Deno.Listener no exposing port

[aricart]

To extract the port from a random port in a Deno.listen is somewhat painful:

    const listener = Deno.listen({ port: 0, transport: "tcp" });
    //@ts-ignore
    const {port} = listener.addr
    this.port = port

While the random port doesn't seem that useful, it is extremely. For unit tests, launching a listener or process at a random port means that unit tests can really be independent, and not hardcoded.

[SyrupThinker]

Your error is basically a duplicate of #5102, check this comment.