text: // Copyright 2021 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.
  
  
  'use strict';
  
  function main(validateOnly) {
    // [START eventarc_v1_generated_Eventarc_UpdateTrigger_async]
    /**
     * TODO(developer): Uncomment these variables before running the sample.
     */
    /**
     *  The trigger to be updated.
     */
    // const trigger = ''
    /**
     *  The fields to be updated; only fields explicitly provided will be updated.
     *  If no field mask is provided, all provided fields in the request will be
     *  updated. To update all fields, provide a field mask of "*".
     */
    // const updateMask = ''
    /**
     *  If set to true, and the trigger is not found, a new trigger will be
     *  created. In this situation, `update_mask` is ignored.
     */
    // const allowMissing = true
    /**
     *  Required. If set, validate the request and preview the review, but do not actually
     *  post it.
     */
    // const validateOnly = true
  
    // Imports the Eventarc library
    const {EventarcClient} = require('@google-cloud/eventarc').v1;
  
    // Instantiates a client
    const eventarcClient = new EventarcClient();
  
    async function updateTrigger() {
      // Construct request
      const request = {
        validateOnly,
      };
  
      // Run request
      const [operation] = await eventarcClient.updateTrigger(request);
      const [response] = await operation.promise();
      console.log(response);
    }
  
    updateTrigger();
    // [END eventarc_v1_generated_Eventarc_UpdateTrigger_async]
  }
  
  process.on('unhandledRejection', err => {
    console.error(err.message);
    process.exitCode = 1;
  });
  main(...process.argv.slice(2));
  