---
id: fast-element.notifier
title: Notifier interface
hide_title: true
---
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[@microsoft/fast-element](./fast-element.md) &gt; [Notifier](./fast-element.notifier.md)

## Notifier interface

Provides change notification for a source object.

<b>Signature:</b>

```typescript
export interface Notifier 
```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [source](./fast-element.notifier.source.md) | any | The source object that this notifier provides change notification for. |

## Methods

|  Method | Description |
|  --- | --- |
|  [notify(args)](./fast-element.notifier.notify.md) | Notifies all subscribers, based on the args. |
|  [subscribe(subscriber, propertyToWatch)](./fast-element.notifier.subscribe.md) | Subscribes to notification of changes in an object's state. |
|  [unsubscribe(subscriber, propertyToUnwatch)](./fast-element.notifier.unsubscribe.md) | Unsubscribes from notification of changes in an object's state. |
