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# Interface: WritableStreamDefaultController

[internal](../modules/internal-8.md).WritableStreamDefaultController

This Streams API interface represents a controller allowing control of a
WritableStream's state. When constructing a WritableStream, the
underlying sink is given a corresponding WritableStreamDefaultController
instance to manipulate.

## Methods

### error

▸ **error**(`e?`): `void`

#### Parameters

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

#### Returns

`void`

#### Defined in

packages/medusa-js/node_modules/@types/node/stream/web.d.ts:247