Explicitly set default values for fields of ResourceTimingData

packages/react-native/ReactCommon/jsinspector-modern/HostTarget.h

@@ -44,12 +44,12 @@ class HostTarget;
 class HostTargetTraceRecording;
 
 struct HostTargetMetadata {
-  std::optional<std::string> appDisplayName;
-  std::optional<std::string> appIdentifier;
-  std::optional<std::string> deviceName;
+  std::optional<std::string> appDisplayName{};
+  std::optional<std::string> appIdentifier{};
+  std::optional<std::string> deviceName{};
   std::optional<std::string> integrationName;
-  std::optional<std::string> platform;
-  std::optional<std::string> reactNativeVersion;
+  std::optional<std::string> platform{};
+  std::optional<std::string> reactNativeVersion{};
 };
 
 /**

packages/react-native/ReactCommon/jsinspector-modern/NetworkIOAgent.h

@@ -40,10 +40,10 @@ struct ReadStreamParams {
 
 struct NetworkResource {
   bool success{};
-  std::optional<std::string> stream;
-  std::optional<uint32_t> httpStatusCode;
-  std::optional<std::string> netErrorName;
-  std::optional<Headers> headers;
+  std::optional<std::string> stream{};
+  std::optional<uint32_t> httpStatusCode{};
+  std::optional<std::string> netErrorName{};
+  std::optional<Headers> headers{};
   folly::dynamic toDynamic() const {
     auto dynamicResource = folly::dynamic::object("success", success);
 

packages/react-native/ReactCommon/jsinspector-modern/tracing/TraceEvent.h

@@ -31,7 +31,7 @@ struct TraceEvent {
    * Optional. Serialized as a string, usually is hexadecimal number.
    * https://github.com/ChromeDevTools/devtools-frontend/blob/99a9104ae974f8caa63927e356800f6762cdbf25/front_end/models/trace/helpers/Trace.ts#L198-L201
    */
-  std::optional<uint32_t> id;
+  std::optional<uint32_t> id{};
 
   /** The name of the event, as displayed in the Trace Viewer. */
   std::string name;
@@ -59,7 +59,7 @@ struct TraceEvent {
    * The scope of the event, either global (g), process (p), or thread (t).
    * Only applicable to instant events ("ph": "i").
    */
-  std::optional<char> s;
+  std::optional<char> s{};
 
   /** The ID for the thread that output this event. */
   ThreadId tid;
@@ -71,7 +71,7 @@ struct TraceEvent {
    * The duration of the event, in microseconds (µs). Only applicable to
    * complete events ("ph": "X").
    */
-  std::optional<HighResDuration> dur;
+  std::optional<HighResDuration> dur{};
 };
 
 } // namespace facebook::react::jsinspector_modern::tracing

packages/react-native/ReactCommon/react/networking/NetworkReporter.h

@@ -27,14 +27,14 @@ namespace facebook::react {
  * reporting.
  */
 struct ResourceTimingData {
-  std::string url;
-  HighResTimeStamp fetchStart;
-  HighResTimeStamp requestStart;
-  std::optional<HighResTimeStamp> connectStart;
-  std::optional<HighResTimeStamp> connectEnd;
-  std::optional<HighResTimeStamp> responseStart;
+  std::string url{};
+  HighResTimeStamp fetchStart{};
+  HighResTimeStamp requestStart{};
+  std::optional<HighResTimeStamp> connectStart{};
+  std::optional<HighResTimeStamp> connectEnd{};
+  std::optional<HighResTimeStamp> responseStart{};
   int responseStatus = 0;
-  std::string contentType;
+  std::string contentType{};
   int encodedBodySize = 0;
   int decodedBodySize = 0;
 };

packages/react-native/ReactCommon/react/runtime/ReactInstance.h

@@ -40,7 +40,7 @@ class ReactInstance final : private jsinspector_modern::InstanceTargetDelegate {
 
   struct JSRuntimeFlags {
     bool isProfiling = false;
-    const std::string runtimeDiagnosticFlags;
+    const std::string runtimeDiagnosticFlags = {};
   };
 
   void initializeRuntime(