Breaking Changes
b7cf3bdfix!: correctcamelcaserule schema forallowoption (#18232) (eMerzh)09bd7fefeat!: move AST traversal into SourceCode (#18167) (Nicholas C. Zakas)79a95ebfeat!: disallow multiple configuration comments for same rule (#18157) (Milos Djermanovic)9163646feat!: Rule Tester checks for missing placeholder data in the message (#18073) (fnx)3c4d51dfeat!: default forenforceForClassMembersinno-useless-computed-key(#18054) (Francesco Trotta)47e60f8feat!: Stricter rule test validations (#17654) (fnx)1a94589feat!:no-unused-varsdefault caughtErrors to 'all' (#18043) (Josh Goldberg ✨)57089cbfeat!: no-restricted-imports allow multiple config entries for same path (#18021) (Milos Djermanovic)2e1d549feat!: detect duplicate test cases (#17955) (Bryan Mishkin)701f1affeat!: no-inner-declaration new default behaviour and option (#17885) (Tanuj Kanti)bde5105fix!: handle--output-filefor empty output when saving to disk (#17957) (Nitin Kumar)07107a5fix!: upgrade eslint-scope@8.0.0 (#17942) (Milos Djermanovic)3ee0f6cfix!: no-unused-varsvarsIgnorePatternbehavior with catch arguments (#17932) (Tanuj Kanti)51f8bc8fix!: configuration comments with just severity should retain options (#17945) (Milos Djermanovic)d191bddfeat!: Remove CodePath#currentSegments (#17936) (Milos Djermanovic)946ae00feat!: FlatRuleTester -> RuleTester (#17922) (Nicholas C. Zakas)baff28cfeat!: removeno-inner-declarationsfromeslint:recommended(#17920) (Milos Djermanovic)cadfbcdfeat!: Rename FlatESLint to ESLint (#17914) (Nicholas C. Zakas)d1018fcfeat!: skip running warnings in --quiet mode (#17274) (Maddy Miller)fb81b1cfeat!: Set defaultschema: [], drop support for function-style rules (#17792) (Milos Djermanovic)0b21e1ffeat!: add two more cases tono-implicit-coercion(#17832) (Gürgün Dayıoğlu)2916c63feat!: Switch Linter to flat config by default (#17851) (Nicholas C. Zakas)200518efix!: Parsing 'exported' comment using parseListConfig (#17675) (amondev)bdd6ba1feat!: Remove valid-jsdoc and require-jsdoc (#17694) (Nicholas C. Zakas)12be307fix!: Behavior of CLI when no arguments are passed (#17644) (Nicholas C. Zakas)8fe8c56feat!: Update shouldUseFlatConfig and CLI so flat config is default (#17748) (Nicholas C. Zakas)60dea3efeat!: deprecate no-new-symbol, recommend no-new-native-nonconstructor (#17710) (Francesco Trotta)5aa9c49feat!: check for parsing errors in suggestion fixes (#16639) (Bryan Mishkin)b3e0bb0feat!: assert suggestion messages are unique in rule testers (#17532) (Josh Goldberg ✨)e563c52feat!:no-invalid-regexpmake allowConstructorFlags case-sensitive (#17533) (Josh Goldberg ✨)e5f02c7fix!: no-sequences rule schema correction (#17878) (MHO)6ee3e9efeat!: Updateeslint:recommendedconfiguration (#17716) (Milos Djermanovic)c2cf85afeat!: drop support for string configurations in flat config array (#17717) (Milos Djermanovic)c314fd6feat!: RemoveSourceCode#getComments()(#17715) (Milos Djermanovic)ae78ff1feat!: Remove deprecated context methods (#17698) (Nicholas C. Zakas)f71c328feat!: Swap FlatESLint-ESLint, FlatRuleTester-RuleTester in API (#17823) (Nicholas C. Zakas)5304da0feat!: remove formatters except html, json(-with-metadata), and stylish (#17531) (Josh Goldberg ✨)e1e827ffeat!: Require Node.js^18.18.0 || ^20.9.0 || >=21.1.0(#17725) (Milos Djermanovic)
Features
