.eslintrc.json

{
  "root": true,
  "env": {
    "browser": true,
    "commonjs": true,
    "node": true,
    "es6": true,
    "es2017": true,
    "es2018": true
  },
  "rules": {
    "no-undef-init": "error",
    "no-duplicate-case": "error",
    "no-empty": "error",
    "no-extra-semi": "error",
    "no-func-assign": "error",
    "no-irregular-whitespace": "error",
    "no-unreachable": "error",
    "curly": "error",
    "dot-notation": "error",
    "eqeqeq": "error",
    "no-empty-function": "error",
    "no-multi-spaces": "error",
    "no-mixed-spaces-and-tabs": "error",
    "no-trailing-spaces": "error",
    "default-case": "error",
    "no-fallthrough": "error",
    "no-unused-vars": "error",
    "no-use-before-define": "error",
    "no-redeclare": "error",
    "brace-style": "error",
    "indent": ["error", 4],
    "quotes": ["error", "single"],
    "semi": ["error", "always"],
    "radix": "off"
  }
}