enforce strictness tests

.eslintrc.json

@@ -2,8 +2,9 @@
   "extends": "eslint:recommended",
   "ecmaVersion": 6,
   "rules": {
-    "no-console": 0,
-    "no-var": "error"
+    "no-console": "off",
+    "no-var": "error",
+    "strict": "error"
   },
   "env": {
     "browser": true,

lib/elements/array-selector.html

@@ -14,6 +14,7 @@
 
 <script>
 (function() {
+  'use strict';
 
   /**
    * Element mixin for recording  dynamic associations between item paths in a

lib/elements/dom-bind.html

@@ -14,6 +14,7 @@
 <script>
 
   (function() {
+    'use strict';
 
     const domBindBase = Polymer.OptionalMutableData(Polymer.PropertyEffects(HTMLElement));
 

lib/elements/dom-if.html

@@ -16,6 +16,7 @@
 <script>
 
 (function() {
+  'use strict';
 
   /**
    * The `<dom-if>` element will stamp a light-dom `<template>` child when

lib/elements/dom-module.html

@@ -1,3 +1,12 @@
+<!--
+@license
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
 <link rel="import" href="../utils/boot.html">
 <link rel="import" href="../utils/resolve-url.html">
 <script>

lib/legacy/mutable-data-behavior.html

@@ -12,6 +12,7 @@
 
 <script>
 (function() {
+  'use strict';
 
   let mutablePropertyChange = Polymer.MutableData._mutablePropertyChange;
 

lib/legacy/polymer-fn.html

@@ -13,6 +13,7 @@
 <script>
 
   (function() {
+    'use strict';
 
     /**
      * Legacy class factory and registration helper for defining Polymer

lib/legacy/polymer.dom.html

@@ -12,6 +12,7 @@
 <link rel="import" href="../utils/flush.html">
 <script>
 (function() {
+  'use strict';
 
   const p = Element.prototype;
   const normalizedMatchesSelector = p.matches || p.matchesSelector ||

lib/mixins/element-mixin.html

@@ -18,6 +18,7 @@
 
 <script>
 (function() {
+  'use strict';
   /**
    * @typedef Object<string, {
    *   value: *,

lib/mixins/mutable-data.html

@@ -10,6 +10,7 @@
 
 <script>
 (function() {
+  'use strict';
 
   // Common implementation for mixin & behavior
   function mutablePropertyChange(inst, property, value, old, mutableData) {

lib/utils/boot.html

@@ -9,6 +9,7 @@
 -->
 <script>
 (function() {
+  'use strict';
 
   const userPolymer = window.Polymer;
 

lib/utils/case-map.html

@@ -10,6 +10,7 @@
 <link rel="import" href="boot.html">
 <script>
 (function() {
+  'use strict';
 
   const caseMap = {};
   const DASH_TO_CAMEL = /-[a-z]/g;

lib/utils/flattened-nodes-observer.html

@@ -12,6 +12,7 @@
 <link rel="import" href="../utils/async.html">
 <script>
 (function() {
+  'use strict';
 
   function isSlot(node) {
     return (node.localName === 'slot');

lib/utils/flush.html

@@ -10,6 +10,7 @@
 <link rel="import" href="boot.html">
 <script>
 (function() {
+  'use strict';
 
   let debouncerQueue = [];
 

lib/utils/path.html

@@ -12,6 +12,7 @@
 
 <script>
 (function() {
+  'use strict';
 
   /**
    * Module with utilities for manipulating structured data path strings.

lib/utils/resolve-url.html

@@ -12,6 +12,7 @@
 <script>
 
   (function() {
+    'use strict';
 
     let CSS_URL_RX = /(url\()([^)]*)(\))/g;
     let ABS_URL = /(^\/)|(^#)|(^[\w-\d]*:)/;

lib/utils/unresolved.html

@@ -9,6 +9,7 @@
 -->
 <script>
 (function() {
+  'use strict';
 
   // unresolved
 

test/.eslintrc.json

@@ -3,7 +3,8 @@
     "mocha": true
   },
   "rules": {
-    "no-var": "off"
+    "no-var": "off",
+    "strict": "off"
   },
   "globals": {
     "assert": true,