d54a412feat: Add --inspect-config CLI flag (#18270) (Nicholas C. Zakas)97ce45bfeat: AddreportUsedIgnorePatternoption tono-unused-varsrule (#17662) (Pearce Ropion)3e9fceafeat: Show config names in error messages (#18256) (Nicholas C. Zakas)de40874feat: Rule Performance Statistics for flat ESLint (#17850) (Mara Kiefer)d85c436feat: use-isnan report NaN inindexOfandlastIndexOfwith fromIndex (#18225) (Tanuj Kanti)b8fb572feat: addreportUnusedFallthroughCommentoption to no-fallthrough rule (#18188) (Kirk Waiblinger)1c173dcfeat: addignoreClassWithStaticInitBlockoption tono-unused-vars(#18170) (Tanuj Kanti)a451b32feat: makeno-misleading-character-classreport more granular errors (#18082) (Francesco Trotta)c49ed63feat: update complexity rule for optional chaining & default values (#18152) (Mathias Schreck)11144a2feat:no-restricted-importsoption addedallowImportNames(#16196) (M Pater)74124c2feat: add suggestions touse-isnaninindexOf&lastIndexOfcalls (#18063) (StyleShit)53f0f47feat: Add loadESLint() API method for v9 (#18097) (Nicholas C. Zakas)2d11d46feat: add suggestions touse-isnanin binary expressions (#17996) (StyleShit)26093c7feat: fix false negatives inno-this-before-super(#17762) (Yosuke Ota)5471e43feat: convert unsafe autofixes to suggestions inno-implicit-coercion(#17985) (Gürgün Dayıoğlu)e3051befeat: emit warning when.eslintignorefile is detected (#17952) (Nitin Kumar)a630eddfeat: maintain latest ecma version in ESLint (#17958) (Milos Djermanovic)b4e0503feat: addno-useless-assignmentrule (#17625) (Yosuke Ota)287c4b7feat:no-misleading-character-classgranular errors (#17515) (Josh Goldberg ✨)8792464feat: Enable eslint.config.mjs and eslint.config.cjs (#17909) (Nicholas C. Zakas)24ce927feat: warn by default for unused disable directives (#17879) (Bryan Mishkin)
Bug Fixes
610c148fix: Supportusingdeclarations in no-lone-blocks (#18269) (Kirk Waiblinger)e508800fix: rule tester ignore irrelevant test case properties (#18235) (fnx)a129acbfix: flat config name on ignores object (#18258) (Nicholas C. Zakas)dadc5bffix:constructor-superfalse positives with loops (#18226) (Milos Djermanovic)ae8103dfix: load plugins in the CLI in flat config mode (#18185) (Francesco Trotta)e37153ffix: improve error message for invalid rule config (#18147) (Nitin Kumar)af6e170fix: stop linting files after an error (#18155) (Francesco Trotta)0cb4914fix: validate options when comment with just severity enables rule (#18133) (Milos Djermanovic)c4d26fdfix:use-isnandoesn't report onSequenceExpressions (#18059) (StyleShit)39076fbfix: handle absolute file paths inRuleTester(#17989) (Nitin Kumar)6d11f3dfix: Ensure config keys are printed for config errors (#17980) (Nicholas C. Zakas)806f708fix:no-misleading-character-classedge cases with granular errors (#17970) (Milos Djermanovic)f182114fix: deep merge behavior in flat config (#17906) (Francesco Trotta)b577e8afix: allow circular references in config (#17752) (Francesco Trotta)
Documentation
e151050docs: update get-started to the new@eslint/create-config(#18217) (唯然)94178addocs: mention aboutnamefield in flat config (#18252) (Anthony Fu)1765c24docs: add Troubleshooting page (#18181) (Josh Goldberg ✨)96607d0docs: version selectors synchronization (#18260) (Milos Djermanovic)651ec91docs: remove/* eslint-env */comments from rule examples (#18249) (Milos Djermanovic)950c4f1docs: Update README (GitHub Actions Bot)12f5746docs: add info about dot files and dir in flat config (#18239) (Tanuj Kanti)b93f408docs: update shared settings example (#18251) (Tanuj Kanti)26384d3docs: fixecmaVersionin one example, add checks (#18241) (Milos Djermanovic)7747097docs: Update PR review process (#18233) (Nicholas C. Zakas)b07d427docs: fix typo (#18246) (Kirill Gavrilov)778082ddocs: add Glossary page (#18187) (Josh Goldberg ✨)239a7e2docs: Clarify the description ofsort-importsoptions (#18198) (gyeongwoo park)4769c86docs: fix incorrect example inno-lone-blocks(#18215) (Tanuj Kanti)5251327docs: Update README (GitHub Actions Bot)1dc8618docs: Update README (GitHub Actions Bot)ba1c1bbdocs: Update README (GitHub Actions Bot)337cdf9docs: Explain limitations of RuleTester fix testing (#18175) (Nicholas C. Zakas)c7abd89docs: Explain Node.js version support (#18176) (Nicholas C. Zakas)d961eebdocs: show red underlines in examples in rules docs (#18041) (Yosuke Ota)558274adocs: Update README (GitHub Actions Bot)2908b9bdocs: Update release documentation (#18174) (Nicholas C. Zakas)1f1260edocs: replace HackerOne link with GitHub advisory (#18165) (Francesco Trotta)e5ef3cddocs: add inline cases condition inno-fallthrough(#18158) (Tanuj Kanti)450d0f0docs: fixignoreoption docs (#18154) (Francesco Trotta)5fe095cdocs: show v8.57.0 as latest version in dropdown (#18142) (Milos Djermanovic)7db5bb2docs: Show prerelease version in dropdown (#18135) (Nicholas C. Zakas)73a5f06docs: Update README (GitHub Actions Bot)f95cd27docs: Disallow multiple rule configuration comments in the same example (#18116) (Milos Djermanovic)d8068ecdocs: Update link for schema examples (#18112) (Svetlana)f1c7e6fdocs: Switch to Ethical Ads (#18090) (Strek)15c143fdocs: JS Foundation -> OpenJS Foundation in PR template (#18092) (Nicholas C. Zakas)6ea339edocs: add stricter rule test validations to v9 migration guide (#18085) (Milos Djermanovic)3c816f1docs: use relative link from CLI to core concepts (#18083) (Milos Djermanovic)9458735docs: fix malformedeslintconfig comments in rule examples (#18078) (Francesco Trotta)07a1adadocs: link from--fixCLI doc to the relevant core concept (#18080) (Bryan Mishkin)b844324docs: Update team responsibilities (#18048) (Nicholas C. Zakas)aadfb60docs: document languageOptions and other v9 changes for context (#18074) (fnx)857e242docs: tweak explanation for meta.docs rule properties (#18057) (Bryan Mishkin)10485e8docs: recommend messageId over message for reporting rule violations (#18050) (Bryan Mishkin)98b5ab4docs: Update README (GitHub Actions Bot)505fbf4docs: updateno-restricted-importsrule (#18015) (Tanuj Kanti)c25b4afdocs: Update README (GitHub Actions Bot)33d1ab0docs: add more examples to flat config ignores docs (#18020) (Milos Djermanovic)e6eebcadocs: Update sort-keys options properties count (#18025) (LB (Ben Johnston))1fedfd2docs: Improve flat config ignores docs (#17997) (Nicholas C. Zakas)38b9b06docs: update valid-typeof rule (#18001) (Tanuj Kanti)b4abfeadocs: Update note about ECMAScript support (#17991) (Francesco Trotta)6788873docs: Update release blog post template (#17994) (Nicholas C. Zakas)1f37442docs: Add sections on non-npm plugin configuration (#17984) (Nicholas C. Zakas)96307dadocs: migration guide entry forno-inner-declarations(#17977) (Tanuj Kanti)40be60edocs: Update README (GitHub Actions Bot)d31c180docs: fix number of code-path events on custom rules page (#17969) (Richard Hunter)1529ab2docs: reorder entries in v9 migration guide (#17967) (Milos Djermanovic)9507525docs: Explain how to