How to use the @google-cloud/common.streamRouter function in @google-cloud/common

* @type {module:common/service-object}
 * @private
 */
var ServiceObject = common.ServiceObject;

/**
 * @type {module:compute/subnetwork}
 * @private
 */
var Subnetwork = require('./subnetwork.js');

/**
 * @type {module:common/stream-router}
 * @private
 */
var streamRouter = common.streamRouter;

/*! Developer Documentation
 *
 * @param {module:compute} compute - Compute object this region belongs to.
 * @param {string} name - Name of the region.
 */
/**
 * A Region object allows you to interact with a Google Compute Engine region.
 *
 * @resource [Regions & Zones Overview]{@link https://cloud.google.com/compute/docs/zones}
 * @resource [Region Resource]{@link https://cloud.google.com/compute/docs/reference/v1/regions}
 *
 * @constructor
 * @alias module:compute/region
 *
 * @example

var common = require('@google-cloud/common');
var extend = require('extend');
var is = require('is');
var nodeutil = require('util');

/**
 * @type {module:common/service-object}
 * @private
 */
var ServiceObject = common.ServiceObject;

/**
 * @type {module:common/stream-router}
 * @private
 */
var streamRouter = common.streamRouter;

/**
 * @type {module:common/util}
 * @private
 */
var util = common.util;

/*! Developer Documentation
 *
 * @param {module:compute/zone} zone - Zone object this instance group belongs
 *     to.
 * @param {string} name - Name of the instance group.
 */
/**
 * You can create and manage groups of virtual machine instances so that you
 * don't have to individually control each instance in your project.

* @type {module:compute/operation}
 * @private
 */
var Operation = require('./operation.js');

/**
 * @type {module:common/service-object}
 * @private
 */
var ServiceObject = common.ServiceObject;

/**
 * @type {module:common/stream-router}
 * @private
 */
var streamRouter = common.streamRouter;

/**
 * @type {module:compute/vm}
 * @private
 */
var VM = require('./vm.js');

/*! Developer Documentation
 *
 * @param {module:compute} compute - Compute object this zone belongs to.
 * @param {string} name - Name of the zone.
 */
/**
 * A Zone object allows you to interact with a Google Compute Engine zone.
 *
 * @resource [Regions & Zones Overview]{@link https://cloud.google.com/compute/docs/zones}

var extend = require('extend');
var is = require('is');
var nodeutil = require('util');
var PKG = require('../package.json');

/**
 * @type {module:common/service}
 * @private
 */
var Service = common.Service;

/**
 * @type {module:common/stream-router}
 * @private
 */
var streamRouter = common.streamRouter;

/**
 * @type {module:common/util}
 * @private
 */
var util = common.util;

/**
 * @type {module:dns/zone}
 * @private
 */
var Zone = require('./zone.js');

/**
 * [Google Cloud DNS](https://cloud.google.com/dns/what-is-cloud-dns) is a high-
 * performance, resilient, global DNS service that provides a cost-effective way

* @type {module:logging/log}
 * @private
 */
var Log = require('./log.js');

/**
 * @type {module:logging/sink}
 * @private
 */
var Sink = require('./sink.js');

/**
 * @type {module:common/stream-router}
 * @private
 */
var streamRouter = common.streamRouter;

/**
 * @type {module:pubsub/topic}
 * @private
 */
var Topic = require('@google-cloud/pubsub').Topic;

/**
 * @type {module:common/util}
 * @private
 */
var util = common.util;

/**
 * [Google Cloud Logging](https://cloud.google.com/logging/docs) collects and
 * stores logs from applications and services on the Google Cloud Platform:

* @type {module:dns/record}
 * @private
 */
var Record = require('./record.js');

/**
 * @type {module:common/service-object}
 * @private
 */
var ServiceObject = common.ServiceObject;

/**
 * @type {module:common/stream-router}
 * @private
 */
var streamRouter = common.streamRouter;

/**
 * A Zone object is used to interact with your project's managed zone. It will
 * help you add or delete records, delete your zone, and many other convenience
 * methods.
 *
 * @constructor
 * @alias module:dns/zone
 *
 * @example
 * var gcloud = require('google-cloud');
 *
 * var dns = gcloud.dns({
 *   keyFilename: '/path/to/keyfile.json',
 *   projectId: 'grape-spaceship-123'
 * });