RetainedPropsRoot.re

let toggle = ref(false);

let render = () => {
  toggle := ! toggle.contents;
  ReactDOMRe.renderToElementWithId(
    <RetainedPropsExample message=(toggle.contents ? "Hello!" : "Goodbye") />,
    "index"
  )
};

Js.Global.setInterval(render, 1000);

/* render once first! */
render();