/**
 * Validates an IMEI (International Mobile Equipment Identity) number, using the Luhn algorithm.
 * Checks that the IMEI is 15 digits. Any dashes, slashes, or whitespace are ignored.
 *
 * @param {string} imei - The 15-digit IMEI number as a string.
 * @returns {boolean} `true` if the IMEI is valid; `false` otherwise.
 */
export declare function isImeiValid(imei: string): boolean;
/**
 * Validates an IMEI (International Mobile Equipment Identity) number, using the Luhn algorithm.
 * Checks that the IMEI is 15 digits. Any dashes, slashes, or whitespace are ignored.
 *
 * @param {string} imei - The 15-digit IMEI number as a string.
 * @returns {boolean} `true` if the IMEI is invalid; `false` otherwise.
 */
export declare const isImeiInvalid: (imei: string) => boolean;