalLibrary:(nonnull Class<FIRLibrary>)library
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                                  withName:(nonnull NSString *)name
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                               withVersion:(nonnull NSString *)version;
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           /**
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            * A concatenated string representing all the third-party libraries and version numbers.
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            */
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           + (NSString *)firebaseUserAgent;
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           /**
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            * Can be used by the unit tests in each SDK to reset `FirebaseApp`. This method is thread unsafe.
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            */
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           + (void)resetApps;
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           /**
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            * Can be used by the unit tests in each SDK to set customized options.
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            */
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           - (instancetype)initInstanceWithName:(NSString *)name options:(FIROptions *)options;
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           @end
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           NS_ASSUME_NONNULL_END
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