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




``` Hack
protected static function preprocess(
  string $file_data,
): string;
```




## Parameters




- ` string $file_data `




## Returns




+ ` string `