@@ -25,7 +25,6 @@
 #import "RCTJSThread.h"
 #import "RCTLog.h"
 #import "RCTModuleData.h"
-#import "RCTPausedInDebuggerOverlayController.h"
 #import "RCTPerformanceLogger.h"
 #import "RCTProfile.h"
 #import "RCTReloadCommand.h"
 
@@ -0,0 +1,73 @@
+/*
+ * 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>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * A floating capsule at the top of the screen, in a window of its own above the app, for messages shown during
+ * development. It centers where a system alert would, keeps clear of the safe area and of a foldable's hinge, and
+ * animates in and out. Banners stack: while several are visible, each sits below those with a lower stack level.
+ * The dev loading banner is one; each instance hosts one capsule at a time, and subclasses shape theirs through the
+ * hooks below.
+ */
+@interface RCTDevBanner : NSObject
+
+/** Whether the capsule is on screen or animating out. Main queue only. */
+@property (nonatomic, readonly, getter=isVisible) BOOL visible;
+
+/** Shows the message, replacing any capsule already on screen. Callable from any thread. */
+- (void)showMessage:(NSString *)message
+              color:(UIColor *)color
+    backgroundColor:(UIColor *)backgroundColor
+      dismissButton:(BOOL)dismissButton;
+
+/** Replaces the text of the capsule on screen, for updates that arrive quickly such as progress. Main queue only. */
+- (void)updateMessage:(NSString *)message;
+
+/** Animates the capsule out, after it has been on screen long enough to read. Callable from any thread. */
+- (void)hide;
+
+@end
+
+/**
+ * Hooks for subclasses, each with the loading banner's behavior by default. All run on the main queue.
+ */
+@interface RCTDevBanner (Subclassing)
+
+/** The level of the banner's window. */
+- (UIWindowLevel)windowLevel;
+
+/** Whether the window dims the app beneath the capsule and swallows touches on it. */
+- (BOOL)dimsBackground;
+
+/** Banners with a lower level stack above those with a higher one. */
+- (NSUInteger)stackLevel;
+
+/** The capsule's minimum height. */
+- (CGFloat)minimumHeight;
+
+/** The space between the capsule's edges and its label, or its leading accessory view where there is one. */
+- (NSDirectionalEdgeInsets)labelInsets;
+
+/** A view shown before the label, such as an icon, sized by its own constraints; nil for none. Called once per capsule.
+ */
+- (nullable UIView *)makeLeadingAccessoryView;
+
+/** The label's text for a message. */
+- (NSAttributedString *)attributedTextForMessage:(NSString *)message textColor:(UIColor *)textColor;
+
+/** The capsule's accessibility label, or nil to expose its subviews instead. */
+- (nullable NSString *)accessibilityLabelForMessage:(NSString *)message;
+
+/** What a tap on the capsule does. */
+- (void)didTapCapsule;
+
+@end
+
+NS_ASSUME_NONNULL_END