.eslintrc.json

{
    "extends": "eslint:recommended",
    "env": {
        "browser": true,
        "es6": true,
        "jest": true,
        "node": true
    },
    "ecmaFeatures": {
        "experimentalObjectRestSpread": true,
        "jsx": true,
        "modules": true
    },
    "parser": "babel-eslint",
    "rules": {
        "arrow-spacing": [
            2,
            {
                "before": true,
                "after": true
            }
        ],
        "comma-dangle": [
            2,
            "never"
        ],
        "curly": 2,
        "eol-last": 2,
        "id-length": [
            2,
            {
                "min": 2,
                "max": 40,
                "properties": "never",
                "exceptions": [
                    "x",
                    "_"
                ]
            }
        ],
        "indent": [
            2,
            4,
            {
                "SwitchCase": 1
            }
        ],
        "no-alert": 0,
        "no-console": 0,
        "no-const-assign": 2,
        "no-else-return": 2,
        "no-shadow": 2,
        "no-unused-vars": 2,
        "no-var": 2,
        "prefer-const": 2,
        "quotes": [
            2,
            "single"
        ],
        "semi": [
            2,
            "always"
        ],
        "spaced-comment": 0,
        "strict": [
            2,
            "never"
        ]
    }
}