combine configs (#17947) (Nicholas C. Zakas)7c78576docs: Add more removedcontextmethods to migrate to v9 guide (#17951) (Milos Djermanovic)3a877d6docs: Update removed CLI flags migration (#17939) (Nicholas C. Zakas)4a9cd1edocs: Update Linter API for v9 (#17937) (Milos Djermanovic)2a8eea8docs: update docs for v9.0.0-alpha.0 (#17929) (Milos Djermanovic)7f0ba51docs: showNEXTin version selectors (#17911) (Milos Djermanovic)0a7911edocs: add flat config default to v9 migration guide (#17927) (Milos Djermanovic)94f8065docs: Add CLI updates to migrate to v9 guide (#17924) (Nicholas C. Zakas)16187f2docs: Add exported and string config notes to migrate to v9 guide (#17926) (Nicholas C. Zakas)3ae50ccdocs: Add RuleTester changes to migrate to v9 guide (#17923) (Nicholas C. Zakas)0831b58docs: add rule changes to v9 migration guide (#17925) (Milos Djermanovic)037abfcdocs: update API docs (#17919) (Milos Djermanovic)afc3c03docs: add function-style andmeta.schemachanges to v9 migration guide (#17912) (Milos Djermanovic)1da0723docs: updateeslint:recommendedsection in Migrate to v9.x (#17908) (Milos Djermanovic)f55881fdocs: remove configuration-files-new.md (#17907) (Milos Djermanovic)63ae191docs: Migrate to v9.0.0 (#17905) (Nicholas C. Zakas)e708496docs: Switch to flat config by default (#17840) (Nicholas C. Zakas)fdf0424docs: Update Create a Plugin for flat config (#17826) (Nicholas C. Zakas)e6a91bddocs: Switch shareable config docs to use flat config (#17827) (Nicholas C. Zakas)3831fb7docs: updated examples ofmax-linesrule (#17898) (Tanuj Kanti)cd1ac20docs: Update README (GitHub Actions Bot)
Build Related
26010c2Build: changelog update for 9.0.0-rc.0 (Jenkins)b91f9dcbuild: fix TypeError in prism-eslint-hooks.js (#18209) (Francesco Trotta)d7ec0d1Build: changelog update for 9.0.0-beta.2 (Jenkins)fd9c0a9Build: changelog update for 9.0.0-beta.1 (Jenkins)c9f2f33build: changelog update for 8.57.0 (#18144) (Milos Djermanovic)1bbc495Build: changelog update for 9.0.0-beta.0 (Jenkins)96f8877Build: changelog update for 9.0.0-alpha.2 (Jenkins)52d5e7aBuild: changelog update for 9.0.0-alpha.1 (Jenkins)c2bf27dbuild: update docs files when publishing prereleases (#17940) (Milos Djermanovic)e91d85dBuild: changelog update for 9.0.0-alpha.0 (Jenkins)
Chores
19f9a89chore: Update dependencies for v9.0.0 (#18275) (Nicholas C. Zakas)7c957f2chore: package.json update for @eslint/js release (Jenkins)d73a33cchore: ignore/docs/v8.xin link checker (#18274) (Milos Djermanovic)44a81c6chore: upgrade knip (#18272) (Lars Kappert)e80b60cchore: remove code for testing version selectors (#18266) (Milos Djermanovic)a98babcchore: add npm script to run WebdriverIO test (#18238) (Francesco Trotta)9b7bd3bchore: update dependency markdownlint to ^0.34.0 (#18237) (renovate[bot])297416dchore: package.json update for eslint-9.0.0-rc.0 (#18223) (Francesco Trotta)d363c51chore: package.json update for @eslint/js release (Jenkins)1b841bbchore: fix some comments (#18213) (avoidaway)29c3595chore: remove repetitive words (#18193) (cuithon)acc2e06chore: Introduce Knip (#18005) (Lars Kappert)7509276chore: upgrade @eslint/js@9.0.0-beta.2 (#18180) (Milos Djermanovic)96087b3chore: package.json update for @eslint/js release (Jenkins)925afa2chore: Remove some uses oflodash.merge(#18179) (Milos Djermanovic)972ef15chore: remove invalid type in @eslint/js (#18164) (Nitin Kumar)32ffdd1chore: upgrade @eslint/js@9.0.0-beta.1 (#18146) (Milos Djermanovic)e41425bchore: package.json update for @eslint/js release (Jenkins)bb3b9c6chore: upgrade @eslint/eslintrc@3.0.2 (#18145) (Milos Djermanovic)e462524chore: upgrade eslint-release@3.2.2 (#18138) (Milos Djermanovic)8e13a6bchore: fix spelling mistake in README.md (#18128) (Will Eastcott)66f52e2chore: remove unused tools rule-types.json, update-rule-types.js (#18125) (Josh Goldberg ✨)bf0c7efci: fix sync-labels value of pr-labeler (#18124) (Tanuj Kanti)cace6d0ci: add PR labeler action (#18109) (Nitin Kumar)1a65d3echore: exportbaseconfig fromeslint-config-eslint(#18119) (Milos Djermanovic)9aa4df3refactor: removeglobalsdependency (#18115) (Milos Djermanovic)e40d1d7chore: upgrade @eslint/js@9.0.0-beta.0 (#18108) (Milos Djermanovic)9870f93chore: package.json update for @eslint/js release (Jenkins)2c62e79chore: upgrade @eslint/eslintrc@3.0.1 (#18107) (Milos Djermanovic)81f0294chore: upgrade espree@10.0.1 (#18106) (Milos Djermanovic)5e2b292chore: upgrade eslint-visitor-keys@4.0.0 (#18105) (Milos Djermanovic)ce838adchore: replace dependency npm-run-all with npm-run-all2 ^5.0.0 (#18045) (renovate[bot])54df731chore: update dependency markdownlint-cli to ^0.39.0 (#18084) (renovate[bot])8f06a60chore: update dependency shelljs to ^0.8.5 (#18079) (Francesco Trotta)93ffe30chore: update dependency file-entry-cache to v8 (#17903) (renovate[bot])6ffdcbbchore: upgrade @eslint/js@9.0.0-alpha.2 (#18038) (Milos Djermanovic)2c12715chore: package.json update for @eslint/js release (Jenkins)cc74c4dchore: upgrade espree@10.0.0 (#18037) (Milos Djermanovic)dfb68b6chore: use Node.js 20 for docs sites (#18026) (Milos Djermanovic)8c1b8ddtest: add more tests for ignoring files and directories (#18018) (Milos Djermanovic)60b966bchore: update dependency @eslint/js to v9.0.0-alpha.1 (#18014) (renovate[bot])c893bc0chore: updatemarkdownlinttov0.33.0(#17995) (Nitin Kumar)c5e50eechore: package.json update for @eslint/js release (Jenkins)1bf2520chore: Split Docs CI from core CI (#17897) (Nicholas C. Zakas)320787echore: delete relative-module-resolver.js (#17981) (Francesco Trotta)4926f33refactor: useObject.hasOwn()(#17948) (Milos Djermanovic)df200e1refactor: useArray.prototype.at()to get last elements (#17949) (Milos Djermanovic)750b8dfchore: update dependency glob to v10 (#17917) (renovate[bot])74794f5chore: removed unused eslintrc modules (#17938) (Milos Djermanovic)10ed29cchore: remove unused dependency rimraf (#17934) (Francesco Trotta)903ee60ci: use--forceflag when installing eslint (#17921) (Milos Djermanovic)17fedc1chore: upgrade @eslint/js@9.0.0-alpha.0 (#17928) (Milos Djermanovic)cb89ef3chore: package.json update for @eslint/js release (Jenkins)f6f4a45chore: drop structuredClone polyfill for v9 (#17915) (Kevin Gibbons)412dcbbchore: upgrade eslint-plugin-n@16.6.0 (#17916) (Milos Djermanovic)02a8bafchore: Rename files with underscores (#17910) (Nicholas C. Zakas)c0f5d91chore: remove creating an unused instance of Linter in tests (#17902) (Milos Djermanovic)3826cdfchore: use jsdoc/no-multi-asterisks with allowWhitespace: true (#17900) (Percy Ma)a9a17b3chore: fix getting scope in tests (#17899) (Milos Djermanovic)595a1f6test: ensure that CLI tests run with FlatESLint (#17884) (Francesco Trotta)c7eca43chore: update dependency markdownlint-cli to ^0.38.0 (#17865) (renovate[bot])cc0c9f7ci: bump github/codeql-action from 2 to 3 (#17873) (dependabot[bot])