.eslintrc

/**
 * This file is based on the ESLint configuration provided as part of the
 * Airbnb Javascript Guide found at https://github.com/airbnb/javascript and
 * https://github.com/airbnb/javascript/tree/master/packages/eslint-config-airbnb-base.
 * The configuraion is released under an MIT License which can be found at
 * https://github.com/airbnb/javascript/blob/master/packages/eslint-config-airbnb-base/LICENSE.md.
 *
 * The original configuration has been modified to support this application and
 * was used as a starting point for this ESLint configuration.
 *
 * The copyright of the original work is reproduced here per the license:
 *
 * Copyright (c) 2012 Airbnb
 *
 * Changes and derivative work all covered by the LICENSE.md file at the root of
 * this project.
 */

{
  "parserOptions": {
    "ecmaVersion": 2017,
    "sourceType": "module",
    "ecmaFeatures": {
      "generators": false,
      "objectLiteralDuplicateProperties": false,
      "jsx": true
    }
  },

  "env": {
    "es6": true,
    "node": true,
    "mocha": true,
    "browser": true,
    "jquery": true
  },

  "globals": {
    "M": false
  },

  "rules": {

    ////////////////////////////////////////////////////////////////////////////
    /// ES6
    ////////////////////////////////////////////////////////////////////////////

    // enforces no braces where they can be omitted
    // https://eslint.org/docs/rules/arrow-body-style
    "arrow-body-style": ["warn", "as-needed", {
      "requireReturnForObjectLiteral": false
    }],

    // require parens in arrow function arguments
    // https://eslint.org/docs/rules/arrow-parens
    "arrow-parens": ["off", "as-needed", {
      "requireForBlockBody": true
    }],

    // require space before/after arrow function"s arrow
    // https://eslint.org/docs/rules/arrow-spacing
    "arrow-spacing": ["error", { "before": true, "after": true }],

    // verify super() callings in constructors
    "constructor-super": "error",

    // enforce the spacing around the * in generator functions
    // https://eslint.org/docs/rules/generator-star-spacing
    "generator-star-spacing": ["error", { "before": false, "after": true }],

    // disallow modifying variables of class declarations
    // https://eslint.org/docs/rules/no-class-assign
    "no-class-assign": "error",

    // disallow arrow functions where they could be confused with comparisons
    // https://eslint.org/docs/rules/no-confusing-arrow
    "no-confusing-arrow": ["error", {
      "allowParens": true
    }],

    // disallow modifying variables that are declared using const
    "no-const-assign": "error",

    // disallow duplicate class members
    // https://eslint.org/docs/rules/no-dupe-class-members
    "no-dupe-class-members": "error",

    // disallow importing from the same path more than once
    // https://eslint.org/docs/rules/no-duplicate-imports
    // replaced by https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-duplicates.md
    "no-duplicate-imports": "off",

    // disallow symbol constructor
    // https://eslint.org/docs/rules/no-new-symbol
    "no-new-symbol": "error",

    // disallow specific imports
    // https://eslint.org/docs/rules/no-restricted-imports
    "no-restricted-imports": ["off", {
      "paths": [],
      "patterns": []
    }],

    // disallow to use this/super before super() calling in constructors.
    // https://eslint.org/docs/rules/no-this-before-super
    "no-this-before-super": "error",

    // disallow useless computed property keys
    // https://eslint.org/docs/rules/no-useless-computed-key
    "no-useless-computed-key": "error",

    // disallow unnecessary constructor
    // https://eslint.org/docs/rules/no-useless-constructor
    "no-useless-constructor": "error",

    // disallow renaming import, export, and destructured assignments to the same name
    // https://eslint.org/docs/rules/no-useless-rename
    "no-useless-rename": ["error", {
      "ignoreDestructuring": false,
      "ignoreImport": false,
      "ignoreExport": false
    }],

    // require let or const instead of var
    "no-var": "error",

    // require method and property shorthand syntax for object literals
    // https://eslint.org/docs/rules/object-shorthand
    "object-shorthand": ["error", "consistent"],

    // suggest using arrow functions as callbacks
    "prefer-arrow-callback": ["off", {
      "allowNamedFunctions": false,
      "allowUnboundThis": false
    }],

    // suggest using of const declaration for variables that are never modified after declared
    "prefer-const": ["error", {
      "destructuring": "any",
      "ignoreReadBeforeAssign": true
    }],

    // Prefer destructuring from arrays and objects
    // https://eslint.org/docs/rules/prefer-destructuring
    "prefer-destructuring": ["off", {
      "VariableDeclarator": {
        "array": false,
        "object": true
      },
      "AssignmentExpression": {
        "array": true,
        "object": true
      }
    }, {
      "enforceForRenamedProperties": false
    }],

    // disallow parseInt() in favor of binary, octal, and hexadecimal literals
    // https://eslint.org/docs/rules/prefer-numeric-literals
    "prefer-numeric-literals": "error",

    // suggest using Reflect methods where applicable
    // https://eslint.org/docs/rules/prefer-reflect
    "prefer-reflect": "off",

