Open print dialogue.

blobToPrint.js

 const displayPrintDialogue = (generatedBlob) => {  // generate blob
    var blob = new Blob([generatedBlob], { type: "application/pdf" }); 

    var blobURL = URL.createObjectURL(blob);

    let iframe = document.createElement("iframe"); //load content in an iframe to print later
    document.body.appendChild(iframe);

    iframe.style.display = "none";
    iframe.src = blobURL;
    iframe.onload = function () {
      setTimeout(function () {
        iframe.focus();
        iframe.contentWindow.print();
      }, 1);
    };
  };