FIRConfiguration
@interface FIRConfiguration : NSObjectThis interface provides global level properties that the developer can tweak.
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                  Returns the shared configuration object. DeclarationObjective-C @property (class, nonatomic, readonly) NS_SWIFT_NAME(shared) FIRConfiguration *sharedInstance;
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                  Sets the logging level for internal Firebase logging. Firebase will only log messages that are logged at or below loggerLevel. The messages are logged both to the Xcode console and to the device’s log. Note that if an app is running from AppStore, it will never log above.noticeeven ifloggerLevelis set to a higher (more verbose) setting.DeclarationObjective-C - (void)setLoggerLevel:(FIRLoggerLevel)loggerLevel;ParametersloggerLevelThe maximum logging level. The default level is set to FIRLoggerLevelNotice. 
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                  Returns the logging level for internal Firebase logging. DeclarationObjective-C - (FIRLoggerLevel)loggerLevel;