@class NSString; @interface STYDeviceInfo : NSObject @property (class, readonly) unsigned long long bootVolumeType; @property (class, readonly) NSString *hardwareModel; @property (class, readonly) NSString *osBuild; @property (class, readonly) BOOL isAppleInternal; @property (class, readonly) BOOL isMemoryConstrained; + (unsigned long long)_determineBootVolumeType; + (id)_determineHardwareModel; @end