export declare abstract class GalleryItem {
    /**
     * Media url
     */
    src: string;
    /**
     * Url of media thumbnail
     */
    thumbSrc: string;
    /**
     * Alt text for not yet loaded image
     */
    alt: string;
    /**
     * Description that is to be shown on the currently displayed gallery item
     */
    description: string;
    /**
     * Custom data where you can put whatever you want
     */
    data: any;
    constructor(
    /**
     * Media url
     */
    src: string, 
    /**
     * Url of media thumbnail
     */
    thumbSrc: string, 
    /**
     * Alt text for not yet loaded image
     */
    alt: string, 
    /**
     * Description that is to be shown on the currently displayed gallery item
     */
    description: string, 
    /**
     * Custom data where you can put whatever you want
     */
    data: any);
}
/**
 * The whole interface mirrors <source> attributes from the WHATWG spec.
 */
export interface PictureSource {
    /**
     * src URL
     */
    srcset: string;
    /**
     * CSS media selector
     */
    media?: string;
    /**
     * Give hint to browser which src from srcset to pick
     */
    sizes?: string;
    /**
     * MIME media type
     */
    type?: string;
}
export declare class GalleryImage extends GalleryItem {
    /**
     * Sources for <picture>
     */
    pictureSources?: PictureSource[];
    constructor(src: any, thumbSrc?: any, alt?: any, description?: any, 
    /**
     * Sources for <picture>
     */
    pictureSources?: PictureSource[], data?: any);
}
export declare class GalleryVideo extends GalleryItem {
    constructor(src: any, thumbSrc?: any, alt?: any, description?: any, data?: any);
}
export interface GalleryItemEvent {
    /**
     * Index of the item
     */
    index: number;
    item: GalleryItem;
    /**
     * DOM event
     */
    event: Event;
}
export interface GalleryItemInternal extends GalleryImage, GalleryVideo {
    /**
     * Marks item as loaded once its media gets loaded
     */
    _loaded?: boolean;
    /**
     * `true` when media couldn't be loaded
     */
    _failed?: boolean;
    /**
     * `true` when thumbnail couldn't be loaded
     */
    _thumbFailed?: boolean;
}
export declare const isVideo: (item: GalleryItem) => boolean;