.eslintrc.js

module.exports = {
  "env": {
    "browser": true,
    "jquery": true
  },

  "extends": "",
  "rules": {
    // enforces getter/setter pairs in objects
    'accessor-pairs': 'off',

    // enforces return statements in callbacks of array's methods
    // http://eslint.org/docs/rules/array-callback-return
    'array-callback-return': 'error',

    // treat var statements as if they were block scoped
    'block-scoped-var': 'error',

    // specify the maximum cyclomatic complexity allowed in a program
    'complexity': ['off', 11],

    // require return statements to either always or never specify values
    'consistent-return': 'error',

    // specify curly brace conventions for all control statements
    'curly': ['error', 'multi-line'],

    // require default case in switch statements
    'default-case': ['error', {'commentPattern': '^no default$'}],

    // encourages use of dot notation whenever possible
    'dot-notation': ['error', {'allowKeywords': true}],

    // enforces consistent newlines before or after dots
    // http://eslint.org/docs/rules/dot-location
    'dot-location': ['error', 'property'],

    // require the use of === and !==
    // http://eslint.org/docs/rules/eqeqeq
    'eqeqeq': ['error', 'smart'],

    // make sure for-in loops have an if statement
    'guard-for-in': 'error',

    'max-len': ["warn", 80],

    // disallow the use of alert, confirm, and prompt
    'no-alert': 'warn',

    // disallow use of arguments.caller or arguments.callee
    'no-caller': 'error',

    // disallow lexical declarations in case/default clauses
    // http://eslint.org/docs/rules/no-case-declarations.html
    'no-case-declarations': 'error',

    'no-debugger': 'warn',

    // disallow division operators explicitly at beginning of regular expression
    // http://eslint.org/docs/rules/no-div-regex
    'no-div-regex': 'off',

    // disallow else after a return in an if
    'no-else-return': 'error',

    // disallow empty functions, except for standalone funcs/arrows
    // http://eslint.org/docs/rules/no-empty-function
    'no-empty-function': ['error', {
        'allow': [
            'arrowFunctions',
            'functions',
            'methods',
        ]
    }],

    // disallow empty destructuring patterns
    // http://eslint.org/docs/rules/no-empty-pattern
    'no-empty-pattern': 'error',

    // disallow comparisons to null without a type-checking operator
    'no-eq-null': 'off',

    // disallow use of eval()
    'no-eval': 'error',

    // disallow adding to native types
    'no-extend-native': 'error',

    // disallow unnecessary function binding
    'no-extra-bind': 'error',

    // disallow Unnecessary Labels
    // http://eslint.org/docs/rules/no-extra-label
    'no-extra-label': 'error',

    // disallow fallthrough of case statements
    'no-fallthrough': 'error',

    // disallow the use of leading or trailing decimal points in numeric literals
    'no-floating-decimal': 'error',

    // disallow reassignments of native objects or read-only globals
    // http://eslint.org/docs/rules/no-global-assign
    "no-global-assign": "error",


    // disallow implicit type conversions
    // http://eslint.org/docs/rules/no-implicit-coercion
    'no-implicit-coercion': ['off', {
        'boolean': false,
        'number': true,
        'string': true,
        'allow': [],
    }],

    // disallow var and named functions in global scope
    // http://eslint.org/docs/rules/no-implicit-globals
    'no-implicit-globals': 'off',

    // disallow use of eval()-like methods
    'no-implied-eval': 'error',

    // disallow this keywords outside of classes or class-like objects
    'no-invalid-this': 'off',

    // disallow usage of __iterator__ property
    'no-iterator': 'error',

    // disallow use of labels for anything other then loops and switches
    'no-labels': ['error', {'allowLoop': false, 'allowSwitch': false}],

    // disallow unnecessary nested blocks
    'no-lone-blocks': 'error',

    // disallow creation of functions within loops
    'no-loop-func': 'error',

    // disallow magic numbers
    // http://eslint.org/docs/rules/no-magic-numbers
    'no-magic-numbers': ['off', {
        'ignore': [],
        'ignoreArrayIndexes': true,
        'enforceConst': true,
        'detectObjects': false,
    }],