    // use rest parameters instead of arguments
    // https://eslint.org/docs/rules/prefer-rest-params
    "prefer-rest-params": "error",

    // suggest using the spread operator instead of .apply()
    // https://eslint.org/docs/rules/prefer-spread
    "prefer-spread": "error",

    // suggest using template literals instead of string concatenation
    // https://eslint.org/docs/rules/prefer-template
    "prefer-template": "error",

    // disallow generator functions that do not have yield
    // https://eslint.org/docs/rules/require-yield
    "require-yield": "error",

    // enforce spacing between object rest-spread
    // https://eslint.org/docs/rules/rest-spread-spacing
    "rest-spread-spacing": ["error", "never"],

    // import sorting
    // https://eslint.org/docs/rules/sort-imports
    "sort-imports": ["off", {
      "ignoreCase": false,
      "ignoreMemberSort": false,
      "memberSyntaxSortOrder": ["none", "all", "multiple", "single"]
    }],

    // require a Symbol description
    // https://eslint.org/docs/rules/symbol-description
    "symbol-description": "error",

    // enforce usage of spacing in template strings
    // https://eslint.org/docs/rules/template-curly-spacing
    "template-curly-spacing": "error",

    // enforce spacing around the * in yield* expressions
    // https://eslint.org/docs/rules/yield-star-spacing
    "yield-star-spacing": ["error", "after"],


    ////////////////////////////////////////////////////////////////////////////
    /// NODE
    ////////////////////////////////////////////////////////////////////////////

    // enforce return after a callback
    "callback-return": "off",

    // require all requires be top-level
    // https://eslint.org/docs/rules/global-require
    "global-require": "error",

    // enforces error handling in callbacks (node environment)
    "handle-callback-err": "off",

    // disallow use of the Buffer() constructor
    // https://eslint.org/docs/rules/no-buffer-constructor
    "no-buffer-constructor": "error",

    // disallow mixing regular variable and require declarations
    "no-mixed-requires": ["off", false],

    // disallow use of new operator with the require function
    "no-new-require": "error",

    // disallow string concatenation with __dirname and __filename
    // https://eslint.org/docs/rules/no-path-concat
    "no-path-concat": "error",

    // disallow use of process.env
    "no-process-env": "off",

    // disallow process.exit()
    "no-process-exit": "off",

    // restrict usage of specified node modules
    "no-restricted-modules": "off",

    // disallow use of synchronous methods (off by default)
    "no-sync": "off",


    ////////////////////////////////////////////////////////////////////////////
    /// Strict
    ////////////////////////////////////////////////////////////////////////////

    "strict": ["error", "never"],


    ////////////////////////////////////////////////////////////////////////////
    /// Style
    ////////////////////////////////////////////////////////////////////////////

    // enforce line breaks after opening and before closing array brackets
    // https://eslint.org/docs/rules/array-bracket-newline
    "array-bracket-newline": ["off", "consistent"], // object option "alternative": { "multiline": true, "minItems": 3 }

    // enforce line breaks between array elements
    // https://eslint.org/docs/rules/array-element-newline
    "array-element-newline": ["off", { "multiline": true, "minItems": 3 }],

    // enforce spacing inside array brackets
    "array-bracket-spacing": ["error", "never"],

    // enforce spacing inside single-line blocks
    // https://eslint.org/docs/rules/block-spacing
    "block-spacing": ["error", "always"],

    // enforce one true brace style
    "brace-style": ["error", "stroustrup", { "allowSingleLine": true }],

    // require camel case names
    "camelcase": ["error", { "properties": "never" }],

    // enforce or disallow capitalization of the first letter of a comment
    // https://eslint.org/docs/rules/capitalized-comments
    "capitalized-comments": ["off", "never", {
      "line": {
        "ignorePattern": ".*",
        "ignoreInlineComments": true,
        "ignoreConsecutiveComments": true,
      },
      "block": {
        "ignorePattern": ".*",
        "ignoreInlineComments": true,
        "ignoreConsecutiveComments": true,
      }
    }],

    // require trailing commas in multiline object literals when set to "always-multiline"
    "comma-dangle": ["error", {
      "arrays": "never",
      "objects": "never",
      "imports": "never",
      "exports": "never",
      "functions": "never"
    }],

    // enforce spacing before and after comma
    "comma-spacing": ["error", { "before": false, "after": true }],

    // enforce one true comma style
    "comma-style": ["error", "last", {
      "exceptions": {
        "ArrayExpression": false,
        "ArrayPattern": false,
        "ArrowFunctionExpression": false,
        "CallExpression": false,
        "FunctionDeclaration": false,
        "FunctionExpression": false,
        "ImportDeclaration": false,
        "ObjectExpression": false,
        "ObjectPattern": false,
        "VariableDeclaration": false,
        "NewExpression": false,
      }
    }],

    // disallow padding inside computed properties
    "computed-property-spacing": ["error", "never"],

    // enforces consistent naming when capturing the current execution context
    "consistent-this": "off",

