ESLint Blog

ESLint v10.8.0 released

2026-07-24T00:00:00Z

Highlights

In ESLint v10.8.0, the following rules have been updated to avoid incorrect or unexpected behavior in some edge cases:

Features

2fee9bb feat: export ConfigObject from eslint/config (#21082) (sethamus)

Bug Fixes

6b8d2f7 fix: escape reserved characters in rule id in html formatter (#21129) (Francesco Trotta)
9091071 fix: prevent no-unreachable-loop crash when all loop types are ignored (#21116) (Pixel)
e23fafe fix: prefer-object-spread add semicolon when adding parenthesis (#21081) (synthex-byte)
20b5ad0 fix: quadratic-time regex in prefer-template (#21096) (Milos Djermanovic)
8b6f6c0 fix: apply ignore configs to computed methods in class-methods-use-this (#21094) (Pixel)
b2c608c fix: NewExpression with parenthesized callee in preserve-caught-error (#21083) (Francesco Trotta)

Documentation

6ddf858 docs: fix broken Specify Parser Options anchor link (#21106) (Minsu)
784dfbe docs: Clarify no-eq-null description (#21120) (Park Harin)
7ec733a docs: Fix typos and grammar in glossary (#21095) (Marry (Subin Yang))
92bb13f docs: replace quake link (#21108) (Jung Hyeon Jun)
68eb4a5 docs: fix broken Specify Globals anchor links in rule pages (#21103) (Minsu)
d28f697 docs: replace Code Climate CLI links with Qlty CLI links (#21099) (Jung Hyeon Jun)
eccc68d docs: correct --suppressions-location option description (#21093) (Ga eun Lee)
c5963f7 docs: Update README (GitHub Actions Bot)

Chores

4fbf46d test: pin webpack version to 5.108.4 (#21137) (Francesco Trotta)
2d063e2 chore: update HTTP URLs to HTTPS in JSDoc and comments (#21101) (Bo Hyun Kim)
eccbe7b test: add error locations to no-class-assign (#21123) (devoil)
e7d1e43 ci: bump actions/setup-go from 6 to 7 (#21118) (dependabot[bot])
e9d66d0 ci: bump actions/setup-node from 6 to 7 (#21119) (dependabot[bot])
ee225b6 test: Add error location details to no-eq-null rule (#21117) (Park Harin)
044a627 chore: update minimatch to ^10.2.5 (#21107) (김채영)
fb09aa8 chore: update ecosystem plugins (#21115) (ESLint Bot)
5abd878 test: add error locations to no-proto (#21114) (Gihyeon Jeong / 정기현)
9715887 test: Add error location details to no-div-regex (#21110) (Park Harin)
a746ec6 test: add error locations to no-new-wrappers (#21109) (Gihyeon Jeong / 정기현)
8dde645 test: add error locations to no-ex-assign (#21102) (devoil)
13ab0ec test: add error locations to no-label-var (#21098) (Gihyeon Jeong / 정기현)
a99906f test: Add error location details to no-delete-var rule (#21105) (Park Harin)
c47e8dc chore: add missing backticks to languages/js/index.js (#21104) (beeen)
0174428 chore: add missing backticks to translate-cli-options.js (#21097) (dongkyu lee)
3d36589 chore: add missing backticks to serialization.js (#21091) (이규환)
dcc9312 test: add error locations to eqeqeq (#21090) (Ga eun Lee)
2710b18 ci: Add explicit permissions to rebuild-docs-sites workflow (#21089) (Marry (Subin Yang))
5d2f866 chore: update dependency prettier to v3.9.5 (#21086) (renovate[bot])
d584e31 chore: fix failing ecosystem test for eslint-plugin-unicorn (#21084) (Francesco Trotta)
bf3eda0 chore: update ecosystem plugins (#21079) (ESLint Bot)

Automating ESLint migrations with Codemod

2026-07-16T00:00:00Z

We are excited to announce a partnership between ESLint and Codemod to create a better migration experience for ESLint users, starting with the ESLint v8 to v9 and v9 to v10 migrations. All official ESLint codemods live in eslint/codemods and on the Codemod Registry. Community members are encouraged to open issues for missing codemods or contribute new ones through pull requests. Once reviewed and merged by maintainers, codemods are automatically published to the Codemod Registry through GitHub Actions.

