Add support for exporting Swift modules

React/Base/RCTBridgeModule.h

@@ -31,6 +31,64 @@ typedef void (^RCTResponseSenderBlock)(NSArray *response);
  */
 @property (nonatomic, weak) RCTBridge *bridge;
 
+/**
+ * Use this macro in a private Objective-C implementation file to automatically
+ * register an external module with the bridge when it loads. This allows you to
+ * register Swift or private Objective-C classes with the bridge.
+ *
+ * For example if one wanted to export a Swift class to the bridge:
+ *
+ *   MyModule.swift:
+ *
+ *       @objc(MyModule) class MyModule: NSObject {
+ *   
+ *        @objc func doSomething(string: String! withA a: Int, andB b: Int) { ... }
+ *
+ *       }
+ *
+ *   MyModuleExport.m:
+ *
+ *      #import "RCTBridgeModule.h"
+ *
+ *      @interface RCT_EXTERN_MODULE(MyModule, NSObject)
+ *
+ *      RCT_EXTERN_METHOD(doSomething:(NSString *)string withA:(NSInteger)a andB:(NSInteger)b)
+ *
+ *      @end
+ *
+ *  this will now expose MyModule and the method to JavaScript via `NativeModules.MyModule.doSomething`
+ */
+#define RCT_EXTERN_MODULE(objc_name, objc_supername) \
+  RCT_EXTERN_REMAP_MODULE(, objc_name, objc_supername)
+
+/**
+ * Similar to RCT_EXTERN_MODULE but allows setting a custom JavaScript name
+ */
+#define RCT_EXTERN_REMAP_MODULE(js_name, objc_name, objc_supername) \
+  objc_name : objc_supername \
+  @end \
+  @interface objc_name (RCTExternModule) <RCTBridgeModule> \
+  @end \
+  @implementation objc_name (RCTExternModule) \
+  RCT_EXPORT_MODULE(js_name)
+
+/**
+ * Use this macro in accordance with RCT_EXTERN_MODULE to export methods
+ * of an external module.
+ */
+#define RCT_EXTERN_METHOD(method) \
+  RCT_EXTERN_REMAP_METHOD(, method)
+
+/**
+ * Similar to RCT_EXTERN_REMAP_METHOD but allows setting a custom JavaScript name
+ */
+#define RCT_EXTERN_REMAP_METHOD(js_name, method) \
+  - (void)__rct_export__##method { \
+    __attribute__((used, section("__DATA,RCTExport"))) \
+    __attribute__((__aligned__(1))) \
+    static const char *__rct_export_entry__[] = { __func__, #method, #js_name }; \
+  }
+
 /**
  * Place this macro in your class implementation to automatically register
  * your module with the bridge when it loads. The optional js_name argument
@@ -73,11 +131,7 @@ typedef void (^RCTResponseSenderBlock)(NSArray *response);
  * { ... }
  */
 #define RCT_REMAP_METHOD(js_name, method) \
-  - (void)__rct_export__##method { \
-    __attribute__((used, section("__DATA,RCTExport"))) \
-    __attribute__((__aligned__(1))) \
-    static const char *__rct_export_entry__[] = { __func__, #method, #js_name }; \
-  } \
+  RCT_EXTERN_REMAP_METHOD(js_name, method) \
   - (void)method
 
 /**