tools: enable no-empty ESLint rule

Refs: https://eslint.org/docs/rules/no-empty

Author: Trott

.eslintrc.js

@@ -295,7 +295,6 @@ module.exports = {
     'valid-typeof': ['error', { requireStringLiterals: true }],
 
     // ESLint recommended rules that we disable
-    'no-empty': 'off',
     'no-inner-declarations': 'off',
 
     // JSDoc recommended rules that we disable

benchmark/.eslintrc.yaml

@@ -5,6 +5,5 @@ env:
   es6: true
 
 rules:
-  no-empty: error
   no-var: error
   prefer-arrow-callback: error