react-class-component.jsx

import React from "react";
import ReactDOM from "react-dom";

class ClassComponent extends React.Component {
  render() {
    return "I'm the class component";
  }
}

const RenderClassComponents = () => {
  return <ClassComponent />;
}

const rootElement = document.getElementById("root");
ReactDOM.render(<RenderClassComponents />, rootElement);