From aae3f49eec34633f7fb977e83b46057f8407c22f Mon Sep 17 00:00:00 2001
From: peterkogo <peter@xyflow.com>
Date: Tue, 1 Apr 2025 12:39:42 +0200
Subject: [PATCH 1/2] make fitView fire even when onNodesChange is not
 implmented

---
 packages/react/src/components/BatchProvider/index.tsx | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/packages/react/src/components/BatchProvider/index.tsx b/packages/react/src/components/BatchProvider/index.tsx
index 382324da..f41b79a8 100644
--- a/packages/react/src/components/BatchProvider/index.tsx
+++ b/packages/react/src/components/BatchProvider/index.tsx
@@ -42,13 +42,16 @@ export function BatchProvider<NodeType extends Node = Node, EdgeType extends Edg
 
     if (hasDefaultNodes) {
       setNodes(next);
-    } else if (onNodesChange) {
+    } else {
+      // When a controlled flow is used we need to collect the changes
       const changes = getElementsDiffChanges({
         items: next,
         lookup: nodeLookup,
       }) as NodeChange<NodeType>[];
+
+      // We only want to fire onNodesChange if there are changes to the nodes
       if (changes.length > 0) {
-        onNodesChange(changes);
+        onNodesChange?.(changes);
       } else if (fitViewQueued) {
         // If there are no changes to the nodes, we still need to call setNodes
         // to trigger a re-render and fitView.
@@ -61,6 +64,7 @@ export function BatchProvider<NodeType extends Node = Node, EdgeType extends Edg
       }
     }
   }, []);
+
   const nodeQueue = useQueue<NodeType>(nodeQueueHandler);
 
   const edgeQueueHandler = useCallback((queueItems: QueueItem<EdgeType>[]) => {

From 75ab89420e3cd0fdc34baf06eabdc50113d4de7c Mon Sep 17 00:00:00 2001
From: peterkogo <peter@xyflow.com>
Date: Tue, 1 Apr 2025 12:40:28 +0200
Subject: [PATCH 2/2] add changeset

---
 .changeset/gentle-walls-hammer.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/gentle-walls-hammer.md

diff --git a/.changeset/gentle-walls-hammer.md b/.changeset/gentle-walls-hammer.md
new file mode 100644
index 00000000..21f4f3be
--- /dev/null
+++ b/.changeset/gentle-walls-hammer.md
@@ -0,0 +1,5 @@
+---
+'@xyflow/react': patch
+---
+
+Fix fitView not working when onNodesChange is not defined.