---
layout: docs
title: addBeforeTypes
id: class.Facebook.HackCodegen.CodegenFile.addBeforeTypes
docid: class.Facebook.HackCodegen.CodegenFile.addBeforeTypes
permalink: /docs/reference/class.Facebook.HackCodegen.CodegenFile.addBeforeTypes/
---
# Facebook\\HackCodegen\\CodegenFile::addBeforeTypes()




``` Hack
public function addBeforeTypes(
  Traversable<Facebook\HackCodegen\CodegenType> $types,
): this;
```




## Parameters




- ` Traversable<Facebook\HackCodegen\CodegenType> $types `




## Returns




+ ` this `