@class NSObject, NSMutableOrderedSet; @protocol OS_dispatch_queue; @interface IMMessagesToTrack : NSObject @property (retain, nonatomic) NSMutableOrderedSet *recentMessageIDs; @property (retain, nonatomic) NSObject<OS_dispatch_queue> *internalQueue; @property (readonly, nonatomic) unsigned long long maxNumberOfMessages; @property (readonly, nonatomic) unsigned long long currentNumberOfMessages; + (id)sharedInstance; - (id)init; - (void).cxx_destruct; - (void)addMessagesID:(id)a0; - (void)containsMessageID:(id)a0 completion:(id /* block */)a1; @end