docs: function wrap(stream) {
    stream.on('error', error => {
      gutil.log(gutil.colors.red(error.message));
      gutil.log(error.stack);
      if (watching) {
        gutil.log(gutil.colors.yellow('[aborting]'));
        stream.end();
      } else {
        gutil.log(gutil.colors.yellow('[exiting]'));
        process.exit(1);
      }
      ringBell();
    });
    return stream;
  }