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 files with
   * the Google Cloud Storage API.
   *
   * For more information, see the README.md under /storage and the documentation
   * at https://cloud.google.com/storage/docs.
   */
  
  function main(bucketName = 'my-bucket', notificationId = '1') {
    // [START storage_notifications_get_metadata]
    /**
     * TODO(developer): Uncomment the following lines before running the sample.
     */
    // The ID of your GCS bucket
    // const bucketName = 'your-unique-bucket-name';
  
    // The ID of the notification
    // const notificationId = '1';
  
    // Imports the Google Cloud client library
    const {Storage} = require('@google-cloud/storage');
  
    // Creates a client
    const storage = new Storage();
  
    async function getMetadata() {
      // Get the notification metadata
      const [metadata] = await storage
        .bucket(bucketName)
        .notification(notificationId)
        .getMetadata();
  
      console.log(`ID: ${metadata.id}`);
      console.log(`Topic: ${metadata.topic}`);
      console.log(`Event Types: ${metadata.event_types}`);
      console.log(`Custom Attributes: ${metadata.custom_attributes}`);
      console.log(`Payload Format: ${metadata.payload_format}`);
      console.log(`Object Name Prefix: ${metadata.object_name_prefix}`);
      console.log(`Etag: ${metadata.etag}`);
      console.log(`Self Link: ${metadata.selfLink}`);
      console.log(`Kind: ${metadata.kind}`);
    }
  
    getMetadata().catch(console.error);
    // [END storage_notifications_get_metadata]
  }
  main(...process.argv.slice(2));
  