/**
 * Compresses an image with the given parameters.
 *
 * @param imageBuffer Buffer representation of an image.
 * @param quality Quality to apply to the image (JPEG).
 * @param maxWidth Maximum bound for width.
 * @param maxHeight Maximum bound for height.
 */
export declare function compressImage(imageBuffer: Buffer, quality?: number, maxWidth?: number | null, maxHeight?: number | null): Promise<Buffer>;