From 17d260ba4e3db9f079e17c1946ea2c34344417be Mon Sep 17 00:00:00 2001
From: Zixuan Fan <zixuanfan@meshy.ai>
Date: Mon, 18 Aug 2025 18:11:20 +0800
Subject: [PATCH] fix: SWRMutationConfiguration.optimisticData types is not
 correct

---
 src/mutation/types.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mutation/types.ts b/src/mutation/types.ts
index c3623b7ef..91f2ac721 100644
--- a/src/mutation/types.ts
+++ b/src/mutation/types.ts
@@ -29,7 +29,9 @@ export type SWRMutationConfiguration<
   populateCache?:
     | boolean
     | ((result: Data, currentData: SWRData | undefined) => SWRData)
-  optimisticData?: SWRData | ((currentData?: SWRData) => SWRData)
+  optimisticData?:     
+    | Data
+    | ((currentData: Data | undefined, displayedData: Data | undefined) => Data)
   rollbackOnError?: boolean | ((error: unknown) => boolean)
   fetcher?: MutationFetcher<Data, SWRMutationKey, ExtraArg>
   onSuccess?: (