fix(next-international): resolve consistent scoped types (#329)

Author: ubinatus

packages/next-international/src/app/server/create-get-scoped-i18n.ts

@@ -10,7 +10,9 @@ export function createGetScopedI18n<Locales extends ImportedLocales, Locale exte
 ) {
   const localeCache = new Map<string, ReturnType<typeof createT<Locale, undefined>>>();
 
-  return async function getScopedI18n<Scope extends Scopes<Locale>>(scope: Scope) {
+  return async function getScopedI18n<Scope extends Scopes<Locale>>(
+    scope: Scope,
+  ): Promise<ReturnType<typeof createT<Locale, Scope>>> {
     const locale = getLocaleCache();
     const cacheKey = `${locale}-${scope}`;
     const cached = localeCache.get(cacheKey);

packages/next-international/src/common/create-use-scoped-i18n.ts

@@ -9,7 +9,7 @@ export function createScopedUsei18n<Locale extends BaseLocale>(
 ) {
   const localeCache = new Map<string, ReturnType<typeof createT<Locale, undefined>>>();
 
-  return function useScopedI18n<Scope extends Scopes<Locale> | undefined>(scope: Scope) {
+  return function useScopedI18n<Scope extends Scopes<Locale>>(scope: Scope): ReturnType<typeof createT<Locale, Scope>> {
     const context = useContext(I18nClientContext);
 
     if (!context) {