    // enforce newline at the end of file, with no multiple empty lines
    "eol-last": ["error", "always"],

    // enforce spacing between functions and their invocations
    // https://eslint.org/docs/rules/func-call-spacing
    "func-call-spacing": ["error", "never"],

    // requires function names to match the name of the variable or property to which they are
    // assigned
    // https://eslint.org/docs/rules/func-name-matching
    "func-name-matching": ["off", "always", {
      "includeCommonJSModuleExports": false
    }],

    // require function expressions to have a name
    // https://eslint.org/docs/rules/func-names
    "func-names": "off",

    // enforces use of function declarations or expressions
    // https://eslint.org/docs/rules/func-style
    "func-style": ["off", "expression"],

    // enforce consistent line breaks inside function parentheses
    // https://eslint.org/docs/rules/function-paren-newline
    "function-paren-newline": ["error", "consistent"],

    // Blacklist certain identifiers to prevent them being used
    // https://eslint.org/docs/rules/id-blacklist
    "id-blacklist": "off",

    // this option enforces minimum and maximum identifier lengths
    // (variable names, property names etc.)
    "id-length": "off",

    // require identifiers to match the provided regular expression
    "id-match": "off",

    // Enforce the location of arrow function bodies with implicit returns
    // https://eslint.org/docs/rules/implicit-arrow-linebreak
    "implicit-arrow-linebreak": ["error", "beside"],

    // this option sets a specific tab width for your code
    // https://eslint.org/docs/rules/indent
    "indent": ["error", 2, {
      "SwitchCase": 1,
      "VariableDeclarator": 1,
      "outerIIFEBody": 1,
      "MemberExpression": 0,
      "FunctionDeclaration": {
        "parameters": 1,
        "body": 1
      },
      "FunctionExpression": {
        "parameters": 1,
        "body": 1
      },
      "CallExpression": {
        "arguments": 1
      },
      "ArrayExpression": 1,
      "ObjectExpression": 1,
      "ImportDeclaration": 1,
      "flatTernaryExpressions": false,
      // list derived from https://github.com/benjamn/ast-types/blob/HEAD/def/jsx.js
      "ignoredNodes": [
        "JSXElement", "JSXElement > *",
        "JSXAttribute",
        "JSXIdentifier",
        "JSXNamespacedName",
        "JSXMemberExpression",
        "JSXSpreadAttribute",
        "JSXExpressionContainer",
        "JSXOpeningElement",
        "JSXClosingElement",
        "JSXText",
        "JSXEmptyExpression",
        "JSXSpreadChild"
      ],
      "ignoreComments": false
    }],

    // specify whether double or single quotes should be used in JSX attributes
    // https://eslint.org/docs/rules/jsx-quotes
    "jsx-quotes": ["off", "prefer-double"],

    // enforces spacing between keys and values in object literal properties
    "key-spacing": ["error", { "beforeColon": false, "afterColon": true }],

    // require a space before & after certain keywords
    "keyword-spacing": ["error", {
      "before": true,
      "after": true,
      "overrides": {
        "return": { "after": true },
        "throw": { "after": true },
        "case": { "after": true }
      }
    }],

    // enforce position of line comments
    // https://eslint.org/docs/rules/line-comment-position
    "line-comment-position": ["off", {
      "position": "above",
      "ignorePattern": "",
      "applyDefaultPatterns": true,
    }],

    // disallow mixed "LF" and "CRLF" as linebreaks
    // https://eslint.org/docs/rules/linebreak-style
    "linebreak-style": ["error", "unix"],

    // require or disallow an empty line between class members
    // https://eslint.org/docs/rules/lines-between-class-members
    "lines-between-class-members": ["error", "always", { "exceptAfterSingleLine": false }],

    // enforces empty lines around comments
    "lines-around-comment": ["error", {
      "beforeBlockComment": false, // requires an empty line before block comments
      "afterBlockComment": false,  // requires an empty line after block comments
      "beforeLineComment": false,  // requires an empty line before line comments
      "afterLineComment": false,   // requires an empty line after line comments
      "allowBlockStart": true,     // allows comments to appear at the start of block statements
      "allowBlockEnd": true,       // allows comments to appear at the end of block statements
      "allowObjectStart": true,    // allows comments to appear at the start of object literals
      "allowObjectEnd": true,      // allows comments to appear at the end of object literals
      "allowArrayStart": true,     // allows comments to appear at the start of array literals
      "allowArrayEnd": true,       // allows comments to appear at the end of array literals
      "allowClassStart": true,     // allows comments to appear at the start of classes
      "allowClassEnd": true        // allows comments to appear at the end of classes

    }],

    // require or disallow newlines around directives
    // https://eslint.org/docs/rules/lines-around-directive
    "lines-around-directive": ["error", {
      "before": "always",
      "after": "always",
    }],

    // specify the maximum depth that blocks can be nested
    "max-depth": ["off", 4],

