.eslintrc.json

{
  "root": true,
  "parserOptions": {
    "ecmaVersion": 6,
    "sourceType": "module",
    "ecmaFeatures": {
      "impliedStrict": true
    }
  },
  "extends": "eslint:recommended",
  "rules": {
    "no-console": "off",
    "no-constant-condition": "off",
    "no-extra-parens": [ "warn", "all", {
      "nestedBinaryExpressions": false
    } ],
    "strict": [ "error", "safe" ],
    "array-callback-return": "warn",
    "block-scoped-var": "warn",
    "curly": [ "error", "all" ],
    "valid-jsdoc": [ "warn", {
      "requireReturn": false
    } ],
    "dot-location": [ "warn", "property" ],
    "eqeqeq": "warn",
    "guard-for-in": "warn",
    "no-alert": "error",
    "no-extra-label": "error",
    "no-extra-bind": "error",
    "no-empty-function": "warn",
    "no-else-return": "warn",
    "no-invalid-this": "error",
    "no-iterator": "error",
    "no-lone-blocks": "error",
    "no-loop-func": "warn",
    "no-magic-numbers": [ "warn", { "ignore": [ 0, 1 ], "ignoreArrayIndexes": true } ],
    "no-multi-spaces": [ "warn" ],
    "no-multi-str": "error",
    "no-native-reassign": "error",
    "no-new": "error",
    "no-new-func": "warn",
    "no-new-wrappers": "error",
    "no-proto": "error",
    "no-return-assign": "error",
    "no-script-url": "warn",
    "no-sequences": "error",
    "no-unmodified-loop-condition": "error",
    "no-unused-expressions": [ "error", {
      "allowShortCircuit": true,
      "allowTernary": true
    } ],
    "no-useless-call": "warn",
    "no-useless-concat": "error",
    "no-useless-escape": "error",
    "vars-on-top": "error",
    "wrap-iife": [ "error", "outside" ],
    "no-use-before-define": [ "error", "nofunc" ],
    "no-path-concat": "error",
    "array-bracket-spacing": [ "warn", "always" ],
    "block-spacing": [ "warn", "always" ],
    "brace-style": "warn",
    "camelcase": "warn",
    "comma-spacing": "warn",
    "comma-style": "warn",
    "computed-property-spacing": [ "warn", "always" ],
    "eol-last": "warn",
    "indent": [ "warn", 2, {
      "SwitchCase": 1,
      "VariableDeclarator": { "var": 2, "let": 2, "const": 3 }
    } ],
    "key-spacing": [ "warn", { "beforeColon": false, "afterColon": true } ],
    "keyword-spacing": [ "warn", { "before": true, "after": true } ],
    "linebreak-style": "warn",
    "lines-around-comment": [ "warn", {
      "beforeBlockComment": true,
      "allowBlockStart": true,
      "allowBlockEnd": true,
      "allowObjectStart": true,
      "allowObjectEnd": true,
      "allowArrayStart": true,
      "allowArrayEnd": true
    } ],
    "new-cap": "warn",
    "new-parens": "error",
    "newline-after-var": "warn",
    "newline-before-return": "warn",
    "newline-per-chained-call": [ "warn", { "ignoreChainWithDepth": 2 } ],
    "no-lonely-if": "warn",
    "no-multiple-empty-lines": [ "warn", { "max": 5, "maxEOF": 1 } ],
    "no-spaced-func": "warn",
    "no-trailing-spaces": "warn",
    "no-unneeded-ternary": "warn",
    "no-whitespace-before-property": "warn",
    "object-curly-spacing": [ "warn", "always" ],
    "object-property-newline": "warn",
    "operator-assignment": [ "warn", "always" ],
    "operator-linebreak": [ "warn", "after" ],
    "quote-props": [ "error", "as-needed", { "keywords": true, "numbers": true } ],
    "quotes": [ "warn", "single", { "avoidEscape": true, "allowTemplateLiterals": true } ],
    "require-jsdoc": [ "warn", {
      "require": {
        "FunctionDeclaration": true,
        "MethodDefinition": true,
        "ClassDeclaration": true
      }
    } ],
    "semi": [ "warn", "always" ],
    "semi-spacing": "warn",
    "space-before-blocks": [ "warn", "always" ],
    "space-before-function-paren": [ "warn", { "anonymous": "always", "named": "never" } ],
    "space-in-parens": [ "warn", "always" ],
    "space-infix-ops": "warn",
    "space-unary-ops": [ "warn", { "words": true, "nonwords": false } ],
    "spaced-comment": [ "warn", "always" ],
    "arrow-body-style": [ "warn", "as-needed" ],
    "arrow-parens": [ "warn", "as-needed" ],
    "arrow-spacing": [ "warn", { "before": true, "after": true } ],
    "generator-star-spacing": [ "warn", { "before": true, "after": false } ],
    "no-duplicate-imports": "error",
    "no-useless-computed-key": "error",
    "no-useless-constructor": "error",
    "no-var": "error",
    "object-shorthand": [ "error", "always" ],
    "prefer-arrow-callback": [ "error", { "allowNamedFunctions": true } ],
    "prefer-const": "warn",
    "prefer-reflect": "warn",
    "prefer-rest-params": "error",
    "prefer-spread": "error",
    "prefer-template": "error",
    "require-yield": "warn",
    "template-curly-spacing": [ "warn", "always" ],
    "yield-star-spacing": [ "warn", { "before": true, "after": false } ]
  },
  "env": {
    "node": true,
    "es6": true
  }
}