[ReactNative] Strip prefixes from NativeModules keys

Libraries/Utilities/nativeModulePrefixNormalizer.js

@@ -0,0 +1,24 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule nativeModulePrefixNormalizer
+ */
+'use strict';
+
+// Dirty hack to support old (RK) and new (RCT) native module name conventions
+function nativeModulePrefixNormalizer(modules) {
+  Object.keys(modules).forEach((moduleName) => {
+    var strippedName = moduleName.replace(/^(RCT|RK)/, '');
+    if (modules['RCT' + strippedName] && modules['RK' + strippedName]) {
+      throw new Error(
+        'Module cannot be registered as both RCT and RK: ' + moduleName
+      );
+    }
+    if (strippedName !== moduleName) {
+      modules[strippedName] = modules[moduleName];
+      delete modules[moduleName];
+    }
+  });
+}
+
+module.exports = nativeModulePrefixNormalizer;