.eslintrc.json

{
  "globals": {
      // e.g. "angular": true
  },

  "plugins": [
      "babel",
      "react",
      "flowtype",
      "react-native"
      // e.g. "react" (must run `npm install eslint-plugin-react` first)
  ],

  "extends": [
      "eslint:recommended",
      "plugin:react/recommended"
  ],

  "parser": "babel-eslint",

  "env": {
      "browser": false,     // browser global variables.
      "node": false,        // Node.js global variables and Node.js-specific rules.
      "amd": false,         // defines require() and define() as global variables as per the amd spec.
      "mocha": false,       // adds all of the Mocha testing global variables.
      "jasmine": false,     // adds all of the Jasmine testing global variables for version 1.3 and 2.1.
      "phantomjs": false,   // phantomjs global variables.
      "jquery": false,      // jquery global variables.
      "prototypejs": false, // prototypejs global variables.
      "shelljs": false,     // shelljs global variables.
      "commonjs": true,
      "es6": true
  },

  "parserOptions": {
      "ecmaFeatures": {
          "binaryLiterals": false,                    // enable binary literals
          "blockBindings": false,                     // enable let and const (aka block bindings)
          "defaultParams": false,                     // enable default function parameters
          "forOf": false,                             // enable for-of loops
          "generators": false,                        // enable generators
          "objectLiteralComputedProperties": false,   // enable computed object literal property names
          "objectLiteralDuplicateProperties": false,  // enable duplicate object literal properties in strict mode
          "objectLiteralShorthandMethods": false,     // enable object literal shorthand methods
          "objectLiteralShorthandProperties": false,  // enable object literal shorthand properties
          "octalLiterals": false,                     // enable octal literals
          "regexUFlag": false,                        // enable the regular expression u flag
          "regexYFlag": false,                        // enable the regular expression y flag
          "templateStrings": false,                   // enable template strings
          "unicodeCodePointEscapes": false,           // enable code point escapes
          "jsx": true,                                // enable JSX
          "modules": true,
          "spread": true,
          "restParams": true,
          "experimentalObjectRestSpread": true
      },
      "sourceType": "module"
  },

  "rules": {
      ////////// Possible Errors //////////

      "comma-dangle": 0,         // disallow trailing commas in object literals
      "no-cond-assign": 0,          // disallow assignment in conditional expressions
      "no-console": 1,              // disallow use of console (off by default in the node environment)
      "no-constant-condition": 1,   // disallow use of constant expressions in conditions
      "no-control-regex": 1,        // disallow control characters in regular expressions
      "no-debugger": 1,             // disallow use of debugger
      "no-dupe-keys": 1,            // disallow duplicate keys when creating object literals
      "no-empty": 1,                // disallow empty statements
      "no-empty-character-class": 1,          // disallow the use of empty character classes in regular expressions
      "no-ex-assign": 1,            // disallow assigning to the exception in a catch block
      "no-extra-boolean-cast": 1,   // disallow double-negation boolean casts in a boolean context
      "no-extra-parens": 0,         // disallow unnecessary parentheses (off by default)
      "no-extra-semi": 1,           // disallow unnecessary semicolons
      "no-func-assign": 1,          // disallow overwriting functions written as function declarations
      "no-inner-declarations": 1,   // disallow function or variable declarations in nested blocks
      "no-invalid-regexp": 1,       // disallow invalid regular expression strings in the RegExp constructor
      "no-irregular-whitespace": 1, // disallow irregular whitespace outside of strings and comments
      "no-negated-in-lhs": 1,       // disallow negation of the left operand of an in expression
      "no-obj-calls": 1,            // disallow the use of object properties of the global object (Math and JSON) as functions
      "no-regex-spaces": 1,         // disallow multiple spaces in a regular expression literal
      "quote-props": 0,             // disallow reserved words being used as object literal keys (off by default)
      "no-sparse-arrays": 1,        // disallow sparse arrays
      "no-unreachable": 1,          // disallow unreachable statements after a return, throw, continue, or break statement
      "use-isnan": 1,               // disallow comparisons with the value NaN
      "valid-jsdoc": 1,             // Ensure JSDoc comments are valid (off by default)
      "valid-typeof": 1,            // Ensure that the results of typeof are compared against a valid string


      ////////// Best Practices //////////

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


      ////////// Strict Mode //////////

      "strict": 1,          // controls location of Use Strict Directives

      ////////// Variables //////////

      "no-catch-shadow": 1,             // 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": 1,               // disallow deletion of variables
      "no-label-var": 1,                // disallow labels that share a name with a variable
      "no-shadow": 1,                   // disallow declaration of variables already declared in the outer scope
      "no-shadow-restricted-names": 1,  // disallow shadowing of names such as arguments
      "no-undef": 1,                    // disallow use of undeclared variables unless mentioned in a /*global */ block
      "no-undef-init": 1,               // disallow use of undefined when initializing variables
      "no-undefined": 1,                // disallow use of undefined variable (off by default)
      "no-unused-vars": 1,              // disallow declaration of variables that are not used in the code
      "no-use-before-define": 0,        // disallow use of variables before they are defined


