.eslintrc

{
  "extends": [
    "eslint:recommended",
    "plugin:mithril/recommended"
  ],
  "env": {
    "node": true,
    "browser": true,
    "es6": true,
    "jasmine": true
  },
  "globals": {
    "Modernizr": true,
    "Uint8Array": true,
    "ga": true,
    "m": true
  },
  "parser": "babel-eslint",
  "parserOptions": {
    "ecmaVersion": 6,
    "ecmaFeatures": {}
  },
  "rules": {
    "mithril/jsx-key": 0,
    "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": []
      }
    ],
    // require return statements to either always or never specify values
    "consistent-return": "error",
    // specify curly brace conventions for all control statements
    "curly": [
      "error",
      "multi-line"
    ],
    // multiline

    // require default case in switch statements
    "default-case": [
      "error",
      {
        "commentPattern": "^no default$"
      }
    ],
    // Enforce default clauses in switch statements to be last
    // https://eslint.org/docs/rules/default-case-last
    // TODO: enable, semver-minor, when eslint v7 is required (which is a major)
    "default-case-last": "off",
    // https://eslint.org/docs/rules/default-param-last
    // TODO: enable, semver-minor, when eslint v6.4 is required (which is a major)
    "default-param-last": "off",
    // 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"
      }
    ],
    // Require grouped accessor pairs in object literals and classes
    // https://eslint.org/docs/rules/grouped-accessor-pairs
    // TODO: enable in next major, altho the guide forbids getters/setters anyways
    "grouped-accessor-pairs": "off",
    // make sure for-in loops have an if statement
    "guard-for-in": "error",
    // enforce a maximum number of classes per file
    // https://eslint.org/docs/rules/max-classes-per-file
    "max-classes-per-file": [
      "error",
      1
    ],
    // 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 returning value in constructor
    // https://eslint.org/docs/rules/no-constructor-return
    // TODO: enable, semver-major
    "no-constructor-return": "off",
    // 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": [
      "error",
      {
        "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": false
      }
    ],
    // 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
    // disallow parameter object manipulation except for specific exclusions
    // rule: https://eslint.org/docs/rules/no-param-reassign.html
    "no-param-reassign": [
      "error",
      {
        "props": true,
        "ignorePropertyModificationsFor": [
          "acc",
          // for reduce accumulators
          "accumulator",
          // for reduce accumulators
          "e",
          // for e.returnvalue
          "ctx",
          // for Koa routing
          "context",
          // for Koa routing
          "req",
          // for Express requests
          "request",
          // for Express requests
          "res",
          // for Express responses
          "response",
          // for Express responses
          "$scope",
          // for Angular 1 scopes
          "staticContext"
          // for ReactRouter context
        ]
      }
    ],
    // 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",
      {
        "props": true
      }
    ],
    // 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 unnecessary catch clauses
    // https://eslint.org/docs/rules/no-useless-catch
    "no-useless-catch": "error",
    // 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
      }
    ],
    // Suggest using named capture group in regular expression
    // https://eslint.org/docs/rules/prefer-named-capture-group
    "prefer-named-capture-group": "off",
    // https://eslint.org/docs/rules/prefer-regex-literals
    // TODO; enable, semver-minor, once eslint v6.4 is required (which is a major)
    "prefer-regex-literals": "off",
    // 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",
    // Enforce the use of u flag on RegExp
    // https://eslint.org/docs/rules/require-unicode-regexp
    "require-unicode-regexp": "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",
    // 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 using an async function as a Promise executor
    // https://eslint.org/docs/rules/no-async-promise-executor
    "no-async-promise-executor": "error",
    // 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 conditions in if-else-if chains
    // https://eslint.org/docs/rules/no-dupe-else-if
    // TODO: enable, semver-major
    "no-dupe-else-if": "off",
    // 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",
    // https://eslint.org/docs/rules/no-import-assign
    // TODO: enable, semver-minor, once eslint v6.4 is required (which is a major)
    "no-import-assign": "off",
    // 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 Number Literals That Lose Precision
    // https://eslint.org/docs/rules/no-loss-of-precision
    // TODO: enable, semver-minor, once eslint v7.1 is required (which is major)
    "no-loss-of-precision": "off",
    // Disallow characters which are made with multiple code points in character class syntax
    // https://eslint.org/docs/rules/no-misleading-character-class
    "no-misleading-character-class": "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": "error",
    // disallow multiple spaces in a regular expression literal
    "no-regex-spaces": "error",
    // Disallow returning values from setters
    // https://eslint.org/docs/rules/no-setter-return
    // TODO: enable, semver-major (altho the guide forbids getters/setters already)
    "no-setter-return": "off",
    // 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 useless backreferences in regular expressions
    // https://eslint.org/docs/rules/no-useless-backreference
    // TODO: enable, semver-minor, once eslint v7 is required (which is major)
    "no-useless-backreference": "off",
    // disallow negation of the left operand of an in expression
    // deprecated in favor of no-unsafe-negation
    "no-negated-in-lhs": "off",
    // Disallow assignments that can lead to race conditions due to usage of await or yield
    // https://eslint.org/docs/rules/require-atomic-updates
    // note: not enabled because it is very buggy
    "require-atomic-updates": "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
      }
    ],
    // enforces no braces where they can be omitted
    // https://eslint.org/docs/rules/arrow-body-style
    // TODO: enable requireReturnForObjectLiteral?
