.eslintrc.json

{
    "env": {
        "browser": true,
        "commonjs": true,
        "es6": true,
        "node": true
    },
    "parserOptions": {
        "ecmaFeatures": {
            "arrowFunctions": true,
            "classes": true,
            "templateStrings": true,
            "generators": true
        },
        "sourceType": "module"
    },
    "rules": {
        "no-const-assign": "error",
        "no-this-before-super": "error",
        "no-undef": "error",
        "no-unreachable": "error",
        "no-unused-vars": "error",
        "constructor-super": "error",
        "valid-typeof": "error",
        "no-mixed-spaces-and-tabs": "error",
        "arrow-parens": "off",
        "arrow-body-style": "off",
        "yield-star-spacing": "error",
        "curly": "error",
        "comma-spacing": "error",
        "default-case": "error",
        "eqeqeq": "error",
        "indent": ["error", 2],
        "block-scoped-var": "error"
    }
}