Replace layer image

[HediMlika]

I have two layers and I want to replace the second layer's image and save the output as PNG

{ children:
   [ { type: 'layer',
       visible: true,
       opacity: 1,
       blendingMode: 'normal',
       name: 'Layer 1',
       left: 0,
       right: 0,
       top: 0,
       bottom: 0,
       height: 0,
       width: 0,
       mask: [Object],
       text: undefined,
       image: {} },
     { type: 'layer',
       visible: true,
       opacity: 1,
       blendingMode: 'normal',
       name: 'Layer 2',
       left: 0,
       right: 1000,
       top: 0,
       bottom: 665,
       height: 665,
       width: 1000,
       mask: {},
       text: undefined,
       image: {} } ],
  document:
   { width: 1000,
     height: 665,
     resources: { layerComps: [], guides: [], slices: [] } } }

I have tried doing it this way but the image is not being replaced.

const PSD = require("psd");
const fs = require("fs");

fs.readFile("new_image.png", (err, data) => {
    if (err) throw err;
    let new_buffer = data;
    let psd = PSD.fromFile("./file.psd");
    psd.parse();
    psd.tree().descendants()[1].layer.file.data = new_buffer;
    png = psd.image.toPng();
    psd.image.saveAsPng('out.png').then(() => console.log('Exported!'));
});

[gamegee]

Hi @HediMlika the purpose of this project is only to parse psd files. So unfortunately you can't update the psd tree.
The idea of updating a PSD file through JS is really cool, but it probably need a lot of work.