---
id: fast-foundation.islistboxoption
title: isListboxOption() function
hide_title: true
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[@microsoft/fast-foundation](./fast-foundation.md) &gt; [isListboxOption](./fast-foundation.islistboxoption.md)

## isListboxOption() function

Determines if the element is a [ListboxOption](./fast-foundation.listboxoption.md)

<b>Signature:</b>

```typescript
export declare function isListboxOption(el: Element): el is ListboxOption;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  el | Element |  |

<b>Returns:</b>

el is [ListboxOption](./fast-foundation.listboxoption.md)
