vueuse error

VueUseDemo.vue

<script>
import { ref } from 'vue'
import { watchDebounced } from '@vueuse/core'
export default {
    setup(){
        const input = ref('')
        const updated = ref(0)

        watchDebounced(input, () => {
        updated.value += 1
        }, { debounce: 1000 })

        return {
            input,
            updated
        }
    }
}

</script>

<template>
  <div>
    <input v-model="input" placeholder="Try to type anything..." type="text">
    <note>Delay is set to 1000ms for this demo.</note>

    <p>Input: {{ input }}</p>
    <p>Times Updated: {{ updated }}</p>
  </div>
</template>