code: function html2pdf(src, opt) {
    // Create a new worker with the given options.
    var worker = new html2pdf.Worker(opt);
  
    if (src) {
      // If src is specified, perform the traditional 'simple' operation.
      return worker.from(src).save();
    } else {
      // Otherwise, return the worker for new Promise-based operation.
      return worker;
    }
  }
docs: Generate a PDF from an HTML element or string using html2canvas and jsPDF.
  
  @param {Element|string} source The source element or HTML string.
  @param {Object=} opt An object of optional settings: 'margin', 'filename',
  'image' ('type' and 'quality'), and 'html2canvas' / 'jspdf', which are
  sent as settings to their corresponding functions.