.eslintrc.json

{
    "env": {
        "browser": true,
        "commonjs": true,
        "es6": true,
        "node": true
    },

    "extends": "eslint:recommended",
    "parser": "@babel/eslint-parser",
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module"
    },

    "rules": {
        "indent": ["error", 4],
        "linebreak-style": ["error", "unix"],
        "quotes": ["error", "double"],
        "semi": ["error", "always"]
    }
}