1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
import { useCallback, useEffect, useRef } from "react";
/** * @returns {() => boolean} */export default function useMountedState() {  const mountedRef = useRef(false);  const get = useCallback(() => mountedRef.current, []);
  useEffect(() => {    mountedRef.current = true;
    return () => {      mountedRef.current = false;    };  }, []);
  return get;}