code: function wrap(str, lineLength) {
      str = (str || '').toString();
      lineLength = lineLength || 76;
  
      if (str.length <= lineLength) {
          return str;
      }
  
      let result = [];
      let pos = 0;
      let chunkLength = lineLength * 1024;
      while (pos < str.length) {
          let wrappedLines = str
              .substr(pos, chunkLength)
              .replace(new RegExp('.{' + lineLength + '}', 'g'), '$&\r\n')
              .trim();
          result.push(wrappedLines);
          pos += chunkLength;
      }
  
      return result.join('\r\n').trim();
  }
docs: Adds soft line breaks to a base64 string
  
  @param {String} str base64 encoded string that might need line wrapping
  @param {Number} [lineLength=76] Maximum allowed length for a line
  @returns {String} Soft-wrapped base64 encoded string