    "arrow-body-style": [
      "error",
      "as-needed",
      {
        "requireReturnForObjectLiteral": false
      }
    ],
    // require parens in arrow function arguments
    // https://eslint.org/docs/rules/arrow-parens
    "arrow-parens": [
      "error",
      "as-needed"
    ],
    // 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 specified names in exports
    // https://eslint.org/docs/rules/no-restricted-exports
    // TODO enable, semver-minor, once eslint v7 is required (which is major)
    "no-restricted-exports": [
      "off",
      {
        "restrictedNamedExports": [
          "default",
          // use `export default` to provide a default export
          "then"
          // this will cause tons of confusion when your module is dynamically `import()`ed
        ]
      }
    ],
    // 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",
      "always",
      {
        "ignoreConstructors": false,
        "avoidQuotes": true
      }
    ],
    // suggest using arrow functions as callbacks
    "prefer-arrow-callback": [
      "error",
      {
        "allowNamedFunctions": false,
        "allowUnboundThis": true
      }
    ],
    // 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": [
      "error",
      {
        "VariableDeclarator": {
          "array": false,
          "object": true
        },
        "AssignmentExpression": {
          "array": true,
          "object": false
        }
      },
      {
        "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,
        "ignoreDeclarationSort": 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"
    ],
    // Static analysis:

    // ensure imports point to files/modules that can be resolved
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-unresolved.md
    "import/no-unresolved": [
      "error",
      {
        "commonjs": true,
        "caseSensitive": true
      }
    ],
    // ensure named imports coupled with named exports
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/named.md#when-not-to-use-it
    "import/named": "error",
    // ensure default import coupled with default export
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/default.md#when-not-to-use-it
    "import/default": "off",
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/namespace.md
    "import/namespace": "off",
    // Helpful warnings:

    // disallow invalid exports, e.g. multiple defaults
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/export.md
    "import/export": "error",
    // do not allow a default import name to match a named export
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-named-as-default.md
    "import/no-named-as-default": "error",
    // warn on accessing default export property names that are also named exports
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-named-as-default-member.md
    "import/no-named-as-default-member": "error",
    // disallow use of jsdoc-marked-deprecated imports
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-deprecated.md
    "import/no-deprecated": "off",
    // Forbid the use of extraneous packages
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-extraneous-dependencies.md
    // paths are treated both as absolute paths, and relative to process.cwd()
    "import/no-extraneous-dependencies": [
      "error",
      {
        "devDependencies": [
          "test/**",
          // tape, common npm pattern
          "tests/**",
          // also common npm pattern
          "spec/**",
          // mocha, rspec-like pattern
          "**/__tests__/**",
          // jest pattern
          "**/__mocks__/**",
          // jest pattern
          "test.{js,jsx}",
          // repos with a single test file
          "test-*.{js,jsx}",
          // repos with multiple top-level test files
          "**/*{.,_}{test,spec}.{js,jsx}",
          // tests where the extension or filename suffix denotes that it is a test
          "**/jest.config.js",
          // jest config
          "**/jest.setup.js",
          // jest setup
          "**/vue.config.js",
          // vue-cli config
          "**/webpack.config.js",
          // webpack config
          "**/webpack.config.*.js",
          // webpack config
          "**/rollup.config.js",
          // rollup config
          "**/rollup.config.*.js",
          // rollup config
          "**/gulpfile.js",
          // gulp config
          "**/gulpfile.*.js",
          // gulp config
          "**/Gruntfile{,.js}",
          // grunt config
          "**/protractor.conf.js",
          // protractor config
          "**/protractor.conf.*.js",
          // protractor config
          "**/karma.conf.js"
          // karma config
        ],
        "optionalDependencies": false
      }
    ],
    // Forbid mutable exports
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-mutable-exports.md
    "import/no-mutable-exports": "error",
    // Module systems:

    // disallow require()
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-commonjs.md
    "import/no-commonjs": "off",
    // disallow AMD require/define
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-amd.md
    "import/no-amd": "error",
    // No Node.js builtin modules
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-nodejs-modules.md
    // TODO: enable?
