feat: merge serializationAdapters from createStart getOptions and router.options

Author: phryneas

packages/start-client-core/src/client/hydrateStart.ts

@@ -25,7 +25,10 @@ export async function hydrateStart(): Promise<AnyRouter> {
   }
 
   serializationAdapters.push(ServerFunctionSerializationAdapter)
-  router.options.serializationAdapters = serializationAdapters
+  router.options.serializationAdapters = [
+    ...serializationAdapters,
+    ...(router.options?.serializationAdapters || []),
+  ]
 
   if (!router.state.matches.length) {
     await hydrate(router)

packages/start-server-core/src/createStartHandler.ts

@@ -168,7 +168,10 @@ export function createStartHandler<TRegister = Register>(
         origin,
         ...{
           defaultSsr: startOptions.defaultSsr,
-          serializationAdapters: startOptions.serializationAdapters,
+          serializationAdapters: [
+            ...(startOptions.serializationAdapters || []),
+            ...(router?.options?.serializationAdapters || []),
+          ],
         },
       })
       return router