awesome

index.html

<div id="app"></div>

playground.json

{
  "scripts": [
    "react",
    "react-dom"
  ],
  "styles": [
    "font-awesome"
  ]
}

script.js

function App() {
  return (
    <div>
      <h1>Playground integrated to VS code 👋</h1>
      <p>#socool!</p>
      <button onClick={() => alert("Hi!")}>
        Say Hi <span className="fa fa-heart" />
      </button>
    </div>
  );
}

ReactDOM.render(<App />, document.getElementById("app"));

style.css

body {
    background-color: lightblue;
}