IanMitchell

```tsx title="pages/register.tsx"
import { Fragment, useEffect, useState } from "react"; // [!code ++]
import { supported } from "@github/webauthn-json"; // [!code ++]

export default function Register() {
  const [username, setUsername] = useState("");
  const [email, setEmail] = useState("");
  const [isAvailable, setIsAvailable] = useState<boolean | null>(null); // [!code ++]

  useEffect(() => { // [!code ++]