# rollup.close

Releases the rollup device. After closing, every method on the instance throws; create a new [`Rollup`](/cmio/reference/rollup) to start again.

Because the device is exclusive (one open instance at a time), `close` is what lets a process — typically a test suite — open the device more than once.

## Usage

```ts twoslash
import { Rollup } from '@deroll/cmio';
// ---cut---
const first = new Rollup();
// ... use it ...
first.close();

const second = new Rollup(); // would throw -EBUSY without the close() above
```

## Returns

`void`

## Errors

| Condition | Error |
| --- | --- |
| Methods called after `close` | `Error` |