What is Codemod?

Codemod is an open source platform for building, sharing, and running automated code migrations at scale. It is an OpenJS Foundation partner, and its tooling has been adopted by projects such as React, Node.js, Express, React Router, Nuxt.js, pnpm, Webpack, MSW, i18next, and more.

Its platform includes JSSG (JS ast-grep), a codemod runtime and workflow engine that supports multi-step transformations and combines deterministic, compiler-aware transformations with AI-powered steps to deliver the right balance of reliability, efficiency, and flexibility. The source code for the Codemod CLI and engine is available on GitHub.

Key features of Codemod include:

Workspace-wide semantic analysis
Cross-file refactors
Multi-language support
Repository-scale performance
A simple, agent-friendly API
Built-in AST inspection through MCP
Secure sandboxed execution
Metrics and codebase mining
Native support for multi-file transformations

Check out the Codemod docs to learn more about JSSG (JS ast-grep), Codemod’s open source toolkit for building codemods, and explore its features.

ESLint v8 to v9 migration

For v8 to v9 migration, we’ve released two codemods: one to help upgrade ESLint config, and another for custom rules.

Migrating configuration with `@eslint/v8-to-v9-config`

npx codemod @eslint/v8-to-v9-config
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Unlike the original ESLint Configuration Migrator, this codemod runs as a workspace migration. It can:

Extract eslintConfig from package.json and generate eslint.config.mjs
Clean up duplicate /* eslint */ comments and invalid /* exported */ comments in source files
Remove deprecated require-jsdoc and valid-jsdoc rule references from inline comments
Migrate those JSDoc rules to eslint-plugin-jsdoc using jsdoc({ config: "flat/recommended", ... })
Add a // TODO: Migrate settings manually comment when custom settings need review
Handle several ESLint v9 rule option changes, including no-unused-vars, no-useless-computed-key, no-sequences, no-constructor-return, camelcase, and no-restricted-imports
Convert env to languageOptions.globals using the globals package
Map excludedFiles to per-config ignores
Move noInlineConfig and reportUnusedDisableDirectives to linterOptions
Import parser packages and plugins
Use defineConfig and globalIgnores from @eslint/config-helpers
Merge ignore patterns from both .eslintignore and .gitignore

For JavaScript config files, the codemod works from the AST and can resolve simple bindings such as const values, identifiers, and spreads. More advanced logic, such as functions, conditionals, and dynamic require() calls, still needs manual review. The workflow also supports options such as --target, eslintConfigCustomName, and codeFormattingCommandEnabled, and prompts you to install required packages after it runs.

The codemod does not migrate --ext CLI usage, so you still need to create a config entry for the file extensions you previously passed on the command line. Learn more on @eslint/v8-to-v9-config’s registry page and in the configuration migration guide.

Migrating custom rules with `@eslint/v8-to-v9-custom-rules`

npx codemod @eslint/v8-to-v9-custom-rules
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Important: Run this codemod only in directories containing ESLint rule files. It may incorrectly transform other JavaScript files that export functions.

The codemod supports CommonJS (module.exports = function (context) { ... }), ES Modules (export default function (context) { ... }), indirect exports (function rule() {} and module.exports = rule), higher-order wrappers such as wrapRule(function (context) { ... }), and rules created with @typescript-eslint/utils RuleCreator.

It performs a comprehensive migration of custom ESLint rules from v8 to v9, including:

Removed context methods — migrates calls to sourceCode equivalents (for example, context.getSource() → sourceCode.getText()), including methods that moved with different signatures such as getScope(), getAncestors(), getDeclaredVariables(), and markVariableAsUsed()
context methods becoming properties — migrates getSourceCode(), getFilename(), getPhysicalFilename(), and getCwd() to their property equivalents with compatibility fallbacks
Removed context.getComments() — converts node-specific calls to getCommentsBefore / getCommentsInside / getCommentsAfter(node)
Removed CodePath#currentSegments — adds code path tracking logic (verify the result matches your rule’s needs)
Function-style rules are no longer supported — converts to the object format with meta and create

The codemod also moves module.exports.schema into meta, converts old-style context.report(node, message) calls to object format, detects fixable rules, and adds fixable: "code" to meta.

It does not cover context.parserOptions and context.parserPath, because those properties are not removed until ESLint v10.0.0. Prefer context.languageOptions (and context.languageOptions.parser when you need the parser) instead.

