Connection management

Reviewed By: javache

Differential Revision: D5171773

fbshipit-source-id: 6421739736f732e021e85474253ab0ddb3804b0a

React/Modules/RCTDevSettings.mm

@@ -19,6 +19,7 @@
 #import "RCTBridge+Private.h"
 #import "RCTBridgeModule.h"
 #import "RCTEventDispatcher.h"
+#import "RCTInspectorDevServerHelper.h"
 #import "RCTJSCSamplingProfiler.h"
 #import "RCTLog.h"
 #import "RCTProfile.h"
@@ -160,6 +161,20 @@ RCT_EXPORT_MODULE()
   RCTAssert(_bridge == nil, @"RCTDevSettings module should not be reused");
   _bridge = bridge;
   [self _configurePackagerConnection];
+
+#if RCT_DEV
+  // we need this dispatch back to the main thread because even though this
+  // is executed on the main thread, at this point the bridge is not yet
+  // finished with its initialisation. But it does finish by the time it
+  // relinquishes control of the main thread, so only queue on the JS thread
+  // after the current main thread operation is done.
+  dispatch_async(dispatch_get_main_queue(), ^{
+    [bridge dispatchBlock:^{
+      [RCTInspectorDevServerHelper connectForContext:bridge.jsContextRef
+                                       withBundleURL:bridge.bundleURL];
+    } queue:RCTJSThread];
+  });
+#endif
 }
 
 - (dispatch_queue_t)methodQueue