@interface _EXExtensionAvailablility : NSObject <NSSecureCoding> @property (class, readonly) BOOL supportsSecureCoding; @property long long enabledCount; @property long long disabledCount; @property long long unelectedCount; + (id)addChangeObserver:(id /* block */)a0; + (void)removeChangeObserver:(id)a0; - (void)encodeWithCoder:(id)a0; - (id)initWithCoder:(id)a0; @end