From 085305e34acc541be02b727221f825b38006163f Mon Sep 17 00:00:00 2001
From: SophieDonut <sophie@trydonut.com>
Date: Wed, 30 Oct 2019 15:59:25 +0100
Subject: [PATCH] Update onComplete handler typings

Fixes #3546
---
 packages/common/src/types/types.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/common/src/types/types.ts b/packages/common/src/types/types.ts
index 5e5a25c0a3..581ddaba20 100644
--- a/packages/common/src/types/types.ts
+++ b/packages/common/src/types/types.ts
@@ -101,7 +101,7 @@ export interface BaseMutationOptions<
   client?: ApolloClient<object>;
   notifyOnNetworkStatusChange?: boolean;
   context?: Context;
-  onCompleted?: (data: TData) => void;
+  onCompleted?: (data: TData | undefined) => void;
   onError?: (error: ApolloError) => void;
   fetchPolicy?: WatchQueryFetchPolicy;
   ignoreResults?: boolean;