Simplify logic

Author: andreiborza

packages/core/src/tracing/langchain/utils.ts

@@ -561,21 +561,19 @@ export function _INTERNAL_mergeLangChainCallbackHandler(existing: unknown, sentr
   }
 
   if (Array.isArray(existing)) {
-    if (existing.includes(sentryHandler)) {
-      return existing;
+    if (!existing.includes(sentryHandler)) {
+      return [...existing, sentryHandler];
     }
-    return [...existing, sentryHandler];
   }
 
   if (isCallbackManager(existing)) {
-    if (existing.handlers?.includes(sentryHandler)) {
-      return existing;
+    if (!existing.handlers?.includes(sentryHandler)) {
+      const copied = existing.copy() as {
+        addHandler: (handler: unknown, inherit?: boolean) => void;
+      };
+      copied.addHandler(sentryHandler, true);
+      return copied;
     }
-    const copied = existing.copy() as {
-      addHandler: (handler: unknown, inherit?: boolean) => void;
-    };
-    copied.addHandler(sentryHandler, true);
-    return copied;
   }
 
   return existing;