diff --git a/benchmarks/benchjs/casting.js b/benchmarks/benchjs/casting.js
index 21800a76a0..ab3326c2a5 100644
--- a/benchmarks/benchjs/casting.js
+++ b/benchmarks/benchjs/casting.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../../lib');
 const Benchmark = require('benchmark');
 
diff --git a/benchmarks/benchjs/delete.js b/benchmarks/benchjs/delete.js
index d79082fa45..da343dc85d 100644
--- a/benchmarks/benchjs/delete.js
+++ b/benchmarks/benchjs/delete.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../../lib');
 const Benchmark = require('benchmark');
 
diff --git a/benchmarks/benchjs/insert.js b/benchmarks/benchjs/insert.js
index 8b6bca637f..026e76bb9b 100644
--- a/benchmarks/benchjs/insert.js
+++ b/benchmarks/benchjs/insert.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../../lib');
 const Benchmark = require('benchmark');
 
diff --git a/benchmarks/benchjs/multiop.js b/benchmarks/benchjs/multiop.js
index 24077faef5..685ba697a4 100644
--- a/benchmarks/benchjs/multiop.js
+++ b/benchmarks/benchjs/multiop.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../../lib');
 const Benchmark = require('benchmark');
 
diff --git a/benchmarks/benchjs/population.js b/benchmarks/benchjs/population.js
index 7fb98f3aaa..4c4069772b 100644
--- a/benchmarks/benchjs/population.js
+++ b/benchmarks/benchjs/population.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../../lib');
 const Benchmark = require('benchmark');
 
diff --git a/benchmarks/benchjs/read.js b/benchmarks/benchjs/read.js
index d7117a3e49..31079bd4e5 100644
--- a/benchmarks/benchjs/read.js
+++ b/benchmarks/benchjs/read.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../../lib');
 const Benchmark = require('benchmark');
 
diff --git a/benchmarks/benchjs/update.js b/benchmarks/benchjs/update.js
index 72b33a7db8..6b10ea3440 100644
--- a/benchmarks/benchjs/update.js
+++ b/benchmarks/benchjs/update.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../../lib');
 const Benchmark = require('benchmark');
 
diff --git a/benchmarks/clone.js b/benchmarks/clone.js
index cc07b410e9..c8c65a5c8d 100644
--- a/benchmarks/clone.js
+++ b/benchmarks/clone.js
@@ -1,3 +1,4 @@
+'use strict';
 let mongoose = require('../'),
     Schema = mongoose.Schema;
 
diff --git a/benchmarks/create.js b/benchmarks/create.js
index 591107446f..beb6bf148a 100644
--- a/benchmarks/create.js
+++ b/benchmarks/create.js
@@ -1,5 +1,7 @@
 // require('nodetime').profile();
 
+'use strict';
+
 const mongoose = require('../../mongoose');
 const fs = require('fs');
 
diff --git a/benchmarks/index.js b/benchmarks/index.js
index 50e2447491..d4b6299d0c 100644
--- a/benchmarks/index.js
+++ b/benchmarks/index.js
@@ -1,3 +1,4 @@
+'use strict';
 const Buffer = require('safe-buffer').Buffer;
 
 Error.stackTraceLimit = Infinity;
diff --git a/benchmarks/mem.js b/benchmarks/mem.js
index 23c8609e73..77d098ff7f 100644
--- a/benchmarks/mem.js
+++ b/benchmarks/mem.js
@@ -1,3 +1,4 @@
+'use strict';
 let mongoose = require('../'),
     Schema = mongoose.Schema;
 
diff --git a/benchmarks/populate.js b/benchmarks/populate.js
index 54477d0546..f4460209dd 100644
--- a/benchmarks/populate.js
+++ b/benchmarks/populate.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../');
 const Schema = mongoose.Schema;
 const docs = process.argv[2] ? process.argv[2] | 0 : 100;
diff --git a/benchmarks/populationHeavyLoad.js b/benchmarks/populationHeavyLoad.js
index edcebce89a..8904d9f831 100644
--- a/benchmarks/populationHeavyLoad.js
+++ b/benchmarks/populationHeavyLoad.js
@@ -1,3 +1,4 @@
+'use strict';
 const tbd = require('tbd');
 const mongoose = require('../');
 const Schema = mongoose.Schema;
diff --git a/browser.js b/browser.js
index 764c49a796..4cf822804e 100644
--- a/browser.js
+++ b/browser.js
@@ -3,4 +3,6 @@
  *
  */
 
+'use strict';
+
 module.exports = require('./lib/browser');
diff --git a/docs/3.0.x/docs/helpers/filters.js b/docs/3.0.x/docs/helpers/filters.js
index 33546a7e80..95ff08931d 100644
--- a/docs/3.0.x/docs/helpers/filters.js
+++ b/docs/3.0.x/docs/helpers/filters.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var hl = require('highlight.js')
 
 module.exports = exports = function (jade) {
diff --git a/docs/3.0.x/docs/helpers/highlight.js b/docs/3.0.x/docs/helpers/highlight.js
index 8aca9b9e22..e9f850d131 100644
--- a/docs/3.0.x/docs/helpers/highlight.js
+++ b/docs/3.0.x/docs/helpers/highlight.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var h = require('highlight.js')
 
 function hl (str) {
diff --git a/docs/3.0.x/docs/helpers/href.js b/docs/3.0.x/docs/helpers/href.js
index e7299b1cf0..0e8285c34d 100644
--- a/docs/3.0.x/docs/helpers/href.js
+++ b/docs/3.0.x/docs/helpers/href.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str, char) {
   if ('string' != typeof str) return str;
   return encodeURIComponent(str.replace(/\.js$/, '').replace(/\.|#/g, char || '-'));
diff --git a/docs/3.0.x/docs/helpers/klass.js b/docs/3.0.x/docs/helpers/klass.js
index 0c4a865b43..d2009b87c3 100644
--- a/docs/3.0.x/docs/helpers/klass.js
+++ b/docs/3.0.x/docs/helpers/klass.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str) {
   var parts = str.replace(/\.js$/, '').split('/');
   return parts.join('_');
diff --git a/docs/3.0.x/docs/helpers/linktype.js b/docs/3.0.x/docs/helpers/linktype.js
index 997e740f67..fc1ec39d48 100644
--- a/docs/3.0.x/docs/helpers/linktype.js
+++ b/docs/3.0.x/docs/helpers/linktype.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var types = {};
 types.Object = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object';
 types.Boolean = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Boolean'
diff --git a/docs/3.0.x/docs/js/zepto.min.js b/docs/3.0.x/docs/js/zepto.min.js
index 428f84a28c..1cf1a23af7 100644
--- a/docs/3.0.x/docs/js/zepto.min.js
+++ b/docs/3.0.x/docs/js/zepto.min.js
@@ -1,2 +1,4 @@
 /* Zepto v1.0rc1 - polyfill zepto event detect fx ajax form touch - zeptojs.com/license */
+'use strict';
+
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diff --git a/docs/3.0.x/docs/source/api.js b/docs/3.0.x/docs/source/api.js
index 8fd87f0035..cadfbe41d1 100644
--- a/docs/3.0.x/docs/source/api.js
+++ b/docs/3.0.x/docs/source/api.js
@@ -2,6 +2,8 @@
  * Module dependencies
  */
 
+'use strict';
+
 var fs = require('fs');
 var link = require('../helpers/linktype');
 var hl = require('highlight.js')
diff --git a/docs/3.0.x/docs/source/index.js b/docs/3.0.x/docs/source/index.js
index d54229720a..54c7342253 100644
--- a/docs/3.0.x/docs/source/index.js
+++ b/docs/3.0.x/docs/source/index.js
@@ -1,4 +1,5 @@
 
+'use strict';
 exports['index.jade'] = require('./home')
 exports['docs/api.jade'] = require('./api')
 exports['docs/index.jade'] = { title: 'Getting Started' }
diff --git a/docs/3.0.x/docs/source/prior.js b/docs/3.0.x/docs/source/prior.js
index 2e03811d21..b10cf31086 100644
--- a/docs/3.0.x/docs/source/prior.js
+++ b/docs/3.0.x/docs/source/prior.js
@@ -1,3 +1,4 @@
+'use strict';
 var fs = require('fs')
 var releases = fs.readFileSync(__dirname + '/../releases', 'utf8');
 releases = releases.split('\n').filter(Boolean);
diff --git a/docs/3.1.x/docs/helpers/filters.js b/docs/3.1.x/docs/helpers/filters.js
index 33546a7e80..95ff08931d 100644
--- a/docs/3.1.x/docs/helpers/filters.js
+++ b/docs/3.1.x/docs/helpers/filters.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var hl = require('highlight.js')
 
 module.exports = exports = function (jade) {
diff --git a/docs/3.1.x/docs/helpers/highlight.js b/docs/3.1.x/docs/helpers/highlight.js
index 8aca9b9e22..e9f850d131 100644
--- a/docs/3.1.x/docs/helpers/highlight.js
+++ b/docs/3.1.x/docs/helpers/highlight.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var h = require('highlight.js')
 
 function hl (str) {
diff --git a/docs/3.1.x/docs/helpers/href.js b/docs/3.1.x/docs/helpers/href.js
index e7299b1cf0..0e8285c34d 100644
--- a/docs/3.1.x/docs/helpers/href.js
+++ b/docs/3.1.x/docs/helpers/href.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str, char) {
   if ('string' != typeof str) return str;
   return encodeURIComponent(str.replace(/\.js$/, '').replace(/\.|#/g, char || '-'));
diff --git a/docs/3.1.x/docs/helpers/klass.js b/docs/3.1.x/docs/helpers/klass.js
index 0c4a865b43..d2009b87c3 100644
--- a/docs/3.1.x/docs/helpers/klass.js
+++ b/docs/3.1.x/docs/helpers/klass.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str) {
   var parts = str.replace(/\.js$/, '').split('/');
   return parts.join('_');
diff --git a/docs/3.1.x/docs/helpers/linktype.js b/docs/3.1.x/docs/helpers/linktype.js
index 997e740f67..fc1ec39d48 100644
--- a/docs/3.1.x/docs/helpers/linktype.js
+++ b/docs/3.1.x/docs/helpers/linktype.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var types = {};
 types.Object = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object';
 types.Boolean = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Boolean'
diff --git a/docs/3.1.x/docs/js/zepto.min.js b/docs/3.1.x/docs/js/zepto.min.js
index 428f84a28c..1cf1a23af7 100644
--- a/docs/3.1.x/docs/js/zepto.min.js
+++ b/docs/3.1.x/docs/js/zepto.min.js
@@ -1,2 +1,4 @@
 /* Zepto v1.0rc1 - polyfill zepto event detect fx ajax form touch - zeptojs.com/license */
+'use strict';
+
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diff --git a/docs/3.1.x/docs/source/api.js b/docs/3.1.x/docs/source/api.js
index 8fd87f0035..cadfbe41d1 100644
--- a/docs/3.1.x/docs/source/api.js
+++ b/docs/3.1.x/docs/source/api.js
@@ -2,6 +2,8 @@
  * Module dependencies
  */
 
