.eslintrc.js

module.exports = {
    "env": {
        "browser": false,
        "node": true,
        "es6": true,
        "mocha": true
    },
    "parserOptions": {
        "ecmaVersion": 2017,
        "sourceType": "script",
        "ecmaFeatures": {
            "globalReturn": true,
            "impliedStrict": false,
            "jsx": false,
        }
    },
    "extends": "eslint:recommended",
    "parser": "esprima",
    "rules": {
        //see http://eslint.org/docs/rules/ for info
        /*--====[ Possible Errors ]====--*/
        "comma-dangle": ["error", "never"],//require or disallow trailing commas
        "no-cond-assign": ["error", "always"],// disallow assignment operators in conditional expressions
        "no-console": ["off"],// disallow the use of console
        "no-constant-condition": ["error"],// disallow constant expressions in conditions
        "no-control-regex": ["error"],// disallow control characters in regular expressions
        "no-debugger": ["error"],// disallow the use of debugger
        "no-dupe-args": ["error"],// disallow duplicate arguments in function definitions
        "no-dupe-keys": ["error"],// disallow duplicate keys in object literals
        "no-duplicate-case": ["error"],// disallow duplicate case labels
        "no-empty": ["error"],// disallow empty block statements
        "no-empty-character-class": ["error"],// disallow empty character classes in regular expressions
        "no-ex-assign": ["error"],// disallow reassigning exceptions in catch clauses
        "no-extra-boolean-cast": ["error"],// disallow unnecessary boolean casts
        "no-extra-parens": ["error"],// disallow unnecessary parentheses
        "no-extra-semi": ["error"],// disallow unnecessary semicolons
        "no-func-assign": ["error"],// disallow reassigning function declarations
        "no-inner-declarations": ["error"],// disallow function or var declarations in nested blocks
        "no-invalid-regexp": ["error"],// disallow invalid regular expression strings in RegExp constructors
        "no-irregular-whitespace": ["error"],// disallow irregular whitespace outside of strings and comments
        "no-negated-in-lhs": ["error"],// disallow negating the left operand in in expressions
        "no-obj-calls": ["error"],// disallow calling global object properties as functions
        "no-prototype-builtins": ["error"],// Disallow use of Object.prototypes builtins directly
        "no-regex-spaces": ["error"],// disallow multiple spaces in regular expression literals
        "no-sparse-arrays": ["error"],// disallow sparse arrays
        "no-unexpected-multiline": ["error"],// disallow confusing multiline expressions
        "no-unreachable": ["error"],// disallow unreachable code after return, throw, continue, and break statements
        "no-unsafe-finally": ["error"],// disallow control flow statements in finally blocks
        "use-isnan": ["error"],// require calls to isNaN() when checking for NaN
        "valid-jsdoc": ["off"],// enforce valid JSDoc comments
        "valid-typeof": ["error"],// enforce comparing typeof expressions against valid strings

