.eslintrc

{
  "parser": "babel-eslint",

  "env": {
    "amd": false,
    "browser": false,
    "es6": true,
    "jasmine": false,
    "jquery": false,
    "meteor": false,
    "mocha": false,
    "node": true,
    "prototypejs": false,
    "shelljs": false
  },

  "ecmaFeatures": {
    "arrowFunctions": true,
    "binaryLiterals": false,
    "blockBindings": false,
    "classes": true,
    "defaultParams": true,
    "destructuring": true,
    "forOf": true,
    "generators": false,
    "globalReturn": false,
    "jsx": false,
    "modules": true,
    "objectLiteralComputedProperties": true,
    "objectLiteralDuplicateProperties": false,
    "objectLiteralShorthandMethods": true,
    "objectLiteralShorthandProperties": true,
    "octalLiterals": false,
    "regexUFlag": false,
    "regexYFlag": false,
    "spread": true,
    "superInFunctions": false,
    "templateStrings": true,
    "unicodeCodePointEscapes": true
  },

  "rules": {
    // Possible Errors
    "comma-dangle": [2, "never"],             // disallow or enforce trailing commas
    "no-cond-assign": [2, "except-parens"],   // disallow assignment in conditional expressions
    "no-console": 0,                          // disallow use of console (off by default in the node environment)
    "no-constant-condition": 2,               // disallow use of constant expressions in conditions
    "no-control-regex": 2,                    // disallow control characters in regular expressions
    "no-debugger": 2,                         // disallow use of debugger
    "no-dupe-args": 2,                        // disallow duplicate arguments in functions
    "no-dupe-keys": 2,                        // disallow duplicate keys when creating object literals
    "no-duplicate-case": 2,                   // disallow a duplicate case label.
    "no-empty": 2,                            // disallow empty statements
    "no-empty-character-class": 2,            // disallow the use of empty character classes in regular expressions
    "no-ex-assign": 2,                        // disallow assigning to the exception in a catch block
    "no-extra-boolean-cast": 2,               // disallow double-negation boolean casts in a boolean context
    "no-extra-parens": 2,                     // disallow unnecessary parentheses (off by default)
    "no-extra-semi": 2,                       // disallow unnecessary semicolons
    "no-func-assign": 2,                      // disallow overwriting functions written as function declarations
    "no-inner-declarations": [2, "both"],     // disallow function or variable declarations in nested blocks
    "no-invalid-regexp": 2,                   // disallow invalid regular expression strings in the RegExp constructor
    "no-irregular-whitespace": 2,             // disallow irregular whitespace outside of strings and comments
    "no-negated-in-lhs": 2,                   // disallow negation of the left operand of an in expression
    "no-obj-calls": 2,                        // disallow the use of object properties of the global object (Math and JSON) as functions
    "no-regex-spaces": 2,                     // disallow multiple spaces in a regular expression literal
    "no-reserved-keys": 0,                    // disallow reserved words being used as object literal keys (off by default)
    "no-sparse-arrays": 2,                    // disallow sparse arrays
    "no-unreachable": 2,                      // disallow unreachable statements after a return, throw, continue, or break statement
    "use-isnan": 2,                           // disallow comparisons with the value NaN
    "valid-jsdoc": 0,                         // ensure JSDoc comments are valid (off by default)
    "valid-typeof": 2,                        // ensure that the results of typeof are compared against a valid string

