index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <title>Tetris</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <style>
      html {
        font-size: 1.5em;
      }
    </style>
  </head>
  <body>
    <div id="root"></div>

    <script type="module">
      import "https://unpkg.com/react@18/umd/react.development.js";
      import "https://unpkg.com/react-dom@18/umd/react-dom.development.js";
      import init, { App, WasmReact } from "./pkg/tetris.js";

      await init();
      WasmReact.useReact(window.React);

      const root = ReactDOM.createRoot(document.getElementById("root"));
      root.render(
        React.createElement(App, {
          width: 10,
          height: 25,
        })
      );
    </script>
  </body>
</html>