        /*--====[ Best Practices ]====--*/
        "accessor-pairs": ["warn"],// enforce getter and setter pairs in objects
        "array-callback-return": ["Error"],// enforce return statements in callbacks of array methods
        "block-scoped-var": ["Error"],// enforce the use of variables within the scope they are defined
        "complexity": ["warn", 6],// enforce a maximum cyclomatic complexity allowed in a program
        "consistent-return": ["off", {"treatUndefinedAsUnspecified": true}],// require return statements to either always or never specify values
        "curly": ["error", "all"],// enforce consistent brace style for all control statements
        "default-case": ["error"],// require default cases in switch statements
        "dot-location": ["error", "property"],// enforce consistent newlines before and after dots
        "dot-notation": ["error"],// enforce dot notation whenever possible
        "eqeqeq": ["error"],// require the use of === and !==
        "guard-for-in": ["off"],// require for-in loops to include an if statement
        "no-alert": ["error"],// disallow the use of alert, confirm, and prompt
        "no-caller": ["error"],// disallow the use of arguments.caller or arguments.callee
        "no-case-declarations": ["error"],// disallow lexical declarations in case clauses
        "no-div-regex": ["error"],// disallow division operators explicitly at the beginning of regular expressions
        "no-else-return": ["warn"],// disallow else blocks after return statements in if statements
        "no-empty-function": ["error"],// disallow empty functions
        "no-empty-pattern": ["error"],// disallow empty destructuring patterns
        "no-eq-null": ["error"],// disallow null comparisons without type-checking operators
        "no-eval": ["error"],// disallow the use of eval()
        "no-extend-native": ["off"],// disallow extending native types
        "no-extra-bind": ["warn"],// disallow unnecessary calls to .bind()
        "no-extra-label": ["error"],// disallow unnecessary labels
        "no-fallthrough": ["error"],// disallow fallthrough of case statements
        "no-floating-decimal": ["error"],// disallow leading or trailing decimal points in numeric literals
        "no-implicit-coercion": ["error"],// disallow shorthand type conversions
        "no-implicit-globals": ["off"],// disallow var and named function declarations in the global scope
        "no-implied-eval": ["error"],// disallow the use of eval()-like methods
        "no-invalid-this": ["error"],// disallow this keywords outside of classes or class-like objects
        "no-iterator": ["error"],// disallow the use of the __iterator__ property
        "no-labels": ["error"],// disallow labeled statements
        "no-lone-blocks": ["error"],// disallow unnecessary nested blocks
        "no-loop-func": ["error"],// disallow function declarations and expressions inside loop statements
        "no-magic-numbers": ["off"],// disallow magic numbers
        "no-multi-spaces": ["error"],// disallow multiple spaces
        "no-multi-str": ["error"],// disallow multiline strings
        "no-native-reassign": ["error"],// disallow reassigning native objects
        "no-new": ["error"],// disallow new operators outside of assignments or comparisons
        "no-new-func": ["error"],// disallow new operators with the Function object
        "no-new-wrappers": ["error"],// disallow new operators with the String, Number, and Boolean objects
        "no-octal": ["error"],// disallow octal literals
        "no-octal-escape": ["error"],// disallow octal escape sequences in string literals
        "no-param-reassign": ["off"],// disallow reassigning function parameters
        "no-proto": ["error"],// disallow the use of the __proto__ property
        "no-redeclare": ["error"],// disallow var redeclaration
        "no-return-assign": ["error"],// disallow assignment operators in return statements
        "no-script-url": ["error"],// disallow javascript":["off"],// urls
        "no-self-assign": ["error"],// disallow assignments where both sides are exactly the same
        "no-self-compare": ["error"],// disallow comparisons where both sides are exactly the same
        "no-sequences": ["error"],// disallow comma operators
        "no-throw-literal": ["error"],// disallow throwing literals as exceptions
        "no-unmodified-loop-condition": ["error"],// disallow unmodified loop conditions
        "no-unused-expressions": ["error"],// disallow unused expressions
        "no-unused-labels": ["error"],// disallow unused labels
        "no-useless-call": ["error"],// disallow unnecessary calls to .call() and .apply()
        "no-useless-concat": ["error"],// disallow unnecessary concatenation of literals or template literals
        "no-useless-escape": ["error"],// disallow unnecessary escape characters
        "no-void": ["error"],// disallow void operators
        "no-warning-comments": ["warn"],// disallow specified warning terms in comments
        "no-with": ["error"],// disallow with statements
        "radix": ["error"],// enforce the consistent use of the radix argument when using parseInt()
        "vars-on-top": ["off"],// require var declarations be placed at the top of their containing scope
        "wrap-iife": ["error", "outside"],// require parentheses around immediate function invocations
        "yoda": ["error"],// require or disallow “Yoda” conditions


        /*--====[ Strict Mode ]====--*/
        "strict": ["error", "safe"],//require or disallow strict mode directives

        /*--====[ Variables ]====--*/
        "init-declarations": ["off"],// require or disallow initialization in var declarations
        "no-catch-shadow": ["off"],// disallow catch clause parameters from shadowing variables in the outer scope
        "no-delete-var": ["error"],// disallow deleting variables
        "no-label-var": ["error"],// disallow labels that share a name with a variable
        "no-restricted-globals": ["off"],// disallow specified global variables
        "no-shadow": ["error"],// disallow var declarations from shadowing variables in the outer scope
        "no-shadow-restricted-names": ["error"],// disallow identifiers from shadowing restricted names
        "no-undef": ["error"],// disallow the use of undeclared variables unless mentioned in /*global */ comments
        "no-undef-init": ["error"],// disallow initializing variables to undefined
        "no-undefined": ["error"],// disallow the use of undefined as an identifier
        "no-unused-vars": ["error"],// disallow unused variables
        "no-use-before-define": ["error", {"functions": false, "classes": true}],// disallow the use of variables before they are defined

