From 3fb11eed9a166ebab23b778662f54c449fcffad0 Mon Sep 17 00:00:00 2001
From: Timothy Yung <yungsters@fb.com>
Date: Wed, 17 Mar 2021 13:46:43 -0700
Subject: [PATCH] React Native: Touch Instrumentation Interface (#21024)

---
 .../src/legacy-events/ResponderTouchHistoryStore.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/packages/react-native-renderer/src/legacy-events/ResponderTouchHistoryStore.js b/packages/react-native-renderer/src/legacy-events/ResponderTouchHistoryStore.js
index 643e2c130a..24d35b52a4 100644
--- a/packages/react-native-renderer/src/legacy-events/ResponderTouchHistoryStore.js
+++ b/packages/react-native-renderer/src/legacy-events/ResponderTouchHistoryStore.js
@@ -184,8 +184,21 @@ function printTouchBank(): string {
   return printed;
 }
 
+let instrumentationCallback: ?(string, TouchEvent) => void;
+
 const ResponderTouchHistoryStore = {
+  /**
+   * Registers a listener which can be used to instrument every touch event.
+   */
+  instrument(callback: (string, TouchEvent) => void): void {
+    instrumentationCallback = callback;
+  },
+
   recordTouchTrack(topLevelType: string, nativeEvent: TouchEvent): void {
+    if (instrumentationCallback != null) {
+      instrumentationCallback(topLevelType, nativeEvent);
+    }
+
     if (isMoveish(topLevelType)) {
       nativeEvent.changedTouches.forEach(recordTouchMove);
     } else if (isStartish(topLevelType)) {