@okta-dfuhriman/okta-auth-js/lib/oidc/util/refreshToken.ts

The Okta Auth SDK

import { RefreshToken } from '../types';
import { isAuthApiError } from '../../errors';

export function isSameRefreshToken(a: RefreshToken, b: RefreshToken) {
  return (a.refreshToken === b.refreshToken);
}

export function isRefreshTokenError(err: Error) {
  if (!isAuthApiError(err)) {
    return false;
  }

  if (!err.xhr || !err.xhr.responseJSON) {
    return false;
  }

  const { responseJSON } = err.xhr;
  if (responseJSON.error === 'invalid_grant') {
    return true;
  }

  return false;
}