From 1fd1fb9c4583e7d1dce6d0399255cbf89031010c Mon Sep 17 00:00:00 2001
From: Nicolas Hrubec <nico.hrubec@sentry.io>
Date: Mon, 12 Oct 2026 10:59:52 +0200
Subject: [PATCH] fix(react-router): Respect custom default integrations

Co-Authored-By: Codex <codex@openai.com>
---
 packages/react-router/src/server/sdk.ts       |  2 +-
 packages/react-router/test/server/sdk.test.ts | 20 +++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/packages/react-router/src/server/sdk.ts b/packages/react-router/src/server/sdk.ts
index 63e77a1c7901..83ccc776348a 100644
--- a/packages/react-router/src/server/sdk.ts
+++ b/packages/react-router/src/server/sdk.ts
@@ -24,7 +24,7 @@ export function getDefaultReactRouterServerIntegrations(options: NodeOptions): I
 export function init(options: NodeOptions): NodeClient | undefined {
   const opts: NodeOptions = {
     ...options,
-    defaultIntegrations: getDefaultReactRouterServerIntegrations(options),
+    defaultIntegrations: options.defaultIntegrations ?? getDefaultReactRouterServerIntegrations(options),
   };
 
   DEBUG_BUILD && debug.log('Initializing SDK...');
diff --git a/packages/react-router/test/server/sdk.test.ts b/packages/react-router/test/server/sdk.test.ts
index 4489490dce0b..acc4edd8ad2a 100644
--- a/packages/react-router/test/server/sdk.test.ts
+++ b/packages/react-router/test/server/sdk.test.ts
@@ -46,6 +46,26 @@ describe('React Router server SDK', () => {
       expect(client).not.toBeUndefined();
     });
 
+    it.each([
+      { value: 'false', defaultIntegrations: false as const },
+      { value: 'an empty array', defaultIntegrations: [] },
+    ])('disables default integrations when set to $value', ({ defaultIntegrations }) => {
+      const client = reactRouterInit({ defaultIntegrations });
+
+      expect(client?.getOptions().integrations.map(integration => integration.name)).toEqual(['SpanStreaming']);
+    });
+
+    it('replaces default integrations with a custom array', () => {
+      const integration = { name: 'CustomIntegration' };
+
+      const client = reactRouterInit({ defaultIntegrations: [integration] });
+
+      expect(client?.getOptions().integrations.map(integration => integration.name)).toEqual([
+        'CustomIntegration',
+        'SpanStreaming',
+      ]);
+    });
+
     it('adds the low quality transactions filter integration by default', () => {
       const filterSpy = vi.spyOn(LowQualityModule, 'lowQualityTransactionsFilterIntegration');