ant-design-vue/components/button/button-group.jsx

import { filterEmpty } from '../_util/props-util'
const ButtonGroupProps = {
  prefixCls: {
    default: 'ant-btn-group',
    type: String,
  },
  size: {
    validator (value) {
      return ['small', 'large', 'default'].includes(value)
    },
  },
}
export { ButtonGroupProps }
export default {
  name: 'ButtonGroup',
  props: ButtonGroupProps,
  data () {
    return {
      sizeMap: {
        large: 'lg',
        small: 'sm',
      },
    }
  },
  computed: {
    classes () {
      const { prefixCls, size, sizeMap } = this
      const sizeCls = sizeMap[size] || ''
      return [
        {
          [`${prefixCls}`]: true,
          [`${prefixCls}-${sizeCls}`]: sizeCls,
        },
      ]
    },
  },
  render () {
    const { classes, $slots } = this
    return (
      <div class={classes}>
        {filterEmpty($slots.default)}
      </div>
    )
  },
}