Validate norwegian organization number with javascript

validate.js

// validate org number according to https://www.brreg.no/om-oss/oppgavene-vare/alle-registrene-vare/om-enhetsregisteret/organisasjonsnummeret/
function validateNorwegianOrgNumber(rawNumber: string): boolean {
  if (
    rawNumber == null ||
    rawNumber.trim().length !== 9 ||
    !/^\d*$/.test(rawNumber.trim())
  )
    return false;
  const numbers = rawNumber.trim();
  const controlNumbers = [3, 2, 7, 6, 5, 4, 3, 2];
  const sum = rawNumber
    .substr(0, 8)
    .split("")
    .map((v, i) => parseInt(v, 10) * controlNumbers[i])
    .reduce((acc, value) =>  acc + value );

  return 11 - (sum % 11) === parseInt(numbers.charAt(8), 10);
}