.eslintrc.json

{
    "env": {
        "es2020": true,
        "node": true
    },
    "extends": "eslint:recommended",
    "parserOptions": {
        "ecmaVersion": 2020,
        "sourceType": "script"
    },
    "rules": {
        "indent": [
            "warn", 4,
            { "SwitchCase": 1 }
        ],
        "operator-linebreak": [
            "warn",
            "before",
            { "overrides":
                {
                    "?": "after",
                    ":": "before"
                }
            }
        ],
        "semi": ["warn", "always"],
        "no-unused-expressions": "warn",
        "no-unused-vars": "warn",
        "no-console": "warn",
        "no-empty": "warn",
        "valid-typeof": "warn",
        "max-len": ["warn", {
            "code": 120,
            "comments": 90,
            "ignoreTrailingComments": true,
            "ignorePattern": "^//\\s*"
        }],
        "space-in-parens": ["warn", "never"],
        "object-curly-spacing": ["warn", "always", { "arraysInObjects": true, "objectsInObjects": true }]
    }
}