> ## Documentation Index
> Fetch the complete documentation index at: https://docs.qu.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# ProgressCallback

```ts theme={null}
type ProgressCallback: (percent) => void;
```

A callback during long-running operations to update any UI or provide programatic access to the progress.

The `percent` is a value between `0` and `1`.

## Parameters

| Parameter | Type     |
| :-------- | :------- |
| `percent` | `number` |

## Returns

`void`

## Source

[crypto/scrypt.ts:14](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/crypto/scrypt.ts#L14)