@fgv/ts-web-extras
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Browser-compatible utilities and FileTree implementations
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[Home](./index.md) > [@fgv/ts-web-extras](./ts-web-extras.md) > [FileSystemWritableFileStream\_2](./ts-web-extras.filesystemwritablefilestream_2.md) > [truncate](./ts-web-extras.filesystemwritablefilestream_2.truncate.md)
## FileSystemWritableFileStream\_2.truncate() method
**Signature:**
```typescript
truncate(size: number): Promise<void>;
```
## Parameters
<table><thead><tr><th>
Parameter
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td>
size
</td><td>
number
</td><td>
</td></tr>
</tbody></table>
**Returns:**
Promise<void>