import { AbstractValidatableDocument } from '../../contracts/abstract-validatable-document.js';
import { ReasonCode } from '../../contracts/reason-code.js';
import { type DocumentMeta } from '../../contracts/validation-result.js';
/**
 * Validates Brazilian CNPJ (Cadastro Nacional da Pessoa Jurídica) numbers.
 *
 * Supports both numeric and alphanumeric CNPJ formats.
 */
export declare class CNPJValidation extends AbstractValidatableDocument {
    protected documentName(): string;
    /**
     * Generates a valid (numeric) CNPJ.
     *
     * @param formatted When true, returns the masked form (00.000.000/0000-00).
     */
    static generate(formatted?: boolean): string;
    /**
     * CNPJ keeps letters (alphanumeric format), so it cannot strip to digits only.
     * Uppercases and removes only formatting separators; other characters are
     * preserved so they are caught as invalid during validation.
     */
    protected sanitize(value: string): string;
    protected doValidate(): ReasonCode | null;
    /**
     * CNPJ metadata: whether it is a headquarters (branch marker '0001' before the
     * check digits) and whether it uses the alphanumeric format (any letter present).
     */
    protected extractMeta(normalized: string): DocumentMeta;
    /**
     * Canonical CNPJ mask: XX.XXX.XXX/XXXX-YY. Alphanumeric-aware — the first 12
     * positions may be [A-Z0-9] and only the last 2 (check digits) are numeric.
     */
    protected mask(stripped: string): string;
}