@kiwicom/orbit-components/es/hooks/useIsMounted/index.js

Orbit-components is a React component library which provides developers with the easiest possible way of building Kiwi.com’s products.

import { useCallback, useEffect, useRef } from "react"; // https://usehooks-typescript.com/react-hook/use-is-mounted

function useIsMounted() {
  var isMounted = useRef(false);
  useEffect(function () {
    isMounted.current = true;
    return function () {
      isMounted.current = false;
    };
  }, []);
  return useCallback(function () {
    return isMounted.current;
  }, []);
}

export default useIsMounted;