fix: add optional check while accessing webpack internals #2968 (#3120)

Author: MadaraUchiha-314

.changeset/chilly-experts-walk.md

@@ -0,0 +1,5 @@
+---
+'@module-federation/node': patch
+---
+
+add optional check while accessing webpack internals

packages/node/src/utils/hot-reload.ts

@@ -168,7 +168,7 @@ export const performReload = async (
     }
   });
   //@ts-ignore
-  __webpack_require__.federation.instance.moduleCache.clear();
+  __webpack_require__?.federation?.instance?.moduleCache?.clear();
   helpers.global.resetFederationGlobalInfo();
   globalThis.moduleGraphDirty = false;
   globalThis.mfHashMap = {};