.eslintrc.json

{
    "parserOptions": {
        "ecmaVersion": 8,
        "sourceType": "module",
        "ecmaFeatures": {
            "globalReturn": true,
            "jsx": false
        }
    },
    "env": {
        "es6": true,
        "node": true,
        "browser": false,
        "jest": true
    },
    "plugins": [],
    "globals": {
        "document": false,
        "navigator": false,
        "window": false,
        "google": false,
        "jest": true
    },

    // see .eslintignore for additional config

    "extends": "xo",
    "rules": {
        "indent": [2, 4, { "SwitchCase": 1 }],
        "curly": [2, "multi-line", "consistent"],
        "one-var": 0,
        "no-unused-vars": 1,
        "object-curly-spacing": 0,
        "operator-linebreak": 0,
        "padded-blocks": 0,
        "no-negated-condition": 0,
        "quote-props": 0,
        "no-lonely-if": 0,
        "no-prototype-builtins": 0,
        "capitalized-comments": 0,
        "no-multi-spaces": 0,
        "semi": [2, "always"],

        // embrace ES2015

        "arrow-parens": [2, "as-needed"],
        "arrow-spacing": [2, { "before": true, "after": true }],
        "constructor-super": 2,
        "generator-star-spacing": [2, { "before": true, "after": true }],
        "no-class-assign": 2,
        "no-const-assign": 2,
        "no-dupe-class-members": 2,
        "no-this-before-super": 2,
        "no-var": 2,
        "object-shorthand": 2,
        "prefer-arrow-callback": 1,
        "prefer-const": 2,
        "prefer-spread": 2,
        "prefer-reflect": 0,
        // "prefer-template": 1,
        "require-yield": 2,
        "lines-between-class-members": 0
    }
}