.eslintrc.json

{
  "rules": {
    "no-var": "error",
    "prefer-const": "off",
    "max-len": [
      "warn",
      200
    ],
    "quotes": [
      "warn",
      "single",
      {
        "allowTemplateLiterals": true
      }
    ],
    "require-jsdoc": "off",
    "valid-jsdoc": "off",
    "comma-dangle": [
      "error",
      {
        "arrays": "only-multiline",
        "objects": "only-multiline",
        "imports": "never",
        "exports": "never",
        "functions": "ignore"
      }
    ],
    // Possible Errors
    "no-cond-assign": "error",
    "no-constant-condition": "error",
    "no-control-regex": "error",
    "no-debugger": "error",
    "no-dupe-args": "error",
    "no-dupe-keys": "error",
    "no-duplicate-case": "error",
    "no-empty-character-class": "error",
    "no-ex-assign": "error",
    "no-extra-boolean-cast": "error",
    "no-extra-semi": "error",
    "no-func-assign": "error",
    "no-inner-declarations": "error",
    "no-invalid-regexp": "error",
    "no-irregular-whitespace": "error",
    "no-negated-in-lhs": "error",
    "no-obj-calls": "error",
    "no-regex-spaces": "error",
    "no-sparse-arrays": "error",
    "no-unreachable": "error",
    "use-isnan": "error",
    "valid-typeof": "error",
    "no-unexpected-multiline": "error",
    // Best Practices
    "accessor-pairs": "error",
    "array-callback-return": "error",
    "block-scoped-var": "error",
    "curly": "warn",
    "default-case": "error",
    "dot-notation": "off",
    "dot-location": [
      "error",
      "property"
    ],
    "eqeqeq": "error",
    "guard-for-in": "error",
    "no-alert": "error",
    "no-caller": "error",
    "no-case-declarations": "off",
    "no-div-regex": "error",
    "no-else-return": "off",
    "no-empty-pattern": "error",
    "no-eq-null": "error",
    "no-eval": "error",
    "no-extend-native": "error",
    "no-extra-bind": "error",
    "no-extra-label": "error",
    "no-fallthrough": "error",
    "no-floating-decimal": "error",
    "no-implicit-coercion": [
      "error",
      {
        "allow": [
          "!!"
        ]
      }
    ],
    "no-implicit-globals": "error",
    "no-implied-eval": "error",
    "no-iterator": "error",
    "no-labels": "error",
    "no-lone-blocks": "error",
    "no-loop-func": "error",
    "no-multi-spaces": "error",
    "no-multi-str": "error",
    "no-native-reassign": "error",
    "no-new-func": "error",
    "no-new-wrappers": "error",
    "no-new": "error",
    "no-octal-escape": "error",
    "no-octal": "error",
    "no-proto": "error",
    "no-redeclare": "error",
    "no-return-assign": [
      "error",
      "always"
    ],
    "no-script-url": "error",
    "no-self-assign": "error",
    "no-self-compare": "error",
    "no-sequences": "error",
    "no-throw-literal": "error",
    "no-unmodified-loop-condition": "error",
    "no-unused-expressions": "error",
    "no-unused-labels": "error",
    "no-useless-call": "error",
    "no-useless-concat": "error",
    "no-useless-escape": "error",
    "no-void": "error",
    "no-warning-comments": [
      "off",
      {
        "terms": [
          "todo",
          "fixme",
          "xxx"
        ],
        "location": "start"
      }
    ],
    "no-with": "error",
    "radix": "off",
    "wrap-iife": [
      "error",
      "inside"
    ],
    "yoda": "error",
    // Variables
    "no-delete-var": "error",
    "no-label-var": "error",
    "no-restricted-globals": [
      "error",
      "event"
    ],
    "no-shadow-restricted-names": "error",
    "no-undef-init": "error",
    "no-undef": [
      "error",
      {
        "typeof": true
      }
    ],
    "no-unused-vars": "warn",
    "no-use-before-define": [
      "error",
      "nofunc"
    ],
    // Node.js

    "handle-callback-err": 1,
    "no-mixed-requires": [
      "error",
      {
        "grouping": true,
        "allowCall": true
      }
    ],
    "no-new-require": "error",
    "no-path-concat": "error",
    "no-restricted-imports": [
      "error",
      "domain",
      "freelist",
      "smalloc",
      "sys",
      "colors"
    ],
    "no-restricted-modules": [
      "error",
      "domain",
      "freelist",
      "smalloc",
      "sys",
      "colors"
    ],
    // Stylistic Issues
    "array-bracket-spacing": [
      "error",
      "never"
    ],
    "brace-style": "warn",
    "camelcase": [
      "warn",
      {
        "properties": "never"
      }
    ],
    "comma-spacing": "warn",
    "comma-style": [
      "error",
      "last"
    ],
    "computed-property-spacing": [
      "error",
      "never"
    ],
    "eol-last": "warn",
    "indent": [
      "warn",
      4,
      {
        "SwitchCase": 1,
        "MemberExpression": 0
      }
    ],
    "jsx-quotes": "error",
    "key-spacing": "warn",
    "keyword-spacing": "warn",
    "linebreak-style": [
      "error",
      "unix"
    ],
    "max-nested-callbacks": [
      1,
      4
    ],
    "max-statements-per-line": "error",
    "new-cap": [
      "error",
      {
        "newIsCap": true,
        "capIsNew": true
      }
    ],
    "new-parens": "error",
    "no-array-constructor": "error",
    "no-lonely-if": "error",
    "no-mixed-spaces-and-tabs": "error",
    "no-multiple-empty-lines": "warn",
    "no-nested-ternary": 1,
    "no-negated-condition": "off",
    "no-new-object": "error",
    "no-restricted-syntax": [
      "error",
      "WithStatement"
    ],
    "no-whitespace-before-property": "error",
    "no-spaced-func": "error",
    "no-trailing-spaces": [
      "error",
      {
        "skipBlankLines": true
      }
    ],
    "no-unneeded-ternary": "warn",
    "object-curly-spacing": [
      "warn",
      "always"
    ],
    "one-var": [
      "error",
      "never"
    ],
    "one-var-declaration-per-line": "error",
    "operator-assignment": [
      "error",
      "always"
    ],
    "operator-linebreak": [
      "error",
      "after"
    ],
    "padded-blocks": "off",
    "quote-props": [
      "warn",
      "consistent"
    ],
    "semi-spacing": [
      "error",
      {
        "before": false,
        "after": true
      }
    ],
    "semi": [
      "error",
      "always"
    ],
    "space-before-blocks": "warn",
    "space-before-function-paren": [
      "warn",
      {
        "anonymous": "never",
        "named": "never",
        "asyncArrow": "always"
      }
    ],
    "space-in-parens": "warn",
    "space-infix-ops": "warn",
    "space-unary-ops": "error",
    "spaced-comment": "off",
    // ES2015
    "arrow-parens": [
      "warn",
      "as-needed"
    ],
    "arrow-spacing": [
      "warn",
      {
        "before": true,
        "after": true
      }
    ],
    "constructor-super": "error",
    "generator-star-spacing": [
      "error",
      "both"
    ],
    "no-class-assign": "error",
    "no-const-assign": "error",
    "no-dupe-class-members": "error",
    "no-duplicate-imports": [
      "error",
      {
        "includeExports": true
      }
    ],
    "no-new-symbol": "error",
    "no-this-before-super": "error",
    "no-useless-constructor": "error",
    "template-curly-spacing": "error",
    "yield-star-spacing": [
      "error",
      "both"
    ]
  }
}