Codigo JS para calcular el CUIL en base al DNI y sexo, pensado para ser usado en NODE.JS

calculate_cuil.js

const assert = require('assert');
const createError = require('http-errors');
/*
  Receive a dni and gender 'M' or 'F' and return his cuil.
  Params
    document : number -> dni
    gender : string
  Returns
    string -> cuil
*/
const calculateCUIL = (document, gender)=>{
  const HOMBRE   = ['HOMBRE', 'M','1', 'MALE', 'Masculino'];
  const MUJER    = ['MUJER', 'F','2', 'FEMALE', 'Femenino'];
  const SOCIEDAD = ['SOCIEDAD', 'S', 'SS', 'SOCIETY'];
  assert(document,createError.BadRequest());
  document = document.toString();
  assert(gender,createError.BadRequest());
  gender   = gender.toUpperCase();
  assert(!isNaN(document),createError.BadRequest());
  assert([7,8].includes(document.length),createError.BadRequest());
  assert(HOMBRE.includes(gender) || MUJER.includes(gender) || SOCIEDAD.includes(gender),createError.BadRequest());
  let AB,C;
  document = `${document.length===7 ? '0' : ''}${document}`;
  if(HOMBRE.includes(gender)) {
      AB = '20';
  } else if(MUJER.includes(gender)) {
      AB = '27';
  } else {
      AB = '30';
  }
  const multiplicadores = [3, 2, 7, 6, 5, 4, 3, 2];
  let calculo = ((parseInt(AB.charAt(0)) * 5) + (parseInt(AB.charAt(1)) * 4));
  for(let i=0;i<8;i++) {
      calculo += (parseInt(document.charAt(i)) * multiplicadores[i]);
  }
  let resto = (parseInt(calculo)) % 11;
  if( !SOCIEDAD.includes(gender) && resto==1){
      if(HOMBRE.includes(gender)){
          C = 9;
      } else {
          C = 4;
      }
      AB = '23';
  } else if(resto === 0){
      C = 0;
  } else {
      C = 11 - resto;
  }
  return `${AB}${document}${C}`;
}
module.exports = {
  calculateCUIL
}