/**
 * Attaches pinch-zoom gesture to a target element.
 * Uses PointerEvents (unified API covering touch, pen, mouse).
 * @param target Element to attach the gesture to
 * @param onZoom Callback with scale delta relative to initial pinch distance
 * @returns Cleanup function
 */
export declare function attachPinchZoom(target: HTMLElement, onZoom: (scaleDelta: number) => void): () => void;
/**
 * Attaches horizontal swipe detection to a target element.
 * Emits "left" or "right" when a horizontal swipe is detected.
 * @param target Element to attach the gesture to
 * @param onSwipe Callback with swipe direction
 * @returns Cleanup function
 */
export declare function attachSwipe(target: HTMLElement, onSwipe: (direction: "left" | "right") => void): () => void;
/**
 * Attaches double-tap detection to a target element.
 * Only fires for touch/pen (not mouse). Two taps within 300ms on the same point.
 * @param target Element to attach the gesture to
 * @param onDoubleTap Callback fired on double-tap
 * @returns Cleanup function
 */
export declare function attachDoubleTap(target: HTMLElement, onDoubleTap: () => void): () => void;
/**
 * Attaches downward swipe detection (for swipe-to-close fullscreen).
 * Only fires for touch/pen. Vertical swipe > 80px with more vertical than horizontal motion.
 * @param target Element to attach the gesture to
 * @param onSwipeDown Callback fired on downward swipe
 * @returns Cleanup function
 */
export declare function attachSwipeDown(target: HTMLElement, onSwipeDown: () => void): () => void;
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