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

## Binding type

The signature of an arrow function capable of being evaluated as part of a template binding update.

<b>Signature:</b>

```typescript
export declare type Binding<TSource = any, TReturn = any, TParent = any> = (source: TSource, context: ExecutionContext<TParent>) => TReturn;
```