ui-comment.vue

<template>
  <ui-label :filled="filled" :label-show="true">
    <template slot="label"><slot></slot></template>
      <textarea class="form-control ui-comment-field" v-model="message"></textarea>
  </ui-label>
</template>
<script>

import uiLabel from './ui-label.vue';
export default {
    components: {
        uiLabel
    },
    watch: {
        message (val) {
            this.filled = val ? true : false
        }
    },
    data: () => ({
        message: '',
        filled: false
    })
}
</script>

<template>
  <ui-label :filled="filled" :label-show="true">
    <template slot="label"><slot></slot></template>
      <textarea class="form-control ui-comment-field" v-model="message"></textarea>
  </ui-label>
</template>
<script>
import uiLabel from './ui-label.vue';
export default {
    components: {
        uiLabel
    },
    watch: {
        message (val) {
            this.filled = val ? true : false
            this.$emit('input', val)
        }
    },
    data: () => ({
        message: '',
        filled: false
    })
}
</script>