import type { TransitionInteractiveState, TransitionNavigationType } from '.';
import { SharedTransitionState } from './shared-transition';
interface PlatformTransitionInteractiveState extends TransitionInteractiveState {
    transitionContext?: UIViewControllerContextTransitioning;
    propertyAnimator?: UIViewPropertyAnimator;
}
/**
 * Apply a drop shadow behind the destination view during an interactive
 * dismiss so it looks elevated above the source (Apple Music–style).
 *
 * Shadow + rounded corners can't coexist on the same CALayer on iOS — both
 * `masksToBounds = true` and `layer.mask` clip the shadow as part of the
 * compositing pipeline. So the shadow lives on a SIBLING CALayer inserted
 * below the modal's layer in its superlayer (the same pattern NS uses for
 * box-shadow via `outerShadowContainerLayer`). The modal keeps its own
 * `cornerRadius` + `masksToBounds` so subviews still clip to the rounded
 * shape.
 *
 * Because the shadow layer is a sibling (not a child), it doesn't inherit
 * the modal's transform automatically — `syncInteractiveDismissShadow`
 * mirrors transform/position/bounds during the drag.
 *
 * Falsy `shadowConfig` is a no-op.
 */
export declare function applyInteractiveDismissShadow(presentedView: any, shadowConfig: any): void;
/**
 * Mirror the modal layer's geometry onto the sibling shadow layer so the
 * shadow tracks the interactive drag. Called from the gesture handlers
 * after the modal's state has been updated (either via direct transform
 * in morph mode, or via `interactiveController.updateInteractiveTransition`
 * for the non-morph modal/page case driven by UIViewPropertyAnimator).
 *
 * Reads the layer's **presentation** values when an animation is in flight
 * — model values would point at the animation's end state and snap the
 * shadow there. Falls back to model values when no animation is running.
 */
export declare function syncInteractiveDismissShadow(presentedView: any): void;
/**
 * Remove the sibling shadow layer. Safe to call repeatedly / when no
 * shadow was applied.
 */
export declare function removeInteractiveDismissShadow(presentedView: any): void;
export declare class SharedTransitionHelper {
    static animate(state: SharedTransitionState, transitionContext: UIViewControllerContextTransitioning, type: TransitionNavigationType): void;
    static interactiveStart(state: SharedTransitionState, interactiveState: PlatformTransitionInteractiveState, type: TransitionNavigationType): void;
    static interactiveUpdate(state: SharedTransitionState, interactiveState: PlatformTransitionInteractiveState, type: TransitionNavigationType, percent: number): void;
    static interactiveCancel(state: SharedTransitionState, interactiveState: PlatformTransitionInteractiveState, type: TransitionNavigationType): void;
    static interactiveFinish(state: SharedTransitionState, interactiveState: PlatformTransitionInteractiveState, type: TransitionNavigationType): void;
}
export {};