Function listen

listen(transport, host, port?, options?): Promise<Listener | DatagramEndpoint>
Listens for incoming connections on the selected transport.
Parameters
- transport: Transport
  Transport type.
- host: string
  Hostname for listening on.
- Optionalport: string | number
  Listening port (where applicable).
- Optionaloptions: ListenOptions
  Extra listen options.
Returns Promise<Listener | DatagramEndpoint>