Module

std/node/net.ts>Server#ref

Deno standard library
denoland/deno_std
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method Server.prototype.ref
import { Server } from "https://dotland.deno.dev/std@0.177.0/node/net.ts";

Opposite of unref(), calling ref() on a previously unrefed server will not let the program exit if it's the only server left (the default behavior). If the server is refed calling ref() again will have no effect.