docs: function checkHeaderFromStream(file, ctx) {
  		file.contents.pipe(es.wait(function (err, data) {
  			if (err) {
  				throw err;
  			}
  
  			var bufferFile = new File({
  				path: file.path,
  				contents: data
  			});
  
  			checkHeaderFromBuffer(bufferFile, ctx);
  		}));
  	}