.eslintrc

{
  "env": {
    "es6": false
  },
  "ecmaFeatures": {
    "arrowFunctions": true,
    "blockBindings": true,
    "classes": true,
    "defaultParams": true,
    "destructuring": true,
    "forOf": true,
    "generators": false,
    "modules": true,
    "objectLiteralComputedProperties": true,
    "objectLiteralDuplicateProperties": false,
    "objectLiteralShorthandMethods": true,
    "objectLiteralShorthandProperties": true,
    "restParams": true,
    "spread": true,
    "superInFunctions": true,
    "templateStrings": true,
    "jsx": true
  },
  "rules": {
    // enforces no braces where they can be omitted
    // http://eslint.org/docs/rules/arrow-body-style
    "arrow-body-style": [2, "as-needed"],
    // require parens in arrow function arguments
    "arrow-parens": 0,
    // require space before/after arrow function"s arrow
    // https://github.com/eslint/eslint/blob/master/docs/rules/arrow-spacing.md
    "arrow-spacing": [2, { "before": true, "after": true }],
    // verify super() callings in constructors
    "constructor-super": 0,
    // enforce the spacing around the * in generator functions
    "generator-star-spacing": 0,
    // disallow modifying variables of class declarations
    "no-class-assign": 0,
    // disallow modifying variables that are declared using const
    "no-const-assign": 2,
    // disallow to use this/super before super() calling in constructors.
    "no-this-before-super": 0,
    // require let or const instead of var
    "no-var": 2,
    // require method and property shorthand syntax for object literals
    // https://github.com/eslint/eslint/blob/master/docs/rules/object-shorthand.md
    "object-shorthand": [2, "always"],
    // suggest using arrow functions as callbacks
    "prefer-arrow-callback": 2,
    // suggest using of const declaration for variables that are never modified after declared
    "prefer-const": 2,
    // suggest using the spread operator instead of .apply()
    "prefer-spread": 0,
    // suggest using Reflect methods where applicable
    "prefer-reflect": 0,
    // suggest using template literals instead of string concatenation
    // http://eslint.org/docs/rules/prefer-template
    "prefer-template": 2,
    // disallow generator functions that do not have yield
    "require-yield": 0,
    //LEGACY
    // specify the maximum depth that blocks can be nested
    "max-depth": [0, 4],
    // limits the number of parameters that can be used in the function declaration.
    "max-params": [0, 3],
    // specify the maximum number of statement allowed in a function
    "max-statements": [0, 10],
    // disallow use of bitwise operators
    "no-bitwise": 0,
    // disallow use of unary operators, ++ and --
    "no-plusplus": 0,
    //BEST PRACTICIES
    // enforces getter/setter pairs in objects
    "accessor-pairs": 0,
    // treat var statements as if they were block scoped
    "block-scoped-var": 2,
    // specify the maximum cyclomatic complexity allowed in a program
    "complexity": [0, 11],
    // require return statements to either always or never specify values
    "consistent-return": 2,
    // specify curly brace conventions for all control statements
    "curly": [2, "multi-line"],
    // require default case in switch statements
    "default-case": 2,
    // encourages use of dot notation whenever possible
    "dot-notation": [2, { "allowKeywords": true }],
    // enforces consistent newlines before or after dots
    "dot-location": 0,
    // require the use of === and !==
    "eqeqeq": 2,
    // make sure for-in loops have an if statement
    "guard-for-in": 2,
    // disallow the use of alert, confirm, and prompt
    "no-alert": 1,
    // disallow use of arguments.caller or arguments.callee
    "no-caller": 2,
    // disallow division operators explicitly at beginning of regular expression
    "no-div-regex": 0,
    // disallow else after a return in an if
    "no-else-return": 2,
    // disallow use of labels for anything other then loops and switches
    "no-empty-label": 2,
    // disallow comparisons to null without a type-checking operator
    "no-eq-null": 0,
    // disallow use of eval()
    "no-eval": 2,
