.eslintrc.js

var OFF = 0, WARN = 1, ERROR = 2;

module.exports = exports = {
    "env": {
        "es6": true
    },

    "ecmaFeatures": {
        // env=es6 doesn't include modules, which we are using
        "modules": true
    },

    "extends": "eslint:recommended",

    "rules": {
        // Possible Errors (overrides from recommended set)
        "no-extra-parens": ERROR,
        "no-unexpected-multiline": ERROR,
        // All JSDoc comments must be valid
        "valid-jsdoc": [ ERROR, {
            "requireReturn": false,
            "requireReturnDescription": false,
            "requireParamDescription": true,
            "prefer": {
                "return": "returns"
            }
        }],

        // Best Practices

        // Allowed a getter without setter, but all setters require getters
        "accessor-pairs": [ ERROR, {
            "getWithoutSet": false,
            "setWithoutGet": true
        }],
        "block-scoped-var": WARN,
        "consistent-return": ERROR,
        "curly": ERROR,
        "default-case": WARN,
        // the dot goes with the property when doing multiline
        "dot-location": [ WARN, "property" ],
        "dot-notation": WARN,
        "eqeqeq": [ ERROR, "smart" ],
        "guard-for-in": WARN,
        "no-alert": ERROR,
        "no-caller": ERROR,
        "no-case-declarations": WARN,
        "no-div-regex": WARN,
        "no-else-return": WARN,
        "no-empty-label": WARN,
        "no-empty-pattern": WARN,
        "no-eq-null": WARN,
        "no-eval": ERROR,
        "no-extend-native": ERROR,
        "no-extra-bind": WARN,
        "no-floating-decimal": WARN,
        "no-implicit-coercion": [ WARN, {
            "boolean": true,
            "number": true,
            "string": true
        }],
        "no-implied-eval": ERROR,
        "no-invalid-this": ERROR,
        "no-iterator": ERROR,
        "no-labels": WARN,
        "no-lone-blocks": WARN,
        "no-loop-func": ERROR,
        "no-magic-numbers": WARN,
        "no-multi-spaces": ERROR,
        "no-multi-str": WARN,
        "no-native-reassign": ERROR,
        "no-new-func": ERROR,
        "no-new-wrappers": ERROR,
        "no-new": ERROR,
        "no-octal-escape": ERROR,
        "no-param-reassign": ERROR,
        "no-process-env": WARN,
        "no-proto": ERROR,
        "no-redeclare": ERROR,
        "no-return-assign": ERROR,
        "no-script-url": ERROR,
        "no-self-compare": ERROR,
        "no-throw-literal": ERROR,
        "no-unused-expressions": ERROR,
        "no-useless-call": ERROR,
        "no-useless-concat": ERROR,
        "no-void": WARN,
        // Produce warnings when something is commented as TODO or FIXME
        "no-warning-comments": [ WARN, {
            "terms": [ "TODO", "FIXME" ],
            "location": "start"
        }],
        "no-with": WARN,
        "radix": WARN,
        "vars-on-top": ERROR,
        // Enforces the style of wrapped functions
        "wrap-iife": [ ERROR, "outside" ],
        "yoda": ERROR,

        // Strict Mode - for ES6, never use strict.
        "strict": [ ERROR, "never" ],

        // Variables
        "init-declarations": [ ERROR, "always" ],
        "no-catch-shadow": WARN,
        "no-delete-var": ERROR,
        "no-label-var": ERROR,
        "no-shadow-restricted-names": ERROR,
        "no-shadow": WARN,
        // We require all vars to be initialized (see init-declarations)
        // If we NEED a var to be initialized to undefined, it needs to be explicit
        "no-undef-init": OFF,
        "no-undef": ERROR,
        "no-undefined": OFF,
        "no-unused-vars": WARN,
        // Disallow hoisting - let & const don't allow hoisting anyhow
        "no-use-before-define": ERROR,

