method FSWatcher.unref
Usage in Deno
```typescript import { type FSWatcher } from "node:node__fs.d.ts"; ```
FSWatcher.unref(): this
When called, the active `fs.FSWatcher` object will not require the Node.js
event loop to remain active. If there is no other activity keeping the
event loop running, the process may exit before the `fs.FSWatcher` object's
callback is invoked. Calling `watcher.unref()` multiple times will have
no effect.
this