70 changed files with 1849 additions and 2730 deletions
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@ -0,0 +1,37 @@
 <!--
 Questions:
  https://groups.google.com/forum/#!forum/loopbackjs
  https://gitter.im/strongloop/loopback
 Immediate support:
  https://strongloop.com/api-connect-faqs/
  https://strongloop.com/node-js/subscription-plans/
 -->
 # Description/Steps to reproduce
 <!--
 If feature: A description of the feature
 If bug: Steps to reproduce
 -->
 # Link to reproduction sandbox
 <!--
 Link to an app sandbox for reproduction
 Note: Failure to provide a sandbox application for reproduction purposes will result in the issue being closed.
 -->
 # Expected result
 <!--
 Also include actual results if bug
 -->
 # Additional information
 <!--
 Copy+paste the output of these two commands:
  node -e 'console.log(process.platform, process.arch, process.versions.node)'
  npm ls --prod --depth 0 | grep loopback
 -->
--- a/.github/ISSUE_TEMPLATE/Bug_report.md
+++ b/.github/ISSUE_TEMPLATE/Bug_report.md
@ -1,50 +0,0 @@
 ---
 name: Bug report
 about: Create a report to help us improve
 labels: bug
 ---
 <!-- 🚨 STOP 🚨 STOP 🚨 STOP 🚨
 HELP US HELP YOU, PLEASE
 - Do a quick search to avoid duplicate issues
 - Provide as much information as possible (reproduction sandbox, use case for features, etc.)
 - Consider using a more suitable venue for questions such as Stack Overflow, Gitter, etc.
 Please fill in the *entire* template below.
 -->
 ## Steps to reproduce
 <!-- Describe how to reproduce the issue -->
 ## Current Behavior
 <!-- Describe the observed result -->
 ## Expected Behavior
 <!-- Describe what did you expect instead, what is the desired outcome? -->
 ## Link to reproduction sandbox
 <!--
 See https://loopback.io/doc/en/contrib/Reporting-issues.html#loopback-3x-bugs
 Note: Failure to provide a sandbox application for reproduction purposes will result in the issue being closed.
 -->
 ## Additional information
 <!--
 Copy+paste the output of these two commands:
  node -e 'console.log(process.platform, process.arch, process.versions.node)'
  npm ls --prod --depth 0 | grep loopback
 -->
 ## Related Issues
 <!-- Did you find other bugs that looked similar? -->
 _See [Reporting Issues](http://loopback.io/doc/en/contrib/Reporting-issues.html) for more tips on writing good issues_
--- a/.github/ISSUE_TEMPLATE/Feature_request.md
+++ b/.github/ISSUE_TEMPLATE/Feature_request.md
@ -1,25 +0,0 @@
 ---
 name: Feature request
 about: Suggest an idea for this project
 labels: feature
 ---
 ## Suggestion
 <!-- A summary of what you'd like to see added or changed -->
 ## Use Cases
 <!--
 What do you want to use this for?
 What shortcomings exist with current approaches?
 -->
 ## Examples
 <!-- Show how this would be used and what the behavior would be -->
 ## Acceptance criteria
 TBD - will be filled by the team.
--- a/.github/ISSUE_TEMPLATE/Question.md
+++ b/.github/ISSUE_TEMPLATE/Question.md
@ -1,27 +0,0 @@
 ---
 name: Question
 about: The issue tracker is not for questions. Please use Stack Overflow or other resources for help.
 labels: question
 ---
 <!-- 🚨 STOP 🚨 STOP 🚨 STOP 🚨
 THE ISSUE TRACKER IS NOT FOR QUESTIONS.
 DO NOT CREATE A NEW ISSUE TO ASK A QUESTION.
 Please use one of the following resources for help:
 **Questions**
 - https://stackoverflow.com/tags/loopbackjs
 - https://groups.google.com/forum/#!forum/loopbackjs
 - https://gitter.im/strongloop/loopback
 **Immediate support**
 - https://strongloop.com/api-connect-faqs/
 - https://strongloop.com/node-js/subscription-plans/
 -->
--- a/.github/ISSUE_TEMPLATE/config.yml
+++ b/.github/ISSUE_TEMPLATE/config.yml
@ -1,11 +0,0 @@
 blank_issues_enabled: false
 contact_links:
  - name: Report a security vulnerability
    url: https://loopback.io/doc/en/contrib/Reporting-issues.html#security-issues
    about: Do not report security vulnerabilities using GitHub issues. Please send an email to `reachsl@us.ibm.com` instead.
  - name: Get help on StackOverflow
    url: https://stackoverflow.com/tags/loopbackjs
    about: Please ask and answer questions on StackOverflow.
  - name: Join our mailing list
    url: https://groups.google.com/forum/#!forum/loopbackjs
    about: You can also post your question to our mailing list.
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@ -1,18 +1,25 @@
 ### Description
 #### Related issues
 <!--
-Please provide a high-level description of the changes made by your pull request.
+Please use the following link syntaxes:
-Include references to all related GitHub issues and other pull requests, for example:
+- connect to #49 (to reference issues in the current repository)
-
+- connect to strongloop/loopback#49 (to reference issues in another repository)
 Fixes #123
 Implements #254
 See also #23
 -->
-## Checklist
+- connect to <link_to_referenced_issue>
-👉 [Read and sign the CLA (Contributor License Agreement)](https://cla.strongloop.com/agreements/strongloop/loopback-boot) 👈
+### Checklist
 <!--
 - Please mark your choice with an "x" (i.e. [x], see
 https://github.com/blog/1375-task-lists-in-gfm-issues-pulls-comments)
 - PR's without test coverage will be closed.
 -->
 - [ ] `npm test` passes on your machine
 - [ ] New tests added or existing tests modified to cover all changes
- [ ] Code conforms with the [style guide](https://loopback.io/doc/en/contrib/style-guide-es6.html)
+- [ ] Code conforms with the [style
- [ ] Commit messages are following our [guidelines](https://loopback.io/doc/en/contrib/git-commit-messages.html)
+  guide](http://loopback.io/doc/en/contrib/style-guide.html)
--- a/.github/stale.yml
+++ b/.github/stale.yml
@ -1,24 +0,0 @@
 # Number of days of inactivity before an issue becomes stale
 daysUntilStale: 60
 # Number of days of inactivity before a stale issue is closed
 daysUntilClose: 14
 # Issues with these labels will never be considered stale
 exemptLabels:
  - pinned
  - security
  - critical
  - p1
  - major
 # Label to use when marking an issue as stale
 staleLabel: stale
 # Comment to post when marking an issue as stale. Set to `false` to disable
 markComment: >
  This issue has been automatically marked as stale because it has not had
  recent activity. It will be closed if no further activity occurs. Thank you
  for your contributions.
 # Comment to post when closing a stale issue. Set to `false` to disable
 closeComment: >
  This issue has been closed due to continued inactivity. Thank you for your understanding.
  If you believe this to be in error, please contact one of the code owners,
  listed in the `CODEOWNERS` file at the top-level of this repository.
--- a/.npmrc
+++ b/.npmrc
@ -1 +0,0 @@
 package-lock=false
--- a/.travis.yml
+++ b/.travis.yml
@ -1,6 +1,7 @@
 sudo: false
 language: node_js
 node_js:
-  - "8"
+  - "4"
-  - "10"
+  - "6"
  - "7"
--- a/CHANGES.md
+++ b/CHANGES.md
@ -1,49 +1,3 @@
 2019-06-24, Version 3.3.1
 =========================
 * chore: update LTS status (Diana Lau)
 * chore: update copyrights years (Agnes Lin)
 2019-03-28, Version 3.3.0
 =========================
 * chore: upgrade deps to avoid npm audit warnings (Raymond Feng)
 2019-03-22, Version 3.2.1
 =========================
 * fix: set `app.booting` flag immediately (Miroslav Bajtoš)
 * fix: update lodash (jannyHou)
 2018-10-18, Version 3.2.0
 =========================
 * README: update LTS status (Miroslav Bajtoš)
 * Add support for es6 modules for boot scripts (Walker)
 2018-07-26, Version 3.1.1
 =========================
 * update: dependency (jannyHou)
 * chore: update dependencies (Diana Lau)
 * [WebFM] cs/pl/ru translation (candytangnb)
 * chore: update license (Diana Lau)
 * CODEOWNERS: move @lehni to Alumni section (Miroslav Bajtoš)
 * Add support for ES6 style async boot scripts (Jürg Lehni)
 2017-10-13, Version 3.1.0
 =========================
--- a/8
+++ b/8
@ -2,10 +2,4 @@
 # Each line is a file pattern followed by one or more owners,
 # the last matching pattern has the most precendence.
-# Current maintainers
+* @raymondfeng @lehni @zbarbuto
 * @raymondfeng @zbarbuto
 # Alumni
 #
 # @lehni
--- a/2
+++ b/2
@ -1,4 +1,4 @@
-Copyright (c) IBM Corp. 2014,2017. All Rights Reserved.
+Copyright (c) IBM Corp. 2014,2016. All Rights Reserved.
 Node module: loopback-boot
 This project is licensed under the MIT License, full text below.
--- a/README.md
+++ b/README.md
@ -1,21 +1,11 @@
 # LoopBack Boot
 **⚠️ LoopBack 3 has reached end of life. We are no longer accepting pull requests or providing 
 support for community users. The only exception is fixes for critical bugs and security 
 vulnerabilities provided as part of support for IBM API Connect customers. (See
 [Module Long Term Support Policy](#module-long-term-support-policy) below.)**
 We urge all LoopBack 3 users to migrate their applications to LoopBack 4 as
 soon as possible. Refer to our
 [Migration Guide](https://loopback.io/doc/en/lb4/migration-overview.html)
 for more information on how to upgrade.
 ## Overview
 A convention-based bootstrapper for LoopBack applications.
 For full documentation, see the official StrongLoop documentation: [Defining boot scripts](https://loopback.io/doc/en/lb2/Defining-boot-scripts) and [Creating a LoopBack application](https://loopback.io/doc/en/lb2/Creating-an-application).
 ## Overview
 The loopback-boot module initializes (bootstraps) a LoopBack application.  Specifically, it:
 - Configures data-sources.
 - Defines custom models
@ -56,19 +46,6 @@ app.listen();
 See [API docs](http://apidocs.strongloop.com/loopback-boot/) for
 complete API reference.
 ## Module Long Term Support Policy
 This module adopts the [
 Module Long Term Support (LTS)](http://github.com/CloudNativeJS/ModuleLTS) policy,
 with the following End Of Life (EOL) dates:
 | Version | Status          | Published | EOL      |
 | ------- | --------------- | --------- | -------- |
 | 3.x     | End-of-Life     | May 2017  | Dec 2020 |
 | 2.x     | End-of-Life     | Jul 2014  | Apr 2019 |
 Learn more about our LTS plan in [docs](https://loopback.io/doc/en/contrib/Long-term-support.html).
 ## License
 This module is provided under dual MIT/StrongLoop license.  See [LICENSE](LICENSE) for details.
--- a/browser.js
+++ b/browser.js
@ -1,11 +1,11 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const Bootstrapper = require('./lib/bootstrapper');
+var Bootstrapper = require('./lib/bootstrapper');
 /**
 * The browser version of `bootLoopBackApp`.
@ -26,18 +26,18 @@ const Bootstrapper = require('./lib/bootstrapper');
 exports = module.exports = function bootBrowserApp(app, options, callback) {
  // Only using options.id to identify the browserified bundle to load for
  // this application. If no Id was provided, load the default bundle.
-  let moduleName = 'loopback-boot#instructions';
+  var moduleName = 'loopback-boot#instructions';
-  const appId = options && typeof options === 'object' && options.appId;
+  var appId = options && typeof options === 'object' && options.appId;
  if (appId)
    moduleName += '-' + appId;
  // The name of the module containing instructions
  // is hard-coded in lib/bundler
-  const instructions = require(moduleName);
+  var instructions = require(moduleName);
-  const bootstrapper = new Bootstrapper(options);
+  var bootstrapper = new Bootstrapper(options);
  bootstrapper.phases = ['starting', 'start', 'started'];
-  const context = {
+  var context = {
    app: app,
    instructions: instructions,
  };
--- a/index.js
+++ b/index.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
@ -6,11 +6,11 @@
 'use strict';
 // Strong globalize
-const g = require('./lib/globalize');
+var g = require('./lib/globalize');
-const PluginBase = require('./lib/plugin-base');
+var PluginBase = require('./lib/plugin-base');
-const Bootstrapper = require('./lib/bootstrapper');
+var Bootstrapper = require('./lib/bootstrapper');
-const addInstructionsToBrowserify = require('./lib/bundler');
+var addInstructionsToBrowserify = require('./lib/bundler');
 /**
 * Initialize an application from an options object or
@ -158,9 +158,9 @@ exports = module.exports = function bootLoopBackApp(app, options, callback) {
  // backwards compatibility with loopback's app.boot
  options.env = options.env || app.get('env');
-  const bootstrapper = new Bootstrapper(options);
+  var bootstrapper = new Bootstrapper(options);
-  const context = {
+  var context = {
    bootstrapper: bootstrapper,
    app: app,
  };
@ -169,9 +169,9 @@ exports = module.exports = function bootLoopBackApp(app, options, callback) {
 };
 exports.compile = function(options, done) {
-  const bootstrapper = new Bootstrapper(options);
+  var bootstrapper = new Bootstrapper(options);
  bootstrapper.phases = ['load', 'compile'];
-  const context = {};
+  var context = {};
  return bootstrapper.run(context, done);
 };
@ -199,10 +199,9 @@ exports.Bootstrapper = Bootstrapper;
 exports.PluginBase = PluginBase;
 exports.execute = function(app, instructions, done) {
-  const bootstrapper = new Bootstrapper(
+  var bootstrapper = new Bootstrapper(
-    {phases: ['starting', 'start', 'started']},
+    {phases: ['starting', 'start', 'started']});
-  );
+  var context = {
  const context = {
    app: app,
    instructions: instructions,
  };
--- a/intl/cs/messages.json
+++ b/intl/cs/messages.json
@ -1,17 +0,0 @@
 {
  "1e5fea50eef843cbffd1d438494912c8": "Nelze vyřešit cestu \"{0}\"",
  "34319676975b1abf107da7a056abb434": "Neplatný formát normalizace - \"{0}\"",
  "3a7049e42006e8bc19e0f4fc8df63b6b": "Aplikace `app` je založena na nekompatibilní verzí Loopback {0}. Podporované verze: {1}",
  "3f93b626dd9a1c33d67490f6e71018b5": "VAROVÁNÍ: Hlavní konfigurační soubor \"{0}{{.json}}\" chybí",
  "4d052d84c8620730afd4a30832f11724": "Nelze konfigurovat neznámý model {0}",
  "4ed668e9187650d898acf97707df445a": "Fáze {{phase}} \"{0}\" není definována v hlavní konfiguraci.",
  "6447e6b342a2c51ab0bc53b3cbdf3742": "Konflikt řazení: Nelze přidat \"{0}\" za \"{1}\", protože již bylo uvedené opačné pořadí",
  "70654dc6eb565613a33344efed3de998": "Nezdařilo se načíst zaváděcí skript: {0}\n{1}",
  "7f7bdcadb75abfef1bd8a126d547dd6d": "{0} se neinterpretuje na platnou hodnotu, vráceno jako {1}. \"{2}\" musí být rozdělitelný v proměnné prostředí nebo {{app.get()}}.",
  "91a742b7c3568cf6b6755741a70b3c52": "{{middleware}} \"{0}\" v {{phase}} \"{1}\" není definováno v hlavní konfiguraci.",
  "a3aa22086ae4976cd013065c9a3ff81c": "Nelze použít {0}: ",
  "be2cf2868ba54624fe38e9908dde5e9e": "Data v {{model-config.json}} jsou v nepodporovaném formátu {{1.x}}.",
  "ec551b6f2fafd8d40af801ebe5bb09f6": "Vyřazení pokynů {{middleware}}, klient {{loopback}} nepodporuje {{middleware}}.",
  "fdc23df1bd0fe55fe3faabcc89ff60f3": "Middleware \"{0}\" nelze nalézt: {1}"
 }
--- a/intl/pl/messages.json
+++ b/intl/pl/messages.json
@ -1,17 +0,0 @@
 {
  "1e5fea50eef843cbffd1d438494912c8": "Nie można rozstrzygnąć ścieżki \"{0}\"",
  "34319676975b1abf107da7a056abb434": "Niepoprawny format normalizacji — \"{0}\"",
  "3a7049e42006e8bc19e0f4fc8df63b6b": "Aplikacja jest obsługiwana przez niezgodną wersję aplikacji LoopBack {0}. Obsługiwane wersje: {1}",
  "3f93b626dd9a1c33d67490f6e71018b5": "OSTRZEŻENIE: Brak głównego pliku konfiguracyjnego \"{0}{{.json}}\"",
  "4d052d84c8620730afd4a30832f11724": "Nie można skonfigurować nieznanego modelu {0}",
  "4ed668e9187650d898acf97707df445a": "Faza {{phase}} \"{0}\" nie została zdefiniowana w konfiguracji głównej.",
  "6447e6b342a2c51ab0bc53b3cbdf3742": "Konflikt porządkowania: nie można dodać elementu \"{0}\" po elemencie \"{1}\", ponieważ została już określona odwrotna kolejność",
  "70654dc6eb565613a33344efed3de998": "Nie powiodło się ładowanie skryptu startowego: {0}\n{1}",
  "7f7bdcadb75abfef1bd8a126d547dd6d": "{0} nie umożliwia rozstrzygnięcia na poprawną wartość, zwrócono jako {1}. \"{2}\" musi umożliwiać rozstrzygnięcie w zmiennej środowiskowej lub przez metodę {{app.get()}}.",
  "91a742b7c3568cf6b6755741a70b3c52": "Warstwa pośrednia {{middleware}} \"{0}\" w fazie {{phase}} \"{1}\" nie została zdefiniowana w konfiguracji głównej.",
  "a3aa22086ae4976cd013065c9a3ff81c": "Nie można zastosować {0}: ",
  "be2cf2868ba54624fe38e9908dde5e9e": "Dane w pliku {{model-config.json}} mają nieobsługiwany format {{1.x}}.",
  "ec551b6f2fafd8d40af801ebe5bb09f6": "Odrzucanie instrukcji warstwy pośredniej {{middleware}}, klient {{loopback}} nie obsługuje warstwy pośredniej {{middleware}}.",
  "fdc23df1bd0fe55fe3faabcc89ff60f3": "Warstwa pośrednia \"{0}\" nie została znaleziona: {1}"
 }
--- a/intl/ru/messages.json
+++ b/intl/ru/messages.json
@ -1,17 +0,0 @@
 {
  "1e5fea50eef843cbffd1d438494912c8": "Не удалось определить путь \"{0}\"",
  "34319676975b1abf107da7a056abb434": "Недопустимый формат нормализации - \"{0}\"",
  "3a7049e42006e8bc19e0f4fc8df63b6b": "Приложение `app` создано на основе несовместимой версии loopback {0}. Поддерживаемые версии: {1}",
  "3f93b626dd9a1c33d67490f6e71018b5": "ПРЕДУПРЕЖДЕНИЕ: отсутствует главный файл конфигурации \"{0}{{.json}}\"",
  "4d052d84c8620730afd4a30832f11724": "Не удается настроить неизвестную модель {0}",
  "4ed668e9187650d898acf97707df445a": "Этап {{phase}} \"{0}\" не определен в главной конфигурации.",
  "6447e6b342a2c51ab0bc53b3cbdf3742": "Конфликт упорядочения: не удается добавить \"{0}\" после \"{1}\", та как уже указан другой порядок",
  "70654dc6eb565613a33344efed3de998": "Не удалось загрузить сценарий загрузки: {0}\n{1}",
  "7f7bdcadb75abfef1bd8a126d547dd6d": "{0} не удается определить в допустимое значение, возвращено как {1}. \"{2}\" должен определяться как переменная среды или с помощью {{app.get()}}.",
  "91a742b7c3568cf6b6755741a70b3c52": "{{middleware}} \"{0}\" на этапе {{phase}} \"{1}\"не определено в главной конфигурации.",
  "a3aa22086ae4976cd013065c9a3ff81c": "Не удается применить {0}: ",
  "be2cf2868ba54624fe38e9908dde5e9e": "Данные в {{model-config.json}} указаны в неподдерживаемом формате {{1.x}}.",
  "ec551b6f2fafd8d40af801ebe5bb09f6": "Инструкции {{middleware}} отменяются, клиент {{loopback}} не поддерживает {{middleware}}.",
  "fdc23df1bd0fe55fe3faabcc89ff60f3": "Не найдено промежуточное ПО \"{0}\": {1}"
 }
--- a/lib/bootstrapper.js
+++ b/lib/bootstrapper.js
@ -1,25 +1,25 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const _ = require('lodash');
+var _ = require('lodash');
-const assert = require('assert');
+var assert = require('assert');
-const async = require('async');
+var async = require('async');
-const utils = require('./utils');
+var utils = require('./utils');
-const path = require('path');
+var path = require('path');
-const pluginLoader = require('./plugin-loader');
+var pluginLoader = require('./plugin-loader');
-const debug = require('debug')('loopback:boot:bootstrapper');
+var debug = require('debug')('loopback:boot:bootstrapper');
-const Promise = require('bluebird');
+var Promise = require('bluebird');
-const arrayToObject = require('./utils').arrayToObject;
+var arrayToObject = require('./utils').arrayToObject;
 module.exports = Bootstrapper;
 function createPromiseCallback() {
-  let cb;
+  var cb;
-  const promise = new Promise(function(resolve, reject) {
+  var promise = new Promise(function(resolve, reject) {
    cb = function(err, data) {
      if (err) return reject(err);
      return resolve(data);
@ -29,22 +29,22 @@ function createPromiseCallback() {
  return cb;
 }
-const builtinPlugins = [
+var builtinPlugins = [
  'application', 'datasource', 'model', 'mixin',
  'middleware', 'component', 'boot-script', 'swagger',
 ];
-const builtinPhases = [
+var builtinPhases = [
  'load', 'compile', 'starting', 'start', 'started',
 ];
 function loadAndRegisterPlugins(bootstrapper, options) {
-  const loader = pluginLoader(options);
+  var loader = pluginLoader(options);
-  const loaderContext = {};
+  var loaderContext = {};
  loader.load(loaderContext);
  loader.compile(loaderContext);
-  for (const i in loaderContext.instructions.pluginScripts) {
+  for (var i in loaderContext.instructions.pluginScripts) {
    bootstrapper.use('/boot/' + i, loaderContext.instructions.pluginScripts[i]);
  }
 }
@ -65,13 +65,13 @@ function Bootstrapper(options) {
  // For setting properties without modifying the original object
  options = Object.create(options);
-  const appRootDir = options.appRootDir = options.appRootDir || process.cwd();
+  var appRootDir = options.appRootDir = options.appRootDir || process.cwd();
-  const env = options.env || process.env.NODE_ENV || 'development';
+  var env = options.env || process.env.NODE_ENV || 'development';
-  const scriptExtensions = options.scriptExtensions ?
