dist/jspdf.node.debug.js
function putXObjectsDictCallback() {
    var images = this.internal.collections[namespace + 'images'],
        out = this.internal.write,
        image;

    for (var i in images) {
      image = images[i];
      out('/I' + image['i'], image['n'], '0', 'R');
    }
  }
function putXObjectsDictCallback() {
    var images = this.internal.collections[namespace + 'images'],
        out = this.internal.write,
        image;

    for (var i in images) {
      image = images[i];
      out('/I' + image['i'], image['n'], '0', 'R');
    }
  }
Image functionality ported from pdf.js