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# Keys for Items Accessed in JavaScript Code

Keys in property list items that the system recieves from or sends to JavaScript code.

## Topics

### Constants

[`let NSExtensionJavaScriptPreprocessingResultsKey: String`](/documentation/Foundation/NSExtensionJavaScriptPreprocessingResultsKey)

A key whose value is an item of type `kUTTypePropertyList`. The item contains an `NSDictionary` that contains the object returned by the JavaScript code to its completion function.

[`let NSExtensionJavaScriptFinalizeArgumentKey: String`](/documentation/Foundation/NSExtensionJavaScriptFinalizeArgumentKey)

A key whose value is an item of type `kUTTypePropertyList`. The item contains an `NSDictionary` that contains the arguments to be passed to a JavaScript finalize method.


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