MDL-54944 eslint: Add rules from Policy decision

Also bump eslint to v2.13.1 and make the version explicit in
package.json

.eslintrc

@@ -9,10 +9,10 @@
   },
   'rules': {
     // See http://eslint.org/docs/rules/ for all rules and explanations of all
-    // rules. Commented out rules with 'DEFINE POLICY' are rules Dan P has flagged
-    // for discussion and possible enable soon.
+    // rules.
+
     // === Possible Errors ===
-    // DEFINE POLICY: 'comma-dangle': ['off', 'always'],
+    'comma-dangle': 'off',
     'no-cond-assign': 'error',
     'no-console': 'error',
     'no-constant-condition': 'error',
@@ -21,7 +21,7 @@
     'no-dupe-args': 'error',
     'no-dupe-keys': 'error',
     'no-duplicate-case': 'error',
-    // Disabled for YUI rollups, enabled by grunt for AMD: 'no-empty': 'error',
+    'no-empty': 'warn',
     'no-empty-character-class': 'error',
     'no-ex-assign': 'error',
     'no-extra-boolean-cast': 'error',
@@ -45,18 +45,25 @@
 
     // === Best Practices ===
     // (these mostly match our jshint config)
+    'array-callback-return': 'warn',
+    'block-scoped-var': 'warn',
+    'complexity': 'warn',
+    'consistent-return': 'warn',
     'curly': 'error',
     'dot-notation': 'warn',
     'no-alert': 'warn',
     'no-caller': 'error',
     'no-case-declarations': 'error',
+    'no-div-regex': 'error',
     'no-empty-pattern': 'error',
     'no-empty-function': 'warn',
-    //DEFINE POLICY: 'no-eq-null': 'warn',
+    'no-eq-null': 'error',
     'no-eval': 'error',
-    //DEFINE POLICY: 'no-extra-bind': 'warn',
+    'no-extend-native': 'error',
+    'no-extra-bind': 'warn',
     'no-fallthrough': 'error',
-    //DEFINE POLICY: 'no-implicit-globals': 'warn',
+    'no-floating-decimal': 'warn',
+    // Disabled for YUI rollups, enabled by grunt for AMD: 'no-implicit-globals': 'warn',
     'no-implied-eval': 'error',
     'no-invalid-this': 'error',
     'no-iterator': 'error',
@@ -67,26 +74,28 @@
     'no-native-reassign': 'warn',
     'no-new-func': 'error',
     'no-new-wrappers': 'error',
-    // DEFINE POLICY: no-octal: "error"
-    // DEFINE POLICY: no-octal-escape: "error"
+    'no-octal': 'error',
+    'no-octal-escape': 'error',
     'no-proto': 'error',
     'no-redeclare': 'warn',
     'no-return-assign': 'error',
     'no-script-url': 'error',
     'no-self-assign': 'error',
     'no-self-compare': 'error',
+    'no-sequences': 'warn',
+    'no-throw-literal': 'warn',
     'no-unmodified-loop-condition': 'error',
     // Disabled for YUI rollups, enabled by grunt for AMD: 'no-unused-expressions': 'error',
     'no-unused-labels': 'error',
-    //DEFINE POLICY: 'no-useless-call': 'error',
+    'no-useless-call': 'warn',
     'no-useless-escape': 'warn',
-    //DEFINE POLICY: 'no-with': 'error',
+    'no-with': 'error',
     'wrap-iife': ['error', 'any'],
 
     // === Variables ===
     'no-delete-var': 'error',
     // Disabled for YUI rollups, enabled by grunt for AMD: 'no-undef': 'off',
-    //DEFINE POLICY: 'no-undef-init': 'error',
+    'no-undef-init': 'error',
     // Disabled for YUI rollups, enabled by grunt for AMD: 'no-unused-vars': 'error',
 
