code: function stat(file, cb) {
    utils.fileExists(file);
    utils.fs.stat(file.path, function(err, stat) {
      if (err) {
        file.stat = null;
        cb(err, file);
        return;
      }
      file.stat = stat;
      cb(null, file);
    });
  }
docs: Asynchronously add a `stat` property from `fs.stat` to the given file object.
  
  ```js
  var File = require('vinyl');
  var stats = require('{%= name %}');
  stats.stat(new File({path: 'README.md'}), function(err, file) {
  console.log(file.stat.isFile());
  //=> true
  });
  ```
  @name .stat
  @param {Object} `file` File object
  @param {Function} `cb`
  @api public