+'use strict';
+
 var fs = require('fs');
 var link = require('../helpers/linktype');
 var hl = require('highlight.js')
diff --git a/docs/3.1.x/docs/source/index.js b/docs/3.1.x/docs/source/index.js
index d54229720a..54c7342253 100644
--- a/docs/3.1.x/docs/source/index.js
+++ b/docs/3.1.x/docs/source/index.js
@@ -1,4 +1,5 @@
 
+'use strict';
 exports['index.jade'] = require('./home')
 exports['docs/api.jade'] = require('./api')
 exports['docs/index.jade'] = { title: 'Getting Started' }
diff --git a/docs/3.1.x/docs/source/prior.js b/docs/3.1.x/docs/source/prior.js
index 2e03811d21..b10cf31086 100644
--- a/docs/3.1.x/docs/source/prior.js
+++ b/docs/3.1.x/docs/source/prior.js
@@ -1,3 +1,4 @@
+'use strict';
 var fs = require('fs')
 var releases = fs.readFileSync(__dirname + '/../releases', 'utf8');
 releases = releases.split('\n').filter(Boolean);
diff --git a/docs/3.2.x/docs/helpers/filters.js b/docs/3.2.x/docs/helpers/filters.js
index 33546a7e80..95ff08931d 100644
--- a/docs/3.2.x/docs/helpers/filters.js
+++ b/docs/3.2.x/docs/helpers/filters.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var hl = require('highlight.js')
 
 module.exports = exports = function (jade) {
diff --git a/docs/3.2.x/docs/helpers/highlight.js b/docs/3.2.x/docs/helpers/highlight.js
index 8aca9b9e22..e9f850d131 100644
--- a/docs/3.2.x/docs/helpers/highlight.js
+++ b/docs/3.2.x/docs/helpers/highlight.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var h = require('highlight.js')
 
 function hl (str) {
diff --git a/docs/3.2.x/docs/helpers/href.js b/docs/3.2.x/docs/helpers/href.js
index e7299b1cf0..0e8285c34d 100644
--- a/docs/3.2.x/docs/helpers/href.js
+++ b/docs/3.2.x/docs/helpers/href.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str, char) {
   if ('string' != typeof str) return str;
   return encodeURIComponent(str.replace(/\.js$/, '').replace(/\.|#/g, char || '-'));
diff --git a/docs/3.2.x/docs/helpers/klass.js b/docs/3.2.x/docs/helpers/klass.js
index 0c4a865b43..d2009b87c3 100644
--- a/docs/3.2.x/docs/helpers/klass.js
+++ b/docs/3.2.x/docs/helpers/klass.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str) {
   var parts = str.replace(/\.js$/, '').split('/');
   return parts.join('_');
diff --git a/docs/3.2.x/docs/helpers/linktype.js b/docs/3.2.x/docs/helpers/linktype.js
index 997e740f67..fc1ec39d48 100644
--- a/docs/3.2.x/docs/helpers/linktype.js
+++ b/docs/3.2.x/docs/helpers/linktype.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var types = {};
 types.Object = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object';
 types.Boolean = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Boolean'
diff --git a/docs/3.2.x/docs/js/zepto.min.js b/docs/3.2.x/docs/js/zepto.min.js
index 428f84a28c..1cf1a23af7 100644
--- a/docs/3.2.x/docs/js/zepto.min.js
+++ b/docs/3.2.x/docs/js/zepto.min.js
@@ -1,2 +1,4 @@
 /* Zepto v1.0rc1 - polyfill zepto event detect fx ajax form touch - zeptojs.com/license */
+'use strict';
+
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diff --git a/docs/3.2.x/docs/source/api.js b/docs/3.2.x/docs/source/api.js
index 8fd87f0035..cadfbe41d1 100644
--- a/docs/3.2.x/docs/source/api.js
+++ b/docs/3.2.x/docs/source/api.js
@@ -2,6 +2,8 @@
  * Module dependencies
  */
 
+'use strict';
+
 var fs = require('fs');
 var link = require('../helpers/linktype');
 var hl = require('highlight.js')
diff --git a/docs/3.2.x/docs/source/index.js b/docs/3.2.x/docs/source/index.js
index 7eaf8a85b1..588f6430da 100644
--- a/docs/3.2.x/docs/source/index.js
+++ b/docs/3.2.x/docs/source/index.js
@@ -1,4 +1,5 @@
 
+'use strict';
 exports['index.jade'] = require('./home')
 exports['docs/api.jade'] = require('./api')
 exports['docs/index.jade'] = { title: 'Getting Started' }
diff --git a/docs/3.2.x/docs/source/prior.js b/docs/3.2.x/docs/source/prior.js
index 2e03811d21..b10cf31086 100644
--- a/docs/3.2.x/docs/source/prior.js
+++ b/docs/3.2.x/docs/source/prior.js
@@ -1,3 +1,4 @@
+'use strict';
 var fs = require('fs')
 var releases = fs.readFileSync(__dirname + '/../releases', 'utf8');
 releases = releases.split('\n').filter(Boolean);
diff --git a/docs/3.3.x/docs/helpers/filters.js b/docs/3.3.x/docs/helpers/filters.js
index 33546a7e80..95ff08931d 100644
--- a/docs/3.3.x/docs/helpers/filters.js
+++ b/docs/3.3.x/docs/helpers/filters.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var hl = require('highlight.js')
 
 module.exports = exports = function (jade) {
diff --git a/docs/3.3.x/docs/helpers/highlight.js b/docs/3.3.x/docs/helpers/highlight.js
index 8aca9b9e22..e9f850d131 100644
--- a/docs/3.3.x/docs/helpers/highlight.js
+++ b/docs/3.3.x/docs/helpers/highlight.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var h = require('highlight.js')
 
 function hl (str) {
diff --git a/docs/3.3.x/docs/helpers/href.js b/docs/3.3.x/docs/helpers/href.js
index e7299b1cf0..0e8285c34d 100644
--- a/docs/3.3.x/docs/helpers/href.js
+++ b/docs/3.3.x/docs/helpers/href.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str, char) {
   if ('string' != typeof str) return str;
   return encodeURIComponent(str.replace(/\.js$/, '').replace(/\.|#/g, char || '-'));
diff --git a/docs/3.3.x/docs/helpers/klass.js b/docs/3.3.x/docs/helpers/klass.js
index 0c4a865b43..d2009b87c3 100644
--- a/docs/3.3.x/docs/helpers/klass.js
+++ b/docs/3.3.x/docs/helpers/klass.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str) {
   var parts = str.replace(/\.js$/, '').split('/');
   return parts.join('_');
diff --git a/docs/3.3.x/docs/helpers/linktype.js b/docs/3.3.x/docs/helpers/linktype.js
index 997e740f67..fc1ec39d48 100644
--- a/docs/3.3.x/docs/helpers/linktype.js
+++ b/docs/3.3.x/docs/helpers/linktype.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var types = {};
 types.Object = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object';
 types.Boolean = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Boolean'
diff --git a/docs/3.3.x/docs/js/cookies.min.js b/docs/3.3.x/docs/js/cookies.min.js
index dc94dbc5bb..8f9c5b0cc5 100644
--- a/docs/3.3.x/docs/js/cookies.min.js
+++ b/docs/3.3.x/docs/js/cookies.min.js
@@ -1,4 +1,6 @@
 /*! Cookies.js - 0.2.0; Copyright (c) 2012, Scott Hamper; http://www.opensource.org/licenses/MIT */
+'use strict';
+
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diff --git a/docs/3.3.x/docs/js/zepto.min.js b/docs/3.3.x/docs/js/zepto.min.js
index 428f84a28c..1cf1a23af7 100644
--- a/docs/3.3.x/docs/js/zepto.min.js
+++ b/docs/3.3.x/docs/js/zepto.min.js
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diff --git a/docs/3.3.x/docs/source/api.js b/docs/3.3.x/docs/source/api.js
index 8fd87f0035..cadfbe41d1 100644
--- a/docs/3.3.x/docs/source/api.js
+++ b/docs/3.3.x/docs/source/api.js
@@ -2,6 +2,8 @@
  * Module dependencies
  */
 
+'use strict';
+
 var fs = require('fs');
 var link = require('../helpers/linktype');
 var hl = require('highlight.js')
diff --git a/docs/3.3.x/docs/source/index.js b/docs/3.3.x/docs/source/index.js
index 18b3eeb571..82921f05ee 100644
--- a/docs/3.3.x/docs/source/index.js
+++ b/docs/3.3.x/docs/source/index.js
@@ -1,4 +1,5 @@
 
+'use strict';
 exports['index.jade'] = require('./home')
 exports['docs/api.jade'] = require('./api')
 exports['docs/index.jade'] = { title: 'Getting Started' }
diff --git a/docs/3.3.x/docs/source/prior.js b/docs/3.3.x/docs/source/prior.js
index 2e03811d21..b10cf31086 100644
--- a/docs/3.3.x/docs/source/prior.js
+++ b/docs/3.3.x/docs/source/prior.js
@@ -1,3 +1,4 @@
+'use strict';
 var fs = require('fs')
 var releases = fs.readFileSync(__dirname + '/../releases', 'utf8');
 releases = releases.split('\n').filter(Boolean);
diff --git a/docs/3.3.x/docs/source/production.js b/docs/3.3.x/docs/source/production.js
index 9fdbcfffbc..1b2bfcbd32 100644
--- a/docs/3.3.x/docs/source/production.js
+++ b/docs/3.3.x/docs/source/production.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var fs = require('fs')
 var images = fs.readFileSync(__dirname + '/../images/apps/urls', 'utf-8').split('\n');
 
diff --git a/docs/3.4.x/docs/helpers/filters.js b/docs/3.4.x/docs/helpers/filters.js
index 33546a7e80..95ff08931d 100644
--- a/docs/3.4.x/docs/helpers/filters.js
+++ b/docs/3.4.x/docs/helpers/filters.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var hl = require('highlight.js')
 
 module.exports = exports = function (jade) {
diff --git a/docs/3.4.x/docs/helpers/highlight.js b/docs/3.4.x/docs/helpers/highlight.js
index 8aca9b9e22..e9f850d131 100644
--- a/docs/3.4.x/docs/helpers/highlight.js
+++ b/docs/3.4.x/docs/helpers/highlight.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var h = require('highlight.js')
 
