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node_modules/react-native/React/Fabric/Mounting/ComponentViews/UnimplementedComponent/RCTUnimplementedNativeComponentView.h

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import <UIKit/UIKit.h>
+
+#import <React/RCTViewComponentView.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RCTUnimplementedNativeComponentView : RCTViewComponentView
+
+@end
+
+NS_ASSUME_NONNULL_END

node_modules/react-native/React/Fabric/Mounting/ComponentViews/UnimplementedComponent/RCTUnimplementedNativeComponentView.mm

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import "RCTUnimplementedNativeComponentView.h"
+
+#import <react/renderer/components/FBReactNativeSpec/ComponentDescriptors.h>
+#import <react/renderer/components/FBReactNativeSpec/EventEmitters.h>
+#import <react/renderer/components/FBReactNativeSpec/Props.h>
+
+using namespace facebook::react;
+
+@implementation RCTUnimplementedNativeComponentView {
+  UILabel *_label;
+}
+
+- (instancetype)initWithFrame:(CGRect)frame
+{
+  if (self = [super initWithFrame:frame]) {
+    _props = UnimplementedNativeViewShadowNode::defaultSharedProps();
+
+    CGRect bounds = self.bounds;
+    _label = [[UILabel alloc] initWithFrame:bounds];
+    _label.backgroundColor = [UIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:0.3];
+    _label.layoutMargins = UIEdgeInsetsMake(12, 12, 12, 12);
+    _label.lineBreakMode = NSLineBreakByWordWrapping;
+    _label.numberOfLines = 0;
+    _label.textAlignment = NSTextAlignmentCenter;
+    _label.textColor = [UIColor whiteColor];
+
+    self.contentView = _label;
+  }
+
+  return self;
+}
+
+#pragma mark - RCTComponentViewProtocol
+
++ (ComponentDescriptorProvider)componentDescriptorProvider
+{
+  return concreteComponentDescriptorProvider<UnimplementedNativeViewComponentDescriptor>();
+}
+
+- (void)updateProps:(const Props::Shared &)props oldProps:(const Props::Shared &)oldProps
+{
+  const auto &oldViewProps = static_cast<const UnimplementedNativeViewProps &>(*_props);
+  const auto &newViewProps = static_cast<const UnimplementedNativeViewProps &>(*props);
+
+  if (oldViewProps.name != newViewProps.name) {
+    _label.text = [NSString stringWithFormat:@"'%s' is not Fabric compatible yet.", newViewProps.name.c_str()];
+  }
+
+  [super updateProps:props oldProps:oldProps];
+}
+
+@end