const app = new Realm.App("awesome-app");
const user = await app.logIn(Realm.Credentials.anonymous());

const localConfig = {
  path: "local.realm",
  schema: [Person, Dog],
};

// Copies a bundled realm to "local.realm"
if (!Realm.exists(localConfig)) {
  Realm.copyBundledRealmFiles();
}

const localRealm = new Realm(localConfig);

const remoteConfig = {
  schema: [Person, Dog],
  sync: {
    user,
    partitionValue,
  },
};

if (Realm.exists(remoteConfig)) {
  return Realm.open(remoteConfig);
} else {
  localRealm.writeCopyTo(remoteConfig);
  localRealm.close();
  // Open the new remote Realm
  const syncedRealm = await Realm.open(remoteConfig);
  // Delete the old realm
  Realm.deleteFile(localConfig);
  return syncedRealm;
}

// Copies a bundled realm to "local.realm"
if (!Realm.exists({ path: "local.realm" })) {
  Realm.copyBundledRealmFiles();
}

// Automagically copies the local Realm into a synced Realm as it's opened.
const syncedRealm = await Realm.open({
  path: "local.realm",
  sync: {
    user,
    partitionValue,
  },
});