//#region src/is-valid-passport/is-valid-passport.d.ts
/**
 * Checks if a Brazilian passport number is valid.
 * To be considered valid, the sanitized input must contain exactly two alphabetical
 * characters followed by exactly six numerical digits. The input is case-insensitive and
 * any non-alphanumeric characters (spaces, dots, hyphens, etc.) are ignored, mirroring the
 * sanitization performed by `formatPassport`/`parsePassport`.
 * This function does not verify if the input is a real passport number,
 * as there are no checksums for the Brazilian passport.
 * A number is accepted for symmetry with `formatPassport`/`parsePassport` but is never valid:
 * the decimal form of a number never starts with the two letters a passport number needs.
 *
 * @param {string|number} passport - The string containing the passport number to be checked.
 * @returns {boolean} True if the passport number is valid (2 letters followed by 6 digits).
 *
 * @example
 * isValidPassport("AB123456") // true
 * isValidPassport("ab123456") // true (case-insensitive)
 * isValidPassport("AB-123.456") // true (symbols are ignored)
 * isValidPassport("12345678") // false
 * isValidPassport("DC-221345extra") // false
 *
 * The Polícia Federal passport FAQ states the layout: "Ele é composto por duas letras - chamadas
 * de 'série', e por seis dígitos subsequentes. Por exemplo: Passaporte CS265436."
 *
 * @see Official: https://www.gov.br/pf/pt-br/assuntos/passaporte
 * @see Official: https://www.gov.br/pf/pt-br/assuntos/passaporte/ajuda/duvidas_/caderneta/caderneta-numero-onde-fica-e
 */
export declare const isValidPassport: (passport: string | number) => boolean;
//#endregion