Keys for Items Accessed in JavaScript Code Keys in property list items that the system recieves from or sends to JavaScript code. TopicsConstantsNSExtensionJavaScriptPreprocessingResultsKeyNSExtensionJavaScriptFinalizeArgumentKey See AlsoConstantsNSItemProvider.CompletionHandlerNSItemProvider.LoadHandlerOptions Dictionary KeyerrorDomainNSItemProviderFileOptionsNSItemProviderReadingNSItemProviderWritingNSItemProviderRepresentationVisibilityNSItemProvider.ErrorCode