print_image_as_pdf.js

      import jsPdf from 'jspdf';

      domToPng(ticketElement).then(dataUrl => {
        const pdf = new jsPdf();

        const imgProps = pdf.getImageProperties(dataUrl);

        const pdfWidth = pdf.internal.pageSize.getWidth();
        // const pdfHeight = pdf.internal.pageSize.getHeight();

        const imgWidth = (imgProps.width * (25.4 / 96))
        const imgHeight = (imgProps.height * (25.4/ 96))
        
        const x_axis = (pdfWidth * 0.5) - (imgWidth * 0.5)
        const y_axis = 0

        pdf.addImage(dataUrl, 'PNG', x_axis, y_axis, imgWidth, imgHeight);

        pdf.save('ticket.pdf');
      })