.eslintrc.json

{
  "extends": ["eslint:recommended", "plugin:mocha/recommended", "airbnb"],
  "env": {
    "browser": true,
    "es6": true,
    "jquery": true,
    "node": true,
    "mocha": true
  },
  "parser": "babel-eslint",
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module"
  },
  "rules": {
    "arrow-body-style": [2, "as-needed"],
    "class-methods-use-this": "off",
    "eqeqeq": 2,
    "no-console": 1,
    "no-param-reassign": "off",
    "no-undef-init": 2,
    "no-undefined": 2,
    "no-unused-vars": [1, {
      "vars": "all",
      "args": "none"
    }],
    "no-use-before-define": "off",
    "no-useless-constructor": 2,
    "no-underscore-dangle": "off",
    "semi": [2, "always"],
    "comma-dangle": [1, "always-multiline"],
    "import/no-unresolved": "off",
    "import/extensions": "off",
    "import/no-extraneous-dependencies": "off",
    "import/prefer-default-export": 1,

    "no-unused-expressions": 0,
    "chai-friendly/no-unused-expressions": 2
  },
  "globals": {
    "logger": true
  },
  "plugins": ["chai-expect", "chai-friendly", "mocha"]
}