Export photoshop groups to different PNG files

export_script.js

#target photoshop
function main(){
if(!documents.length) return;
var doc = activeDocument;
var oldPath = activeDocument.path;
for(var a=0;a<doc.layerSets.length;a++){
activeDocument.activeLayer = activeDocument.layers.getByName(doc.layerSets[a].name);
dupLayers();
var saveFile= File(oldPath +"/"+doc.layerSets[a].name +".png");
SavePNG(saveFile);
app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);
    }
}
main();
function dupLayers() { 
    var desc143 = new ActionDescriptor();
        var ref73 = new ActionReference();
        ref73.putClass( charIDToTypeID('Dcmn') );
    desc143.putReference( charIDToTypeID('null'), ref73 );
    desc143.putString( charIDToTypeID('Nm  '), activeDocument.activeLayer.name );
        var ref74 = new ActionReference();
        ref74.putEnumerated( charIDToTypeID('Lyr '), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );
    desc143.putReference( charIDToTypeID('Usng'), ref74 );
    executeAction( charIDToTypeID('Mk  '), desc143, DialogModes.NO );
};
function SavePNG(saveFile){
    pngSaveOptions = new PNGSaveOptions(); 
    pngSaveOptions.embedColorProfile = true; 
    pngSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE; 
    pngSaveOptions.matte = MatteType.NONE; 
 pngSaveOptions.PNG8 = false;
    pngSaveOptions.transparency = true; 
activeDocument.saveAs(saveFile, pngSaveOptions, true, Extension.LOWERCASE); 
}