ESLint v8.46.0 released

Highlights

Support for regular expressions v flag

We have updated ESLint to fully support the ECMAScript 2024 regular expression v flag. This flag allows more complex operations such as difference/subtraction, intersection, and nested character classes. These updates include parsing and ensuring that rules related to regular expressions are behaving as expected.

Better error messages for flat config

As we continue to work on flat config, we received some feedback that the error messages were a bit difficult to understand when an eslintrc config was accidentally used. We added more explicit checking for eslintrc-style configs to output more useful error messages that include links to the relevant documentation.

Features

• 8a93438 feat: require-unicode-regexp support v flag (#17402) (SUZUKI Sosuke)
• 1a2f966 feat: no-useless-escape support v flag (#17420) (Yosuke Ota)
• ee68d1d feat: no-empty-character-class support v flag (#17419) (Milos Djermanovic)
• 853d32b feat: deprecate no-return-await (#17417) (Carlos Lopez)
• d4f02e4 feat: no-control-regex support v flag (#17405) (Yosuke Ota)
• 2a35f3e feat: prefer-named-capture-group support v flag (#17409) (Yosuke Ota)
• 8ca8b50 feat: Better error message for flat config plugins (#17399) (Nicholas C. Zakas)
• 509f753 feat: no-misleading-character-class support v flag (#17406) (Yosuke Ota)
• 3caf514 feat: no-regex-spaces support v flag (#17407) (Yosuke Ota)
• b7fad2b feat: prefer-regex-literals support v flag (#17410) (Yosuke Ota)
• a6a3ad4 feat: no-useless-backreference support v flag (#17408) (Yosuke Ota)
• 94954a7 feat: no-invalid-regexp support v flag (#17404) (Yosuke Ota)
• 1af6eac feat: adds option for allowing empty object patterns as parameter (#17365) (Tanuj Kanti)
• cf03104 feat: Improve config error messages (#17385) (Nicholas C. Zakas)

Bug Fixes

• 9803c7c fix: FlatESLint#getRulesMetaForResults shouldn’t throw on unknown rules (#17393) (Milos Djermanovic)
• 42faa17 fix: Update no-loop-func to not overlap with no-undef (#17358) (Matt Wilkinson)

Documentation

• 4d474e3 docs: update with TypeScript info (#17423) (James)
• 091f44e docs: File extension named processor deprecation (#17362) (Matt Wilkinson)
• 9254a6c docs: Update README (GitHub Actions Bot)
• 6d6dc51 docs: fix overlapping of open in playground button (#17403) (Tanuj Kanti)
• 7fc3a2c docs: Add private class features info to no-underscore-dangle (#17386) (Matt Wilkinson)
• da73e58 docs: Migrating eslint-env configuration comments (#17390) (Francesco Trotta)
• 80dffed docs: fix Ignoring Files section in config migration guide (#17392) (Milos Djermanovic)
• 8a9abb7 docs: Update README (GitHub Actions Bot)
• 7e9be4b docs: Update README (GitHub Actions Bot)
• 0b0bbe0 docs: Update README (GitHub Actions Bot)

Chores

• d1eb7e4 chore: Update ecosystem dependencies (#17427) (Nicholas C. Zakas)
• fab9e97 chore: package.json update for eslint-config-eslint release (ESLint Jenkins)
• 6246711 chore: package.json update for @eslint/js release (ESLint Jenkins)
• 0aa0bc3 chore: Add PRs to triage project (#17421) (Nicholas C. Zakas)