eslint

eslint

Version 9.10.0
Published 6 days ago
3.29 MB
34 dependencies
MIT license

Install

npm i eslint

yarn add eslint

pnpm add eslint

Overview

An AST-based pattern checker for JavaScript.

Index

Functions

function loadESLint

loadESLint: {
    (options: { useFlatConfig: true }): Promise<typeof ESLint>;
    (options: { useFlatConfig: false }): Promise<typeof LegacyESLint>;
    (options?: { useFlatConfig?: boolean }): Promise<
        typeof ESLint | typeof LegacyESLint
    >;
};

Classes

class ESLint

class ESLint {}

constructor

constructor(options?: ESLint.Options);

property configType

static configType: string;

property version

static readonly version: string;

method calculateConfigForFile

calculateConfigForFile: (filePath: string) => Promise<any>;

method findConfigFile

findConfigFile: () => Promise<string | undefined>;

method getErrorResults

static getErrorResults: (results: ESLint.LintResult[]) => ESLint.LintResult[];

method getRulesMetaForResults

getRulesMetaForResults: (
    results: ESLint.LintResult[]
) => ESLint.LintResultData['rulesMeta'];

method hasFlag

hasFlag: (flag: string) => boolean;

method isPathIgnored

isPathIgnored: (filePath: string) => Promise<boolean>;

method lintFiles

lintFiles: (patterns: string | string[]) => Promise<ESLint.LintResult[]>;

method lintText

lintText: (
    code: string,
    options?: {
        filePath?: string | undefined;
        warnIgnored?: boolean | undefined;
    }
) => Promise<ESLint.LintResult[]>;

method loadFormatter

loadFormatter: (nameOrPath?: string) => Promise<ESLint.Formatter>;

method outputFixes

static outputFixes: (results: ESLint.LintResult[]) => Promise<void>;

class Linter

class Linter {}

constructor

constructor(options?: {
    cwd?: string | undefined;
    configType?: 'flat' | 'eslintrc';
});

property version

static readonly version: string;

property version

version: string;

method defineParser

defineParser: (name: string, parser: Linter.Parser) => void;

method defineRule

defineRule: (name: string, rule: Rule.RuleModule) => void;

method defineRules

defineRules: (rules: { [name: string]: Rule.RuleModule }) => void;

method getFixPassCount

getFixPassCount: () => Linter.Stats['fixPasses'];

method getRules

getRules: () => Map<string, Rule.RuleModule>;

method getSourceCode

getSourceCode: () => SourceCode;

method getTimes

getTimes: () => Linter.Stats['times'];

method verify

verify: {
    (
        code: SourceCode | string,
        config: Linter.LegacyConfig | Linter.Config | Linter.Config[],
        filename?: string
    ): Linter.LintMessage[];
    (
        code: string | SourceCode,
        config:
            | Linter.LegacyConfig<Linter.RulesRecord, Linter.RulesRecord>
            | Linter.Config<Linter.RulesRecord>
            | Linter.Config<Linter.RulesRecord>[],
        options: Linter.LintOptions
    ): Linter.LintMessage[];
};

method verifyAndFix

verifyAndFix: {
    (
        code: string,
        config: Linter.LegacyConfig | Linter.Config | Linter.Config[],
        filename?: string
    ): Linter.FixReport;
    (
        code: string,
        config:
            | Linter.LegacyConfig<Linter.RulesRecord, Linter.RulesRecord>
            | Linter.Config<Linter.RulesRecord>
            | Linter.Config<Linter.RulesRecord>[],
        options: Linter.FixOptions
    ): Linter.FixReport;
};

class RuleTester

class RuleTester {}

constructor

constructor(config?: Linter.Config<Linter.RulesRecord>);

property describe

static describe: (...args: any) => any;

property it

static it: (...args: any) => any;

property itOnly

static itOnly: (...args: any) => any;

method only

static only: (
    item: string | RuleTester.ValidTestCase | RuleTester.InvalidTestCase
) => RuleTester.ValidTestCase | RuleTester.InvalidTestCase;

method run

run: (
    name: string,
    rule: Rule.RuleModule,
    tests: {
        valid: Array<string | RuleTester.ValidTestCase>;
        invalid: RuleTester.InvalidTestCase[];
    }
) => void;

class SourceCode

class SourceCode {}

constructor

constructor(text: string, ast: AST.Program);

constructor

constructor(config: SourceCode.Config);

property ast

ast: AST.Program;

property getFirstToken

getFirstToken: SourceCode.UnaryNodeCursorWithSkipOptions;

property getFirstTokenBetween

getFirstTokenBetween: SourceCode.BinaryCursorWithSkipOptions;

property getFirstTokens

getFirstTokens: SourceCode.UnaryNodeCursorWithCountOptions;

property getFirstTokensBetween

getFirstTokensBetween: SourceCode.BinaryCursorWithCountOptions;

property getLastToken

getLastToken: SourceCode.UnaryNodeCursorWithSkipOptions;

property getLastTokenBetween

getLastTokenBetween: SourceCode.BinaryCursorWithSkipOptions;

property getLastTokens

getLastTokens: SourceCode.UnaryNodeCursorWithCountOptions;

property getLastTokensBetween

getLastTokensBetween: SourceCode.BinaryCursorWithCountOptions;

property getTokenAfter

getTokenAfter: SourceCode.UnaryCursorWithSkipOptions;

property getTokenBefore

getTokenBefore: SourceCode.UnaryCursorWithSkipOptions;

property getTokens

getTokens: ((
    node: ESTree.Node,
    beforeCount?: number,
    afterCount?: number
) => AST.Token[]) &
    SourceCode.UnaryNodeCursorWithCountOptions;

property getTokensAfter

getTokensAfter: SourceCode.UnaryCursorWithCountOptions;

property getTokensBefore

getTokensBefore: SourceCode.UnaryCursorWithCountOptions;

property getTokensBetween

getTokensBetween: SourceCode.BinaryCursorWithCountOptions;

property hasBOM

hasBOM: boolean;

property lines

lines: string[];

property parserServices

parserServices: any;

property scopeManager

scopeManager: Scope.ScopeManager;

property text

text: string;

property visitorKeys

visitorKeys: SourceCode.VisitorKeys;

method commentsExistBetween

commentsExistBetween: (
    left: ESTree.Node | AST.Token | ESTree.Comment,
    right: ESTree.Node | AST.Token | ESTree.Comment
) => boolean;

method getAllComments

getAllComments: () => ESTree.Comment[];

method getAncestors

getAncestors: (node: ESTree.Node) => ESTree.Node[];

method getCommentsAfter

getCommentsAfter: (nodeOrToken: ESTree.Node | AST.Token) => ESTree.Comment[];

method getCommentsBefore

getCommentsBefore: (nodeOrToken: ESTree.Node | AST.Token) => ESTree.Comment[];

method getCommentsInside

getCommentsInside: (node: ESTree.Node) => ESTree.Comment[];

method getDeclaredVariables

getDeclaredVariables: (node: ESTree.Node) => Scope.Variable[];

method getIndexFromLoc

getIndexFromLoc: (location: ESTree.Position) => number;

method getJSDocComment

getJSDocComment: (node: ESTree.Node) => ESTree.Comment | null;

method getLines

getLines: () => string[];

method getLocFromIndex

getLocFromIndex: (index: number) => ESTree.Position;

method getNodeByRangeIndex

getNodeByRangeIndex: (index: number) => ESTree.Node | null;

method getScope

getScope: (node: ESTree.Node) => Scope.Scope;

method getText

getText: (
    node?: ESTree.Node,
    beforeCount?: number,
    afterCount?: number
) => string;

method getTokenByRangeStart

getTokenByRangeStart: {
    (offset: number, options?: { includeComments: false }): AST.Token | null;
    (offset: number, options: { includeComments: boolean }): any;
};

method isSpaceBetween

isSpaceBetween: (
    first: ESTree.Node | AST.Token,
    second: ESTree.Node | AST.Token
) => boolean;

method isSpaceBetweenTokens

isSpaceBetweenTokens: (first: AST.Token, second: AST.Token) => boolean;

method markVariableAsUsed

markVariableAsUsed: (name: string, refNode?: ESTree.Node) => boolean;

method splitLines

static splitLines: (text: string) => string[];

