@interface FIRConfiguration : NSObject
This interface provides global level properties that the developer can tweak.
Returns the shared configuration object.
@property (readonly, nonatomic, class) FIRConfiguration *_Nonnull sharedInstance;
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 FIRLoggerLevelNotice even if loggerLevel is set to a higher (more verbose) setting.
The maximum logging level. The default level is set to FIRLoggerLevelNotice.