Return value `null` on first render

[smeijer]

The readme lists a portal example, with output:

import * as React from "react";
import * as ReactDOM from "react-dom";
import { useDisposable } from "use-disposable";

function Portal({ children }) {
  const domNode = useDisposable(() => {
    const newElement = document.createElement("div");
    document.body.appendChild(newElement);
    console.log("create DOM node");
    return [newElement, () => newElement.remove()];
  }, []);

  console.log("render to portal");
  return ReactDOM.createPortal(children, domNode);
}

The output

create DOM node
render to portal
render to portal

Yet when I run that code, the output is as below, domNode is null on the first render, and no portal is shown.

render to portal
create DOM node
render to portal

Reproduction here: https://stackblitz.com/edit/react-t1nu78?devToolsHeight=33&file=src%2FApp.js