Not every change can be fully automated. After running the codemod:

Review TODO comments. Search for TODO in your migrated files. If a rule uses context.options, the codemod may leave a placeholder like schema: [] // TODO: Define schema - this rule uses context.options that you need to replace with a valid JSON schema.
Review comment method changes. getCommentsBefore(), getCommentsInside(), and getCommentsAfter() require a node argument, and no-argument context.getComments() calls should use sourceCode.getAllComments().
Review skipped higher-order wrappers. If a wrapper passes configuration as the second argument (for example, wrapRule(rule, config)), confirm whether any manual migration is needed.
Test your custom rules by running your rule test suite (for example, npm test).

Learn more on @eslint/v8-to-v9-custom-rules’s registry page. For the full list of API changes and how to adopt them manually, see the ESLint v9 migration guide and the blog post for v9 custom rules.

ESLint v9 to v10 migration

Upgrade your ESLint project from v9 to v10 with the following codemod:

npx codemod @eslint/v9-to-v10
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This recipe includes four individual codemods, each of which can also be run independently:

@eslint/v9-to-v10-config: Remove legacy env vars and CLI flags
@eslint/v9-to-v10-custom-rules: Replace removed context and SourceCode methods
@eslint/v9-to-v10-ruletester: Cleanup RuleTester test cases
@eslint/v9-to-v10-linter-api: Fix Linter/ESLint API usage

Check out Codemod Registry to learn more about this recipe and its codemods. For more details about what’s new in v10 and how to adopt the new features, refer to the official ESLint upgrade guide.

Conclusion

Upgrading across major ESLint versions has often meant carefully translating configs, custom rules, and related APIs by hand. With this partnership, official Codemod workflows give you a faster starting point for the v8 to v9 and v9 to v10 migrations, while still leaving room for the manual review steps that complex projects need.

You can try the codemods today through the Codemod Registry, and find the source in eslint/codemods. If you run into a gap, open an issue or contribute a new codemod. For questions about the migrations themselves, see the v9 and v10 upgrade guides, or stop by Discord to talk with the team.

ESLint v9.39.5 released

2026-07-10T00:00:00Z

Highlights

This release backports a fix originally released in v10.3.0 that prevents ESLint from crashing in host environments where require.cache is unavailable, such as Yarn Plug’n’Play.

Bug Fixes

253be16 fix: handle unavailable require cache (backport of #20812 to v9.x) (#21065) (Eric)

Documentation

74930ed docs: switch build to Node.js 24 (#20894) (Milos Djermanovic)
eaec8bb docs: Add ESLint v9.x EOL notice (#20828) (Milos Djermanovic)

Chores

458205f chore: update @eslint/eslintrc and @eslint/js for v9.39.5 (#21077) (Francesco Trotta)
202117b chore: package.json update for @eslint/js release (Jenkins)
d9eb6ed test: disable warning for vm.constants.USE_MAIN_CONTEXT_DEFAULT_LOADER (#21074) (Francesco Trotta)
7b431a7 chore: override re2 dependency for @metascraper/helpers (#21068) (Milos Djermanovic)
daf7791 chore: pin fflate@0.8.2 (#20895) (Milos Djermanovic)
daee8ba ci: use pnpm in eslint-flat-config-utils type integration test (#20829) (Milos Djermanovic)
116d4be ci: unpin Node.js 25.x in CI (#20619) (Copilot)

ESLint v10.7.0 released

2026-07-10T00:00:00Z

Highlights

New option `checkConstructorCallCallbacks` in `max-nested-callbacks`

The max-nested-callbacks rule now supports a checkConstructorCallCallbacks option. When enabled, the rule also counts callback functions passed to constructor calls with new, such as new Promise((resolve) => {}), when calculating nesting depth.

For example, with { "max": 1, "checkConstructorCallCallbacks": true }, the rule reports the following code as exceeding the allowed callback nesting depth:

run(() => {
    new Promise(resolve => resolve());
});
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New option `errorClassNames` in `preserve-caught-error`

The preserve-caught-error rule now supports an errorClassNames option. This option lets you specify additional custom error class names that must preserve the original caught error by passing it as a cause.