Namespaces

namespace AST

namespace AST {}

interface Program

interface Program extends ESTree.Program {}

property comments

comments: ESTree.Comment[];

property loc

loc: SourceLocation;

property range

range: Range;

property tokens

tokens: Token[];

interface SourceLocation

interface SourceLocation {}

property end

end: ESTree.Position;

property start

start: ESTree.Position;

interface Token

interface Token {}

property loc

loc: SourceLocation;

property range

range: Range;

property type

type: TokenType;

property value

value: string;

type Range

type Range = [number, number];

type TokenType

type TokenType =
    | 'Boolean'
    | 'Null'
    | 'Identifier'
    | 'Keyword'
    | 'Punctuator'
    | 'JSXIdentifier'
    | 'JSXText'
    | 'Numeric'
    | 'String'
    | 'RegularExpression';

namespace ESLint

namespace ESLint {}

interface DeprecatedRuleUse

interface DeprecatedRuleUse {}

property replacedBy

replacedBy: string[];

property ruleId

ruleId: string;

interface Environment

interface Environment {}

property globals

globals?: Linter.Globals | undefined;

property parserOptions

parserOptions?: Linter.ParserOptions | undefined;

interface Formatter

interface Formatter {}

method format

format: (
    results: LintResult[],
    data?: LintResultData
) => string | Promise<string>;

interface LegacyOptions

interface LegacyOptions {}

property allowInlineConfig

allowInlineConfig?: boolean | undefined;

property baseConfig

baseConfig?: Linter.LegacyConfig | undefined;

property cache

cache?: boolean | undefined;

property cacheLocation

cacheLocation?: string | undefined;

property cacheStrategy

cacheStrategy?: CacheStrategy | undefined;

property cwd

cwd?: string | undefined;

property errorOnUnmatchedPattern

errorOnUnmatchedPattern?: boolean | undefined;

property extensions

extensions?: string[] | undefined;

property fix

fix?: boolean | ((message: Linter.LintMessage) => boolean) | undefined;

property fixTypes

fixTypes?: FixType[] | undefined;

property flags

flags?: string[] | undefined;

property globInputPaths

globInputPaths?: boolean | undefined;

property ignore

ignore?: boolean | undefined;

property ignorePath

ignorePath?: string | undefined;

property overrideConfig

overrideConfig?: Linter.LegacyConfig | undefined;

property overrideConfigFile

overrideConfigFile?: string | undefined;

property plugins

plugins?: Record<string, Plugin> | undefined;

property reportUnusedDisableDirectives

reportUnusedDisableDirectives?: Linter.StringSeverity | undefined;

property resolvePluginsRelativeTo

resolvePluginsRelativeTo?: string | undefined;

property rulePaths

rulePaths?: string[] | undefined;

property useEslintrc

useEslintrc?: boolean | undefined;

interface LintResult

interface LintResult {}

property errorCount

errorCount: number;

property fatalErrorCount

fatalErrorCount: number;

property filePath

filePath: string;

property fixableErrorCount

fixableErrorCount: number;

property fixableWarningCount

fixableWarningCount: number;

property messages

messages: Linter.LintMessage[];

property output

output?: string | undefined;

property source

source?: string | undefined;

property stats

stats?: Linter.Stats | undefined;

property suppressedMessages

suppressedMessages: Linter.SuppressedLintMessage[];

property usedDeprecatedRules

usedDeprecatedRules: DeprecatedRuleUse[];

property warningCount

warningCount: number;

interface LintResultData

interface LintResultData {}

property cwd

cwd: string;

property maxWarningsExceeded

maxWarningsExceeded?: MaxWarningsExceeded | undefined;

property rulesMeta

rulesMeta: {
    [ruleId: string]: Rule.RuleMetaData;
};

interface MaxWarningsExceeded

interface MaxWarningsExceeded {}

property foundWarnings

foundWarnings: number;

Number of warnings found while linting.

property maxWarnings

maxWarnings: number;

Number of warnings to trigger nonzero exit code.

interface ObjectMetaProperties

interface ObjectMetaProperties {}

property meta

meta?: {
    name?: string | undefined;
    version?: string | undefined;
};

property name

name?: string | undefined;

Deprecated
Use meta.name instead.

property version

version?: string | undefined;

Deprecated
Use meta.version instead.

interface Options

interface Options {}

property allowInlineConfig

allowInlineConfig?: boolean | undefined;

property baseConfig

baseConfig?: Linter.Config | Linter.Config[] | null | undefined;

property cache

cache?: boolean | undefined;

property cacheLocation

cacheLocation?: string | undefined;

property cacheStrategy

cacheStrategy?: CacheStrategy | undefined;

property cwd

cwd?: string | undefined;

property errorOnUnmatchedPattern

errorOnUnmatchedPattern?: boolean | undefined;

property fix

fix?: boolean | ((message: Linter.LintMessage) => boolean) | undefined;

property fixTypes

fixTypes?: FixType[] | undefined;

property flags

flags?: string[] | undefined;

property globInputPaths

globInputPaths?: boolean | undefined;

property ignore

ignore?: boolean | undefined;

property ignorePatterns

ignorePatterns?: string[] | null | undefined;

property overrideConfig

overrideConfig?: Linter.Config | Linter.Config[] | null | undefined;

property overrideConfigFile

overrideConfigFile?: string | boolean | undefined;

property passOnNoPatterns

passOnNoPatterns?: boolean | undefined;

property plugins

plugins?: Record<string, Plugin> | null | undefined;

property ruleFilter

ruleFilter?:
    | ((arg: {
          ruleId: string;
          severity: Exclude<Linter.Severity, 0>;
      }) => boolean)
    | undefined;

property stats

stats?: boolean | undefined;

property warnIgnored

warnIgnored?: boolean | undefined;

interface Plugin

interface Plugin extends ObjectMetaProperties {}

property configs

configs?:
    | Record<string, Linter.LegacyConfig | Linter.Config | Linter.Config[]>
    | undefined;

property environments

environments?: Record<string, Environment> | undefined;

property processors

processors?: Record<string, Linter.Processor> | undefined;

property rules

rules?: Record<string, Rule.RuleModule> | undefined;

type CacheStrategy

type CacheStrategy = 'content' | 'metadata';

type ConfigData

type ConfigData<Rules extends Linter.RulesRecord = Linter.RulesRecord> = Omit<
    Linter.LegacyConfig<Rules>,
    '$schema'
>;

type EditInfo

type EditInfo = Rule.Fix;

type FixType

type FixType = 'directive' | 'problem' | 'suggestion' | 'layout';

type LoadedFormatter

type LoadedFormatter = Formatter;

type ResultsMeta

type ResultsMeta = LintResultData;

namespace Linter

namespace Linter {}

interface BaseConfig

interface BaseConfig<
    Rules extends RulesRecord = RulesRecord,
    OverrideRules extends RulesRecord = Rules
> extends HasRules<Rules> {}

ESLint legacy configuration.
See Also
- [ESLint Legacy Configuration](https://eslint.org/docs/latest/use/configure/)

property $schema

$schema?: string | undefined;

property env

env?: { [name: string]: boolean } | undefined;

