.eslintrc

env:

    ###########################################################################
    #                                                                         #
    #   ENVIRONMENT: if you write code that will be executed in one of the    #
    #   following environments, the value for that environment should be      #
    #   set to true.                                                          #
    #                                                                         #
    ###########################################################################

    browser: true
    es6: true

parserOptions:
  sourceType: "module"

globals:

    ###########################################################################
    #                                                                         #
    #   GLOBALS: ESLint will assume the following variables are declared      #
    #   globally; other variables will require explicit declaration.          #
    #                                                                         #
    ###########################################################################

    require: true

rules:

    ###########################################################################
    #                                                                         #
    #   POSSIBLE ERRORS: these rules point out areas where you might have     #
    #   made mistakes.                                                        #
    #                                                                         #
    ###########################################################################

    comma-dangle: 1            # disallow trailing commas in object literals
    no-cond-assign: 0          # disallow assignment in conditional expressions
    no-console: 0              # disallow use of console
    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-keys: 2            # disallow duplicate keys when creating object literals
    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-semi: 0           # disallow unnecessary semicolons
    no-func-assign: 0          # disallow overwriting functions written as function declarations
    no-inner-declarations: 1   # 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: 1         # disallow multiple spaces in a regular expression literal
    no-reserved-keys: 0        # disallow reserved words being used as object literal keys
    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:               # ensure JSDoc comments are valid
        [1, { "prefer": { "return": "returns" }, "requireReturn": false }]
    valid-typeof: 2            # ensure that the results of typeof are compared against a
                               #    valid string

    ###########################################################################
    #                                                                         #
    #   BEST PRACTICES: these rules are designed to prevent you from making   #
    #   mistakes. They either prescribe a better way of doing something or    #
    #   help you avoid pitfalls.                                              #
    #                                                                         #
    ###########################################################################

    block-scoped-var: 0       # treat var statements as if they were block scoped
    complexity: [1, 250]      # specify the maximum cyclomatic complexity allowed in a program
    consistent-return: 0      # require return statements to either always or never specify values
    curly: 0                  # specify curly brace conventions for all control
                              #     statements
    default-case: 2           # require default case in switch statements
    dot-notation: 1           # encourages use of dot notation whenever possible
    eqeqeq: 0                 # require the use of === and !==
    guard-for-in: 1           # make sure for-in loops have an if statement
    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: 0           # disallow division operators explicitly at beginning of regular
                              #    expression
    no-else-return: 0         # disallow else after a return in an if
    no-eq-null: 0             # disallow comparisons to null without a type-checking operator
    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
    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: 0           # disallow creation of functions within loops
    no-multi-spaces: 0        # 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: 0            # disallow use of new operator for Function object
    no-new-wrappers: 2        # disallows creating new instances of String,Number, and Boolean
    no-octal: 0               # disallow use of octal literals
    no-octal-escape: 0        # disallow use of octal escape sequences in string literals, such as
                              #    `var foo = "Copyright \251"`
    no-process-env: 0         # disallow use of process.env
    no-proto: 2               # disallow usage of __proto__ property
    no-redeclare: 1           # disallow declaring the same variable more then once
    no-return-assign: 0       # 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
    no-sequences: 2           # disallow use of comma operator
    no-unused-expressions: 0  # disallow usage of expressions in statement position
    no-void: 2                # disallow use of void operator
    no-warning-comments: 0    # disallow usage of configurable warning terms in comments - e.g.
                              #     TODO or FIXME
    no-with: 2                # disallow use of the with statement
    radix: 2                  # require use of the second argument for parseInt()
    vars-on-top: 0            # requires to declare all vars on top of their containing scope
    wrap-iife: [2, "inside"]  # require immediate function invocation to be wrapped in parentheses
    yoda: [2, "never"]             # require or disallow Yoda conditions

    ###########################################################################
    #                                                                         #
    #   STRICT MODE: these rules relate to using strict mode.                 #
    #                                                                         #
    ###########################################################################

    strict: [2, "never"]           # require that all functions are run in strict mode

