Bug: for-of loop (no-unused-vars)

[shoonia]

Eslint says the const and let declared into for-of loop brackets never used.

Environment

• ESLint: v6.2.2
• Node: v10.13.0
• yarn: v1.12.3

babel-eslint with eslint:recommended

Configuration:

Configuration

{
  "parser": "babel-eslint",
  "extends": [
    "eslint:recommended"
  ],
  "parserOptions": {
    "ecmaVersion": 2018
  },
  "env": {
    "es6": true,
    "node": true,
    "browser": true,
    "mocha": true
  },
  "rules": {
    "linebreak-style": "off",
    "indent": [
      "error",
      2
    ],
    "quotes": [
      "error",
      "double"
    ],
    "semi": [
      "error",
      "always"
    ]
  }
}

const arr = [1, 2, 3];

for (const key1 of arr) {
  console.log(key1);
}

for (let key2 of arr) {
  console.log(key2);
}

yarn run v1.12.3
$ eslint . --fix

D:\projects\mini-css-class-name\es6\test.js
  3:12  error  'key1' is defined but never used  no-unused-vars
  7:10  error  'key2' is defined but never used  no-unused-vars

✖ 2 problems (2 errors, 0 warnings)

It works without errors in previous eslint v6.1.0

[mdjermanovic]

Hi @shoonia, thanks for the issue.

I'm closing this because it's a duplicate of #12117.

Please follow #12117 and babel/babel-eslint#791