---
id: fast-element.attachedbehaviortype
title: AttachedBehaviorType type
hide_title: true
---
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[@microsoft/fast-element](./fast-element.md) &gt; [AttachedBehaviorType](./fast-element.attachedbehaviortype.md)

## AttachedBehaviorType type

Describes the shape of a behavior constructor that can be created by an [AttachedBehaviorHTMLDirective](./fast-element.attachedbehaviorhtmldirective.md)<!-- -->.

<b>Signature:</b>

```typescript
export declare type AttachedBehaviorType<T = any> = new (target: any, options: T) => Behavior;
```