useUnmounted

function useUnmounted(): NonNullRef<boolean>;

import { useUnmounted } from "@react-md/core";
import { useEffect, useState } from "react";

function Example(): ReactElement {
  const [state, setState] = useState({ loading: false });
  const unmounted = useUnmounted();

  useEffect(() => {
    async function load(): void {
      const result = await fetch("/some-api");
      const json = await response.json();
      if (!unmounted.current) {
        setState({ loading: false, result: json });
      }
    }

    setState({ loading: true });
    load();
  }, [unmounted]);

  return null;
}