    // Best Practices
    "block-scoped-var": 0,                    // treat var statements as if they were block scoped (off by default)
    "complexity": 2,                          // specify the maximum cyclomatic complexity allowed in a program (off by default)
    "consistent-return": 2,                   // require return statements to either always or never specify values
    "curly": [2, "multi-line"],               // specify curly brace conventions for all control statements
    "default-case": 2,                        // require default case in switch statements (off by default)
    "dot-notation": [2, {                     // encourages use of dot notation whenever possible
      "allowKeywords": true,
      "allowPattern": "^[a-z]+([_-][a-z]+)+$"
    }],
    "eqeqeq": 2,                              // require the use of === and !==
    "guard-for-in": 2,                        // make sure for-in loops have an if statement (off by default)
    "no-alert": 2,                            // disallow the use of alert, confirm, and prompt
    "no-caller": 2,                           // disallow use of arguments.caller or arguments.callee
    "no-div-regex": 2,                        // disallow division operators explicitly at beginning of regular expression (off by default)
    "no-else-return": 2,                      // disallow else after a return in an if (off by default)
    "no-empty-label": 2,                      // disallow use of labels for anything other then loops and switches
    "no-eq-null": 0,                          // disallow comparisons to null without a type-checking operator (off by default)
    "no-eval": 2,                             // disallow use of eval()
    "no-extend-native": 2,                    // disallow adding to native types
    "no-extra-bind": 2,                       // disallow unnecessary function binding
    "no-fallthrough": 2,                      // disallow fallthrough of case statements
    "no-floating-decimal": 2,                 // disallow the use of leading or trailing decimal points in numeric literals (off by default)
    "no-implied-eval": 2,                     // disallow use of eval()-like methods
    "no-iterator": 2,                         // disallow usage of __iterator__ property
    "no-labels": 0,                           // disallow use of labeled statements
    "no-lone-blocks": 2,                      // disallow unnecessary nested blocks
    "no-loop-func": 2,                        // disallow creation of functions within loops
    "no-multi-spaces": 2,                     // disallow use of multiple spaces
    "no-multi-str": 2,                        // disallow use of multiline strings
    "no-native-reassign": 2,                  // disallow reassignments of native objects
    "no-new": 2,                              // disallow use of new operator when not part of the assignment or comparison
    "no-new-func": 2,                         // disallow use of new operator for Function object
    "no-new-wrappers": 2,                     // disallow creating new instances of String, Number, and Boolean
    "no-octal": 2,                            // disallow use of octal literals
    "no-octal-escape": 2,                     // disallow use of octal escape sequences in string literals, such as var foo = "Copyright \251";
    "no-param-reassign": 0,                   // disallow reassignment of function parameters (off by default)
    "no-process-env": 2,                      // disallow use of process.env (off by default)
    "no-proto": 2,                            // disallow usage of __proto__ property
    "no-redeclare": 2,                        // disallow declaring the same variable more then once
    "no-return-assign": 0,                    // disallow use of assignment in return statement
    "no-script-url": 0,                       // disallow use of javascript: urls.
    "no-self-compare": 2,                     // disallow comparisons where both sides are exactly the same (off by default)
    "no-sequences": 2,                        // disallow use of comma operator
    "no-throw-literal": 2,                    // restrict what can be thrown as an exception (off by default)
    "no-unused-expressions": 2,               // disallow usage of expressions in statement position
    "no-void": 2,                             // disallow use of void operator (off by default)
    "no-warning-comments": 1,                 // disallow usage of configurable warning terms in comments": 0, // e.g. TODO or FIXME (off by default)
    "no-with": 2,                             // disallow use of the with statement
    "radix": 0,                               // require use of the second argument for parseInt() (off by default)
    "vars-on-top": 0,                         // require to declare all vars on top of their containing scope (off by default)
    "wrap-iife": [2, "inside"],               // require immediate function invocation to be wrapped in parentheses (off by default)
    "yoda": 0,                                // require or disallow Yoda conditions

    // Strict mode
    "strict": [1, "global"],                  // controls location of Use Strict Directives

    // Variables
    "no-catch-shadow": 2,                     // disallow the catch clause parameter name being the same as a variable in the outer scope (off by default in the node environment)
    "no-delete-var": 2,                       // disallow deletion of variables
    "no-label-var": 2,                        // disallow labels that share a name with a variable
    "no-shadow": 2,                           // disallow declaration of variables already declared in the outer scope
    "no-shadow-restricted-names": 2,          // disallow shadowing of names such as arguments
    "no-undef": 2,                            // disallow use of undeclared variables unless mentioned in a /*global */ block
    "no-undef-init": 2,                       // disallow use of undefined when initializing variables
    "no-undefined": 0,                        // disallow use of undefined variable (off by default)
    "no-unused-vars": [2, {                   // disallow declaration of variables that are not used in the code
      "vars": "all",
      "args": "after-used"
    }],
    "no-use-before-define": 2,                // disallow use of variables before they are defined

    // Node.js
    "handle-callback-err": 2,                 // enforce error handling in callbacks (off by default) (on by default in the node environment)
    "no-mixed-requires": 0,                   // disallow mixing regular variable and require declarations (off by default) (on by default in the node environment)
    "no-new-require": 2,                      // disallow use of new operator with the require function (off by default) (on by default in the node environment)
    "no-path-concat": 2,                      // disallow string concatenation with __dirname and __filename (off by default) (on by default in the node environment)
    "no-process-exit": 0,                     // disallow process.exit() (on by default in the node environment)
    "no-restricted-modules": 0,               // restrict usage of specified node modules (off by default)
    "no-sync": 0,                             // disallow use of synchronous methods (off by default)