+  var scriptExtensions = options.scriptExtensions ?
    arrayToObject(options.scriptExtensions) :
    require.extensions;
-  const appConfigRootDir = options.appConfigRootDir || appRootDir;
+  var appConfigRootDir = options.appConfigRootDir || appRootDir;
  options.rootDir = appConfigRootDir;
  options.env = env;
@ -84,9 +84,9 @@ function Bootstrapper(options) {
  assert(Array.isArray(this.plugins), 'Invalid plugins: ' +
    this.builtinPlugins);
-  const self = this;
+  var self = this;
  self.builtinPlugins.forEach(function(p) {
-    const factory = require('./plugins/' + p);
+    var factory = require('./plugins/' + p);
    self.use('/boot/' + p, factory(options));
  });
@ -103,7 +103,7 @@ function Bootstrapper(options) {
 * @param {Function} handler
 */
 Bootstrapper.prototype.use = function(path, handler) {
-  const plugin = {
+  var plugin = {
    path: path,
    handler: handler,
  };
@ -135,7 +135,7 @@ Bootstrapper.prototype.getExtensions = function(path) {
  }
  return this.plugins.filter(function(p) {
    if (p.path.indexOf(path) === -1) return false;
-    const name = p.path.substring(path.length);
+    var name = p.path.substring(path.length);
    return name && name.indexOf('/') === -1;
  });
 };
@ -153,7 +153,7 @@ Bootstrapper.prototype.addPhases = function(phases) {
 function pluginIteratorFactory(context, phase) {
  return function executePluginPhase(plugin, done) {
-    let result;
+    var result;
    if (typeof plugin.handler[phase] !== 'function') {
      debug('Skipping %s.%s', plugin.handler.name, phase);
      return done();
@ -190,32 +190,23 @@ Bootstrapper.prototype.run = function(context, done) {
  if (!done) {
    done = createPromiseCallback();
  }
-  const options = this.options;
+  var options = this.options;
-  const appRootDir = options.appRootDir = options.appRootDir || process.cwd();
+  var appRootDir = options.appRootDir = options.appRootDir || process.cwd();
-  const env = options.env || process.env.NODE_ENV || 'development';
+  var env = options.env || process.env.NODE_ENV || 'development';
-  const appConfigRootDir = options.appConfigRootDir || appRootDir;
+  var appConfigRootDir = options.appConfigRootDir || appRootDir;
  options.rootDir = appConfigRootDir;
  options.env = env;
  context = context || {};
-  const phases = context.phases || this.phases;
+  var phases = context.phases || this.phases;
-
+  var bootPlugins = this.getExtensions('/boot');
  if (phases.includes('starting') || phases.includes('start')) {
    context.app.booting = true;
  }
  const bootPlugins = this.getExtensions('/boot');
  async.eachSeries(phases, function(phase, done) {
    debug('Phase %s', phase);
    async.eachSeries(bootPlugins, pluginIteratorFactory(context, phase), done);
  }, function(err) {
    if (phases.includes('started')) {
      context.app.booting = false;
    }
    return done(err, context);
  });
  return done.promise;
--- a/lib/bundler.js
+++ b/lib/bundler.js
@ -1,15 +1,15 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const fs = require('fs');
+var fs = require('fs');
-const path = require('path');
+var path = require('path');
-const commondir = require('commondir');
+var commondir = require('commondir');
-const cloneDeep = require('lodash').cloneDeep;
+var cloneDeep = require('lodash').cloneDeep;
-const g = require('./globalize');
+var g = require('./globalize');
 /**
 * Add boot instructions to a browserify bundler.
@ -27,8 +27,8 @@ module.exports = function addInstructionsToBrowserify(context, bundler) {
 };
 function addPlugins(bundler) {
-  const dir = path.join(__dirname, './plugins');
+  var dir = path.join(__dirname, './plugins');
-  const files = fs.readdirSync(dir);
+  var files = fs.readdirSync(dir);
  files.forEach(function(f) {
    bundler.require(path.join(dir, f),
      {expose: './plugins/' + path.basename(f, '.js')});
@ -36,12 +36,12 @@ function addPlugins(bundler) {
 }
 function bundleOtherScripts(context, bundler) {
-  const list = context.instructions.bootScripts;
+  var list = context.instructions.bootScripts;
  addScriptsToBundle('boot', list, bundler);
 }
 function bundlePluginScripts(context, bundler) {
-  const list = context.instructions.pluginScripts;
+  var list = context.instructions.pluginScripts;
  addScriptsToBundle('plugins', list, bundler);
 }
@ -58,11 +58,11 @@ function bundleComponentScripts(context, bundler) {
 }
 function bundleSourceFiles(context, type, bundler) {
-  const files = context.instructions[type]
+  var files = context.instructions[type]
    .map(function(m) { return m.sourceFile; })
    .filter(function(f) { return !!f; });
-  const instructionToFileMapping = context.instructions[type]
+  var instructionToFileMapping = context.instructions[type]
    .map(function(m) { return files.indexOf(m.sourceFile); });
  addScriptsToBundle(type, files, bundler);
@ -77,16 +77,15 @@ function bundleSourceFiles(context, type, bundler) {
 function addScriptsToBundle(name, list, bundler) {
  if (!list.length) return;
-  const root = commondir(list.map(path.dirname));
+  var root = commondir(list.map(path.dirname));
-  for (const ix in list) {
+  for (var ix in list) {
-    const filepath = list[ix];
+    var filepath = list[ix];
    // Build a short unique id that does not expose too much
    // information about the file system, but still preserves
    // useful information about where is the file coming from.
-    const fileid =
+    var fileid = 'loopback-boot#' + name + '#' + path.relative(root, filepath);
      'loopback-boot#' + name + '#' + path.relative(root, filepath);
    // Add the file to the bundle.
    bundler.require(filepath, {expose: fileid});
@ -98,19 +97,18 @@ function addScriptsToBundle(name, list, bundler) {
 }
 function bundleInstructions(context, bundler) {
-  const instructions = cloneDeep(context.instructions);
+  var instructions = cloneDeep(context.instructions);
-  const hasMiddleware = instructions.middleware.phases.length ||
+  var hasMiddleware = instructions.middleware.phases.length ||
    instructions.middleware.middleware.length;
  if (hasMiddleware) {
    g.warn(
      'Discarding {{middleware}} instructions,' +
-      ' {{loopback}} client does not support {{middleware}}.',
+      ' {{loopback}} client does not support {{middleware}}.');
    );
  }
  delete instructions.middleware;
-  const instructionsString = JSON.stringify(instructions, null, 2);
+  var instructionsString = JSON.stringify(instructions, null, 2);
  /* The following code does not work due to a bug in browserify
   * https://github.com/substack/node-browserify/issues/771
@ -120,7 +118,7 @@ function bundleInstructions(context, bundler) {
   b.require(instructionsStream, { expose: 'loopback-boot#instructions' });
   */
-  let instructionId = 'instructions';
+  var instructionId = 'instructions';
  // Create an unique instruction identifier using the application ID.
  // This is only useful when multiple loopback applications are being bundled
  // together.
@ -129,10 +127,10 @@ function bundleInstructions(context, bundler) {
  // Write the instructions to a file in our node_modules folder.
  // The location should not really matter as long as it is .gitignore-ed
-  const instructionsFile = path.resolve(__dirname,
+  var instructionsFile = path.resolve(__dirname,
    '..', 'generated-' + instructionId + '.json');
  fs.writeFileSync(instructionsFile, instructionsString, 'utf-8');
-  const moduleName = 'loopback-boot#' + instructionId;
+  var moduleName = 'loopback-boot#' + instructionId;
  bundler.require(instructionsFile, {expose: moduleName});
 }
--- a/lib/globalize.js
+++ b/lib/globalize.js
@ -1,11 +1,11 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const path = require('path');
+var path = require('path');
-const SG = require('strong-globalize');
+var SG = require('strong-globalize');
 SG.SetRootDir(path.join(__dirname, '..'), {autonomousMsgLoading: 'all'});
 module.exports = SG();
--- a/lib/plugin-base.js
+++ b/lib/plugin-base.js
@ -1,17 +1,17 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const fs = require('fs');
+var fs = require('fs');
-const path = require('path');
+var path = require('path');
-const debug = require('debug')('loopback:boot:plugin');
+var debug = require('debug')('loopback:boot:plugin');
-const assert = require('assert');
+var assert = require('assert');
-const _ = require('lodash');
+var _ = require('lodash');
-const util = require('./utils');
+var util = require('./utils');
-const g = require('./globalize');
+var g = require('./globalize');
 module.exports = PluginBase;
@ -26,11 +26,11 @@ PluginBase.prototype.getRootDir = function() {
 };
 PluginBase.prototype.load = function(context) {
-  const rootDir = this.getRootDir() || this.options.rootDir;
+  var rootDir = this.getRootDir() || this.options.rootDir;
-  const env = this.options.env;
+  var env = this.options.env;
  assert(this.name, 'Plugin name must to be set');
  debug('Root dir: %s, env: %s, artifact: %s', rootDir, env, this.artifact);
-  let config = {};
+  var config = {};
  if (this.options[this.name]) {
    // First check if options have the corresponding config object
    debug('Artifact: %s is using provided config obj instead' +
@ -67,7 +67,7 @@ PluginBase.prototype.merge = function(target, config, keyPrefix) {
 * @returns {Object}
 */
 PluginBase.prototype.loadNamed = function(rootDir, env, name) {
-  const files = this.findConfigFiles(rootDir, env, name);
+  var files = this.findConfigFiles(rootDir, env, name);
  debug('Looking in dir %s for %s configs', rootDir, this.name);
  if (files.length) {
    debug('found %s %s files: %j', env, name, files);
@ -75,8 +75,8 @@ PluginBase.prototype.loadNamed = function(rootDir, env, name) {
      debug('  %s', f);
    });
  }
-  const configs = this._loadConfigFiles(files);
+  var configs = this._loadConfigFiles(files);
-  const merged = this._mergeConfigurations(configs);
+  var merged = this._mergeConfigurations(configs);
  debug('merged %s %s configuration %j', env, name, merged);
@ -92,14 +92,14 @@ PluginBase.prototype.loadNamed = function(rootDir, env, name) {
 * @returns {Array.<String>} Array of absolute file paths.
 */
 PluginBase.prototype.findConfigFiles = function(rootDir, env, name, exts) {
-  const master = ifExists(name + '.json');
+  var master = ifExists(name + '.json');
  if (!master && (ifExistsWithAnyExt(name + '.local') ||
    ifExistsWithAnyExt(name + '.' + env))) {
    g.warn('WARNING: Main config file "%s{{.json}}" is missing', name);
  }
  if (!master) return [];
-  const candidates = [
+  var candidates = [
    master,
    ifExistsWithAnyExt(name + '.local'),
    ifExistsWithAnyExt(name + '.' + env),
@ -110,14 +110,14 @@ PluginBase.prototype.findConfigFiles = function(rootDir, env, name, exts) {
  });
  function ifExists(fileName) {
-    const filePath = path.resolve(rootDir, fileName);
+    var filePath = path.resolve(rootDir, fileName);
    return util.fileExistsSync(filePath) ? filePath : undefined;
  }
  function ifExistsWithAnyExt(fileName) {
-    const extensions = exts || ['js', 'json'];
+    var extensions = exts || ['js', 'json'];
-    let file;
+    var file;
-    for (let i = 0, n = extensions.length; i < n; i++) {
+    for (var i = 0, n = extensions.length; i < n; i++) {
      file = ifExists(fileName + '.' + extensions[i]);
      if (file) {
        return file;
@ -134,7 +134,7 @@ PluginBase.prototype.findConfigFiles = function(rootDir, env, name, exts) {
 */
 PluginBase.prototype._loadConfigFiles = function(files) {
  return files.map(function(f) {
-    let config = require(f);
+    var config = require(f);
    config = _.cloneDeep(config);
    Object.defineProperty(config, '_filename', {
      enumerable: false,
@ -149,18 +149,18 @@ PluginBase.prototype._loadConfigFiles = function(files) {
 * @param {Array.<Object>} configObjects
 */
 PluginBase.prototype._mergeConfigurations = function(configObjects) {
-  const result = configObjects.shift() || {};
+  var result = configObjects.shift() || {};
  while (configObjects.length) {
-    const next = configObjects.shift();
+    var next = configObjects.shift();
    this.merge(result, next, next._filename);
  }
  return result;
 };
 PluginBase.prototype._mergeObjects = function(target, config, keyPrefix) {
-  for (const key in config) {
+  for (var key in config) {
-    const fullKey = keyPrefix ? keyPrefix + '.' + key : key;
+    var fullKey = keyPrefix ? keyPrefix + '.' + key : key;
-    const err = this._mergeSingleItemOrProperty(target, config, key, fullKey);
+    var err = this._mergeSingleItemOrProperty(target, config, key, fullKey);
    if (err) throw err;
  }
  return null; // no error
@ -170,12 +170,12 @@ PluginBase.prototype._mergeNamedItems = function(arr1, arr2, key) {
  assert(Array.isArray(arr1), 'invalid array: ' + arr1);
  assert(Array.isArray(arr2), 'invalid array: ' + arr2);
  key = key || 'name';
-  const result = [].concat(arr1);
+  var result = [].concat(arr1);
-  for (let i = 0, n = arr2.length; i < n; i++) {
+  for (var i = 0, n = arr2.length; i < n; i++) {
-    const item = arr2[i];
+    var item = arr2[i];
-    let found = false;
+    var found = false;
    if (item[key]) {
-      for (let j = 0, k = result.length; j < k; j++) {
+      for (var j = 0, k = result.length; j < k; j++) {
        if (result[j][key] === item[key]) {
          this._mergeObjects(result[j], item);
          found = true;
@ -192,8 +192,8 @@ PluginBase.prototype._mergeNamedItems = function(arr1, arr2, key) {
 PluginBase.prototype._mergeSingleItemOrProperty =
  function(target, config, key, fullKey) {
-    const origValue = target[key];
+    var origValue = target[key];
-    const newValue = config[key];
+    var newValue = config[key];
    if (!hasCompatibleType(origValue, newValue)) {
      return 'Cannot merge values of incompatible types for the option `' +
@ -219,9 +219,9 @@ PluginBase.prototype._mergeArrays = function(target, config, keyPrefix) {
  }
  // Use for(;;) to iterate over undefined items, for(in) would skip them.