For example, with { "errorClassNames": ["MyError"] }, the following code is reported because the thrown MyError does not include the original error as a cause, just like built-in error types must:

try {
    doSomething();
} catch (error) {
    throw new MyError("something went wrong");
}
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Suggestions for `no-compare-neg-zero`

The no-compare-neg-zero rule now supports suggestions. Where appropriate, it suggests replacing -0 with 0 or using Object.is() instead of operators such as === or !==. For example, for an expression such as x === -0, the rule suggests x === 0 to preserve the existing comparison behavior, and Object.is(x, -0) to distinguish -0 from +0.

Features

cf2a9bf feat: add errorClassNames option to preserve-caught-error rule (#21032) (sethamus)
f8b873a feat: max-nested-callbacks option for constructor callbacks (#21063) (fnx)
557fde8 feat: support computed Number.parseInt member access in radix rule (#21041) (Pixel)
0b4a73b feat: add suggestions to no-compare-neg-zero (#21034) (den$)
96cdd42 feat: report invalid signed numeric radix values in radix rule (#21030) (Pixel)

Bug Fixes

3e7bf15 fix: apply ignoreClassesWithImplements to class expressions (#21069) (Pixel)
0d7d70c fix: insert cause outside wrapping parens in preserve-caught-error (#21062) (Mahin Anowar)
75ec753 fix: handle static template literals in eqeqeq rule (#21058) (Pixel)
b717a22 fix: prevent eqeqeq null option from reporting non-equality operators (#21057) (Pixel)
e35b05f fix: avoid no-invalid-regexp false positive for shadowed RegExp (#21051) (Pixel)
a3172b6 fix: avoid no-control-regex false positive for shadowed RegExp (#21050) (Pixel)
d1f637e fix: parenthesize sequence expression operands in no-implicit-coercion (#21045) (spokodev)
8859baf fix: avoid prefer-numeric-literals false positive for shadowed globals (#21047) (한국)
a9e5961 fix: use-isnan false positive on shadowed NaN/Number (#20958) (sethamus)
8a240a7 fix: avoid false positives in radix rule for spread arguments (#21044) (Pixel)

Documentation

c30d808 docs: Update README (GitHub Actions Bot)
5139800 docs: document ESLint migration codemods in v9 and v10 guides (#20980) (Alex Bit)
04174cb docs: Update README (GitHub Actions Bot)
026e130 docs: update semver policy for bug fixes (#21048) (Milos Djermanovic)
9d42fef docs: Update README (GitHub Actions Bot)
b230159 docs: Update README (GitHub Actions Bot)
0129972 docs: correct **/.js glob to **/*.js in config files guide (#21036) (EduardF1)

Chores

9489379 chore: update dependency @eslint/eslintrc to ^3.3.6 (#21076) (renovate[bot])
81a4774 chore: updates for v9.39.5 release (Jenkins)
9835414 chore: enable $ExpectType annotations in all TypeScript files (#21071) (Francesco Trotta)
72adf6b chore: restrict markdownlint-cli2 updates in renovate (#21067) (lumir)
833ec10 chore: update dependency prettier to v3.9.4 (#21061) (renovate[bot])
7ea106d chore: update ecosystem plugins (#21059) (ESLint Bot)
8fb550e chore: add prettier update commit to .git-blame-ignore-revs (#21056) (lumir)
e4e1166 chore: update dependency prettier to v3.9.1 (#21055) (renovate[bot])
0493f53 chore: update prettier to v3.9.0 (#21054) (Pixel)
1056a99 chore: update dependency prettier to v3.8.5 (#21049) (renovate[bot])
4d4155d ci: run ecosystem tests on pull requests (#21027) (sethamus)
993539f chore: update dependency @eslint/json to ^2.0.1 (#21042) (renovate[bot])
53f8b69 test: add error locations to no-constant-binary-expression (#21039) (lumir)
5ab71d5 refactor: clean up radix rule internals (#21015) (Pixel)
a80a9a4 chore: update ecosystem plugins (#21035) (ESLint Bot)
7c9a029 ci: add Node.js 26 to CI (#20847) (lumir)

CodeRabbit becomes ESLint gold sponsor

2026-07-01T00:00:00Z

We are happy to share that CodeRabbit has become an ESLint gold sponsor, donating $1,000 each month for the ongoing maintenance and development of ESLint! CodeRabbit is an AI-powered code review platform that provides fast, context-aware feedback on pull requests. It helps development teams automate and accelerate the code review process, catch bugs and logic errors early, and improve code quality and velocity.

