ant-design-vue/components/collapse/index.js

import Collapse from './Collapse'
import CollapsePanel from './CollapsePanel'

Collapse.Panel = CollapsePanel

/* istanbul ignore next */
Collapse.install = function (Vue) {
  Vue.component(Collapse.name, Collapse)
  Vue.component(CollapsePanel.name, CollapsePanel)
}

export default Collapse