diff --git a/bin/node-lambda b/bin/node-lambda
index 3697b5ea..1fba87a8 100755
--- a/bin/node-lambda
+++ b/bin/node-lambda
@@ -34,48 +34,48 @@ if (commandTypes.indexOf(process.argv[2]) === -1) {
   process.exit(1)
 }
 
-var path = require('path')
-var dotenv = require('dotenv')
-var lambda = require(path.join(__dirname, '..', 'lib', 'main.js'))
-var program = require('commander')
-var fs = require('fs')
-var packageJson = fs.existsSync(path.join(process.cwd(), 'package.json'))
+const path = require('path')
+const dotenv = require('dotenv')
+const lambda = require(path.join(__dirname, '..', 'lib', 'main.js'))
+const program = require('commander')
+const fs = require('fs')
+const packageJson = fs.existsSync(path.join(process.cwd(), 'package.json'))
   ? require(path.join(process.cwd(), 'package.json')) : {}
-var packageJsonName = packageJson.name || 'UnnamedFunction'
+const packageJsonName = packageJson.name || 'UnnamedFunction'
 
 dotenv.load()
 
-var AWS_ENVIRONMENT = process.env.AWS_ENVIRONMENT || ''
-var CONFIG_FILE = process.env.CONFIG_FILE || ''
-var EVENT_SOURCE_FILE = process.env.EVENT_SOURCE_FILE || ''
-var EXCLUDE_GLOBS = process.env.EXCLUDE_GLOBS || ''
-var AWS_ACCESS_KEY_ID = process.env.AWS_ACCESS_KEY_ID
-var AWS_SECRET_ACCESS_KEY = process.env.AWS_SECRET_ACCESS_KEY
-var AWS_PROFILE = process.env.AWS_PROFILE || ''
-var AWS_SESSION_TOKEN = process.env.AWS_SESSION_TOKEN || ''
-var AWS_REGION = process.env.AWS_REGION || 'us-east-1,us-west-2,eu-west-1'
-var AWS_FUNCTION_NAME = process.env.AWS_FUNCTION_NAME || packageJsonName
-var AWS_HANDLER = process.env.AWS_HANDLER || 'index.handler'
-var AWS_ROLE = process.env.AWS_ROLE_ARN || process.env.AWS_ROLE || 'missing'
-var AWS_MEMORY_SIZE = process.env.AWS_MEMORY_SIZE || 128
-var AWS_TIMEOUT = process.env.AWS_TIMEOUT || 60
-var AWS_RUN_TIMEOUT = process.env.AWS_RUN_TIMEOUT || 3
-var AWS_DESCRIPTION = process.env.AWS_DESCRIPTION || packageJson.description || ''
-var AWS_RUNTIME = process.env.AWS_RUNTIME || 'nodejs6.10'
-var AWS_PUBLISH = process.env.AWS_PUBLISH || false
-var AWS_FUNCTION_VERSION = process.env.AWS_FUNCTION_VERSION || ''
-var AWS_VPC_SUBNETS = process.env.AWS_VPC_SUBNETS || ''
-var AWS_VPC_SECURITY_GROUPS = process.env.AWS_VPC_SECURITY_GROUPS || ''
-var AWS_TRACING_CONFIG = process.env.AWS_TRACING_CONFIG || ''
-var EVENT_FILE = process.env.EVENT_FILE || 'event.json'
-var PACKAGE_DIRECTORY = process.env.PACKAGE_DIRECTORY
-var CONTEXT_FILE = process.env.CONTEXT_FILE || 'context.json'
-var PREBUILT_DIRECTORY = process.env.PREBUILT_DIRECTORY || ''
-var SRC_DIRECTORY = process.env.SRC_DIRECTORY || ''
-var DEPLOY_TIMEOUT = process.env.DEPLOY_TIMEOUT || 120000
-var DOCKER_IMAGE = process.env.DOCKER_IMAGE || ''
-var DEPLOY_ZIPFILE = process.env.DEPLOY_ZIPFILE || ''
-var AWS_DLQ_TARGET_ARN = (function () {
+const AWS_ENVIRONMENT = process.env.AWS_ENVIRONMENT || ''
+const CONFIG_FILE = process.env.CONFIG_FILE || ''
+const EVENT_SOURCE_FILE = process.env.EVENT_SOURCE_FILE || ''
+const EXCLUDE_GLOBS = process.env.EXCLUDE_GLOBS || ''
+const AWS_ACCESS_KEY_ID = process.env.AWS_ACCESS_KEY_ID
+const AWS_SECRET_ACCESS_KEY = process.env.AWS_SECRET_ACCESS_KEY
