fix(query-devtools/utils): make 'last updated' sort return 0 for queries with equal 'dataUpdatedAt' to follow the standard comparator contract (#10812)

Author: sukvvon

.changeset/devtools-date-sort-equal-timestamps.md

@@ -0,0 +1,5 @@
+---
+'@tanstack/query-devtools': patch
+---
+
+fix(query-devtools/utils): make 'last updated' sort return 0 for queries with equal 'dataUpdatedAt' to follow the standard comparator contract

packages/query-devtools/src/__tests__/utils.test.ts

@@ -1076,6 +1076,13 @@ describe('Utils tests', () => {
         expect(dateSort(older, newer)).toBe(1)
         expect(dateSort(newer, older)).toBe(-1)
       })
+
+      it('should return 0 when both queries share the same "dataUpdatedAt"', () => {
+        const a = buildQuery(['a'], { dataUpdatedAt: 100 })
+        const b = buildQuery(['b'], { dataUpdatedAt: 100 })
+
+        expect(dateSort(a, b)).toBe(0)
+      })
     })
 
     describe("'query hash'", () => {

packages/query-devtools/src/utils.tsx

@@ -101,8 +101,10 @@ const getStatusRank = (q: Query) =>
 
 const queryHashSort: SortFn = (a, b) => a.queryHash.localeCompare(b.queryHash)
 
-const dateSort: SortFn = (a, b) =>
-  a.state.dataUpdatedAt < b.state.dataUpdatedAt ? 1 : -1
+const dateSort: SortFn = (a, b) => {
+  const diff = b.state.dataUpdatedAt - a.state.dataUpdatedAt
+  return diff < 0 ? -1 : diff > 0 ? 1 : 0
+}
 
 const statusAndDateSort: SortFn = (a, b) => {
   if (getStatusRank(a) === getStatusRank(b)) {