Possible Errors

Best Practices

accessor-pairs

Turn on
Enforce getter and setter pairs in objects

array-callback-return

Turn on
Enforce return statements in callbacks of array methods

block-scoped-var

Turn on
Enforce the use of variables within the scope they are defined

class-methods-use-this

Turn on
Enforce that class methods utilize this

complexity

Turn on
Enforce a maximum cyclomatic complexity allowed in a program

consistent-return

Turn on
Require return statements to either always or never specify values

curly

Fixable
Turn on
Enforce consistent brace style for all control statements

default-case

Turn on
Require default cases in switch statements

dot-location

Fixable
Turn on
Enforce consistent newlines before and after dots

dot-notation

Fixable
Turn on
Enforce dot notation whenever possible

eqeqeq

Fixable
Turn on
Require the use of === and !==

guard-for-in

Turn on
Require for-in loops to include an if statement

max-classes-per-file

Turn on
Enforce a maximum number of classes per file

no-alert

Turn on
Disallow the use of alert, confirm, and prompt

no-caller

Turn on
Disallow the use of arguments.caller or arguments.callee

no-case-declarations

Recommended
Turn on
Disallow lexical declarations in case clauses

no-div-regex

Turn on
Disallow division operators explicitly at the beginning of regular expressions

no-else-return

Fixable
Turn on
Disallow else blocks after return statements in if statements

no-empty-function

Turn on
Disallow empty functions

no-empty-pattern

Recommended
Turn on
Disallow empty destructuring patterns

no-eq-null

Turn on
Disallow null comparisons without type-checking operators

no-eval

Turn on
Disallow the use of eval()

no-extend-native

Turn on
Disallow extending native types

no-extra-bind

Fixable
Turn on
Disallow unnecessary calls to .bind()

no-extra-label

Fixable
Turn on
Disallow unnecessary labels

no-fallthrough

Recommended
Turn on
Disallow fallthrough of case statements

no-floating-decimal

Fixable
Turn on
Disallow leading or trailing decimal points in numeric literals

no-global-assign

Recommended
Turn on
Disallow assignments to native objects or read-only global variables

no-implicit-coercion

Fixable
Turn on
Disallow shorthand type conversions

no-implicit-globals

Turn on
Disallow variable and function declarations in the global scope

no-implied-eval

Turn on
Disallow the use of eval()-like methods

no-invalid-this

Turn on
Disallow this keywords outside of classes or class-like objects

no-iterator

Turn on
Disallow the use of the __iterator__ property

no-labels

Turn on
Disallow labeled statements

no-lone-blocks

Turn on
Disallow unnecessary nested blocks

no-loop-func

Turn on
Disallow function declarations and expressions inside loop statements

no-magic-numbers

Turn on
Disallow magic numbers

no-multi-spaces

Fixable
Turn on
Disallow multiple spaces

no-multi-str

Turn on
Disallow multiline strings

no-new

Turn on
Disallow new operators outside of assignments or comparisons

no-new-func

Turn on
Disallow new operators with the Function object

no-new-wrappers

Turn on
Disallow new operators with the String, Number, and Boolean objects

no-octal

Recommended
Turn on
Disallow octal literals

no-octal-escape

Turn on
Disallow octal escape sequences in string literals

no-param-reassign

Turn on
Disallow reassigning function parameters

no-proto

Turn on
Disallow the use of the __proto__ property

no-redeclare

Recommended
Turn on
Disallow variable redeclaration

no-restricted-properties

Turn on
Disallow certain properties on certain objects

no-return-await

Turn on
Disallow unnecessary return await

no-script-url

Turn on
Disallow javascript: urls

no-return-assign

Turn on
Disallow assignment operators in return statements

no-self-assign

Recommended
Turn on
Disallow assignments where both sides are exactly the same

no-self-compare

Turn on
Disallow comparisons where both sides are exactly the same

no-sequences

Turn on
Disallow comma operators

no-throw-literal

Turn on
Disallow throwing literals as exceptions

no-unmodified-loop-condition

Turn on
Disallow unmodified loop conditions

no-unused-labels

Recommended
Fixable
Turn on
Disallow unused labels

no-unused-expressions

Turn on
Disallow unused expressions

no-useless-call

Turn on
Disallow unnecessary calls to .call() and .apply()

no-useless-catch

Turn on
Disallow unnecessary catch clauses

no-useless-concat

Turn on
Disallow unnecessary concatenation of literals or template literals

no-useless-escape

Recommended
Turn on
Disallow unnecessary escape characters

no-useless-return

Fixable
Turn on
Disallow redundant return statements

no-void

Turn on
Disallow void operators

no-warning-comments

Turn on
Disallow specified warning terms in comments

no-with

Turn on
Disallow with statements

prefer-promise-reject-errors

Turn on
Require using Error objects as Promise rejection reasons

radix

Turn on
Enforce the consistent use of the radix argument when using parseInt()

require-await

Turn on
Disallow async functions which have no await expression

require-unicode-regexp

Turn on
Enforce the use of u flag on RegExp

vars-on-top

Turn on
Require var declarations be placed at the top of their containing scope

wrap-iife

Fixable
Turn on
Require parentheses around immediate function invocations

yoda

Fixable
Turn on
Require or disallow “Yoda” conditions

Strict Mode

Variables

Node.js and CommonJS

Stylistic Issues

ECMAScript 6

DownloadPreview

no-iterator

- Disallow the use of the __iterator__ property

This rule is aimed at preventing errors that may arise from using the __iterator__ property, which is not implemented in several browsers. As such, it will warn whenever it encounters the __iterator__ property.

What ESLint should do when it catches the rule break

Show a warning

Rule examples

You can check them out here.

no-invalid-thisno-labels