---
id: fast-foundation.mediaquerylistlistener
title: MediaQueryListListener type
hide_title: true
---
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[@microsoft/fast-foundation](./fast-foundation.md) &gt; [MediaQueryListListener](./fast-foundation.mediaquerylistlistener.md)

## MediaQueryListListener type

An event listener fired by a [MediaQueryList](https://developer.mozilla.org/en-US/docs/Web/API/MediaQueryList)<!-- -->.

<b>Signature:</b>

```typescript
export declare type MediaQueryListListener = (this: MediaQueryList, ev?: MediaQueryListEvent) => void;
```