code: function getFirestoreSettings(argv) {
    if (argv.local) {
      return {
        host: 'localhost:8080',
        ssl: false
      };
    } else {
      return {
        host: 'firestore.googleapis.com',
        ssl: true
      };
    }
  }
docs: If the --local argument is passed, returns a {host, ssl} FirestoreSettings
  object that point to localhost instead of production.