 function hl (str) {
diff --git a/docs/3.4.x/docs/helpers/href.js b/docs/3.4.x/docs/helpers/href.js
index e7299b1cf0..0e8285c34d 100644
--- a/docs/3.4.x/docs/helpers/href.js
+++ b/docs/3.4.x/docs/helpers/href.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str, char) {
   if ('string' != typeof str) return str;
   return encodeURIComponent(str.replace(/\.js$/, '').replace(/\.|#/g, char || '-'));
diff --git a/docs/3.4.x/docs/helpers/klass.js b/docs/3.4.x/docs/helpers/klass.js
index 0c4a865b43..d2009b87c3 100644
--- a/docs/3.4.x/docs/helpers/klass.js
+++ b/docs/3.4.x/docs/helpers/klass.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str) {
   var parts = str.replace(/\.js$/, '').split('/');
   return parts.join('_');
diff --git a/docs/3.4.x/docs/helpers/linktype.js b/docs/3.4.x/docs/helpers/linktype.js
index 997e740f67..fc1ec39d48 100644
--- a/docs/3.4.x/docs/helpers/linktype.js
+++ b/docs/3.4.x/docs/helpers/linktype.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var types = {};
 types.Object = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object';
 types.Boolean = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Boolean'
diff --git a/docs/3.4.x/docs/js/cookies.min.js b/docs/3.4.x/docs/js/cookies.min.js
index dc94dbc5bb..8f9c5b0cc5 100644
--- a/docs/3.4.x/docs/js/cookies.min.js
+++ b/docs/3.4.x/docs/js/cookies.min.js
@@ -1,4 +1,6 @@
 /*! Cookies.js - 0.2.0; Copyright (c) 2012, Scott Hamper; http://www.opensource.org/licenses/MIT */
+'use strict';
+
 (function(f,e){var b=function(c,d,a){return 1===arguments.length?b.get(c):b.set(c,d,a)};b.get=function(c){f.cookie!==b._cacheString&&b._populateCache();return b._cache[c]};b.defaults={path:"/"};b.set=function(c,d,a){a={path:a&&a.path||b.defaults.path,domain:a&&a.domain||b.defaults.domain,expires:a&&a.expires||b.defaults.expires,secure:a&&a.secure!==e?a.secure:b.defaults.secure};d===e&&(a.expires=-1);switch(typeof a.expires){case "number":a.expires=new Date((new Date).getTime()+1E3*a.expires);break;
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diff --git a/docs/3.4.x/docs/js/zepto.min.js b/docs/3.4.x/docs/js/zepto.min.js
index 428f84a28c..1cf1a23af7 100644
--- a/docs/3.4.x/docs/js/zepto.min.js
+++ b/docs/3.4.x/docs/js/zepto.min.js
@@ -1,2 +1,4 @@
 /* Zepto v1.0rc1 - polyfill zepto event detect fx ajax form touch - zeptojs.com/license */
+'use strict';
+
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diff --git a/docs/3.4.x/docs/source/api.js b/docs/3.4.x/docs/source/api.js
index 8fd87f0035..cadfbe41d1 100644
--- a/docs/3.4.x/docs/source/api.js
+++ b/docs/3.4.x/docs/source/api.js
@@ -2,6 +2,8 @@
  * Module dependencies
  */
 
+'use strict';
+
 var fs = require('fs');
 var link = require('../helpers/linktype');
 var hl = require('highlight.js')
diff --git a/docs/3.4.x/docs/source/index.js b/docs/3.4.x/docs/source/index.js
index 18b3eeb571..82921f05ee 100644
--- a/docs/3.4.x/docs/source/index.js
+++ b/docs/3.4.x/docs/source/index.js
@@ -1,4 +1,5 @@
 
+'use strict';
 exports['index.jade'] = require('./home')
 exports['docs/api.jade'] = require('./api')
 exports['docs/index.jade'] = { title: 'Getting Started' }
diff --git a/docs/3.4.x/docs/source/prior.js b/docs/3.4.x/docs/source/prior.js
index 2e03811d21..b10cf31086 100644
--- a/docs/3.4.x/docs/source/prior.js
+++ b/docs/3.4.x/docs/source/prior.js
@@ -1,3 +1,4 @@
+'use strict';
 var fs = require('fs')
 var releases = fs.readFileSync(__dirname + '/../releases', 'utf8');
 releases = releases.split('\n').filter(Boolean);
diff --git a/docs/3.4.x/docs/source/production.js b/docs/3.4.x/docs/source/production.js
index 9fdbcfffbc..1b2bfcbd32 100644
--- a/docs/3.4.x/docs/source/production.js
+++ b/docs/3.4.x/docs/source/production.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var fs = require('fs')
 var images = fs.readFileSync(__dirname + '/../images/apps/urls', 'utf-8').split('\n');
 
diff --git a/docs/3.5.x/docs/helpers/filters.js b/docs/3.5.x/docs/helpers/filters.js
index 33546a7e80..95ff08931d 100644
--- a/docs/3.5.x/docs/helpers/filters.js
+++ b/docs/3.5.x/docs/helpers/filters.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var hl = require('highlight.js')
 
 module.exports = exports = function (jade) {
diff --git a/docs/3.5.x/docs/helpers/highlight.js b/docs/3.5.x/docs/helpers/highlight.js
index 8aca9b9e22..e9f850d131 100644
--- a/docs/3.5.x/docs/helpers/highlight.js
+++ b/docs/3.5.x/docs/helpers/highlight.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var h = require('highlight.js')
 
 function hl (str) {
diff --git a/docs/3.5.x/docs/helpers/href.js b/docs/3.5.x/docs/helpers/href.js
index e6d6568b12..c36746ebba 100644
--- a/docs/3.5.x/docs/helpers/href.js
+++ b/docs/3.5.x/docs/helpers/href.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str, char) {
   if ('string' != typeof str) return str;
   return encodeURIComponent(
diff --git a/docs/3.5.x/docs/helpers/klass.js b/docs/3.5.x/docs/helpers/klass.js
index 0c4a865b43..d2009b87c3 100644
--- a/docs/3.5.x/docs/helpers/klass.js
+++ b/docs/3.5.x/docs/helpers/klass.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str) {
   var parts = str.replace(/\.js$/, '').split('/');
   return parts.join('_');
diff --git a/docs/3.5.x/docs/helpers/linktype.js b/docs/3.5.x/docs/helpers/linktype.js
index 997e740f67..fc1ec39d48 100644
--- a/docs/3.5.x/docs/helpers/linktype.js
+++ b/docs/3.5.x/docs/helpers/linktype.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var types = {};
 types.Object = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object';
 types.Boolean = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Boolean'
diff --git a/docs/3.5.x/docs/js/cookies.min.js b/docs/3.5.x/docs/js/cookies.min.js
index dc94dbc5bb..8f9c5b0cc5 100644
--- a/docs/3.5.x/docs/js/cookies.min.js
+++ b/docs/3.5.x/docs/js/cookies.min.js
@@ -1,4 +1,6 @@
 /*! Cookies.js - 0.2.0; Copyright (c) 2012, Scott Hamper; http://www.opensource.org/licenses/MIT */
+'use strict';
+
 (function(f,e){var b=function(c,d,a){return 1===arguments.length?b.get(c):b.set(c,d,a)};b.get=function(c){f.cookie!==b._cacheString&&b._populateCache();return b._cache[c]};b.defaults={path:"/"};b.set=function(c,d,a){a={path:a&&a.path||b.defaults.path,domain:a&&a.domain||b.defaults.domain,expires:a&&a.expires||b.defaults.expires,secure:a&&a.secure!==e?a.secure:b.defaults.secure};d===e&&(a.expires=-1);switch(typeof a.expires){case "number":a.expires=new Date((new Date).getTime()+1E3*a.expires);break;
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 a)),a=decodeURIComponent(c[d].substr(a+1));b._cache[g]===e&&(b._cache[g]=a)}};b.enabled=function(){var c="1"===b.set("cookies.js","1").get("cookies.js");b.expire("cookies.js");return c}();"function"===typeof define&&define.amd?define(function(){return b}):"undefined"!==typeof exports?("undefined"!=typeof module&&module.exports&&(exports=module.exports=b),exports.Cookies=b):window.Cookies=b})(document);
\ No newline at end of file
diff --git a/docs/3.5.x/docs/js/zepto.min.js b/docs/3.5.x/docs/js/zepto.min.js
index 428f84a28c..1cf1a23af7 100644
--- a/docs/3.5.x/docs/js/zepto.min.js
+++ b/docs/3.5.x/docs/js/zepto.min.js
@@ -1,2 +1,4 @@
 /* Zepto v1.0rc1 - polyfill zepto event detect fx ajax form touch - zeptojs.com/license */
+'use strict';
+
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diff --git a/docs/3.5.x/docs/source/api.js b/docs/3.5.x/docs/source/api.js
index 2acf17aeeb..97546c780a 100644
--- a/docs/3.5.x/docs/source/api.js
+++ b/docs/3.5.x/docs/source/api.js
@@ -2,6 +2,8 @@
  * Module dependencies
  */
 
+'use strict';
+
 var fs = require('fs');
 var link = require('../helpers/linktype');
 var hl = require('highlight.js')
diff --git a/docs/3.5.x/docs/source/index.js b/docs/3.5.x/docs/source/index.js
index 18b3eeb571..82921f05ee 100644
--- a/docs/3.5.x/docs/source/index.js
+++ b/docs/3.5.x/docs/source/index.js
@@ -1,4 +1,5 @@
 
+'use strict';
 exports['index.jade'] = require('./home')
 exports['docs/api.jade'] = require('./api')
 exports['docs/index.jade'] = { title: 'Getting Started' }
diff --git a/docs/3.5.x/docs/source/prior.js b/docs/3.5.x/docs/source/prior.js
index 350ec4994b..1f2ee54e06 100644
--- a/docs/3.5.x/docs/source/prior.js
+++ b/docs/3.5.x/docs/source/prior.js
@@ -1,3 +1,4 @@
+'use strict';
 var fs = require('fs')
 var releases = fs.readFileSync(__dirname + '/../releases', 'utf8');
 releases = releases.split('\n').filter(Boolean);
diff --git a/docs/3.5.x/docs/source/production.js b/docs/3.5.x/docs/source/production.js
index 9fdbcfffbc..1b2bfcbd32 100644
--- a/docs/3.5.x/docs/source/production.js
+++ b/docs/3.5.x/docs/source/production.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var fs = require('fs')
 var images = fs.readFileSync(__dirname + '/../images/apps/urls', 'utf-8').split('\n');
 
diff --git a/docs/helpers/href.js b/docs/helpers/href.js
index 471843440a..73d265b7e3 100644
--- a/docs/helpers/href.js
+++ b/docs/helpers/href.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str, char) {
   if ('string' !== typeof str) return str;
   return encodeURIComponent(
diff --git a/docs/helpers/klass.js b/docs/helpers/klass.js
index 0c4a865b43..d2009b87c3 100644
--- a/docs/helpers/klass.js
+++ b/docs/helpers/klass.js
@@ -1,4 +1,5 @@
 
