/**
 * Determine the release number of the wayback item that precedes a given input release number
 * in a sequence of World Imagery Wayback releases.
 *
 * @param releaseNumber The release number of a specific wayback item to check for the preceding release
 * @returns The release number of the wayback item that was released immediately before the input release
 *          number. Returns null if no preceding wayback item exists or if the input is invalid.
 */
export declare const getPreviouseReleaseNumber: (releaseNumber: number) => Promise<number | null>;
export type IResponseGetImageData = {
    releaseNumber: number;
    data: Uint8Array;
};
/**
 * Retrieves image data from the specified URL as an arraybuffer.
 * @param imageUrl - The URL of the image to fetch
 * @param releaseNumber - The release number associated with the image
 * @returns A promise that resolves to an object containing the release number and image data as a Uint8Array.
 *          If the request fails, returns an empty Uint8Array.
 */
export declare const getImageData: (imageUrl: string, releaseNumber: number) => Promise<IResponseGetImageData>;