FIRRemoteConfigSource
enum FIRRemoteConfigSource : NSInteger {}Enumerated value that indicates the source of Remote Config data. Data can come from the Remote Config service, the DefaultConfig that is available when the app is first installed, or a static initialized value if data is not available from the service or DefaultConfig.
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                  < The data source is the Remote Config service. DeclarationObjective-C FIRRemoteConfigSourceRemote
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                  < The data source is the DefaultConfig defined for this app. DeclarationObjective-C FIRRemoteConfigSourceDefault
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                  < The data doesn’t exist, return a static initialized value. DeclarationObjective-C FIRRemoteConfigSourceStatic