# $interval

## Import

```typescript
import { $interval } from "alepha/datetime";
```

## Overview

Run a function periodically.
It uses the `setInterval` internally.
It starts by default when the context starts and stops when the context stops.

## Options

| Option     | Type           | Required | Description            |
| ---------- | -------------- | -------- | ---------------------- |
| `handler`  | `Object`       | Yes      | The interval handler.  |
| `duration` | `DurationLike` | Yes      | The interval duration. |