ESLint v9.10.0 released

Highlights

Types now included

We’ve been receiving complaints about the @types/eslint package not being updated after the v9 release. While we did do an initial update to the package for v9, it quickly became apparent that regular updates to that package could not be accomplished in a timely manner. Ultimately, we decided that the only way for us to provide the type of experience we want for ESLint is to take complete ownership of the type definitions.

As a result, beginning with this release, the eslint package now publishes its own types. To start, we’ve copied the type definitions from @types/eslint in order to provide a smooth transition. (There was one bug in the types that we fixed, but otherwise it’s the same type definitions.) Going forward, we’ll continue to iterate and improve the type definitions as part of our regular release cycle.

We’re grateful to everyone who contributed types to the @types/eslint package at a time when we weren’t ready to take that work on.

Other notable changes

• The require-unicode-regexp rule can now enforce usage of the v flag with regular expressions. Check out the new option requireFlag.
• This release also fixes problems found in the id-length and no-invalid-regexp rules.

Features

• 301b90d feat: Add types (#18854) (Nicholas C. Zakas)
• bcf0df5 feat: limit namespace import identifier in id-length rule (#18849) (ChaedongIm)
• 45c18e1 feat: add requireFlag option to require-unicode-regexp rule (#18836) (Brett Zamir)
• 183b459 feat: add error message for duplicate flags in no-invalid-regexp (#18837) (Tanuj Kanti)
• c69b406 feat: report duplicate allowed flags in no-invalid-regexp (#18754) (Tanuj Kanti)

Documentation

• bee0e7a docs: update README (#18865) (Milos Djermanovic)
• 5d80b59 docs: specify that ruleId can be null in custom formatter docs (#18857) (Milos Djermanovic)
• 156b1c3 docs: Update README (GitHub Actions Bot)
• f6fdef9 docs: Update README (GitHub Actions Bot)
• a20c870 docs: Update README (GitHub Actions Bot)
• 90e699b docs: Update README (GitHub Actions Bot)

Chores

• 24c3ff7 chore: upgrade to @eslint/js@9.10.0 (#18866) (Francesco Trotta)
• 1ebdde1 chore: package.json update for @eslint/js release (Jenkins)
• e8fc5bd chore: update dependency @eslint/core to ^0.5.0 (#18848) (renovate[bot])
• 343f992 refactor: don’t use node.value when removing unused directives (#18835) (Milos Djermanovic)
• 3db18b0 refactor: Extract FileContext into class (#18831) (Nicholas C. Zakas)
• 931d650 refactor: Use @eslint/plugin-kit (#18822) (Nicholas C. Zakas)
• ed5cf0c chore: update dependency @eslint/json to ^0.4.0 (#18829) (Milos Djermanovic)
• d1f0831 chore: added missing ids (#18817) (Strek)
• ec92813 refactor: Config class (#18763) (Nicholas C. Zakas)