Request bundles with excludeSource=true and sourcePaths=url-server in…

… Fusebox experiment (#44444)

Summary:

Changelog: [Internal] - Request bundles with `excludeSource=true` and `sourcePaths=url-server`.

Changes RN's bundle client to request more efficient source maps from Metro by relying on lazy-fetching of source contents.

NOTE: Requires a Metro version with D56952064 and D56952063 (not yet released on npm) to work properly.

Reviewed By: robhogan

Differential Revision: D56952065

packages/react-native/React/Base/RCTBundleURLProvider.mm

@@ -12,6 +12,8 @@
 #import "RCTDefines.h"
 #import "RCTLog.h"
 
+#import <jsinspector-modern/InspectorFlags.h>
+
 NSString *const RCTBundleURLProviderUpdatedNotification = @"RCTBundleURLProviderUpdatedNotification";
 
 const NSUInteger kRCTBundleURLProviderDefaultPort = RCT_METRO_PORT;
@@ -281,6 +283,12 @@ + (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
     [[NSURLQueryItem alloc] initWithName:@"modulesOnly" value:modulesOnly ? @"true" : @"false"],
     [[NSURLQueryItem alloc] initWithName:@"runModule" value:runModule ? @"true" : @"false"],
   ];
+  auto &inspectorFlags = facebook::react::jsinspector_modern::InspectorFlags::getInstance();
+  if (inspectorFlags.getEnableModernCDPRegistry()) {
+    queryItems = [queryItems arrayByAddingObject:[[NSURLQueryItem alloc] initWithName:@"excludeSource" value:@"true"]];
+    queryItems = [queryItems arrayByAddingObject:[[NSURLQueryItem alloc] initWithName:@"sourcePaths"
+                                                                                value:@"url-server"]];
+  }
 
   NSString *bundleID = [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString *)kCFBundleIdentifierKey];
   if (bundleID) {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java

@@ -382,17 +382,20 @@ private String createBundleURL(
       String mainModuleID, BundleType type, String host, boolean modulesOnly, boolean runModule) {
     boolean dev = getDevMode();
     return String.format(
-        Locale.US,
-        "http://%s/%s.%s?platform=android&dev=%s&lazy=%s&minify=%s&app=%s&modulesOnly=%s&runModule=%s",
-        host,
-        mainModuleID,
-        type.typeID(),
-        dev, // dev
-        dev, // lazy
-        getJSMinifyMode(),
-        mPackageName,
-        modulesOnly ? "true" : "false",
-        runModule ? "true" : "false");
+            Locale.US,
+            "http://%s/%s.%s?platform=android&dev=%s&lazy=%s&minify=%s&app=%s&modulesOnly=%s&runModule=%s",
+            host,
+            mainModuleID,
+            type.typeID(),
+            dev, // dev
+            dev, // lazy
+            getJSMinifyMode(),
+            mPackageName,
+            modulesOnly ? "true" : "false",
+            runModule ? "true" : "false")
+        + (InspectorFlags.getEnableModernCDPRegistry()
+            ? "&excludeSource=true&sourcePaths=url-server"
+            : "");
   }
 
   private String createBundleURL(String mainModuleID, BundleType type) {