import { Deno } from "https://deno.land/x/deno@v1.28.1/cli/dts/lib.deno.unstable.d.ts";
const { UnsafeCallback } = Deno;
Adds one to this callback's reference counting and returns the new reference count.
If the callback's reference count is non-zero, it will keep Deno's process from exiting.