-  for (let ix = 0; ix < target.length; ix++) {
+  for (var ix = 0; ix < target.length; ix++) {
-    const fullKey = keyPrefix + '[' + ix + ']';
+    var fullKey = keyPrefix + '[' + ix + ']';
-    const err = this._mergeSingleItemOrProperty(target, config, ix, fullKey);
+    var err = this._mergeSingleItemOrProperty(target, config, ix, fullKey);
    if (err) return err;
  }
@ -244,10 +244,10 @@ function hasCompatibleType(origValue, newValue) {
 }
 PluginBase.prototype.compile = function(context) {
-  let instructions;
+  var instructions;
  if (typeof this.buildInstructions === 'function') {
-    const rootDir = this.options.rootDir;
+    var rootDir = this.options.rootDir;
-    const config = context.configurations[this.name] || {};
+    var config = context.configurations[this.name] || {};
    instructions = this.buildInstructions(context, rootDir, config);
  } else {
    instructions = context.configurations[this.name];
@ -265,12 +265,12 @@ PluginBase.prototype.compile = function(context) {
  return undefined;
 };
-const DYNAMIC_CONFIG_PARAM = /\$\{(\w+)\}$/;
+var DYNAMIC_CONFIG_PARAM = /\$\{(\w+)\}$/;
 function getConfigVariable(app, param, useEnvVars) {
-  let configVariable = param;
+  var configVariable = param;
-  const match = configVariable.match(DYNAMIC_CONFIG_PARAM);
+  var match = configVariable.match(DYNAMIC_CONFIG_PARAM);
  if (match) {
-    const varName = match[1];
+    var varName = match[1];
    if (useEnvVars && process.env[varName] !== undefined) {
      debug('Dynamic Configuration: Resolved via process.env: %s as %s',
        process.env[varName], param);
@ -278,7 +278,7 @@ function getConfigVariable(app, param, useEnvVars) {
    } else if (app.get(varName) !== undefined) {
      debug('Dynamic Configuration: Resolved via app.get(): %s as %s',
        app.get(varName), param);
-      const appValue = app.get(varName);
+      var appValue = app.get(varName);
      configVariable = appValue;
    } else {
      // previously it returns the original string such as "${restApiRoot}"
@ -287,7 +287,7 @@ function getConfigVariable(app, param, useEnvVars) {
      configVariable = undefined;
      g.warn('%s does not resolve to a valid value, returned as %s. ' +
        '"%s" must be resolvable in Environment variable or by {{app.get()}}.',
-      param, configVariable, varName);
+        param, configVariable, varName);
      debug('Dynamic Configuration: Cannot resolve variable for `%s`, ' +
        'returned as %s', varName, configVariable);
    }
@ -296,8 +296,8 @@ function getConfigVariable(app, param, useEnvVars) {
 }
 PluginBase.prototype.getUpdatedConfigObject = function(context, config, opts) {
-  const app = context.app;
+  var app = context.app;
-  const useEnvVars = opts && opts.useEnvVars;
+  var useEnvVars = opts && opts.useEnvVars;
  function interpolateVariables(config) {
    // config is a string and contains a config variable ('${var}')
@ -317,9 +317,9 @@ PluginBase.prototype.getUpdatedConfigObject = function(context, config, opts) {
      return config;
    // recurse into object props
-    const interpolated = {};
+    var interpolated = {};
    Object.keys(config).forEach(function(configKey) {
-      const value = config[configKey];
+      var value = config[configKey];
      if (Array.isArray(value)) {
        interpolated[configKey] = value.map(interpolateVariables);
      } else if (typeof value === 'string') {
--- a/lib/plugin-loader.js
+++ b/lib/plugin-loader.js
@ -1,17 +1,17 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const util = require('util');
+var util = require('util');
-const utils = require('./utils');
+var utils = require('./utils');
-const path = require('path');
+var path = require('path');
-const async = require('async');
+var async = require('async');
-const debug = require('debug')('loopback:boot:plugin-loader');
+var debug = require('debug')('loopback:boot:plugin-loader');
-const PluginBase = require('./plugin-base');
+var PluginBase = require('./plugin-base');
-const _ = require('lodash');
+var _ = require('lodash');
 module.exports = function(options) {
  return new PluginScript(options);
@ -24,23 +24,23 @@ function PluginScript(options) {
 util.inherits(PluginScript, PluginBase);
 PluginScript.prototype.load = function(context) {
-  const options = this.options;
+  var options = this.options;
-  const appRootDir = options.rootDir;
+  var appRootDir = options.rootDir;
  // require directories
-  let pluginDirs = options.pluginDirs || []; // precedence
+  var pluginDirs = options.pluginDirs || []; // precedence
  pluginDirs = pluginDirs.concat(path.join(appRootDir, 'plugins'));
  utils.resolveRelativePaths(pluginDirs, appRootDir);
-  let pluginScripts = options.pluginScripts || [];
+  var pluginScripts = options.pluginScripts || [];
  utils.resolveRelativePaths(pluginScripts, appRootDir);
  pluginDirs.forEach(function(dir) {
    pluginScripts = pluginScripts.concat(
-      utils.findScripts(dir, options.scriptExtensions),
+      utils.findScripts(dir, options.scriptExtensions)
    );
-    const envdir = dir + '/' + options.env;
+    var envdir = dir + '/' + options.env;
    pluginScripts = pluginScripts.concat(
-      utils.findScripts(envdir, options.scriptExtensions),
+      utils.findScripts(envdir, options.scriptExtensions)
    );
  });
@ -51,15 +51,15 @@ PluginScript.prototype.load = function(context) {
 };
 PluginScript.prototype.compile = function(context) {
-  const pluginScripts = context.configurations.pluginScripts;
+  var pluginScripts = context.configurations.pluginScripts;
  context.instructions = context.instructions || {};
-  const plugins = context.instructions.pluginScripts = {};
+  var plugins = context.instructions.pluginScripts = {};
-  const self = this;
+  var self = this;
  pluginScripts.forEach(function(ps) {
    debug('Loading %s', ps);
-    const factory = require(ps);
+    var factory = require(ps);
-    const handler = factory(self.options);
+    var handler = factory(self.options);
-    const name = handler.name || path.basename(ps, '.js');
+    var name = handler.name || path.basename(ps, '.js');
    debug('Loaded plugin name: %s', name);
    plugins[name] = handler;
  });
--- a/lib/plugins/application.js
+++ b/lib/plugins/application.js
@ -1,15 +1,15 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const util = require('util');
+var util = require('util');
-const assert = require('assert');
+var assert = require('assert');
-const semver = require('semver');
+var semver = require('semver');
-const PluginBase = require('../plugin-base');
+var PluginBase = require('../plugin-base');
-const g = require('../globalize');
+var g = require('../globalize');
 module.exports = function(options) {
  return new Application(options);
@ -22,20 +22,19 @@ function Application(options) {
 util.inherits(Application, PluginBase);
 function assertLoopBackVersion(app) {
-  const RANGE = '2.x || 3.x';
+  var RANGE = '2.x || 3.x';
-  const loopback = app.loopback;
+  var loopback = app.loopback;
  // remove any pre-release tag from the version string,
  // because semver has special treatment of pre-release versions,
  // while loopback-boot treats pre-releases the same way as regular versions
-  const version = (loopback.version || '1.0.0').replace(/-.*$/, '');
+  var version = (loopback.version || '1.0.0').replace(/-.*$/, '');
  if (!semver.satisfies(version, RANGE)) {
-    const msg = g.f(
+    var msg = g.f(
      'The `app` is powered by an incompatible loopback version %s. ' +
      'Supported versions: %s',
      loopback.version || '(unknown)',
-      RANGE,
+      RANGE);
    );
    throw new Error(msg);
  }
 }
@ -47,7 +46,7 @@ function setEnv(app, env) {
 function setHost(app, appConfig) {
  // jscs:disable requireCamelCaseOrUpperCaseIdentifiers
-  const host =
+  var host =
    process.env.npm_config_host ||
    process.env.OPENSHIFT_SLS_IP ||
    process.env.OPENSHIFT_NODEJS_IP ||
@ -65,7 +64,7 @@ function setHost(app, appConfig) {
 function setPort(app, appConfig) {
  // jscs:disable requireCamelCaseOrUpperCaseIdentifiers
-  const port = find([
+  var port = find([
    process.env.npm_config_port,
    process.env.OPENSHIFT_SLS_PORT,
    process.env.OPENSHIFT_NODEJS_PORT,
@ -80,7 +79,7 @@ function setPort(app, appConfig) {
  });
  if (port !== undefined) {
-    const portType = typeof port;
+    var portType = typeof port;
    assert(portType === 'string' || portType === 'number',
      'app.port must be a string or number');
    app.set('port', port);
@ -92,7 +91,7 @@ function find(array, predicate) {
 }
 function setApiRoot(app, appConfig) {
-  const restApiRoot =
+  var restApiRoot =
    appConfig.restApiRoot ||
    app.get('restApiRoot') ||
    '/api';
@ -106,8 +105,8 @@ function setApiRoot(app, appConfig) {
 }
 function applyAppConfig(app, appConfig) {
-  for (const configKey in appConfig) {
+  for (var configKey in appConfig) {
-    const cur = app.get(configKey);
+    var cur = app.get(configKey);
    if (cur === undefined || cur === null) {
      app.set(configKey, appConfig[configKey]);
    }
@ -115,10 +114,11 @@ function applyAppConfig(app, appConfig) {
 }
 Application.prototype.starting = function(context) {
-  const app = context.app;
+  var app = context.app;
  app.booting = true;
  assertLoopBackVersion(app);
-  const appConfig = context.instructions.application;
+  var appConfig = context.instructions.application;
  setEnv(app, context.instructions.env || this.options.env);
  setHost(app, appConfig);
  setPort(app, appConfig);
@ -127,7 +127,8 @@ Application.prototype.starting = function(context) {
 };
 Application.prototype.started = function(context, done) {
-  const app = context.app;
+  var app = context.app;
  app.booting = false;
  process.nextTick(function() {
    app.emit('booted');
    done();
--- a/lib/plugins/boot-script.js
+++ b/lib/plugins/boot-script.js
@ -1,18 +1,18 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const util = require('util');
+var util = require('util');
-const utils = require('../utils');
+var utils = require('../utils');
-const path = require('path');
+var path = require('path');
-const async = require('async');
+var async = require('async');
-const debug = require('debug')('loopback:boot:script');
+var debug = require('debug')('loopback:boot:script');
-const PluginBase = require('../plugin-base');
+var PluginBase = require('../plugin-base');
-const _ = require('lodash');
+var _ = require('lodash');
-const g = require('../globalize');
+var g = require('../globalize');
 module.exports = function(options) {
  return new Script(options);
@ -25,23 +25,23 @@ function Script(options) {
 util.inherits(Script, PluginBase);
 Script.prototype.load = function(context) {
-  const options = this.options;
+  var options = this.options;
-  const appRootDir = options.rootDir;
+  var appRootDir = options.rootDir;
  // require directories
-  let bootDirs = options.bootDirs || []; // precedence
+  var bootDirs = options.bootDirs || []; // precedence
  bootDirs = bootDirs.concat(path.join(appRootDir, 'boot'));
  utils.resolveRelativePaths(bootDirs, appRootDir);
-  let bootScripts = options.bootScripts || [];
+  var bootScripts = options.bootScripts || [];
  utils.resolveRelativePaths(bootScripts, appRootDir);
  bootDirs.forEach(function(dir) {
    bootScripts = bootScripts.concat(
-      utils.findScripts(dir, options.scriptExtensions),
+      utils.findScripts(dir, options.scriptExtensions)
    );
-    const envdir = dir + '/' + options.env;
+    var envdir = dir + '/' + options.env;
    bootScripts = bootScripts.concat(
-      utils.findScripts(envdir, options.scriptExtensions),
+      utils.findScripts(envdir, options.scriptExtensions)
    );
  });
@ -54,19 +54,18 @@ Script.prototype.load = function(context) {
 };
 Script.prototype.start = function(context, done) {
-  const app = context.app;
+  var app = context.app;
-  const instructions = context.instructions[this.name];
+  var instructions = context.instructions[this.name];
  runScripts(app, instructions, done);
 };
 function runScripts(app, list, callback) {
  list = list || [];
-  const functions = [];
+  var functions = [];
  list.forEach(function(filepath) {
    debug('Requiring script %s', filepath);
    try {
-      let exports = require(filepath);
+      var exports = require(filepath);
      if (exports.__esModule) exports = exports.default;
      if (typeof exports === 'function') {
        debug('Exported function detected %s', filepath);
        functions.push({
@ -82,24 +81,23 @@ function runScripts(app, list, callback) {
  async.eachSeries(functions, function(f, done) {
    debug('Running script %s', f.path);
-    let cb = function(err) {
+    if (f.func.length >= 2) {
-      debug('Async function %s %s', err ? 'failed' : 'finished', f.path);
+      debug('Starting async function %s', f.path);
-      done(err);
+      f.func(app, function(err) {
-      // Make sure done() isn't called twice, e.g. if a script returns a
+        debug('Async function finished %s', f.path);
-      // thenable object and also calls the passed callback.
