.eslintrc.json

{
    "extends": "eslint:recommended",
    "parserOptions": {
        "ecmaFeatures": {
            // node 5.1 features
            "arrowFunctions": true,
            "blockBindings": true,
            "classes": true,
            "forOf": true,
            "generators": true,
            "spread": true,
            "superInFunctions": false
        },
    },
    "env": {
        "node": true,
        "es6": true
    },
    "rules": {
        // best practices
        "eqeqeq": 2,
        "curly": 2,
        "consistent-return": 2,
        "no-extra-bind": 2,
        "no-eval": 2,
        "no-implied-eval": 2,
        "no-loop-func": 2,
        "no-magic-numbers": 1,
        "no-native-reassign": 2,
        "no-new-func": 2,
        "no-redeclare": 2,
        "no-useless-call": 2,
        "vars-on-top": 1,

        // strict mode
        "strict": [2, "global"],

        // variables
        "init-declarations": 2,
        "no-delete-var": 2,
        "no-shadow": 1,
        "no-undef-init": 2,
        "no-unused-vars": 2,
        "no-use-before-define": 2,

        // nodejs
        "handle-callback-err": [2, "^(err|error)$"],
        "no-process-exit": 2,

        // style
        "block-spacing": 2,
        "brace-style": 2,
        "camelcase": 2,
        "indent": 2,
        "keyword-spacing": 2,
        "linebreak-style": 2,
        "max-len": [2, 120],
        "no-mixed-spaces-and-tabs": 2,
        "no-nested-ternary": 2,
        "quotes": [2, "single"],
        "require-jsdoc": 2,
        "semi": [2, "always"],
        "space-before-blocks": 2,

        // es6
        "arrow-body-style": [2, "as-needed"],
        "arrow-spacing": 2,
        "constructor-super": 2,
        "no-class-assign": 2,
        "no-confusing-arrow": 2,
        "no-const-assign": 2,
        "no-constant-condition": 2,
        "no-dupe-class-members": 2,
        "no-this-before-super": 2,
        "no-var": 2,
        "prefer-arrow-callback": 1,
        "prefer-spread": 2,
        "require-yield": 2
    }
}