---
category: Reactivity
---

# refDefault

Apply default value to a ref.

## Usage

```ts
import { refDefault, useStorage } from '@vueuse/core';

const raw = useStorage('key');
const state = refDefault(raw, 'default');

raw.value = 'hello';
console.log(state.value); // hello

raw.value = undefined;
console.log(state.value); // default
```

## Type Declarations

```ts
/**
 * Apply default value to a ref.
 *
 * @__NO_SIDE_EFFECTS__
 */
export declare function refDefault<T>(source: Ref<T | undefined | null>, defaultValue: T): Ref<T>;
```
