fix (ai/react): include fetch parameter as part of useChat (#2156)

Co-authored-by: Lars Grammel <lars.grammel@gmail.com>

Author: jeremyphilemon

.changeset/sweet-kiwis-clean.md

@@ -0,0 +1,5 @@
+---
+'@ai-sdk/react': patch
+---
+
+fix (ai/react): include fetch parameter as part of useChat

packages/react/src/use-chat.ts

@@ -196,6 +196,7 @@ export function useChat({
   headers,
   body,
   generateId = generateIdFunc,
+  fetch,
 }: UseChatOptions & {
   key?: string;
 
@@ -405,6 +406,7 @@ By default, it's set to 0, which will disable the feature.
       messagesRef,
       abortControllerRef,
       generateId,
+      fetch,
     ],
   );