code: function getFileSize(path) {
  	return new Promise(function(resolve, reject) {
  		fs.stat(path, function(err, stats) {
  			if (err) {
  				if (err.code === 'ENOENT') {
  					resolve(null);
  				} else {
  					reject(err);
  				}
  				return;
  			}
  
  			resolve(stats.size);
  		});
  	});
  }
docs: ------------------------------------------------------------------------------ File handlers ------------------------------------------------------------------------------ @private