An environment provides predefined global variables.
See Also
- [Environments](https://eslint.org/docs/latest/use/configure/language-options-deprecated#specifying-environments)

property extends

extends?: string | string[] | undefined;

Extending configuration files.
See Also
- [Extends](https://eslint.org/docs/latest/use/configure/configuration-files-deprecated#extending-configuration-files)

property globals

globals?: Linter.Globals | undefined;

Specifying globals.
See Also
- [Globals](https://eslint.org/docs/latest/use/configure/language-options-deprecated#specifying-globals)

property noInlineConfig

noInlineConfig?: boolean | undefined;

Disable processing of inline comments.
See Also
- [Disabling Inline Comments](https://eslint.org/docs/latest/use/configure/rules-deprecated#disabling-inline-comments)

property overrides

overrides?: Array<ConfigOverride<OverrideRules>> | undefined;

Overrides can be used to use a differing configuration for matching sub-directories and files.
See Also
- [How do overrides work](https://eslint.org/docs/latest/use/configure/configuration-files-deprecated#how-do-overrides-work)

property parser

parser?: string | undefined;

Parser.
See Also
- [Working with Custom Parsers](https://eslint.org/docs/latest/extend/custom-parsers)
- [Specifying Parser](https://eslint.org/docs/latest/use/configure/parser-deprecated)

property parserOptions

parserOptions?: ParserOptions | undefined;

Parser options.
See Also
- [Working with Custom Parsers](https://eslint.org/docs/latest/extend/custom-parsers)
- [Specifying Parser Options](https://eslint.org/docs/latest/use/configure/language-options-deprecated#specifying-parser-options)

property plugins

plugins?: string[] | undefined;

Which third-party plugins define additional rules, environments, configs, etc. for ESLint to use.
See Also
- [Configuring Plugins](https://eslint.org/docs/latest/use/configure/plugins-deprecated#configure-plugins)

property processor

processor?: string | undefined;

Specifying processor.
See Also
- [processor](https://eslint.org/docs/latest/use/configure/plugins-deprecated#specify-a-processor)

property reportUnusedDisableDirectives

reportUnusedDisableDirectives?: boolean | undefined;

Report unused eslint-disable comments as warning.
See Also
- [Report unused eslint-disable comments](https://eslint.org/docs/latest/use/configure/rules-deprecated#report-unused-eslint-disable-comments)

property settings

settings?: { [name: string]: any } | undefined;

Settings.
See Also
- [Settings](https://eslint.org/docs/latest/use/configure/configuration-files-deprecated#adding-shared-settings)

interface Config

interface Config<Rules extends RulesRecord = RulesRecord> {}

property files

files?: Array<string | string[]>;

An array of glob patterns indicating the files that the configuration object should apply to. If not specified, the configuration object applies to all files

property ignores

ignores?: string[];

An array of glob patterns indicating the files that the configuration object should not apply to. If not specified, the configuration object applies to all files matched by files

property languageOptions

languageOptions?: LanguageOptions;

An object containing settings related to how JavaScript is configured for linting.

property linterOptions

linterOptions?: LinterOptions;

An object containing settings related to the linting process

property name

name?: string;

An string to identify the configuration object. Used in error messages and inspection tools.

property plugins

plugins?: Record<string, ESLint.Plugin>;

An object containing a name-value mapping of plugin names to plugin objects. When files is specified, these plugins are only available to the matching files.

property processor

processor?: string | Processor;

Either an object containing preprocess() and postprocess() methods or a string indicating the name of a processor inside of a plugin (i.e., "pluginName/processorName").

property rules

rules?: Partial<Rules>;

An object containing the configured rules. When files or ignores are specified, these rule configurations are only available to the matching files.

property settings

settings?: Record<string, unknown>;

An object containing name-value pairs of information that should be available to all rules.

interface ConfigOverride

interface ConfigOverride<Rules extends RulesRecord = RulesRecord>
    extends BaseConfig<Rules> {}

The overwrites that apply more differing configuration to specific files or directories.

property excludedFiles

excludedFiles?: string | string[] | undefined;

The glob patterns for excluded files.

property files

files: string | string[];

The glob patterns for target files.

interface ESLintParseResult

interface ESLintParseResult {}

property ast

ast: AST.Program;

property parserServices

parserServices?: SourceCode.ParserServices | undefined;

property scopeManager

scopeManager?: Scope.ScopeManager | undefined;

property visitorKeys

visitorKeys?: SourceCode.VisitorKeys | undefined;

interface FixOptions

interface FixOptions extends LintOptions {}

property fix

fix?: boolean | undefined;

interface FixReport

interface FixReport {}

property fixed

fixed: boolean;

property messages

messages: LintMessage[];

property output

output: string;

interface Globals

interface Globals {}

index signature

[name: string]: GlobalConf;

interface HasRules

interface HasRules<Rules extends RulesRecord = RulesRecord> {}

A configuration object that may have a rules block.

property rules

rules?: Partial<Rules> | undefined;

interface LanguageOptions

interface LanguageOptions {}

property ecmaVersion

ecmaVersion?: EcmaVersion | undefined;

The version of ECMAScript to support. May be any year (i.e., 2022) or version (i.e., 5). Set to "latest" for the most recent supported version. "latest"

property globals

globals?: Globals | undefined;

An object specifying additional objects that should be added to the global scope during linting.

property parser

parser?: Parser | undefined;

An object containing a parse() or parseForESLint() method. If not configured, the default ESLint parser (Espree) will be used.

property parserOptions

parserOptions?: Linter.ParserOptions | undefined;

An object specifying additional options that are passed directly to the parser() method on the parser. The available options are parser-dependent

property sourceType

sourceType?: SourceType | undefined;

The type of JavaScript source code. Possible values are "script" for traditional script files, "module" for ECMAScript modules (ESM), and "commonjs" for CommonJS files. (default: "module" for .js and .mjs files; "commonjs" for .cjs files)

interface LegacyConfig

interface LegacyConfig<
    Rules extends RulesRecord = RulesRecord,
    OverrideRules extends RulesRecord = Rules
> extends BaseConfig<Rules, OverrideRules> {}

ESLint legacy configuration.
See Also
- [ESLint Legacy Configuration](https://eslint.org/docs/latest/use/configure/)

property ignorePatterns

ignorePatterns?: string | string[] | undefined;

Tell ESLint to ignore specific files and directories.
See Also
- [Ignore Patterns](https://eslint.org/docs/latest/use/configure/ignore-deprecated#ignorepatterns-in-config-files)

property root

root?: boolean | undefined;

See Also
- [Using Configuration Files](https://eslint.org/docs/latest/use/configure/configuration-files-deprecated#using-configuration-files)

interface LinterOptions

interface LinterOptions {}

property noInlineConfig

noInlineConfig?: boolean;

A boolean value indicating if inline configuration is allowed.

property reportUnusedDisableDirectives

reportUnusedDisableDirectives?: Severity | StringSeverity | boolean;

A severity value indicating if and how unused disable directives should be tracked and reported.

