code: function() {
      var url, err;
      try {
        throw new _Error();
      } catch (e) {
        err = e;
      }
      if (err) {
        url = err.sourceURL || err.fileName || _getCurrentScriptUrlFromErrorStack(err.stack);
      }
      return url;
    }
docs: Get the current script's URL by throwing an `Error` and analyzing it.
  
  @returns String or `undefined`
  @private