CPF validator JS

cpf.js

"use strict";

const blackList = [
  "00000000000",
  "11111111111",
  "22222222222",
  "33333333333",
  "44444444444",
  "55555555555",
  "66666666666",
  "77777777777",
  "88888888888",
  "99999999999",
];

const verifierDigit = digits => {
  const size = digits.length + 1;
  const mod11 = digits
    .map((digit, index) => digit * (size - index))
    .reduce((a, b) => a + b) % 11;

  return mod11 <= 1 ? 0 : 11 - mod11;
};

const validate = number => {
  number = number.toString().replace(/\D/g, "");

  if (number.length != 11 || blackList.includes(number)) return false;

  const digits = number.split("").map(digit => parseInt(digit, 10));
  const cpfDigits = digits.slice(0, 9);
  const verifierDigits = digits.slice(9, 2);

  const v1 = verifierDigit(cpfDigits);
  const v2 = verifierDigit([...cpfDigits, v1]);

  return [v1, v2].join == verifierDigits.join;
};

module.exports = validate;