How to save clipboard image into local folder as jpeg in extendscript

So this is hacky at best but it works with images copied to your system clipboard. Tested with copying images from a website and from within the Preview app on a Mac. Screencast video shows the script in action.

// make a new document and paste the image
var doc = app.documents.add(DocumentColorSpace.RGB);
app.executeMenuCommand("paste");
var img = doc.pageItems[0];

// resize the artboard to match the image size
app.executeMenuCommand("Fit Artboard to artwork bounds");

// setup export file info
var fpath = Folder.desktop + "/EXAMPLE/"; // folder where JPEG will be saved
var fname = "imageExport.jpeg"; // name of saved JPEG
var f = new File(fpath + "/" + fname);

// export the file as a JPEG
var exportOptions, exportType;
exportOptions = new ExportOptionsJPEG();
exportOptions.qualitySetting = 100;
doc.exportFile(f, ExportType.JPEG, exportOptions);

I don't think you will be able to do this directly using Extendscript. You might have to use OS scripting i.e. Applescript on MAC and VBScript on WIN.

-Manan