Merge pull request #15 from tyearke/meta/js-style-for-in

Style: Removed ESLint rule prohibiting for...in statements

.eslintrc.json

@@ -76,6 +76,21 @@
     ],
     "no-continue": "off",
     "no-plusplus": "off",
-    "no-prototype-builtins": "off"
+    "no-prototype-builtins": "off",
+    "no-restricted-syntax": [
+      "error",
+      {
+        "selector": "ForOfStatement",
+        "message": "iterators/generators require regenerator-runtime, which is too heavyweight for this guide to allow them. Separately, loops should be avoided in favor of array iterations."
+      },
+      {
+        "selector": "LabeledStatement",
+        "message": "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand."
+      },
+      {
+        "selector": "WithStatement",
+        "message": "`with` is disallowed in strict mode because it makes code impossible to predict and optimize."
+      }
+    ]
   }
 }