Send custom CDP Event to Frontend to prepare for displaying a trace (#53079)

hoxyq · facebook-github-bot · commit 80f340e81cba · 2025-08-22T04:12:22.000-07:00
Summary: Pull Request resolved: #53079 # Changelog: [Internal] We need this to notify Frontend, so it updates the local state before receiving `Tracing.dataCollected` events. Corresponding change in CDT fork - react/react-native-devtools-frontend#199. Reviewed By: sbuggay Differential Revision: D79672598 fbshipit-source-id: b2928cb3942e34a1f4723516ecdf5062d4331591
diff --git a/packages/react-native/ReactCommon/jsinspector-modern/TracingAgent.cpp b/packages/react-native/ReactCommon/jsinspector-modern/TracingAgent.cpp
@@ -44,6 +44,8 @@ TracingAgent::TracingAgent(
       sessionState_(sessionState),
       hostTargetController_(hostTargetController) {
   if (traceRecordingToEmit.has_value()) {
+    frontendChannel_(
+        cdp::jsonNotification("ReactNativeApplication.traceRequested"));
     emitTraceRecording(std::move(traceRecordingToEmit.value()));
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -44,6 +44,8 @@ TracingAgent::TracingAgent(`
`44`	`44`	`sessionState_(sessionState),`
`45`	`45`	`hostTargetController_(hostTargetController) {`
`46`	`46`	`if (traceRecordingToEmit.has_value()) {`
	`47`	`+ frontendChannel_(`
	`48`	`+ cdp::jsonNotification("ReactNativeApplication.traceRequested"));`
`47`	`49`	`emitTraceRecording(std::move(traceRecordingToEmit.value()));`
`48`	`50`	`}`
`49`	`51`	`}`