Validate SIREN/SIRET with yup

yup-schema.ts

// Luhn algorithm to validate the SIRET number
const luhnCheck = (num?: string) => {
  if (!num) {
    return false;
  }
  let arr = (num + '')
    .split('')
    .reverse()
    .map((x) => parseInt(x));
  let lastDigit = arr.splice(0, 1)[0];
  let sum = arr.reduce((acc, val, i) => (i % 2 === 0 ? acc + ((val * 2) % 9) : acc + val), 0);
  return (sum + lastDigit) % 10 === 0;
};

const schema = yup.object({
  businessRegistrationId: yup
    .string()
    .trim()
    .matches(/^[0-9]{9}$|^[0-9]{14}$/, 'Le SIRET/SIREN doit faire exactement 9 ou 14 caractères')
    .test('is-valid-siret', 'SIRET/SIREN invalide', luhnCheck)
    .required(),
})