ant-design-vue/components/transfer/item.jsx

import PropTypes from '../_util/vue-types'
import classNames from 'classnames'
// import PureRenderMixin from 'rc-util/lib/PureRenderMixin'
import Lazyload from '../vc-lazy-load'
import Checkbox from '../checkbox'

function noop () {
}

export default {
  // shouldComponentUpdate (...args: any[]) {
  //   return PureRenderMixin.shouldComponentUpdate.apply(this, args)
  // }
  props: {
    renderedText: PropTypes.any,
    renderedEl: PropTypes.any,
    item: PropTypes.any,
    lazy: PropTypes.oneOfType([
      PropTypes.bool,
      PropTypes.object,
    ]),
    checked: PropTypes.bool,
    prefixCls: PropTypes.string,
  },
  name: 'Item',
  render () {
    const { renderedText, renderedEl, item, lazy, checked, prefixCls } = this.$props

    const className = classNames({
      [`${prefixCls}-content-item`]: true,
      [`${prefixCls}-content-item-disabled`]: item.disabled,
    })

    const listItem = (
      <li
        class={className}
        title={renderedText}
        onClick={item.disabled ? noop : () => {
          this.$emit('click', item)
        }}
      >
        <Checkbox checked={checked} disabled={item.disabled} />
        <span>{renderedEl}</span>
      </li>
    )
    let children = null
    if (lazy) {
      const lazyProps = {
        props: {
          height: 32,
          offset: 500,
          throttle: 0,
          debounce: false,
          ...lazy,
        },
      }
      children = <Lazyload {...lazyProps}>{listItem}</Lazyload>
    } else {
      children = listItem
    }
    return children
  },
}