    "import/no-nodejs-modules": "off",
    // Style guide:

    // disallow non-import statements appearing before import statements
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/first.md
    "import/first": "error",
    // disallow non-import statements appearing before import statements
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/imports-first.md
    // deprecated: use `import/first`
    "import/imports-first": "off",
    // disallow duplicate imports
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-duplicates.md
    "import/no-duplicates": "error",
    // disallow namespace imports
    // TODO: enable?
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-namespace.md
    "import/no-namespace": "off",
    // Ensure consistent use of file extension within the import path
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/extensions.md
    "import/extensions": [
      "error",
      "ignorePackages",
      {
        "js": "never",
        "mjs": "never",
        "jsx": "never"
      }
    ],
    // ensure absolute imports are above relative imports and that unassigned imports are ignored
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/order.md
    // TODO: enforce a stricter convention in module import order?
    "import/order": [
      "error",
      {
        "groups": [
          [
            "builtin",
            "external",
            "internal"
          ]
        ]
      }
    ],
    // Require a newline after the last import/require in a group
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/newline-after-import.md
    "import/newline-after-import": "error",
    // Require modules with a single export to use a default export
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/prefer-default-export.md
    "import/prefer-default-export": "error",
    // Restrict which files can be imported in a given folder
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-restricted-paths.md
    "import/no-restricted-paths": "off",
    // Forbid modules to have too many dependencies
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/max-dependencies.md
    "import/max-dependencies": [
      "off",
      {
        "max": 10
      }
    ],
    // Forbid import of modules using absolute paths
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-absolute-path.md
    "import/no-absolute-path": "error",
    // Forbid require() calls with expressions
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-dynamic-require.md
    "import/no-dynamic-require": "error",
    // prevent importing the submodules of other modules
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-internal-modules.md
    "import/no-internal-modules": [
      "off",
      {
        "allow": []
      }
    ],
    // Warn if a module could be mistakenly parsed as a script by a consumer
    // leveraging Unambiguous JavaScript Grammar
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/unambiguous.md
    // this should not be enabled until this proposal has at least been *presented* to TC39.
    // At the moment, it"s not a thing.
    "import/unambiguous": "off",
    // Forbid Webpack loader syntax in imports
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-webpack-loader-syntax.md
    "import/no-webpack-loader-syntax": "error",
    // Prevent unassigned imports
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-unassigned-import.md
    // importing for side effects is perfectly acceptable, if you need side effects.
    "import/no-unassigned-import": "off",
    // Prevent importing the default as if it were named
    // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-named-default.md
    "import/no-named-default": "error",
    // Reports if a module"s default export is unnamed
    // https://github.com/benmosher/eslint-plugin-import/blob/d9b712ac7fd1fddc391f7b234827925c160d956f/docs/rules/no-anonymous-default-export.md
    "import/no-anonymous-default-export": [
      "off",
      {
        "allowArray": false,
        "allowArrowFunction": false,
        "allowAnonymousClass": false,
        "allowAnonymousFunction": false,
        "allowLiteral": false,
        "allowObject": false
      }
    ],
    // This rule enforces that all exports are declared at the bottom of the file.