+'use strict';
 module.exports = exports = function (str) {
   var parts = str.replace(/\.js$/, '').split('/');
   return parts.join('_');
diff --git a/docs/helpers/linktype.js b/docs/helpers/linktype.js
index fdd4ec0238..e7c22cfdb5 100644
--- a/docs/helpers/linktype.js
+++ b/docs/helpers/linktype.js
@@ -1,4 +1,5 @@
 
+'use strict';
 var types = {};
 types.Object = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object';
 types.Boolean = 'https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Boolean'
diff --git a/docs/js/cookies.min.js b/docs/js/cookies.min.js
index dc94dbc5bb..8f9c5b0cc5 100644
--- a/docs/js/cookies.min.js
+++ b/docs/js/cookies.min.js
@@ -1,4 +1,6 @@
 /*! Cookies.js - 0.2.0; Copyright (c) 2012, Scott Hamper; http://www.opensource.org/licenses/MIT */
+'use strict';
+
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diff --git a/docs/js/native.js b/docs/js/native.js
index a33034f93d..0b947e1c78 100644
--- a/docs/js/native.js
+++ b/docs/js/native.js
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index 428f84a28c..1cf1a23af7 100644
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diff --git a/docs/source/acquit.js b/docs/source/acquit.js
index 91ede15c43..c53ba3866b 100644
--- a/docs/source/acquit.js
+++ b/docs/source/acquit.js
@@ -1,3 +1,4 @@
+'use strict';
 var fs = require('fs');
 var acquit = require('acquit');
 var hl = require('highlight.js');
diff --git a/docs/source/index.js b/docs/source/index.js
index 2c415f2e18..74662c4ea9 100644
--- a/docs/source/index.js
+++ b/docs/source/index.js
@@ -1,4 +1,5 @@
 
+'use strict';
 exports['index.jade'] = require('./home');
 exports['docs/api.jade'] = require('./api');
 exports['docs/browser.jade'] = { guide: true, title: 'Browser Library', acquit: true };
diff --git a/docs/source/prior.js b/docs/source/prior.js
index 350ec4994b..1f2ee54e06 100644
--- a/docs/source/prior.js
+++ b/docs/source/prior.js
@@ -1,3 +1,4 @@
+'use strict';
 var fs = require('fs')
 var releases = fs.readFileSync(__dirname + '/../releases', 'utf8');
 releases = releases.split('\n').filter(Boolean);
diff --git a/docs/source/production.js b/docs/source/production.js
index c10a8b91bd..9a9cb59beb 100644
--- a/docs/source/production.js
+++ b/docs/source/production.js
@@ -1,3 +1,4 @@
+'use strict';
 module.exports = {
     images: []
   , title: 'Production'
diff --git a/examples/aggregate/aggregate.js b/examples/aggregate/aggregate.js
index d64f1c799f..4e9de2a669 100644
--- a/examples/aggregate/aggregate.js
+++ b/examples/aggregate/aggregate.js
@@ -1,5 +1,7 @@
 
 // import async to make control flow simplier
+'use strict';
+
 const async = require('async');
 
 // import the rest of the normal stuff
diff --git a/examples/aggregate/person.js b/examples/aggregate/person.js
index 8288c55033..76ec8a0cab 100644
--- a/examples/aggregate/person.js
+++ b/examples/aggregate/person.js
@@ -1,5 +1,7 @@
 
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/doc-methods.js b/examples/doc-methods.js
index d64434070d..51d7048923 100644
--- a/examples/doc-methods.js
+++ b/examples/doc-methods.js
@@ -1,4 +1,5 @@
 
+'use strict';
 const mongoose = require('mongoose');
 const Schema = mongoose.Schema;
 
diff --git a/examples/express/connection-sharing/app.js b/examples/express/connection-sharing/app.js
index 9122d84e9f..750e1db0da 100644
--- a/examples/express/connection-sharing/app.js
+++ b/examples/express/connection-sharing/app.js
@@ -1,4 +1,5 @@
 
+'use strict';
 const express = require('express');
 const mongoose = require('../../../lib');
 
diff --git a/examples/express/connection-sharing/modelA.js b/examples/express/connection-sharing/modelA.js
index 354e527f10..85b8cc2d7d 100644
--- a/examples/express/connection-sharing/modelA.js
+++ b/examples/express/connection-sharing/modelA.js
@@ -1,3 +1,4 @@
+'use strict';
 const Schema = require('../../../lib').Schema;
 const mySchema = Schema({name: String});
 
diff --git a/examples/express/connection-sharing/routes.js b/examples/express/connection-sharing/routes.js
index 022205e7de..231f5fb2c8 100644
--- a/examples/express/connection-sharing/routes.js
+++ b/examples/express/connection-sharing/routes.js
@@ -1,4 +1,5 @@
 
+'use strict';
 const model = require('./modelA');
 
 exports.home = function(req, res, next) {
diff --git a/examples/geospatial/geoJSONSchema.js b/examples/geospatial/geoJSONSchema.js
index 4457d4fde5..d85a951122 100644
--- a/examples/geospatial/geoJSONSchema.js
+++ b/examples/geospatial/geoJSONSchema.js
@@ -1,5 +1,7 @@
 
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/geospatial/geoJSONexample.js b/examples/geospatial/geoJSONexample.js
index fca21fecac..749dbd9d3e 100644
--- a/examples/geospatial/geoJSONexample.js
+++ b/examples/geospatial/geoJSONexample.js
@@ -1,4 +1,6 @@
 // import async to make control flow simplier
+'use strict';
+
 const async = require('async');
 
 // import the rest of the normal stuff
diff --git a/examples/geospatial/geospatial.js b/examples/geospatial/geospatial.js
index 8245466e01..6241fdcfc7 100644
--- a/examples/geospatial/geospatial.js
+++ b/examples/geospatial/geospatial.js
@@ -1,4 +1,6 @@
 // import async to make control flow simplier
+'use strict';
+
 const async = require('async');
 
 // import the rest of the normal stuff
diff --git a/examples/geospatial/person.js b/examples/geospatial/person.js
index 2327b56dbe..1f51af1943 100644
--- a/examples/geospatial/person.js
+++ b/examples/geospatial/person.js
@@ -1,4 +1,6 @@
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/globalschemas/gs_example.js b/examples/globalschemas/gs_example.js
index d1551a1eb7..da1416f0d2 100644
--- a/examples/globalschemas/gs_example.js
+++ b/examples/globalschemas/gs_example.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../../lib');
 
 
diff --git a/examples/globalschemas/person.js b/examples/globalschemas/person.js
index a158e7d968..f598dd3fb6 100644
--- a/examples/globalschemas/person.js
+++ b/examples/globalschemas/person.js
@@ -1,4 +1,6 @@
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/lean/lean.js b/examples/lean/lean.js
index 3947668db2..b244ae0266 100644
--- a/examples/lean/lean.js
+++ b/examples/lean/lean.js
@@ -1,5 +1,7 @@
 
 // import async to make control flow simplier
+'use strict';
+
 const async = require('async');
 
 // import the rest of the normal stuff
diff --git a/examples/lean/person.js b/examples/lean/person.js
index 233226352a..c052f7f24d 100644
--- a/examples/lean/person.js
+++ b/examples/lean/person.js
@@ -1,4 +1,6 @@
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/mapreduce/mapreduce.js b/examples/mapreduce/mapreduce.js
index 063ae5a01f..493d8d43b4 100644
--- a/examples/mapreduce/mapreduce.js
+++ b/examples/mapreduce/mapreduce.js
@@ -1,4 +1,6 @@
 // import async to make control flow simplier
+'use strict';
+
 const async = require('async');
 
 // import the rest of the normal stuff
diff --git a/examples/mapreduce/person.js b/examples/mapreduce/person.js
index efdd108a00..3f1a651a3d 100644
--- a/examples/mapreduce/person.js
+++ b/examples/mapreduce/person.js
@@ -1,5 +1,7 @@
 
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/population/population-across-three-collections.js b/examples/population/population-across-three-collections.js
index 0374f7d2a3..630ea5f2db 100644
--- a/examples/population/population-across-three-collections.js
+++ b/examples/population/population-across-three-collections.js
@@ -1,4 +1,5 @@
 
+'use strict';
 const assert = require('assert');
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
diff --git a/examples/population/population-basic.js b/examples/population/population-basic.js
index 8fc4350dbb..da1b1cd3f4 100644
--- a/examples/population/population-basic.js
+++ b/examples/population/population-basic.js
@@ -1,4 +1,5 @@
 
+'use strict';
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/population/population-of-existing-doc.js b/examples/population/population-of-existing-doc.js
index 7da866a6e0..543a161a9b 100644
--- a/examples/population/population-of-existing-doc.js
+++ b/examples/population/population-of-existing-doc.js
@@ -1,4 +1,5 @@
 
+'use strict';
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/population/population-of-multiple-existing-docs.js b/examples/population/population-of-multiple-existing-docs.js
index 4dfeee7663..9e9b99493f 100644
--- a/examples/population/population-of-multiple-existing-docs.js
+++ b/examples/population/population-of-multiple-existing-docs.js
@@ -1,4 +1,5 @@
 
+'use strict';
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/population/population-options.js b/examples/population/population-options.js
index 2a5b57c2de..ab32e20385 100644
--- a/examples/population/population-options.js
+++ b/examples/population/population-options.js
@@ -1,4 +1,5 @@
 
+'use strict';
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/population/population-plain-objects.js b/examples/population/population-plain-objects.js
index cdaf870e9e..aad5fa50e4 100644
--- a/examples/population/population-plain-objects.js
+++ b/examples/population/population-plain-objects.js
@@ -1,4 +1,5 @@
 
+'use strict';
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/promises/person.js b/examples/promises/person.js
index 4dbe4c6a05..2f8f6b0429 100644
--- a/examples/promises/person.js
+++ b/examples/promises/person.js
@@ -1,5 +1,7 @@
 
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/promises/promise.js b/examples/promises/promise.js
index 735eb6b47c..ae4ba45a8b 100644
--- a/examples/promises/promise.js
+++ b/examples/promises/promise.js
@@ -1,4 +1,6 @@
 // import async to make control flow simplier
+'use strict';
+
 const async = require('async');
 
 // import the rest of the normal stuff
diff --git a/examples/querybuilder/person.js b/examples/querybuilder/person.js
index 4dbe4c6a05..2f8f6b0429 100644
--- a/examples/querybuilder/person.js
+++ b/examples/querybuilder/person.js
@@ -1,5 +1,7 @@
 
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/querybuilder/querybuilder.js b/examples/querybuilder/querybuilder.js
index 889f4c1ae1..67fbb79b50 100644
--- a/examples/querybuilder/querybuilder.js
+++ b/examples/querybuilder/querybuilder.js
@@ -1,5 +1,7 @@
 
