/**
 * Generates a Gravatar icon URL for the given email address.
 *
 * @param email - The email address to generate the Gravatar icon URL for.
 * @returns The Gravatar icon URL.
 *
 * @example
 * const email = 'user@example.com';
 * const gravatarUrl = gravatarIconUrl(email);
 * console.log(gravatarUrl); // Gravatar icon URL
 */
export declare const gravatarIconUrl: (email: string) => string;