export default dataURI => {
  // convert base64/URLEncoded data component to raw binary data held in a string
  let byteString;
  if (dataURI.split(',')[0].indexOf('base64') >= 0)
    byteString = atob(dataURI.split(',')[1]);
  else byteString = unescape(dataURI.split(',')[1]);

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

  // write the bytes of the string to a typed array
  let ia = new Uint8Array(byteString.length);
  for (let i = 0; i < byteString.length; i++) {
    ia[i] = byteString.charCodeAt(i);
  }

  return new Blob([ia], { type: mimeString });
};