 // import async to make control flow simplier
+'use strict';
+
 const async = require('async');
 
 // import the rest of the normal stuff
diff --git a/examples/replicasets/person.js b/examples/replicasets/person.js
index 4dbe4c6a05..2f8f6b0429 100644
--- a/examples/replicasets/person.js
+++ b/examples/replicasets/person.js
@@ -1,5 +1,7 @@
 
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/replicasets/replica-sets.js b/examples/replicasets/replica-sets.js
index bfd4603b50..b52298f161 100644
--- a/examples/replicasets/replica-sets.js
+++ b/examples/replicasets/replica-sets.js
@@ -1,5 +1,7 @@
 
 // import async to make control flow simplier
+'use strict';
+
 const async = require('async');
 
 // import the rest of the normal stuff
diff --git a/examples/schema/schema.js b/examples/schema/schema.js
index ac64b1f504..7ecd66fd73 100644
--- a/examples/schema/schema.js
+++ b/examples/schema/schema.js
@@ -2,8 +2,9 @@
  * Module dependencies.
  */
 
-let mongoose = require('../../lib'),
-    Schema = mongoose.Schema;
+'use strict';
+
+let mongoose = require('../../lib'), Schema = mongoose.Schema;
 
 /**
  * Schema definition
diff --git a/examples/schema/storing-schemas-as-json/index.js b/examples/schema/storing-schemas-as-json/index.js
index 1d1764fc6c..cbc6942c4f 100644
--- a/examples/schema/storing-schemas-as-json/index.js
+++ b/examples/schema/storing-schemas-as-json/index.js
@@ -1,5 +1,7 @@
 
 // modules
+'use strict';
+
 const mongoose = require('../../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/statics/person.js b/examples/statics/person.js
index 7750260b3a..02987f90a2 100644
--- a/examples/statics/person.js
+++ b/examples/statics/person.js
@@ -1,4 +1,6 @@
 // import the necessary modules
+'use strict';
+
 const mongoose = require('../../lib');
 const Schema = mongoose.Schema;
 
diff --git a/examples/statics/statics.js b/examples/statics/statics.js
index c09632eb05..53a0106deb 100644
--- a/examples/statics/statics.js
+++ b/examples/statics/statics.js
@@ -1,3 +1,4 @@
+'use strict';
 const mongoose = require('../../lib');
 
 
diff --git a/format_deps.js b/format_deps.js
index 7fbc0cc632..90908b9cd6 100644
--- a/format_deps.js
+++ b/format_deps.js
@@ -1,3 +1,4 @@
+'use strict';
 const p = require('./package.json');
 const _ = require('lodash');
 
diff --git a/index.js b/index.js
index e7e6278591..a938b443d4 100644
--- a/index.js
+++ b/index.js
@@ -4,4 +4,6 @@
  *
  */
 
+'use strict';
+
 module.exports = require('./lib/');
diff --git a/lib/aggregate.js b/lib/aggregate.js
index 75f13eb4fd..6ce0ee634f 100644
--- a/lib/aggregate.js
+++ b/lib/aggregate.js
@@ -2,6 +2,8 @@
  * Module dependencies
  */
 
+'use strict';
+
 const AggregationCursor = require('./cursor/AggregationCursor');
 const Query = require('./query');
 const util = require('util');
diff --git a/lib/browser.js b/lib/browser.js
index b53d51a512..8b9b4b7bd2 100644
--- a/lib/browser.js
+++ b/lib/browser.js
@@ -1,5 +1,7 @@
 /* eslint-env browser */
 
+'use strict';
+
 require('./driver').set(require('./drivers/browser'));
 
 const DocumentProvider = require('./document_provider.js');
diff --git a/lib/browserDocument.js b/lib/browserDocument.js
index bc9c4a7148..80976ca268 100644
--- a/lib/browserDocument.js
+++ b/lib/browserDocument.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const NodeJSDocument = require('./document');
 const EventEmitter = require('events').EventEmitter;
 const MongooseError = require('./error');
diff --git a/lib/connectionstate.js b/lib/connectionstate.js
index 7e426b4721..920f45bee9 100644
--- a/lib/connectionstate.js
+++ b/lib/connectionstate.js
@@ -3,6 +3,8 @@
  * Connection states
  */
 
+'use strict';
+
 const STATES = module.exports = exports = Object.create(null);
 
 const disconnected = 'disconnected';
diff --git a/lib/cursor/AggregationCursor.js b/lib/cursor/AggregationCursor.js
index 6c00c2e1ba..76b0828501 100644
--- a/lib/cursor/AggregationCursor.js
+++ b/lib/cursor/AggregationCursor.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const Readable = require('stream').Readable;
 const eachAsync = require('../helpers/cursor/eachAsync');
 const util = require('util');
diff --git a/lib/cursor/QueryCursor.js b/lib/cursor/QueryCursor.js
index 52ca63e999..3a7cf68270 100644
--- a/lib/cursor/QueryCursor.js
+++ b/lib/cursor/QueryCursor.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const Readable = require('stream').Readable;
 const eachAsync = require('../helpers/cursor/eachAsync');
 const helpers = require('../queryhelpers');
diff --git a/lib/drivers/browser/ReadPreference.js b/lib/drivers/browser/ReadPreference.js
index f20cd6cc0d..1363570810 100644
--- a/lib/drivers/browser/ReadPreference.js
+++ b/lib/drivers/browser/ReadPreference.js
@@ -2,4 +2,6 @@
  * ignore
  */
 
+'use strict';
+
 module.exports = function() {};
diff --git a/lib/drivers/browser/binary.js b/lib/drivers/browser/binary.js
index bc565fbd2b..4658f7b9e0 100644
--- a/lib/drivers/browser/binary.js
+++ b/lib/drivers/browser/binary.js
@@ -3,6 +3,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const Binary = require('bson').Binary;
 
 /*!
diff --git a/lib/drivers/browser/decimal128.js b/lib/drivers/browser/decimal128.js
index ecc1ae3b9b..5668182b35 100644
--- a/lib/drivers/browser/decimal128.js
+++ b/lib/drivers/browser/decimal128.js
@@ -2,4 +2,6 @@
  * ignore
  */
 
+'use strict';
+
 module.exports = require('bson').Decimal128;
diff --git a/lib/drivers/browser/index.js b/lib/drivers/browser/index.js
index a996fdb526..56d0b8a75c 100644
--- a/lib/drivers/browser/index.js
+++ b/lib/drivers/browser/index.js
@@ -2,6 +2,8 @@
  * Module exports.
  */
 
+'use strict';
+
 exports.Binary = require('./binary');
 exports.Collection = function() {
   throw new Error('Cannot create a collection from browser library');
diff --git a/lib/drivers/browser/objectid.js b/lib/drivers/browser/objectid.js
index d9444ba84b..b1e603d714 100644
--- a/lib/drivers/browser/objectid.js
+++ b/lib/drivers/browser/objectid.js
@@ -5,6 +5,8 @@
  * @see ObjectId
  */
 
+'use strict';
+
 const ObjectId = require('bson').ObjectID;
 
 /*!
diff --git a/lib/drivers/node-mongodb-native/ReadPreference.js b/lib/drivers/node-mongodb-native/ReadPreference.js
index 3d16825cd8..024ee181a5 100644
--- a/lib/drivers/node-mongodb-native/ReadPreference.js
+++ b/lib/drivers/node-mongodb-native/ReadPreference.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const mongodb = require('mongodb');
 const ReadPref = mongodb.ReadPreference;
 
diff --git a/lib/drivers/node-mongodb-native/binary.js b/lib/drivers/node-mongodb-native/binary.js
index 8b1003762f..4e3c86f78c 100644
--- a/lib/drivers/node-mongodb-native/binary.js
+++ b/lib/drivers/node-mongodb-native/binary.js
@@ -3,6 +3,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const Binary = require('mongodb').Binary;
 
 module.exports = exports = Binary;
diff --git a/lib/drivers/node-mongodb-native/connection.js b/lib/drivers/node-mongodb-native/connection.js
index 2489e05dbd..91affff2f1 100644
--- a/lib/drivers/node-mongodb-native/connection.js
+++ b/lib/drivers/node-mongodb-native/connection.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseConnection = require('../../connection');
 const STATES = require('../../connectionstate');
 
diff --git a/lib/drivers/node-mongodb-native/decimal128.js b/lib/drivers/node-mongodb-native/decimal128.js
index d1f04de965..c895f17fd2 100644
--- a/lib/drivers/node-mongodb-native/decimal128.js
+++ b/lib/drivers/node-mongodb-native/decimal128.js
@@ -2,4 +2,6 @@
  * ignore
  */
 
+'use strict';
+
 module.exports = require('mongodb').Decimal128;
diff --git a/lib/drivers/node-mongodb-native/index.js b/lib/drivers/node-mongodb-native/index.js
index b9fa17a43f..648207d712 100644
--- a/lib/drivers/node-mongodb-native/index.js
+++ b/lib/drivers/node-mongodb-native/index.js
@@ -2,6 +2,8 @@
  * Module exports.
  */
 
+'use strict';
+
 exports.Binary = require('./binary');
 exports.Collection = require('./collection');
 exports.Decimal128 = require('./decimal128');
diff --git a/lib/drivers/node-mongodb-native/objectid.js b/lib/drivers/node-mongodb-native/objectid.js
index cc2b560027..6f432b7968 100644
--- a/lib/drivers/node-mongodb-native/objectid.js
+++ b/lib/drivers/node-mongodb-native/objectid.js
@@ -5,6 +5,8 @@
  * @see ObjectId
  */
 
+'use strict';
+
 const ObjectId = require('mongodb').ObjectId;
 
 /*!
diff --git a/lib/error/browserMissingSchema.js b/lib/error/browserMissingSchema.js
index 93813f9168..852f8739bc 100644
--- a/lib/error/browserMissingSchema.js
+++ b/lib/error/browserMissingSchema.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseError = require('./');
 
 /*!
diff --git a/lib/error/disconnected.js b/lib/error/disconnected.js
index 9f2857f316..f542459e6a 100644
--- a/lib/error/disconnected.js
+++ b/lib/error/disconnected.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseError = require('./');
 
 /**
diff --git a/lib/error/divergentArray.js b/lib/error/divergentArray.js
index 37c631c75f..872fd2bfac 100644
--- a/lib/error/divergentArray.js
+++ b/lib/error/divergentArray.js
@@ -3,6 +3,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseError = require('./');
 
 /*!
diff --git a/lib/error/messages.js b/lib/error/messages.js
index e6ffa3f99a..4483a86d7a 100644
--- a/lib/error/messages.js
+++ b/lib/error/messages.js
@@ -21,6 +21,8 @@
  * @api public
  */
 