+        done(err);
-      cb = function() {};
+      });
-    };
+    } else {
-    try {
+      debug('Starting sync function %s', f.path);
-      const result = f.func(app, cb);
+      var error;
-      if (result && typeof result.then === 'function') {
+      try {
-        result.then(function() { cb(); }, cb);
+        f.func(app);
      } else if (f.func.length < 2) {
        debug('Sync function finished %s', f.path);
-        done();
+      } catch (err) {
        debug('Sync function failed %s', f.path, err);
        error = err;
      }
-    } catch (err) {
+      done(error);
      debug('Sync function failed %s', f.path, err);
      done(err);
    }
  }, callback);
 }
--- a/lib/plugins/component.js
+++ b/lib/plugins/component.js
@ -1,17 +1,17 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const util = require('util');
+var util = require('util');
-const debug = require('debug')('loopback:boot:component');
+var debug = require('debug')('loopback:boot:component');
-const PluginBase = require('../plugin-base');
+var PluginBase = require('../plugin-base');
-const utils = require('../utils');
+var utils = require('../utils');
-const resolveAppScriptPath = utils.resolveAppScriptPath;
+var resolveAppScriptPath = utils.resolveAppScriptPath;
 module.exports = function(options) {
  return new Component(options);
@ -23,7 +23,7 @@ function Component(options) {
 util.inherits(Component, PluginBase);
-Component.prototype.getRootDir = function() {
+Component.prototype.getRootDir =  function() {
  return this.options.componentRootDir || this.options.rootDir;
 };
@ -40,11 +40,11 @@ Component.prototype.buildInstructions = function(context, rootDir, config) {
 };
 Component.prototype.start = function(context) {
-  const app = context.app;
+  var app = context.app;
-  const self = this;
+  var self = this;
  context.instructions[this.name].forEach(function(data) {
    debug('Configuring component %j', data.sourceFile);
-    const configFn = require(data.sourceFile);
+    var configFn = require(data.sourceFile);
    data.config = self.getUpdatedConfigObject(context, data.config,
      {useEnvVars: true});
    configFn(app, data.config);
--- a/lib/plugins/datasource.js
+++ b/lib/plugins/datasource.js
@ -1,14 +1,14 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const util = require('util');
+var util = require('util');
-const utils = require('../utils');
+var utils = require('../utils');
-const PluginBase = require('../plugin-base');
+var PluginBase = require('../plugin-base');
-const debug = require('debug')('loopback:boot:datasource');
+var debug = require('debug')('loopback:boot:datasource');
 module.exports = function(options) {
  return new DataSource(options);
@ -25,9 +25,9 @@ DataSource.prototype.getRootDir = function() {
 };
 DataSource.prototype.start = function(context) {
-  const app = context.app;
+  var app = context.app;
-  const self = this;
+  var self = this;
-  const lazyConnect = process.env.LB_LAZYCONNECT_DATASOURCES;
+  var lazyConnect = process.env.LB_LAZYCONNECT_DATASOURCES;
  utils.forEachKeyedObject(context.instructions[this.name], function(key, obj) {
    obj = self.getUpdatedConfigObject(context, obj, {useEnvVars: true});
    debug('Registering data source %s %j', key, obj);
--- a/lib/plugins/middleware.js
+++ b/lib/plugins/middleware.js
@ -1,22 +1,22 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const util = require('util');
+var util = require('util');
-const assert = require('assert');
+var assert = require('assert');
-const path = require('path');
+var path = require('path');
-const _ = require('lodash');
+var _ = require('lodash');
-const cloneDeepWith = _.cloneDeepWith;
+var cloneDeepWith = _.cloneDeepWith;
-const cloneDeep = _.cloneDeep;
+var cloneDeep = _.cloneDeep;
-const debug = require('debug')('loopback:boot:middleware');
+var debug = require('debug')('loopback:boot:middleware');
-const PluginBase = require('../plugin-base');
+var PluginBase = require('../plugin-base');
-const utils = require('../utils');
+var utils = require('../utils');
-const g = require('../globalize');
+var g = require('../globalize');
-const resolveAppScriptPath = utils.resolveAppScriptPath;
+var resolveAppScriptPath = utils.resolveAppScriptPath;
 module.exports = function(options) {
  return new Middleware(options);
@ -33,7 +33,7 @@ Middleware.prototype.getRootDir = function() {
 };
 Middleware.prototype.merge = function(target, config, fileName) {
-  let err, phase;
+  var err, phase;
  for (phase in config) {
    if (phase in target) {
      err = this.mergePhaseConfig(target[phase], config[phase], phase);
@ -46,11 +46,11 @@ Middleware.prototype.merge = function(target, config, fileName) {
 };
 Middleware.prototype.mergePhaseConfig = function(target, config, phase) {
-  let err, mw;
+  var err, mw;
  for (mw in config) {
    if (mw in target) {
-      const targetMiddleware = target[mw];
+      var targetMiddleware = target[mw];
-      const configMiddleware = config[mw];
+      var configMiddleware = config[mw];
      if (Array.isArray(targetMiddleware) && Array.isArray(configMiddleware)) {
        // Both are arrays, combine them
        target[mw] = this._mergeNamedItems(targetMiddleware, configMiddleware);
@ -83,18 +83,18 @@ Middleware.prototype.mergePhaseConfig = function(target, config, phase) {
 };
 Middleware.prototype.buildInstructions = function(context, rootDir, config) {
-  const phasesNames = Object.keys(config);
+  var phasesNames = Object.keys(config);
-  const middlewareList = [];
+  var middlewareList = [];
  phasesNames.forEach(function(phase) {
-    const phaseConfig = config[phase];
+    var phaseConfig = config[phase];
    Object.keys(phaseConfig).forEach(function(middleware) {
-      let allConfigs = phaseConfig[middleware];
+      var allConfigs = phaseConfig[middleware];
      if (!Array.isArray(allConfigs))
        allConfigs = [allConfigs];
      allConfigs.forEach(function(config) {
-        const resolved = resolveMiddlewarePath(rootDir, middleware, config);
+        var resolved = resolveMiddlewarePath(rootDir, middleware, config);
        // resolved.sourceFile will be false-y if an optional middleware
        // is not resolvable.
        // if a non-optional middleware is not resolvable, it will throw
@ -102,19 +102,19 @@ Middleware.prototype.buildInstructions = function(context, rootDir, config) {
        if (!resolved.sourceFile) {
          return g.log('Middleware "%s" not found: %s',
            middleware,
-            resolved.optional);
+            resolved.optional
          );
        }
-        const middlewareConfig = cloneDeep(config);
+        var middlewareConfig = cloneDeep(config);
        middlewareConfig.phase = phase;
        if (middlewareConfig.params) {
          middlewareConfig.params = resolveMiddlewareParams(
-            rootDir, middlewareConfig.params,
+            rootDir, middlewareConfig.params);
          );
        }
-        const item = {
+        var item = {
          sourceFile: resolved.sourceFile,
          config: middlewareConfig,
        };
@ -126,7 +126,7 @@ Middleware.prototype.buildInstructions = function(context, rootDir, config) {
    });
  });
-  const flattenedPhaseNames = phasesNames
+  var flattenedPhaseNames = phasesNames
    .map(function getBaseName(name) {
      return name.replace(/:[^:]+$/, '');
    })
@ -143,15 +143,15 @@ Middleware.prototype.buildInstructions = function(context, rootDir, config) {
 };
 function resolveMiddlewarePath(rootDir, middleware, config) {
-  const resolved = {
+  var resolved = {
    optional: !!config.optional,
  };
-  const segments = middleware.split('#');
+  var segments = middleware.split('#');
-  let pathName = segments[0];
+  var pathName = segments[0];
-  const fragment = segments[1];
+  var fragment = segments[1];
-  const middlewarePath = pathName;
+  var middlewarePath = pathName;
-  const opts = {
+  var opts = {
    strict: true,
    optional: !!config.optional,
  };
@ -165,7 +165,7 @@ function resolveMiddlewarePath(rootDir, middleware, config) {
    pathName = path.resolve(rootDir, pathName);
  }
-  const resolveOpts = _.extend(opts, {
+  var resolveOpts = _.extend(opts, {
    // Workaround for strong-agent to allow probes to detect that
    // strong-express-middleware was loaded: exclude the path to the
    // module main file from the source file path.
@ -175,7 +175,7 @@ function resolveMiddlewarePath(rootDir, middleware, config) {
    //   node_modules/strong-express-metrics/index.js
    fullResolve: false,
  });
-  const sourceFile = resolveAppScriptPath(rootDir, middlewarePath, resolveOpts);
+  var sourceFile = resolveAppScriptPath(rootDir, middlewarePath, resolveOpts);
  if (!fragment) {
    resolved.sourceFile = sourceFile;
@ -184,7 +184,7 @@ function resolveMiddlewarePath(rootDir, middleware, config) {
  // Try to require the module and check if <module>.<fragment> is a valid
  // function
-  const m = require(sourceFile);
+  var m = require(sourceFile);
  if (typeof m[fragment] === 'function') {
    resolved.sourceFile = sourceFile;
    return resolved;
@ -194,7 +194,7 @@ function resolveMiddlewarePath(rootDir, middleware, config) {
   * module/server/middleware/fragment
   * module/middleware/fragment
   */
-  const candidates = [
+  var candidates = [
    pathName + '/server/middleware/' + fragment,
    pathName + '/middleware/' + fragment,
    // TODO: [rfeng] Should we support the following flavors?
@ -202,7 +202,7 @@ function resolveMiddlewarePath(rootDir, middleware, config) {
    // pathName + '/' + fragment
  ];
-  let err, ix;
+  var err, ix;
  for (ix in candidates) {
    try {
      resolved.sourceFile = resolveAppScriptPath(rootDir, candidates[ix], opts);
@ -217,7 +217,7 @@ function resolveMiddlewarePath(rootDir, middleware, config) {
 }
 // Match values starting with `$!./` or `$!../`
-const MIDDLEWARE_PATH_PARAM_REGEX = /^\$!(\.\/|\.\.\/)/;
+var MIDDLEWARE_PATH_PARAM_REGEX = /^\$!(\.\/|\.\.\/)/;
 function resolveMiddlewareParams(rootDir, params) {
  return cloneDeepWith(params, function resolvePathParam(value) {
@ -230,20 +230,20 @@ function resolveMiddlewareParams(rootDir, params) {
 }
 Middleware.prototype.start = function(context) {
-  const self = this;
+  var self = this;
-  const app = context.app;
+  var app = context.app;
-  const instructions = context.instructions.middleware;
+  var instructions = context.instructions.middleware;
  if (!instructions) {
    // the browserified client does not support middleware
    return;
  }
  // Phases can be empty
-  const phases = instructions.phases || [];
+  var phases = instructions.phases || [];
  assert(Array.isArray(phases),
    'Middleware phases must be an array');
-  const middleware = instructions.middleware;
+  var middleware = instructions.middleware;
  assert(Array.isArray(middleware),
    'Middleware must be an array');
@ -253,7 +253,7 @@ Middleware.prototype.start = function(context) {
  middleware.forEach(function(data) {
    debug('Configuring middleware %j%s', data.sourceFile,
      data.fragment ? ('#' + data.fragment) : '');
-    let factory = require(data.sourceFile);
+    var factory = require(data.sourceFile);
    if (data.fragment) {
      factory = factory[data.fragment].bind(factory);
    }
--- a/lib/plugins/mixin.js
+++ b/lib/plugins/mixin.js
@ -1,23 +1,23 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const util = require('util');
+var util = require('util');
-const fs = require('fs');
+var fs = require('fs');
-const path = require('path');
+var path = require('path');
-const PluginBase = require('../plugin-base');
+var PluginBase = require('../plugin-base');
-const _ = require('lodash');
+var _ = require('lodash');
-const debug = require('debug')('loopback:boot:mixin');
+var debug = require('debug')('loopback:boot:mixin');
-const utils = require('../utils');
+var utils = require('../utils');
-const g = require('../globalize');
+var g = require('../globalize');
-const tryResolveAppPath = utils.tryResolveAppPath;
+var tryResolveAppPath = utils.tryResolveAppPath;
-const getExcludedExtensions = utils.getExcludedExtensions;
+var getExcludedExtensions = utils.getExcludedExtensions;
-const findScripts = utils.findScripts;
+var findScripts = utils.findScripts;
-const FILE_EXTENSION_JSON = utils.FILE_EXTENSION_JSON;
+var FILE_EXTENSION_JSON = utils.FILE_EXTENSION_JSON;
 module.exports = function(options) {
  return new Mixin(options);
@ -30,31 +30,30 @@ function Mixin(options) {
 util.inherits(Mixin, PluginBase);
 Mixin.prototype.buildInstructions = function(context, rootDir, config) {
-  const modelsMeta = context.configurations.mixins._meta || {};
+  var modelsMeta = context.configurations.mixins._meta || {};
-  const modelInstructions = context.instructions.models;
+  var modelInstructions = context.instructions.models;
-  const mixinSources = this.options.mixinSources || modelsMeta.mixins ||
+  var mixinSources = this.options.mixinSources || modelsMeta.mixins ||
    ['./mixins'];
-  const scriptExtensions = this.options.scriptExtensions || require.extensions;
+  var scriptExtensions = this.options.scriptExtensions || require.extensions;
-  const mixinInstructions = buildAllMixinInstructions(
+  var mixinInstructions = buildAllMixinInstructions(
-    rootDir, this.options, mixinSources, scriptExtensions, modelInstructions,
+    rootDir, this.options, mixinSources, scriptExtensions, modelInstructions);
  );
  return mixinInstructions;
 };
 function buildAllMixinInstructions(appRootDir, options, mixinSources,
-  scriptExtensions, modelInstructions) {
+                                   scriptExtensions, modelInstructions) {
  // load mixins from `options.mixins`
-  let sourceFiles = options.mixins || [];
+  var sourceFiles = options.mixins || [];
-  const mixinDirs = options.mixinDirs || [];
+  var mixinDirs = options.mixinDirs || [];
-  const instructionsFromMixins = loadMixins(sourceFiles, options.normalization);
+  var instructionsFromMixins = loadMixins(sourceFiles, options.normalization);
  // load mixins from `options.mixinDirs`
  sourceFiles = findMixinDefinitions(appRootDir, mixinDirs, scriptExtensions);
  if (sourceFiles === undefined) return;
-  const instructionsFromMixinDirs = loadMixins(sourceFiles,
+  var instructionsFromMixinDirs = loadMixins(sourceFiles,
-    options.normalization);
+                                             options.normalization);
  /* If `mixinDirs` and `mixinSources` have any directories in common,
   * then remove the common directories from `mixinSources` */
@ -62,33 +61,31 @@ function buildAllMixinInstructions(appRootDir, options, mixinSources,
  // load mixins from `options.mixinSources`
  sourceFiles = findMixinDefinitions(appRootDir, mixinSources,
-    scriptExtensions);
+                                     scriptExtensions);
  if (sourceFiles === undefined) return;
-  let instructionsFromMixinSources = loadMixins(sourceFiles,
+  var instructionsFromMixinSources = loadMixins(sourceFiles,
-    options.normalization);
+                                                options.normalization);
  // Fetch unique list of mixin names, used in models
-  let modelMixins = fetchMixinNamesUsedInModelInstructions(modelInstructions);
+  var modelMixins = fetchMixinNamesUsedInModelInstructions(modelInstructions);
  modelMixins = _.uniq(modelMixins);
  // Filter-in only mixins, that are used in models
  instructionsFromMixinSources = filterMixinInstructionsUsingWhitelist(
-    instructionsFromMixinSources, modelMixins,
+    instructionsFromMixinSources, modelMixins);
  );
-  const mixins = _.assign(
+  var mixins = _.assign(
    instructionsFromMixins,
    instructionsFromMixinDirs,
-    instructionsFromMixinSources,
+    instructionsFromMixinSources);
  );
  return _.values(mixins);
 }
 function findMixinDefinitions(appRootDir, sourceDirs, scriptExtensions) {
-  let files = [];
+  var files = [];
  sourceDirs.forEach(function(dir) {
-    const path = tryResolveAppPath(appRootDir, dir);
+    var path = tryResolveAppPath(appRootDir, dir);
    if (!path) {
      debug('Skipping unknown module source dir %j', dir);
      return;
@ -99,15 +96,15 @@ function findMixinDefinitions(appRootDir, sourceDirs, scriptExtensions) {
 }
 function loadMixins(sourceFiles, normalization) {
-  const mixinInstructions = {};
+  var mixinInstructions = {};
  sourceFiles.forEach(function(filepath) {
-    const dir = path.dirname(filepath);
+    var dir = path.dirname(filepath);
-    const ext = path.extname(filepath);
+    var ext = path.extname(filepath);
-    let name = path.basename(filepath, ext);
+    var name = path.basename(filepath, ext);
-    const metafile = path.join(dir, name + FILE_EXTENSION_JSON);
+    var metafile = path.join(dir, name + FILE_EXTENSION_JSON);
    name = normalizeMixinName(name, normalization);
-    const meta = {};
+    var meta = {};
    meta.name = name;
    if (utils.fileExistsSync(metafile)) {
      // May overwrite name, not sourceFile
@ -129,10 +126,10 @@ function fetchMixinNamesUsedInModelInstructions(modelInstructions) {
 }
 function filterMixinInstructionsUsingWhitelist(instructions, includeMixins) {
-  const instructionKeys = Object.keys(instructions);
+  var instructionKeys = Object.keys(instructions);
  includeMixins = _.intersection(instructionKeys, includeMixins);
-  const filteredInstructions = {};
+  var filteredInstructions = {};
  instructionKeys.forEach(function(mixinName) {
    if (includeMixins.indexOf(mixinName) !== -1) {
      filteredInstructions[mixinName] = instructions[mixinName];
@ -168,7 +165,7 @@ function normalizeMixinName(str, normalization) {
        return normalization(str);
      }
-      const err = new Error(g.f('Invalid normalization format - "%s"',
+      var err = new Error(g.f('Invalid normalization format - "%s"',
        normalization));
      err.code = 'INVALID_NORMALIZATION_FORMAT';
      throw err;
@ -176,18 +173,18 @@ function normalizeMixinName(str, normalization) {
 }
 Mixin.prototype.starting = function(context) {
-  const app = context.app;
+  var app = context.app;
-  const instructions = context.instructions.mixins;
+  var instructions = context.instructions.mixins;
-  const modelBuilder = (app.registry || app.loopback).modelBuilder;
+  var modelBuilder = (app.registry || app.loopback).modelBuilder;
-  const BaseClass = app.loopback.Model;
+  var BaseClass = app.loopback.Model;
-  const mixins = instructions || [];
+  var mixins = instructions || [];
  if (!modelBuilder.mixins || !mixins.length) return;
  mixins.forEach(function(obj) {
    debug('Requiring mixin %s', obj.sourceFile);
-    const mixin = require(obj.sourceFile);
+    var mixin = require(obj.sourceFile);
    if (typeof mixin === 'function' || mixin.prototype instanceof BaseClass) {
      debug('Defining mixin %s', obj.name);
--- a/lib/plugins/model.js
+++ b/lib/plugins/model.js
@ -1,24 +1,24 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const assert = require('assert');
+var assert = require('assert');
-const util = require('util');
+var util = require('util');
-const PluginBase = require('../plugin-base');
+var PluginBase = require('../plugin-base');
-const path = require('path');
+var path = require('path');
-const debug = require('debug')('loopback:boot:model');
+var debug = require('debug')('loopback:boot:model');
-const _ = require('lodash');
+var _ = require('lodash');
-const toposort = require('toposort');
+var toposort = require('toposort');
-const utils = require('../utils');
+var utils = require('../utils');
-const tryReadDir = utils.tryReadDir;
+var tryReadDir = utils.tryReadDir;
-const assertIsValidConfig = utils.assertIsValidConfig;
+var assertIsValidConfig = utils.assertIsValidConfig;
