iOS: allow getting an instance of a js-bound module via the bridge

Reviewed By: sebmarkbage

Differential Revision: D6982785

fbshipit-source-id: 7bbcc5416e1d1a3a577328349a7c18af5c0f8577

React/Base/RCTBridge.h

@@ -168,6 +168,11 @@ RCT_EXTERN NSString *RCTBridgeModuleNameForClass(Class bridgeModuleClass);
  */
 - (BOOL)moduleIsInitialized:(Class)moduleClass;
 
+/**
+ * Retrieve an extra module that gets bound to the JS context, if any.
+ */
+- (id)jsBoundExtraModuleForClass:(Class)moduleClass;
+
 /**
  * All registered bridge module classes.
  */

React/Base/RCTBridge.m

@@ -251,6 +251,11 @@ RCT_NOT_IMPLEMENTED(- (instancetype)init)
   return [self.batchedBridge moduleIsInitialized:moduleClass];
 }
 
+- (id)jsBoundExtraModuleForClass:(Class)moduleClass
+{
+  return [self.batchedBridge jsBoundExtraModuleForClass:moduleClass];
+}
+
 - (void)reload
 {
   #if RCT_ENABLE_INSPECTOR