interface LintMessage

interface LintMessage {}

property column

column: number;

property endColumn

endColumn?: number | undefined;

property endLine

endLine?: number | undefined;

property fatal

fatal?: true | undefined;

property fix

fix?: Rule.Fix | undefined;

property line

line: number;

property message

message: string;

property messageId

messageId?: string | undefined;

property nodeType

nodeType?: string | undefined;

property ruleId

ruleId: string | null;

property severity

severity: Exclude<Severity, 0>;

property suggestions

suggestions?: LintSuggestion[] | undefined;

interface LintOptions

interface LintOptions {}

property allowInlineConfig

allowInlineConfig?: boolean | undefined;

property disableFixes

disableFixes?: boolean | undefined;

property filename

filename?: string | undefined;

property filterCodeBlock

filterCodeBlock?: boolean | undefined;

property postprocess

postprocess?: ((problemLists: LintMessage[][]) => LintMessage[]) | undefined;

property preprocess

preprocess?: ((code: string) => string[]) | undefined;

property reportUnusedDisableDirectives

reportUnusedDisableDirectives?: boolean | undefined;

interface LintSuggestion

interface LintSuggestion {}

property desc

desc: string;

property fix

fix: Rule.Fix;

property messageId

messageId?: string | undefined;

interface LintSuppression

interface LintSuppression {}

property justification

justification: string;

property kind

kind: string;

interface ParserOptions

interface ParserOptions {}

Parser options.
See Also
- [Specifying Parser Options](https://eslint.org/docs/latest/use/configure/language-options-deprecated#specifying-parser-options)

property ecmaFeatures

ecmaFeatures?:
    | {
          globalReturn?: boolean | undefined;
          impliedStrict?: boolean | undefined;
          jsx?: boolean | undefined;
          experimentalObjectRestSpread?: boolean | undefined;
          [key: string]: any;
      }
    | undefined;

An object indicating which additional language features you'd like to use.
See Also
- https://eslint.org/docs/latest/use/configure/language-options-deprecated#specifying-parser-options

property ecmaVersion

ecmaVersion?: EcmaVersion | undefined;

Accepts any valid ECMAScript version number or 'latest':
- A version: es3, es5, es6, es7, es8, es9, es10, es11, es12, es13, es14, ..., or - A year: es2015, es2016, es2017, es2018, es2019, es2020, es2021, es2022, es2023, ..., or - 'latest'
When it's a version or a year, the value must be a number - so do not include the es prefix.
Specifies the version of ECMAScript syntax you want to use. This is used by the parser to determine how to perform scope analysis, and it affects the default
5

property sourceType

sourceType?: SourceType | undefined;

The type of JavaScript source code. Possible values are "script" for traditional script files, "module" for ECMAScript modules (ESM), and "commonjs" for CommonJS files.
'script'
See Also
- https://eslint.org/docs/latest/use/configure/language-options-deprecated#specifying-parser-options

index signature

[key: string]: any;

interface Processor

interface Processor<T extends string | ProcessorFile = string | ProcessorFile>
    extends ESLint.ObjectMetaProperties {}

property supportsAutofix

supportsAutofix?: boolean | undefined;

method postprocess

postprocess: (messages: LintMessage[][], filename: string) => LintMessage[];

method preprocess

preprocess: (text: string, filename: string) => T[];

interface ProcessorFile

interface ProcessorFile {}

property filename

filename: string;

property text

text: string;

interface RulesRecord

interface RulesRecord {}

The rules config object is a key/value map of rule names and their severity and options.

index signature

[rule: string]: RuleEntry;

interface Stats

interface Stats {}

property fixPasses

fixPasses: number;

The number of times ESLint has applied at least one fix after linting.

property times

times: { passes: TimePass[] };

The times spent on (parsing, fixing, linting) a file, where the linting refers to the timing information for each rule.

interface SuppressedLintMessage

interface SuppressedLintMessage extends LintMessage {}

property suppressions

suppressions: LintSuppression[];

interface TimePass

interface TimePass {}

property fix

fix: { total: number };

property parse

parse: { total: number };

property rules

rules?: Record<string, { total: number }>;

property total

total: number;

type EcmaVersion

type EcmaVersion =
    | 3
    | 5
    | 6
    | 7
    | 8
    | 9
    | 10
    | 11
    | 12
    | 13
    | 14
    | 15
    | 16
    | 2015
    | 2016
    | 2017
    | 2018
    | 2019
    | 2020
    | 2021
    | 2022
    | 2023
    | 2024
    | 2025
    | 'latest';

The ECMAScript version of the code being linted.

type ESTreeParser

type ESTreeParser = ESLint.ObjectMetaProperties &
    (
        | { parse(text: string, options?: any): AST.Program }
        | { parseForESLint(text: string, options?: any): ESLintParseResult }
    );

type FlatConfig

type FlatConfig = Config;

Deprecated
Use Config instead of FlatConfig

type GlobalConf

type GlobalConf =
    | boolean
    | 'off'
    | 'readable'
    | 'readonly'
    | 'writable'
    | 'writeable';

type NonESTreeParser

type NonESTreeParser = Omit<ESTreeParser, 'parseForESLint'> &
    (
        | {
              parse(text: string, options?: any): unknown;
          }
        | {
              parseForESLint(
                  text: string,
                  options?: any
              ): Omit<ESLintParseResult, 'ast' | 'scopeManager'> & {
                  ast: unknown;
                  scopeManager?: unknown;
              };
          }
    );

type Parser

type Parser = NonESTreeParser | ESTreeParser;

type RuleEntry

type RuleEntry<Options extends any[] = any[]> =
    | RuleSeverity
    | RuleSeverityAndOptions<Options>;

The severity level for the rule or an array containing the rule severity level, followed by the rule options.
See Also
- [Rules](https://eslint.org/docs/latest/use/configure/rules)

type RuleSeverity

type RuleSeverity = Severity | StringSeverity;

The numeric or human readable severity level for a rule.
See Also
- [Rule Severities](https://eslint.org/docs/latest/use/configure/rules#rule-severities)

type RuleSeverityAndOptions

type RuleSeverityAndOptions<Options extends any[] = any[]> = [
    RuleSeverity,
    ...Partial<Options>
];

An array containing the rule severity level, followed by the rule options.
See Also
- [Rules](https://eslint.org/docs/latest/use/configure/rules)

type Severity

type Severity = 0 | 1 | 2;

The numeric severity level for a rule.
- 0 means off. - 1 means warn. - 2 means error.
See Also
- [Rule Severities](https://eslint.org/docs/latest/use/configure/rules#rule-severities)

type SourceType

type SourceType = 'script' | 'module' | 'commonjs';

The type of JavaScript source code.

type StringSeverity

type StringSeverity = 'off' | 'warn' | 'error';

The human readable severity level for a rule.
See Also
- [Rule Severities](https://eslint.org/docs/latest/use/configure/rules#rule-severities)

namespace Rule

namespace Rule {}

interface CodePath

interface CodePath {}

property childCodePaths

childCodePaths: CodePath[];

property finalSegments

finalSegments: CodePathSegment[];

property id

id: string;

property initialSegment

initialSegment: CodePathSegment;

property origin

origin: CodePathOrigin;

property returnedSegments

returnedSegments: CodePathSegment[];

property thrownSegments

thrownSegments: CodePathSegment[];

property upper

upper: CodePath | null;

interface CodePathSegment

interface CodePathSegment {}

property id

id: string;

property nextSegments

nextSegments: CodePathSegment[];

property prevSegments

prevSegments: CodePathSegment[];

property reachable

reachable: boolean;

interface Fix

interface Fix {}

property range

range: AST.Range;

property text

text: string;

interface NodeListener

interface NodeListener {}

property "ArrayExpression:exit"

'ArrayExpression:exit'?:
    | ((node: ESTree.ArrayExpression & NodeParentExtension) => void)
    | undefined;

property "ArrayPattern:exit"

'ArrayPattern:exit'?:
    | ((node: ESTree.ArrayPattern & NodeParentExtension) => void)
    | undefined;

property "ArrowFunctionExpression:exit"

'ArrowFunctionExpression:exit'?:
    | ((node: ESTree.ArrowFunctionExpression & NodeParentExtension) => void)
    | undefined;

property "AssignmentExpression:exit"

