<template>
  <button @click="inc">{{ count }}</button>
  <p v-if="done">done!</p>
</template>

<script setup>
import { ref, computed } from 'vue'

export const count = ref(0)
export const done = computed(() => count.value > 100)
export const inc = () => count.value++
console.log(done.value)
</script>

<script setup noref>
export let count = 0 // @ref
export const done = count > 100 // @computed
export const inc = () => count++
console.log(done)
</script>