UpdaterOptions

const updater = new Updater(source, remote, {
  channel: 'stable',
  integrityPolicy: 'strict',
  signatureVerifier: {
    algorithm: 'ed25519',
    key: {
      format: 'spkiPem',
      data: publicKeyPem,
    },
  },
});

// Custom verification functions
const updater = new Updater(source, remote, {
  integrityChecker: async (data, integrity) => {
    // Custom integrity verification
    return true;
  },
  signatureVerifier: async (data, signature) => {
    // Custom signature verification
    return true;
  },
});