From 8ac0ccbb910c2d84019761ec80a33478f124a133 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rub=C3=A9n=20Norte?= <rubennorte@meta.com>
Date: Tue, 3 Jun 2025 02:42:38 -0700
Subject: [PATCH] Add tracing section for event loop tick work for
 IntersectionObserver (#51744)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/51744

Changelog: [internal]

TSIA

Reviewed By: rshest

Differential Revision: D75789346

fbshipit-source-id: fa32cd3e5d9809bcbad48f0a6f1706efcce34d7f
---
 .../intersection/IntersectionObserverManager.cpp         | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/packages/react-native/ReactCommon/react/renderer/observers/intersection/IntersectionObserverManager.cpp b/packages/react-native/ReactCommon/react/renderer/observers/intersection/IntersectionObserverManager.cpp
index 09ff825453c..fdc4af7d5f6 100644
--- a/packages/react-native/ReactCommon/react/renderer/observers/intersection/IntersectionObserverManager.cpp
+++ b/packages/react-native/ReactCommon/react/renderer/observers/intersection/IntersectionObserverManager.cpp
@@ -243,6 +243,12 @@ void IntersectionObserverManager::updateIntersectionObservations(
   // In those cases it is ok to dispatch the notifications now, because the
   // current state is already accurate.
 
+  if (observersPendingInitialization_.empty()) {
+    return;
+  }
+
+  TraceSection s("IntersectionObserverManager::updateIntersectionObservations");
+
   std::unordered_map<SurfaceId, RootShadowNode::Shared> rootShadowNodeCache;
 
   for (auto observer : observersPendingInitialization_) {
@@ -297,7 +303,8 @@ void IntersectionObserverManager::updateIntersectionObservations(
     SurfaceId surfaceId,
     const RootShadowNode* rootShadowNode,
     HighResTimeStamp time) {
-  TraceSection s("IntersectionObserverManager::updateIntersectionObservations");
+  TraceSection s(
+      "IntersectionObserverManager::updateIntersectionObservations(mount)");
 
   std::vector<IntersectionObserverEntry> entries;