Vue.js 3.x CheckboxForm コンポーネント

import { computed } from 'https://cdnjs.cloudflare.com/ajax/libs/vue/3.0.2/vue.esm-browser.js';
import { getWrapClass, generalizeOptions } from 'https://wws.jp/_export/code/vuejs/vue3/form_utils?codeblock=0';
 
const CheckboxForm = {
  template: `
    <div :class="computedControlWrapperClasses" :style="controlWrapperStyles">
      <label v-for="(opt, idx) in computedOptions"
        :class="optionClasses"
        :style="optionStyles"
      >
        <input type="checkbox"
          :class="controlClasses"
          :style="controlStyles"
          :checked="isChecked(opt.value)"
          @change="onChange(opt.value)"
        >
        {{ opt.title }}
      </label>
      <div :class="computedMessageWrapperClasses" :style="messageWrapperStyles">
        <template v-for="msg in errors">
          <span>{{ msg }}</span><br>
        </template>
      </div>
    </div>
  `,
  props: {
    value:                 { type: Array },
    options:               { type: Array,  default: [] },
    errors:                { type: Array,  default: [] },
    controlWrapperClasses: { type: Array,  default: [] },
    controlWrapperStyles:  { type: Object, default: {} },
    controlClasses:        { type: Array,  default: [] },
    controlStyles:         { type: Object, default: {} },
    optionClasses:         { type: Array,  default: ['checkbox-inline'] },
    optionStyles:          { type: Object, default: {} },
    messageWrapperClasses: { type: Array,  default: [] },
    messageWrapperStyles:  { type: Object, default: {} },
    controlErrorClass:     { type: String, default: 'has-error' },
    messageErrorClass:     { type: String, default: 'text-danger' },
  },
 
  setup(props, context) {
    const computedControlWrapperClasses = computed(() => {
      return getWrapClass(
        props.errors,
        props.controlWrapperClasses,
        props.controlErrorClass
      )
    })
 
    const computedMessageWrapperClasses = computed(() => {
      return getWrapClass(
        props.errors,
        props.messageWrapperClasses,
        props.messageErrorClass
      )
    })
 
    const computedOptions = computed(() => {
      return generalizeOptions(props.options)
    })
 
    function onChange(v) {
      const idx = props.value.indexOf(v)
      if (idx >= 0) {
        props.value.splice(idx, 1)
      } else {
        props.value.splice(0, 0, v)
      }
      context.emit('update:value', props.value)
    }
 
    function isChecked(v) {
      return (props.value.indexOf(v) >= 0) ? true : false
    }
 
    return {
      computedControlWrapperClasses,
      computedMessageWrapperClasses,
      computedOptions,
      isChecked,
      onChange
    }
  }
};
export default CheckboxForm;