import React from 'react';
export type GalleryImage = {
    /** Stable key for React lists (and for tracking the active lightbox image). */
    key: string;
    /** Public image URL once resolved; null/undefined while loading or on failure. */
    url?: string | null;
    /** Source file name, used for alt text and the failed-tile label. */
    fileName?: string;
    /** True while the image is still resolving (renders a placeholder tile). */
    loading?: boolean;
    /** True once the image failed to resolve (renders a failed tile). */
    failed?: boolean;
};
/** Generic image gallery: a single resolved image renders inline (full width,
 *  natural aspect ratio); a batch collapses into a 2-column grid. Tapping a
 *  resolved image opens a full-screen lightbox that pages through the resolved
 *  images (swipe or arrows). Loading/failed images render placeholder tiles.
 *
 *  Shared by the `send_image` tool renderer (`SendImageGallery`) and the
 *  image-attachment preview in chat messages. */
export declare function ImageGallery({ images, onOpen }: {
    images: GalleryImage[];
    onOpen?: (image: GalleryImage) => void;
}): React.JSX.Element | null;
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