Here’s what Santosh Yadav, Principal Developer Advocate at CodeRabbit, had to say about ESLint:

“We love Open Source and ESLint is critical for the ecosystem. We want to make Open Source more sustainable for maintainers. ESLint is shipped as part of the CodeRabbit tools, and we love to support our dependencies.”

– Santosh Yadav, Principal Developer Advocate, CodeRabbit

ESLint is extremely grateful for the support of the CodeRabbit team. Donations from sponsors like CodeRabbit allow ESLint to pay contributors for ongoing maintenance and development, helping to make the open-source ecosystem more sustainable for everyone.

ESLint v10.6.0 released

2026-06-26T00:00:00Z

Highlights

New option `checkRelationalComparisons` in `no-constant-binary-expression`

ESLint v10.6.0 introduces a new option checkRelationalComparisons for the no-constant-binary-expression rule. When enabled, the rule reports relational comparisons using <, <=, >, or >= whose result is always constant based on their literal operands.

For example:

const value = "a" > "b"; // always `false`
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while (0 <= 0) { // always `true`
    /* ... */
}
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The following rules have been tweaked to improve correctness and ensure more consistent or intuitive behavior in edge cases:

Features

b1f9106 feat: detect Symbol() and BigInt() in no-constant-binary-expression (#20981) (Taejin Kim)
f291007 feat: add checkRelationalComparisons to no-constant-binary-expression (#20948) (sethamus)

Bug Fixes

6b05784 fix: prefer-exponentiation-operator invalid autofix at statement start (#20997) (Milos Djermanovic)
bb9eb2a fix: account for shadowed Boolean in no-extra-boolean-cast (#21013) (den$)
8fd8741 fix: don’t report shadowed undefined in radix rule (#21011) (Pixel)
5784980 fix: don’t report shadowed undefined in no-throw-literal (#21010) (Pixel)
9cd1e6d fix: suppress invalid class suggestion in no-promise-executor-return (#21008) (Pixel)
d4eb2dc fix: don’t report shadowed undefined in prefer-promise-reject-errors (#21006) (Pixel)
2360464 fix: prefer-promise-reject-errors false positives for shadowed Promise (#21003) (den$)
63d52d2 fix: restore max-classes-per-file report range (#21002) (Pixel)
7feaff0 fix: callback detection logic for IIFEs in max-nested-callbacks (#20979) (fnx)
399a2ec fix: don’t report inner non-callbacks in max-nested-callbacks (#20995) (Milos Djermanovic)

Documentation

a83683d docs: Update README (GitHub Actions Bot)
f5449f9 docs: document userland patterns for global assertionOptions in RuleT… (#20986) (playgirl)
bea49f7 docs: Update README (GitHub Actions Bot)
e5f70f9 docs: update code-path diagrams (#20984) (Tanuj Kanti)
8890c2d docs: add TypeScript config guidance for MCP server (#20796) (Pierluigi Lenoci)
3eb3d9b docs: Update README (GitHub Actions Bot)
c5bb59c docs: Update README (GitHub Actions Bot)
eb3c97c docs: fix grammar in prefer-const rule description (#20983) (lumir)

Chores

6a42034 ci: run ecosystem tests on main branch (#20891) (sethamus)
3dbacdb ci: bump actions/checkout from 6 to 7 (#21014) (dependabot[bot])
c3abfca chore: correct JSDoc param types in html formatter (#21018) (Minseon Kim)
a832320 ci: split ecosystem tests into separate jobs (#21001) (xbinaryx)
27166e7 chore: update ecosystem plugins (#21005) (ESLint Bot)
865d76e ci: bump pnpm/action-setup from 6.0.8 to 6.0.9 (#20989) (dependabot[bot])
27a88c9 chore: update dependency markdown-it to v14 in root (#20994) (Milos Djermanovic)
970cea6 chore: update dependency markdown-it to v14 (#20993) (Milos Djermanovic)
b482120 chore: update dependency prettier to v3.8.4 (#20990) (renovate[bot])
6993fb3 chore: update ecosystem plugins (#20985) (ESLint Bot)

ESLint v10.5.0 released

2026-06-12T00:00:00Z

Highlights

Five core rules now highlight smaller ranges of code to avoid shadowing other problems in editors.
- Rules max-lines-per-function, max-nested-callbacks, and max-statements now highlight only the function header instead of the entire function.
- Rules max-depth and no-with now highlight only the first keyword.
Several errors in the calculations have been corrected in the max-depth and max-nested-callbacks rules. These bug fixes can result in reporting more linting errors in existing code.