+'use strict';
+
 const msg = module.exports = exports = {};
 
 msg.DocumentNotFoundError = null;
diff --git a/lib/error/missingSchema.js b/lib/error/missingSchema.js
index a6a970be20..319515820f 100644
--- a/lib/error/missingSchema.js
+++ b/lib/error/missingSchema.js
@@ -3,6 +3,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseError = require('./');
 
 /*!
diff --git a/lib/error/mongooseError.js b/lib/error/mongooseError.js
index 322c4bcc38..398c31b7df 100644
--- a/lib/error/mongooseError.js
+++ b/lib/error/mongooseError.js
@@ -5,6 +5,8 @@
  * @inherits Error https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Error
  */
 
+'use strict';
+
 function MongooseError(msg) {
   Error.call(this);
   if (Error.captureStackTrace) {
diff --git a/lib/error/objectExpected.js b/lib/error/objectExpected.js
index 03ed57bd62..de54f4f3fd 100644
--- a/lib/error/objectExpected.js
+++ b/lib/error/objectExpected.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseError = require('./');
 
 /**
diff --git a/lib/error/objectParameter.js b/lib/error/objectParameter.js
index 5f5a456d18..3a7f2849cb 100644
--- a/lib/error/objectParameter.js
+++ b/lib/error/objectParameter.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseError = require('./');
 
 /**
diff --git a/lib/error/overwriteModel.js b/lib/error/overwriteModel.js
index 4d028f99e4..21013b65ec 100644
--- a/lib/error/overwriteModel.js
+++ b/lib/error/overwriteModel.js
@@ -3,6 +3,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseError = require('./');
 
 /*!
diff --git a/lib/error/strict.js b/lib/error/strict.js
index 1167f98c19..2678174768 100644
--- a/lib/error/strict.js
+++ b/lib/error/strict.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseError = require('./');
 
 /**
diff --git a/lib/error/validation.js b/lib/error/validation.js
index 7d26bc84de..85b733c48b 100644
--- a/lib/error/validation.js
+++ b/lib/error/validation.js
@@ -2,6 +2,8 @@
  * Module requirements
  */
 
+'use strict';
+
 const MongooseError = require('./');
 const util = require('util');
 
diff --git a/lib/error/validator.js b/lib/error/validator.js
index 5b6d1c1402..d07100c418 100644
--- a/lib/error/validator.js
+++ b/lib/error/validator.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const MongooseError = require('./');
 
 /**
diff --git a/lib/helpers/immediate.js b/lib/helpers/immediate.js
index e244b67c2e..ddb70607a1 100644
--- a/lib/helpers/immediate.js
+++ b/lib/helpers/immediate.js
@@ -5,6 +5,8 @@
  * See gh-6074
  */
 
+'use strict';
+
 module.exports = function immediate(cb) {
   return process.nextTick(cb);
 };
diff --git a/lib/internal.js b/lib/internal.js
index 0ec3dfed59..3205e8b4d3 100644
--- a/lib/internal.js
+++ b/lib/internal.js
@@ -2,6 +2,8 @@
  * Dependencies
  */
 
+'use strict';
+
 const StateMachine = require('./statemachine');
 const ActiveRoster = StateMachine.ctor('require', 'modify', 'init', 'default', 'ignore');
 
diff --git a/lib/promise_provider.js b/lib/promise_provider.js
index e6e9e27955..3febf36878 100644
--- a/lib/promise_provider.js
+++ b/lib/promise_provider.js
@@ -2,6 +2,8 @@
  * ignore
  */
 
+'use strict';
+
 const assert = require('assert');
 const mquery = require('mquery');
 
diff --git a/lib/schema/buffer.js b/lib/schema/buffer.js
index 57f44cbfe7..c0697392c9 100644
--- a/lib/schema/buffer.js
+++ b/lib/schema/buffer.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const handleBitwiseOperator = require('./operators/bitwise');
 const utils = require('../utils');
 
diff --git a/lib/schema/date.js b/lib/schema/date.js
index 1743bb7f71..d81cc79f1a 100644
--- a/lib/schema/date.js
+++ b/lib/schema/date.js
@@ -2,6 +2,8 @@
  * Module requirements.
  */
 
+'use strict';
+
 const MongooseError = require('../error');
 const utils = require('../utils');
 
diff --git a/lib/schema/decimal128.js b/lib/schema/decimal128.js
index 3aa5cd5b02..1139f77b69 100644
--- a/lib/schema/decimal128.js
+++ b/lib/schema/decimal128.js
@@ -4,6 +4,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const SchemaType = require('../schematype');
 const CastError = SchemaType.CastError;
 const Decimal128Type = require('../types/decimal128');
diff --git a/lib/schema/index.js b/lib/schema/index.js
index a34a3ad2b8..183a6e9846 100644
--- a/lib/schema/index.js
+++ b/lib/schema/index.js
@@ -3,6 +3,8 @@
  * Module exports.
  */
 
+'use strict';
+
 exports.String = require('./string');
 
 exports.Number = require('./number');
diff --git a/lib/schema/mixed.js b/lib/schema/mixed.js
index c86434c99e..2a8d703bd1 100644
--- a/lib/schema/mixed.js
+++ b/lib/schema/mixed.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const SchemaType = require('../schematype');
 const utils = require('../utils');
 
diff --git a/lib/schema/objectid.js b/lib/schema/objectid.js
index 91950aed2a..cb3c63117d 100644
--- a/lib/schema/objectid.js
+++ b/lib/schema/objectid.js
@@ -4,11 +4,9 @@
  * Module dependencies.
  */
 
-let SchemaType = require('../schematype'),
-    CastError = SchemaType.CastError,
-    oid = require('../types/objectid'),
-    utils = require('../utils'),
-    Document;
+'use strict';
+
+let SchemaType = require('../schematype'), CastError = SchemaType.CastError, oid = require('../types/objectid'), utils = require('../utils'), Document;
 
 /**
  * ObjectId SchemaType constructor.
diff --git a/lib/schema/operators/bitwise.js b/lib/schema/operators/bitwise.js
index 06b6d73290..07e18cd0cb 100644
--- a/lib/schema/operators/bitwise.js
+++ b/lib/schema/operators/bitwise.js
@@ -2,6 +2,8 @@
  * Module requirements.
  */
 
+'use strict';
+
 const CastError = require('../../error/cast');
 
 /*!
diff --git a/lib/schema/operators/geospatial.js b/lib/schema/operators/geospatial.js
index cd221f016d..1934561354 100644
--- a/lib/schema/operators/geospatial.js
+++ b/lib/schema/operators/geospatial.js
@@ -2,6 +2,8 @@
  * Module requirements.
  */
 
+'use strict';
+
 const castArraysOfNumbers = require('./helpers').castArraysOfNumbers;
 const castToNumber = require('./helpers').castToNumber;
 
diff --git a/lib/statemachine.js b/lib/statemachine.js
index 8ca9b6fb05..8036f5898f 100644
--- a/lib/statemachine.js
+++ b/lib/statemachine.js
@@ -3,6 +3,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const utils = require('./utils');
 
 /*!
diff --git a/lib/types/array.js b/lib/types/array.js
index c8be418cd4..74a1f55b48 100644
--- a/lib/types/array.js
+++ b/lib/types/array.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const EmbeddedDocument = require('./embedded');
 const Document = require('../document');
 const ObjectId = require('./objectid');
diff --git a/lib/types/buffer.js b/lib/types/buffer.js
index 51e564d6d9..d0a938b8f0 100644
--- a/lib/types/buffer.js
+++ b/lib/types/buffer.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const Binary = require('../driver').get().Binary;
 const utils = require('../utils');
 const Buffer = require('safe-buffer').Buffer;
@@ -169,14 +171,13 @@ MongooseBuffer.mixin = {
 
 (
 // node < 0.5
-  'writeUInt8 writeUInt16 writeUInt32 writeInt8 writeInt16 writeInt32 ' +
+  ('writeUInt8 writeUInt16 writeUInt32 writeInt8 writeInt16 writeInt32 ' +
     'writeFloat writeDouble fill ' +
     'utf8Write binaryWrite asciiWrite set ' +
 
   // node >= 0.5
     'writeUInt16LE writeUInt16BE writeUInt32LE writeUInt32BE ' +
-    'writeInt16LE writeInt16BE writeInt32LE writeInt32BE ' +
-    'writeFloatLE writeFloatBE writeDoubleLE writeDoubleBE'
+    'writeInt16LE writeInt16BE writeInt32LE writeInt32BE ' + 'writeFloatLE writeFloatBE writeDoubleLE writeDoubleBE')
 ).split(' ').forEach(function(method) {
   if (!Buffer.prototype[method]) {
     return;
diff --git a/lib/types/decimal128.js b/lib/types/decimal128.js
index 7b4bbd2115..f0bae2a131 100644
--- a/lib/types/decimal128.js
+++ b/lib/types/decimal128.js
@@ -8,4 +8,6 @@
  * @constructor ObjectId
  */
 
+'use strict';
+
 module.exports = require('../driver').get().Decimal128;
diff --git a/lib/types/embedded.js b/lib/types/embedded.js
index 5b151ceb00..961d045d6d 100644
--- a/lib/types/embedded.js
+++ b/lib/types/embedded.js
@@ -4,6 +4,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const Document = require('../document_provider')();
 const EventEmitter = require('events').EventEmitter;
 const immediate = require('../helpers/immediate');
diff --git a/lib/types/index.js b/lib/types/index.js
index f340ddb1d5..a1945a03d1 100644
--- a/lib/types/index.js
+++ b/lib/types/index.js
@@ -3,6 +3,8 @@
  * Module exports.
  */
 
+'use strict';
+
 exports.Array = require('./array');
 exports.Buffer = require('./buffer');
 
diff --git a/lib/types/objectid.js b/lib/types/objectid.js
index 0b01eb1aa9..cbe9bd8b06 100644
--- a/lib/types/objectid.js
+++ b/lib/types/objectid.js
@@ -8,6 +8,8 @@
  * @constructor ObjectId
  */
 
+'use strict';
+
 const ObjectId = require('../driver').get().ObjectId;
 
 /*!
diff --git a/lib/virtualtype.js b/lib/virtualtype.js
index 3924261e22..36b519556c 100644
--- a/lib/virtualtype.js
+++ b/lib/virtualtype.js
@@ -17,6 +17,8 @@
  * @api public
  */
 
