method Server.prototype.close
Usage in Deno
```typescript import { Server } from "node:node__net.d.ts"; ```
Server.prototype.close(callback?: (err?: Error) => void): this
Stops the server from accepting new connections and keeps existing
connections. This function is asynchronous, the server is finally closed
when all connections are ended and the server emits a `'close'` event.
The optional `callback` will be called once the `'close'` event occurs. Unlike
that event, it will be called with an `Error` as its only argument if the server
was not open when it was closed.
this