Vue show viewport height and width in title for debugging with vueuse

App.vue

<script>
import { ref, computed, onMounted } from "@vue/composition-api";
import { useWindowSize, useTitle } from "@vueuse/core";

export default {
  setup() {
    const { width, height } = useWindowSize();
    const title = computed(() => {
      return `w: ${width.value} h: ${height.value}`;
    });
    useTitle(title);

    return {};
  },
};

</script>