/**
 * CNPJ (Cadastro Nacional da Pessoa Jurídica) normalizer · Brasil
 *
 * Reference: Receita Federal · https://www.gov.br/receitafederal
 * Format: XX.XXX.XXX/XXXX-XX (14 digits + 2 verifier digits embedded).
 *
 * Canonical form preserves the standard punctuation as published by
 * Receita Federal in compliance with IN RFB 1.863/2018.
 */
/**
 * Normalize a Brazilian CNPJ to canonical "XX.XXX.XXX/XXXX-XX" form.
 */
export declare function normalizeCnpjBR(input: string): string;
/**
 * Verify the embedded two-digit checksum of a CNPJ per Receita Federal
 * algorithm (modulo-11 with positional weights).
 */
export declare function computeCnpjChecksumBR(digits: string): string;
/**
 * Validate the format and checksum of a Brazilian CNPJ.
 * Rejects repeated-digit edge cases (e.g. "11111111111111").
 */
export declare function isValidCnpjBR(input: string): boolean;
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