ESLint rules

.eslintrc.json

{
  "parserOptions": {
    "ecmaVersion": 2015
  },
  "env": {
    "es6": true,
    "node": true
  },
  "plugins": [
    "mocha",
    "promise"
  ],
  "extends": [
    "eslint:recommended",
    "plugin:promise/recommended"
  ],
  "rules": {
    "for-direction": "error",
    "getter-return": "error",
    "no-await-in-loop": "error",
    "no-extra-parens": "error",
    "no-prototype-builtins": "error",
    "no-template-curly-in-string": "error",

    "curly": "error",
    "dot-location": ["error", "property"],
    "dot-notation": "error",
    "eqeqeq": ["error", "allow-null"],
    "no-caller": "error",
    "no-eval": "warn",
    "no-extend-native": "warn",
    "no-iterator": "warn",
    "no-loop-func": "warn",
    "no-multi-spaces": "error",
    "no-multi-str": "warn",
    "no-proto": "warn",
    "no-with": "error",

    "strict": "error",

    "no-use-before-define": "error",

    "block-spacing": "error",
    "brace-style": ["warn", "1tbs", { "allowSingleLine": true }],
    "camelcase": ["error", {
      "properties": "never"
    }],
    "comma-dangle": "error",
    "comma-style": "error",
    "consistent-this": ["error", "self"],
    "eol-last": "error",
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "key-spacing": "error",
    "keyword-spacing": "error",
    "linebreak-style": ["error", "unix"],
    "max-depth": ["error", 3],
    "max-len": ["error", 120],
    "max-statements": ["warn", 16],
    "new-cap": ["error", {
      "capIsNewExceptions": [
        "PlaybackStarted",
        "PlaybackFinished",
        "PlaybackStopped",
        "PlaybackNearlyFinished",
        "PlaybackFailed",
        "PlayPodcastIntent",
        "PlayRadioIntent",
        "AlexaSkillEvent.SkillDisabled",
        "AlexaSkillEvent.SkillEnabled",
        "AlexaSkillEvent.SkillAccountLinked"
      ]
    }],
    "no-lonely-if": "warn",
    "no-multiple-empty-lines": "error",
    "no-trailing-spaces": "error",
    "no-unneeded-ternary": "error",
    "one-var": ["error", "never"],
    "padding-line-between-statements": [
      "error",
      { "blankLine": "always", "prev": "*", "next": "block-like" },
      { "blankLine": "always", "prev": "block-like", "next": "*" }
    ],
    "quotes": ["error", "single"],
    "quote-props": ["error", "as-needed"],
    "semi": ["error", "always"],
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", {
      "anonymous": "always",
      "named": "never"
      }],
    "space-in-parens": "error",

    "arrow-body-style": "error",
    "arrow-parens": "error",
    "arrow-spacing": "error",
    "no-confusing-arrow": "error",
    "prefer-arrow-callback": "error",
    "prefer-const": "error",

    "mocha/no-exclusive-tests": "error",
    "mocha/no-return-and-callback": "error",
    "mocha/no-skipped-tests": "error",

    "promise/always-return": "off"
  }
}