method Timeout.prototype.unref
Usage in Deno
```typescript import { Timeout } from "node:node__timers.d.ts"; ```
Timeout.prototype.unref(): this
When called, the active `Timeout` 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 `Timeout` object's callback is invoked. Calling `timeout.unref()` multiple times will have no effect.
this
a reference to `timeout`