    // disallow adding to native types
    "no-extend-native": 2,
    // disallow unnecessary function binding
    "no-extra-bind": 2,
    // disallow fallthrough of case statements
    "no-fallthrough": 2,
    // disallow the use of leading or trailing decimal points in numeric literals
    "no-floating-decimal": 2,
    // disallow the type conversions with shorter notations
    "no-implicit-coercion": 0,
    // disallow use of eval()-like methods
    "no-implied-eval": 2,
    // disallow this keywords outside of classes or class-like objects
    "no-invalid-this": 0,
    // disallow usage of __iterator__ property
    "no-iterator": 2,
    // disallow use of labeled statements
    "no-labels": 2,
    // disallow unnecessary nested blocks
    "no-lone-blocks": 2,
    // disallow creation of functions within loops
    "no-loop-func": 2,
    // disallow use of multiple spaces
    "no-multi-spaces": 2,
    // disallow use of multiline strings
    "no-multi-str": 2,
    // disallow reassignments of native objects
    "no-native-reassign": 2,
    // disallow use of new operator when not part of the assignment or comparison
    "no-new": 2,
    // disallow use of new operator for Function object
    "no-new-func": 2,
    // disallows creating new instances of String,Number, and Boolean
    "no-new-wrappers": 2,
    // disallow use of (old style) octal literals
    "no-octal": 2,
    // disallow use of octal escape sequences in string literals, such as
    // var foo = "Copyright \251";
    "no-octal-escape": 2,
    // disallow reassignment of function parameters
    // disallow parameter object manipulation
    // rule: http://eslint.org/docs/rules/no-param-reassign.html
    "no-param-reassign": [2, { "props": true }],
    // disallow use of process.env
    "no-process-env": 0,
    // disallow usage of __proto__ property
    "no-proto": 2,
    // disallow declaring the same variable more then once
    "no-redeclare": 2,
    // disallow use of assignment in return statement
    "no-return-assign": 2,
    // disallow use of `javascript:` urls.
    "no-script-url": 2,
    // disallow comparisons where both sides are exactly the same
    "no-self-compare": 2,
    // disallow use of comma operator
    "no-sequences": 2,
    // restrict what can be thrown as an exception
    "no-throw-literal": 2,
    // disallow usage of expressions in statement position
    "no-unused-expressions": 2,
    // disallow unnecessary .call() and .apply()
    "no-useless-call": 0,
    // disallow use of void operator
    "no-void": 0,
    // disallow usage of configurable warning terms in comments: e.g. todo
    "no-warning-comments": [0, { "terms": ["todo", "fixme", "xxx"], "location": "start" }],
    // disallow use of the with statement
    "no-with": 2,
    // require use of the second argument for parseInt()
    "radix": 2,
    // requires to declare all vars on top of their containing scope
    "vars-on-top": 2,
    // require immediate function invocation to be wrapped in parentheses
    // http://eslint.org/docs/rules/wrap-iife.html
    "wrap-iife": [2, "outside"],
    // require or disallow Yoda conditions
    "yoda": 2,
    // enforce spacing inside array brackets
    "array-bracket-spacing": [2, "never"],
    // enforce one true brace style
    "brace-style": [2, "1tbs", { "allowSingleLine": true }],
    // require camel case names
    "camelcase": [2, { "properties": "never" }],
    // enforce spacing before and after comma
    "comma-spacing": [2, { "before": false, "after": true }],
    // enforce one true comma style
    "comma-style": [2, "last"],
    // disallow padding inside computed properties
    "computed-property-spacing": [2, "never"],
    // enforces consistent naming when capturing the current execution context
    "consistent-this": 0,
    // enforce newline at the end of file, with no multiple empty lines
    "eol-last": 2,
    // require function expressions to have a name
    "func-names": 1,
    // enforces use of function declarations or expressions
    "func-style": 0,
    // this option enforces minimum and maximum identifier lengths
    // (variable names, property names etc.)
