Enable more eslint recommended rules (#11168)

* chore: enable no-constant-condition

* chore: enable no-empty rule

* chore: enable no-unreachable

* chore: enable no-cond-assign

* chore: enable no-inner-declarations

* chore: remove disabled rules that are not in eslint:recommended

* fix: oops

eslint/babel-eslint-config-internal/index.js

@@ -19,29 +19,14 @@ module.exports = {
     browser: true,
   },
   rules: {
-    camelcase: "off",
-    "consistent-return": "off",
     curly: ["error", "multi-line"],
     "linebreak-style": ["error", "unix"],
-    "new-cap": "off",
     "no-case-declarations": "error",
-    "no-cond-assign": "off",
     "no-confusing-arrow": "error",
-    "no-console": "off",
-    "no-constant-condition": "off",
-    "no-empty": "off",
-    "no-inner-declarations": "off",
-    "no-labels": "off",
-    "no-loop-func": "off",
+    "no-empty": ["error", { allowEmptyCatch: true }],
     "no-process-exit": "error",
-    "no-return-assign": "off",
-    "no-shadow": "off",
-    "no-underscore-dangle": "off",
-    "no-unreachable": "off",
-    "no-use-before-define": "off",
     "no-var": "error",
     "prefer-const": "error",
-    strict: "off",
     "flowtype/define-flow-type": "warn",
     "flowtype/use-flow-type": "warn",
   },