AuthProvider

interface AuthAdapter {
  getSession: () => Promise<AuthSession>;
  signIn: (credentials: Record<string, string>) => Promise<AuthSession>;
  signOut: () => Promise<void>;
}

interface AuthSession {
  user: AuthUser | null;
  token: string | null;
  expiresAt: number | null;
}

interface AuthUser {
  id: string;
  email?: string;
  name?: string;
  image?: string;
  [key: string]: unknown;
}

const myAuthAdapter: AuthAdapter = {
  getSession: async () => {
    const res = await fetch("/api/auth/session");
    if (!res.ok) return { user: null, token: null, expiresAt: null };
    return res.json();
  },
  signIn: async (credentials) => {
    const res = await fetch("/api/auth/signin", {
      method: "POST",
      body: JSON.stringify(credentials),
    });
    return res.json();
  },
  signOut: async () => {
    await fetch("/api/auth/signout", { method: "POST" });
  },
};

<AuthProvider adapter={myAuthAdapter}>
  <App />
</AuthProvider>