/**
 * NIT (Número de Identificación Tributaria) normalizer · Colombia
 *
 * Reference: DIAN · Orden Administrativa 4 de 1989
 *   · https://www.dian.gov.co
 * Format: 9-digit body + "-" + 1-digit verification digit (DV).
 *
 * Canonical form: digits-only body + "-" + verifier (0-9).
 * The DV is computed using DIAN's modulo-11 algorithm with the fixed
 * weight sequence [41, 37, 29, 23, 19, 17, 13, 7, 3] applied left-to-right.
 *
 * Example: NIT 890903938 → DV 8 → "890903938-8" (Bancolombia S.A.).
 */
/**
 * Normalize a Colombian NIT to canonical "XXXXXXXXX-X" form.
 * Accepts inputs like "890.903.938-8", "8909039388", "890903938-8".
 *
 * @throws Error if the input cannot be parsed.
 */
export declare function normalizeNitCO(input: string): string;
/**
 * Compute the canonical NIT verifier digit using the DIAN modulo-11
 * algorithm with weights [41, 37, 29, 23, 19, 17, 13, 7, 3].
 *
 * The weights are applied left-to-right against the NIT body (right-padded
 * with leading zeros to length 9 when the body has fewer than 9 digits).
 */
export declare function computeVerifierDigitCO(body: string): string;
/**
 * Validate that a string is a syntactically correct Colombian NIT with a
 * matching verification digit.
 */
export declare function isValidNitCO(input: string): boolean;
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