Make nativeFabricUIManager optional

Author: sammy-SC

packages/react-native-renderer/src/ReactFabric.js

@@ -47,7 +47,7 @@ import getComponentNameFromType from 'shared/getComponentNameFromType';
 const {
   dispatchCommand: fabricDispatchCommand,
   sendAccessibilityEvent: fabricSendAccessibilityEvent,
-} = nativeFabricUIManager;
+} = global.nativeFabricUIManager ? global.nativeFabricUIManager : {};
 
 const ReactCurrentOwner = ReactSharedInternals.ReactCurrentOwner;
 

packages/react-native-renderer/src/ReactFabricGlobalResponderHandler.js

@@ -10,7 +10,9 @@
 // Module provided by RN:
 import {UIManager} from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';
 
-const {setIsJSResponder} = nativeFabricUIManager;
+const {setIsJSResponder} = global.nativeFabricUIManager
+  ? global.nativeFabricUIManager
+  : {};
 
 const ReactFabricGlobalResponderHandler = {
   onChange: function(from: any, to: any, blockNativeResponder: boolean) {

packages/react-native-renderer/src/ReactNativeFiberInspector.js

@@ -26,7 +26,9 @@ if (__DEV__) {
   Object.freeze(emptyObject);
 }
 
-const {measure, findNodeAtPoint} = nativeFabricUIManager;
+const {measure, findNodeAtPoint} = global.nativeFabricUIManager
+  ? global.nativeFabricUIManager
+  : {};
 
 let createHierarchy;
 let getHostNode;

packages/react-native-renderer/src/ReactNativeRenderer.js

@@ -52,7 +52,7 @@ const ReactCurrentOwner = ReactSharedInternals.ReactCurrentOwner;
 const {
   sendAccessibilityEvent: fabricSendAccessibilityEvent,
   dispatchCommand: fabricDispatchCommand,
-} = nativeFabricUIManager;
+} = global.nativeFabricUIManager ? global.nativeFabricUIManager : {};
 
 function findHostInstance_DEPRECATED(
   componentOrHandle: any,