chore: updated tsd tests to cover FetchData undefined case

Author: csorfab

packages/graphql-hooks/test-d/hooks.test-d.ts

@@ -1,4 +1,4 @@
-import { expectType } from 'tsd'
+import { expectType, expectError } from 'tsd'
 import {
   FetchData,
   ResetFunction,
@@ -36,6 +36,10 @@ type UseClientRequestReturn = [
 expectType<UseClientRequestReturn>(useClientRequest(query))
 expectType<UseClientRequestReturn>(useClientRequest(query, clientRequestOptions))
 
+const [fetchData] = useClientRequest(query);
+expectType<Promise<UseClientRequestResult<any, object> | undefined>>(fetchData());
+expectError<Promise<UseClientRequestResult<any, object>>>(fetchData());
+
 const useQueryOptions: UseQueryOptions = {
   ssr: false,
   skip: false,