     // === Stylistic Issues ===
@@ -109,17 +118,16 @@
     'lines-around-comment': 'off',
     'max-len': ['error', 132],
     'max-lines': 'off',
-    // DEFINE POLICY: turn on some of these max values?
-    'max-depth': 'off',
-    'max-nested-callbacks': 'off',
+    'max-depth': 'warn',
+    'max-nested-callbacks': ['warn', 5],
     'max-params': 'off',
     'max-statements': 'off',
-    'max-statements-per-line': 'off',
+    'max-statements-per-line': ['warn', { max: 2 }],
     'new-cap': ['warn', { 'properties': false }],
     'new-parens': 'warn',
     'newline-after-var': 'off',
     'newline-before-return': 'off',
-    // REVIST POLICY: 'newline-per-chained-call': 'warn',
+    'newline-per-chained-call': 'off',
     'no-array-constructor': 'off',
     'no-bitwise': 'error',
     'no-continue': 'off',
@@ -136,17 +144,17 @@
     'no-ternary': 'off',
     'no-trailing-spaces': 'error',
     'no-underscore-dangle': 'off',
-    // DEFINE POLICY: 'no-unneeded-ternary': 'off',
+    'no-unneeded-ternary': 'off',
     'no-whitespace-before-property': 'warn',
-    // DEFINE POLICY: 'object-curly-newline': 'off,
-    // DEFINE POLICY: 'object-curly-spacing': 'off',
-    // DEFINE POLICY: 'object-property-newline': 'off',
+    'object-curly-newline': 'off',
+    'object-curly-spacing': 'warn',
+    'object-property-newline': 'off',
     'one-var': 'off',
-    // DEFINE POLICY: 'one-var-declaration-per-line': 'off',
+    'one-var-declaration-per-line': ['warn', 'initializations'],
     'operator-assignment': 'off',
     'operator-linebreak': 'off',
     'padded-blocks': 'off',
-    // DEFINE POLICY: 'quote-props': 'off',
+    'quote-props': ['warn', 'as-needed', {'unnecessary': false, 'keywords': true, 'numbers': true}],
     'quotes': 'off',
     'require-jsdoc': 'warn',
     'semi': 'error',

Gruntfile.js

@@ -104,13 +104,18 @@ module.exports = function(grunt) {
         eslint: {
             // Even though warnings dont stop the build we don't display warnings by default because
             // at this moment we've got too many core warnings.
-            options: { quiet: !grunt.option('show-lint-warnings') },
+            options: {quiet: !grunt.option('show-lint-warnings')},
             // Check AMD files. We add some stricter rules which we can't apply to the default configuration due
             // to YUI rollups.
             amd: {
               src: amdSrc,
               options: {
-                  rules: {'no-undef': 'error', 'no-unused-vars': 'error', 'no-empty': 'error', 'no-unused-expressions': 'error'}
+                  rules: {
+                    'no-undef': 'error',
+                    'no-unused-vars': 'error',
+                    'no-unused-expressions': 'error',
+                    'no-implicit-globals': 'error'
+                  }
               }
             },
             // Check YUI module source files.

admin/tool/lp/amd/src/tree.js

@@ -274,6 +274,8 @@ define(['jquery', 'core/url', 'core/log'], function($, url, log) {
      * @param {Event} e The event.
      * @return {Boolean}
      */
+     // This function should be simplified. In the meantime..
+    // eslint-disable-next-line complexity
     Tree.prototype.handleKeyDown = function(item, e) {
         var currentIndex = this.visibleItems.index(item);
         var newItem = null;

lib/amd/src/tree.js

@@ -343,6 +343,8 @@ define(['jquery'], function($) {
      * @param {Event} e The event.
      * @return {Boolean}
      */
+     // This function should be simplified. In the meantime..
+     // eslint-disable-next-line complexity
     Tree.prototype.handleKeyDown = function(item, e) {
         var currentIndex = this.getVisibleItems().index(item);
 

package.json

@@ -4,6 +4,7 @@
   "description": "Moodle",
   "devDependencies": {
     "async": "^1.5.2",
+    "eslint": "^2.13.1",
     "grunt": "0.4.5",
     "grunt-contrib-less": "1.1.0",
     "grunt-contrib-uglify": "0.11.0",