sam-react-prod/src/i18n/request.ts

import { getRequestConfig } from 'next-intl/server';
import { locales, type Locale } from './config';

export default getRequestConfig(async ({ requestLocale }) => {
  // This typically corresponds to the `[locale]` segment
  let locale = await requestLocale;

  // Ensure that the incoming `locale` is valid
  if (!locale || !locales.includes(locale as Locale)) {
    locale = 'ko'; // fallback to default
  }

  return {
    locale,
    messages: (await import(`@/messages/${locale}.json`)).default,
  };
});