.eslintrc.json

{
    "extends": "react-app",
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
        "ecmaFeatures": {
            "jsx": true
        }
    },
    "rules": {
        "semi": "error",
        "indent": [
            "error",
            4,
            {
                "SwitchCase": 1
            }
        ],
        "quotes": ["warn", "double"],
        "max-len": [
            "error",
            {
                "code": 80,
                "tabWidth": 4
            }
        ]
    }
}