code: function formatBufferColored(err, options) {
      // istanbul ignore else
      if (!hex) {
          return err.buffer.toString('hex');
      }
  
      options = options || {};
      var opts = options.hexerOptions ? Object.create(options.hexerOptions) : {};
      if (opts.colored === undefined) {
          opts.colored = true;
      }
      var highlight = errorHighlighter(err, options);
      opts.decorateHexen = highlight;
      opts.decorateHuman = highlight;
      return hex(err.buffer, opts);
  }
docs: istanbul ignore next TODO