download.js

const download = (fileName, data) => {
  const blob = new Blob([data]);
  const url = window.URL.createObjectURL(blob);
  const a = document.createElement("a");  
  a.href = url;
  a.download = fileName;
  a.style = "display: none";
  document.body.appendChild(a);
  a.click();
  a.remove();
  window.URL.revokeObjectURL(url);
};