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 bucket and
   * file Access Control Lists 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',
    filename = 'test.txt',
    userEmail = 'jdobry@google.com'
  ) {
    // [START storage_add_file_owner]
    /**
     * TODO(developer): Uncomment the following line before running the sample.
     */
    // const bucketName = 'Name of a bucket, e.g. my-bucket';
    // const filename = 'Name of file to access, e.g. file.txt';
    // const userEmail = 'Email of user to add, e.g. developer@company.com';
  
    // Imports the Google Cloud client library
    const {Storage} = require('@google-cloud/storage');
  
    // Creates a client
    const storage = new Storage();
  
    async function addFileOwner() {
      await storage
        .bucket(bucketName)
        .file(filename)
        .acl.owners.addUser(userEmail);
  
      console.log(`Added user ${userEmail} as an owner on file ${filename}.`);
    }
  
    addFileOwner().catch(console.error);
    // [END storage_add_file_owner]
  }
  main(...process.argv.slice(2));
  