     
     private var realm: Realm
     private(set) var objectSchemas: [ObjectSchema] = []
-    private var filter: [String]? = nil
+    private var filter: [String]?
     private var tokenObjects: NotificationToken?
     private var tokenObject: NotificationToken?
-    
     
     init(realm: Realm, filter: [String]? = nil) {
         self.realm = realm

        return objectSchema.className
    }
    
    
    /// Fetch object schemas from realm.
    /// Optionally pass in an array of strings
    /// to filter out classes

        }
    }
}

// MARK: - Observing
extension BrowserEngine {
