.eslintrc

//Edited on July 5th 2015
{
  "env": {
    "browser": true,
    "node": true
  },
  "plugins": [
    "react"
  ],
  "ecmaFeatures": {
    "arrowFunctions": true, //enable arrow functions
    "binaryLiterals": false, //disable binary literals
    "blockBindings": true, //enable let and const (aka block bindings)
    "classes": true, //enable classes
    "defaultParams": true, //enable default function parameters
    "destructuring": true, //enable destructuring
    "forOf": true, //enable for-of loops
    "generators": true, //enable generators
    "modules": true, //enable modules and global strict mode
    "objectLiteralComputedProperties": true, //enable computed object literal property names
    "objectLiteralDuplicateProperties": false, //enable duplicate object literal properties in strict mode
    "objectLiteralShorthandMethods": true, //enable object literal shorthand methods
    "objectLiteralShorthandProperties": true, //enable object literal shorthand properties
    "octalLiterals": true, //enable octal literals
    "regexUFlag": false, //enable the regular expression u flag
    "regexYFlag": false, //enable the regular expression y flag
    "restParams": true, //enable the rest parameters
    "spread": true, //enable the spread operator
    "superInFunctions": true, //enable super references inside of functions
    "templateStrings": true, //enable template strings
    "unicodeCodePointEscapes": false, //enable code point escapes
    "globalReturn": false, //allow return statements in the global scope
    "jsx": true //allow jsx
  },
  "rules": { //0 = off, 1 = warning, 2 = error
    "comma-dangle": [2, "always-multiline"], //disallow or enforce trailing commas
    "no-cond-assign": 2, //disallow assignment in conditional expressions
    "no-console": 2, //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-character-class": 2, //disallow the use of empty character classes in regular expressions
    "no-empty": 2, //disallow empty statements
    "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": 0, //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, //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": 2, //Ensure JSDoc comments are valid (off by default)
    "valid-typeof": 2, //Ensure that the results of typeof are compared against a valid string
    "no-unexpected-multiline": 2, //Avoid code that looks like two expressions but is actually one (off by default)
    "accessor-pairs": 2, //Enforces getter/setter pairs in objects (off by default)
    "block-scoped-var": 2, //treat var statements as if they were block scoped (off by default)
    "complexity": [1, 3], //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, "all"], //specify curly brace conventions for all control statements
    "default-case": 2, //require default case in switch statements (off by default)
    "dot-notation": [2, {"allowKeywords": true}], //encourages use of dot notation whenever possible
    "dot-location": [2, "property"], //enforces consistent newlines before or after dots (off by default)
    "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 than 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": 2, //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-func": 2, //disallow use of new operator for Function object
    "no-new-wrappers": 2, //disallows creating new instances of String,Number, and Boolean
    "no-new": 2, //disallow use of new operator when not part of the assignment or comparison
    "no-octal-escape": 2, //disallow use of octal escape sequences in string literals, such as var foo = "Copyright \251";
    "no-octal": 2, //disallow use of octal literals
    "no-param-reassign": 0, //disallow reassignment of function parameters (off by default)
    "no-process-env": 0, //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 than once
    "no-return-assign": 2, //disallow use of assignment in return statement
    "no-script-url": 2, //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": 0, //disallow usage of configurable warning terms in comments": 2, //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": 2, //requires to declare all vars on top of their containing scope (off by default)
    "wrap-iife": [2, "outside"], //require immediate function invocation to be wrapped in parentheses (off by default)
    "yoda": [2, "never"], //require or disallow Yoda conditions
    "strict": [2, "global"], //controls location of Use Strict Directives
    "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-restricted-names": 2, //disallow shadowing of names such as arguments
    "no-shadow": 2, //disallow declaration of variables already declared in the outer scope
    "no-undef-init": 2, //disallow use of undefined when initializing variables
    "no-undef": 2, //disallow use of undeclared variables unless mentioned in a /*global */ block
    "no-undefined": 2, //disallow use of undefined variable (off by default)
    "no-unused-vars": 2, //disallow declaration of variables that are not used in the code
    "no-use-before-define": 2, //disallow use of variables before they are defined
    "handle-callback-err": 2, //enforces error handling in callbacks (off by default) (on by default in the node environment)
    "no-mixed-requires": 2, //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": 2, //disallow process.exit() (on by default in the node environment)
    "no-restricted-modules": 2, //restrict usage of specified node modules (off by default)
    "no-sync": 2, //disallow use of synchronous methods (off by default)
    "array-bracket-spacing": [2, "always"], //enforce spacing inside array brackets (off by default)
    "brace-style": [2, "1tbs", { "allowSingleLine": false }], //enforce one true brace style (off by default)
    "camelcase": [2, { "properties": "always" }], //require camel case names
    "comma-spacing": [2, { "before": false, "after": true }], //enforce spacing before and after comma
    "comma-style": [2, "last"], //enforce one true comma style (off by default)
    "computed-property-spacing": [2, "never"], //require or disallow padding inside computed properties (off by default)
    "consistent-this": [2, "this"], //enforces 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": 2, //require function expressions to have a name (off by default)
    "func-style": [2, "declaration"], //enforces use of function declarations or expressions (off by default)
    "indent": [2, 2], //this option sets a specific tab width for your code (off by default)
    "key-spacing": [2, { "beforeColon": false, "afterColon": true }], //enforces spacing between keys and values in object literal properties
    "lines-around-comment": [2, {
      "beforeBlockComment": true,
      "afterBlockComment": false,
      "beforeLineComment": true,
      "afterLineComment": false
    }], //enforces empty lines around comments (off by default)
    "linebreak-style": [2, "unix"], //disallow mixed 'LF' and 'CRLF' as linebreaks (off by default)
    "max-nested-callbacks": [2, 2], //specify the maximum depth callbacks can be nested (off by default)
    "new-cap": [2, {"newIsCap": true, "capIsNew": true }], //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": 2, //disallow use of the continue statement (off by default)
    "no-inline-comments": 2, //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)
    "no-nested-ternary": 2, //disallow nested ternary expressions (off by default)
    "no-new-object": 2, //disallow use of the Object constructor
    "no-space-before-semi": 2, //(deprecated) disallow space before semicolon (off by default)
    "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
    "no-unneeded-ternary": 2, //disallow the use of Boolean literals in conditional expressions (off by default)
    "object-curly-spacing": [2, "always"], //require or disallow padding inside curly braces (off by default)
    "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, "after"], //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-spacing": [2, { "before": false, "after": true }], //enforce spacing before and after semicolons
    "semi": [2, "always"], //require or disallow use of semicolons instead of ASI
    "sort-vars": 2, //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, "never"], //require or disallow space before function opening parenthesis (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": [2, { "words": true, "nonwords": false }], //Require or disallow spaces before/after unary operators (words on by default, nonwords off by default)
    "spaced-comment": [2, "always"], //require or disallow a space immediately following the // or /* in a comment (off by default)
    "wrap-regex": 2, //require regex literals to be wrapped in parentheses (off by default)
    "constructor-super": 2, //verify super() callings in constructors (off by default)
    "generator-star-spacing": [2, {"before": true, "after": false}], //enforce the spacing around the * in generator functions (off by default)
    "no-this-before-super": 2, //disallow to use this/super before super() calling in constructors. (off by default)
    "no-var": 2, //require let or const instead of var (off by default)
    "object-shorthand": [2, "always"], //require method and property shorthand syntax for object literals (off by default)
    "prefer-const": 2, //suggest using of const declaration for variables that are never modified after declared (off by default)
  }
}