React使用portal提示 The types returned by 'render()' are incompatible between these types. Type 'ReactPortal' is not assignable to type 'ReactNode'. Type '{}' is not assignable to type 'ReactNode'.

原因：组件返回了个不是<></>的东西

原先代码：

export default class Index extends React.PureComponent {
  render() {
    return reactDOM.createPortal(
      <div>传送内容</div>,
      document.body
    );
  }
}

结局方案：

export default class Index extends React.PureComponent {
  render() {
    return <>
      reactDOM.createPortal(
      <div>传送内容</div>,
      document.body
      );
    </>
  }
}