New rule to prevent nested function declaration that causes an issue with strict mode

package.json

@@ -80,6 +80,7 @@
     "systemjs": "0.19.6",
     "through2": "^0.6.3",
     "tslint": "^3.7.1",
+    "tslint-eslint-rules": "^1.2.0",
     "typescript": "1.8.7",
     "vinyl": "^0.4.6",
     "webpack": "^1.12.2",
@@ -90,4 +91,4 @@
       "path": "node_modules/ionic-cz-conventional-changelog"
     }
   }
-}
+}

tslint.json

@@ -1,4 +1,5 @@
 {
+    "rulesDirectory": "node_modules/tslint-eslint-rules/dist/rules",
     "rules": {
         "class-name": true,
         "comment-format": [
@@ -52,6 +53,10 @@
             "check-operator",
             "check-separator",
             "check-type"
+        ],
+        "no-inner-declarations": [
+            true,
+            "functions"
         ]
     }
 }