---
title: extensionOutput
framework: authenticationservices
role: symbol
role_heading: Instance Property
path: authenticationservices/aspasskeyassertioncredential/extensionoutput-7t6rn
---

# extensionOutput

An output from WebAuthn extensions.

## Declaration

```swift
var extensionOutput: ASPasskeyAssertionCredentialExtensionOutput? { get set }
```

## See Also

### Accessing extension output

- [ASPasskeyAssertionCredentialExtensionOutput](authenticationservices/aspasskeyassertioncredentialextensionoutput-swift.struct.md)