    // specify the maximum length of a line in your program
    // https://eslint.org/docs/rules/max-len
    "max-len": ["error", 100, 2, {
      "ignoreUrls": true,
      "ignoreComments": false,
      "ignoreRegExpLiterals": true,
      "ignoreStrings": true,
      "ignoreTemplateLiterals": true,
    }],

    // specify the max number of lines in a file
    // https://eslint.org/docs/rules/max-lines
    "max-lines":  ["off", {
      "max": 300,
      "skipBlankLines": true,
      "skipComments": true
    }],

    // specify the maximum depth callbacks can be nested
    "max-nested-callbacks": "off",

    // limits the number of parameters that can be used in the function declaration.
    "max-params": ["off", 3],

    // specify the maximum number of statement allowed in a function
    "max-statements": ["off", 10],

    // restrict the number of statements per line
    // https://eslint.org/docs/rules/max-statements-per-line
    "max-statements-per-line": ["off", { "max": 1 }],

    // enforce a particular style for multiline comments
    // https://eslint.org/docs/rules/multiline-comment-style
    "multiline-comment-style": ["off", "starred-block"],

    // require multiline ternary
    // https://eslint.org/docs/rules/multiline-ternary
    "multiline-ternary": ["off", "never"],

    // require a capital letter for constructors
    "new-cap": ["error", {
      "newIsCap": true,
      "newIsCapExceptions": [],
      "capIsNew": false,
      "capIsNewExceptions": ["Immutable.Map", "Immutable.Set", "Immutable.List"],
    }],

    // disallow the omission of parentheses when invoking a constructor with no arguments
    // https://eslint.org/docs/rules/new-parens
    "new-parens": "error",

    // allow/disallow an empty newline after var statement
    "newline-after-var": "off",

    // https://eslint.org/docs/rules/newline-before-return
    "newline-before-return": "off",

    // enforces new line after each method call in the chain to make it
    // more readable and easy to maintain
    // https://eslint.org/docs/rules/newline-per-chained-call
    "newline-per-chained-call": ["error", { "ignoreChainWithDepth": 4 }],

    // disallow use of the Array constructor
    "no-array-constructor": "error",

    // disallow use of bitwise operators
    // https://eslint.org/docs/rules/no-bitwise
    "no-bitwise": "error",

    // disallow use of the continue statement
    // https://eslint.org/docs/rules/no-continue
    "no-continue": "off",

    // disallow comments inline after code
    "no-inline-comments": "off",

    // disallow if as the only statement in an else block
    // https://eslint.org/docs/rules/no-lonely-if
    "no-lonely-if": "error",

    // disallow un-paren"d mixes of different operators
    // https://eslint.org/docs/rules/no-mixed-operators
    "no-mixed-operators": ["error", {
      // the list of arthmetic groups disallows mixing `%` and `**`
      // with other arithmetic operators.
      "groups": [
        ["%", "**"],
        ["%", "+"],
        ["%", "-"],
        ["%", "*"],
        ["%", "/"],
        ["**", "+"],
        ["**", "-"],
        ["**", "*"],
        ["**", "/"],
        ["&", "|", "^", "~", "<<", ">>", ">>>"],
        ["==", "!=", "===", "!==", ">", ">=", "<", "<="],
        ["&&", "||"],
        ["in", "instanceof"]
      ],
      "allowSamePrecedence": false
    }],

    // disallow mixed spaces and tabs for indentation
    "no-mixed-spaces-and-tabs": "error",

    // disallow use of chained assignment expressions
    // https://eslint.org/docs/rules/no-multi-assign
    "no-multi-assign": ["error"],

    // disallow multiple empty lines and only one newline at the end
    "no-multiple-empty-lines": ["error", { "max": 2, "maxEOF": 0 }],

    // disallow negated conditions
    // https://eslint.org/docs/rules/no-negated-condition
    "no-negated-condition": "off",

    // disallow nested ternary expressions
    "no-nested-ternary": "error",

    // disallow use of the Object constructor
    "no-new-object": "error",

    // disallow use of unary operators, ++ and --
    // https://eslint.org/docs/rules/
    "no-plusplus": "off",

    // disallow certain syntax forms
    // https://eslint.org/docs/rules/no-restricted-syntax
    "no-restricted-syntax": [
      "warn",
      {
        "selector": "ForInStatement",
        "message": "for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array.",
      },
      {
        "selector": "ForOfStatement",
        "message": "iterators/generators require regenerator-runtime, which is too heavyweight for this guide to allow them. Separately, loops should be avoided in favor of array iterations.",
      },
      {
        "selector": "LabeledStatement",
        "message": "Labels are a form of GOTO; using them makes code confusing and hard to maintain and understand.",
      },
      {
        "selector": "WithStatement",
        "message": "`with` is disallowed in strict mode because it makes code impossible to predict and optimize.",
      }
    ],

    // disallow space between function identifier and application
    "no-spaced-func": "error",

    // disallow tab characters entirely
    "no-tabs": "error",

    // disallow the use of ternary operators
    "no-ternary": "off",

    // disallow trailing whitespace at the end of lines
    "no-trailing-spaces": ["error", {
      "skipBlankLines": false,
      "ignoreComments": false,
    }],

