Added support for single localization

dist/modules/i18n/localeMiddleware.js

@@ -1,5 +1,5 @@
+import { negotiateLocale, isValidLocale, LOCALE_COOKIE_NAME } from '../i18n/index.js';
 import { CONSENT_COOKIE, parseConsent } from '../consent/storage.js';
-import { isValidLocale, LOCALE_COOKIE_NAME, negotiateLocale } from '../i18n/index.js';
 /**
  * First path segment of a URL pathname, or '' for root.
  * '/pl/o-nas' → 'pl', '/o-nas' → 'o-nas', '/' → ''.
@@ -32,18 +32,26 @@ import { isValidLocale, LOCALE_COOKIE_NAME, negotiateLocale } from '../i18n/inde
  *   if (r.cookie) res.cookies.set(r.cookie.name, r.cookie.value)
  *   return res
  * }
- */ export function createLocaleMiddleware({ config, consentCategory = 'functional', consentCookieName = CONSENT_COOKIE, cookieName = LOCALE_COOKIE_NAME }) {
+ */ export function createLocaleMiddleware({ config, cookieName = LOCALE_COOKIE_NAME, consentCategory = 'functional', consentCookieName = CONSENT_COOKIE }) {
     // Whether the locale cookie may be written: 'necessary' is always granted;
     // 'functional' (default) requires the visitor to have consented.
     function mayPersistLocale(request) {
-        if (consentCategory === 'necessary') {
-            return true;
-        }
+        if (consentCategory === 'necessary') return true;
         const consent = parseConsent(request.cookies.get(consentCookieName)?.value);
         return consent?.[consentCategory] === true;
     }
     return function localeMiddleware(request) {
         const { pathname } = request.nextUrl;
+        // Single-locale sites have no /pl, /en prefix and no negotiation — one
+        // language, no redirect. The middleware becomes a pass-through: paths stay
+        // as-is (/o-nas), nothing to detect or persist. (Projects that are truly
+        // single-locale usually don't even mount this middleware, but guarding here
+        // makes it safe if they do.)
+        if (config.locales.length === 1) {
+            return {
+                type: 'next'
+            };
+        }
         // Already locale-prefixed (e.g. the visitor switched language by
         // navigating to /en). Routing is fine — but if the URL's locale differs
         // from the stored cookie, the visitor is *choosing* a language, and we
@@ -68,9 +76,9 @@ import { isValidLocale, LOCALE_COOKIE_NAME, negotiateLocale } from '../i18n/inde
         }
         // Resolve the locale to use
         const locale = negotiateLocale({
+            cookieLocale: request.cookies.get(cookieName)?.value ?? null,
             acceptLanguage: request.headers.get('accept-language'),
-            config,
-            cookieLocale: request.cookies.get(cookieName)?.value ?? null
+            config
         });
         // Redirect to the locale-prefixed path, preserving the rest
         const url = request.nextUrl.clone();