@react-navigation/core/lib/module/useOnRouteFocus.js

import * as React from 'react';
import NavigationBuilderContext from './NavigationBuilderContext';

/**
 * Hook to handle focus actions for a route.
 * Focus action needs to be treated specially, coz when a nested route is focused,
 * the parent navigators also needs to be focused.
 */
export default function useOnRouteFocus(_ref) {
  let {
    router,
    getState,
    key: sourceRouteKey,
    setState
  } = _ref;
  const {
    onRouteFocus: onRouteFocusParent
  } = React.useContext(NavigationBuilderContext);
  return React.useCallback(key => {
    const state = getState();
    const result = router.getStateForRouteFocus(state, key);

    if (result !== state) {
      setState(result);
    }

    if (onRouteFocusParent !== undefined && sourceRouteKey !== undefined) {
      onRouteFocusParent(sourceRouteKey);
    }
  }, [getState, onRouteFocusParent, router, setState, sourceRouteKey]);
}
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