        /*--====[ Node.js and CommonJS ]====--*/
        "callback-return": ["error"],// require return statements after callbacks
        "global-require": ["warn"],// require require() calls to be placed at top-level module scope
        "handle-callback-err": ["error"],// require error handling in callbacks
        "no-mixed-requires": ["off"],// disallow require calls to be mixed with regular var declarations
        "no-new-require": ["warn"],// disallow new operators with calls to require
        "no-path-concat": ["error"],// disallow string concatenation with __dirname and __filename
        "no-process-env": ["warn"],// disallow the use of process.env
        "no-process-exit": ["error"],// disallow the use of process.exit()
        "no-restricted-modules": ["off"],// disallow specified modules when loaded by require
        "no-sync": ["error"],// disallow synchronous methods

        /*--====[ Stylistic Issues ]====--*/
        "array-bracket-spacing": ["warn", "never"],// enforce consistent spacing inside array brackets
        "block-spacing": ["off"],// enforce consistent spacing inside single-line blocks
        "brace-style": ["off"],// enforce consistent brace style for blocks
        "camelcase": ["off"],// enforce camelcase naming convention
        "comma-spacing": ["off"],// enforce consistent spacing before and after commas
        "comma-style": ["off"],// enforce consistent comma style
        "computed-property-spacing": ["off"],// enforce consistent spacing inside computed property brackets
        "consistent-this": ["off"],// enforce consistent naming when capturing the current execution context
        "eol-last": ["off"],// enforce at least one newline at the end of files
        "func-names": ["off"],// enforce named function expressions
        "func-style": ["off"],// enforce the consistent use of either function declarations or expressions
        "id-blacklist": ["off"],// disallow specified identifiers
        "id-length": ["off"],// enforce minimum and maximum identifier lengths
        "id-match": ["off"],// require identifiers to match a specified regular expression
        "indent": ["error", 4, {"SwitchCase": 1}],// enforce consistent indentation
        "jsx-quotes": ["off"],// enforce the consistent use of either double or single quotes in JSX attributes
        "key-spacing": ["off"],// enforce consistent spacing between keys and values in object literal properties
        "keyword-spacing": ["off"],// enforce consistent spacing before and after keywords
        "linebreak-style": ["off", "unix"],// enforce consistent linebreak style
        "lines-around-comment": ["off"],// require empty lines around comments
        "max-depth": ["off"],// enforce a maximum depth that blocks can be nested
        "max-len": ["off"],// enforce a maximum line length
        "max-nested-callbacks": ["off"],// enforce a maximum depth that callbacks can be nested
        "max-params": ["off"],// enforce a maximum number of parameters in function definitions
        "max-statements": ["off"],// enforce a maximum number of statements allowed in function blocks
        "max-statements-per-line": ["off"],// enforce a maximum number of statements allowed per line
        "new-cap": ["off"],// require constructor function names to begin with a capital letter
        "new-parens": ["error"],// require parentheses when invoking a constructor with no arguments
        "newline-after-var": ["off"],// require or disallow an empty line after var declarations
        "newline-before-return": ["off"],// require an empty line before return statements
        "newline-per-chained-call": ["off"],// require a newline after each call in a method chain
        "no-array-constructor": ["off"],// disallow Array constructors
        "no-bitwise": ["off"],// disallow bitwise operators
        "no-continue": ["off"],// disallow continue statements
        "no-inline-comments": ["off"],// disallow inline comments after code
        "no-lonely-if": ["off"],// disallow if statements as the only statement in else blocks
        "no-mixed-spaces-and-tabs": ["off"],// disallow mixed spaces and tabs for indentation
        "no-multiple-empty-lines": ["off"],// disallow multiple empty lines
        "no-negated-condition": ["off"],// disallow negated conditions
        "no-nested-ternary": ["off"],// disallow nested ternary expressions
        "no-new-object": ["off"],// disallow Object constructors
        "no-plusplus": ["off"],// disallow the unary operators ++ and --
        "no-restricted-syntax": ["off"],// disallow specified syntax
        "no-spaced-func": ["off"],// disallow spacing between function identifiers and their applications
        "no-ternary": ["off"],// disallow ternary operators
        "no-trailing-spaces": ["off"],// disallow trailing whitespace at the end of lines
        "no-underscore-dangle": ["off"],// disallow dangling underscores in identifiers
        "no-unneeded-ternary": ["off"],// disallow ternary operators when simpler alternatives exist
        "no-whitespace-before-property": ["off"],// disallow whitespace before properties
        "object-curly-spacing": ["off"],// enforce consistent spacing inside braces
        "object-property-newline": ["off"],// enforce placing object properties on separate lines
        "one-var": ["off"],// enforce variables to be declared either together or separately in functions
        "one-var-declaration-per-line": ["off"],// require or disallow newlines around var declarations
        "operator-assignment": ["off"],// require or disallow assignment operator shorthand where possible
        "operator-linebreak": ["off"],// enforce consistent linebreak style for operators
        "padded-blocks": ["off"],// require or disallow padding within blocks
        "quote-props": ["off"],// require quotes around object literal property names
        "quotes": ["off", "single"],// enforce the consistent use of either backticks, double, or single quotes//todo turn this on once we have refactored a bit more
        "require-jsdoc": ["off"],// require JSDoc comments
        "semi": ["error", "always"],// require or disallow semicolons instead of ASI
        "semi-spacing": ["off"],// enforce consistent spacing before and after semicolons
        "sort-vars": ["off"],// require variables within the same declaration block to be sorted
        "space-before-blocks": ["off"],// enforce consistent spacing before blocks
        "space-before-function-paren": ["off"],// enforce consistent spacing before function definition opening parenthesis
        "space-in-parens": ["off"],// enforce consistent spacing inside parentheses
        "space-infix-ops": ["off"],// require spacing around operators
        "space-unary-ops": ["off"],// enforce consistent spacing before or after unary operators
        "spaced-comment": ["off"],// enforce consistent spacing after the // or /* in a comment
        "unicode-bom": ["off"],// require or disallow the Unicode BOM
        "wrap-regex": ["off"],// require parenthesis around regex literals