Features

5ca8c52 feat: correct stack tracking in max-nested-callbacks (#20973) (Pixel998)
b565783 feat: report no-with violations at the with keyword (#20971) (Pixel998)
2ce032f feat: report max-lines-per-function violations at function head (#20966) (Pixel998)
732cb3e feat: report max-nested-callbacks violations at function head (#20967) (Pixel998)
f9c138a feat: report max-depth violations on keywords (#20943) (Pixel998)
bdb496c feat: correct max-depth handling for else-if chains (#20944) (Pixel998)
c296873 feat: update error loc in max-statements to function header (#20907) (Taejin Kim)

Documentation

8ae1b5b docs: Update README (GitHub Actions Bot)
ca7eb90 docs: update Node.js prerequisites to include ICU support (#20962) (Francesco Trotta)
f99b47a docs: Update README (GitHub Actions Bot)
acf03d4 docs: clarify precedence of parserOptions over languageOptions (#20926) (sethamus)

Chores

b18bf58 chore: update ecosystem plugins (#20959) (ESLint Bot)
c2d1444 refactor: replace areAllSegmentsUnreachable with !isAnySegmentReachable (#20951) (Taejin Kim)
243b8c5 chore: enhance config-rule to support oneOf, anyOf, and nested schemas (#20788) (kuldeep kumar)
217b2a9 test: add unit tests for ParserService (#20949) (Taejin Kim)
72003e7 test: add location information to error messages in max-statements (#20945) (lumir)
7797c26 refactor: deduplicate isAnySegmentReachable across rules (#20890) (Taejin Kim)
67c46fa chore: update ecosystem plugins (#20938) (ESLint Bot)
95d8c7a chore: update dependency @eslint/json to v2 (#20934) (renovate[bot])
cf9e496 chore: update @arethetypeswrong/cli to 0.18.3 (#20933) (Pixel998)
fb6d396 test: run type tests with TypeScript 7 (#20868) (sethamus)

ESLint v10.4.1 released

2026-05-29T00:00:00Z

Bug Fixes

e557467 fix: update @eslint/plugin-kit version to 0.7.2 (#20930) (Francesco Trotta)
d4ce898 fix: propagate failures from delegated commands (#20917) (Minh Vu)
f4f3507 fix: prefer-arrow-callback invalid autofix with newline after async (#20916) (kuldeep kumar)
c5bc78b fix: false positive for reference in finally block (#20655) (Tanuj Kanti)
27538c0 fix: add missing CodePath and CodePathSegment types (#20853) (Pixel998)

Documentation

61b0add docs: remove deprecated rule from related rules of max-params (#20921) (Tanuj Kanti)
305d5b9 docs: remove deprecated rules from related rules section (#20911) (Tanuj Kanti)
49b0202 docs: fix display: none of ad (#20901) (Tanuj Kanti)
9067f94 docs: switch build to Node.js 24 (#20893) (Milos Djermanovic)
c91b041 docs: Update README (GitHub Actions Bot)
e349265 docs: clarify semver strings in rule deprecation objects (#20885) (Milos Djermanovic)

Chores

b0e466b test: add data property to invalid tests cases for rules (#20924) (Tanuj Kanti)
f78838b test: add CodePath type coverage (#20904) (Pixel998)
1daa4bd chore: update eslint-plugin-eslint-comments test data to latest commit (#20922) (Francesco Trotta)
002942c ci: declare contents:read on update-readme workflow (#20919) (Arpit Jain)
64bca24 chore: update ecosystem plugins (#20912) (ESLint Bot)
6d7c832 chore: ignore fflate updates in renovate (#20908) (Pixel998)
b2c8638 ci: bump pnpm/action-setup from 6.0.7 to 6.0.8 (#20889) (dependabot[bot])
a9b8d7f chore: increase maxBuffer for ecosystem tests (#20881) (sethamus)
b702ead chore: update ecosystem update PR settings (#20884) (Pixel998)
507f60e chore: update ecosystem plugins (#20882) (ESLint Bot)
92f5c5b test: add unit test for message-count (#20878) (kuldeep kumar)
df32108 chore: add @eslint/markdown and typescript-eslint ecosystem tests (#20837) (sethamus)
327f91d chore: use includeIgnoreFile internally (#20876) (Kirk Waiblinger)
f0dc4bd chore: pin fflate@0.8.2 (#20877) (Milos Djermanovic)
0f4bd25 ci: run Discord alert for ecosystem test failures (#20873) (Copilot)

