From 06a756f44fd4f2f42b4e40fb6308f4f10c5d5917 Mon Sep 17 00:00:00 2001
From: ICodeMyOwnLife <icodemyownlife@gmail.com>
Date: Fri, 23 Jul 2021 20:50:03 +0700
Subject: [PATCH] fix(MutationOptions): improve the type of onMutate

set the return type of onMutate as Promise<TContext | undefined> instead of Promise<TContext> | Promise<undefined> to make it work with async functions
---
 src/core/types.ts  | 2 +-
 src/react/types.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/core/types.ts b/src/core/types.ts
index ba3fafd529..8d1b94c9ad 100644
--- a/src/core/types.ts
+++ b/src/core/types.ts
@@ -481,7 +481,7 @@ export interface MutationOptions<
   variables?: TVariables
   onMutate?: (
     variables: TVariables
-  ) => Promise<TContext> | Promise<undefined> | TContext | undefined
+  ) => Promise<TContext | undefined> | TContext | undefined
   onSuccess?: (
     data: TData,
     variables: TVariables,
diff --git a/src/react/types.ts b/src/react/types.ts
index 6e6da2f088..ef98597c46 100644
--- a/src/react/types.ts
+++ b/src/react/types.ts
@@ -77,7 +77,7 @@ export interface UseMutationOptions<
   mutationKey?: MutationKey
   onMutate?: (
     variables: TVariables
-  ) => Promise<TContext> | Promise<undefined> | TContext | undefined
+  ) => Promise<TContext | undefined> | TContext | undefined
   onSuccess?: (
     data: TData,
     variables: TVariables,