Saving an image as TGA with transparency

The answer appears to have become irrelevant in the last 12 years, anyone no how to do this in 2023? The option to select an alpha layer while trying to save as a .tga is greyed out. I'm lost.

This jsx script for save all visible in TGA, with transparency:

#target photoshop



cTID = function(s) { return app.charIDToTypeID(s); };
sTID = function(s) { return app.stringIDToTypeID(s); };
var doc = app.activeDocument;
var filename = doc.name;
var filepath = doc.path;
filename = filename.slice(0, filename.lastIndexOf("."));
var file = new File(filepath +"/" + filename + ".tga");
//------------------------------------------- Duplicate file
var duppedDocument = app.activeDocument.duplicate();
app.activeDocument = duppedDocument;


//-------- Выбираем видимый слой, иначе мердж не работает, и обьединяем видимое
if (1 < duppedDocument.layers.length) {
	for (var j = 0; j < duppedDocument.layers.length; j++) {
		if (duppedDocument.layers[j].visible){
			duppedDocument.activeLayer = duppedDocument.layers[j]
			j = duppedDocument.layers.length;
		  }
		}
	duppedDocument.mergeVisibleLayers();
}

makeAlpha_from_Transparancy();

function makeAlpha_from_Transparancy()
{
	//Выделение прозрачного
  var id4556 = charIDToTypeID( "setd" );
  var desc983 = new ActionDescriptor();
  var id4557 = charIDToTypeID( "null" );
  var ref657 = new ActionReference();
  var id4558 = charIDToTypeID( "Chnl" );
  var id4559 = charIDToTypeID( "fsel" );
  ref657.putProperty( id4558, id4559 );
  desc983.putReference( id4557, ref657 );
  var id4560 = charIDToTypeID( "T   " );
  var ref658 = new ActionReference();
  var id4561 = charIDToTypeID( "Chnl" );
  var id4562 = charIDToTypeID( "Chnl" );
  var id4563 = charIDToTypeID( "Trsp" );
  ref658.putEnumerated( id4561, id4562, id4563 );
  desc983.putReference( id4560, ref658 );
  executeAction( id4556, desc983, DialogModes.NO );


  //Сохраняем выделение в новый канал
  var id4564 = charIDToTypeID( "Mk  " );
  var desc984 = new ActionDescriptor();
  var id4565 = charIDToTypeID( "Nw  " );
  var id4566 = charIDToTypeID( "Chnl" );
  desc984.putClass( id4565, id4566 );
  var id4567 = charIDToTypeID( "At  " );
  var ref659 = new ActionReference();
  var id4568 = charIDToTypeID( "Chnl" );
  var id4569 = charIDToTypeID( "Chnl" );
  var id4570 = charIDToTypeID( "New " );
  ref659.putEnumerated( id4568, id4569, id4570 );
  desc984.putReference( id4567, ref659 );
  var id4571 = charIDToTypeID( "Usng" );
  var id4572 = charIDToTypeID( "UsrM" );
  var id4573 = charIDToTypeID( "RvlS" );
  desc984.putEnumerated( id4571, id4572, id4573 );
  executeAction( id4564, desc984, DialogModes.NO );


  var CH =duppedDocument.channels[3];
  duppedDocument.selection.store(CH,SelectionType.REPLACE);
}




function Save_as_TGA() {
  function step1(enabled, withDialog) {
	if (enabled != undefined && !enabled)
	  return;
	var dialogMode = (withDialog ? DialogModes.ALL : DialogModes.NO);
	var desc1 = new ActionDescriptor();
	desc1.putInteger(cTID('Dpth'), 8);
	var desc2 = new ActionDescriptor();
	desc2.putInteger(cTID('Vrsn'), 6);
	desc2.putEnumerated(cTID('Mthd'), sTID("hdrToningMethodType"), sTID("hdrtype2"));
	desc2.putDouble(cTID('Exps'), 0);
	desc2.putDouble(cTID('Gmm '), 1);
	desc2.putBoolean(sTID("deghosting"), false);
	desc1.putObject(cTID('With'), sTID("hdrOptions"), desc2);
	executeAction(sTID('convertMode'), desc1, dialogMode);
  };

  function step4(enabled, withDialog) {
	if (enabled != undefined && !enabled)
	  return;
	var dialogMode = (withDialog ? DialogModes.ALL : DialogModes.NO);
	var desc1 = new ActionDescriptor();
	var desc2 = new ActionDescriptor();
	desc2.putInteger(cTID('BtDp'), 32);
	desc2.putInteger(cTID('Cmpr'), 1); //RLE Compression
	desc1.putObject(cTID('As  '), cTID('TrgF'), desc2);
	desc1.putPath(cTID('In  '), new File(file));
	desc1.putInteger(cTID('DocI'), 223);
	executeAction(sTID('save'), desc1, dialogMode);
  };

  step1(true,0);      //
  step4();      //
};



//=========================================
//                    Save_as_TGA.main
//=========================================
//

Save_as_TGA.main = function () {
  Save_as_TGA();
};

Save_as_TGA.main();
duppedDocument.close(SaveOptions.DONOTSAVECHANGES);
app.activeDocument = doc;

reowner1 wrote: ...When I save it as PNG transparency shows...

So what is wrong with PNG?

Because so many people using TGA don't understand transparency and alpha -- we only read and write TGA with alpha channels.

(we tried it with transparency, and half the video industry got confused)