+'use strict';
+
 function VirtualType(options, name) {
   this.path = name;
   this.getters = [];
diff --git a/package.json b/package.json
index cdc1f50103..d1fad368b0 100644
--- a/package.json
+++ b/package.json
@@ -130,7 +130,11 @@
       "space-infix-ops": "error",
       "space-unary-ops": "error",
       "no-var": "warn",
-      "prefer-const": "warn"
+      "prefer-const": "warn",
+      "strict": [
+        "error",
+        "global"
+      ]
     }
   }
 }
diff --git a/static.js b/static.js
index cf1129fe63..940170b2c0 100644
--- a/static.js
+++ b/static.js
@@ -1,5 +1,7 @@
-const static = require('node-static');
-const server = new static.Server('.', {cache: 0});
+'use strict';
+
+const nodeStatic = require('node-static');
+const server = new nodeStatic.Server('.', {cache: 0});
 
 require('http').createServer(function(req, res) {
   if (req.url === '/favicon.ico') {
diff --git a/test/cast.test.js b/test/cast.test.js
index 9326362680..836dd4f36a 100644
--- a/test/cast.test.js
+++ b/test/cast.test.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const Schema = require('../lib/schema');
 const assert = require('power-assert');
 const cast = require('../lib/cast');
diff --git a/test/collection.capped.test.js b/test/collection.capped.test.js
index dc1158af1a..961440ea6c 100644
--- a/test/collection.capped.test.js
+++ b/test/collection.capped.test.js
@@ -2,11 +2,9 @@
  * Module dependencies.
  */
 
-let start = require('./common'),
-    mongoose = start.mongoose,
-    assert = require('power-assert'),
-    Schema = mongoose.Schema,
-    random = require('../lib/utils').random;
+'use strict';
+
+let start = require('./common'), mongoose = start.mongoose, assert = require('power-assert'), Schema = mongoose.Schema, random = require('../lib/utils').random;
 
 /**
  * setup
diff --git a/test/colors.js b/test/colors.js
index 7673aeed92..dc4a295de5 100644
--- a/test/colors.js
+++ b/test/colors.js
@@ -2,13 +2,9 @@
  * Module dependencies.
  */
 
-let start = require('./common'),
-    mongoose = start.mongoose,
-    assert = require('power-assert'),
-    Schema = mongoose.Schema,
-    MongooseDocumentArray = mongoose.Types.DocumentArray,
-    EmbeddedDocument = require('../lib/types/embedded'),
-    DocumentArray = require('../lib/types/documentarray');
+'use strict';
+
+let start = require('./common'), mongoose = start.mongoose, assert = require('power-assert'), Schema = mongoose.Schema, MongooseDocumentArray = mongoose.Types.DocumentArray, EmbeddedDocument = require('../lib/types/embedded'), DocumentArray = require('../lib/types/documentarray');
 
 /**
  * setup
diff --git a/test/docs/promises.test.js b/test/docs/promises.test.js
index a41894ba15..cc69caf4b8 100644
--- a/test/docs/promises.test.js
+++ b/test/docs/promises.test.js
@@ -1,3 +1,4 @@
+'use strict';
 var PromiseProvider = require('../../lib/promise_provider');
 var assert = require('power-assert');
 var mongoose = require('../../');
diff --git a/test/docs/schematypes.test.js b/test/docs/schematypes.test.js
index 28834d9d31..92a4fe0a9c 100644
--- a/test/docs/schematypes.test.js
+++ b/test/docs/schematypes.test.js
@@ -1,3 +1,4 @@
+'use strict';
 var assert = require('assert');
 var mongoose = require('../../');
 
diff --git a/test/docs/validation.test.js b/test/docs/validation.test.js
index 3c0dde4bcc..55e5ad51db 100644
--- a/test/docs/validation.test.js
+++ b/test/docs/validation.test.js
@@ -1,3 +1,4 @@
+'use strict';
 var assert = require('assert');
 var mongoose = require('../../');
 
diff --git a/test/document.isselected.test.js b/test/document.isselected.test.js
index 6ad79cac82..5a92e3cc68 100644
--- a/test/document.isselected.test.js
+++ b/test/document.isselected.test.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const start = require('./common');
 const mongoose = start.mongoose;
 const assert = require('power-assert');
diff --git a/test/document.modified.test.js b/test/document.modified.test.js
index 8ae9b79e87..6c2e0fe48b 100644
--- a/test/document.modified.test.js
+++ b/test/document.modified.test.js
@@ -2,13 +2,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = start.mongoose,
-    random = require('../lib/utils').random,
-    Schema = mongoose.Schema,
-    ObjectId = Schema.ObjectId,
-    DocumentObjectId = mongoose.Types.ObjectId;
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = start.mongoose, random = require('../lib/utils').random, Schema = mongoose.Schema, ObjectId = Schema.ObjectId, DocumentObjectId = mongoose.Types.ObjectId;
 
 /**
  * Setup.
diff --git a/test/document.populate.test.js b/test/document.populate.test.js
index 19ffb0cec9..ffb30c89fd 100644
--- a/test/document.populate.test.js
+++ b/test/document.populate.test.js
@@ -3,14 +3,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = start.mongoose,
-    utils = require('../lib/utils'),
-    random = utils.random,
-    Schema = mongoose.Schema,
-    ObjectId = Schema.ObjectId,
-    Document = require('../lib/document');
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = start.mongoose, utils = require('../lib/utils'), random = utils.random, Schema = mongoose.Schema, ObjectId = Schema.ObjectId, Document = require('../lib/document');
 
 /**
  * Setup.
diff --git a/test/document.strict.test.js b/test/document.strict.test.js
index 1e35759d8b..22e4502dda 100644
--- a/test/document.strict.test.js
+++ b/test/document.strict.test.js
@@ -2,11 +2,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    mongoose = start.mongoose,
-    assert = require('power-assert'),
-    random = require('../lib/utils').random,
-    Schema = mongoose.Schema;
+'use strict';
+
+let start = require('./common'), mongoose = start.mongoose, assert = require('power-assert'), random = require('../lib/utils').random, Schema = mongoose.Schema;
 
 describe('document: strict mode:', function() {
   let db;
diff --git a/test/document.unit.test.js b/test/document.unit.test.js
index c70b638ea6..484d2c59a9 100644
--- a/test/document.unit.test.js
+++ b/test/document.unit.test.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const assert = require('power-assert');
 const start = require('./common');
 const storeShard = require('../lib/plugins/sharding').storeShard;
diff --git a/test/errors.validation.test.js b/test/errors.validation.test.js
index 6f2ee74afb..bc6e867165 100644
--- a/test/errors.validation.test.js
+++ b/test/errors.validation.test.js
@@ -3,6 +3,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const assert = require('power-assert');
 const start = require('./common');
 const mongoose = start.mongoose;
diff --git a/test/files/sample.js b/test/files/sample.js
index 174fd1d820..c6394c6ebc 100644
--- a/test/files/sample.js
+++ b/test/files/sample.js
@@ -1,3 +1,4 @@
+'use strict';
 import mongoose from '../../browser.js';
 
 const doc = new mongoose.Document({}, new mongoose.Schema({
diff --git a/test/gh-1408.test.js b/test/gh-1408.test.js
index f1d3d1bde6..c042cb2fe5 100644
--- a/test/gh-1408.test.js
+++ b/test/gh-1408.test.js
@@ -3,10 +3,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = start.mongoose,
-    Schema = mongoose.Schema;
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = start.mongoose, Schema = mongoose.Schema;
 
 describe('documents should not be converted to _id (gh-1408)', function() {
   it('if an embedded doc', function(done) {
diff --git a/test/model.aggregate.test.js b/test/model.aggregate.test.js
index f1830bf66b..b740c40b49 100644
--- a/test/model.aggregate.test.js
+++ b/test/model.aggregate.test.js
@@ -3,6 +3,8 @@
  * Test dependencies.
  */
 
+'use strict';
+
 const Aggregate = require('../lib/aggregate');
 const assert = require('assert');
 const random = require('../lib/utils').random;
diff --git a/test/model.discriminator.querying.test.js b/test/model.discriminator.querying.test.js
index 97e553aeff..7b9d6cfa48 100644
--- a/test/model.discriminator.querying.test.js
+++ b/test/model.discriminator.querying.test.js
@@ -2,6 +2,8 @@
  * Test dependencies.
  */
 
+'use strict';
+
 const start = require('./common');
 const mongoose = start.mongoose;
 const Schema = mongoose.Schema;
diff --git a/test/model.field.selection.test.js b/test/model.field.selection.test.js
index 87bd765ca9..9acb6d547e 100644
--- a/test/model.field.selection.test.js
+++ b/test/model.field.selection.test.js
@@ -2,13 +2,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = start.mongoose,
-    random = require('../lib/utils').random,
-    Schema = mongoose.Schema,
-    ObjectId = Schema.Types.ObjectId,
-    DocumentObjectId = mongoose.Types.ObjectId;
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = start.mongoose, random = require('../lib/utils').random, Schema = mongoose.Schema, ObjectId = Schema.Types.ObjectId, DocumentObjectId = mongoose.Types.ObjectId;
 
 describe('model field selection', function() {
   let Comments;
diff --git a/test/model.geosearch.test.js b/test/model.geosearch.test.js
index 0af5ae5f2d..ebe3857022 100644
--- a/test/model.geosearch.test.js
+++ b/test/model.geosearch.test.js
@@ -1,4 +1,5 @@
 
+'use strict';
 let start = require('./common'),
     assert = require('power-assert'),
     mongoose = start.mongoose,
diff --git a/test/model.hydrate.test.js b/test/model.hydrate.test.js
index f1c32a8fcd..19041d329c 100644
--- a/test/model.hydrate.test.js
+++ b/test/model.hydrate.test.js
@@ -2,11 +2,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = start.mongoose,
-    Schema = mongoose.Schema,
-    DocumentObjectId = mongoose.Types.ObjectId;
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = start.mongoose, Schema = mongoose.Schema, DocumentObjectId = mongoose.Types.ObjectId;
 
 describe('model', function() {
   let schemaB;
diff --git a/test/model.mapreduce.test.js b/test/model.mapreduce.test.js
index 1b8e567fb5..2c481dc775 100644
--- a/test/model.mapreduce.test.js
+++ b/test/model.mapreduce.test.js
@@ -3,12 +3,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    mongoose = start.mongoose,
-    assert = require('power-assert'),
-    random = require('../lib/utils').random,
-    Schema = mongoose.Schema,
-    ObjectId = Schema.Types.ObjectId;
+'use strict';
+
+let start = require('./common'), mongoose = start.mongoose, assert = require('power-assert'), random = require('../lib/utils').random, Schema = mongoose.Schema, ObjectId = Schema.Types.ObjectId;
 
 describe('model: mapreduce:', function() {
   let Comments;
diff --git a/test/model.populate.divergent.test.js b/test/model.populate.divergent.test.js
index 1bba2e0db9..a0b3ca7387 100644
--- a/test/model.populate.divergent.test.js
+++ b/test/model.populate.divergent.test.js
@@ -3,12 +3,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = start.mongoose,
-    DivergentArrayError = mongoose.Error.DivergentArrayError,
-    utils = require('../lib/utils'),
-    random = utils.random;
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = start.mongoose, DivergentArrayError = mongoose.Error.DivergentArrayError, utils = require('../lib/utils'), random = utils.random;
 