-const tryResolveAppPath = utils.tryResolveAppPath;
+var tryResolveAppPath = utils.tryResolveAppPath;
-const fixFileExtension = utils.fixFileExtension;
+var fixFileExtension = utils.fixFileExtension;
-const g = require('../globalize');
+var g = require('../globalize');
 module.exports = function(options) {
  return new Model(options);
@ -35,42 +35,38 @@ Model.prototype.getRootDir = function() {
 };
 Model.prototype.load = function(context) {
-  const config = PluginBase.prototype.load.apply(this, arguments);
+  var config = PluginBase.prototype.load.apply(this, arguments);
  assertIsValidModelConfig(config);
  return config;
 };
 Model.prototype.buildInstructions = function(context, rootDir, modelsConfig) {
-  const modelsMeta = modelsConfig._meta || {};
+  var modelsMeta = modelsConfig._meta || {};
  delete modelsConfig._meta;
  context.configurations.mixins._meta = modelsMeta;
-  const modelSources = this.options.modelSources || modelsMeta.sources ||
+  var modelSources = this.options.modelSources || modelsMeta.sources ||
    ['./models'];
-  const modelInstructions = buildAllModelInstructions(
+  var modelInstructions = buildAllModelInstructions(
    rootDir, modelsConfig, modelSources, this.options.modelDefinitions,
-    this.options.scriptExtensions,
+    this.options.scriptExtensions);
  );
  return modelInstructions;
 };
 function buildAllModelInstructions(rootDir, modelsConfig, sources,
-  modelDefinitions, scriptExtensions) {
+                                   modelDefinitions, scriptExtensions) {
-  let registry = verifyModelDefinitions(rootDir, modelDefinitions,
+  var registry = verifyModelDefinitions(rootDir, modelDefinitions,
-    scriptExtensions);
+                  scriptExtensions);
  if (!registry) {
    registry = findModelDefinitions(rootDir, sources, scriptExtensions);
  }
-  const modelNamesToBuild = addAllBaseModels(
+  var modelNamesToBuild = addAllBaseModels(registry, Object.keys(modelsConfig));
    registry,
    Object.keys(modelsConfig),
  );
-  const instructions = modelNamesToBuild
+  var instructions = modelNamesToBuild
    .map(function createModelInstructions(name) {
-      const config = modelsConfig[name];
+      var config = modelsConfig[name];
-      const definition = registry[name] || {};
+      var definition = registry[name] || {};
      debug('Using model "%s"\nConfiguration: %j\nDefinition %j',
        name, config, definition.definition);
@ -87,20 +83,20 @@ function buildAllModelInstructions(rootDir, modelsConfig, sources,
 }
 function addAllBaseModels(registry, modelNames) {
-  const result = [];
+  var result = [];
-  const visited = {};
+  var visited = {};
  while (modelNames.length) {
-    const name = modelNames.shift();
+    var name = modelNames.shift();
    if (visited[name]) continue;
    visited[name] = true;
    result.push(name);
-    const definition = registry[name] && registry[name].definition;
+    var definition = registry[name] && registry[name].definition;
    if (!definition) continue;
-    const base = getBaseModelName(definition);
+    var base = getBaseModelName(definition);
    // ignore built-in models like User
    if (!registry[base]) continue;
@ -121,14 +117,14 @@ function getBaseModelName(modelDefinition) {
 function sortByInheritance(instructions) {
  // create edges Base name -> Model name
-  const edges = instructions
+  var edges = instructions
    .map(function(inst) {
      return [getBaseModelName(inst.definition), inst.name];
    });
-  const sortedNames = toposort(edges);
+  var sortedNames = toposort(edges);
-  const instructionsByModelName = {};
+  var instructionsByModelName = {};
  instructions.forEach(function(inst) {
    instructionsByModelName[inst.name] = inst;
  });
@ -149,15 +145,14 @@ function verifyModelDefinitions(rootDir, modelDefinitions, scriptExtensions) {
    return undefined;
  }
-  const registry = {};
+  var registry = {};
  modelDefinitions.forEach(function(definition, idx) {
    if (definition.sourceFile) {
-      const fullPath = path.resolve(rootDir, definition.sourceFile);
+      var fullPath = path.resolve(rootDir, definition.sourceFile);
      definition.sourceFile = fixFileExtension(
        fullPath,
        tryReadDir(path.dirname(fullPath)),
-        scriptExtensions,
+        scriptExtensions);
      );
      if (!definition.sourceFile) {
        debug('Model source code not found: %s - %s', definition.sourceFile);
@ -171,11 +166,11 @@ function verifyModelDefinitions(rootDir, modelDefinitions, scriptExtensions) {
        path.relative(rootDir, definition.sourceFile) :
        '(no source file)');
-    const modelName = definition.definition.name;
+    var modelName = definition.definition.name;
    if (!modelName) {
      debug('Skipping model definition without Model name ' +
        '(from options.modelDefinitions @ index %s)',
-      idx);
+        idx);
      return;
    }
    registry[modelName] = definition;
@ -185,26 +180,26 @@ function verifyModelDefinitions(rootDir, modelDefinitions, scriptExtensions) {
 }
 function findModelDefinitions(rootDir, sources, scriptExtensions) {
-  const registry = {};
+  var registry = {};
  sources.forEach(function(src) {
-    const srcDir = tryResolveAppPath(rootDir, src, {strict: false});
+    var srcDir = tryResolveAppPath(rootDir, src, {strict: false});
    if (!srcDir) {
      debug('Skipping unknown module source dir %j', src);
      return;
    }
-    const files = tryReadDir(srcDir);
+    var files = tryReadDir(srcDir);
    files
      .filter(function(f) {
        return f[0] !== '_' && path.extname(f) === '.json';
      })
      .forEach(function(f) {
-        const fullPath = path.resolve(srcDir, f);
+        var fullPath = path.resolve(srcDir, f);
-        const entry = loadModelDefinition(rootDir, fullPath, files,
+        var entry = loadModelDefinition(rootDir, fullPath, files,
-          scriptExtensions);
+                                        scriptExtensions);
-        const modelName = entry.definition.name;
+        var modelName = entry.definition.name;
        if (!modelName) {
          debug('Skipping model definition without Model name: %s',
            path.relative(srcDir, fullPath));
@ -218,12 +213,12 @@ function findModelDefinitions(rootDir, sources, scriptExtensions) {
 }
 function loadModelDefinition(rootDir, jsonFile, allFiles, scriptExtensions) {
-  const definition = require(jsonFile);
+  var definition = require(jsonFile);
-  const basename = path.basename(jsonFile, path.extname(jsonFile));
+  var basename = path.basename(jsonFile, path.extname(jsonFile));
  definition.name = definition.name || _.upperFirst(_.camelCase(basename));
  // find a matching file with a supported extension like `.js` or `.coffee`
-  const sourceFile = fixFileExtension(jsonFile, allFiles, scriptExtensions);
+  var sourceFile = fixFileExtension(jsonFile, allFiles, scriptExtensions);
  if (sourceFile === undefined) {
    debug('Model source code not found: %s', sourceFile);
@ -241,46 +236,44 @@ function loadModelDefinition(rootDir, jsonFile, allFiles, scriptExtensions) {
 function assertIsValidModelConfig(config) {
  assertIsValidConfig('model', config);
-  for (const name in config) {
+  for (var name in config) {
-    const entry = config[name];
+    var entry = config[name];
-    const options = entry.options || {};
+    var options = entry.options || {};
-    const unsupported = entry.properties ||
+    var unsupported = entry.properties ||
      entry.base || options.base ||
      entry.plural || options.plural;
    if (unsupported) {
      throw new Error(g.f(
        'The data in {{model-config.json}} ' +
-        'is in the unsupported {{1.x}} format.',
+        'is in the unsupported {{1.x}} format.'));
      ));
    }
  }
 }
 // Regular expression to match built-in loopback models
-const LOOPBACK_MODEL_REGEXP = new RegExp(
+var LOOPBACK_MODEL_REGEXP = new RegExp(
  ['', 'node_modules', 'loopback', '[^\\/\\\\]+', 'models', '[^\\/\\\\]+\\.js$']
-    .join('\\' + path.sep),
+    .join('\\' + path.sep));
 );
 function isBuiltinLoopBackModel(app, data) {
  // 1. Built-in models are exposed on the loopback object
  if (!app.loopback[data.name]) return false;
  // 2. Built-in models have a script file `loopback/{facet}/models/{name}.js`
-  const srcFile = data.sourceFile;
+  var srcFile = data.sourceFile;
  return srcFile &&
    LOOPBACK_MODEL_REGEXP.test(srcFile);
 }
 Model.prototype.start = function(context) {
-  const app = context.app;
+  var app = context.app;
-  const instructions = context.instructions[this.name];
+  var instructions = context.instructions[this.name];
-  const registry = app.registry || app.loopback;
+  var registry = app.registry || app.loopback;
  instructions.forEach(function(data) {
-    const name = data.name;
+    var name = data.name;
-    let model;
+    var model;
    if (!data.definition) {
      model = registry.getModel(name);
@ -297,7 +290,7 @@ Model.prototype.start = function(context) {
      model = registry.createModel(data.definition);
      if (data.sourceFile) {
        debug('Loading customization script %s', data.sourceFile);
-        const code = require(data.sourceFile);
+        var code = require(data.sourceFile);
        if (typeof code === 'function') {
          debug('Customizing model %s', name);
          code(model);
--- a/lib/plugins/swagger.js
+++ b/lib/plugins/swagger.js
@ -1,12 +1,12 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const util = require('util');
+var util = require('util');
-const PluginBase = require('../plugin-base');
+var PluginBase = require('../plugin-base');
 module.exports = function(options) {
  return new Swagger(options);
@ -19,13 +19,13 @@ function Swagger(options) {
 util.inherits(Swagger, PluginBase);
 Swagger.prototype.start = function(context) {
-  const app = context.app;
+  var app = context.app;
-  const appConfig = context.instructions.application;
+  var appConfig = context.instructions.application;
  // disable token requirement for swagger, if available
-  const swagger = app.remotes().exports.swagger;
+  var swagger = app.remotes().exports.swagger;
  if (!swagger) return;
-  const requireTokenForSwagger = appConfig.swagger &&
+  var requireTokenForSwagger = appConfig.swagger &&
    appConfig.swagger.requireToken;
  swagger.requireToken = requireTokenForSwagger || false;
 };
--- a/lib/utils.js
+++ b/lib/utils.js
@ -1,17 +1,17 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const debug = require('debug')('loopback:boot');
+var debug = require('debug')('loopback:boot');
-const path = require('path');
+var path = require('path');
-const Module = require('module');
+var Module = require('module');
-const fs = require('fs');
+var fs = require('fs');
-const assert = require('assert');
+var assert = require('assert');
-const _ = require('lodash');
+var _ = require('lodash');
-const g = require('./globalize');
+var g = require('./globalize');
 exports.arrayToObject = arrayToObject;
 exports.tryReadDir = tryReadDir;
@ -26,7 +26,7 @@ exports.tryResolveAppPath = tryResolveAppPath;
 exports.forEachKeyedObject = forEachKeyedObject;
 exports.mergePhaseNameLists = mergePhaseNameLists;
-const FILE_EXTENSION_JSON = exports.FILE_EXTENSION_JSON = '.json';
+var FILE_EXTENSION_JSON = exports.FILE_EXTENSION_JSON = '.json';
 /**
 * Find all javascript files (except for those prefixed with _)
 * and all directories.
@ -37,7 +37,7 @@ const FILE_EXTENSION_JSON = exports.FILE_EXTENSION_JSON = '.json';
 function findScripts(dir, scriptExtensions) {
  assert(dir, 'cannot require directory contents without directory name');
-  const files = tryReadDir(dir);
+  var files = tryReadDir(dir);
  scriptExtensions = scriptExtensions || require.extensions;
  // sort files in lowercase alpha for linux
@ -54,15 +54,15 @@ function findScripts(dir, scriptExtensions) {
    }
  });
-  const results = [];
+  var results = [];
  files.forEach(function(filename) {
    // ignore index.js and files prefixed with underscore
    if (filename === 'index.js' || filename[0] === '_') {
      return;
    }
-    const filepath = path.resolve(path.join(dir, filename));
+    var filepath = path.resolve(path.join(dir, filename));
-    const stats = fs.statSync(filepath);
+    var stats = fs.statSync(filepath);
    // only require files supported by specified extensions
    if (stats.isFile()) {
@ -87,13 +87,9 @@ function tryReadDir() {
 }
 function resolveRelativePaths(relativePaths, appRootDir) {
-  const resolveOpts = {strict: false};
+  var resolveOpts = {strict: false};
  relativePaths.forEach(function(relativePath, k) {
-    const resolvedPath = tryResolveAppPath(
+    var resolvedPath = tryResolveAppPath(appRootDir, relativePath, resolveOpts);
      appRootDir,
      relativePath,
      resolveOpts,
    );
    if (resolvedPath !== undefined) {
      relativePaths[k] = resolvedPath;
    } else {
@ -106,7 +102,7 @@ function getExcludedExtensions() {
  return {
    '.json': '.json',
    '.node': 'node',
-    /**
+   /**
     * This is a temporary workaround for #246
     * See discussion here for full description of the underlying issue
     * https://github.com/strongloop/loopback-boot/pull/245#issuecomment-311052798
@ -125,28 +121,28 @@ function arrayToObject(array) {
 function isPreferredExtension(filename, includeExtensions) {
  assert(!!includeExtensions, '"includeExtensions" argument is required');
-  const ext = path.extname(filename);
+  var ext = path.extname(filename);
  return (ext in includeExtensions) && !(ext in getExcludedExtensions());
 }
 function fixFileExtension(filepath, files, scriptExtensions) {
-  const results = [];
+  var results = [];
-  let otherFile;
+  var otherFile;
  /* Prefer coffee scripts over json */
  if (scriptExtensions && isPreferredExtension(filepath, scriptExtensions)) {
    return filepath;
  }
-  const basename = path.basename(filepath, FILE_EXTENSION_JSON);
+  var basename = path.basename(filepath, FILE_EXTENSION_JSON);
-  const sourceDir = path.dirname(filepath);
+  var sourceDir = path.dirname(filepath);
  files.forEach(function(f) {
    otherFile = path.resolve(sourceDir, f);
-    const stats = fs.statSync(otherFile);
+    var stats = fs.statSync(otherFile);
    if (stats.isFile()) {
-      const otherFileExtension = path.extname(f);
+      var otherFileExtension = path.extname(f);
      if (!(otherFileExtension in getExcludedExtensions()) &&
        path.basename(f, otherFileExtension) == basename) {
@ -160,9 +156,9 @@ function fixFileExtension(filepath, files, scriptExtensions) {
 }
 function resolveAppPath(rootDir, relativePath, resolveOptions) {
-  const resolvedPath = tryResolveAppPath(rootDir, relativePath, resolveOptions);
+  var resolvedPath = tryResolveAppPath(rootDir, relativePath, resolveOptions);
  if (resolvedPath === undefined && !resolveOptions.optional) {
-    const err = new Error(g.f('Cannot resolve path "%s"', relativePath));
+    var err = new Error(g.f('Cannot resolve path "%s"', relativePath));
    err.code = 'PATH_NOT_FOUND';
    throw err;
  }
@ -170,19 +166,19 @@ function resolveAppPath(rootDir, relativePath, resolveOptions) {
 }
 function resolveAppScriptPath(rootDir, relativePath, resolveOptions) {
-  const resolvedPath = resolveAppPath(rootDir, relativePath, resolveOptions);
+  var resolvedPath = resolveAppPath(rootDir, relativePath, resolveOptions);
  if (!resolvedPath) {
    return false;
  }
-  const sourceDir = path.dirname(resolvedPath);
+  var sourceDir = path.dirname(resolvedPath);
-  const files = tryReadDir(sourceDir);
+  var files = tryReadDir(sourceDir);
-  const fixedFile = fixFileExtension(resolvedPath, files);
+  var fixedFile = fixFileExtension(resolvedPath, files);
  return (fixedFile === undefined ? resolvedPath : fixedFile);
 }
 function tryResolveAppPath(rootDir, relativePath, resolveOptions) {
-  let fullPath;
+  var fullPath;
-  const start = relativePath.substring(0, 2);
+  var start = relativePath.substring(0, 2);
  /* In order to retain backward compatibility, we need to support
   * two ways how to treat values that are not relative nor absolute
@ -193,7 +189,7 @@ function tryResolveAppPath(rootDir, relativePath, resolveOptions) {
   */
  resolveOptions = resolveOptions || {strict: true};
-  let isModuleRelative = false;
+  var isModuleRelative = false;
  if (relativePath[0] === '/') {
    fullPath = relativePath;
  } else if (start === './' || start === '..') {
@ -226,17 +222,17 @@ function tryResolveAppPath(rootDir, relativePath, resolveOptions) {
  //   [ env.NODE_PATH values, $HOME/.node_modules, etc. ]
  // Module._nodeModulePaths(rootDir) returns a list of paths like
  //   [ rootDir/node_modules, rootDir/../node_modules, etc. ]
-  const modulePaths = Module.globalPaths
+  var modulePaths = Module.globalPaths
    .concat(Module._nodeModulePaths(rootDir));
  fullPath = modulePaths
    .map(function(candidateDir) {
-      const absPath = path.join(candidateDir, relativePath);
+      var absPath = path.join(candidateDir, relativePath);
      try {
        // NOTE(bajtos) We need to create a proper String object here,
        // otherwise we can't attach additional properties to it
        /* jshint -W053 */
-        const filePath = new String(require.resolve(absPath));
+        var filePath = new String(require.resolve(absPath));
        filePath.unresolvedPath = absPath;
        return filePath;
      } catch (err) {
@ -314,8 +310,8 @@ function forEachKeyedObject(obj, fn) {
 function mergePhaseNameLists(currentNames, namesToMerge) {
  if (!namesToMerge.length) return currentNames.slice();
-  const targetArray = currentNames.slice();
+  var targetArray = currentNames.slice();
-  let targetIx = targetArray.indexOf(namesToMerge[0]);
+  var targetIx = targetArray.indexOf(namesToMerge[0]);
  if (targetIx === -1) {
    // the first new item does not match any existing one
@ -325,21 +321,21 @@ function mergePhaseNameLists(currentNames, namesToMerge) {
  }
  // merge (zip) two arrays
-  for (let sourceIx = 1; sourceIx < namesToMerge.length; sourceIx++) {
+  for (var sourceIx = 1; sourceIx < namesToMerge.length; sourceIx++) {
-    const valueToAdd = namesToMerge[sourceIx];
+    var valueToAdd = namesToMerge[sourceIx];
-    const previousValue = namesToMerge[sourceIx - 1];
+    var previousValue = namesToMerge[sourceIx - 1];
-    const existingIx = targetArray.indexOf(valueToAdd, targetIx);
+    var existingIx = targetArray.indexOf(valueToAdd, targetIx);
    if (existingIx === -1) {
      // A new phase - try to add it after the last one,
      // unless it was already registered
      if (targetArray.indexOf(valueToAdd) !== -1) {
-        const errMsg = g.f('Ordering conflict: cannot add "%s' +
+        var errMsg = g.f('Ordering conflict: cannot add "%s' +
          '" after "%s", because the opposite order was ' +
          ' already specified', valueToAdd, previousValue);
        throw new Error(errMsg);
      }
-      const previousIx = targetArray.indexOf(previousValue);
+      var previousIx = targetArray.indexOf(previousValue);
      targetArray.splice(previousIx + 1, 0, valueToAdd);
    } else {
      // An existing phase - move the pointer
--- a/package.json
+++ b/package.json
@ -1,6 +1,9 @@
 {
  "name": "loopback-boot",
-  "version": "3.3.1",
+  "version": "3.1.0",
  "publishConfig": {
    "tag": "next"
  },
  "description": "Convention-based bootstrapper for LoopBack applications",
  "keywords": [
    "StrongLoop",
@ -13,39 +16,37 @@
    "url": "https://github.com/strongloop/loopback-boot"
  },
  "engines": {
-    "node": ">=8"
+    "node": ">=4.0.0"
  },
  "main": "index.js",
  "browser": "browser.js",
  "scripts": {
    "test": "mocha",
    "posttest": "npm run lint",
-    "lint": "eslint .",
+    "lint": "eslint ."