    // disallow dangling underscores in identifiers
    "no-underscore-dangle": ["off", {
      "allow": [],
      "allowAfterThis": false,
      "allowAfterSuper": false,
      "enforceInMethodNames": false,
    }],

    // disallow the use of Boolean literals in conditional expressions
    // also, prefer `a || b` over `a ? a "": b`
    // https://eslint.org/docs/rules/no-unneeded-ternary
    "no-unneeded-ternary": ["error", { "defaultAssignment": false }],

    // disallow whitespace before properties
    // https://eslint.org/docs/rules/no-whitespace-before-property
    "no-whitespace-before-property": "error",

    // enforce the location of single-line statements
    // https://eslint.org/docs/rules/nonblock-statement-body-position
    "nonblock-statement-body-position": ["error", "beside", { "overrides": {} }],

    // require padding inside curly braces
    "object-curly-spacing": ["error", "always"],

    // enforce line breaks between braces
    // https://eslint.org/docs/rules/object-curly-newline
    "object-curly-newline": ["off", {
      "ObjectExpression": { "minProperties": 4, "multiline": true, "consistent": true },
      "ObjectPattern": { "minProperties": 4, "multiline": true, "consistent": true },
      "ImportDeclaration": { "minProperties": 4, "multiline": true, "consistent": true },
      "ExportDeclaration": { "minProperties": 4, "multiline": true, "consistent": true },
    }],

    // enforce "same line" or "multiple line" on object properties.
    // https://eslint.org/docs/rules/object-property-newline
    "object-property-newline": ["error", {
      "allowAllPropertiesOnSameLine": true,
    }],

    // allow just one var statement per function
    "one-var": ["error", "never"],

    // require a newline around variable declaration
    // https://eslint.org/docs/rules/one-var-declaration-per-line
    "one-var-declaration-per-line": ["error", "always"],

    // require assignment operator shorthand where possible or prohibit it entirely
    // https://eslint.org/docs/rules/operator-assignment
    "operator-assignment": ["error", "always"],

    // Requires operator at the beginning of the line in multiline statements
    // https://eslint.org/docs/rules/operator-linebreak
    "operator-linebreak": ["error", "before", { "overrides": { "=": "none" } }],

    // disallow padding within blocks
    "padded-blocks": ["error", {
      "blocks": "never",
      "classes": "always",
      "switches": "never"
    }],

    // Require or disallow padding lines between statements
    // https://eslint.org/docs/rules/padding-line-between-statements
    "padding-line-between-statements": "off",

    // require quotes around object literal property names
    // https://eslint.org/docs/rules/quote-props.html
    "quote-props": ["error", "as-needed", { "keywords": false, "unnecessary": true, "numbers": false }],

    // specify whether double or single quotes should be used
    "quotes": ["error", "single", { "avoidEscape": true }],

    // do not require jsdoc
    // https://eslint.org/docs/rules/require-jsdoc
    "require-jsdoc": "off",

    // require or disallow use of semicolons instead of ASI
    "semi": ["error", "always"],

    // enforce spacing before and after semicolons
    "semi-spacing": ["error", { "before": false, "after": true }],

    // Enforce location of semicolons
    // https://eslint.org/docs/rules/semi-style
    "semi-style": ["error", "last"],

    // requires object keys to be sorted
    "sort-keys": ["off", "asc", { "caseSensitive": false, "natural": true }],

    // sort variables within the same declaration block
    "sort-vars": "off",

    // require or disallow space before blocks
    "space-before-blocks": "error",

    // require or disallow space before function opening parenthesis
    // https://eslint.org/docs/rules/space-before-function-paren
    "space-before-function-paren": ["error", {
      "anonymous": "never",
      "named": "never",
      "asyncArrow": "always"
    }],

    // require or disallow spaces inside parentheses
    "space-in-parens": ["error", "never"],

    // require spaces around operators
    "space-infix-ops": "error",

    // Require or disallow spaces before/after unary operators
    // https://eslint.org/docs/rules/space-unary-ops
    "space-unary-ops": ["error", {
      "words": true,
      "nonwords": false,
      "overrides": {
      },
    }],

    // require or disallow a space immediately following the // or /* in a comment
    // https://eslint.org/docs/rules/spaced-comment
    "spaced-comment": ["error", "always", {
      "line": {
        "exceptions": ["-", "+"],
        "markers": ["=", "!"], // space here to support sprockets directives
      },
      "block": {
        "exceptions": ["-", "+", "*"],
        "markers": ["=", "!"], // space here to support sprockets directives
        "balanced": true,
      }
    }],

    // Enforce spacing around colons of switch statements
    // https://eslint.org/docs/rules/switch-colon-spacing
    "switch-colon-spacing": ["error", { "after": true, "before": false }],

    // Require or disallow spacing between template tags and their literals
    // https://eslint.org/docs/rules/template-tag-spacing
    "template-tag-spacing": ["error", "never"],

