vant/packages/radio-group/index.js

import { use } from '../utils';

const [sfc, bem] = use('radio-group');

export default sfc({
  props: {
    value: null,
    disabled: Boolean
  },

  watch: {
    value(value) {
      this.$emit('change', value);
    }
  },

  render(h) {
    return <div class={bem()}>{this.$slots.default}</div>;
  }
});