wip

packages/lib/client-only/providers/i18n-server.tsx

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+import type { I18n, Messages } from '@lingui/core';
+import { setupI18n } from '@lingui/core';
+
+import {
+  APP_I18N_OPTIONS,
+  SUPPORTED_LANGUAGE_CODES,
+  isValidLanguageCode,
+} from '../../constants/i18n';
+import { remember } from '../../utils/remember';
+
+type SupportedLanguages = (typeof SUPPORTED_LANGUAGE_CODES)[number];
+
+export async function loadCatalog(lang: SupportedLanguages): Promise<{
+  [k: string]: Messages;
+}> {
+  const extension = process.env.NODE_ENV === 'development' ? 'po' : 'js';
+
+  // const { messages } = await import(`../../translations/${lang}/web.${extension}`);
+  const messages = {};
+
+  return {
+    [lang]: messages,
+  };
+}
+
+const catalogs = Promise.all(SUPPORTED_LANGUAGE_CODES.map(loadCatalog));
+
+// transform array of catalogs into a single object
+const allMessages = async () => {
+  return await catalogs.then((catalogs) =>
+    catalogs.reduce((acc, oneCatalog) => {
+      return {
+        ...acc,
+        ...oneCatalog,
+      };
+    }, {}),
+  );
+};
+
+type AllI18nInstances = { [K in SupportedLanguages]: I18n };
+
+// eslint-disable-next-line @typescript-eslint/consistent-type-assertions
+export const allI18nInstances = remember('i18n.allI18nInstances', async () => {
+  const loadedMessages = await allMessages();
+
+  // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
+  return SUPPORTED_LANGUAGE_CODES.reduce((acc, lang) => {
+    const messages = loadedMessages[lang] ?? {};
+
+    const i18n = setupI18n({
+      locale: lang,
+      messages: { [lang]: messages },
+    });
+
+    return { ...acc, [lang]: i18n };
+  }, {}) as AllI18nInstances;
+});
+
+// eslint-disable-next-line @typescript-eslint/ban-types
+export const getI18nInstance = async (lang?: SupportedLanguages | (string & {})) => {
+  const instances = await allI18nInstances;
+
+  if (!isValidLanguageCode(lang)) {
+    return instances[APP_I18N_OPTIONS.sourceLang];
+  }
+
+  return instances[lang] ?? instances[APP_I18N_OPTIONS.sourceLang];
+};