Minor lint fixes for GAE samples

appengine/analytics/app.js

@@ -24,7 +24,7 @@ app.enable('trust proxy');
 
 // The following environment variable is set by app.yaml when running on App
 // Engine, but will need to be set manually when running locally. See README.md.
-const GA_TRACKING_ID = process.env.GA_TRACKING_ID;
+const {GA_TRACKING_ID} = process.env;
 
 function trackEvent(category, action, label, value) {
   const data = {

appengine/endpoints/app.js

@@ -17,7 +17,7 @@
 
 const express = require('express');
 const bodyParser = require('body-parser');
-const Buffer = require('safe-buffer').Buffer;
+const {Buffer} = require('safe-buffer');
 
 const app = express();
 app.use(bodyParser.json());

appengine/endpoints/test/app.test.js

@@ -15,7 +15,7 @@
 
 'use strict';
 
-const Buffer = require('safe-buffer').Buffer;
+const {Buffer} = require('safe-buffer');
 const express = require('express');
 const path = require('path');
 const proxyquire = require('proxyquire').noCallThru();

appengine/headless-chrome/app.js

@@ -23,7 +23,7 @@ const app = express();
 let browser;
 
 app.use(async (req, res) => {
-  const url = req.query.url;
+  const {url} = req.query;
 
   if (!url) {
     return res.send(
@@ -51,7 +51,7 @@ const server = app.listen(process.env.PORT || 8080, err => {
   if (err) {
     return console.error(err);
   }
-  const port = server.address().port;
+  const {port} = server.address();
   console.info(`App listening on port ${port}`);
 });
 // [END full_sample]

appengine/memcached/app.js

@@ -22,7 +22,7 @@ const app = express();
 
 // [START gae_flex_redislabs_memcache]
 // Environment variables are defined in app.yaml.
-const MEMCACHE_URL = process.env.MEMCACHE_URL;
+const {MEMCACHE_URL} = process.env;
 
 const mc = memjs.Client.create(MEMCACHE_URL);
 // [END gae_flex_redislabs_memcache]

appengine/pubsub/app.js

@@ -19,7 +19,7 @@ const express = require('express');
 const bodyParser = require('body-parser');
 const {OAuth2Client} = require('google-auth-library');
 const path = require('path');
-const Buffer = require('safe-buffer').Buffer;
+const {Buffer} = require('safe-buffer');
 const process = require('process'); // Required for mocking environment variables
 
 // By default, the client will authenticate using the service account file
@@ -47,7 +47,7 @@ const tokens = [];
 
 // The following environment variables are set by app.yaml when running on GAE,
 // but will need to be manually set when running locally.
-const PUBSUB_VERIFICATION_TOKEN = process.env.PUBSUB_VERIFICATION_TOKEN;
+const {PUBSUB_VERIFICATION_TOKEN} = process.env;
 const TOPIC = process.env.PUBSUB_TOPIC;
 
 const topic = pubsub.topic(TOPIC);

appengine/sendgrid/app.js

@@ -23,8 +23,8 @@ const bodyParser = require('body-parser');
 // The following environment variables are set by app.yaml (app.flexible.yaml or
 // app.standard.yaml) when running on Google App Engine,
 // but will need to be manually set when running locally.
-const SENDGRID_API_KEY = process.env.SENDGRID_API_KEY;
-const SENDGRID_SENDER = process.env.SENDGRID_SENDER;
+const {SENDGRID_API_KEY} = process.env;
+const {SENDGRID_SENDER} = process.env;
 const Sendgrid = require('@sendgrid/client');
 
 Sendgrid.setApiKey(SENDGRID_API_KEY);

appengine/storage/flexible/app.js

@@ -18,7 +18,7 @@
 const process = require('process'); // Required to mock environment variables
 
 // [START gae_flex_storage_app]
-const format = require('util').format;
+const {format} = require('util');
 const express = require('express');
 const Multer = require('multer');
 const bodyParser = require('body-parser');

appengine/storage/standard/app.js

@@ -18,7 +18,7 @@
 const process = require('process'); // Required to mock environment variables
 
 // [START gae_storage_app]
-const format = require('util').format;
+const {format} = require('util');
 const express = require('express');
 const Multer = require('multer');
 const bodyParser = require('body-parser');

appengine/twilio/app.js

@@ -22,7 +22,7 @@ const bodyParser = require('body-parser').urlencoded({
 
 const app = express();
 
-const TWILIO_NUMBER = process.env.TWILIO_NUMBER;
+const {TWILIO_NUMBER} = process.env;
 if (!TWILIO_NUMBER) {
   console.log(
     'Please configure environment variables as described in README.md'
@@ -39,7 +39,7 @@ const twilioClient = Twilio(
   process.env.TWILIO_AUTH_TOKEN
 );
 
-const TwimlResponse = Twilio.TwimlResponse;
+const {TwimlResponse} = Twilio;
 
 // [START gae_flex_twilio_receive_call]
 app.post('/call/receive', (req, res) => {
@@ -55,7 +55,7 @@ app.post('/call/receive', (req, res) => {
 
 // [START gae_flex_twilio_send_sms]
 app.get('/sms/send', async (req, res, next) => {
-  const to = req.query.to;
+  const {to} = req.query;
   if (!to) {
     res
       .status(400)