.eslintrc.json

{
  "parser": "babel-eslint",
  "extends": ["eslint:recommended", "google"],

  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module"
  },

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

  "rules": {
    "block-scoped-var": "error",
    "brace-style": ["error", "1tbs"],
    "consistent-return": "error",
    "curly": ["error", "all"],
    "comma-dangle": ["error", "always-multiline"],
    "comma-spacing": ["error", {"before": false, "after": true}],
    "default-case": "error",
    "dot-notation": "error",
    "eqeqeq": "error",
    "guard-for-in": "off",
    "no-console": "off",
    "no-debugger": "off",
    "no-extend-native": "off",
    "no-extra-parens": "error",
    "no-extra-semi": "error",
    "no-irregular-whitespace": "error",
    "no-unreachable": "error",
    "no-unused-vars": ["error", {
      "vars": "all",
      "args": "none",
      "ignoreRestSiblings": false,
      "varsIgnorePattern": "^_"
    }],
    "no-multiple-empty-lines": ["error", {
      "max": 1,
      "maxEOF": 0,
      "maxBOF": 0
    }],
    "prefer-const": "error",
    "radix": "error",
    "require-jsdoc": "off",
    "sort-imports": ["error", {
      "ignoreCase": true,
      "memberSyntaxSortOrder": ["all", "multiple", "single", "none"]
    }],
    "space-before-function-paren": ["error", "always"],
    "space-infix-ops": "error",
    "valid-typeof": "error",
    "quotes": ["error", "single", {"avoidEscape": true}]
  }
}