text: 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]);
  }
  //# sourceMappingURL=useOnRouteFocus.js.map