import { computed } from 'vue';

function useMenu(instance, currentIndex) {
  const indexPath = computed(() => {
    let parent = instance.parent;
    const path = [currentIndex.value];
    while (parent.type.name !== "ElMenu") {
      if (parent.props.index) {
        path.unshift(parent.props.index);
      }
      parent = parent.parent;
    }
    return path;
  });
  const parentMenu = computed(() => {
    let parent = instance.parent;
    while (parent && !["ElMenu", "ElSubMenu"].includes(parent.type.name)) {
      parent = parent.parent;
    }
    return parent;
  });
  return {
    parentMenu,
    indexPath
  };
}

export { useMenu as default };
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