<script setup lang="ts">
import { useElementSize } from '@vueuse/core'
import { useTemplateRef } from 'vue'

const el = useTemplateRef('el')
const { width, height } = useElementSize(el)
</script>

<template>
  <div ref="el">
    Height: {{ height }}
    Width: {{ width }}
  </div>
</template>

<template>
  <UseElementSize v-slot="{ width, height }">
    Width: {{ width }} Height: {{ height }}
  </UseElementSize>
</template>

<script setup lang="ts">
import { vElementSize } from '@vueuse/components'

function onResize({ width, height }: { width: number, height: number }) {
  console.log(width, height)
}
</script>

<template>
  <textarea v-element-size="onResize" />
  <!-- with options -->
  <textarea v-element-size="[onResize, { width: 100, height: 100 }, { box: 'content-box' }]" />
</template>