---
displayed_sidebar: jsClientSidebar
---

# Interface: UnderlyingSourceCancelCallback

[internal](../modules/internal-10.md).UnderlyingSourceCancelCallback

## Callable

### UnderlyingSourceCancelCallback

▸ **UnderlyingSourceCancelCallback**(`reason?`): `void` \| [`PromiseLike`](internal-8.PromiseLike.md)<`void`\>

#### Parameters

| Name | Type |
| :------ | :------ |
| `reason?` | `any` |

#### Returns

`void` \| [`PromiseLike`](internal-8.PromiseLike.md)<`void`\>

#### Defined in

docs-util/node_modules/typescript/lib/lib.dom.d.ts:26890