```typescript
import { ftruncateSync } from "node:node__fs.d.ts";
```
ftruncateSync(
fd: number,
len?: number | null,
): void
Truncates the file descriptor. Returns `undefined`.
For detailed information, see the documentation of the asynchronous version of
this API: [ftruncate](../.././node__fs.d.ts/~/ftruncate).