vuex中的mapState辅助函数在vue3.x中的写法

如题,
例如在vue2.x中的:

computed: {
    ...mapState('tabBar', {
      isShow: (state) => state.isShow,
    }),
    //or: ...mapState('tabBar', ['isShow']),
  },

在vue3.x中改怎么写?
尝试过以下写法:

setup(){
    const isShow = computed(...mapState('tabBar', ['isShow']))
    
    return { isShow }
}

setup(){
    const isShow = computed(
      ...mapState('tabBar', {
        isShow: (state) => state.isShow,
      })
    
    return { isShow }
}

以上写法均报错:TypeError: Invalid attempt to spread non-iterable instance.
In order to be iterable, non-array objects must have a [Symbol.iterator]() method.

setup(){
    computed(
      mapState('tabBar', {
        isShow: (state) => state.isShow,
      })
    )
}

setup(){
    const isShow = computed(
      mapState('tabBar', {
        isShow: (state) => state.isShow,
      })
    )
}

以上写法报错:Property "isShow" was accessed during render but is not defined on instance.
at <App>
求解改怎么写?