text: export default function b64toBlob (b64Data, contentType, sliceSize) {
      contentType = contentType || '';
      sliceSize = sliceSize || 512;
  
      var byteCharacters = atob(b64Data);
      
      var byteArrays = [];
  
      for (var offset = 0; offset < byteCharacters.length; offset += sliceSize) {
          var slice = byteCharacters.slice(offset, offset + sliceSize);
  
          var byteNumbers = new Array(slice.length);
          for (var i = 0; i < slice.length; i++) {
              byteNumbers[i] = slice.charCodeAt(i);
          }
  
          var byteArray = new Uint8Array(byteNumbers);
  
          byteArrays.push(byteArray);
      }
  
    var blob = new Blob(byteArrays, {type: contentType});
    return blob;
  }