    "id-length": 0,
    // this option sets a specific tab width for your code
    // https://github.com/eslint/eslint/blob/master/docs/rules/indent.md
    "indent": [2, 2, { "SwitchCase": 1, "VariableDeclarator": 1 }],
    // specify whether double or single quotes should be used in JSX attributes
    // http://eslint.org/docs/rules/jsx-quotes
    "jsx-quotes": [2, "prefer-double"],
    // enforces spacing between keys and values in object literal properties
    "key-spacing": [2, { "beforeColon": false, "afterColon": true }],
    // enforces empty lines around comments
    "lines-around-comment": 0,
    // disallow mixed "LF" and "CRLF" as linebreaks
    "linebreak-style": 0,
    // specify the maximum length of a line in your program
    // https://github.com/eslint/eslint/blob/master/docs/rules/max-len.md
    "max-len": [2, 150, 2, {
      "ignoreUrls": true,
      "ignoreComments": false
    }],
    // specify the maximum depth callbacks can be nested
    "max-nested-callbacks": 0,
    // require a capital letter for constructors
    "new-cap": [2, { "newIsCap": true }],
    // disallow the omission of parentheses when invoking a constructor with no arguments
    "new-parens": 0,
    // allow/disallow an empty newline after var statement
    "newline-after-var": 0,
    // disallow use of the Array constructor
    "no-array-constructor": 0,
    // disallow use of the continue statement
    "no-continue": 0,
    // disallow comments inline after code
    "no-inline-comments": 0,
    // disallow if as the only statement in an else block
    "no-lonely-if": 0,
    // disallow mixed spaces and tabs for indentation
    "no-mixed-spaces-and-tabs": 2,
    // disallow multiple empty lines and only one newline at the end
    "no-multiple-empty-lines": [2, { "max": 2, "maxEOF": 1 }],
    // disallow nested ternary expressions
    "no-nested-ternary": 2,
    // disallow use of the Object constructor
    "no-new-object": 2,
    // disallow space between function identifier and application
    "no-spaced-func": 2,
    // disallow the use of ternary operators
    "no-ternary": 0,
    // disallow trailing whitespace at the end of lines
    "no-trailing-spaces": 2,
    // disallow dangling underscores in identifiers
    "no-underscore-dangle": 0,
    // disallow the use of Boolean literals in conditional expressions
    "no-unneeded-ternary": 0,
    // require padding inside curly braces
    "object-curly-spacing": [2, "always"],
    // allow just one var statement per function
    "one-var": [2, "never"],
    // require assignment operator shorthand where possible or prohibit it entirely
    "operator-assignment": 0,
    // enforce operators to be placed before or after line breaks
    "operator-linebreak": 0,
    // enforce padding within blocks
    "padded-blocks": [2, "never"],
    // require quotes around object literal property names
    // http://eslint.org/docs/rules/quote-props.html
    "quote-props": [2, "as-needed", { "keywords": false, "unnecessary": true, "numbers": false }],
    // specify whether double or single quotes should be used
    "quotes": [2, "single", "avoid-escape"],
    // require identifiers to match the provided regular expression
    "id-match": 0,
    // enforce spacing before and after semicolons
    "semi-spacing": [2, { "before": false, "after": true }],
    // require or disallow use of semicolons instead of ASI
    "semi": [2, "always"],
    // sort variables within the same declaration block
    "sort-vars": 0,
    // require a space before certain keywords
    "space-before-keywords": [2, "always"],
    // require a space after certain keywords
    "space-after-keywords": [2, "always"],
    // require or disallow space before blocks
    "space-before-blocks": 2,
    // require or disallow space before function opening parenthesis
    // https://github.com/eslint/eslint/blob/master/docs/rules/space-before-function-paren.md
    "space-before-function-paren": [2, { "anonymous": "always", "named": "never" }],
    // require or disallow spaces inside parentheses
    "space-in-parens": [2, "never"],
    // require spaces around operators
    "space-infix-ops": 2,
    // require a space after return, throw, and case
    "space-return-throw-case": 2,
    // Require or disallow spaces before/after unary operators
    "space-unary-ops": 0,
    // require or disallow a space immediately following the // or /* in a comment
    "spaced-comment": [2, "always", {
      "exceptions": ["-", "+"],
      "markers": ["=", "!"]           // space here to support sprockets directives
    }],
    // require regex literals to be wrapped in parentheses
    "wrap-regex": 0
  }


}