odin-js-fundamentals-part-5/node_modules/eslint-config-airbnb-base/rules/best-practices.js

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module.exports = {
rules: {
// enforces getter/setter pairs in objects
// https://eslint.org/docs/rules/accessor-pairs
'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
// https://eslint.org/docs/rules/block-scoped-var
'block-scoped-var': 'error',
// specify the maximum cyclomatic complexity allowed in a program
// https://eslint.org/docs/rules/complexity
complexity: ['off', 20],
// 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
// https://eslint.org/docs/rules/consistent-return
'consistent-return': 'error',
// specify curly brace conventions for all control statements
// https://eslint.org/docs/rules/curly
curly: ['error', 'multi-line'], // multiline
// require default case in switch statements
// https://eslint.org/docs/rules/default-case
'default-case': ['error', { commentPattern: '^no default$' }],
// Enforce default clauses in switch statements to be last
// https://eslint.org/docs/rules/default-case-last
'default-case-last': 'error',
// https://eslint.org/docs/rules/default-param-last
'default-param-last': 'error',
// encourages use of dot notation whenever possible
// https://eslint.org/docs/rules/dot-notation
'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
'grouped-accessor-pairs': 'error',
// make sure for-in loops have an if statement
// https://eslint.org/docs/rules/guard-for-in
'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
// https://eslint.org/docs/rules/no-alert
'no-alert': 'warn',
// disallow use of arguments.caller or arguments.callee
// https://eslint.org/docs/rules/no-caller
'no-caller': 'error',
// disallow lexical declarations in case/default clauses
// https://eslint.org/docs/rules/no-case-declarations
'no-case-declarations': 'error',
// Disallow returning value in constructor
// https://eslint.org/docs/rules/no-constructor-return
'no-constructor-return': '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': ['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
// https://eslint.org/docs/rules/no-eq-null
'no-eq-null': 'off',
// disallow use of eval()
// https://eslint.org/docs/rules/no-eval
'no-eval': 'error',
// disallow adding to native types
// https://eslint.org/docs/rules/no-extend-native
'no-extend-native': 'error',
// disallow unnecessary function binding
// https://eslint.org/docs/rules/no-extra-bind
'no-extra-bind': 'error',
// disallow Unnecessary Labels
// https://eslint.org/docs/rules/no-extra-label
'no-extra-label': 'error',
// disallow fallthrough of case statements
// https://eslint.org/docs/rules/no-fallthrough
'no-fallthrough': 'error',
// disallow the use of leading or trailing decimal points in numeric literals
// https://eslint.org/docs/rules/no-floating-decimal
'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
// https://eslint.org/docs/rules/no-native-reassign
'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
// https://eslint.org/docs/rules/no-implied-eval
'no-implied-eval': 'error',
// disallow this keywords outside of classes or class-like objects
// https://eslint.org/docs/rules/no-invalid-this
'no-invalid-this': 'off',
// disallow usage of __iterator__ property
// https://eslint.org/docs/rules/no-iterator
'no-iterator': 'error',
// disallow use of labels for anything other than loops and switches
// https://eslint.org/docs/rules/no-labels
'no-labels': ['error', { allowLoop: false, allowSwitch: false }],
// disallow unnecessary nested blocks
// https://eslint.org/docs/rules/no-lone-blocks
'no-lone-blocks': 'error',
// disallow creation of functions within loops
// https://eslint.org/docs/rules/no-loop-func
'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
// https://eslint.org/docs/rules/no-multi-spaces
'no-multi-spaces': ['error', {
ignoreEOLComments: false,
}],
// disallow use of multiline strings
// https://eslint.org/docs/rules/no-multi-str
'no-multi-str': 'error',
// disallow use of new operator when not part of the assignment or comparison
// https://eslint.org/docs/rules/no-new
'no-new': 'error',
// disallow use of new operator for Function object
// https://eslint.org/docs/rules/no-new-func
'no-new-func': 'error',
// disallows creating new instances of String, Number, and Boolean
// https://eslint.org/docs/rules/no-new-wrappers
'no-new-wrappers': 'error',
// Disallow \8 and \9 escape sequences in string literals
// https://eslint.org/docs/rules/no-nonoctal-decimal-escape
'no-nonoctal-decimal-escape': 'error',
// disallow use of (old style) octal literals
// https://eslint.org/docs/rules/no-octal
'no-octal': 'error',
// disallow use of octal escape sequences in string literals, such as
// var foo = 'Copyright \251';
// https://eslint.org/docs/rules/no-octal-escape
'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
// https://eslint.org/docs/rules/no-proto
'no-proto': 'error',
// disallow declaring the same variable more than once
// https://eslint.org/docs/rules/no-redeclare
'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
// https://eslint.org/docs/rules/no-return-assign
'no-return-assign': ['error', 'always'],
// disallow redundant `return await`
// https://eslint.org/docs/rules/no-return-await
'no-return-await': 'error',
// disallow use of `javascript:` urls.
// https://eslint.org/docs/rules/no-script-url
'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
// https://eslint.org/docs/rules/no-self-compare
'no-self-compare': 'error',
// disallow use of comma operator
// https://eslint.org/docs/rules/no-sequences
'no-sequences': 'error',
// restrict what can be thrown as an exception
// https://eslint.org/docs/rules/no-throw-literal
'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
// https://eslint.org/docs/rules/no-unused-expressions
'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()
// https://eslint.org/docs/rules/no-useless-call
'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
// https://eslint.org/docs/rules/no-warning-comments
'no-warning-comments': ['off', { terms: ['todo', 'fixme', 'xxx'], location: 'start' }],
// disallow use of the with statement
// https://eslint.org/docs/rules/no-with
'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
'prefer-regex-literals': ['error', {
disallowRedundantWrapping: true,
}],
// require use of the second argument for parseInt()
// https://eslint.org/docs/rules/radix
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
// https://eslint.org/docs/rules/vars-on-top
'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
// https://eslint.org/docs/rules/yoda
yoda: 'error'
}
};