extendscript. how to save artlayer as png - extendscript

Question

How can i save a ArtLayer as a png file? Are there any Action APIs I can use?
var layer = activeDocument.layers[2];
layer.copy();
var myDoc = app.documents.add(2000, 1000, 72, 'export-demo');
myDoc.paste();
var type = new PNGSaveOptions();
var fileSpec = new File("e:/ps/" + layer.name + ".png");
myDoc.saveAs(fileSpec, type);

Answer 1

Please note: I don't have the rep to comment and ask for more details. So I figured that I would just post the answer that I know.
There would be a few ways to accomplish this. But the easiest way that I've found to do this is to turn off the visibility of all other layers, then export a PNG. This would look something like this:
#target photoshop
var activeDoc = app.activeDocument;
var layers = activeDoc.layers;
var focusLayer = layers[ 2 ];
var visibleLayers = [];
for ( var i = 0; i < layers.length; i++ ) {
// Add visible layers to array so they can be turned back on after export
if ( layers[ i ].visible ) visibleLayers.push( layers[ i ] );
// Turn off visibility of all layers except the focus layer
if ( layers[ i ] !== focusLayer ) layers[ i ].visible = false;
}
// Export PNG * Change options to your liking
var filepath = "e:/ps/" + layer.name + ".png";
var file = File( filepath );
var exportOptions = new ExportOptionsSaveForWeb();
exportOptions.format = SaveDocumentType.PNG;
exportOptions.PNG8 = false; // false = PNG-24
exportOptions.transparency = true; // true = transparent
exportOptions.interlaced = false; // true = interlacing on
exportOptions.includeProfile = false; // false = don't embedd ICC profile
activeDoc.exportDocument(file, ExportType.SAVEFORWEB, exportOptions);
// Turn visible layers back on
for ( var i = 0; i < visibleLayers.length; i++ ) {
visibleLayers[ i ].visible = true;
}
The downside to this method is that it only exports to the size of the PSD and does not crop to the layer image dimensions.