From 38454a93f4e835de9930af8a54b8d41e26ca3280 Mon Sep 17 00:00:00 2001
From: Wonsuk Choi <sukvvon@gmail.com>
Date: Tue, 3 Mar 2026 03:25:28 +0900
Subject: [PATCH 1/2] fix(vue-query/useMutation): add missing '_defaulted' omit
 in 'UseMutationOptionsBase'

---
 packages/vue-query/src/useMutation.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/vue-query/src/useMutation.ts b/packages/vue-query/src/useMutation.ts
index 2bb852acbf5..00c4b8fda27 100644
--- a/packages/vue-query/src/useMutation.ts
+++ b/packages/vue-query/src/useMutation.ts
@@ -20,6 +20,7 @@ import type {
   MutateOptions,
   MutationObserverOptions,
   MutationObserverResult,
+  OmitKeyof,
 } from '@tanstack/query-core'
 import type { MaybeRefDeep, ShallowOption } from './types'
 import type { QueryClient } from './queryClient'
@@ -31,7 +32,10 @@ type MutationResult<TData, TError, TVariables, TOnMutateResult> =
   >
 
 type UseMutationOptionsBase<TData, TError, TVariables, TOnMutateResult> =
-  MutationObserverOptions<TData, TError, TVariables, TOnMutateResult> &
+  OmitKeyof<
+    MutationObserverOptions<TData, TError, TVariables, TOnMutateResult>,
+    '_defaulted'
+  > &
     ShallowOption
 
 export type UseMutationOptions<

From 1fa850daa31fd8494d0fa335e1adad4cd477be9c Mon Sep 17 00:00:00 2001
From: Wonsuk Choi <sukvvon@gmail.com>
Date: Tue, 3 Mar 2026 03:27:47 +0900
Subject: [PATCH 2/2] chore(.changeset): add changeset for '_defaulted' omit
 fix

---
 .changeset/fuzzy-chicken-listen.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/fuzzy-chicken-listen.md

diff --git a/.changeset/fuzzy-chicken-listen.md b/.changeset/fuzzy-chicken-listen.md
new file mode 100644
index 00000000000..48fb4b16150
--- /dev/null
+++ b/.changeset/fuzzy-chicken-listen.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/vue-query': patch
+---
+
+fix(vue-query/useMutation): add missing '_defaulted' omit in 'UseMutationOptionsBase'