'AssignmentExpression:exit'?:
    | ((node: ESTree.AssignmentExpression & NodeParentExtension) => void)
    | undefined;

property "AssignmentPattern:exit"

'AssignmentPattern:exit'?:
    | ((node: ESTree.AssignmentPattern & NodeParentExtension) => void)
    | undefined;

property "AwaitExpression:exit"

'AwaitExpression:exit'?:
    | ((node: ESTree.AwaitExpression & NodeParentExtension) => void)
    | undefined;

property "BinaryExpression:exit"

'BinaryExpression:exit'?:
    | ((node: ESTree.BinaryExpression & NodeParentExtension) => void)
    | undefined;

property "BlockStatement:exit"

'BlockStatement:exit'?:
    | ((node: ESTree.BlockStatement & NodeParentExtension) => void)
    | undefined;

property "BreakStatement:exit"

'BreakStatement:exit'?:
    | ((node: ESTree.BreakStatement & NodeParentExtension) => void)
    | undefined;

property "CallExpression:exit"

'CallExpression:exit'?:
    | ((node: ESTree.CallExpression & NodeParentExtension) => void)
    | undefined;

property "CatchClause:exit"

'CatchClause:exit'?:
    | ((node: ESTree.CatchClause & NodeParentExtension) => void)
    | undefined;

property "ChainExpression:exit"

'ChainExpression:exit'?:
    | ((node: ESTree.ChainExpression & NodeParentExtension) => void)
    | undefined;

property "ClassBody:exit"

'ClassBody:exit'?:
    | ((node: ESTree.ClassBody & NodeParentExtension) => void)
    | undefined;

property "ClassDeclaration:exit"

'ClassDeclaration:exit'?:
    | ((node: ESTree.ClassDeclaration & NodeParentExtension) => void)
    | undefined;

property "ClassExpression:exit"

'ClassExpression:exit'?:
    | ((node: ESTree.ClassExpression & NodeParentExtension) => void)
    | undefined;

property "ConditionalExpression:exit"

'ConditionalExpression:exit'?:
    | ((node: ESTree.ConditionalExpression & NodeParentExtension) => void)
    | undefined;

property "ContinueStatement:exit"

'ContinueStatement:exit'?:
    | ((node: ESTree.ContinueStatement & NodeParentExtension) => void)
    | undefined;

property "DebuggerStatement:exit"

'DebuggerStatement:exit'?:
    | ((node: ESTree.DebuggerStatement & NodeParentExtension) => void)
    | undefined;

property "DoWhileStatement:exit"

'DoWhileStatement:exit'?:
    | ((node: ESTree.DoWhileStatement & NodeParentExtension) => void)
    | undefined;

property "EmptyStatement:exit"

'EmptyStatement:exit'?:
    | ((node: ESTree.EmptyStatement & NodeParentExtension) => void)
    | undefined;

property "ExportAllDeclaration:exit"

'ExportAllDeclaration:exit'?:
    | ((node: ESTree.ExportAllDeclaration & NodeParentExtension) => void)
    | undefined;

property "ExportDefaultDeclaration:exit"

'ExportDefaultDeclaration:exit'?:
    | ((node: ESTree.ExportDefaultDeclaration & NodeParentExtension) => void)
    | undefined;

property "ExportNamedDeclaration:exit"

'ExportNamedDeclaration:exit'?:
    | ((node: ESTree.ExportNamedDeclaration & NodeParentExtension) => void)
    | undefined;

property "ExportSpecifier:exit"

'ExportSpecifier:exit'?:
    | ((node: ESTree.ExportSpecifier & NodeParentExtension) => void)
    | undefined;

property "ExpressionStatement:exit"

'ExpressionStatement:exit'?:
    | ((node: ESTree.ExpressionStatement & NodeParentExtension) => void)
    | undefined;

property "ForInStatement:exit"

'ForInStatement:exit'?:
    | ((node: ESTree.ForInStatement & NodeParentExtension) => void)
    | undefined;

property "ForOfStatement:exit"

'ForOfStatement:exit'?:
    | ((node: ESTree.ForOfStatement & NodeParentExtension) => void)
    | undefined;

property "ForStatement:exit"

'ForStatement:exit'?:
    | ((node: ESTree.ForStatement & NodeParentExtension) => void)
    | undefined;

property "FunctionDeclaration:exit"

'FunctionDeclaration:exit'?:
    | ((node: ESTree.FunctionDeclaration & NodeParentExtension) => void)
    | undefined;

property "FunctionExpression:exit"

'FunctionExpression:exit'?:
    | ((node: ESTree.FunctionExpression & NodeParentExtension) => void)
    | undefined;

property "Identifier:exit"

'Identifier:exit'?:
    | ((node: ESTree.Identifier & NodeParentExtension) => void)
    | undefined;

property "IfStatement:exit"

'IfStatement:exit'?:
    | ((node: ESTree.IfStatement & NodeParentExtension) => void)
    | undefined;

property "ImportDeclaration:exit"

'ImportDeclaration:exit'?:
    | ((node: ESTree.ImportDeclaration & NodeParentExtension) => void)
    | undefined;

property "ImportDefaultSpecifier:exit"

'ImportDefaultSpecifier:exit'?:
    | ((node: ESTree.ImportDefaultSpecifier & NodeParentExtension) => void)
    | undefined;

property "ImportExpression:exit"

'ImportExpression:exit'?:
    | ((node: ESTree.ImportExpression & NodeParentExtension) => void)
    | undefined;

property "ImportNamespaceSpecifier:exit"

'ImportNamespaceSpecifier:exit'?:
    | ((node: ESTree.ImportNamespaceSpecifier & NodeParentExtension) => void)
    | undefined;

property "ImportSpecifier:exit"

'ImportSpecifier:exit'?:
    | ((node: ESTree.ImportSpecifier & NodeParentExtension) => void)
    | undefined;

property "LabeledStatement:exit"

'LabeledStatement:exit'?:
    | ((node: ESTree.LabeledStatement & NodeParentExtension) => void)
    | undefined;

property "Literal:exit"

'Literal:exit'?:
    | ((node: ESTree.Literal & NodeParentExtension) => void)
    | undefined;

property "LogicalExpression:exit"

'LogicalExpression:exit'?:
    | ((node: ESTree.LogicalExpression & NodeParentExtension) => void)
    | undefined;

property "MemberExpression:exit"

'MemberExpression:exit'?:
    | ((node: ESTree.MemberExpression & NodeParentExtension) => void)
    | undefined;

property "MetaProperty:exit"

'MetaProperty:exit'?:
    | ((node: ESTree.MetaProperty & NodeParentExtension) => void)
    | undefined;

property "MethodDefinition:exit"

'MethodDefinition:exit'?:
    | ((node: ESTree.MethodDefinition & NodeParentExtension) => void)
    | undefined;

property "NewExpression:exit"

'NewExpression:exit'?:
    | ((node: ESTree.NewExpression & NodeParentExtension) => void)
    | undefined;

property "ObjectExpression:exit"

'ObjectExpression:exit'?:
    | ((node: ESTree.ObjectExpression & NodeParentExtension) => void)
    | undefined;

property "ObjectPattern:exit"

'ObjectPattern:exit'?:
    | ((node: ESTree.ObjectPattern & NodeParentExtension) => void)
    | undefined;

property "PrivateIdentifier:exit"

'PrivateIdentifier:exit'?:
    | ((node: ESTree.PrivateIdentifier & NodeParentExtension) => void)
    | undefined;

property "Program:exit"

'Program:exit'?: ((node: ESTree.Program) => void) | undefined;

property "Property:exit"

'Property:exit'?:
    | ((node: ESTree.Property & NodeParentExtension) => void)
    | undefined;

property "PropertyDefinition:exit"

