ant-design-vue/components/auto-complete/InputElement.jsx

import PropTypes from '../_util/vue-types';
import { cloneElement } from '../_util/vnode';
import { getOptionProps, getListeners } from '../_util/props-util';
function chaining(...fns) {
  return function(...args) {
    // eslint-disable-line
    // eslint-disable-line
    for (let i = 0; i < fns.length; i++) {
      if (fns[i] && typeof fns[i] === 'function') {
        fns[i].apply(this, args);
      }
    }
  };
}
export default {
  name: 'InputElement',
  inheritAttrs: false,
  props: {
    value: PropTypes.any,
    disabled: PropTypes.bool,
    placeholder: PropTypes.string,
  },
  render() {
    const { $slots = {}, $attrs = {}, placeholder } = this;
    const listeners = getListeners(this);
    const props = getOptionProps(this);
    const value = props.value === undefined ? '' : props.value;
    const children = $slots.default[0];
    const { componentOptions = {} } = $slots.default[0];
    const { listeners: events = {} } = componentOptions;
    const newEvent = { ...events };

    for (const [eventName, event] of Object.entries(listeners)) {
      newEvent[eventName] = chaining(event, events[eventName]);
    }
    const attrs = { ...$attrs, value };
    // https://github.com/vueComponent/ant-design-vue/issues/1761
    delete props.placeholder;
    if (placeholder) {
      props.placeholder = placeholder;
      attrs.placeholder = placeholder;
    }
    return cloneElement(children, {
      domProps: {
        value,
      },
      props,
      on: newEvent,
      attrs,
      ref: 'ele',
    });
  },
};