    // require or disallow the Unicode Byte Order Mark
    // https://eslint.org/docs/rules/unicode-bom
    "unicode-bom": ["error", "never"],

    // require regex literals to be wrapped in parentheses
    "wrap-regex": "off",


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

    // enforce or disallow variable initializations at definition
    "init-declarations": "off",

    // disallow the catch clause parameter name being the same as a variable in the outer scope
    "no-catch-shadow": "off",

    // disallow deletion of variables
    "no-delete-var": "error",

    // disallow labels that share a name with a variable
    // https://eslint.org/docs/rules/no-label-var
    "no-label-var": "error",

    // disallow specific globals
    // Use Number.isNaN instead of global isNaN. The global isNaN coerces
    // non-numbers to numbers, returning true for anything that coerces to NaN.
    "no-restricted-globals": ["error", "isFinite", "isNaN"],

    // disallow declaration of variables already declared in the outer scope
    "no-shadow": "error",

    // disallow shadowing of names such as arguments
    "no-shadow-restricted-names": "error",

    // disallow use of undeclared variables unless mentioned in a /*global */ block
    "no-undef": "error",

    // disallow use of undefined when initializing variables
    "no-undef-init": "error",

    // disallow use of undefined variable
    // https://eslint.org/docs/rules/no-undefined
    "no-undefined": "off",

    // disallow declaration of variables that are not used in the code
    "no-unused-vars": ["error", {
      "vars": "all",
      "args": "none",
      "ignoreRestSiblings": true
    }],

    // Disallows use of variables before they are defined
    "no-use-before-define": ["error", {
      "functions": false,
      "classes": true,
      "variables": true
    }],


    ////////////////////////////////////////////////////////////////////////////
    /// ERRORS
    ////////////////////////////////////////////////////////////////////////////

    // Enforce “for” loop update clause moving the counter in the right direction
    // https://eslint.org/docs/rules/for-direction
    "for-direction": "error",

    // Enforces that a return statement is present in property getters
    // https://eslint.org/docs/rules/getter-return
    "getter-return": ["error", { "allowImplicit": true }],

    // Disallow await inside of loops
    // https://eslint.org/docs/rules/no-await-in-loop
    "no-await-in-loop": "error",

    // Disallow comparisons to negative zero
    // https://eslint.org/docs/rules/no-compare-neg-zero
    "no-compare-neg-zero": "error",

    // disallow assignment in conditional expressions
    "no-cond-assign": ["error", "always"],

    // disallow use of console
    "no-console": "warn",

    // disallow use of constant expressions in conditions
    "no-constant-condition": "warn",

    // disallow control characters in regular expressions
    "no-control-regex": "error",

    // disallow use of debugger
    "no-debugger": "error",

    // disallow duplicate arguments in functions
    "no-dupe-args": "error",

    // disallow duplicate keys when creating object literals
    "no-dupe-keys": "error",

    // disallow a duplicate case label.
    "no-duplicate-case": "error",

    // disallow empty statements
    "no-empty": "error",

    // disallow the use of empty character classes in regular expressions
    "no-empty-character-class": "error",

    // disallow assigning to the exception in a catch block
    "no-ex-assign": "error",

    // disallow double-negation boolean casts in a boolean context
    // https://eslint.org/docs/rules/no-extra-boolean-cast
    "no-extra-boolean-cast": "error",

    // disallow unnecessary parentheses
    // https://eslint.org/docs/rules/no-extra-parens
    "no-extra-parens": ["off", "all", {
      "conditionalAssign": true,
      "nestedBinaryExpressions": false,
      "returnAssign": false,
      "ignoreJSX": "all", // delegate to eslint-plugin-react
      "enforceForArrowConditionals": false,
    }],

    // disallow unnecessary semicolons
    "no-extra-semi": "error",

    // disallow overwriting functions written as function declarations
    "no-func-assign": "error",

    // disallow function or variable declarations in nested blocks
    "no-inner-declarations": "error",

    // disallow invalid regular expression strings in the RegExp constructor
    "no-invalid-regexp": "error",

    // disallow irregular whitespace outside of strings and comments
    "no-irregular-whitespace": "error",

    // disallow the use of object properties of the global object (Math and JSON) as functions
    "no-obj-calls": "error",

    // disallow use of Object.prototypes builtins directly
    // https://eslint.org/docs/rules/no-prototype-builtins
    "no-prototype-builtins": "off",

    // disallow multiple spaces in a regular expression literal
    "no-regex-spaces": "error",

    // disallow sparse arrays
    "no-sparse-arrays": "error",

    // Disallow template literal placeholder syntax in regular strings
    // https://eslint.org/docs/rules/no-template-curly-in-string
    "no-template-curly-in-string": "error",

    // Avoid code that looks like two expressions but is actually one
    // https://eslint.org/docs/rules/no-unexpected-multiline
    "no-unexpected-multiline": "error",

    // disallow unreachable statements after a return, throw, continue, or break statement
    "no-unreachable": "error",