    // https://github.com/benmosher/eslint-plugin-import/blob/98acd6afd04dcb6920b81330114e146dc8532ea4/docs/rules/exports-last.md
    // TODO: enable?
    "import/exports-last": "off",
    // Reports when named exports are not grouped together in a single export declaration
    // or when multiple assignments to CommonJS module.exports or exports object are present
    // in a single file.
    // https://github.com/benmosher/eslint-plugin-import/blob/44a038c06487964394b1e15b64f3bd34e5d40cde/docs/rules/group-exports.md
    "import/group-exports": "off",
    // forbid default exports. this is a terrible rule, do not use it.
    // https://github.com/benmosher/eslint-plugin-import/blob/44a038c06487964394b1e15b64f3bd34e5d40cde/docs/rules/no-default-export.md
    "import/no-default-export": "off",
    // Prohibit named exports. this is a terrible rule, do not use it.
    // https://github.com/benmosher/eslint-plugin-import/blob/1ec80fa35fa1819e2d35a70e68fb6a149fb57c5e/docs/rules/no-named-export.md
    "import/no-named-export": "off",
    // Forbid a module from importing itself
    // https://github.com/benmosher/eslint-plugin-import/blob/44a038c06487964394b1e15b64f3bd34e5d40cde/docs/rules/no-self-import.md
    "import/no-self-import": "error",
    // Forbid cyclical dependencies between modules
    // https://github.com/benmosher/eslint-plugin-import/blob/d81f48a2506182738409805f5272eff4d77c9348/docs/rules/no-cycle.md
    "import/no-cycle": [
      "error",
      {
        "maxDepth": "infinity"
      }
    ],
    // Ensures that there are no useless path segments
    // https://github.com/benmosher/eslint-plugin-import/blob/ebafcbf59ec9f653b2ac2a0156ca3bcba0a7cf57/docs/rules/no-useless-path-segments.md
    "import/no-useless-path-segments": [
      "error",
      {
        "commonjs": true
      }
    ],
    // dynamic imports require a leading comment with a webpackChunkName
    // https://github.com/benmosher/eslint-plugin-import/blob/ebafcbf59ec9f653b2ac2a0156ca3bcba0a7cf57/docs/rules/dynamic-import-chunkname.md
    "import/dynamic-import-chunkname": [
      "off",
      {
        "importFunctions": [],
        "webpackChunknameFormat": "[0-9a-zA-Z-_/.]+"
      }
    ],
    // Use this rule to prevent imports to folders in relative parent paths.
    // https://github.com/benmosher/eslint-plugin-import/blob/c34f14f67f077acd5a61b3da9c0b0de298d20059/docs/rules/no-relative-parent-imports.md
    "import/no-relative-parent-imports": "off",
    // Reports modules without any exports, or with unused exports
    // https://github.com/benmosher/eslint-plugin-import/blob/f63dd261809de6883b13b6b5b960e6d7f42a7813/docs/rules/no-unused-modules.md
    // TODO: enable, semver-major
    "import/no-unused-modules": [
      "off",
      {
        "ignoreExports": [],
        "missingExports": true,
        "unusedExports": true
      }
    ],
    // 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": [
      "error",
      "never"
    ],
    // enforce line breaks after opening and before closing array brackets
    // https://eslint.org/docs/rules/array-bracket-newline
    // TODO: enable? semver-major
    "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
    // TODO: enable? semver-major
    "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",
      "1tbs",
      {
        "allowSingleLine": true
      }
    ],
    // require camel case names
    "camelcase": [
      "error",
      {
        "properties": "never",
        "ignoreDestructuring": false
      }
    ],
    // 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
        }
      }
    ],
    // never have comma dangle in multiline.
    "comma-dangle": [
      "error", "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"
    ],
    // https://eslint.org/docs/rules/function-call-argument-newline
    "function-call-argument-newline": [
      "error",
      "consistent"
    ],
    // 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,
        "considerPropertyDescriptor": true
      }
    ],
    // require function expressions to have a name
    // https://eslint.org/docs/rules/func-names
    "func-names": "warn",
    // enforces use of function declarations or expressions
    // https://eslint.org/docs/rules/func-style
    // TODO: enable
    "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: null,
        "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",
          "JSXFragment",
          "JSXOpeningFragment",
          "JSXClosingFragment",
          "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
    // TODO: enable?
