.eslintrc.json

{
  "env": {
    "node": true
  },
  "globals": {
    "describe": true,
    "beforeEach": true,
    "before": true,
    "it": true
  },
  "extends": "eslint:recommended",
  "rules": {
    "array-callback-return": "warn",
    "brace-style": ["error", "1tbs"],
    "complexity": ["warn", 20],
    "eqeqeq": "error",
    "guard-for-in": "error",
    "indent": ["error", 2, {
      "SwitchCase": 1
    }],
    "linebreak-style": ["error", "unix"],
    "no-array-constructor": "error",
    "no-console": "off",
    "no-lonely-if": "warn",
    "no-loop-func": "warn",
    "no-mixed-spaces-and-tabs": ["error"],
    "no-nested-ternary": "error",
    "no-spaced-func": "error",
    "no-trailing-spaces": "error",
    "semi": ["error", "always"],
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", "never"],
    "keyword-spacing": ["error", {
      "before": true,
      "after": true
    }],
    "curly": ["error", "all"]
  }
}