    ###########################################################################
    #                                                                         #
    #   VARIABLES: these rules have to do with variable declarations.         #
    #                                                                         #
    ###########################################################################

    no-catch-shadow: 2             # disallow the catch clause parameter name being the same as a
                                   #    variable in the outer scope
    no-delete-var: 2               # disallow deletion of variables
    no-label-var: 2                # disallow labels that share a name with a variable
    no-shadow: 0                   # disallow declaration of variables already declared in the
                                   #    outer scope
    no-shadow-restricted-names: 2  # disallow shadowing of names such as arguments
    no-undef: 0                    # 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
    no-unused-vars: 0              # 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: these rules relate to functionality provided in Node.js.        #
    #                                                                         #
    ###########################################################################

    handle-callback-err: 0        # enforces error handling in callbacks
    no-mixed-requires: 0          # disallow mixing regular variable and require declarations
    no-new-require: 2             # disallow use of new operator with the require function
    no-path-concat: 2             # disallow string concatenation with __dirname and __filename
    no-process-exit: 0            # disallow process.exit()
    no-restricted-modules: 0      # restrict usage of specified node modules
    no-sync: 0                    # disallow use of synchronous methods

    ###########################################################################
    #                                                                         #
    #   STYLISTIC ISSUES: these rules are purely matters of style and,        #
    #   while valueable to enforce consistently across a project, are         #
    #   quite subjective.                                                     #
    #                                                                         #
    ###########################################################################

    indent: [2, 2]                 # Set a specific tab width
    brace-style: 0                 # enforce one true brace style
    camelcase: [2, properties: "always" ]       # require camel case names
    comma-spacing: 2               # enforce spacing before and after comma
    comma-style: 2                 # enforce one true comma style
    consistent-this: 0             # enforces consistent naming when capturing the current execution context
    eol-last: 0                    # enforce newline at the end of file, with no multiple empty lines
    func-names: 0                  # require function expressions to have a name
    func-style: 0                  # enforces use of function declarations or expressions
    key-spacing: 2                 # enforces spacing between keys and values in object literal properties
    max-nested-callbacks: [2, 4]   # specify the maximum depth callbacks can be nested
    new-cap: 0                     # require a capital letter for constructors
    new-parens: 2                  # disallow the omission of parentheses when invoking a constructor with no arguments
    no-array-constructor: 2        # disallow use of the Array constructor
    no-lonely-if: 0                # disallow if as the only statement in an else block
    no-mixed-spaces-and-tabs: 2    # disallow mixed spaces and tabs for indentation
    no-nested-ternary: 0           # disallow nested ternary expressions
    no-new-object: 1               # disallow use of the Object constructor
    no-space-before-semi: 0        # disallow space before semicolon
    no-spaced-func: 2              # disallow space between function identifier and application
    no-ternary: 0                  # disallow the use of ternary operators

    no-trailing-spaces: 2          # disallow trailing whitespace at the end of lines
    no-multiple-empty-lines: 0     # disallow multiple empty lines
    no-underscore-dangle: 0        # disallow dangling underscores in identifiers
    no-extra-parens: 2             # disallow wrapping of non-IIFE statements in parens
    one-var: 0                     # allow just one var statement per function
    padded-blocks: 0               # enforce padding within blocks
    quotes:                        # specify whether double or single quotes should be used
        [1, "single", "avoid-escape"]
    quote-props: 0                 # require quotes around object literal property names
    semi: [2, "never"]             # require or disallow use of semicolons instead of ASI
    semi-spacing: 0
    sort-vars: 0                   # sort variables within the same declaration block
    keyword-spacing: 2            # require a space after certain keywords
    space-before-blocks: 2         # require or disallow space before blocks
    space-in-brackets: 0           # require or disallow spaces inside brackets
    space-in-parens: 0             # require or disallow spaces inside parentheses
    space-infix-ops: 0             # require spaces around operators
    spaced-line-comment: 0         # require or disallow a space immediately following
                                   #    the // in a line comment
    wrap-regex: 0                  # require regex literals to be wrapped in parentheses