next-intl/dist/esm/development/server/react-server/getConfig.js

Internationalization (i18n) for Next.js

import { cache } from 'react';
import { initializeConfig, _createIntlFormatters, _createCache } from 'use-intl/core';
import { isPromise } from '../../shared/utils.js';
import { getRequestLocale } from './RequestLocale.js';
import getRuntimeConfig from 'next-intl/config';
import validateLocale from './validateLocale.js';

// This is automatically inherited by `NextIntlClientProvider` if
// the component is rendered from a Server Component
function getDefaultTimeZoneImpl() {
  return Intl.DateTimeFormat().resolvedOptions().timeZone;
}
const getDefaultTimeZone = cache(getDefaultTimeZoneImpl);
async function receiveRuntimeConfigImpl(getConfig, localeOverride) {
  if (typeof getConfig !== 'function') {
    throw new Error(`Invalid i18n request configuration detected.

Please verify that:
1. In case you've specified a custom location in your Next.js config, make sure that the path is correct.
2. You have a default export in your i18n request configuration file.

See also: https://next-intl.dev/docs/usage/configuration#i18n-request
`);
  }
  const params = {
    locale: localeOverride,
    // In case the consumer doesn't read `params.locale` and instead provides the
    // `locale` (either in a single-language workflow or because the locale is
    // read from the user settings), don't attempt to read the request locale.
    get requestLocale() {
      return localeOverride ? Promise.resolve(localeOverride) : getRequestLocale();
    }
  };
  let result = getConfig(params);
  if (isPromise(result)) {
    result = await result;
  }
  if (!result.locale) {
    throw new Error('No locale was returned from `getRequestConfig`.\n\nSee https://next-intl.dev/docs/usage/configuration#i18n-request');
  }
  {
    validateLocale(result.locale);
  }
  return result;
}
const receiveRuntimeConfig = cache(receiveRuntimeConfigImpl);
const getFormatters = cache(_createIntlFormatters);
const getCache = cache(_createCache);
async function getConfigImpl(localeOverride) {
  const runtimeConfig = await receiveRuntimeConfig(getRuntimeConfig, localeOverride);
  return {
    ...initializeConfig(runtimeConfig),
    _formatters: getFormatters(getCache()),
    timeZone: runtimeConfig.timeZone || getDefaultTimeZone()
  };
}
const getConfig = cache(getConfigImpl);

export { getConfig as default };