ESlint config for ES6

.eslintrc

{
    "parser": "babel-eslint",
    "parserOptions": {
        "ecmaVersion": 2017,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true
          }
    },
    "rules": {
        "no-undef": 2
    },
    "env": {
        "node": true,
        "es6": true 
    }
}