How to save a layer to a PNG

[velara3]

I'm trying to save a layer to a PNG and it writes the file but they don't appear to be viewable:

 for (var i=0;i<layers.length;i++) {
           var outputPath = "./uploads/layer.png";
           var file = node.toPng(outputPath);
           
           fs.writeFile(outputPath, file.data, function (err) {
              console.log("layer " + layerData.index + " saved");
           });
 }

[RocketierYashank]

Not sure if this is still relevant but was able to achieve this using the following code.

var PSD = require('psd');
var start = new Date();
PSD.open('testing.psd').then(function (psd) {
  psd.tree().descendants().forEach(function (node) {
    if (node.isGroup()) return true;
    node.saveAsPng(node.name + ".png").catch(function (err) {
      console.log(err.stack);
    });
  });
}).then(function () {
  console.log("Finished in " + ((new Date()) - start) + "ms");
}).catch(function (err) {
  console.log('ERROR:', err.stack);
});