How to use the win-ca.der2 function in win-ca

});
    if (err) {
      return callback(err, result);
    }

    var tlsOptions;

    if (config.LDAP_URL.toLowerCase().substr(0, 5) === 'ldaps') {

      var cas;

      if (process.platform === 'win32') {
        const ca = require('win-ca');
        cas = [];
        ca({
          format: ca.der2.pem,
          store: ['root', 'ca', 'trustedpeople'],
          ondata: cas
        });
      } else {
        cas = https.globalAgent.options.ca;
      }

      tlsOptions = {
        ca: cas
      };

      if (nconf.get('SSL_ENABLE_EMPTY_SUBJECT')) {
        // When enabled use the connector own verification function that fixes Node.js issue described in https://github.com/nodejs/node/issues/11771 for details
        tlsOptions.checkServerIdentity = tls.checkServerIdentity;
      }
    }

function readSystemCAs(cb) {
  switch(process.platform) {
    case 'win32':
      console.log('Reading CA certificates from Windows Store');
      const ca = require('win-ca');
      const list = [];
      ca({
        format: ca.der2.pem,
        store: ['root', 'ca', 'trustedpeople'],
        ondata: list
      });
      cb(null, list.map(c => ({ pem: c })));
      break;
    case 'freebsd':
    case 'linux':
      console.log('Reading CA certificates from OPENSSLDIR');
      exec('openssl version -d', function(err, stdout, stderr){
        if (err) return cb(err);

        var match = SSL_OPENSSLDIR_PATTERN.exec(stdout);
        if (match && match.length > 1) {
          return readCertficatesFromPath(path.join(match[1], 'certs'), cb);
        }