src/index.ts(1,15): error TS2459: Module '"a/server"' declares 'FileRouter' locally, but it is not exported. about bunchee HOT 1 CLOSED

diff --git a/packages/a/package.json b/packages/a/package.json
index 7adeca4..5a7b607 100644
--- a/packages/a/package.json
+++ b/packages/a/package.json
@@ -74,8 +74,7 @@
     },
     "./internal/types": {
       "types": "./dist/internal/types.d.ts",
-      "import": "./dist/internal/types.mjs",
-      "require": "./dist/internal/types.js"
+      "default": "./dist/internal/types.js"
     }
   },
   "typesVersions": {
diff --git a/packages/a/src/server.ts b/packages/a/src/server.ts
index a178b44..632eb74 100644
--- a/packages/a/src/server.ts
+++ b/packages/a/src/server.ts
@@ -76,3 +76,5 @@ export const createServerHandler = <TRouter extends FileRouter>(
 
 export const extractRouterConfig = (router: FileRouter) =>
   buildPermissionsInfoHandler({ router })();
+
+export { type FileRouter }
\ No newline at end of file