.eslintrc.json

{
  "env": {
    "browser": true,
    "es6": true,
    "node": true,
    "mocha": true
  },
  "parserOptions": {
      "ecmaVersion": 6,
      "sourceType": "module"
  },
  "plugins": [
    "html"
  ],
  "extends": "eslint:recommended",
  "rules": {
    "array-bracket-spacing": ["warn", "never", { "arraysInArrays": true }],
    "array-callback-return": "error",
    "arrow-body-style": "error",
    "arrow-parens": ["error", "as-needed"],
    "arrow-spacing": "error",
    "block-spacing": "error",
    "brace-style": "error",
    "callback-return": ["error", ["callback", "cb", "next", "done"]],
    "comma-dangle": ["error", "only-multiline"],
    "comma-spacing": "error",
    "comma-style": "error",
    "complexity": "error",
    "computed-property-spacing": "error",
    "curly": ["error", "multi"],
    "dot-location": ["error", "property"],
    "dot-notation": "error",
    "eqeqeq": "error",
    "global-require": "warn",
    "handle-callback-err": "error",
    "indent": ["error", 4, { "SwitchCase": 1 }],
    "init-declarations": "error",
    "key-spacing": "error",
    "keyword-spacing": "error",
    "lines-around-comment": "error",
    "linebreak-style": ["error", "unix"],
    "max-depth": "warn",
    "max-len": ["warn", 120],
    "max-nested-callbacks": ["warn", 5],
    "new-cap": ["error", { "properties": false }],
    "new-parens": "error",
    "no-array-constructor": "error",
    "no-console": "warn",
    "no-else-return": "error",
    "no-empty-function": "warn",
    "no-eq-null": "error",
    "no-loop-func": "error",
    "no-nested-ternary": "error",
    "no-param-reassign": "error",
    "no-spaced-func": "error",
    "no-sequences": "error",
    "no-undef-init": "error",
    "no-unmodified-loop-condition": "warn",
    "no-unneeded-ternary": "error",
    "no-use-before-define": "error",
    "no-useless-escape": "error",
    "no-useless-concat": "error",
    "no-useless-constructor": "warn",
    "object-shorthand": "error",
    "operator-assignment": "error",
    "object-curly-spacing": ["error", "always", { "objectsInObjects": false }],
    "prefer-arrow-callback": "error",
    "prefer-const": "error",
    "prefer-rest-params": "error",
    "prefer-spread": "error",
    "quotes": ["error", "single", { "avoidEscape": true, "allowTemplateLiterals": true }],
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", "never"],
    "space-in-parens": "error",
    "space-infix-ops": "error",
    "spaced-comment": "error",
    "semi": ["error", "never"],
    "vars-on-top": "error",
    "yoda": ["error","never"]
  }
}