    "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": "off",
    // 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
      }
    ],
    // enforce a maximum function length
    // https://eslint.org/docs/rules/max-lines-per-function
    "max-lines-per-function": [
      "off",
      {
        "max": 50,
        "skipBlankLines": true,
        "skipComments": true,
        "IIFEs": 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
    // TODO: enable?
    "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": "error",
    // 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": [
          [
            "%",
            "**"
          ],
          [
            "%",
            "+"
          ],
          [
            "%",
            "-"
          ],
          [
            "%",
            "*"
          ],
          [
            "%",
            "/"
          ],
          [
            "/",
            "*"
          ],
          [
            "&",
            "|",
            "<<",
            ">>",
            ">>>"
          ],
          [
            "==",
            "!=",
            "===",
            "!=="
          ],
          [
            "&&",
            "||"
          ]
        ],
        "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, only one newline at the end, and no new lines at the beginning
    // https://eslint.org/docs/rules/no-multiple-empty-lines
    "no-multiple-empty-lines": [
      "error",
      {
        "max": 1,
        "maxBOF": 0,
        "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 certain syntax forms
    // https://eslint.org/docs/rules/no-restricted-syntax
    "no-restricted-syntax": [
      "error",
      {
        "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
    // https://eslint.org/docs/rules/no-underscore-dangle
    "no-underscore-dangle": [
      "error",
      {
        "allow": [],
        "allowAfterThis": false,
        "allowAfterSuper": false,
        "enforceInMethodNames": true
      }
    ],
    // 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": [
      "error",
      {
        "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": "never",
        "switches": "never"
      },
      {
        "allowSingleLineBlocks": true
      }
    ],
    // Require or disallow padding lines between statements
    // https://eslint.org/docs/rules/padding-line-between-statements
    "padding-line-between-statements": "off",
    // Disallow the use of Math.pow in favor of the ** operator
    // https://eslint.org/docs/rules/prefer-exponentiation-operator
    // TODO: enable, semver-major when eslint 5 is dropped
    "prefer-exponentiation-operator": "off",
    // Prefer use of an object spread over Object.assign
    // https://eslint.org/docs/rules/prefer-object-spread
    "prefer-object-spread": "error",
    // 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": "always",
        "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, slash for TS /// comments
        },
        "block": {
          "exceptions": [
            "-",
            "+"
          ],
          "markers": [
            "=",
            "!",
            ":",
            "::"
          ],
          // space here to support sprockets directives and flow comment types
          "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",
    // 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
    "no-restricted-globals": [
      "error",
      "isFinite",
      "isNaN",
      "addEventListener",
      "blur",
      "close",
      "closed",
      "confirm",
      "defaultStatus",
      "defaultstatus",
      "event",
      "external",
      "find",
      "focus",
      "frameElement",
      "frames",
      "history",
      "innerHeight",
      "innerWidth",
      "length",
      "location",
      "locationbar",
      "menubar",
      "moveBy",
      "moveTo",
      "name",
      "onblur",
      "onerror",
      "onfocus",
      "onload",
      "onresize",
      "onunload",
      "open",
      "opener",
      "opera",
      "outerHeight",
      "outerWidth",
      "pageXOffset",
      "pageYOffset",
      "parent",
      "print",
      "removeEventListener",
      "resizeBy",
      "resizeTo",
      "screen",
      "screenLeft",
      "screenTop",
      "screenX",
      "screenY",
      "scroll",
      "scrollbars",
      "scrollBy",
      "scrollTo",
      "scrollX",
      "scrollY",
      "self",
      "status",
      "statusbar",
      "stop",
      "toolbar",
      "top"
    ],
    // 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
    // TODO: enable?
    "no-undefined": "off",
    // disallow declaration of variables that are not used in the code
    "no-unused-vars": [
      "error",
      {
        "vars": "all",
        "args": "after-used",
        "ignoreRestSiblings": true
      }
    ],
    // disallow use of variables before they are defined
    "no-use-before-define": [
      "error",
      {
        "functions": true,
        "classes": true,
        "variables": true
      }
    ]
  }
}