Convert base64/URLEncoded data to raw binary data | Javascript

dataURItoBlob.js

export default function dataURItoBlob(dataURI) {
 
  var BASE64_MARKER = ';base64,';
  var parts;
  var contentType;
  var raw;
  
    if (dataURI.indexOf(BASE64_MARKER) === -1) {
        parts = dataURI.split(',');
        contentType = parts[0].split(':')[1];
        raw = decodeURIComponent(parts[1]);
        return new Blob([raw], { type: contentType });
    } else {
      parts = dataURI.split(BASE64_MARKER);
      contentType = parts[0].split(':')[1];
      raw = window.atob(parts[1]);
      var rawLength = raw.length;

      var uInt8Array = new Uint8Array(rawLength);

      for (var i = 0; i < rawLength; ++i) {
        uInt8Array[i] = raw.charCodeAt(i);
      }

      return new Blob([uInt8Array], { type: contentType });
    }
    
}