    "lint:fix": "eslint . --fix"
  },
  "license": "MIT",
  "dependencies": {
    "async": "^2.4.0",
-    "bluebird": "^3.5.3",
+    "bluebird": "^3.4.0",
    "commondir": "^1.0.1",
-    "debug": "^4.1.1",
+    "debug": "^2.2.0",
-    "lodash": "^4.17.11",
+    "lodash": "^4.13.1",
    "semver": "^5.1.0",
-    "strong-globalize": "^4.1.1",
+    "strong-globalize": "^3.1.0",
-    "toposort": "^2.0.2"
+    "toposort": "^1.0.0"
  },
  "devDependencies": {
-    "browserify": "^16.2.3",
+    "browserify": "^4.2.3",
-    "chai": "^4.2.0",
+    "chai": "^3.5.0",
-    "coffeeify": "^3.0.1",
+    "coffee-script": "^1.10.0",
-    "coffeescript": "^2.3.1",
+    "coffeeify": "^2.0.1",
-    "dirty-chai": "^2.0.1",
+    "dirty-chai": "^1.2.2",
-    "eslint": "^6.6.0",
+    "eslint": "^3.19.0",
-    "eslint-config-loopback": "^13.1.0",
+    "eslint-config-loopback": "^8.0.0",
-    "fs-extra": "^7.0.1",
+    "fs-extra": "^3.0.1",
    "loopback": "^3.0.0",
-    "mocha": "^5.2.0",
+    "mocha": "^3.3.0",
-    "supertest": "^4.0.2"
+    "supertest": "^3.0.0"
-  },
+  }
  "author": "IBM Corp."
 }
--- a/test/acceptance.test.js
+++ b/test/acceptance.test.js
@ -1,40 +0,0 @@
 // Copyright IBM Corp. 2019. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
 const path = require('path');
 const loopback = require('loopback');
 const chai = require('chai');
 const dirtyChai = require('dirty-chai');
 const expect = chai.expect;
 chai.use(dirtyChai);
 const bootLoopBackApp = require('..');
 describe('bootLoopBackApp', function() {
  let app;
  beforeEach(function() {
    app = loopback();
  });
  it('sets app.booting immediately', function() {
    const appDir = path.join(__dirname, './fixtures/empty-app');
    // Start the bootstrapper
    const promise = bootLoopBackApp(app, appDir);
    // Still in the original turn of the event loop,
    // verify that the app is signalling "boot in progress"
    expect(app.booting).to.equal(true);
    // Wait for bootstrapper to finish
    return promise.then(() => {
      // Verify that app is signalling "boot has finished"
      expect(app.booting).to.equal(false);
    });
  });
 });
--- a/test/bootstrapper.test.js
+++ b/test/bootstrapper.test.js
@ -1,43 +1,38 @@
 // Copyright IBM Corp. 2016,2019. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const path = require('path');
+var path = require('path');
-const loopback = require('loopback');
+var loopback = require('loopback');
-const chai = require('chai');
+var chai = require('chai');
-const dirtyChai = require('dirty-chai');
+var dirtyChai = require('dirty-chai');
-const expect = chai.expect;
+var expect = chai.expect;
 chai.use(dirtyChai);
-const Bootstrapper = require('../lib/bootstrapper');
+var Bootstrapper = require('../lib/bootstrapper');
 describe('Bootstrapper', function() {
-  let app;
+  var app;
  beforeEach(function() {
    app = loopback();
    process.bootFlags = [];
  });
  it('should honor options.phases', function(done) {
-    const options = {
+    var options = {
      app: app,
      appRootDir: path.join(__dirname, './fixtures/simple-app'),
      phases: ['load'],
    };
-    const bootstrapper = new Bootstrapper(options);
+    var bootstrapper = new Bootstrapper(options);
-    const context = {
+    var context = {
      app: app,
    };
    bootstrapper.run(context, function(err) {
      if (err) return done(err);
-      const configs = context.configurations;
+      var configs = context.configurations;
      expect(configs.application, 'application').to.be.an('object');
      expect(configs.bootScripts, 'bootScripts').to.be.an('array');
      expect(configs.middleware, 'middleware').to.be.an('object');
@ -50,22 +45,22 @@ describe('Bootstrapper', function() {
  });
  it('should honor options.plugins', function(done) {
-    const options = {
+    var options = {
      app: app,
      appRootDir: path.join(__dirname, './fixtures/simple-app'),
      plugins: ['application', 'boot-script'],
    };
-    const bootstrapper = new Bootstrapper(options);
+    var bootstrapper = new Bootstrapper(options);
-    const context = {
+    var context = {
      app: app,
    };
    bootstrapper.run(context, function(err) {
      if (err) return done(err);
-      const configs = context.configurations;
+      var configs = context.configurations;
-      const instructions = context.instructions;
+      var instructions = context.instructions;
      expect(configs.application, 'application').to.be.an('object');
      expect(configs.middleware, 'middleware').to.be.undefined();
      expect(configs.models, 'models').to.be.undefined();
@ -73,48 +68,40 @@ describe('Bootstrapper', function() {
      expect(instructions.application, 'application').to.be.an('object');
      expect(instructions.tracker, 'instruction: tracker').to.eql('compile');
      expect(context.executions.tracker, 'execution: tracker').to.eql('start');
-      expect(process.bootFlags, 'process: bootFlags').to.eql([
+      expect(process.bootFlags, 'process: bootFlags').to.eql(['barLoaded',
        'barLoaded',
        'barSyncLoaded',
        'fooLoaded',
        'promiseLoaded',
        'thenableLoaded',
        'barStarted',
        'barFinished',
        'barSyncExecuted',
        'promiseStarted',
        'promiseFinished',
        'thenableStarted',
        'thenableFinished',
        'umdLoaded',
      ]);
      done();
    });
  });
  it('searches boot file extensions specified in options.scriptExtensions',
-    function(done) {
+  function(done) {
-      const options = {
+    var options = {
-        app: app,
+      app: app,
-        appRootDir: path.join(__dirname, './fixtures/simple-app'),
+      appRootDir: path.join(__dirname, './fixtures/simple-app'),
-        scriptExtensions: ['.customjs', '.customjs2'],
+      scriptExtensions: ['.customjs', '.customjs2'],
-      };
+    };
-      const bootstrapper = new Bootstrapper(options);
+    var bootstrapper = new Bootstrapper(options);
-      const context = {
+    var context = {
-        app: app,
+      app: app,
-      };
+    };
-      bootstrapper.run(context, function(err) {
+    bootstrapper.run(context, function(err) {
-        if (err) return done(err);
+      if (err) return done(err);
-        expect(process.bootFlags, 'process: bootFlags').to.eql([
+      expect(process.bootFlags, 'process: bootFlags').to.eql([
-          'customjs',
+        'customjs',
-          'customjs2',
+        'customjs2',
-        ]);
+      ]);
-        done();
+      done();
      });
    });
  });
  afterEach(function() {
    delete process.bootFlags;
--- a/test/browser.multiapp.test.js
+++ b/test/browser.multiapp.test.js
@ -1,22 +1,21 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const boot = require('../');
+var boot = require('../');
-const async = require('async');
+var async = require('async');
-const exportBrowserifyToFile = require('./helpers/browserify').exportToSandbox;
+var exportBrowserifyToFile = require('./helpers/browserify').exportToSandbox;
-const packageFilter = require('./helpers/browserify').packageFilter;
+var fs = require('fs');
-const fs = require('fs');
+var path = require('path');
-const path = require('path');
+var expect = require('chai').expect;
-const expect = require('chai').expect;
+var browserify = require('browserify');
-const browserify = require('browserify');
+var sandbox = require('./helpers/sandbox');
-const sandbox = require('./helpers/sandbox');
+var vm = require('vm');
-const vm = require('vm');
+var createBrowserLikeContext = require('./helpers/browser').createContext;
-const createBrowserLikeContext = require('./helpers/browser').createContext;
+var printContextLogs = require('./helpers/browser').printContextLogs;
 const printContextLogs = require('./helpers/browser').printContextLogs;
 describe('browser support for multiple apps', function() {
  this.timeout(60000); // 60s to give browserify enough time to finish
@ -24,10 +23,10 @@ describe('browser support for multiple apps', function() {
  beforeEach(sandbox.reset);
  it('has API for bundling and booting multiple apps', function(done) {
-    const app1Dir = path.resolve(__dirname, './fixtures/browser-app');
+    var app1Dir = path.resolve(__dirname, './fixtures/browser-app');
-    const app2Dir = path.resolve(__dirname, './fixtures/browser-app-2');
+    var app2Dir = path.resolve(__dirname, './fixtures/browser-app-2');
-    const apps = [
+    var apps = [
      {
        appDir: app1Dir,
        appFile: './app.js',
@ -44,9 +43,9 @@ describe('browser support for multiple apps', function() {
    browserifyTestApps(apps, function(err, bundlePath) {
      if (err) return done(err);
-      const bundledApps = executeBundledApps(bundlePath, apps, function(err) {
+      var bundledApps = executeBundledApps(bundlePath, apps, function(err) {
-        const app1 = bundledApps.defaultApp;
+        var app1 = bundledApps.defaultApp;
-        const app2 = bundledApps.browserApp2;
+        var app2 = bundledApps.browserApp2;
        expect(app1.settings).to.have.property('custom-key', 'custom-value');
        expect(Object.keys(app1.models)).to.include('Customer');
@ -64,23 +63,22 @@ describe('browser support for multiple apps', function() {
 });
 function browserifyTestApps(apps, next) {
-  const b = browserify({
+  var b = browserify({
    debug: true,
    basedir: path.resolve(__dirname, './fixtures'),
    packageFilter,
  });
-  const bundles = [];
+  var bundles = [];
-  for (const i in apps) {
+  for (var i in apps) {
-    const appDir = apps[i].appDir;
+    var appDir = apps[i].appDir;
-    let appFile = apps[i].appFile;
+    var appFile = apps[i].appFile;
-    const moduleName = apps[i].moduleName;
+    var moduleName = apps[i].moduleName;
-    const appId = apps[i].appId;
+    var appId = apps[i].appId;
    appFile = path.join(appDir, appFile);
    b.require(appFile, {expose: moduleName});
-    let opts = appDir;
+    var opts = appDir;
    if (appId) {
      opts = {
        appId: appId,
@ -97,21 +95,21 @@ function browserifyTestApps(apps, next) {
 }
 function executeBundledApps(bundlePath, apps, done) {
-  const code = fs.readFileSync(bundlePath);
+  var code = fs.readFileSync(bundlePath);
-  const context = createBrowserLikeContext();
+  var context = createBrowserLikeContext();
  vm.runInContext(code, context, bundlePath);
-  const ids = [];
+  var ids = [];
-  let script = 'var apps = {};\n';
+  var script = 'var apps = {};\n';
-  for (const i in apps) {
+  for (var i in apps) {
-    const moduleName = apps[i].moduleName;
+    var moduleName = apps[i].moduleName;
-    const id = apps[i].appId || 'defaultApp';
+    var id = apps[i].appId || 'defaultApp';
    ids.push(id);
    script += 'apps.' + id + ' = require("' + moduleName + '");\n';
  }
  script += 'apps;\n';
-  const appsInContext = vm.runInContext(script, context);
+  var appsInContext = vm.runInContext(script, context);
  async.each(ids, function(id, done) {
    appsInContext[id].once('booted', function() {
      done();
--- a/test/browser.test.js
+++ b/test/browser.test.js
@ -1,39 +1,36 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const boot = require('../');
+var boot = require('../');
-const exportBrowserifyToFile = require('./helpers/browserify').exportToSandbox;
+var exportBrowserifyToFile = require('./helpers/browserify').exportToSandbox;
-const packageFilter = require('./helpers/browserify').packageFilter;
+var fs = require('fs');
-const fs = require('fs');
+var path = require('path');
-const path = require('path');
+var expect = require('chai').expect;
-const expect = require('chai').expect;
+var browserify = require('browserify');
-const browserify = require('browserify');
+var sandbox = require('./helpers/sandbox');
-const sandbox = require('./helpers/sandbox');
+var vm = require('vm');
-const vm = require('vm');
+var createBrowserLikeContext = require('./helpers/browser').createContext;
-const createBrowserLikeContext = require('./helpers/browser').createContext;
+var printContextLogs = require('./helpers/browser').printContextLogs;
 const printContextLogs = require('./helpers/browser').printContextLogs;
-const compileStrategies = {
+var compileStrategies = {
-  default: function(appDir) {
+  'default': function(appDir) {
-    const b = browserify({
+    var b = browserify({
      basedir: appDir,
      debug: true,
      packageFilter,
    });
    b.require('./app.js', {expose: 'browser-app'});
    return b;
  },
-  coffee: function(appDir) {
+  'coffee': function(appDir) {
-    const b = browserify({
+    var b = browserify({
      basedir: appDir,
      extensions: ['.coffee'],
      debug: true,
      packageFilter,
    });
    b.transform('coffeeify');
@ -48,20 +45,18 @@ describe('browser support', function() {
  beforeEach(sandbox.reset);
  it('has API for bundling and executing boot instructions', function(done) {
-    const appDir = path.resolve(__dirname, './fixtures/browser-app');
+    var appDir = path.resolve(__dirname, './fixtures/browser-app');
    browserifyTestApp(appDir, function(err, bundlePath) {
      if (err) return done(err);
-      const app = executeBundledApp(bundlePath, function(err) {
+      var app = executeBundledApp(bundlePath, function(err) {
        if (err) return done(err);
        // configured in fixtures/browser-app/boot/configure.js
        expect(app.settings).to.have.property('custom-key', 'custom-value');
        expect(Object.keys(app.models)).to.include('Customer');
-        expect(app.models.Customer.settings).to.have.property(
+        expect(app.models.Customer.settings)
-          '_customized',
+          .to.have.property('_customized', 'Customer');
          'Customer',
        );
        // configured in fixtures/browser-app/component-config.json
        // and fixtures/browser-app/components/dummy-component.js
@ -72,17 +67,17 @@ describe('browser support', function() {
  });
  it('loads mixins', function(done) {
-    const appDir = path.resolve(__dirname, './fixtures/browser-app');
+    var appDir = path.resolve(__dirname, './fixtures/browser-app');
-    const options = {
+    var options = {
      appRootDir: appDir,
    };
    browserifyTestApp(options, function(err, bundlePath) {
      if (err) return done(err);
-      const app = executeBundledApp(bundlePath, function(err) {
+      var app = executeBundledApp(bundlePath, function(err) {
-        const modelBuilder = app.registry.modelBuilder;
+        var modelBuilder = app.registry.modelBuilder;
-        const registry = modelBuilder.mixins.mixins;
+        var registry = modelBuilder.mixins.mixins;
        expect(Object.keys(registry)).to.eql(['TimeStamps']);
        expect(app.models.Customer.timeStampsMixin).to.eql(true);
@ -93,21 +88,19 @@ describe('browser support', function() {
  it('supports coffee-script files', function(done) {
    // add coffee-script to require.extensions
-    require('coffeescript/register');
+    require('coffee-script/register');
-    const appDir = path.resolve(__dirname, './fixtures/coffee-app');
+    var appDir = path.resolve(__dirname, './fixtures/coffee-app');
    browserifyTestApp(appDir, 'coffee', function(err, bundlePath) {
      if (err) return done(err);
-      const app = executeBundledApp(bundlePath, function(err) {
+      var app = executeBundledApp(bundlePath, function(err) {
        // configured in fixtures/browser-app/boot/configure.coffee
        expect(app.settings).to.have.property('custom-key', 'custom-value');
        expect(Object.keys(app.models)).to.include('Customer');
-        expect(app.models.Customer.settings).to.have.property(
+        expect(app.models.Customer.settings)
-          '_customized',
+          .to.have.property('_customized', 'Customer');
          'Customer',
        );
        done();
      });
    });
@ -116,14 +109,15 @@ describe('browser support', function() {
 function browserifyTestApp(options, strategy, next) {
  // set default args
-  if (typeof strategy === 'function' && !next) {
+  if (((typeof strategy) === 'function') && !next) {
    next = strategy;
    strategy = undefined;
  }
-  if (!strategy) strategy = 'default';
+  if (!strategy)
    strategy = 'default';
-  const appDir = typeof options === 'object' ? options.appRootDir : options;
+  var appDir = typeof(options) === 'object' ? options.appRootDir : options;
-  const b = compileStrategies[strategy](appDir);
+  var b = compileStrategies[strategy](appDir);
  boot.compileToBrowserify(options, b, function(err) {
    exportBrowserifyToFile(b, 'browser-app-bundle.js', next);
@ -131,10 +125,10 @@ function browserifyTestApp(options, strategy, next) {
 }
 function executeBundledApp(bundlePath, done) {
-  const code = fs.readFileSync(bundlePath);
+  var code = fs.readFileSync(bundlePath);
-  const context = createBrowserLikeContext();
+  var context = createBrowserLikeContext();
  vm.runInContext(code, context, bundlePath);
-  const app = vm.runInContext('require("browser-app")', context);
+  var app = vm.runInContext('require("browser-app")', context);
  app.once('booted', function(err) {
    printContextLogs(context);
    done(err, app);
--- a/test/compiler.test.js
+++ b/test/compiler.test.js
--- a/test/executor.test.js
+++ b/test/executor.test.js
@ -1,31 +1,31 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const async = require('async');
+var async = require('async');
-const boot = require('../');
+var boot = require('../');
-const path = require('path');
+var path = require('path');
-const loopback = require('loopback');
+var loopback = require('loopback');
-const assert = require('assert');
+var assert = require('assert');
-const chai = require('chai');
+var chai = require('chai');
-const dirtyChai = require('dirty-chai');
+var dirtyChai = require('dirty-chai');
-const expect = chai.expect;
+var expect = chai.expect;
 chai.use(dirtyChai);
-const fs = require('fs-extra');
+var fs = require('fs-extra');
-const sandbox = require('./helpers/sandbox');
+var sandbox = require('./helpers/sandbox');
-const appdir = require('./helpers/appdir');
+var appdir = require('./helpers/appdir');
-const supertest = require('supertest');
+var supertest = require('supertest');
-const os = require('os');
+var os = require('os');
-const SIMPLE_APP = path.join(__dirname, 'fixtures', 'simple-app');
+var SIMPLE_APP = path.join(__dirname, 'fixtures', 'simple-app');
-const ENV_APP = path.join(__dirname, 'fixtures', 'env-app');
+var ENV_APP = path.join(__dirname, 'fixtures', 'env-app');
-let app;
+var app;
 describe('executor', function() {
  beforeEach(sandbox.reset);
@ -43,7 +43,7 @@ describe('executor', function() {
    delete process.bootFlags;
  });
-  const dummyInstructions = someInstructions({
+  var dummyInstructions = someInstructions({
    application: {
      port: 0,
      host: '127.0.0.1',
@ -134,7 +134,7 @@ describe('executor', function() {
      expect(app.models.Customer).to.exist();
      expect(app.models.Customer.settings._customized).to.be.equal('Customer');
-      const UserModel = app.registry.getModel('User');
+      var UserModel = app.registry.getModel('User');
      expect(UserModel.settings._customized).to.equal('Base');
      done();
    });
@ -232,7 +232,7 @@ describe('executor', function() {
  });
  it('throws on bad require() call inside boot script', function(done) {
-    const file = appdir.writeFileSync('boot/badScript.js',
+    var file = appdir.writeFileSync('boot/badScript.js',
      'require("doesnt-exist"); module.exports = {};');
    boot.execute(app, someInstructions({bootScripts: [file]}),
@ -261,7 +261,7 @@ describe('executor', function() {
      // loopback-datasource-juggler quirk:
      // Model.dataSources has modelBuilder as the default value,
      // therefore it's not enough to assert a false-y value
-      const actual = loopback.Email.dataSource instanceof loopback.DataSource ?