    // disallow return/throw/break/continue inside finally blocks
    // https://eslint.org/docs/rules/no-unsafe-finally
    "no-unsafe-finally": "error",

    // disallow negating the left operand of relational operators
    // https://eslint.org/docs/rules/no-unsafe-negation
    "no-unsafe-negation": "error",
    // disallow negation of the left operand of an in expression
    // deprecated in favor of no-unsafe-negation
    "no-negated-in-lhs": "off",

    // disallow comparisons with the value NaN
    "use-isnan": "error",

    // ensure JSDoc comments are valid
    // https://eslint.org/docs/rules/valid-jsdoc
    "valid-jsdoc": "off",

    // ensure that the results of typeof are compared against a valid string
    // https://eslint.org/docs/rules/valid-typeof
    "valid-typeof": ["error", { "requireStringLiterals": true }],


    ////////////////////////////////////////////////////////////////////////////
    /// BEST PRACTICES
    ////////////////////////////////////////////////////////////////////////////

    // enforces getter/setter pairs in objects
    "accessor-pairs": "off",

    // enforces return statements in callbacks of array"s methods
    // https://eslint.org/docs/rules/array-callback-return
    "array-callback-return": ["error", { "allowImplicit": true }],

    // treat var statements as if they were block scoped
    "block-scoped-var": "error",

    // specify the maximum cyclomatic complexity allowed in a program
    "complexity": ["off", 11],

    // enforce that class methods use "this"
    // https://eslint.org/docs/rules/class-methods-use-this
    "class-methods-use-this": ["error", {
      "exceptMethods": [
        "componentDidMount",
        "render"
      ],
    }],

    // require return statements to either always or never specify values
    "consistent-return": "off",

    // specify curly brace conventions for all control statements
    "curly": ["error", "multi-line", "consistent"],

    // require default case in switch statements
    "default-case": ["error", { "commentPattern": "^no default$" }],

    // encourages use of dot notation whenever possible
    "dot-notation": ["error", { "allowKeywords": true }],

    // enforces consistent newlines before or after dots
    // https://eslint.org/docs/rules/dot-location
    "dot-location": ["error", "property"],

    // require the use of === and !==
    // https://eslint.org/docs/rules/eqeqeq
    "eqeqeq": ["error", "always", { "null": "ignore" }],

    // make sure for-in loops have an if statement
    "guard-for-in": "error",

    // disallow the use of alert, confirm, and prompt
    "no-alert": "warn",

    // disallow use of arguments.caller or arguments.callee
    "no-caller": "error",

    // disallow lexical declarations in case/default clauses
    // https://eslint.org/docs/rules/no-case-declarations.html
    "no-case-declarations": "error",

    // disallow division operators explicitly at beginning of regular expression
    // https://eslint.org/docs/rules/no-div-regex
    "no-div-regex": "off",

    // disallow else after a return in an if
    // https://eslint.org/docs/rules/no-else-return
    "no-else-return": ["off", { "allowElseIf": false }],

    // disallow empty functions, except for standalone funcs/arrows
    // https://eslint.org/docs/rules/no-empty-function
    "no-empty-function": ["error", {
      "allow": [
        "arrowFunctions",
        "functions",
        "methods"
      ]
    }],

    // disallow empty destructuring patterns
    // https://eslint.org/docs/rules/no-empty-pattern
    "no-empty-pattern": "error",

    // disallow comparisons to null without a type-checking operator
    "no-eq-null": "off",

    // disallow use of eval()
    "no-eval": "error",

    // disallow adding to native types
    "no-extend-native": "error",

    // disallow unnecessary function binding
    "no-extra-bind": "error",

    // disallow Unnecessary Labels
    // https://eslint.org/docs/rules/no-extra-label
    "no-extra-label": "error",

    // disallow fallthrough of case statements
    "no-fallthrough": "error",

    // disallow the use of leading or trailing decimal points in numeric literals
    "no-floating-decimal": "error",

    // disallow reassignments of native objects or read-only globals
    // https://eslint.org/docs/rules/no-global-assign
    "no-global-assign": ["error", { "exceptions": [] }],
    // deprecated in favor of no-global-assign
    "no-native-reassign": "off",

    // disallow implicit type conversions
    // https://eslint.org/docs/rules/no-implicit-coercion
    "no-implicit-coercion": ["off", {
      "boolean": false,
      "number": true,
      "string": true,
      "allow": [],
    }],

    // disallow var and named functions in global scope
    // https://eslint.org/docs/rules/no-implicit-globals
    "no-implicit-globals": "off",

    // disallow use of eval()-like methods
    "no-implied-eval": "error",

    // disallow this keywords outside of classes or class-like objects
    "no-invalid-this": "off",

    // disallow usage of __iterator__ property
    "no-iterator": "error",

    // disallow use of labels for anything other then loops and switches
    "no-labels": ["error", { "allowLoop": false, "allowSwitch": false }],