'PropertyDefinition:exit'?:
    | ((node: ESTree.PropertyDefinition & NodeParentExtension) => void)
    | undefined;

property "RestElement:exit"

'RestElement:exit'?:
    | ((node: ESTree.RestElement & NodeParentExtension) => void)
    | undefined;

property "ReturnStatement:exit"

'ReturnStatement:exit'?:
    | ((node: ESTree.ReturnStatement & NodeParentExtension) => void)
    | undefined;

property "SequenceExpression:exit"

'SequenceExpression:exit'?:
    | ((node: ESTree.SequenceExpression & NodeParentExtension) => void)
    | undefined;

property "SpreadElement:exit"

'SpreadElement:exit'?:
    | ((node: ESTree.SpreadElement & NodeParentExtension) => void)
    | undefined;

property "StaticBlock:exit"

'StaticBlock:exit'?:
    | ((node: ESTree.StaticBlock & NodeParentExtension) => void)
    | undefined;

property "Super:exit"

'Super:exit'?: ((node: ESTree.Super & NodeParentExtension) => void) | undefined;

property "SwitchCase:exit"

'SwitchCase:exit'?:
    | ((node: ESTree.SwitchCase & NodeParentExtension) => void)
    | undefined;

property "SwitchStatement:exit"

'SwitchStatement:exit'?:
    | ((node: ESTree.SwitchStatement & NodeParentExtension) => void)
    | undefined;

property "TaggedTemplateExpression:exit"

'TaggedTemplateExpression:exit'?:
    | ((node: ESTree.TaggedTemplateExpression & NodeParentExtension) => void)
    | undefined;

property "TemplateElement:exit"

'TemplateElement:exit'?:
    | ((node: ESTree.TemplateElement & NodeParentExtension) => void)
    | undefined;

property "TemplateLiteral:exit"

'TemplateLiteral:exit'?:
    | ((node: ESTree.TemplateLiteral & NodeParentExtension) => void)
    | undefined;

property "ThisExpression:exit"

'ThisExpression:exit'?:
    | ((node: ESTree.ThisExpression & NodeParentExtension) => void)
    | undefined;

property "ThrowStatement:exit"

'ThrowStatement:exit'?:
    | ((node: ESTree.ThrowStatement & NodeParentExtension) => void)
    | undefined;

property "TryStatement:exit"

'TryStatement:exit'?:
    | ((node: ESTree.TryStatement & NodeParentExtension) => void)
    | undefined;

property "UnaryExpression:exit"

'UnaryExpression:exit'?:
    | ((node: ESTree.UnaryExpression & NodeParentExtension) => void)
    | undefined;

property "UpdateExpression:exit"

'UpdateExpression:exit'?:
    | ((node: ESTree.UpdateExpression & NodeParentExtension) => void)
    | undefined;

property "VariableDeclaration:exit"

'VariableDeclaration:exit'?:
    | ((node: ESTree.VariableDeclaration & NodeParentExtension) => void)
    | undefined;

property "VariableDeclarator:exit"

'VariableDeclarator:exit'?:
    | ((node: ESTree.VariableDeclarator & NodeParentExtension) => void)
    | undefined;

property "WhileStatement:exit"

'WhileStatement:exit'?:
    | ((node: ESTree.WhileStatement & NodeParentExtension) => void)
    | undefined;

property "WithStatement:exit"

'WithStatement:exit'?:
    | ((node: ESTree.WithStatement & NodeParentExtension) => void)
    | undefined;

property "YieldExpression:exit"

'YieldExpression:exit'?:
    | ((node: ESTree.YieldExpression & NodeParentExtension) => void)
    | undefined;

property ArrayExpression

ArrayExpression?:
    | ((node: ESTree.ArrayExpression & NodeParentExtension) => void)
    | undefined;

property ArrayPattern

ArrayPattern?:
    | ((node: ESTree.ArrayPattern & NodeParentExtension) => void)
    | undefined;

property ArrowFunctionExpression

ArrowFunctionExpression?:
    | ((node: ESTree.ArrowFunctionExpression & NodeParentExtension) => void)
    | undefined;

property AssignmentExpression

AssignmentExpression?:
    | ((node: ESTree.AssignmentExpression & NodeParentExtension) => void)
    | undefined;

property AssignmentPattern

AssignmentPattern?:
    | ((node: ESTree.AssignmentPattern & NodeParentExtension) => void)
    | undefined;

property AwaitExpression

AwaitExpression?:
    | ((node: ESTree.AwaitExpression & NodeParentExtension) => void)
    | undefined;

property BinaryExpression

BinaryExpression?:
    | ((node: ESTree.BinaryExpression & NodeParentExtension) => void)
    | undefined;

property BlockStatement

BlockStatement?:
    | ((node: ESTree.BlockStatement & NodeParentExtension) => void)
    | undefined;

property BreakStatement

BreakStatement?:
    | ((node: ESTree.BreakStatement & NodeParentExtension) => void)
    | undefined;

property CallExpression

CallExpression?:
    | ((node: ESTree.CallExpression & NodeParentExtension) => void)
    | undefined;

property CatchClause

CatchClause?:
    | ((node: ESTree.CatchClause & NodeParentExtension) => void)
    | undefined;

property ChainExpression

ChainExpression?:
    | ((node: ESTree.ChainExpression & NodeParentExtension) => void)
    | undefined;

property ClassBody

ClassBody?: ((node: ESTree.ClassBody & NodeParentExtension) => void) | undefined;

property ClassDeclaration

ClassDeclaration?:
    | ((node: ESTree.ClassDeclaration & NodeParentExtension) => void)
    | undefined;

property ClassExpression

ClassExpression?:
    | ((node: ESTree.ClassExpression & NodeParentExtension) => void)
    | undefined;

property ConditionalExpression

ConditionalExpression?:
    | ((node: ESTree.ConditionalExpression & NodeParentExtension) => void)
    | undefined;

property ContinueStatement

ContinueStatement?:
    | ((node: ESTree.ContinueStatement & NodeParentExtension) => void)
    | undefined;

property DebuggerStatement

DebuggerStatement?:
    | ((node: ESTree.DebuggerStatement & NodeParentExtension) => void)
    | undefined;

property DoWhileStatement

DoWhileStatement?:
    | ((node: ESTree.DoWhileStatement & NodeParentExtension) => void)
    | undefined;

property EmptyStatement

EmptyStatement?:
    | ((node: ESTree.EmptyStatement & NodeParentExtension) => void)
    | undefined;

property ExportAllDeclaration

ExportAllDeclaration?:
    | ((node: ESTree.ExportAllDeclaration & NodeParentExtension) => void)
    | undefined;

property ExportDefaultDeclaration

ExportDefaultDeclaration?:
    | ((node: ESTree.ExportDefaultDeclaration & NodeParentExtension) => void)
    | undefined;

property ExportNamedDeclaration

ExportNamedDeclaration?:
    | ((node: ESTree.ExportNamedDeclaration & NodeParentExtension) => void)
    | undefined;

property ExportSpecifier

ExportSpecifier?:
    | ((node: ESTree.ExportSpecifier & NodeParentExtension) => void)
    | undefined;

property ExpressionStatement

ExpressionStatement?:
    | ((node: ESTree.ExpressionStatement & NodeParentExtension) => void)
    | undefined;

property ForInStatement

ForInStatement?:
    | ((node: ESTree.ForInStatement & NodeParentExtension) => void)
    | undefined;

property ForOfStatement

ForOfStatement?:
    | ((node: ESTree.ForOfStatement & NodeParentExtension) => void)
    | undefined;

property ForStatement

ForStatement?:
    | ((node: ESTree.ForStatement & NodeParentExtension) => void)
    | undefined;