        /*--====[ ECMAScript 6 ]====--*/
        "arrow-body-style": ["off"],// require braces around arrow function bodies
        "arrow-parens": ["off"],// require parentheses around arrow function arguments
        "arrow-spacing": ["off"],// enforce consistent spacing before and after the arrow in arrow functions
        "constructor-super": ["off"],// require super() calls in constructors
        "generator-star-spacing": ["off"],// enforce consistent spacing around * operators in generator functions
        "no-class-assign": ["off"],// disallow reassigning class members
        "no-confusing-arrow": ["off"],// disallow arrow functions where they could be confused with comparisons
        "no-const-assign": ["off"],// disallow reassigning const variables
        "no-dupe-class-members": ["off"],// disallow duplicate class members
        "no-duplicate-imports": ["off"],// disallow duplicate module imports
        "no-new-symbol": ["off"],// disallow new operators with the Symbol object
        "no-restricted-imports": ["off"],// disallow specified modules when loaded by import
        "no-this-before-super": ["off"],// disallow this/super before calling super() in constructors
        "no-useless-computed-key": ["off"],// disallow unnecessary computed property keys in object literals
        "no-useless-constructor": ["off"],// disallow unnecessary constructors
        "no-useless-rename": ["off"],// disallow renaming import, export, and destructured assignments to the same name
        "no-var": ["warn"],// require let or const instead of var
        "object-shorthand": ["off"],// require or disallow method and property shorthand syntax for object literals
        "prefer-arrow-callback": ["off"],// require arrow functions as callbacks
        "prefer-const": ["off"],// require const declarations for variables that are never reassigned after declared
        "prefer-reflect": ["off"],// require Reflect methods where applicable
        "prefer-rest-params": ["off"],// require rest parameters instead of arguments
        "prefer-spread": ["off"],// require spread operators instead of .apply()
        "prefer-template": ["off"],// require template literals instead of string concatenation
        "require-yield": ["off"],// require generator functions to contain yield
        "sort-imports": ["off"],// enforce sorted import declarations within modules
        "template-curly-spacing": ["off"],// require or disallow spacing around embedded expressions of template strings
        "yield-star-spacing": ["off"]// require or disallow spacing around the * in yield* expressions
    }
};