---
url: /api/reference/wxt/utils/storage/type-aliases/WatchCallback.md
---

[API](../../../../packages.md) / [wxt/utils/storage](../index.md) / WatchCallback

# Type Alias: WatchCallback\<T>

> **WatchCallback**<`T`> = (`newValue`, `oldValue`) => `void`

Source: packages/storage/dist/index.d.mts:248

Callback called when a value in storage is changed.

## Type Parameters

### T

`T`

## Parameters

### newValue

`T`

### oldValue

`T`

## Returns

`void`

***

Generated using [typedoc-plugin-markdown](https://www.npmjs.com/package/typedoc-plugin-markdown) and [TypeDoc](https://typedoc.org/)