      ////////// Node.js //////////

      "handle-callback-err": 1,   // enforces error handling in callbacks (off by default) (on by default in the node environment)
      "no-mixed-requires": 1,     // disallow mixing regular variable and require declarations (off by default) (on by default in the node environment)
      "no-new-require": 1,        // disallow use of new operator with the require function (off by default) (on by default in the node environment)
      "no-path-concat": 1,        // disallow string concatenation with __dirname and __filename (off by default) (on by default in the node environment)
      "no-process-exit": 1,       // disallow process.exit() (on by default in the node environment)
      "no-restricted-modules": 1, // restrict usage of specified node modules (off by default)
      "no-sync": 0,               // disallow use of synchronous methods (off by default)


      ////////// Stylistic Issues //////////

      "brace-style": 1,               // enforce one true brace style (off by default)
      "camelcase": 1,                 // require camel case names
      "comma-spacing": 1,             // enforce spacing before and after comma
      "comma-style": 0,               // enforce one true comma style (off by default)
      "consistent-this": 1,           // enforces consistent naming when capturing the current execution context (off by default)
      "eol-last": 1,                  // enforce newline at the end of file, with no multiple empty lines
      "func-names": 1,                // require function expressions to have a name (off by default)
      "func-style": 1,                // enforces use of function declarations or expressions (off by default)
      "key-spacing": 1,               // enforces spacing between keys and values in object literal properties
      "max-nested-callbacks": 1,      // specify the maximum depth callbacks can be nested (off by default)
      "new-cap": 1,                   // require a capital letter for constructors
      "new-parens": 1,                // disallow the omission of parentheses when invoking a constructor with no arguments
      "no-array-constructor": 1,      // disallow use of the Array constructor
      "no-inline-comments": 0,        // disallow comments inline after code (off by default)
      "no-lonely-if": 1,              // disallow if as the only statement in an else block (off by default)
      "no-mixed-spaces-and-tabs": 1,  // disallow mixed spaces and tabs for indentation
      "no-multiple-empty-lines": 1,   // disallow multiple empty lines (off by default)
      "no-nested-ternary": 0,         // disallow nested ternary expressions (off by default)
      "no-new-object": 1,             // disallow use of the Object constructor
      "semi-spacing": 1,              // disallow space before semicolon
      "no-spaced-func": 1,            // disallow space between function identifier and application
      "no-ternary": 0,                // disallow the use of ternary operators (off by default)
      "no-trailing-spaces": 1,        // disallow trailing whitespace at the end of lines
      "no-underscore-dangle": 1,      // disallow dangling underscores in identifiers
      "one-var": 0,                   // allow just one var statement per function (off by default)
      "operator-assignment": 1,       // require assignment operator shorthand where possible or prohibit it entirely (off by default)
      "padded-blocks": 0,             // enforce padding within blocks (off by default)
      "quotes": 0,                    // specify whether double or single quotes should be used
      "semi": 0,                      // require or disallow use of semicolons instead of ASI
      "sort-vars": 0,                 // sort variables within the same declaration block (off by default)
      "space-before-function-paren": 0, // require a space after function names (off by default)
      "keyword-spacing": 1,           // require a space after certain keywords (off by default)
      "space-before-blocks": 1,       // require or disallow space before blocks (off by default)
      "object-curly-spacing": 0,      // require or disallow spaces inside brackets (off by default)
      "computed-property-spacing": 1,
      "array-bracket-spacing": 1,
      "space-in-parens": 1,           // require or disallow spaces inside parentheses (off by default)
      "space-infix-ops": 1,           // require spaces around operators
      "space-unary-ops": 1,           // Require or disallow spaces before/after unary operators (words on by default, nonwords off by default)
      "spaced-comment": 1,       // require or disallow a space immediately following the // in a line comment (off by default)
      "wrap-regex": 1,                // require regex literals to be wrapped in parentheses (off by default)


      ////////// ECMAScript 6 //////////

      "no-var": 1,          // require let or const instead of var (off by default)
      "generator-star-spacing": 1,  // enforce the position of the * in generator functions (off by default)


      ////////// Legacy //////////

      "max-depth": 0,       // specify the maximum depth that blocks can be nested (off by default)
      "max-len": 0,         // specify the maximum length of a line in your program (off by default)
      "max-params": 0,      // limits the number of parameters that can be used in the function declaration. (off by default)
      "max-statements": 0,  // specify the maximum number of statement allowed in a function (off by default)
      "no-bitwise": 0,      // disallow use of bitwise operators (off by default)
      "no-plusplus": 0,     // disallow use of unary operators, ++ and -- (off by default)

      ////////// Suggested by https://gist.github.com/cletusw/e01a85e399ab563b1236#gistcomment-1973905 //////////
      "prefer-template": 1,
      "no-mixed-operators": 0,
      "object-shorthand": 1,
      "no-param-reassign": 1,
      "no-restricted-syntax": 1,
      "no-prototype-builtins": 0,
      "no-useless-escape": 1,
      "array-callback-return": 1,
      "one-var-declaration-per-line": 1
  }
}