From eaf3f107228ec86636eac80383915ee060fbd9ab Mon Sep 17 00:00:00 2001
From: Lukas May <lukas.may@carealytix.com>
Date: Wed, 4 Feb 2026 22:20:16 +0100
Subject: [PATCH] feat(20-02): add splitLink to route subscriptions to SSE
 httpSubscriptionLink
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Replace single httpBatchLink with splitLink that routes subscription
operations to httpSubscriptionLink (SSE) while keeping queries/mutations
on httpBatchLink. No new packages needed — both exports are part of
@trpc/client v11.
---
 packages/web/src/lib/trpc.ts | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/packages/web/src/lib/trpc.ts b/packages/web/src/lib/trpc.ts
index 1da1a55..d0a6fd5 100644
--- a/packages/web/src/lib/trpc.ts
+++ b/packages/web/src/lib/trpc.ts
@@ -1,5 +1,5 @@
 import { createTRPCReact } from '@trpc/react-query';
-import { httpBatchLink } from '@trpc/client';
+import { httpBatchLink, splitLink, httpSubscriptionLink } from '@trpc/client';
 import type { AppRouter } from '@codewalk-district/shared';
 
 export const trpc = createTRPCReact<AppRouter>();
@@ -7,10 +7,10 @@ export const trpc = createTRPCReact<AppRouter>();
 export function createTRPCClient() {
   return trpc.createClient({
     links: [
-      httpBatchLink({
-        // In dev, Vite proxy forwards /trpc to backend
-        // In prod, same-origin or configured URL
-        url: '/trpc',
+      splitLink({
+        condition: (op) => op.type === 'subscription',
+        true: httpSubscriptionLink({ url: '/trpc' }),
+        false: httpBatchLink({ url: '/trpc' }),
       }),
     ],
   });