在vuex mapState中访问vue方法

在vuex mapState中计算数据时，我有一项重要任务要执行。countAlerts每当数据更改时，我都需要调用此vue方法。要做到这一点，计算出的属性需要调用该方法，但是this使用洞察vuex mapState时，范围没有vue方法。

export default {
  name: "Alerts",
  methods: {
    countAlerts(data, period) {
      /// DO SOMETHING, THEN RETURN DATA
      return data;
    }
  },
  computed: {
    ...mapState({
      foundation: state => state.insights.foundation,
      insights: state => {
        return state.insights.list.filter(al => {
          switch (state.insights.foundation.period) {
            case "daily":
               // ====>> NEED TO CALL METHOD HERE <<=====
              al = this.countAlerts(al, "daily");
              if (
                al.threeDayUp ||
                al.threeDayDown ||
                al.greatDayUp ||
                al.greatDayDown
              ) {
                return al;
              }
              break;
            ///  MORE CODE ABOVE
          }
        });
      }
    })
  }
};