ESLint v10.4.0 released

2026-05-15T00:00:00Z

Highlights

New `includeIgnoreFile()` helper

This release introduces the includeIgnoreFile() helper for configuration files that allows for including patterns from .gitignore files or any other files with gitignore-style patterns.

Previously available in the external package @eslint/compat, the new includeIgnoreFile helper function is exported from the eslint/config entrypoint and provides an extended API that allows multiple files to be included and patterns to be interpreted relative to the location of those files, which is a common use case for nested .gitignore files.

// eslint.config.js

import { defineConfig, includeIgnoreFile } from "eslint/config";
import { fileURLToPath } from "node:url";

const rootGitignorePath = fileURLToPath(
    new URL(".gitignore", import.meta.url)
);
const nestedGitignorePath = fileURLToPath(
    new URL("some/other/folder/.gitignore", import.meta.url),
);

export default defineConfig([
    includeIgnoreFile([rootGitignorePath, nestedGitignorePath], {
        // option to interpret patterns relative to the locations of the specified files
        gitignoreResolution: true,
    }),
    {
        // your overrides
    },
]);
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Please see the Include .gitignore Files section for more details.

Features

1a45ec5 feat: check sequence expressions in for-direction (#20701) (kuldeep kumar)
450040b feat: add includeIgnoreFile() to eslint/config (#20735) (Kirk Waiblinger)

Bug Fixes

544c0c3 fix: escape code path DOT labels in debug output (#20866) (Pixel998)
6799431 fix: update dependency @eslint/config-helpers to ^0.6.0 (#20850) (renovate[bot])
f078fef fix: handle non-array deprecated rule replacements (#20825) (xbinaryx)

Documentation

7e52a71 docs: add mention of @eslint-react/eslint-plugin (#20869) (Pavel)
db3468b docs: tweak wording around ambiguous CJS-vs-ESM config (#20865) (Kirk Waiblinger)
9084664 docs: Update README (GitHub Actions Bot)
9cc7387 docs: Update README (GitHub Actions Bot)
3d7b548 docs: Update README (GitHub Actions Bot)
191ec3c docs: Update README (GitHub Actions Bot)

Chores

6616856 chore: upgrade knip to v6 (#20875) (Pixel998)
d13b084 ci: ensure auto-created PRs run CI (#20860) (lumir)
e71c7af ci: bump pnpm/action-setup from 6.0.5 to 6.0.7 (#20862) (dependabot[bot])
d84393d test: add unit tests for SuppressionsService.applySuppressions() (#20863) (kuldeep kumar)
24db8cb test: add tests for SuppressionsService.save() (#20802) (kuldeep kumar)
2ef0549 chore: update ecosystem plugins (#20857) (github-actions[bot])
a429791 ci: remove eslint-webpack-plugin types integration test (#20668) (Milos Djermanovic)
9e37386 chore: replace recast with range approach in code-sample-minimizer (#20682) (Copilot)
0dd1f9f test: disable warning for vm.constants.USE_MAIN_CONTEXT_DEFAULT_LOADER (#20845) (Francesco Trotta)
9da3c7b refactor: remove deprecated meta.language and migrate meta.dialects (#20716) (Pixel998)
2099ed1 refactor: add meta.defaultOptions to more rules, enable linting (#20800) (xbinaryx)
f1dfbc9 chore: update ecosystem plugins (#20836) (github-actions[bot])
c759413 ci: bump pnpm/action-setup from 6.0.3 to 6.0.5 (#20843) (dependabot[bot])
5b817d6 test: add unit tests for lib/shared/ast-utils (#20838) (kuldeep kumar)
1c13ae3 test: add unit tests for lib/shared/severity (#20835) (kuldeep kumar)

ESLint v10.3.0 released

2026-05-01T00:00:00Z

Highlights

`no-unused-private-class-members` Suggestions

The no-unused-private-class-members rule now provides suggestions to remove reported unused private class members.