    // disallow unnecessary nested blocks
    "no-lone-blocks": "error",

    // disallow creation of functions within loops
    "no-loop-func": "error",

    // disallow magic numbers
    // https://eslint.org/docs/rules/no-magic-numbers
    "no-magic-numbers": ["off", {
      "ignore": [],
      "ignoreArrayIndexes": true,
      "enforceConst": true,
      "detectObjects": false,
    }],

    // disallow use of multiple spaces
    "no-multi-spaces": ["error", {
      "ignoreEOLComments": true,
    }],

    // disallow use of multiline strings
    "no-multi-str": "error",

    // disallow use of new operator when not part of the assignment or comparison
    "no-new": "error",

    // disallow use of new operator for Function object
    "no-new-func": "error",

    // disallows creating new instances of String, Number, and Boolean
    "no-new-wrappers": "error",

    // disallow use of (old style) octal literals
    "no-octal": "error",

    // disallow use of octal escape sequences in string literals, such as
    // var foo = "Copyright \251";
    "no-octal-escape": "error",

    // disallow reassignment of function parameters
    // "rule": https://eslint.org/docs/rules/no-param-reassign.html
    "no-param-reassign": ["error", {
      "props": false
    }],

    // disallow usage of __proto__ property
    "no-proto": "error",

    // disallow declaring the same variable more then once
    "no-redeclare": "error",

    // disallow certain object properties
    // https://eslint.org/docs/rules/no-restricted-properties
    "no-restricted-properties": ["error", {
      "object": "arguments",
      "property": "callee",
      "message": "arguments.callee is deprecated",
    }, {
      "object": "global",
      "property": "isFinite",
      "message": "Please use Number.isFinite instead",
    }, {
      "object": "self",
      "property": "isFinite",
      "message": "Please use Number.isFinite instead",
    }, {
      "object": "window",
      "property": "isFinite",
      "message": "Please use Number.isFinite instead",
    }, {
      "object": "global",
      "property": "isNaN",
      "message": "Please use Number.isNaN instead",
    }, {
      "object": "self",
      "property": "isNaN",
      "message": "Please use Number.isNaN instead",
    }, {
      "object": "window",
      "property": "isNaN",
      "message": "Please use Number.isNaN instead",
    }, {
      "property": "__defineGetter__",
      "message": "Please use Object.defineProperty instead.",
    }, {
      "property": "__defineSetter__",
      "message": "Please use Object.defineProperty instead.",
    }, {
      "object": "Math",
      "property": "pow",
      "message": "Use the exponentiation operator (**) instead.",
    }],

    // disallow use of assignment in return statement
    "no-return-assign": ["error", "always"],

    // disallow redundant `return await`
    "no-return-await": "error",

    // disallow use of "`javascript":` urls.
    "no-script-url": "error",

    // disallow self assignment
    // https://eslint.org/docs/rules/no-self-assign
    "no-self-assign": "error",

    // disallow comparisons where both sides are exactly the same
    "no-self-compare": "error",

    // disallow use of comma operator
    "no-sequences": "error",

    // restrict what can be thrown as an exception
    "no-throw-literal": "error",

    // disallow unmodified conditions of loops
    // https://eslint.org/docs/rules/no-unmodified-loop-condition
    "no-unmodified-loop-condition": "off",

    // disallow usage of expressions in statement position
    "no-unused-expressions": ["error", {
      "allowShortCircuit": false,
      "allowTernary": false,
      "allowTaggedTemplates": false,
    }],

    // disallow unused labels
    // https://eslint.org/docs/rules/no-unused-labels
    "no-unused-labels": "error",

    // disallow unnecessary .call() and .apply()
    "no-useless-call": "off",

    // disallow useless string concatenation
    // https://eslint.org/docs/rules/no-useless-concat
    "no-useless-concat": "error",

    // disallow unnecessary string escaping
    // https://eslint.org/docs/rules/no-useless-escape
    "no-useless-escape": "error",

    // disallow redundant return; keywords
    // https://eslint.org/docs/rules/no-useless-return
    "no-useless-return": "error",

    // disallow use of void operator
    // https://eslint.org/docs/rules/no-void
    "no-void": "error",

    // disallow usage of configurable warning terms in "comments": e.g. todo
    "no-warning-comments": ["off", { "terms": ["todo", "fixme", "xxx"], "location": "start" }],

    // disallow use of the with statement
    "no-with": "error",

    // require using Error objects as Promise rejection reasons
    // https://eslint.org/docs/rules/prefer-promise-reject-errors
    "prefer-promise-reject-errors": ["error", { "allowEmptyReject": true }],

    // require use of the second argument for parseInt()
    "radix": "error",

    // require `await` in `async function` "(note": this is a horrible rule that should never be used)
    // https://eslint.org/docs/rules/require-await
    "require-await": "off",

    // requires to declare all vars on top of their containing scope
    "vars-on-top": "error",

    // require immediate function invocation to be wrapped in parentheses
    // https://eslint.org/docs/rules/wrap-iife.html
    "wrap-iife": ["error", "outside", { "functionPrototypeMethods": false }],

    // require or disallow Yoda conditions
    "yoda": "error"
  }
}