function fsyncSync
Usage in Deno
```typescript import { fsyncSync } from "node:node__fs.d.ts"; ```
fsyncSync(fd: number): void
Request that all data for the open file descriptor is flushed to the storage
device. The specific implementation is operating system and device specific.
Refer to the POSIX [`fsync(2)`](http://man7.org/linux/man-pages/man2/fsync.2.html) documentation for more detail. Returns `undefined`.
void