From 6b448d8afc64ad0f03630a8bd7e0ff245fdb2b59 Mon Sep 17 00:00:00 2001
From: TkDodo <office@dorfmeister.cc>
Date: Tue, 20 Jan 2026 11:19:20 +0100
Subject: [PATCH 1/2] feat(core): add queryKey to QueryObserverResult

---
 packages/query-core/src/queryObserver.ts             | 1 +
 packages/query-core/src/types.ts                     | 4 ++++
 packages/react-query/src/__tests__/useQuery.test.tsx | 7 +++++--
 packages/solid-query/src/__tests__/useQuery.test.tsx | 5 +++++
 4 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/packages/query-core/src/queryObserver.ts b/packages/query-core/src/queryObserver.ts
index 463407a073..9578a43dfa 100644
--- a/packages/query-core/src/queryObserver.ts
+++ b/packages/query-core/src/queryObserver.ts
@@ -586,6 +586,7 @@ export class QueryObserver<
       refetch: this.refetch,
       promise: this.#currentThenable,
       isEnabled: resolveEnabled(options.enabled, query) !== false,
+      queryKey: query.queryKey,
     }
 
     const nextResult = result as QueryObserverResult<TData, TError>
diff --git a/packages/query-core/src/types.ts b/packages/query-core/src/types.ts
index 4f3f4caed2..b805245962 100644
--- a/packages/query-core/src/types.ts
+++ b/packages/query-core/src/types.ts
@@ -625,6 +625,10 @@ export interface QueryObserverBaseResult<
   TData = unknown,
   TError = DefaultError,
 > {
+  /**
+   * The query key used by the query.
+   */
+  queryKey: QueryKey
   /**
    * The last successfully resolved data for the query.
    */
diff --git a/packages/react-query/src/__tests__/useQuery.test.tsx b/packages/react-query/src/__tests__/useQuery.test.tsx
index 3c7f7562a8..d9552fff9e 100644
--- a/packages/react-query/src/__tests__/useQuery.test.tsx
+++ b/packages/react-query/src/__tests__/useQuery.test.tsx
@@ -100,6 +100,7 @@ describe('useQuery', () => {
     expect(states.length).toEqual(2)
 
     expect(states[0]).toEqual({
+      queryKey: key,
       data: undefined,
       dataUpdatedAt: 0,
       error: null,
@@ -129,6 +130,7 @@ describe('useQuery', () => {
     })
 
     expect(states[1]).toEqual({
+      queryKey: key,
       data: 'test',
       dataUpdatedAt: expect.any(Number),
       error: null,
@@ -192,6 +194,7 @@ describe('useQuery', () => {
     rendered.getByText('Status: error')
 
     expect(states[0]).toEqual({
+      queryKey: key,
       data: undefined,
       dataUpdatedAt: 0,
       error: null,
@@ -221,6 +224,7 @@ describe('useQuery', () => {
     })
 
     expect(states[1]).toEqual({
+      queryKey: key,
       data: undefined,
       dataUpdatedAt: 0,
       error: null,
@@ -250,6 +254,7 @@ describe('useQuery', () => {
     })
 
     expect(states[2]).toEqual({
+      queryKey: key,
       data: undefined,
       dataUpdatedAt: 0,
       error: new Error('rejected #2'),
@@ -6788,7 +6793,6 @@ describe('useQuery', () => {
     let fetchCount = 0
     const queryFn = vi.fn().mockImplementation(() => {
       fetchCount++
-      console.log(`Fetching... (attempt ${fetchCount})`)
       return Promise.reject(new Error('Simulated 500 error'))
     })
 
@@ -6906,7 +6910,6 @@ describe('useQuery', () => {
     let fetchCount = 0
     const queryFn = vi.fn().mockImplementation(() => {
       fetchCount++
-      console.log(`Fetching... (attempt ${fetchCount})`)
       return Promise.reject(new Error('Simulated 500 error'))
     })
 
diff --git a/packages/solid-query/src/__tests__/useQuery.test.tsx b/packages/solid-query/src/__tests__/useQuery.test.tsx
index 745621d171..43931b22fd 100644
--- a/packages/solid-query/src/__tests__/useQuery.test.tsx
+++ b/packages/solid-query/src/__tests__/useQuery.test.tsx
@@ -289,6 +289,7 @@ describe('useQuery', () => {
     expect(states.length).toEqual(2)
 
     expect(states[0]).toEqual({
+      queryKey: key,
       data: undefined,
       dataUpdatedAt: 0,
       error: null,
@@ -318,6 +319,7 @@ describe('useQuery', () => {
     })
 
     expect(states[1]).toEqual({
+      queryKey: key,
       data: 'test',
       dataUpdatedAt: expect.any(Number),
       error: null,
@@ -384,6 +386,7 @@ describe('useQuery', () => {
     expect(rendered.getByText('Status: error')).toBeInTheDocument()
 
     expect(states[0]).toEqual({
+      queryKey: key,
       data: undefined,
       dataUpdatedAt: 0,
       error: null,
@@ -413,6 +416,7 @@ describe('useQuery', () => {
     })
 
     expect(states[1]).toEqual({
+      queryKey: key,
       data: undefined,
       dataUpdatedAt: 0,
       error: null,
@@ -442,6 +446,7 @@ describe('useQuery', () => {
     })
 
     expect(states[2]).toEqual({
+      queryKey: key,
       data: undefined,
       dataUpdatedAt: 0,
       error: new Error('rejected'),

From c006582144d7661dd2ee26cf2971011baecfaed0 Mon Sep 17 00:00:00 2001
From: Dominik Dorfmeister <office@dorfmeister.cc>
Date: Tue, 20 Jan 2026 11:20:34 +0100
Subject: [PATCH 2/2] Add queryKey to QueryObserverResult in core

---
 .changeset/thick-mangos-remain.md | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 .changeset/thick-mangos-remain.md

diff --git a/.changeset/thick-mangos-remain.md b/.changeset/thick-mangos-remain.md
new file mode 100644
index 0000000000..15c1335420
--- /dev/null
+++ b/.changeset/thick-mangos-remain.md
@@ -0,0 +1,7 @@
+---
+"@tanstack/query-core": patch
+"@tanstack/react-query": patch
+"@tanstack/solid-query": patch
+---
+
+feat(core): add queryKey to QueryObserverResult