 /**
  * Tests.
diff --git a/test/model.populate.setting.test.js b/test/model.populate.setting.test.js
index 349c30dcf8..7cb63b72d3 100644
--- a/test/model.populate.setting.test.js
+++ b/test/model.populate.setting.test.js
@@ -4,14 +4,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = start.mongoose,
-    utils = require('../lib/utils'),
-    random = utils.random,
-    Schema = mongoose.Schema,
-    DocObjectId = mongoose.Types.ObjectId,
-    Buffer = require('safe-buffer').Buffer;
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = start.mongoose, utils = require('../lib/utils'), random = utils.random, Schema = mongoose.Schema, DocObjectId = mongoose.Types.ObjectId, Buffer = require('safe-buffer').Buffer;
 
 /**
  * Setup.
diff --git a/test/model.translateAliases.test.js b/test/model.translateAliases.test.js
index 83a5ca414e..8056e95b4a 100644
--- a/test/model.translateAliases.test.js
+++ b/test/model.translateAliases.test.js
@@ -2,9 +2,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = start.mongoose;
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = start.mongoose;
 
 describe('model translate aliases', function() {
   it('should translate correctly', function() {
diff --git a/test/object.create.null.test.js b/test/object.create.null.test.js
index 0c3328bab2..35ebcbf0d7 100644
--- a/test/object.create.null.test.js
+++ b/test/object.create.null.test.js
@@ -2,10 +2,9 @@
  * Test dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = start.mongoose,
-    Schema = mongoose.Schema;
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = start.mongoose, Schema = mongoose.Schema;
 
 let schema;
 
diff --git a/test/query.cursor.test.js b/test/query.cursor.test.js
index 71d4023b87..a1c4752aec 100644
--- a/test/query.cursor.test.js
+++ b/test/query.cursor.test.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const assert = require('assert');
 const start = require('./common');
 
diff --git a/test/query.middleware.test.js b/test/query.middleware.test.js
index 274d5c2650..472c388f58 100644
--- a/test/query.middleware.test.js
+++ b/test/query.middleware.test.js
@@ -1,3 +1,4 @@
+'use strict';
 const start = require('./common');
 const assert = require('power-assert');
 const mongoose = start.mongoose;
diff --git a/test/schema.boolean.test.js b/test/schema.boolean.test.js
index 862b451d07..358eb4a4e0 100644
--- a/test/schema.boolean.test.js
+++ b/test/schema.boolean.test.js
@@ -3,10 +3,9 @@
  * Module dependencies.
  */
 
-let start = require('./common'),
-    mongoose = start.mongoose,
-    assert = require('power-assert'),
-    Schema = mongoose.Schema;
+'use strict';
+
+let start = require('./common'), mongoose = start.mongoose, assert = require('power-assert'), Schema = mongoose.Schema;
 
 describe('schematype', function() {
   let db;
diff --git a/test/schema.date.test.js b/test/schema.date.test.js
index dc62afedb9..0c2fb1a034 100644
--- a/test/schema.date.test.js
+++ b/test/schema.date.test.js
@@ -1,3 +1,4 @@
+'use strict';
 let start = require('./common'),
     mongoose = start.mongoose,
     assert = require('power-assert'),
diff --git a/test/schema.documentarray.test.js b/test/schema.documentarray.test.js
index 5612726d14..978b5bc4e2 100644
--- a/test/schema.documentarray.test.js
+++ b/test/schema.documentarray.test.js
@@ -2,10 +2,9 @@
  * Module dependencies.
  */
 
-let start = require('./common'),
-    mongoose = start.mongoose,
-    assert = require('power-assert'),
-    Schema = mongoose.Schema;
+'use strict';
+
+let start = require('./common'), mongoose = start.mongoose, assert = require('power-assert'), Schema = mongoose.Schema;
 
 /**
  * Test.
diff --git a/test/schema.mixed.test.js b/test/schema.mixed.test.js
index 9fb2de9b72..f762809c1f 100644
--- a/test/schema.mixed.test.js
+++ b/test/schema.mixed.test.js
@@ -3,10 +3,9 @@
  * Module dependencies.
  */
 
-let start = require('./common'),
-    mongoose = new start.mongoose.Mongoose,
-    assert = require('power-assert'),
-    Schema = mongoose.Schema;
+'use strict';
+
+let start = require('./common'), mongoose = new start.mongoose.Mongoose, assert = require('power-assert'), Schema = mongoose.Schema;
 
 describe('schematype mixed', function() {
   describe('empty object defaults (gh-1380)', function() {
diff --git a/test/schema.onthefly.test.js b/test/schema.onthefly.test.js
index 30e6f81544..b3f455febc 100644
--- a/test/schema.onthefly.test.js
+++ b/test/schema.onthefly.test.js
@@ -1,3 +1,4 @@
+'use strict';
 let start = require('./common'),
     assert = require('power-assert'),
     mongoose = start.mongoose,
diff --git a/test/schema.type.test.js b/test/schema.type.test.js
index f357b8d1ad..8d3611abca 100644
--- a/test/schema.type.test.js
+++ b/test/schema.type.test.js
@@ -3,9 +3,9 @@
  * Module dependencies.
  */
 
-let mongoose = require('./common').mongoose,
-    assert = require('power-assert'),
-    Schema = mongoose.Schema;
+'use strict';
+
+let mongoose = require('./common').mongoose, assert = require('power-assert'), Schema = mongoose.Schema;
 
 describe('schematype', function() {
   it('honors the selected option', function(done) {
diff --git a/test/shard.test.js b/test/shard.test.js
index f29d71dac9..f9c3525b36 100644
--- a/test/shard.test.js
+++ b/test/shard.test.js
@@ -1,3 +1,5 @@
+/* eslint strict: 0 */
+
 let start = require('./common'),
     assert = require('power-assert'),
     random = require('../lib/utils').random,
diff --git a/test/types.array.test.js b/test/types.array.test.js
index 972d3c6683..0f0135e219 100644
--- a/test/types.array.test.js
+++ b/test/types.array.test.js
@@ -2,6 +2,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const start = require('./common');
 const assert = require('power-assert');
 const mongoose = require('./common').mongoose;
diff --git a/test/types.buffer.test.js b/test/types.buffer.test.js
index e311f69596..a7a15028a4 100644
--- a/test/types.buffer.test.js
+++ b/test/types.buffer.test.js
@@ -2,13 +2,9 @@
  * Module dependencies.
  */
 
-let start = require('./common'),
-    assert = require('power-assert'),
-    mongoose = require('./common').mongoose,
-    Schema = mongoose.Schema,
-    random = require('../lib/utils').random,
-    MongooseBuffer = mongoose.Types.Buffer,
-    Buffer = require('safe-buffer').Buffer;
+'use strict';
+
+let start = require('./common'), assert = require('power-assert'), mongoose = require('./common').mongoose, Schema = mongoose.Schema, random = require('../lib/utils').random, MongooseBuffer = mongoose.Types.Buffer, Buffer = require('safe-buffer').Buffer;
 
 function valid(v) {
   return !v || v.length > 10;
diff --git a/test/types.document.test.js b/test/types.document.test.js
index f13615694c..1beeba5da6 100644
--- a/test/types.document.test.js
+++ b/test/types.document.test.js
@@ -3,6 +3,8 @@
  * Module dependencies.
  */
 
+'use strict';
+
 const assert = require('power-assert');
 const start = require('./common');
 const mongoose = start.mongoose;
diff --git a/test/types.embeddeddocument.test.js b/test/types.embeddeddocument.test.js
index 2934087d22..0ac0569865 100644
--- a/test/types.embeddeddocument.test.js
+++ b/test/types.embeddeddocument.test.js
@@ -3,10 +3,9 @@
  * Module dependencies.
  */
 
-let assert = require('power-assert'),
-    start = require('./common'),
-    mongoose = start.mongoose,
-    Schema = mongoose.Schema;
+'use strict';
+
+let assert = require('power-assert'), start = require('./common'), mongoose = start.mongoose, Schema = mongoose.Schema;
 
 /**
  * Test.
diff --git a/test/types.number.test.js b/test/types.number.test.js
index 547ec334ab..bc00c8f51d 100644
--- a/test/types.number.test.js
+++ b/test/types.number.test.js
@@ -3,9 +3,9 @@
  * Module dependencies.
  */
 
-let mongoose = require('./common').mongoose,
-    SchemaNumber = mongoose.Schema.Types.Number,
-    assert = require('power-assert');
+'use strict';
+
+let mongoose = require('./common').mongoose, SchemaNumber = mongoose.Schema.Types.Number, assert = require('power-assert');
 
 /**
  * Test.
diff --git a/test/types.subdocument.test.js b/test/types.subdocument.test.js
index 592a354b26..27055d64c2 100644
--- a/test/types.subdocument.test.js
+++ b/test/types.subdocument.test.js
@@ -3,10 +3,9 @@
  * Module dependencies.
  */
 
-let assert = require('power-assert'),
-    start = require('./common'),
-    mongoose = start.mongoose,
-    Schema = mongoose.Schema;
+'use strict';
+
+let assert = require('power-assert'), start = require('./common'), mongoose = start.mongoose, Schema = mongoose.Schema;
 
 /**
  * Test.
diff --git a/test/updateValidators.unit.test.js b/test/updateValidators.unit.test.js
index eeefee3c40..a7187ff2b0 100644
--- a/test/updateValidators.unit.test.js
+++ b/test/updateValidators.unit.test.js
@@ -1,3 +1,4 @@
+'use strict';
 const assert = require('power-assert');
 const updateValidators = require('../lib/helpers/updateValidators');
 const emitter = require('events').EventEmitter;
diff --git a/test/utils.test.js b/test/utils.test.js
index 0390ebaf85..c8907f0107 100644
--- a/test/utils.test.js
+++ b/test/utils.test.js
@@ -3,15 +3,9 @@
  * Module dependencies.
  */
 
-let start = require('./common'),
-    mongoose = start.mongoose,
-    Schema = mongoose.Schema,
-    utils = require('../lib/utils'),
-    StateMachine = require('../lib/statemachine'),
-    ObjectId = require('../lib/types/objectid'),
-    MongooseBuffer = require('../lib/types/buffer'),
-    Buffer = require('safe-buffer').Buffer,
-    assert = require('power-assert');
+'use strict';
+
+let start = require('./common'), mongoose = start.mongoose, Schema = mongoose.Schema, utils = require('../lib/utils'), StateMachine = require('../lib/statemachine'), ObjectId = require('../lib/types/objectid'), MongooseBuffer = require('../lib/types/buffer'), Buffer = require('safe-buffer').Buffer, assert = require('power-assert');
 
 /**
  * Setup.