how to write script tag in react js code example

Example 1: react insert script tag

useEffect(() => {
  const script = document.createElement('script');

  script.src = "https://use.typekit.net/foobar.js";
  script.async = true;

  document.body.appendChild(script);

  return () => {
    document.body.removeChild(script);
  }
}, []);

Example 2: import a script to my react componetn

import React,{Component} from "react";
import ReactDOM from "react-dom";

import "./styles.css";

class App extends Component {
  componentDidMount() {
    const script = document.createElement("script");    script.async = true;    script.src = "https://some-scripturl.js";    this.div.appendChild(script);  }
  render() {
    return (
      <div className="App" ref={el => (this.div = el)}>        <h1>Hello react</h1>
        {/* Script is inserted here */}
      </div>
    );
  }
}

export default App;

Example 3: react script tag for html

<script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>