commandDescription(withAppleEventClass:andAppleEventCode:)
Returns the command description identified by a suite’s four-character Apple event code of the class (eventClass) and the four-character Apple event code of the command (commandCode).
Declaration
func commandDescription(withAppleEventClass appleEventClassCode: FourCharCode, andAppleEventCode appleEventIDCode: FourCharCode) -> NSScriptCommandDescription?