---
layout: docs
title: getFileHeader
id: interface.Facebook.HackCodegen.IHackCodegenConfig.getFileHeader
docid: interface.Facebook.HackCodegen.IHackCodegenConfig.getFileHeader
permalink: /docs/reference/interface.Facebook.HackCodegen.IHackCodegenConfig.getFileHeader/
---
# Facebook\\HackCodegen\\IHackCodegenConfig::getFileHeader()




``` Hack
public function getFileHeader(): ?Traversable<string>;
```




## Returns




* ` ?Traversable<string> `