diff -u b/.eslintrc.json b/.eslintrc.json
--- b/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,4 +1,95 @@
 {
-  "extends": "./core/.eslintrc.json",
-  "root": true
+  "extends": "eslint:recommended",
+  "env": {
+    "browser": true,
+    "es6": true,
+    "node": true
+  },
+  "globals": {
+    "Drupal": true,
+    "drupalSettings": true,
+    "drupalTranslations": true,
+    "domready": true,
+    "jQuery": true,
+    "_": true,
+    "matchMedia": true,
+    "Backbone": true,
+    "Modernizr": true,
+    "CKEDITOR": true
+  },
+  "rules": {
+    "array-bracket-spacing": [2, "never"],
+    "block-scoped-var": 2,
+    "brace-style": [2, "stroustrup", {"allowSingleLine": true}],
+    "comma-dangle": [2, "never"],
+    "comma-spacing": 2,
+    "comma-style": [2, "last"],
+    "computed-property-spacing": [2, "never"],
+    "curly": [2, "all"],
+    "eol-last": 2,
+    "eqeqeq": [2, "smart"],
+    "guard-for-in": 2,
+    "indent": [2, 2, {"SwitchCase": 1}],
+    "key-spacing": [2, {"beforeColon": false, "afterColon": true}],
+    "keyword-spacing": [2, {"before": true, "after": true}],
+    "linebreak-style": [2, "unix"],
+    "lines-around-comment": [2, {"beforeBlockComment": true, "afterBlockComment": false}],
+    "new-parens": 2,
+    "no-array-constructor": 2,
+    "no-caller": 2,
+    "no-catch-shadow": 2,
+    "no-eval": 2,
+    "no-extend-native": 2,
+    "no-extra-bind": 2,
+    "no-extra-parens": [2, "functions"],
+    "no-implied-eval": 2,
+    "no-iterator": 2,
+    "no-label-var": 2,
+    "no-labels": 2,
+    "no-lone-blocks": 2,
+    "no-loop-func": 2,
+    "no-multi-spaces": 2,
+    "no-multi-str": 2,
+    "no-native-reassign": 2,
+    "no-nested-ternary": 2,
+    "no-new-func": 2,
+    "no-new-object": 2,
+    "no-new-wrappers": 2,
+    "no-octal-escape": 2,
+    "no-process-exit": 2,
+    "no-proto": 2,
+    "no-return-assign": 2,
+    "no-script-url": 2,
+    "no-sequences": 2,
+    "no-shadow-restricted-names": 2,
+    "no-spaced-func": 2,
+    "no-trailing-spaces": 2,
+    "no-undef-init": 2,
+    "no-undefined": 2,
+    "no-unused-expressions": 2,
+    "no-unused-vars": [2, {"vars": "all", "args": "none"}],
+    "no-with": 2,
+    "object-curly-spacing": [2, "never"],
+    "one-var": [2, "never"],
+    "quote-props": [2, "consistent-as-needed"],
+    "quotes": [2, "single", "avoid-escape"],
+    "semi": [2, "always"],
+    "semi-spacing": [2, {"before": false, "after": true}],
+    "space-before-blocks": [2, "always"],
+    "space-before-function-paren": [2, {"anonymous": "always", "named": "never"}],
+    "space-in-parens": [2, "never"],
+    "space-infix-ops": 2,
+    "space-unary-ops": [2, { "words": true, "nonwords": false }],
+    "spaced-comment": [2, "always"],
+    "strict": [2, "function"],
+    "yoda": [2, "never"],
+    "max-nested-callbacks": [1, 3],
+    "valid-jsdoc": [1, {
+      "prefer": {
+        "returns": "return",
+        "property": "prop"
+      },
+      "requireReturn": false
+    }]
+  }
 }
diff -u b/core/.eslintrc.json b/core/.eslintrc.json
--- b/core/.eslintrc.json
+++ b/core/.eslintrc.json
@@ -18,10 +18,8 @@
     "CKEDITOR": true
   },
   "rules": {
-    // Override.
     "consistent-return": [0],
     "no-underscore-dangle": [0],
-    // Warnings.
     "max-nested-callbacks": [1, 3],
     "no-mutable-exports": [1],
     "no-plusplus": [1, {
only in patch2:
unchanged:
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,5 +1,4 @@
-core/assets/vendor/**/*
-core/modules/locale/tests/locale_test.js
+core/**/*
 vendor/**/*
 sites/**/files/**/*
 libraries/**/*