# `GSDocument documentTypeFromExtension:`

*Type Method*

## Declaration

```swift
class func documentType(fromExtension extension: GSDocumentExtension) -> GSDocumentType?
```

```objc
+ (GSDocumentType) documentTypeFromExtension:(GSDocumentExtension) extension;
```

```python
documentTypeFromExtension_(extension: GSDocumentExtension) -> GSDocumentType
```