.eslintrc

{
  "extends": ["eslint-config-airbnb", "prettier"],

  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module"
  },

  "parser": "babel-eslint",

  "env": {
    "browser": true,
    "node": true,
    "mocha": true,
    "es6": true
  },

  "rules": {
    //Possible Errors
    "no-console": "error",
    "no-unexpected-multiline": "error",

    // Best Practices
    "class-methods-use-this": "off",
    "consistent-return": ["error", { "treatUndefinedAsUnspecified": true }],
    "dot-location": ["error", "property"],
    "no-implicit-globals": "error",
    "no-invalid-this": "error",
    "no-param-reassign": ["error", { "props": false }],
    "no-unmodified-loop-condition": "error",
    "no-useless-call": "error",
    "no-void": "off",

    // Variables
    "no-catch-shadow": "error",
    "no-label-var": "error",
    "no-shadow": ["error", { "allow": ["cb", "next", "req", "res", "err", "error"] }],
    "no-undef-init": "error",
    "no-undefined": "error",
    "no-use-before-define": ["error", "nofunc"],
    "no-unused-expressions": ["error", { "allowShortCircuit": true }],
    "no-unused-vars": ["error", { "args": "none" }],

    // Node.js
    "callback-return": "error",
    "no-path-concat": "error",

    // Stylistic Issues
    "comma-dangle": ["error", "always-multiline"],
    "linebreak-style": ["error", "unix"],
    "no-plusplus": "off",


    // ECMAScript 6
    "arrow-parens": ["error", "always"],
    "constructor-super": "error",
    "generator-star-spacing": ["error", "after"],
    "no-this-before-super": "error",
    "prefer-arrow-callback": ["error", { "allowNamedFunctions": true }],
    "prefer-spread": "error",
    "prefer-template": "off",

    // coding styles
    "max-len": ["error", 100],

    "import/extensions": "off",
    "prefer-destructuring": "off"
  }
}