function fsync
Usage in Deno
```typescript import { fsync } from "node:node__fs.d.ts"; ```
fsync(fd: number,callback: NoParamCallback,): 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. No arguments other
than a possible exception are given to the completion callback.
callback: NoParamCallback
void