/**
 * Centralized hook that drives overlay crossfade on UI thread.
 * Call this from DragOverlay component (mounted once).
 *
 * IMPORTANT: Only uses UI-thread signals (overlayActive, overlayReady, overlayItemId,
 * overlayRenderedOnUI). Does NOT use overlayVisible which is set from JS-thread via
 * scheduleOnRN → useEffect, causing scheduling delays that can result in visibility
 * race conditions.
 *
 * The crossfade uses INSTANT swaps (not animated) because:
 * - With correct overlay positioning (exact match to original), instant swap is imperceptible
 * - Animated fades (e.g. 50ms) caused visible flicker because the animation started before
 *   the overlay was actually painted to screen, causing the original to dim with no replacement
 *
 * The crossfade ensures:
 * 1. Overlay becomes visible instantly when ready (active + ready + has ID + rendered on UI)
 * 2. Overlay becomes invisible instantly when drag/drop ends (active goes false)
 * 3. Original item uses inverse opacity (1 - dragOverlayOpacity) for perfect crossfade
 * 4. overlayFrozenItemId keeps overlay renderable during state transitions
 * 5. Overlay state is cleared atomically on deactivation
 * 6. Swap only happens when overlayRenderedOnUI is true, preventing the original from
 *    becoming invisible before the overlay has actually rendered (the "vanish" bug fix)
 */
export declare function useOverlayCrossfade(): void;
//# sourceMappingURL=useOverlayCrossfade.d.ts.map