@livelybone/use-mounted/lib/es/index.js

React hook for mounted and unmount, return an object: MutableRefObject<{ mounted: boolean, unmounted: boolean }>

/**
 * Bundle of @livelybone/use-mounted
 * Generated: 2020-07-15
 * Version: 1.0.5
 * License: MIT
 * Author: 2631541504@qq.com
 */

import { useRef, useEffect } from 'react';

function useMounted(mountedFn) {
  var fn = useRef(mountedFn);
  fn.current = mountedFn;
  var state = useRef({
    mounted: false,
    unmounted: false
  });
  useEffect(function () {
    state.current.mounted = true;
    state.current.unmounted = false;
    var unmountedFn = fn.current && fn.current();
    return function () {
      if (typeof unmountedFn === 'function') unmountedFn();
      state.current.unmounted = true;
    };
  }, []);
  return state;
}

export default useMounted;