code: function getServerConfig(aCertDir) {
      const certFileRead = readFile(aCertDir + '/serverCert.pem');
      const keyFileRead = readFile(aCertDir + '/serverKey.pem');
      return Promise.all([certFileRead, keyFileRead]).
        then(files => [{ cert: files[0], key: files[1] }]);
    }
docs: At this moment reads the cert and key as serverKey and serverCert, without password, from aCertDir.