+      var actual = loopback.Email.dataSource instanceof loopback.DataSource ?
        'attached' : 'not attached';
      expect(actual).to.equal('not attached');
      done();
@ -269,10 +269,10 @@ describe('executor', function() {
  });
  it('skips definition of already defined LoopBack models', function(done) {
-    const builtinModel = {
+    var builtinModel = {
      name: 'User',
      definition: fs.readJsonSync(
-        require.resolve('loopback/common/models/user.json'),
+        require.resolve('loopback/common/models/user.json')
      ),
      config: {dataSource: 'db'},
      sourceFile: require.resolve('loopback/common/models/user.js'),
@ -306,16 +306,9 @@ describe('executor', function() {
        'barLoaded',
        'barSyncLoaded',
        'fooLoaded',
        'promiseLoaded',
        'thenableLoaded',
        'barStarted',
        'barFinished',
        'barSyncExecuted',
        'promiseStarted',
        'promiseFinished',
        'thenableStarted',
        'thenableFinished',
        'umdLoaded',
      ]);
    });
  });
@ -329,132 +322,60 @@ describe('executor', function() {
            'barLoaded',
            'barSyncLoaded',
            'fooLoaded',
            'promiseLoaded',
            'thenableLoaded',
            'barStarted',
            'barFinished',
            'barSyncExecuted',
            'promiseStarted',
            'promiseFinished',
            'thenableStarted',
            'thenableFinished',
            'umdLoaded',
          ]);
          done();
        });
      });
    });
  });
-  describe('with boot script returning a rejected promise', function() {
+    describe('for mixins', function() {
-    before(function() {
+      var options;
-      // Tell simple-app/boot/reject.js to return a rejected promise
+      beforeEach(function() {
-      process.rejectPromise = true;
+        appdir.writeFileSync('custom-mixins/example.js',
-    });
+          'module.exports = ' +
          'function(Model, options) {}');
-    after(function() {
+        appdir.writeFileSync('custom-mixins/time-stamps.js',
-      delete process.rejectPromise;
+          'module.exports = ' +
-    });
+          'function(Model, options) {}');
-    it('receives rejected promise as callback error',
+        appdir.writeConfigFileSync('custom-mixins/time-stamps.json', {
-      function(done) {
+          name: 'Timestamping',
-        simpleAppInstructions(function(err, context) {
+        });
-          if (err) return done(err);
+
-          boot.execute(app, context.instructions, function(err) {
+        options = {
-            expect(err).to.exist.and.be.an.instanceOf(Error)
+          appRootDir: appdir.PATH,
-              .with.property('message', 'reject');
+        };
      });
      it('defines mixins from instructions - using `mixinDirs`',
        function(done) {
          options.mixinDirs = ['./custom-mixins'];
          boot(app, options, function(err) {
            if (err) return done(err);
            var modelBuilder = app.registry.modelBuilder;
            var registry = modelBuilder.mixins.mixins;
            expect(Object.keys(registry)).to.eql(['Example', 'Timestamping']);
            done();
          });
        });
      });
  });
-  describe('with boot script throwing an error', function() {
+      it('defines mixins from instructions - using `mixinSources`',
-    before(function() {
+        function(done) {
-      // Tell simple-app/boot/throw.js to throw an error
+          options.mixinSources = ['./custom-mixins'];
-      process.throwError = true;
+          boot(app, options, function(err) {
-    });
+            if (err) return done(err);
-    after(function() {
+            var modelBuilder = app.registry.modelBuilder;
-      delete process.throwError;
+            var registry = modelBuilder.mixins.mixins;
-    });
+            expect(Object.keys(registry)).to.eql(['Example', 'Timestamping']);
    it('receives thrown error as callback errors',
      function(done) {
        simpleAppInstructions(function(err, context) {
          if (err) return done(err);
          boot.execute(app, context.instructions, function(err) {
            expect(err).to.exist.and.be.an.instanceOf(Error)
              .with.property('message', 'throw');
            done();
          });
        });
      });
  });
  describe('with boot script returning a promise and calling callback',
    function() {
      before(function() {
        process.promiseAndCallback = true;
      });
      after(function() {
        delete process.promiseAndCallback;
      });
      it('should only call the callback once', function(done) {
        simpleAppInstructions(function(err, context) {
          if (err) return done(err);
          // Note: Mocha will fail this test if done() is called twice
          boot.execute(app, context.instructions, done);
        });
      });
    });
  describe('for mixins', function() {
    let options;
    beforeEach(function() {
      appdir.writeFileSync('custom-mixins/example.js',
        'module.exports = ' +
        'function(Model, options) {}');
      appdir.writeFileSync('custom-mixins/time-stamps.js',
        'module.exports = ' +
        'function(Model, options) {}');
      appdir.writeConfigFileSync('custom-mixins/time-stamps.json', {
        name: 'Timestamping',
      });
      options = {
        appRootDir: appdir.PATH,
      };
    });
    it('defines mixins from instructions - using `mixinDirs`',
      function(done) {
        options.mixinDirs = ['./custom-mixins'];
        boot(app, options, function(err) {
          if (err) return done(err);
          const modelBuilder = app.registry.modelBuilder;
          const registry = modelBuilder.mixins.mixins;
          expect(Object.keys(registry)).to.eql(['Example', 'Timestamping']);
          done();
        });
      });
    it('defines mixins from instructions - using `mixinSources`',
      function(done) {
        options.mixinSources = ['./custom-mixins'];
        boot(app, options, function(err) {
          if (err) return done(err);
          const modelBuilder = app.registry.modelBuilder;
          const registry = modelBuilder.mixins.mixins;
          expect(Object.keys(registry)).to.eql(['Example', 'Timestamping']);
          done();
        });
      });
  });
  describe('with PaaS and npm env variables', function() {
@ -581,7 +502,7 @@ describe('executor', function() {
    });
    it('should respect named pipes port values in ENV', function(done) {
-      const NAMED_PORT = '\\.\\pipe\\test';
+      var NAMED_PORT = '\\.\\pipe\\test';
      process.env.PORT = NAMED_PORT;
      boot.execute(app, someInstructions({application: {port: 3000}}),
        function(err) {
@ -599,7 +520,8 @@ describe('executor', function() {
    it('should parse a simple config variable', function(done) {
      boot.execute(app, simpleMiddlewareConfig('routes',
-        {path: '${restApiRoot}'}), function(err) {
+        {path: '${restApiRoot}'}
      ), function(err) {
        if (err) return done(err);
        supertest(app).get('/').end(function(err, res) {
@ -613,7 +535,8 @@ describe('executor', function() {
    it('should parse simple config variable from env var', function(done) {
      process.env.restApiRoot = '/url-from-env-var';
      boot.execute(app, simpleMiddlewareConfig('routes',
-        {path: '${restApiRoot}'}), function(err) {
+        {path: '${restApiRoot}'}
      ), function(err) {
        if (err) return done(err);
        supertest(app).get('/url-from-env-var').end(function(err, res) {
@ -627,7 +550,8 @@ describe('executor', function() {
    it('dynamic variable from `env var` should have' +
      ' precedence over app.get()', function(done) {
      process.env.restApiRoot = '/url-from-env-var';
-      const bootInstructions = simpleMiddlewareConfig('routes',
+      var bootInstructions;
      bootInstructions = simpleMiddlewareConfig('routes',
        {path: '${restApiRoot}'});
      bootInstructions.application = {restApiRoot: '/url-from-config'};
      boot.execute(app, someInstructions(bootInstructions), function(err) {
@ -644,7 +568,8 @@ describe('executor', function() {
    it('should parse multiple config variables', function(done) {
      boot.execute(app, simpleMiddlewareConfig('routes',
-        {path: '${restApiRoot}', env: '${env}'}), function(err) {
+        {path: '${restApiRoot}', env: '${env}'}
      ), function(err) {
        if (err) return done(err);
        supertest(app).get('/').end(function(err, res) {
@ -658,13 +583,14 @@ describe('executor', function() {
    it('should parse config variables in an array', function(done) {
      boot.execute(app, simpleMiddlewareConfig('routes',
-        {paths: ['${restApiRoot}']}), function(err) {
+        {paths: ['${restApiRoot}']}
      ), function(err) {
        if (err) return done(err);
        supertest(app).get('/').end(function(err, res) {
          if (err) return done(err);
          expect(res.body.paths).to.eql(
-            [app.get('restApiRoot')],
+            [app.get('restApiRoot')]
          );
          done();
        });
@ -673,7 +599,8 @@ describe('executor', function() {
    it('should parse config variables in an object', function(done) {
      boot.execute(app, simpleMiddlewareConfig('routes',
-        {info: {path: '${restApiRoot}'}}), function(err) {
+        {info: {path: '${restApiRoot}'}}
      ), function(err) {
        if (err) return done(err);
        supertest(app).get('/').end(function(err, res) {
@ -688,7 +615,8 @@ describe('executor', function() {
    it('should parse config variables in a nested object', function(done) {
      boot.execute(app, simpleMiddlewareConfig('routes',
-        {nested: {info: {path: '${restApiRoot}'}}}), function(err) {
+        {nested: {info: {path: '${restApiRoot}'}}}
      ), function(err) {
        if (err) return done(err);
        supertest(app).get('/').end(function(err, res) {
@ -703,7 +631,8 @@ describe('executor', function() {
    it('should parse config variables with null values', function(done) {
      boot.execute(app, simpleMiddlewareConfig('routes',
-        {nested: {info: {path: '${restApiRoot}', some: null}}}), function(err) {
+        {nested: {info: {path: '${restApiRoot}', some: null}}}
      ), function(err) {
        if (err) return done(err);
        supertest(app).get('/').end(function(err, res) {
@ -720,10 +649,10 @@ describe('executor', function() {
    });
    it('should not parse invalid config variables', function(done) {
-      const invalidDataTypes = [undefined, function() {
+      var invalidDataTypes = [undefined, function() {
      }];
      async.each(invalidDataTypes, function(invalidDataType, cb) {
-        const config = simpleMiddlewareConfig('routes', {
+        var config = simpleMiddlewareConfig('routes', {
          path: invalidDataType,
        });
        boot.execute(app, config, function(err) {
@ -741,7 +670,7 @@ describe('executor', function() {
    });
    it('should parse valid config variables', function(done) {
-      const config = simpleMiddlewareConfig('routes', {
+      var config = simpleMiddlewareConfig('routes', {
        props: ['a', '${vVar}', 1, true, function() {
        }, {x: 1, y: '${y}'}],
      });
@ -758,12 +687,11 @@ describe('executor', function() {
    });
    it('should preserve object prototypes', function(done) {
-      const config = simpleMiddlewareConfig(
+      var config = simpleMiddlewareConfig(
        'routes',
        // IMPORTANT we need more than one item to trigger the original issue
        [/^\/foobar/, /^\/another/],
-        {},
+        {});
      );
      boot.execute(app, config, function(err) {
        if (err) return done(err);
@ -782,7 +710,7 @@ describe('executor', function() {
    it('should parse a simple config variable', function(done) {
      boot.execute(app, simpleComponentConfig(
-        {path: '${restApiRoot}'},
+        {path: '${restApiRoot}'}
      ), function(err) {
        if (err) return done(err);
@ -795,12 +723,12 @@ describe('executor', function() {
    });
    it('should parse config from `env-var` and `config`', function(done) {
-      const bootInstructions = simpleComponentConfig(
+      var bootInstructions = simpleComponentConfig(
        {
          path: '${restApiRoot}',
          fromConfig: '${DYNAMIC_CONFIG}',
          fromEnvVar: '${DYNAMIC_ENVVAR}',
-        },
+        }
      );
      // result should get value from config.json
@ -820,8 +748,8 @@ describe('executor', function() {
    });
    it('`env-var` should have precedence over `config`', function(done) {
-      const key = 'DYNAMIC_VARIABLE';
+      var key = 'DYNAMIC_VARIABLE';
-      const bootInstructions = simpleComponentConfig({
+      var bootInstructions = simpleComponentConfig({
        path: '${restApiRoot}',
        isDynamic: '${' + key + '}',
      });
@ -840,7 +768,7 @@ describe('executor', function() {
    it('should parse multiple config variables', function(done) {
      boot.execute(app, simpleComponentConfig(
-        {path: '${restApiRoot}', env: '${env}'},
+        {path: '${restApiRoot}', env: '${env}'}
      ), function(err) {
        if (err) return done(err);
@ -855,14 +783,14 @@ describe('executor', function() {
    it('should parse config variables in an array', function(done) {
      boot.execute(app, simpleComponentConfig(
-        {paths: ['${restApiRoot}']},
+        {paths: ['${restApiRoot}']}
      ), function(err) {
        if (err) return done(err);
        supertest(app).get('/component').end(function(err, res) {
          if (err) return done(err);
          expect(res.body.paths).to.eql(
-            [app.get('restApiRoot')],
+            [app.get('restApiRoot')]
          );
          done();
        });
@ -871,7 +799,7 @@ describe('executor', function() {
    it('should parse config variables in an object', function(done) {
      boot.execute(app, simpleComponentConfig(
-        {info: {path: '${restApiRoot}'}},
+        {info: {path: '${restApiRoot}'}}
      ), function(err) {
        if (err) return done(err);
@ -887,7 +815,7 @@ describe('executor', function() {
    it('should parse config variables in a nested object', function(done) {
      boot.execute(app, simpleComponentConfig(
-        {nested: {info: {path: '${restApiRoot}'}}},
+        {nested: {info: {path: '${restApiRoot}'}}}
      ), function(err) {
        if (err) return done(err);
@ -903,7 +831,7 @@ describe('executor', function() {
  });
  it('calls function exported by boot/init.js', function(done) {
-    const file = appdir.writeFileSync('boot/init.js',
+    var file = appdir.writeFileSync('boot/init.js',
      'module.exports = function(app) { app.fnCalled = true; };');
    delete app.fnCalled;
@ -916,7 +844,7 @@ describe('executor', function() {
  });
  it('configures middleware', function(done) {
-    const pushNamePath = require.resolve('./helpers/push-name-middleware');
+    var pushNamePath = require.resolve('./helpers/push-name-middleware');
    boot.execute(app, someInstructions({
      middleware: {
@ -960,7 +888,7 @@ describe('executor', function() {
        .get('/')
        .end(function(err, res) {
          if (err) return done(err);
-          const names = (res.headers.names || '').split(',');
+          var names = (res.headers.names || '').split(',');
          expect(names).to.eql(['initial', 'custom', 'routes']);
          done();
        });
@ -988,7 +916,7 @@ describe('executor', function() {
        .get('/')
        .end(function(err, res) {
          if (err) return done(err);
-          const EXPECTED_TEXT = '<!DOCTYPE html>\n<html>\n<head lang="en">\n' +
+          var EXPECTED_TEXT = '<!DOCTYPE html>\n<html>\n<head lang="en">\n' +
            '    <meta charset="UTF-8">\n    <title>simple-app</title>\n' +
            '</head>\n<body>\n<h1>simple-app</h1>\n' +
            '</body>\n</html>';
@ -1030,8 +958,7 @@ describe('executor', function() {
      if (err) return done(err);
      expect(Object.keys(require.cache)).to.include(
-        appdir.resolve('components/test-component/index.js'),
+        appdir.resolve('components/test-component/index.js'));
      );
      expect(app.componentOptions).to.eql({option: 'value'});
      done();
@ -1051,37 +978,35 @@ describe('executor', function() {
      if (err) return done(err);
      expect(Object.keys(require.cache)).to.not.include(
-        appdir.resolve('components/test-component/index.js'),
+        appdir.resolve('components/test-component/index.js'));
      );
      done();
    });
  });
  it('disables component if overrided by production configuration',
-    function(done) {
+  function(done) {
-      appdir.writeConfigFileSync('component-config.json', {
+    appdir.writeConfigFileSync('component-config.json', {
-        './components/test-component': {},
+      './components/test-component': {},
-      });
+    });
-      appdir.writeConfigFileSync('component-config.production.json', {
