Possible Errors

for-direction

Enforce “for” loop update clause moving the counter in the right direction

getter-return

Enforce return statements in getters

no-await-in-loop

Disallow await inside of loops

no-async-promise-executor

Disallow using an async function as a Promise executor

no-compare-neg-zero

Disallow comparing against -0

no-cond-assign

Disallow assignment operators in conditional expressions

no-control-regex

Disallow control characters in regular expressions

no-constant-condition

Disallow constant expressions in conditions

no-console

Disallow the use of console

no-debugger

Disallow the use of debugger

no-dupe-args

Disallow duplicate arguments in function definitions

no-dupe-keys

Disallow duplicate keys in object literals

no-duplicate-case

Disallow duplicate case labels

no-empty

Disallow empty block statements

no-empty-character-class

Disallow empty character classes in regular expressions

no-ex-assign

Disallow reassigning exceptions in catch clauses

no-extra-boolean-cast

Disallow unnecessary boolean casts

no-extra-parens

Disallow unnecessary parentheses

no-extra-semi

Disallow unnecessary semicolons

no-func-assign

Disallow reassigning function declarations

no-inner-declarations

Disallow variable or function declarations in nested blocks

no-invalid-regexp

Disallow invalid regular expression strings in RegExp constructors

no-irregular-whitespace

Disallow irregular whitespace outside of strings and comments

no-misleading-character-class

Disallow characters which are made with multiple code points in character class syntax

no-obj-calls

Disallow calling global object properties as functions

no-prototype-builtins

Disallow calling some Object.prototype methods directly on objects

no-regex-spaces

Disallow multiple spaces in regular expressions

no-sparse-arrays

Disallow sparse arrays

no-template-curly-in-string

Disallow template literal placeholder syntax in regular strings

no-unexpected-multiline

Disallow confusing multiline expressions

no-unreachable

Disallow unreachable code after return, throw, continue, and break statements

no-unsafe-finally

Disallow control flow statements in finally blocks

no-unsafe-negation

Disallow negating the left operand of relational operators

require-atomic-updates

Disallow assignments that can lead to race conditions due to usage of await or yield

use-isnan

Require calls to isNaN() when checking for NaN

valid-jsdoc

Enforce valid JSDoc comments

valid-typeof

Enforce comparing typeof expressions against valid strings

Best Practices

Strict Mode

Variables

Node.js and CommonJS

Stylistic Issues

ECMAScript 6

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no-irregular-whitespace

- Disallow irregular whitespace outside of strings and comments

This rule is aimed at catching invalid whitespace that is not a normal tab and space. Some of these characters may cause issues in modern browsers and others will be a debugging issue to spot.

What ESLint should do when it catches the rule break

Show a warning

Options

skipComments

Allows any whitespace characters in comments.

skipStrings

Allows any whitespace characters in string literals.

skipTemplates

Allows any whitespace characters in template literals.

skipRegExps

Allows any whitespace characters in regular expression literals.

Rule examples

You can check them out here.

no-invalid-regexp no-misleading-character-class