documentValidations.ts

// baseado em https://gist.github.com/joaohcrangel/8bd48bcc40b9db63bef7201143303937

export const cpf = (cpf: string) => {
  const _cpf = cpf.replace(/[\s.-]*/g, '');
  let sum = 0;
  let rest = 0;

  if (_cpf.match(/([0-9])(\d\1{9})/)?.length) return false;

  for (let i = 1; i <= 9; i += 1) {
    sum += parseInt(_cpf.substring(i - 1, i), 10) * (11 - i);
  }

  rest = (sum * 10) % 11;

  if (rest === 10 || rest === 11) rest = 0;
  if (rest !== parseInt(_cpf.substring(9, 10), 10)) return false;

  sum = 0;
  for (let i = 1; i <= 10; i += 1) {
    sum += parseInt(_cpf.substring(i - 1, i), 10) * (12 - i);
  }
  rest = (sum * 10) % 11;

  if (rest === 10 || rest === 11) rest = 0;
  if (rest !== parseInt(_cpf.substring(10, 11), 10)) return false;

  return true;
}