chore: configure some stuff

example/index.html

@@ -0,0 +1,2 @@
+<div id="root"></div>
+<script src="./index.tsx"></script>

example/index.tsx

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+import * as React from 'react';
+import { render } from 'react-dom';
+
+function App() {
+  return <h1>Hello world</h1>;
+}
+
+render(<App />, document.getElementById('root'));