public-fuse/src/core/utils/utils.js

export function dataURItoBlob(dataURI) {
  // convert base64 to raw binary data held in a string
  // doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
  var byteString = atob(dataURI.split(",")[1]);

  // separate out the mime component
  var mimeString = dataURI.split(",")[0].split(":")[1].split(";")[0];

  // write the bytes of the string to an ArrayBuffer
  var ab = new ArrayBuffer(byteString.length);

  // create a view into the buffer
  var ia = new Uint8Array(ab);

  // set the bytes of the buffer to the correct values
  for (var i = 0; i < byteString.length; i++) {
    ia[i] = byteString.charCodeAt(i);
  }

  // write the ArrayBuffer to a blob, and you're done
  var blob = new Blob([ab], { type: mimeString });
  return blob;
}

export const saveFile = function (strData, filename) {
  var link = document.createElement("a");
  if (typeof link.download === "string") {
    document.body.appendChild(link); //Firefox requires the link to be in the body
    link.download = filename;
    link.href = strData;
    link.click();
    document.body.removeChild(link); //remove the link when done
  } else {
    location.replace(uri);
  }
};