Try static view config if native view config is not available (#44065)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/44065

React Native will try to use static view config if native view config is not available.
This will allow Fabric-only native components in Bridge mode.

Changelog: [General][Added] - Add support for Fabric-only native components in Bridge mode.

Reviewed By: cortinico

Differential Revision: D56062759

fbshipit-source-id: e562700695c14c88d11056aec1e66f8aa10a3957

packages/react-native/Libraries/NativeComponent/NativeComponentRegistry.js

@@ -62,14 +62,21 @@ export function get<Config>(
 
     let viewConfig;
     if (native) {
-      viewConfig = getNativeComponentAttributes(name);
+      viewConfig =
+        getNativeComponentAttributes(name) ??
+        createViewConfig(viewConfigProvider());
     } else {
-      viewConfig = createViewConfig(viewConfigProvider());
-      if (viewConfig == null) {
-        viewConfig = getNativeComponentAttributes(name);
-      }
+      viewConfig =
+        createViewConfig(viewConfigProvider()) ??
+        getNativeComponentAttributes(name);
     }
 
+    invariant(
+      viewConfig != null,
+      'NativeComponentRegistry.get: both static and native view config are missing for native component "%s".',
+      name,
+    );
+
     if (verify) {
       const nativeViewConfig = native
         ? viewConfig

packages/react-native/Libraries/ReactNative/getNativeComponentAttributes.js

@@ -19,17 +19,14 @@ const matricesDiffer = require('../Utilities/differ/matricesDiffer');
 const pointsDiffer = require('../Utilities/differ/pointsDiffer');
 const sizesDiffer = require('../Utilities/differ/sizesDiffer');
 const UIManager = require('./UIManager');
-const invariant = require('invariant');
 const nullthrows = require('nullthrows');
 
 function getNativeComponentAttributes(uiViewClassName: string): any {
   const viewConfig = UIManager.getViewManagerConfig(uiViewClassName);
 
-  invariant(
-    viewConfig != null && viewConfig.NativeProps != null,
-    'requireNativeComponent: "%s" was not found in the UIManager.',
-    uiViewClassName,
-  );
+  if (viewConfig == null) {
+    return null;
+  }
 
   // TODO: This seems like a whole lot of runtime initialization for every
   // native component that can be either avoided or simplified.