+const AWS_PROFILE = process.env.AWS_PROFILE || ''
+const AWS_SESSION_TOKEN = process.env.AWS_SESSION_TOKEN || ''
+const AWS_REGION = process.env.AWS_REGION || 'us-east-1,us-west-2,eu-west-1'
+const AWS_FUNCTION_NAME = process.env.AWS_FUNCTION_NAME || packageJsonName
+const AWS_HANDLER = process.env.AWS_HANDLER || 'index.handler'
+const AWS_ROLE = process.env.AWS_ROLE_ARN || process.env.AWS_ROLE || 'missing'
+const AWS_MEMORY_SIZE = process.env.AWS_MEMORY_SIZE || 128
+const AWS_TIMEOUT = process.env.AWS_TIMEOUT || 60
+const AWS_RUN_TIMEOUT = process.env.AWS_RUN_TIMEOUT || 3
+const AWS_DESCRIPTION = process.env.AWS_DESCRIPTION || packageJson.description || ''
+const AWS_RUNTIME = process.env.AWS_RUNTIME || 'nodejs6.10'
+const AWS_PUBLISH = process.env.AWS_PUBLISH || false
+const AWS_FUNCTION_VERSION = process.env.AWS_FUNCTION_VERSION || ''
+const AWS_VPC_SUBNETS = process.env.AWS_VPC_SUBNETS || ''
+const AWS_VPC_SECURITY_GROUPS = process.env.AWS_VPC_SECURITY_GROUPS || ''
+const AWS_TRACING_CONFIG = process.env.AWS_TRACING_CONFIG || ''
+const EVENT_FILE = process.env.EVENT_FILE || 'event.json'
+const PACKAGE_DIRECTORY = process.env.PACKAGE_DIRECTORY
+const CONTEXT_FILE = process.env.CONTEXT_FILE || 'context.json'
+const PREBUILT_DIRECTORY = process.env.PREBUILT_DIRECTORY || ''
+const SRC_DIRECTORY = process.env.SRC_DIRECTORY || ''
+const DEPLOY_TIMEOUT = process.env.DEPLOY_TIMEOUT || 120000
+const DOCKER_IMAGE = process.env.DOCKER_IMAGE || ''
+const DEPLOY_ZIPFILE = process.env.DEPLOY_ZIPFILE || ''
+const AWS_DLQ_TARGET_ARN = (function () {
   // You can clear the setting by passing an empty string
   // when executing updateFunctionConfiguration
   if (process.env.AWS_DLQ_TARGET_ARN !== undefined) {
diff --git a/lib/main.js b/lib/main.js
index 808b7ea5..18b41a04 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -1,21 +1,21 @@
 'use strict'
 
-var path = require('path')
-var aws = require('aws-sdk')
-var exec = require('child_process').exec
-var execSync = require('child_process').execSync
-var execFile = require('child_process').execFile
-var fs = require('fs-extra')
-var packageJson = require(path.join(__dirname, '..', 'package.json'))
-var minimatch = require('minimatch')
-var async = require('async')
-var zip = new (require('node-zip'))()
-var dotenv = require('dotenv')
-var ScheduleEvents = require(path.join(__dirname, 'schedule_events'))
-
-var maxBufferSize = 50 * 1024 * 1024
-
-var Lambda = function () {
+const path = require('path')
+const aws = require('aws-sdk')
+const exec = require('child_process').exec
+const execSync = require('child_process').execSync
+const execFile = require('child_process').execFile
+const fs = require('fs-extra')
+const packageJson = require(path.join(__dirname, '..', 'package.json'))
+const minimatch = require('minimatch')
+const async = require('async')
+const zip = new (require('node-zip'))()
+const dotenv = require('dotenv')
+const ScheduleEvents = require(path.join(__dirname, 'schedule_events'))
+
+const maxBufferSize = 50 * 1024 * 1024
+
+const Lambda = function () {
   this.version = packageJson.version
 
   return this