Added lightweight generic annotations

Summary: public

Added lightweight genarics annotations to make the code more readable and help the compiler catch bugs.

Fixed some type bugs and improved bridge validation in a few places.

Reviewed By: javache

Differential Revision: D2600189

fb-gh-sync-id: f81e22f2cdc107bf8d0b15deec6d5b83aacc5b56

Libraries/RCTTest/RCTTestRunner.h

@@ -22,6 +22,8 @@
                 referenceDirectory:@FB_REFERENCE_IMAGE_DIR \
                     moduleProvider:(moduleProvider__)]
 
+@protocol RCTBridgeModule;
+
 @interface RCTTestRunner : NSObject
 
 @property (nonatomic, assign) BOOL recordMode;
@@ -37,7 +39,7 @@
  */
 - (instancetype)initWithApp:(NSString *)app
          referenceDirectory:(NSString *)referenceDirectory
-             moduleProvider:(NSArray *(^)(void))block NS_DESIGNATED_INITIALIZER;
+             moduleProvider:(NSArray<id<RCTBridgeModule>> *(^)(void))block NS_DESIGNATED_INITIALIZER;
 
 /**
  * Simplest runTest function simply mounts the specified JS module with no