ESLint v10.15.0 released

Highlights

Faster config resolution

This release includes an updated version of @eslint/config-array with a faster implementation of config resolution. This is the step in which ESLint decides, for every file and directory it visits, whether the path is ignored and which objects in the config apply to it.

In our benchmark, which resolves the configs for 1,500 files against a typical flat config, this step is more than three times faster with POSIX paths and about 15% faster with Windows paths. The improvements, made primarily with AI assistance, include:

• A config object’s files and ignores patterns are analyzed only once instead of once per file.
• Paths that cannot match a pattern’s literal parts, such as the src/ or .js in src/**/*.js, are rejected before the full glob match runs.
• For POSIX paths, a file’s location relative to the base path is now computed more efficiently when the path is already normalized.

Config resolution is only one part of an ESLint run, so the effect on total lint time depends on your project. No changes are needed on your side.

Rule improvements

The following rules have been updated to address edge cases or to make reported problem locations more intuitive:

• accessor-pairs
• default-case
• func-names
• no-invalid-this
• no-prototype-builtins
• no-shadow
• no-unneeded-ternary
• no-useless-rename
• prefer-arrow-callback

Features

• ec52157 feat: check proto and assignment targets in func-names (#21521) (Lê Văn Xuân Hoàn)
• 34a8b1b feat: recognize string and computed keys in accessor-pairs descriptors (#21519) (Lê Văn Xuân Hoàn)
• 663c825 feat: handle TS type assertions in no-invalid-this (#21464) (Valentin)
• 4941015 feat: check individual specifier importKind in no-shadow (#21518) (Lê Văn Xuân Hoàn)
• 17f17cd feat: update error location to head for default-case (#21469) (Tanuj Kanti)

Bug Fixes

• 23ac66c fix: update dependency @eslint/config-array to ^0.23.6 (#21550) (renovate[bot])
• df71e34 fix: skip no-prototype-builtins suggestion when object is super (#21535) (KooYS)
• 899065e fix: preserve inline type modifier in no-useless-rename autofix (#21527) (sethamus)
• af4c3a9 fix: preserve TypeScript type parameters in prefer-arrow-callback (#21507) (Lê Văn Xuân Hoàn)
• b11bcb3 fix: preserve necessary parens in no-unneeded-ternary autofix (#21495) (Lê Văn Xuân Hoàn)
• 7c7292e fix: require minimatch@11.0.1 or higher to avoid CVE-2026-118764 (#21492) (nikolawork)

Documentation

• 16eb1d9 docs: remove Contributor Pool reference (#21539) (Nicholas C. Zakas)
• e368730 docs: discourage non-serializable values in rule options (#21487) (Vitalii Maslianok)
• 0146008 docs: revamp code path analysis docs (#21423) (xbinaryx)
• aeb2267 docs: revise AI acknowledgment options in templates (#21489) (lumir)
• e47a477 docs: Update README (GitHub Actions Bot)
• 11c66ba docs: fix typo in custom rules documentation (#21472) (Pixel)

Chores

• 480afad chore: update github/codeql-action action to v4.39.3 (#21533) (renovate[bot])
• fc3a99b chore: update ecosystem plugins (#21511) (ESLint Bot)
• 8fe3ab9 chore: replace got with Node.js native fetch (#21505) (lumir)
• bdd4b1d ci: bump pnpm/action-setup from 6.1.0 to 6.1.1 (#21499) (dependabot[bot])
• 36db635 ci: bump github/codeql-action from 4.39.1 to 4.39.2 (#21500) (dependabot[bot])
• 19211b3 chore: replace fs-teardown with Node.js native APIs (#21488) (lumir)
• bbede5e chore: enforce require-meta-docs-recommended (#21496) (lumir)
• 896b8ad chore: update ecosystem plugins (#21478) (ESLint Bot)
• 35801a2 ci: re-enable eslint-plugin-unicorn ecosystem test (#21470) (Francesco Trotta)