Infrastructure: Add eslint rules from eslint:recommended config (pull #1207)

Perdiscussion in issue #1180, ad the eslint:recommended shareable config to eslint.
Then fix errors.

* chore: switch to eslint:recommended
* chore: eslint fix with new config
* fix: no-const-assign
* fix: no-empty
* fix: no-useless-escape
* fix: no-duplicate-case
* fix: no-constant-condition
* fix: no-unsafe-negation
* chore: ignore no-cond-assign
* fix: no-redeclare
* Option collides with built-in type
* fix: no-prototype-builtins
* chore: ignore currently failing rules

Author: nschonni

.eslintrc.json

@@ -1,109 +1,11 @@
 {
+  "extends": "eslint:recommended",
+  "env": {
+    "browser": true
+  },
   "rules": {
-    "no-with": 2,
-    "no-mixed-spaces-and-tabs": 2,
-    "no-multiple-empty-lines": 2,
-    "no-multi-spaces": 0,
-    "operator-linebreak": [
-      2,
-      "after"
-    ],
-    "quote-props": 0,
-    "key-spacing": [
-      2,
-      {
-        "afterColon": true
-      }
-    ],
-    "space-unary-ops": [
-      2,
-      {
-        "words": false,
-        "nonwords": false
-      }
-    ],
-    "no-spaced-func": 2,
-    "array-bracket-spacing": [
-      2,
-      "never",
-      {
-        "singleValue": true
-      }
-    ],
-    "space-in-parens": [
-      2,
-      "never"
-    ],
-    "comma-dangle": [
-      2,
-      "never"
-    ],
-    "no-trailing-spaces": 2,
-    "yoda": [
-      2,
-      "never"
-    ],
-    "camelcase": [
-      2,
-      {
-        "properties": "always"
-      }
-    ],
-    "comma-style": [
-      2,
-      "last"
-    ],
-    "curly": [
-      2,
-      "all"
-    ],
-    "dot-notation": 2,
-    "brace-style": [
-      2,
-      "stroustrup",
-      {
-        "allowSingleLine": true
-      }
-    ],
-    "eol-last": 2,
-    "wrap-iife": 2,
-    "semi": [
-      2,
-      "always"
-    ],
-    "space-infix-ops": 2,
-    "keyword-spacing": [
-      2,
-      {}
-    ],
-    "spaced-comment": [
-      2,
-      "always"
-    ],
-    "space-before-blocks": [
-      2,
-      "always"
-    ],
-    "space-before-function-paren": [
-      2,
-      "always"
-    ],
-    "consistent-this": [
-      2,
-      "self"
-    ],
-    "indent": [
-      2,
-      2,
-      {
-        "SwitchCase": 1
-      }
-    ],
-    "quotes": [
-      2,
-      "single"
-    ],
-    "no-eval": "error",
-    "no-implied-eval": "error"
+    "no-unused-vars": 0,
+    "no-undef": 0,
+    "no-fallthrough": 0
   }
 }

examples/combobox/aria1.0pattern/js/listbox.js

@@ -7,7 +7,7 @@ var Listbox = function (domNode, comboboxObj) {
     msgPrefix = 'Listbox constructor argument domNode ';
 
   // Check whether domNode is a DOM element
-  if (!domNode instanceof Element) {
+  if (!(domNode instanceof Element)) {
     throw new TypeError(msgPrefix + 'is not a DOM Element.');
   }
 
@@ -65,7 +65,7 @@ Listbox.prototype.init = function () {
     optionElement = optionElements[i];
 
     if (!optionElement.firstElementChild && optionElement.getAttribute('role') != 'separator') {
-      option = new Option(optionElement, this);
+      option = new ListboxOption(optionElement, this);
       option.init();
       this.allOptions.push(option);
     }

examples/combobox/aria1.0pattern/js/listboxOption.js

@@ -2,7 +2,7 @@
 *   This content is licensed according to the W3C Software License at
 *   https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document
 */
-var Option = function (domNode, listboxObj) {
+var ListboxOption = function (domNode, listboxObj) {
 
   this.domNode = domNode;
   this.listbox = listboxObj;
@@ -11,7 +11,7 @@ var Option = function (domNode, listboxObj) {
 
 };
 
-Option.prototype.init = function () {
+ListboxOption.prototype.init = function () {
 
   if (!this.domNode.getAttribute('role')) {
     this.domNode.setAttribute('role', 'option');
@@ -25,18 +25,18 @@ Option.prototype.init = function () {
 
 /* EVENT HANDLERS */
 
-Option.prototype.handleClick = function (event) {
+ListboxOption.prototype.handleClick = function (event) {
   this.listbox.setOption(this);
   this.listbox.close(true);
 };
 
-Option.prototype.handleMouseover = function (event) {
+ListboxOption.prototype.handleMouseover = function (event) {
   this.listbox.hasHover = true;
   this.listbox.open();
 
 };
 
-Option.prototype.handleMouseout = function (event) {
+ListboxOption.prototype.handleMouseout = function (event) {
   this.listbox.hasHover = false;
   setTimeout(this.listbox.close.bind(this.listbox, false), 300);
 };

examples/dialog-modal/js/dialog.js

@@ -70,6 +70,7 @@ aria.Utils = aria.Utils || {};
       element.focus();
     }
     catch (e) {
+      // continue regardless of error
     }
     aria.Utils.IgnoreUtilFocusChanges = false;
     return (document.activeElement === element);