From c6436358500f8c71233279a99f166af6dd8e4196 Mon Sep 17 00:00:00 2001
From: Dominik Dorfmeister <office@dorfmeister.cc>
Date: Sat, 2 Nov 2024 17:42:03 +0000
Subject: [PATCH] fix(useQueries): warn on duplicate keys (#8246)

---
 packages/query-core/src/queriesObserver.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/packages/query-core/src/queriesObserver.ts b/packages/query-core/src/queriesObserver.ts
index a15139d24e..ea0ca7b02a 100644
--- a/packages/query-core/src/queriesObserver.ts
+++ b/packages/query-core/src/queriesObserver.ts
@@ -91,6 +91,15 @@ export class QueriesObserver<
     this.#queries = queries
     this.#options = options
 
+    if (process.env.NODE_ENV !== 'production') {
+      const queryHashes = queries.map((query) => query.queryHash)
+      if (new Set(queryHashes).size !== queryHashes.length) {
+        console.warn(
+          '[QueriesObserver]: Duplicate Queries found. This might result in unexpected behavior.',
+        )
+      }
+    }
+
     notifyManager.batch(() => {
       const prevObservers = this.#observers