import { ImageOptions } from "./types";
/**
 * Creates an image for use in the lightbox based on an input element.
 * Always returns an <img>, regardless of the input element.
 */
export declare function generateLightboxImg($img: HTMLPictureElement | HTMLImageElement, newSrc?: string): HTMLImageElement;
export declare function isValidImage($elm: HTMLElement): $elm is HTMLImageElement | HTMLPictureElement;
export declare function getHighResFromImage($image: HTMLImageElement | HTMLPictureElement, targetWidth?: number): string;
export declare function getHighestFromSrcSet(srcset: string, targetWidth?: number): {
    src: string;
    width: number;
} | null;
export declare function getSrcFromImage($elm: HTMLImageElement | HTMLPictureElement): string;
export declare function getScrollPosition(horizontal?: boolean): number;
export declare function defaultLightboxGenerator($copiedImg: HTMLElement, opts: ImageOptions, $original: HTMLElement): HTMLElement;