(function () {
  if (window.QRCodeStyling) {
    return;
  }

  var request = new XMLHttpRequest();
  request.open('GET', '/assets/vendor/qr-code-styling/qr-code-styling.js', false);
  request.send(null);

  if (request.status < 200 || request.status >= 300) {
    throw new Error('Failed to load QR code styling library.');
  }

  var source = String(request.responseText || '');
  var initialize = new Function(source + '\nreturn typeof QRCodeStyling !== \'undefined\' ? QRCodeStyling : window.QRCodeStyling;');
  var exported = initialize.call(window);

  if (exported && !window.QRCodeStyling) {
    window.QRCodeStyling = exported;
  }
}());