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node_modules/react-native/React/Fabric/Mounting/ComponentViews/UnimplementedView/RCTUnimplementedViewComponentView.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
+
+/*
+ * UIView class for all kinds of <UnimplementedView> components.
+ */
+@interface RCTUnimplementedViewComponentView : RCTViewComponentView
+
+@end
+
+NS_ASSUME_NONNULL_END

node_modules/react-native/React/Fabric/Mounting/ComponentViews/UnimplementedView/RCTUnimplementedViewComponentView.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 "RCTUnimplementedViewComponentView.h"
+
+#import <react/renderer/components/FBReactNativeSpec/ComponentDescriptors.h>
+#import <react/renderer/components/FBReactNativeSpec/EventEmitters.h>
+#import <react/renderer/components/FBReactNativeSpec/Props.h>
+
+#import <react/renderer/components/unimplementedview/UnimplementedViewComponentDescriptor.h>
+#import <react/renderer/components/unimplementedview/UnimplementedViewShadowNode.h>
+
+#import <React/RCTConversions.h>
+
+#import "RCTFabricComponentsPlugins.h"
+
+using namespace facebook::react;
+
+@implementation RCTUnimplementedViewComponentView {
+  UILabel *_label;
+}
+
+- (instancetype)initWithFrame:(CGRect)frame
+{
+  if (self = [super initWithFrame:frame]) {
+    _props = UnimplementedViewShadowNode::defaultSharedProps();
+
+    _label = [[UILabel alloc] initWithFrame:self.bounds];
+    _label.backgroundColor = [UIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:0.3];
+    _label.lineBreakMode = NSLineBreakByCharWrapping;
+    _label.numberOfLines = 0;
+    _label.textAlignment = NSTextAlignmentCenter;
+    _label.textColor = [UIColor whiteColor];
+    _label.allowsDefaultTighteningForTruncation = YES;
+    _label.adjustsFontSizeToFitWidth = YES;
+
+    self.contentView = _label;
+  }
+
+  return self;
+}
+
+#pragma mark - RCTComponentViewProtocol
+
++ (ComponentDescriptorProvider)componentDescriptorProvider
+{
+  return concreteComponentDescriptorProvider<UnimplementedViewComponentDescriptor>();
+}
+
+- (void)updateProps:(const Props::Shared &)props oldProps:(const Props::Shared &)oldProps
+{
+  const auto &oldUnimplementedViewProps = static_cast<const UnimplementedViewProps &>(*_props);
+  const auto &newUnimplementedViewProps = static_cast<const UnimplementedViewProps &>(*props);
+
+  if (oldUnimplementedViewProps.getComponentName() != newUnimplementedViewProps.getComponentName()) {
+    _label.text =
+        [NSString stringWithFormat:@"Unimplemented component: <%s>", newUnimplementedViewProps.getComponentName()];
+  }
+
+  [super updateProps:props oldProps:oldProps];
+}
+
+@end
+
+Class<RCTComponentViewProtocol> RCTUnimplementedNativeViewCls(void)
+{
+  return RCTUnimplementedViewComponentView.class;
+}