res = await client.api.books.$get(); if (!res.ok) { throw new Error("σʔλͷऔಘʹࣦഊ͠·ͨ͠"); } const data = await res.json(); return data; } export default function SwrPage() { const { data, error, isLoading } = useSWR("/api/books", fetcher); if (error) return <div>Τϥʔ͕ൃੜ͠·ͨ͠</div>; if (isLoading) return <div>ಡΈࠐΈத...</div>;