fix(types): remove duplicate Array condition in MutationKey type (#9754)

jinseoIT · lachlancollins · autofix-ci[bot] · web-flow · commit 20ef922a0a7c · 2025-10-16T14:39:00.000+02:00
* fix(types): preserve readonly mutation keys by removing duplicate Array check

* Fix duplicate Array condition in MutationKey type

* ci: apply automated fixes

* fix: make MutationKey type consistent with QueryKey

* chore: trigger GitHub UI refresh

---------

Co-authored-by: Lachlan Collins &lt;1667261+lachlancollins@users.noreply.github.com&gt;
Co-authored-by: autofix-ci[bot] &lt;114827586+autofix-ci[bot]@users.noreply.github.com&gt;
diff --git a/.changeset/chilled-squids-grow.md b/.changeset/chilled-squids-grow.md
@@ -0,0 +1,5 @@
+---
+'@tanstack/query-core': patch
+---
+
+fix(types): remove duplicate Array condition in MutationKey type
diff --git a/packages/query-core/src/types.ts b/packages/query-core/src/types.ts
@@ -1070,7 +1070,7 @@ export type InfiniteQueryObserverResult<
 export type MutationKey = Register extends {
   mutationKey: infer TMutationKey
 }
-  ? TMutationKey extends Array<unknown>
+  ? TMutationKey extends ReadonlyArray<unknown>
     ? TMutationKey
     : TMutationKey extends Array<unknown>
       ? TMutationKey

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +'@tanstack/query-core': patch
 +---
++
 +fix(types): remove duplicate Array condition in MutationKey type
Original file line number	Diff line number	Diff line change
`@@ -1070,7 +1070,7 @@ export type InfiniteQueryObserverResult<`
`1070`	`1070`	`export type MutationKey = Register extends {`
`1071`	`1071`	`mutationKey: infer TMutationKey`
`1072`	`1072`	`}`
`1073`		`- ? TMutationKey extends Array<unknown>`
	`1073`	`+ ? TMutationKey extends ReadonlyArray<unknown>`
`1074`	`1074`	`? TMutationKey`
`1075`	`1075`	`: TMutationKey extends Array<unknown>`
`1076`	`1076`	`? TMutationKey`