4dkankan-components/docs/examples/input/auto-sizing-textarea.vue

<template>
    <el-input v-model="textarea1" autosize type="textarea" placeholder="Please input" />
    <div style="margin: 20px 0" />
    <el-input v-model="textarea2" :autosize="{ minRows: 2, maxRows: 4 }" type="textarea" placeholder="Please input" />
</template>

<script lang="ts" setup>
import { ref } from 'vue'
const textarea1 = ref('')
const textarea2 = ref('')
</script>