remove ESLint rule covered in eslint:recommended

.eslintrc

@@ -2,7 +2,7 @@
   "parser": "@babel/eslint-parser",
   "extends": ["eslint:recommended", "eslint-config-prettier"],
   "parserOptions": {
-    "ecmaVersion": 2017,
+    "ecmaVersion": "latest",
     "sourceType": "module"
   },
   "rules": {
@@ -12,7 +12,6 @@
     "linebreak-style": ["error", "unix"],
     "max-len": ["error", 110, 2],
     "new-cap": "off",
-    "no-case-declarations": "error",
     "no-cond-assign": "off",
     "no-confusing-arrow": "error",
     "no-console": "off",
@@ -28,8 +27,6 @@
     "no-underscore-dangle": "off",
     "no-unreachable": "off",
     "no-use-before-define": "off",
-    "no-var": "error",
-    "prefer-const": "error",
     "strict": "off",
     "prettier/prettier": "error"
   },