index.html

<!DOCTYPE html>
<html>
<head>
  <title>Befunge93</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
</head>

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

  <script src="../node_modules/react/umd/react.development.js"></script>
  <script src="../node_modules/react-dom/umd/react-dom.development.js"></script>

  <script type="module">
    import init from '../pkg/befunge_interpreter.js';
    const setup = async () => await init();

    setup().then(() => {
      document.querySelector("#run").addEventListener("click",function() {
        import('../pkg/befunge_interpreter.js').then(module =>
          module.read(
            document.querySelector("#input").value,
            document.querySelector("#code").value
          )
        );
      });
    });
  </script>
  <script src="./bundle.js"></script>
</body>
</html>