Validate if a CNPJ is valid

Validate if a CNPJ is valid

/**
 * Validate if a CNPJ is valid.
 * @param {*} data - CNPJ
 * @param {*} cnpjBlackList - Array with blacklist of wrongs CNPJs
 * @returns {Boolean} return a boolean
 *
 * @example
 * isCnpjValid('98.080.425/0011-00'); //false
 */
export const isCnpjValid = (
  data = '',
  cnpjBlackList = [
    '00000000000000',
    '11111111111111',
    '22222222222222',
    '33333333333333',
    '44444444444444',
    '55555555555555',
    '66666666666666',
    '77777777777777',
    '88888888888888',
    '99999999999999',
  ],
) => {
  const cnpj = data.replace(/[^\d]+/g, '');
  const isDigitValid = (digit = 1, cnpj) => {
    const tamanho = digit === 1 ? 12 : 13;
    let pos = tamanho - 7;
    let numbers = cnpj.substring(0, tamanho);
    let digits = cnpj.substring(tamanho);

    let sum = 0;
    for (let i = tamanho; i >= 1; i--) {
      sum += numbers.charAt(tamanho - i) * pos--;
      if (pos < 2) pos = 9;
    }

    const result = sum % 11 < 2 ? 0 : 11 - (sum % 11);
    if (result !== parseInt(digits.charAt(0))) return false;
    return true;
  };

  if (cnpj === '' || cnpj.length !== 14 || cnpjBlackList.find(current => cnpj === current))
    return false;

  return isDigitValid(1, cnpj) && isDigitValid(2, cnpj);
};