hoc.js

// @flow
import React, { Component } from 'react';
import type { ComponentType } from 'react';

export default WrappedComponent=> (
  class EnhancedComponent extends Component<any> {
    wrappedInstance: ?ComponentType<any> = null;
    setWrappedInstance = (c: any) => { this.wrappedInstance = c; };
    render(){
      return (<WrappedComponent ref={this.setWrappedInstance} {...this.props}/>)
    }
  }
);