code: function browserReporter (file, errors) {
  	errors = errors || file.report.errors;
  	if (file.isStream()) {
  		file.contents = file.contents.pipe(new BufferStreams((err, buf, done) => {
  			if (err) {
  				done(err, buf);
  			} else {
  				done(null, appendReporter(file, errors, buf));
  			}
  		}));
  	} else if (file.isBuffer()) {
  		file.contents = appendReporter(file, errors);
  	}
  }
docs: 为Vinyl对象追加错误汇报内容
  @param  {Vinyl}  file     要处理的文件
  @param  {Array}  [errors] 错误信息
  @return {undefined}