Nuxt2+Composition APIのhistoryモードでのhashのwatch

import { defineComponent, useRoute, watch } from "@nuxtjs/composition-api";
export default defineComponent({
  setup(props) {
    const route = useRoute();
    watch(
      ()=>route.value.hash,
      (newVal,oldVal) => {
        console.log('routewatch',newVal, oldVal);
      },
      {immediate: true}
    )
  }
}