Refactor to component

after.js

import {Component} from 'react'
export default class Thingy extends Component {
  render() {
    const {a, b} = this.props;
    return <div>{a} <span>{b}</span></div>
  }
}

before.js

export default ({a, b}) => {
  <div>{a} <span>{b}</span></div>
}