method Socket.prototype.ref
Usage in Deno
```typescript import { Socket } from "node:node__dgram.d.ts"; ```
Socket.prototype.ref(): this
By default, binding a socket will cause it to block the Node.js process from
exiting as long as the socket is open. The `socket.unref()` method can be used
to exclude the socket from the reference counting that keeps the Node.js
process active. The `socket.ref()` method adds the socket back to the reference
counting and restores the default behavior.
Calling `socket.ref()` multiples times will have no additional effect.
The `socket.ref()` method returns a reference to the socket so calls can be
chained.
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