feat(eslint): Rule "no-var"

Signed-off-by: Valentin Popov <info@valentineus.link>

ROADMAP.md

@@ -216,7 +216,7 @@
 - [ ] "no-useless-escape"
 - [ ] "no-useless-rename"
 - [ ] "no-useless-return"
-- [ ] "no-var"
+- [X] "no-var"
 - [ ] "no-void"
 - [ ] "no-warning-comments"
 - [ ] "no-whitespace-before-property"

src/rules/default.json

@@ -362,6 +362,9 @@
       "vars": "all"
     }
   ],
+  "no-var": [
+    "error"
+  ],
   "object-curly-newline": [
     "error",
     {