text: // Copyright 2019-2020 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
  //
  //     https://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 sample demonstrates how to perform basic operations on topics 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: Publish Message
  //   description: Publishes a message to a topic.
  //   usage: node publishMessage.js <topic-name> <data>
  
  function main(
    topicName = 'YOUR_TOPIC_NAME',
    data = JSON.stringify({foo: 'bar'})
  ) {
    // [START pubsub_publish]
    // [START pubsub_quickstart_publisher]
    /**
     * TODO(developer): Uncomment these variables before running the sample.
     */
    // const topicName = 'YOUR_TOPIC_NAME';
    // const data = JSON.stringify({foo: 'bar'});
  
    // 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 publishMessage() {
      /**
       * TODO(developer): Uncomment the following lines to run the sample.
       */
      // const topicName = 'my-topic';
  
      // Publishes the message as a string, e.g. "Hello, world!" or JSON.stringify(someObject)
      const dataBuffer = Buffer.from(data);
  
      const messageId = await pubSubClient.topic(topicName).publish(dataBuffer);
      console.log(`Message ${messageId} published.`);
    }
  
    publishMessage().catch(console.error);
    // [END pubsub_publish]
    // [END pubsub_quickstart_publisher]
  }
  
  main(...process.argv.slice(2));
  