Move default trackingName as undefined to RCTNetworking (#51703)

Summary:
Pull Request resolved: #51703

Feedback on D75516619

Changelog: [Internal]

Reviewed By: rubennorte

Differential Revision: D75544422

fbshipit-source-id: f6c5e0090946b7861fd9cd9646e1b06b7c6a05d2

Author: javache

packages/react-native/Libraries/Network/RCTNetworking.android.js

@@ -59,7 +59,7 @@ const RCTNetworking = {
 
   sendRequest(
     method: string,
-    trackingName: ?string,
+    trackingName: string | void,
     url: string,
     headers: Object,
     data: RequestBody,

packages/react-native/Libraries/Network/RCTNetworking.ios.js

@@ -29,7 +29,7 @@ const RCTNetworking = {
 
   sendRequest(
     method: string,
-    trackingName: ?string,
+    trackingName: string | void,
     url: string,
     headers: {...},
     data: RequestBody,

packages/react-native/Libraries/Network/RCTNetworking.js.flow

@@ -25,7 +25,7 @@ declare const RCTNetworking: interface {
 
   sendRequest(
     method: string,
-    trackingName: ?string,
+    trackingName: string | void,
     url: string,
     headers: {...},
     data: RequestBody,

packages/react-native/Libraries/Network/XMLHttpRequest.js

@@ -170,7 +170,7 @@ class XMLHttpRequest extends EventTarget {
   _sent: boolean;
   _url: ?string = null;
   _timedOut: boolean = false;
-  _trackingName: string | void = undefined;
+  _trackingName: ?string;
   _incrementalEvents: boolean = false;
   _startTime: ?number = null;
   _performanceLogger: IPerformanceLogger = GlobalPerformanceLogger;
@@ -534,7 +534,7 @@ class XMLHttpRequest extends EventTarget {
   /**
    * Custom extension for tracking origins of request.
    */
-  setTrackingName(trackingName: string | void): XMLHttpRequest {
+  setTrackingName(trackingName: ?string): XMLHttpRequest {
     this._trackingName = trackingName;
     return this;
   }
@@ -632,7 +632,7 @@ class XMLHttpRequest extends EventTarget {
       );
       RCTNetworking.sendRequest(
         this._method,
-        this._trackingName,
+        this._trackingName ?? undefined,
         this._url,
         this._headers,
         data,

packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap

@@ -5916,7 +5916,7 @@ exports[`public API should not change unintentionally Libraries/Network/RCTNetwo
   ): EventSubscription,
   sendRequest(
     method: string,
-    trackingName: ?string,
+    trackingName: string | void,
     url: string,
     headers: { ... },
     data: RequestBody,
@@ -6010,7 +6010,7 @@ declare class XMLHttpRequest extends EventTarget {
   getAllResponseHeaders(): ?string;
   getResponseHeader(header: string): ?string;
   setRequestHeader(header: string, value: any): void;
-  setTrackingName(trackingName: string | void): XMLHttpRequest;
+  setTrackingName(trackingName: ?string): XMLHttpRequest;
   setPerformanceLogger(performanceLogger: IPerformanceLogger): XMLHttpRequest;
   open(method: string, url: string, async: ?boolean): void;
   send(data: any): void;