property FunctionDeclaration

FunctionDeclaration?:
    | ((node: ESTree.FunctionDeclaration & NodeParentExtension) => void)
    | undefined;

property FunctionExpression

FunctionExpression?:
    | ((node: ESTree.FunctionExpression & NodeParentExtension) => void)
    | undefined;

property Identifier

Identifier?:
    | ((node: ESTree.Identifier & NodeParentExtension) => void)
    | undefined;

property IfStatement

IfStatement?:
    | ((node: ESTree.IfStatement & NodeParentExtension) => void)
    | undefined;

property ImportDeclaration

ImportDeclaration?:
    | ((node: ESTree.ImportDeclaration & NodeParentExtension) => void)
    | undefined;

property ImportDefaultSpecifier

ImportDefaultSpecifier?:
    | ((node: ESTree.ImportDefaultSpecifier & NodeParentExtension) => void)
    | undefined;

property ImportExpression

ImportExpression?:
    | ((node: ESTree.ImportExpression & NodeParentExtension) => void)
    | undefined;

property ImportNamespaceSpecifier

ImportNamespaceSpecifier?:
    | ((node: ESTree.ImportNamespaceSpecifier & NodeParentExtension) => void)
    | undefined;

property ImportSpecifier

ImportSpecifier?:
    | ((node: ESTree.ImportSpecifier & NodeParentExtension) => void)
    | undefined;

property LabeledStatement

LabeledStatement?:
    | ((node: ESTree.LabeledStatement & NodeParentExtension) => void)
    | undefined;

property Literal

Literal?: ((node: ESTree.Literal & NodeParentExtension) => void) | undefined;

property LogicalExpression

LogicalExpression?:
    | ((node: ESTree.LogicalExpression & NodeParentExtension) => void)
    | undefined;

property MemberExpression

MemberExpression?:
    | ((node: ESTree.MemberExpression & NodeParentExtension) => void)
    | undefined;

property MetaProperty

MetaProperty?:
    | ((node: ESTree.MetaProperty & NodeParentExtension) => void)
    | undefined;

property MethodDefinition

MethodDefinition?:
    | ((node: ESTree.MethodDefinition & NodeParentExtension) => void)
    | undefined;

property NewExpression

NewExpression?:
    | ((node: ESTree.NewExpression & NodeParentExtension) => void)
    | undefined;

property ObjectExpression

ObjectExpression?:
    | ((node: ESTree.ObjectExpression & NodeParentExtension) => void)
    | undefined;

property ObjectPattern

ObjectPattern?:
    | ((node: ESTree.ObjectPattern & NodeParentExtension) => void)
    | undefined;

property PrivateIdentifier

PrivateIdentifier?:
    | ((node: ESTree.PrivateIdentifier & NodeParentExtension) => void)
    | undefined;

property Program

Program?: ((node: ESTree.Program) => void) | undefined;

property Property

Property?: ((node: ESTree.Property & NodeParentExtension) => void) | undefined;

property PropertyDefinition

PropertyDefinition?:
    | ((node: ESTree.PropertyDefinition & NodeParentExtension) => void)
    | undefined;

property RestElement

RestElement?:
    | ((node: ESTree.RestElement & NodeParentExtension) => void)
    | undefined;

property ReturnStatement

ReturnStatement?:
    | ((node: ESTree.ReturnStatement & NodeParentExtension) => void)
    | undefined;

property SequenceExpression

SequenceExpression?:
    | ((node: ESTree.SequenceExpression & NodeParentExtension) => void)
    | undefined;

property SpreadElement

SpreadElement?:
    | ((node: ESTree.SpreadElement & NodeParentExtension) => void)
    | undefined;

property StaticBlock

StaticBlock?:
    | ((node: ESTree.StaticBlock & NodeParentExtension) => void)
    | undefined;

property Super

Super?: ((node: ESTree.Super & NodeParentExtension) => void) | undefined;

property SwitchCase

SwitchCase?:
    | ((node: ESTree.SwitchCase & NodeParentExtension) => void)
    | undefined;

property SwitchStatement

SwitchStatement?:
    | ((node: ESTree.SwitchStatement & NodeParentExtension) => void)
    | undefined;

property TaggedTemplateExpression

TaggedTemplateExpression?:
    | ((node: ESTree.TaggedTemplateExpression & NodeParentExtension) => void)
    | undefined;

property TemplateElement

TemplateElement?:
    | ((node: ESTree.TemplateElement & NodeParentExtension) => void)
    | undefined;

property TemplateLiteral

TemplateLiteral?:
    | ((node: ESTree.TemplateLiteral & NodeParentExtension) => void)
    | undefined;

property ThisExpression

ThisExpression?:
    | ((node: ESTree.ThisExpression & NodeParentExtension) => void)
    | undefined;

property ThrowStatement

ThrowStatement?:
    | ((node: ESTree.ThrowStatement & NodeParentExtension) => void)
    | undefined;

property TryStatement

TryStatement?:
    | ((node: ESTree.TryStatement & NodeParentExtension) => void)
    | undefined;

property UnaryExpression

UnaryExpression?:
    | ((node: ESTree.UnaryExpression & NodeParentExtension) => void)
    | undefined;

property UpdateExpression

UpdateExpression?:
    | ((node: ESTree.UpdateExpression & NodeParentExtension) => void)
    | undefined;

property VariableDeclaration

VariableDeclaration?:
    | ((node: ESTree.VariableDeclaration & NodeParentExtension) => void)
    | undefined;

property VariableDeclarator

VariableDeclarator?:
    | ((node: ESTree.VariableDeclarator & NodeParentExtension) => void)
    | undefined;

property WhileStatement

WhileStatement?:
    | ((node: ESTree.WhileStatement & NodeParentExtension) => void)
    | undefined;

property WithStatement

WithStatement?:
    | ((node: ESTree.WithStatement & NodeParentExtension) => void)
    | undefined;

property YieldExpression

YieldExpression?:
    | ((node: ESTree.YieldExpression & NodeParentExtension) => void)
    | undefined;

interface NodeParentExtension

interface NodeParentExtension {}

property parent

parent: Node;

interface ReportDescriptorOptions

interface ReportDescriptorOptions extends ReportDescriptorOptionsBase {}

property suggest

suggest?: SuggestionReportDescriptor[] | null | undefined;

interface ReportDescriptorOptionsBase

interface ReportDescriptorOptionsBase {}

property data

data?: { [key: string]: string };

property fix

fix?: null | ReportFixer;

interface RuleContext

interface RuleContext {}

property cwd

cwd: string;

property filename

filename: string;

property id

id: string;

property languageOptions

languageOptions: Linter.LanguageOptions;

property options

options: any[];

property parserOptions

parserOptions: Linter.ParserOptions;

property parserPath

parserPath: string | undefined;

property physicalFilename

physicalFilename: string;

property settings

settings: { [name: string]: any };

property sourceCode

sourceCode: SourceCode;

method getAncestors

getAncestors: () => ESTree.Node[];

method getCwd

getCwd: () => string;

Deprecated
Use property cwd directly instead

method getDeclaredVariables

getDeclaredVariables: (node: ESTree.Node) => Scope.Variable[];

method getFilename

getFilename: () => string;

Deprecated
Use property filename directly instead

method getPhysicalFilename

getPhysicalFilename: () => string;

Deprecated
Use property physicalFilename directly instead

method getScope

getScope: () => Scope.Scope;

method getSourceCode

getSourceCode: () => SourceCode;

