text: // Copyright 2020 Google LLC
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /**
   * This application demonstrates how to perform basic operations on
   * subscriptions with the Google Cloud Pub/Sub API.
   *
   * For more information, see the README.md under /pubsub and the documentation
   * at https://cloud.google.com/pubsub/docs.
   */
  
  'use strict';
  
  // sample-metadata:
  //   title: Create Subscription with ordering enabled
  //   description: Creates a new subscription with ordering enabled.
  //   usage: node createSubscriptionWithOrdering.js <topic-name> <subscription-name>
  
  function main(
    topicName = 'YOUR_TOPIC_NAME',
    subscriptionName = 'YOUR_SUBSCRIPTION_NAME'
  ) {
    // [START pubsub_enable_subscription_ordering]
    /**
     * TODO(developer): Uncomment these variables before running the sample.
     */
    // const topicName = 'YOUR_TOPIC_NAME';
    // const subscriptionName = 'YOUR_SUBSCRIPTION_NAME';
  
    // Imports the Google Cloud client library
    const {PubSub} = require('@google-cloud/pubsub');
  
    // Creates a client; cache this for further use
    const pubSubClient = new PubSub();
  
    async function createSubscriptionWithOrdering() {
      // Creates a new subscription
      await pubSubClient.topic(topicName).createSubscription(subscriptionName, {
        enableMessageOrdering: true,
      });
      console.log(
        `Created subscription ${subscriptionName} with ordering enabled.`
      );
      console.log(
        'To process messages in order, remember to add an ordering key to your messages.'
      );
    }
  
    createSubscriptionWithOrdering().catch(console.error);
    // [END pubsub_enable_subscription_ordering]
  }
  
  main(...process.argv.slice(2));
  