/**
 * Get the thumbnail query string for an image source
 * @param src Image source
 * @param width Width of the thumbnail (0 if you when to keep the aspect ratio and only set the height)
 * @param height Height of the thumbnail (0 if you when to keep the aspect ratio and only set the width)
 * @returns Image source with the thumbnail query string
 */
export declare function getThumbnail(src: string, width?: number, height?: number): string;