How i can get warning instead of error in ESLint for no-unused-vars?

How I can get a warning instead of an error while using ESLint?

I use ESLint 6.7.2 version with a plugin for babel and react.

This is my actual .eslintrc.json:

{
    "env": {
        "browser": true,
        "es6": true
    },
    "extends": [
        "eslint:recommended",
        "plugin:react/recommended"
    ],
    "globals": {
        "Atomics": "readonly",
        "SharedArrayBuffer": "readonly"
    },
    "parserOptions": {
        "ecmaFeatures": {
            "jsx": true
        },
        "ecmaVersion": 2018,
        "sourceType": "module"
    },
    "plugins": [
        "react"
    ],
    "rules": {
    },
    "settings": {
        "react" : {
            "version": "16.7.0"
        }
    },
    "parser": "babel-eslint"
}

I've found the answer:

It enough to add a rule for no-unused-vars:

"rules": {
    "no-unused-vars": "warn"
},

You can use warn, error or off to disable warnings.

Also, restart the server.