+    appdir.writeConfigFileSync('component-config.production.json', {
-        './components/test-component': null,
+      './components/test-component': null,
      });
      appdir.writeFileSync('components/test-component/index.js',
        'module.exports = ' +
      'function(app, options) { app.componentOptions = options; }');
      boot(app, {appRootDir: appdir.PATH, env: 'production'}, function(err) {
        if (err) return done(err);
        expect(Object.keys(require.cache)).to.not.include(
          appdir.resolve('components/test-component/index.js'),
        );
        done();
      });
    });
    appdir.writeFileSync('components/test-component/index.js',
      'module.exports = ' +
      'function(app, options) { app.componentOptions = options; }');
    boot(app, {appRootDir: appdir.PATH, env: 'production'}, function(err) {
      if (err) return done(err);
      expect(Object.keys(require.cache)).to.not.include(
        appdir.resolve('components/test-component/index.js'));
      done();
    });
  });
  it('configures middleware (that requires `this`)', function(done) {
-    const passportPath = require.resolve('./fixtures/passport');
+    var passportPath = require.resolve('./fixtures/passport');
    boot.execute(app, someInstructions({
      middleware: {
@ -1121,7 +1046,7 @@ describe('executor', function() {
  });
  describe('when booting with lazy connect', function() {
-    const SAMPLE_INSTRUCTION = someInstructions({
+    var SAMPLE_INSTRUCTION = someInstructions({
      dataSources: {
        lazyConnector: {
          connector: 'testLazyConnect',
@ -1129,7 +1054,7 @@ describe('executor', function() {
        },
      },
    });
-    let connectTriggered = true;
+    var connectTriggered = true;
    beforeEach(function() {
      app.connector('testLazyConnect', {
@ -1183,14 +1108,13 @@ describe('executor', function() {
    });
    it('should convert dynamic variable for datasource', function(done) {
-      const datasource = {
+      var datasource = {
        mydb: {
          connector: 'memory',
          host: '${DYNAMIC_HOST}',
          port: '${DYNAMIC_PORT}',
        },
      };
-      const bootInstructions = {dataSources: datasource};
+      var bootInstructions = {dataSources: datasource};
      process.env.DYNAMIC_PORT = '10007';
      process.env.DYNAMIC_HOST = '123.321.123.132';
@ -1203,34 +1127,27 @@ describe('executor', function() {
    });
    it('should resolve dynamic config via app.get()', function(done) {
-      const datasource = {
+      var datasource = {
-        mydb: {
+        mydb: {host: '${DYNAMIC_HOST}'},
          connector: 'memory',
          host: '${DYNAMIC_HOST}',
        },
      };
-      const bootInstructions = {
+      var bootInstructions = {
        application: {DYNAMIC_HOST: '127.0.0.4'},
        dataSources: datasource,
      };
      boot.execute(app, someInstructions(bootInstructions), function() {
        expect(app.get('DYNAMIC_HOST')).to.equal('127.0.0.4');
        expect(app.datasources.mydb.settings.host).to.equal(
-          '127.0.0.4',
+          '127.0.0.4');
        );
        done();
      });
    });
    it('should take ENV precedence over config.json', function(done) {
      process.env.DYNAMIC_HOST = '127.0.0.2';
-      const datasource = {
+      var datasource = {
-        mydb: {
+        mydb: {host: '${DYNAMIC_HOST}'},
          connector: 'memory',
          host: '${DYNAMIC_HOST}',
        },
      };
-      const bootInstructions = {
+      var bootInstructions = {
        application: {DYNAMIC_HOST: '127.0.0.3'},
        dataSources: datasource,
      };
@ -1242,13 +1159,10 @@ describe('executor', function() {
    });
    it('empty dynamic conf should resolve as `undefined`', function(done) {
-      const datasource = {
+      var datasource = {
-        mydb: {
+        mydb: {host: '${DYNAMIC_HOST}'},
          connector: 'memory',
          host: '${DYNAMIC_HOST}',
        },
      };
-      const bootInstructions = {dataSources: datasource};
+      var bootInstructions = {dataSources: datasource};
      boot.execute(app, someInstructions(bootInstructions), function() {
        expect(app.get('DYNAMIC_HOST')).to.be.undefined();
@ -1265,7 +1179,7 @@ function simpleMiddlewareConfig(phase, paths, params) {
    paths = undefined;
  }
-  const config = {
+  var config = {
    phase: phase,
    params: params,
  };
@ -1314,7 +1228,7 @@ assert.isFunc = function(obj, name) {
 };
 function someInstructions(values) {
-  const result = {
+  var result = {
    application: values.application || {},
    models: values.models || [],
    dataSources: values.dataSources || {db: {connector: 'memory'}},
@ -1327,7 +1241,7 @@ function someInstructions(values) {
    result.env = values.env;
  if (values.files) {
-    for (const k in values.files)
+    for (var k in values.files)
      result.files[k] = values.files[k];
  }
--- a/test/fixtures/browser-app-2/app.js
+++ b/test/fixtures/browser-app-2/app.js
@ -1,14 +1,14 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const loopback = require('loopback');
+var loopback = require('loopback');
-const boot = require('../../../');
+var boot = require('../../../');
-const app = module.exports = loopback();
+var app = module.exports = loopback();
 boot(app, {
  appId: 'browserApp2',
  appRootDir: __dirname,
--- a/test/fixtures/browser-app-2/models/robot.js
+++ b/test/fixtures/browser-app-2/models/robot.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/browser-app/app.js
+++ b/test/fixtures/browser-app/app.js
@ -1,12 +1,12 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const loopback = require('loopback');
+var loopback = require('loopback');
-const boot = require('../../../');
+var boot = require('../../../');
-const app = module.exports = loopback();
+var app = module.exports = loopback();
 boot(app, __dirname);
--- a/test/fixtures/browser-app/boot/configure.js
+++ b/test/fixtures/browser-app/boot/configure.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/browser-app/components/dummy-component.js
+++ b/test/fixtures/browser-app/components/dummy-component.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/browser-app/mixins/time-stamps.js
+++ b/test/fixtures/browser-app/mixins/time-stamps.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/browser-app/models/customer.js
+++ b/test/fixtures/browser-app/models/customer.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/empty-app/config.json
+++ b/test/fixtures/empty-app/config.json
@ -1,2 +0,0 @@
 {
 }
--- a/test/fixtures/env-app/boot/test/bar.js
+++ b/test/fixtures/env-app/boot/test/bar.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/passport.js
+++ b/test/fixtures/passport.js
@ -1,11 +1,11 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const framework = {
+var framework = {
  initialize: function(passport) {
    return function(req, res, next) {
      req._passport = passport;
@ -15,7 +15,7 @@ const framework = {
  },
 };
-const Passport = function() {
+var Passport = function() {
  this._framework = framework;
 };
--- a/test/fixtures/simple-app/boot/bar.js
+++ b/test/fixtures/simple-app/boot/bar.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/simple-app/boot/barSync.js
+++ b/test/fixtures/simple-app/boot/barSync.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/simple-app/boot/booting.js
+++ b/test/fixtures/simple-app/boot/booting.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/simple-app/boot/foo.js
+++ b/test/fixtures/simple-app/boot/foo.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/simple-app/boot/promise-callback.js
+++ b/test/fixtures/simple-app/boot/promise-callback.js
@ -1,15 +0,0 @@
 // Copyright IBM Corp. 2017,2019. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
 const Promise = require('bluebird');
 module.exports = function(app, callback) {
  callback();
  if (process.promiseAndCallback) {
    return Promise.reject();
  }
 };
--- a/test/fixtures/simple-app/boot/promise.js
+++ b/test/fixtures/simple-app/boot/promise.js
@ -1,21 +0,0 @@
 // Copyright IBM Corp. 2017,2019. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
 const Promise = require('bluebird');
 process.bootFlags.push('promiseLoaded');
 module.exports = function(app) {
  process.bootFlags.push('promiseStarted');
  return Promise.resolve({
    then: function(onFulfill, onReject) {
      process.nextTick(function() {
        process.bootFlags.push('promiseFinished');
        onFulfill();
      });
    },
  });
 };
--- a/test/fixtures/simple-app/boot/reject.js
+++ b/test/fixtures/simple-app/boot/reject.js
@ -1,14 +0,0 @@
 // Copyright IBM Corp. 2017,2019. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
 const Promise = require('bluebird');
 module.exports = function(app) {
  if (process.rejectPromise) {
    return Promise.reject(new Error('reject'));
  }
 };
--- a/test/fixtures/simple-app/boot/thenable.js
+++ b/test/fixtures/simple-app/boot/thenable.js
@ -1,19 +0,0 @@
 // Copyright IBM Corp. 2017. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
 process.bootFlags.push('thenableLoaded');
 module.exports = function(app) {
  process.bootFlags.push('thenableStarted');
  return {
    then: function(onFulfill, onReject) {
      process.nextTick(function() {
        process.bootFlags.push('thenableFinished');
        onFulfill();
      });
    },
  };
 };
--- a/test/fixtures/simple-app/boot/throw.js
+++ b/test/fixtures/simple-app/boot/throw.js
@ -1,12 +0,0 @@
 // Copyright IBM Corp. 2017. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
 module.exports = function(app) {
  if (process.throwError) {
    throw new Error('throw');
  }
 };
--- a/test/fixtures/simple-app/boot/umd-script.js
+++ b/test/fixtures/simple-app/boot/umd-script.js
@ -1,13 +0,0 @@
 // Copyright IBM Corp. 2018,2019. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
 module.exports = {
  default: function() {
    process.bootFlags.push('umdLoaded');
  },
 };
 Object.defineProperty(module.exports, '__esModule', {value: true});
--- a/test/fixtures/simple-app/middleware/index.js
+++ b/test/fixtures/simple-app/middleware/index.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/simple-app/node_modules/my-module/index.js
+++ b/test/fixtures/simple-app/node_modules/my-module/index.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/simple-app/plugins/tracker.js
+++ b/test/fixtures/simple-app/plugins/tracker.js
@ -1,8 +1,3 @@
 // Copyright IBM Corp. 2016,2019. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
 module.exports = function(opitions) {
--- a/test/fixtures/simple-component.js
+++ b/test/fixtures/simple-component.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/fixtures/simple-middleware.js
+++ b/test/fixtures/simple-middleware.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/helpers/appdir.js
+++ b/test/helpers/appdir.js
@ -1,18 +1,18 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const path = require('path');
+var path = require('path');
-const fs = require('fs-extra');
+var fs = require('fs-extra');
-const extend = require('util')._extend;
+var extend = require('util')._extend;
-const sandbox = require('./sandbox');
+var sandbox = require('./sandbox');
-const appdir = exports;
+var appdir = exports;
-let PATH = appdir.PATH = null;
+var PATH = appdir.PATH = null;
 appdir.init = function(cb) {
  // Node's module loader has a very aggressive caching, therefore
@ -20,7 +20,7 @@ appdir.init = function(cb) {
  // The code here is used to generate a random string
  require('crypto').randomBytes(5, function(err, buf) {
    if (err) return cb(err);
-    const randomStr = buf.toString('hex');
+    var randomStr = buf.toString('hex');
    PATH = appdir.PATH = sandbox.resolve(randomStr);
    cb(null, appdir.PATH);
  });
@ -49,7 +49,7 @@ appdir.writeConfigFileSync = function(name, json) {
 };
 appdir.writeFileSync = function(name, content) {
-  const filePath = this.resolve(name);
+  var filePath = this.resolve(name);
  fs.mkdirsSync(path.dirname(filePath));
  fs.writeFileSync(filePath, content, 'utf-8');
  return filePath;
--- a/test/helpers/browser.js
+++ b/test/helpers/browser.js
@ -1,17 +1,16 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const vm = require('vm');
+var vm = require('vm');
 function createContext() {
-  const context = {
+  var context = {
    // required by browserify
-    XMLHttpRequest: function() {},
+    XMLHttpRequest: function() { throw new Error('not implemented'); },
    clearTimeout: function() {},
    FormData: function() { throw new Error('not implemented'); },
    localStorage: {
@ -33,7 +32,7 @@ function createContext() {
    DataView: DataView,
    crypto: {
      getRandomValues: function(typedArray) {
-        const randomBuffer = require('crypto').randomBytes(typedArray.length);
+        var randomBuffer = require('crypto').randomBytes(typedArray.length);
        // This implementation is not secure: we take random 8bit values
        // and assign them to 8/16/32bit values, leaving high-order bits
        // filled with zeroes.
@ -73,9 +72,9 @@ function createContext() {
 exports.createContext = createContext;
 function printContextLogs(context) {
-  let k, ix; // see https://github.com/eslint/eslint/issues/5744
+  var k, ix; // see https://github.com/eslint/eslint/issues/5744
  for (k in context.console._logs) {
-    const items = context.console._logs[k];
+    var items = context.console._logs[k];
    for (ix in items) {
      console[k].apply(console, items[ix]);
    }
--- a/test/helpers/browserify.js
+++ b/test/helpers/browserify.js
@ -1,16 +1,16 @@
-// Copyright IBM Corp. 2015,2019. All Rights Reserved.
+// Copyright IBM Corp. 2015. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const fs = require('fs');
+var fs = require('fs');
-const sandbox = require('./sandbox');
+var sandbox = require('./sandbox');
 function exportToSandbox(b, fileName, callback) {
-  const bundlePath = sandbox.resolve(fileName);
+  var bundlePath = sandbox.resolve(fileName);
-  const out = fs.createWriteStream(bundlePath);
+  var out = fs.createWriteStream(bundlePath);
  b.bundle().pipe(out);
  out.on('error', function(err) {
@ -21,16 +21,3 @@ function exportToSandbox(b, fileName, callback) {
  });
 }
 exports.exportToSandbox = exportToSandbox;
 exports.packageFilter = function packageFilter(pkg, dir) {
  // async@3 (used e.g. by loopback-connector) is specifying custom
  // browserify config, in particular it wants to apply transformation
  // `babelify`. We don't have `babelify` installed because we are
  // testing using latest Chrome and thus don't need any transpilation.
  // Let's remove the browserify config from the package and force
  // browserify to use our config instead.
  if (pkg.name === 'async') {
    delete pkg.browserify;
  }
  return pkg;
 };
--- a/test/helpers/push-name-middleware.js
+++ b/test/helpers/push-name-middleware.js
@ -1,4 +1,4 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
--- a/test/helpers/sandbox.js
+++ b/test/helpers/sandbox.js
@ -1,14 +1,14 @@
-// Copyright IBM Corp. 2014,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const fs = require('fs-extra');
+var fs = require('fs-extra');
-const path = require('path');
+var path = require('path');
-const sandbox = exports;
+var sandbox = exports;
 sandbox.PATH = path.join(__dirname, '..', 'sandbox');
 sandbox.reset = function() {
@ -17,7 +17,7 @@ sandbox.reset = function() {
 };
 sandbox.resolve = function() {
-  const args = Array.prototype.slice.apply(arguments);
+  var args = Array.prototype.slice.apply(arguments);
  args.unshift(sandbox.PATH);
  return path.resolve.apply(path.resolve, args);
 };
--- a/test/utils.test.js
+++ b/test/utils.test.js
@ -1,14 +1,14 @@
-// Copyright IBM Corp. 2016,2019. All Rights Reserved.
+// Copyright IBM Corp. 2014,2016. All Rights Reserved.
 // Node module: loopback-boot
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 'use strict';
-const utils = require('../lib/utils');
+var utils = require('../lib/utils');
-const expect = require('chai').expect;
+var expect = require('chai').expect;
-const sandbox = require('./helpers/sandbox');
+var sandbox = require('./helpers/sandbox');
-const appdir = require('./helpers/appdir');
+var appdir = require('./helpers/appdir');
 describe('utils', function() {
  beforeEach(sandbox.reset);
@ -17,13 +17,13 @@ describe('utils', function() {
  });
  describe('fileExistsSync', function() {
    it('returns false when a file does not exist', function() {
-      const doesNotExist = sandbox.resolve('does-not-exist.json');
+      var doesNotExist = sandbox.resolve('does-not-exist.json');
      expect(utils.fileExistsSync(doesNotExist))
        .to.equal(false);
    });
    it('returns true when a file does exist', function() {
-      const doesExist = appdir.writeConfigFileSync('does-exist.json', {
+      var doesExist = appdir.writeConfigFileSync('does-exist.json', {
        exists: true,
      });
      expect(utils.fileExistsSync(doesExist))