    // Style
    "indent": [2, "tab", {                    // this option sets a specific tab width for your code (off by default)
      "SwitchCase": 1
    }],
    "brace-style": [2, "stroustrup"],         // enforce one true brace style (off by default)
    "camelcase": [2, {                        // require camel case names
      "properties": "always"
    }],
    "comma-spacing": [2, {                    // enforce spacing before and after comma
      "before": false,
      "after": true
    }],
    "comma-style": [2, "last"],               // enforce one true comma style (off by default)
    "consistent-this": [0, "self"],           // enforce consistent naming when capturing the current execution context (off by default)
    "eol-last": 2,                            // enforce newline at the end of file, with no multiple empty lines
    "func-names": 0,                          // require function expressions to have a name (off by default)
    "func-style": [2, "declaration"],         // enforce use of function declarations or expressions (off by default)
    "key-spacing": [2, {                      // enforce spacing between keys and values in object literal properties
      "beforeColon": false,
      "afterColon": true
    }],
    "max-nested-callbacks": [2, 4],           // specify the maximum depth callbacks can be nested (off by default)
    "new-cap": 2,                             // require a capital letter for constructors
    "new-parens": 2,                          // disallow the omission of parentheses when invoking a constructor with no arguments
    "newline-after-var": [2, "always"],       // allow/disallow an empty newline after var statement (off by default)
    "no-array-constructor": 2,                // disallow use of the Array constructor
    "no-continue": 0,                         // disallow use of the continue statement (off by default)
    "no-extra-parens": 2,                     // disallow wrapping of non-IIFE statements in parens
    "no-inline-comments": 0,                  // disallow comments inline after code (off by default)
    "no-lonely-if": 2,                        // disallow if as the only statement in an else block (off by default)
    "no-mixed-spaces-and-tabs": 2,            // disallow mixed spaces and tabs for indentation
    "no-multiple-empty-lines": [2, {          // disallow multiple empty lines (off by default)
      "max": 1
    }],
    "no-nested-ternary": 2,                   // disallow nested ternary expressions (off by default)
    "no-new-object": 2,                       // disallow use of the Object constructor
    "no-spaced-func": 2,                      // disallow space between function identifier and application
    "no-ternary": 0,                          // disallow the use of ternary operators (off by default)
    "no-trailing-spaces": 2,                  // disallow trailing whitespace at the end of lines
    "no-underscore-dangle": 0,                // disallow dangling underscores in identifiers
    "one-var": [2, "always"],                 // allow or disallow one variable declaration per function (off by default)
    "operator-assignment": [2, "always"],     // require assignment operator shorthand where possible or prohibit it entirely (off by default)
    "operator-linebreak": [2, "before"],      // enforce operators to be placed before or after line breaks (off by default)
    "padded-blocks": [2, "never"],            // enforce padding within blocks (off by default)
    "quote-props": [2, "as-needed"],          // require quotes around object literal property names (off by default)
    "quotes": [2, "single", "avoid-escape"],  // specify whether backticks, double or single quotes should be used
    "semi": [2, "always"],                    // require or disallow use of semicolons instead of ASI
    "semi-spacing": [2, {                     // enforce spacing before and after semicolons
      "before": false,
      "after": true
    }],
    "sort-vars": 0,                           // sort variables within the same declaration block (off by default)
    "space-after-keywords": [2, "always"],    // require a space after certain keywords (off by default)
    "space-before-blocks": [2, "always"],     // require or disallow space before blocks (off by default)
    "space-before-function-paren": [2, {      // require or disallow space before function opening parenthesis (off by default)
      "anonymous": "always",
      "named": "never"
    }],
    "space-in-brackets": 0,                   // require or disallow spaces inside brackets (off by default)
    "space-in-parens": [2, "never"],          // require or disallow spaces inside parentheses (off by default)
    "space-infix-ops": 2,                     // require spaces around operators
    "space-return-throw-case": 2,             // require a space after return, throw, and case
    "space-unary-ops": [1, {                  // Require or disallow spaces before/after unary operators (words on by default, nonwords off by default)
      "words": true,
      "nonwords": false
    }],
    "spaced-comment": [2, "always", {         // require or disallow a whitespace (space or tab) beginning a comment
      "markers": ["!", "*"]
    }],
    "wrap-regex": 2,                          // require regex literals to be wrapped in parentheses (off by default)

    // ES6
    "no-var": 0,                              // require let or const instead of var (off by default)
    "object-shorthand": [2, "methods"],       // require method and property shorthand syntax for object literals (off by default)

    // Complexity
    "max-depth": [2, 7],                      // specify the maximum depth that blocks can be nested (off by default)
    "max-len": [2, 120, 4],                   // specify the maximum length of a line in your program (off by default)
    "max-params": [2, 5],                     // limits the number of parameters that can be used in the function declaration. (off by default)
    "max-statements": [2, 50]                 // specify the maximum number of statement allowed in a function (off by default)
  }
}