    // disallow use of multiple spaces
    'no-multi-spaces': 'error',

    // disallow use of multiline strings
    'no-multi-str': 'error',

    // disallow reassignments of native objects

    'no-native-reassign': 'off',

    // disallow use of new operator when not part of the assignment or comparison
    'no-new': 'error',

    // disallow use of new operator for Function object
    'no-new-func': 'error',

    // disallows creating new instances of String, Number, and Boolean
    'no-new-wrappers': 'error',

    // disallow use of (old style) octal literals
    'no-octal': 'error',

    // disallow use of octal escape sequences in string literals, such as
    // var foo = 'Copyright \251';
    'no-octal-escape': 'error',

    // disallow usage of __proto__ property
    'no-proto': 'error',

    // disallow declaring the same variable more then once
    'no-redeclare': 'error',

    // disallow use of assignment in return statement
    'no-return-assign': 'error',

    // disallow use of `javascript:` urls.
    'no-script-url': 'error',

    // disallow self assignment
    // http://eslint.org/docs/rules/no-self-assign
    'no-self-assign': 'error',

    // disallow comparisons where both sides are exactly the same
    'no-self-compare': 'error',

    // disallow use of comma operator
    'no-sequences': 'error',

    // restrict what can be thrown as an exception
    'no-throw-literal': 'error',

    // disallow unmodified conditions of loops
    // http://eslint.org/docs/rules/no-unmodified-loop-condition
    'no-unmodified-loop-condition': 'off',

    // disallow usage of expressions in statement position
    'no-unused-expressions': ['error', {
        'allowShortCircuit': false,
        'allowTernary': false,
    }],

    // disallow unused labels
    // http://eslint.org/docs/rules/no-unused-labels
    'no-unused-labels': 'error',

    // disallow unnecessary .call() and .apply()
    'no-useless-call': 'off',

    // disallow useless string concatenation
    // http://eslint.org/docs/rules/no-useless-concat
    'no-useless-concat': 'error',

    // disallow unnecessary string escaping
    // http://eslint.org/docs/rules/no-useless-escape
    'no-useless-escape': 'error',

    // disallow use of void operator
    // http://eslint.org/docs/rules/no-void
    'no-void': 'error',

    // disallow usage of configurable warning terms in comments: e.g. todo
    'no-warning-comments': ['off', {'terms': ['todo', 'fixme', 'xxx'], 'location': 'start'}],

    // disallow use of the with statement
    'no-with': 'error',

    // require use of the second argument for parseInt()
    'radix': 'error',

    // require immediate function invocation to be wrapped in parentheses
    // http://eslint.org/docs/rules/wrap-iife.html
    'wrap-iife': ['error', 'any'],

    // require or disallow Yoda conditions
    'yoda': 'error',
    // enforce or disallow variable initializations at definition
    'init-declarations': 'off',

    // disallow the catch clause parameter name being the same as a variable in the outer scope
    'no-catch-shadow': 'off',

    // disallow deletion of variables
    'no-delete-var': 'error',

    // disallow labels that share a name with a variable
    // http://eslint.org/docs/rules/no-label-var
    'no-label-var': 'error',

    // disallow specific globals
    'no-restricted-globals': 'off',

    // disallow declaration of variables already declared in the outer scope
    'no-shadow': 'error',

    // disallow shadowing of names such as arguments
    'no-shadow-restricted-names': 'error',

    // disallow use of undeclared variables unless mentioned in a /*global */ block
    'no-undef': 'error',

    // disallow use of undefined when initializing variables
    'no-undef-init': 'error',

    // disallow use of undefined variable
    // TODO: enable?
    'no-undefined': 'off',

    // disallow declaration of variables that are not used in the code
    'no-unused-vars': ['error', { 'vars': 'local', 'args': 'after-used' }],

    // disallow use of variables before they are defined
    'no-use-before-define': ['error', { 'functions': false }]
  }
}