Deprecated
Use property sourceCode directly instead

method markVariableAsUsed

markVariableAsUsed: (name: string) => boolean;

method report

report: (descriptor: ReportDescriptor) => void;

interface RuleFixer

interface RuleFixer {}

method insertTextAfter

insertTextAfter: (nodeOrToken: ESTree.Node | AST.Token, text: string) => Fix;

method insertTextAfterRange

insertTextAfterRange: (range: AST.Range, text: string) => Fix;

method insertTextBefore

insertTextBefore: (nodeOrToken: ESTree.Node | AST.Token, text: string) => Fix;

method insertTextBeforeRange

insertTextBeforeRange: (range: AST.Range, text: string) => Fix;

method remove

remove: (nodeOrToken: ESTree.Node | AST.Token) => Fix;

method removeRange

removeRange: (range: AST.Range) => Fix;

method replaceText

replaceText: (nodeOrToken: ESTree.Node | AST.Token, text: string) => Fix;

method replaceTextRange

replaceTextRange: (range: AST.Range, text: string) => Fix;

interface RuleListener

interface RuleListener extends NodeListener {}

method onCodePathEnd

onCodePathEnd: (codePath: CodePath, node: Node) => void;

method onCodePathSegmentEnd

onCodePathSegmentEnd: (segment: CodePathSegment, node: Node) => void;

method onCodePathSegmentLoop

onCodePathSegmentLoop: (
    fromSegment: CodePathSegment,
    toSegment: CodePathSegment,
    node: Node
) => void;

method onCodePathSegmentStart

onCodePathSegmentStart: (segment: CodePathSegment, node: Node) => void;

method onCodePathStart

onCodePathStart: (codePath: CodePath, node: Node) => void;

index signature

[key: string]:
    | ((codePath: CodePath, node: Node) => void)
    | ((segment: CodePathSegment, node: Node) => void)
    | ((
          fromSegment: CodePathSegment,
          toSegment: CodePathSegment,
          node: Node
      ) => void)
    | ((node: Node) => void)
    | NodeListener[keyof NodeListener]
    | undefined;

interface RuleMetaData

interface RuleMetaData {}

property deprecated

deprecated?: boolean | undefined;

Indicates whether the rule has been deprecated. Omit if not deprecated.

property docs

docs?:
    | {
          /** Provides a short description of the rule. Commonly used when generating lists of rules. */
          description?: string | undefined;
          /** Historically used by some plugins that divide rules into categories in their documentation. */
          category?: string | undefined;
          /** Historically used by some plugins to indicate a rule belongs in their `recommended` configuration. */
          recommended?: boolean | undefined;
          /** Specifies the URL at which the full documentation can be accessed. Code editors often use this to provide a helpful link on highlighted rule violations. */
          url?: string | undefined;
      }
    | undefined;

Properties often used for documentation generation and tooling.

property fixable

fixable?: 'code' | 'whitespace' | undefined;

Specifies if the --fix option on the command line automatically fixes problems reported by the rule. Mandatory for fixable rules.

property hasSuggestions

hasSuggestions?: boolean | undefined;

Specifies whether the rule can return suggestions (defaults to false if omitted). Mandatory for rules that provide suggestions.

property messages

messages?: { [messageId: string]: string } | undefined;

Violation and suggestion messages.

property replacedBy

replacedBy?: readonly string[];

The name of the rule(s) this rule was replaced by, if it was deprecated.

property schema

schema?: JSONSchema4 | JSONSchema4[] | false | undefined;

Specifies the [options](https://eslint.org/docs/latest/extend/custom-rules#options-schemas) so ESLint can prevent invalid [rule configurations](https://eslint.org/docs/latest/use/configure/rules#configuring-rules). Mandatory for rules with options.

property type

type?: 'problem' | 'suggestion' | 'layout' | undefined;

Indicates the type of rule: - "problem" means the rule is identifying code that either will cause an error or may cause a confusing behavior. Developers should consider this a high priority to resolve. - "suggestion" means the rule is identifying something that could be done in a better way but no errors will occur if the code isn’t changed. - "layout" means the rule cares primarily about whitespace, semicolons, commas, and parentheses, all the parts of the program that determine how the code looks rather than how it executes. These rules work on parts of the code that aren’t specified in the AST.

interface RuleModule

interface RuleModule {}

property meta

meta?: RuleMetaData | undefined;

method create

create: (context: RuleContext) => RuleListener;

interface SuggestionReportOptions

interface SuggestionReportOptions {}

property data

data?: { [key: string]: string };

property fix

fix: ReportFixer;

type CodePathOrigin

type CodePathOrigin =
    | 'program'
    | 'function'
    | 'class-field-initializer'
    | 'class-static-block';

type Node

type Node = ESTree.Node & NodeParentExtension;

type NodeTypes

type NodeTypes = ESTree.Node['type'];

type ReportDescriptor

type ReportDescriptor = ReportDescriptorMessage &
    ReportDescriptorLocation &
    ReportDescriptorOptions;

type ReportDescriptorLocation

type ReportDescriptorLocation =
    | { node: ESTree.Node }
    | { loc: AST.SourceLocation | { line: number; column: number } };

type ReportDescriptorMessage

type ReportDescriptorMessage = { message: string } | { messageId: string };

type ReportFixer

type ReportFixer = (fixer: RuleFixer) => null | Fix | IterableIterator<Fix> | Fix[];

type SuggestionDescriptorMessage

type SuggestionDescriptorMessage = { desc: string } | { messageId: string };

type SuggestionReportDescriptor

type SuggestionReportDescriptor = SuggestionDescriptorMessage &
    SuggestionReportOptions;

namespace RuleTester

namespace RuleTester {}

interface InvalidTestCase

interface InvalidTestCase extends ValidTestCase {}

property errors

errors: number | Array<TestCaseError | string>;

property output

output?: string | null | undefined;

interface SuggestionOutput

interface SuggestionOutput {}

property data

data?: Record<string, unknown> | undefined;

property desc

desc?: string;

property messageId

messageId?: string;

property output

output: string;

interface TestCaseError

interface TestCaseError {}

property column

column?: number | undefined;

property data

data?: any;

property endColumn

endColumn?: number | undefined;

property endLine

endLine?: number | undefined;

property line

line?: number | undefined;

property message

message?: string | RegExp;

property messageId

messageId?: string;

property suggestions

suggestions?: SuggestionOutput[] | undefined;

property type

type?: string | undefined;

interface ValidTestCase

interface ValidTestCase {}

property code

code: string;

property filename

filename?: string | undefined;

property languageOptions

languageOptions?: Linter.LanguageOptions | undefined;

property name

name?: string;

property only

only?: boolean;

property options

options?: any;

property settings

settings?: { [name: string]: any } | undefined;

namespace Scope

namespace Scope {}

interface Reference

interface Reference {}

property from

from: Scope;

property identifier

identifier: ESTree.Identifier;

property init

init: boolean;

property resolved

resolved: Variable | null;

property writeExpr

writeExpr: ESTree.Node | null;

method isRead

isRead: () => boolean;

method isReadOnly

isReadOnly: () => boolean;

method isReadWrite

isReadWrite: () => boolean;

method isWrite

isWrite: () => boolean;

method isWriteOnly

isWriteOnly: () => boolean;

interface Scope

interface Scope {}

property block

block: ESTree.Node;

property childScopes

childScopes: Scope[];

property functionExpressionScope

functionExpressionScope: boolean;

property isStrict

isStrict: boolean;

property references

references: Reference[];

property set

set: Map<string, Variable>;

property through

through: Reference[];

property type

type:
    | 'block'
    | 'catch'
    | 'class'
    | 'for'
    | 'function'
    | 'function-expression-name'
    | 'global'
    | 'module'
    | 'switch'
    | 'with'
    | 'TDZ';

property upper

upper: Scope | null;

property variables

variables: Variable[];

property variableScope

variableScope: Scope;