eslintrc.js

let Base = {
    "extends": ["airbnb"],
    parser: "babel-eslint",
    parserOptions: {
      "ecmaVersion": 6,
      "sourceType": "module",
      ecmaFeatures: {
        jsx: true,
        experimentalObjectRestSpread: true,
        impliedStrict: true,
      }
    },
    "env": {
      es6: true,
      browser: true
    },
    "settings": {
      "import/resolver": "webpack"
    }
};

const baseRules = {
    /////////////////////
   // Possible Errors //
  /////////////////////
  "no-cond-assign": 2,
  "no-constant-condition": 2,
  "no-dupe-args": 2,
  "no-dupe-keys": 2,
  "no-duplicate-case": 2,
  "no-empty": 2,
  "no-ex-assign": 2,
  "no-extra-boolean-cast": 2,
  "no-extra-semi": 2,
  "no-func-assign": 2,
  "no-inner-declarations": 2,
  "no-invalid-regexp": 2,
  "no-irregular-whitespace": [2, {
    "skipComments": true,
    "skipTemplates": true
  }],
  "no-obj-calls": 2,
  "no-sparse-arrays": 2,
  "no-unreachable": 2,
  "use-isnan": 2,
  "valid-jsdoc": [2, { "requireReturn": false }],
  "valid-typeof": 2,
     ////////////////////
    // Best Practices //
   ////////////////////
  "accessor-pairs": 1,
  "array-callback-return": 2,
  "block-scoped-var": 2,
  "complexity": [1, 7],
  "curly": 2,
  "default-case": [2, { "commentPattern": "^skip\\sdefault" }],
  "dot-location": [2, "property"],
  "dot-notation": 2,
  "eqeqeq": [2, "allow-null"],
  "no-case-declarations": 0,
  "no-empty-function": 2,
  "no-extra-bind": 2,
  "no-fallthrough": 2,
  "no-floating-decimal": 2,
  "no-native-reassign": 2,
  "no-implied-eval": 2,
  "no-loop-func": 2,
  "no-magic-numbers": [2, {
    "ignore": [0, 1, -1, 2, 3],
    "ignoreArrayIndexes": true,
    "enforceConst": false
  }],
  "no-multi-spaces": [2, {
    exceptions: {
      "VariableDeclarator" : true,
      "ImportDeclaration"  : true
    }
  }],
  "no-new-wrappers": 2,
  "no-new": 2,
  "no-param-reassign": [2, { "props": false }],
  "no-proto": 2,
  "no-redeclare": 2,
  "no-return-assign": 2,
  "no-script-url": 2,
  "no-self-assign": 2,
  "no-self-compare": 2,
  "no-unmodified-loop-condition": 2,
  "no-useless-concat": 2,
  "no-warning-comments": 2,
  "vars-on-top": 2,
  "wrap-iife": 2,
  "yoda": [2, "never", {
    "exceptRange": true,
  }],
  "strict": [2, "global"],
  "no-undef-init": 2,
  "no-shadow": 2,
  "no-undef": 2,
  "no-unused-vars": [2, { "varsIgnorePattern": "[iI]gnored" }],
  "no-use-before-define": 2,
  "array-bracket-spacing": [2, "never"],
  "global-require": 2,
  "handle-callback-err": 2,
  "no-mixed-requires": 2,
  "no-new-require": 2,
  "camelcase": 2,
  "block-spacing": 2,
  "brace-style": 2,
  // "comma-dangle": [2, "never"],
  "comma-dangle": 0,
  "comma-spacing": [ 2, {
    "before": false,
    "after": true
  }],
  "comma-style": 2,
  "consistent-this": [2, "ref"],
  "eol-last": 2,
  "no-spaced-func": 2,
  "indent": [2, 2],
  "func-style": [2, "declaration", { "allowArrowFunctions": true }],
  "id-blacklist": [2, "err", "e", "cb"],
  "id-length": [2, {"min": 2, "max": 30 }],
  "jsx-quotes": [2, "prefer-single"],
  "key-spacing": [2, {
    "multiLine": {
      "beforeColon": true,
      "afterColon": true,
      "align": "colon",
      "mode": "minimum"
    },
    "singleLine": {
      "beforeColon": true,