        // Node.js and CommonJS
        "callback-return": [ WARN, [ "callback", "next" ]],
        "global-require": ERROR,
        "handle-callback-err": WARN,
        "no-mixed-requires": WARN,
        "no-new-require": ERROR,
        // Use path.concat instead
        "no-path-concat": ERROR,
        "no-process-exit": ERROR,
        "no-restricted-modules": OFF,
        "no-sync": WARN,

        // ECMAScript 6 support
        "arrow-body-style": [ ERROR, "always" ],
        "arrow-parens": [ ERROR, "always" ],
        "arrow-spacing": [ ERROR, { "before": true, "after": true }],
        "constructor-super": ERROR,
        "generator-star-spacing": [ ERROR, "before" ],
        "no-arrow-condition": ERROR,
        "no-class-assign": ERROR,
        "no-const-assign": ERROR,
        "no-dupe-class-members": ERROR,
        "no-this-before-super": ERROR,
        "no-var": WARN,
        "object-shorthand": [ WARN, "never" ],
        "prefer-arrow-callback": WARN,
        "prefer-spread": WARN,
        "prefer-template": WARN,
        "require-yield": ERROR,

        // Stylistic - everything here is a warning because of style.
        "array-bracket-spacing": [ WARN, "always" ],
        "block-spacing": [ WARN, "always" ],
        "brace-style": [ WARN, "1tbs", { "allowSingleLine": false } ],
        "camelcase": WARN,
        "comma-spacing": [ WARN, { "before": false, "after": true } ],
        "comma-style": [ WARN, "last" ],
        "computed-property-spacing": [ WARN, "never" ],
        "consistent-this": [ WARN, "self" ],
        "eol-last": WARN,
        "func-names": WARN,
        "func-style": [ WARN, "declaration" ],
        "id-length": [ WARN, { "min": 2, "max": 32 } ],
        "indent": [ WARN, 4 ],
        "jsx-quotes": [ WARN, "prefer-double" ],
        "linebreak-style": [ WARN, "unix" ],
        "lines-around-comment": [ WARN, { "beforeBlockComment": true } ],
        "max-depth": [ WARN, 8 ],
        "max-len": [ WARN, 132 ],
        "max-nested-callbacks": [ WARN, 8 ],
        "max-params": [ WARN, 8 ],
        "new-cap": WARN,
        "new-parens": WARN,
        "no-array-constructor": WARN,
        "no-bitwise": OFF,
        "no-continue": OFF,
        "no-inline-comments": OFF,
        "no-lonely-if": WARN,
        "no-mixed-spaces-and-tabs": WARN,
        "no-multiple-empty-lines": WARN,
        "no-negated-condition": OFF,
        "no-nested-ternary": WARN,
        "no-new-object": WARN,
        "no-plusplus": OFF,
        "no-spaced-func": WARN,
        "no-ternary": OFF,
        "no-trailing-spaces": WARN,
        "no-underscore-dangle": WARN,
        "no-unneeded-ternary": WARN,
        "object-curly-spacing": [ WARN, "always" ],
        "one-var": OFF,
        "operator-assignment": [ WARN, "never" ],
        "operator-linebreak": [ WARN, "after" ],
        "padded-blocks": [ WARN, "never" ],
        "quote-props": [ WARN, "consistent-as-needed" ],
        "quotes": [ WARN, "single" ],
        "require-jsdoc": [ WARN, {
            "require": {
                "FunctionDeclaration": true,
                "MethodDefinition": true,
                "ClassDeclaration": false
            }
        }],
        "semi-spacing": [ WARN, { "before": false, "after": true }],
        "semi": [ ERROR, "always" ],
        "sort-vars": OFF,
        "space-after-keywords": [ WARN, "always" ],
        "space-before-blocks": [ WARN, "always" ],
        "space-before-function-paren": [ WARN, "never" ],
        "space-before-keywords": [ WARN, "always" ],
        "space-in-parens": [ WARN, "never" ],
        "space-infix-ops": [ WARN, { "int32Hint": true } ],
        "space-return-throw-case": ERROR,
        "space-unary-ops": ERROR,
        "spaced-comment": [ WARN, "always" ],
        "wrap-regex": WARN
    }
};