fix exports and imports

apps/app/config/i18next.config.js

@@ -10,7 +10,5 @@ const initOptions = {
   defaultNS: 'translation',
 };
 
-module.exports = {
-  defaultLang,
-  initOptions,
-};
+exports.defaultLang = defaultLang;
+exports.initOptions = initOptions;

apps/app/src/server/service/i18next.ts

@@ -1,11 +1,11 @@
 import path from 'path';
 
-import type { Lang } from '@growi/core/dist/interfaces';
+import type { Lang } from '@growi/core';
 import type { InitOptions, TFunction, i18n } from 'i18next';
 import { createInstance } from 'i18next';
 import resourcesToBackend from 'i18next-resources-to-backend';
 
-import { defaultLang, initOptions } from '^/config/i18next.config';
+import * as i18nextConfig from '^/config/i18next.config';
 
 import { resolveFromRoot } from '~/utils/project-dir-utils';
 
@@ -25,7 +25,7 @@ const initI18next = async(overwriteOpts: InitOptions) => {
       ),
     )
     .init({
-      ...initOptions,
+      ...i18nextConfig.initOptions,
       ...overwriteOpts,
     });
   return i18nInstance;
@@ -44,10 +44,20 @@ type Opts = {
 export async function getTranslation(opts?: Opts): Promise<Translation> {
   const globalLang = configManager.getConfig('crowi', 'app:globalLang') as Lang;
   const fixedLang = opts?.lang ?? globalLang;
-  const i18nextInstance = await initI18next({
-    fallbackLng: [fixedLang, defaultLang],
-    ns: opts?.ns,
-  });
+
+  const initOptions: InitOptions = {
+    fallbackLng: [fixedLang, i18nextConfig.defaultLang],
+  };
+
+  // set ns if not null
+  // cz: 'ns: unefined' causes
+  //   TypeError: Cannot read properties of undefined (reading 'forEach')
+  //     at /workspace/growi/node_modules/.pnpm/i18next@23.16.5/node_modules/i18next/dist/cjs/i18next.js:1613:18"
+  if (opts?.ns != null) {
+    initOptions.ns = opts.ns;
+  }
+
+  const i18nextInstance = await initI18next(initOptions);
 
   return {
     t: i18nextInstance.getFixedT(fixedLang, opts?.ns),

apps/app/src/server/util/locale-utils.ts

@@ -1,8 +1,8 @@
 import type { IncomingHttpHeaders } from 'http';
 
-import { Lang } from '@growi/core';
+import { Lang } from '@growi/core/dist/interfaces';
 
-import { defaultLang } from '^/config/i18next.config';
+import * as i18nextConfig from '^/config/i18next.config';
 
 const ACCEPT_LANG_MAP = {
   en: Lang.en_US,
@@ -20,7 +20,7 @@ const getPreferredLanguage = (sortedAcceptLanguagesArray: string[]): Lang => {
     const matchingLang = Object.keys(ACCEPT_LANG_MAP).find(key => lang.includes(key));
     if (matchingLang) return ACCEPT_LANG_MAP[matchingLang];
   }
-  return defaultLang;
+  return i18nextConfig.defaultLang;
 };
 
 /**
@@ -33,7 +33,7 @@ export const detectLocaleFromBrowserAcceptLanguage = (headers: IncomingHttpHeade
   const acceptLanguages = headers['accept-language'];
 
   if (acceptLanguages == null) {
-    return defaultLang;
+    return i18nextConfig.defaultLang;
   }
 
   // 1. trim blank spaces.