/**
 * Basic validations of the format of a Chilean RUT (Rol Único Tributario).
 * Checks if the RUT is a string, does not start with zero, and follows the correct numeric format.
 * Throws an error if the RUT is invalid.
 *
 * @param {string} rut - The RUT to validate.
 * @throws {Error} If the RUT is not a string.
 * @throws {Error} If the RUT starts with zero.
 * @throws {Error} If the RUT does not match the expected format.
 */
export declare const formatValidations: (rut: string) => void;
/**
 * Validates the format of a Chilean RUT (Rol Único Tributario).
 * @param {string} rut - The RUT to validate.
 * @returns {boolean} True if the format is valid, false otherwise.
 */
export declare const isValidFormatWithOutDash: (rut: string) => boolean;
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