invokeai/frontend/web/src/features/controlLayers/hooks/useEntityIsEmpty.ts

import { useAppSelector } from 'app/store/storeHooks';
import { buildSelectHasObjects } from 'features/controlLayers/store/selectors';
import type { CanvasEntityIdentifier } from 'features/controlLayers/store/types';
import { useMemo } from 'react';

export const useEntityIsEmpty = (entityIdentifier: CanvasEntityIdentifier | null) => {
  const selectHasObjects = useMemo(
    () => (entityIdentifier ? buildSelectHasObjects(entityIdentifier) : () => false),
    [entityIdentifier]
  );
  const hasObjects = useAppSelector(selectHasObjects);

  return !hasObjects;
};