Script to make landscape and portrait images square

Us the "Fit Image" option in photoshop - File - automate - Fit Image.

I have found this JaveScript that does what I need on the PC side, but keep getting an error when it tries to save the image. Is anyone able to recreate this into AppleScript with a correct save function... I am running a MAC, so I need an AppleScript. My coworker has Photoshop on the PC and is trying to use this JavaScript below.

//

//  resize canvas  & export JPG

//

#target photoshop

app.bringToFront();

// Save current dialog preferences

var startDisplayDialogs = app.displayDialogs;    

// Save current unit preferences

app.displayDialogs = DialogModes.NO

// Source and Destination Folders

var inputFolder = Folder.selectDialog("Select the Source folder");

var outputFolder = Folder.selectDialog("Select the Destination folder");

ProcessImages();

function ProcessImages() {

  var filesOpened = 0;

   if ( inputFolder == null || outputFolder == null) {

   if ( inputFolder == null) {

            alert("No Source folder selected");

      }

    if ( outputFolder == null) {

       alert("No Destination folder selected");

      }

   }else{

var fileList = inputFolder.getFiles();

  for ( var i = 0; i < fileList.length; i++ ) {

       if ( fileList instanceof File && ! fileList.hidden) {

                 open( fileList );

                 ResizeCanvas();

                 filesOpened++; 

         }

  }

  }

  return filesOpened;

}

function ExportJpeg(filePrefix, fileSuffix){

try

{

var docRef = app.activeDocument;

var docName = app.activeDocument.name.slice(0,-4);

var jpegOptions = new JPEGSaveOptions();

jpegOptions.quality = 8

docRef.flatten()

docRef.bitsPerChannel = BitsPerChannelType.EIGHT

jpegFile = new File( outputFolder + "//"  + filePrefix + docName + fileSuffix );

//Save Document As

docRef.saveAs(jpegFile, JPEGSaveOptions, true, Extension.LOWERCASE);

}

catch (e)

{

alert("Error when attempting to save the image. \r\r" + e);

return;

}

};

function ResizeCanvas()

{

   function CanvasSize() {

      var docRef = app.activeDocument;

      var docWidth = docRef.width.as("px");

      var docHeight = docRef.height.as("px");  

      if (docWidth < docHeight)

      {

            docRef.resizeCanvas(docWidth = docHeight, docWidth, AnchorPosition.MIDDLECENTER);

      }     

      else if (docWidth > docHeight)

      {

            docRef.resizeCanvas(docHeight = docWidth, docHeight, AnchorPosition.MIDDLECENTER);

      }

      else if (docWidth == docHeight)

      {

      }

};

var docRef = app.activeDocument;

var savedState = docRef.activeHistoryState;

CanvasSize();

app.displayDialogs = DialogModes.NO;

ExportJpeg("", ".jpg");

docRef.activeHistoryState = savedState;

docRef.close(SaveOptions.DONOTSAVECHANGES);

docRef = null;

}

// Reset preferences

app.displayDialogs = startDisplayDialogs;

alert("Operation Complete!" + "\n" + "Images were successfully exported to:" + "\n" + "\n" + outputFolder.toString().match(/([^\.]+)/)[1] + "/");