      "afterColon": true,
      "mode": "minimum"
    }
  }],
  "keyword-spacing": [2, {
    "before": true,
    "after": true
  }],
  "lines-around-comment": [2, {
    "beforeBlockComment": true,
    "afterLineComment": false,
    "allowBlockStart": true
  }],
  "max-depth": [2, 4],
  "max-lines": [2, {
    "max": 300,
    "skipBlankLines": true,
    "skipComments": true
  }],
  "max-nested-callbacks": [2, 4],
  "max-params": [2, 4],
  "max-statements-per-line": [2, {"max": 1}],
  "max-statements": [2, 20],
  "newline-after-var": [2, "always"],
  "newline-before-return": 2,
  "newline-per-chained-call": [2, { "ignoreChainWithDepth": 2 }],
  "no-array-constructor": 2,
  "no-inline-comments": 2,
  "no-lonely-if": 2,
  "no-mixed-operators": 2,
  "no-mixed-operators": [2, {
    "allowSamePrecedence": true
  }],
  "no-mixed-spaces-and-tabs": [2, "smart-tabs"],
  "no-multiple-empty-lines": [2, {
    'max': 2,
    "maxEOF": 1
  }],
  "no-nested-ternary": 0,
  "no-unneeded-ternary": 2,
  "no-whitespace-before-property": 2,
  "object-property-newline": 2,
  /*"object-curly-newline": [ 2,
    {
      "ObjectExpression": "always",
      "ObjectPattern": { "multiline": true}
      // "ObjectPattern": { "multiline": true, "minProperties": 2 }
    }
  ],*/
  "one-var-declaration-per-line": [2, "initializations"],
  "one-var": [2, {
    "var": "always",
    "let": "always",
    "const": "never",
    /*"uninitialized": "always",
    initialized: "never"*/
  }],
  "operator-assignment": [1, "always"],
  "padded-blocks": [2, "never"],
  "quotes": [2, "single", {"allowTemplateLiterals": true}],
  "require-jsdoc": [2, {
    "require": {
      "FunctionDeclaration": true,
      "MethodDefinition": true,
      "ClassDeclaration": true
    }
  }],
  "semi": [2, "never"], // http://blog.izs.me/post/2353458699/an-open-letter-to-javascript-leaders-regarding
  "space-infix-ops": 2,
  "spaced-comment": [2, "always", { "block": { "exceptions": ["-", "+", "*"] } }],
  // "arrow-body-style": [2, "as-needed", { requireReturnForObjectLiteral: true }],
  "arrow-body-style": 0,
  "arrow-parens": [2, "always"],
  "arrow-spacing": 2,
  "constructor-super": 2,
  "no-const-assign": 2,
  "no-duplicate-imports": 2,
  "no-useless-computed-key": 2,
  "no-useless-constructor": 2,
  "no-useless-rename": 2,
  "object-shorthand": 2,
  "prefer-const": 2,
  "prefer-arrow-callback": 2,
  "prefer-template": 2,
  "template-curly-spacing": 2,
  "no-confusing-arrow": [1, {"allowParens": false}],
  "max-len": [2, 150],
  "no-restricted-syntax": [0, "WithStatement"],
  "new-cap" : 0,
  "guard-for-in" : 0,
  "import/prefer-default-export" : 0
};

const PROD = {
  "no-console"     : 0,
  "no-debugger"    : 2,
  "no-alert"       : 0,
  "no-unused-vars" : [2, { "varsIgnorePattern": "[iI]gnored" }]
};

const DEV = {
  "no-console"     : 1,
  "no-debugger"    : 1,
  "no-alert"       : 1,
  "no-unused-vars" : [1, { "varsIgnorePattern": "[iI]gnored" }]
};

const environment = (process.env.isProd == "true")
  ? "--=--=--=-- Production --=--=--=--"
  : "--=--=--=-- Development --=--=--=--";

const rules = (process.env.isProd == "true")
  ? Object.assign({}, baseRules, PROD)
  : Object.assign({}, baseRules, DEV);


Base.rules = rules;

module.exports = Base;