For example, for the following code, in which the rule reports #doSomethingElse as unused:

class C {

    /**
     * My public method.
     */
    doSomething() {
    }

    /**
     * My private method.
     */
    #doSomethingElse() {
    }

}

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It will now suggest removing #doSomethingElse. After applying the suggestion, the method and related comment will be removed:

class C {

    /**
     * My public method.
     */
    doSomething() {
    }

}
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Features

379571a feat: add suggestions for no-unused-private-class-members (#20773) (sethamus)

Bug Fixes

b6ae5cf fix: handle unavailable require cache (#20812) (Simon Podlipsky)
6fb3685 fix: rule suggestions cause continuation in class body (#20787) (Milos Djermanovic)

Documentation

32cc7ab docs: fix typos in docs and comments (#20809) (Tanuj Kanti)
7f47937 docs: Update README (GitHub Actions Bot)

Chores

d32235e ci: use pnpm in eslint-flat-config-utils type integration test (#20826) (Francesco Trotta)
3ffb14e chore: clean up typos in comments and JSDoc (#20821) (Pixel998)
22eb58a chore: add missing continue-on-error to ecosystem-tests.yml (#20818) (Josh Goldberg ✨)
88bf002 ci: bump pnpm/action-setup from 6.0.1 to 6.0.3 (#20815) (dependabot[bot])
97c8c33 chore: update ilshidur/action-discord action to v0.4.0 (#20811) (renovate[bot])
2f58136 chore: pin peter-evans/create-pull-request action to 5f6978f (#20810) (renovate[bot])
77add7f chore: add initial ecosystem plugin tests workflow (#19643) (Josh Goldberg ✨)
4023b55 test: Add unit tests for SuppressionsService.prune() (#20797) (kuldeep kumar)
54080da test: add unit tests for ForkContext (#20778) (kuldeep kumar)
f0e2bcc test: add unit tests for SuppressionsService.suppress() method (#20765) (kuldeep kumar)
a7f0b94 chore: update dependency prettier to v3.8.3 (#20782) (renovate[bot])
7bf93d9 chore: update TypeScript to v6 (#20677) (sethamus)
b42dd72 ci: bump pnpm/action-setup from 6.0.0 to 6.0.1 (#20781) (dependabot[bot])
2b252be test: add unit tests for IdGenerator (#20775) (kuldeep kumar)

ESLint Blog

ESLint v10.8.0 released

Highlights

Features

Bug Fixes

Documentation

Chores

Automating ESLint migrations with Codemod

What is Codemod?

ESLint v8 to v9 migration

Migrating configuration with @eslint/v8-to-v9-config

Migrating custom rules with @eslint/v8-to-v9-custom-rules

ESLint v9 to v10 migration

Conclusion

ESLint v9.39.5 released

Highlights

Bug Fixes

Documentation

Chores

ESLint v10.7.0 released

Highlights

New option checkConstructorCallCallbacks in max-nested-callbacks

New option errorClassNames in preserve-caught-error

Suggestions for no-compare-neg-zero

Features

Bug Fixes

Documentation

Chores

CodeRabbit becomes ESLint gold sponsor

ESLint v10.6.0 released

Highlights

New option checkRelationalComparisons in no-constant-binary-expression

Rule refinements

Features

Bug Fixes

Documentation

Chores

ESLint v10.5.0 released

Highlights

Features

Documentation

Chores

ESLint v10.4.1 released

Bug Fixes

Documentation

Chores

ESLint v10.4.0 released

Highlights

New includeIgnoreFile() helper

Features

Bug Fixes

Documentation

Chores

ESLint v10.3.0 released

Highlights

no-unused-private-class-members Suggestions

Features

Bug Fixes

Documentation

Chores

Migrating configuration with `@eslint/v8-to-v9-config`

Migrating custom rules with `@eslint/v8-to-v9-custom-rules`

New option `checkConstructorCallCallbacks` in `max-nested-callbacks`

New option `errorClassNames` in `preserve-caught-error`

Suggestions for `no-compare-neg-zero`

New option `checkRelationalComparisons` in `no-constant-binary-expression`

New `includeIgnoreFile()` helper

`no-unused-private-class-members` Suggestions