Core: Try to workaround legacy i18n middleware under /i18n export without breaking changes

Author: fuma-nama

.changeset/cyan-hairs-raise.md

@@ -0,0 +1,5 @@
+---
+'fumadocs-core': patch
+---
+
+Try to workaround legacy i18n middleware under `/i18n` export without breaking changes

packages/core/package.json

@@ -62,8 +62,8 @@
     },
     "./i18n": {
       "browser": "./dist/i18n/index.js",
-      "import": "./dist/i18n/index.server.js",
-      "types": "./dist/i18n/index.server.d.ts"
+      "import": "./dist/i18n/legacy.js",
+      "types": "./dist/i18n/legacy.d.ts"
     },
     "./i18n/middleware": {
       "import": "./dist/i18n/middleware.js",

packages/core/src/i18n/index.server.ts

@@ -0,0 +1,20 @@
+import type { NextMiddleware } from 'next/dist/server/web/types';
+import type * as Middleware from './middleware';
+
+export * from './index';
+
+/**
+ * @deprecated Import from `fumadocs-core/i18n/middleware` instead
+ */
+export const createI18nMiddleware: typeof Middleware.createI18nMiddleware = (
+  ...args
+): NextMiddleware => {
+  console.warn(
+    '[Fumadocs Core] Please import i18n middleware from `fumadocs-core/i18n/middleware` instead, this export will soon be removed.',
+  );
+  const middleware: Promise<NextMiddleware> = import('./middleware').then(
+    (res) => res.createI18nMiddleware(...args),
+  );
+
+  return async (...args) => (await middleware)(...args);
+};