ESLint

Just released:

eslint/mcp v0.1.1
https://github.com/eslint/rewrite/releases/tag/mcp-v0.1.1

css-tree 3.6.3 is out!

🔧 Expanded support for nested CSS combinator selectors in block parsing

Details:
https://github.com/eslint/csstree/releases/tag/css-tree-v3.6.3

The RFC 'feat: Allow rules to specify languages they work on' has been approved and merged!

https://github.com/eslint/rfcs/pull/135

GitHub - JulianCataldo/eslint-plugin-markdown-frontmatter-schema: Validate YAML frontmatter in your Markdown files using JSON Schema — right in ESLint. Validate YAML frontmatter in your Markdown files using JSON Schema — right in ESLint. - JulianCataldo/eslint-plugin-markdown-frontmatter-schema

I'm about to release this port of my remark-lint rule plugin for validating YAML markdown frontmatter with JSON schemas.

The recent addition of Markdown to official ESLint parsers is a blast!
Was silky smooth to build, freeing time to add improvements to the old code
github.com/JulianCatald...

ESLint v9.32.0 has been released!

https://eslint.org/blog/2025/07/eslint-v9.32.0-released/

eslint/create-config v1.10.0 has been released:

https://github.com/eslint/create-config/releases/tag/v1.10.0

ESLint Markdown 7.1.0 is out!

✨ New checkMissingCells option for table-column-count
🔧 Case-insensitive attribute checks in no-missing-link-fragment
🐞 Updated plugin-kit to fix security issues

Details:
https://github.com/eslint/markdown/releases/tag/v7.1.0

eslint/json 0.13.1 has been released!

🔧 Updated plugin-kit to latest for security improvements

Details:
https://github.com/eslint/json/releases/tag/json-v0.13.1

Just released:

eslint/plugin-kit v0.3.4
https://github.com/eslint/rewrite/releases/tag/plugin-kit-v0.3.4

css-tree 3.6.2 has been released!

🐞 Reverted removal of outdated @font-face unicode-range support

Details:
https://github.com/eslint/csstree/releases/tag/css-tree-v3.6.2

The RFC 'feat: Allow rules to specify languages they work on' is now in the Final Commenting phase.

https://github.com/eslint/rfcs/pull/135

ESLint v9.31.0 has been released:

https://eslint.org/blog/2025/07/eslint-v9.31.0-released/

The RFC 'feat: add assertion options to RuleTester' is now in the Initial Commenting phase.

https://github.com/eslint/rfcs/pull/137

ESLint Markdown 7.0.0 is out!

✨ New no-unused-definitions rule
✨ Added options for no-empty-definitions
🔧 no-missing-link-fragments now ignores case by default

Details:
https://github.com/eslint/markdown/releases/tag/v7.0.0

eslint/json 0.13.0 has been released!

✨ Added `url` and `recommended` fields to rules
✨ New token methods in JSONSourceCode

Details:
https://github.com/eslint/json/releases/tag/json-v0.13.0

eslint/css 0.10.0 is out!

✨ New rules: no-invalid-named-grid-areas & no-invalid-at-rule-placement
🔧 Added allowUnknownVariables option to no-invalid-properties
⚠️ Dropped Tailwind syntax for external tailwind-csstree

Details:
https://github.com/eslint/css/releases/tag/css-v0.10.0

It's hard to believe @eslint.org is 12 years old! June 29, 2013 marks my first commit to a project call JSCheck. I would later rename it to ESLint.

https://github.com/eslint/eslint/commit/a658d7b0e7d915750f18d666823d54ef2129a9af

ESLint v9.30.1 has been released:

https://eslint.org/blog/2025/07/eslint-v9.30.1-released/

ESLint v9.30.0 has been released:

https://eslint.org/blog/2025/06/eslint-v9.30.0-released/

The RFC 'feat: CSS variable tracking' is now in the Initial Commenting phase.

https://github.com/eslint/rfcs/pull/136

eslint/markdown 6.6.0 is here!

✨ New rules: no-bare-urls, no-missing-link-fragments, no-reversed-media-syntax
🔧 JSON frontmatter support added
🔧 no-duplicate-headings option checkSiblingsOnly added

Details:
https://github.com/eslint/markdown/releases/tag/v6.6.0

The RFC 'feat: Allow rules to specify languages they work on' is now in the Initial Commenting phase.

https://github.com/eslint/rfcs/pull/135

Want to get involved with ESLint? Here's a good first issue:
https://github.com/eslint/eslint/issues/19848

Nice, it's ~3.8x faster on Node.js main branch! (I edited the linting command in Makefile after pulling in the PR)

Linting our biggest codebase with a bunch of rules (including many custom ones) currently takes about 38s.

Adding `--concurrency=auto` dropped it to 12 seconds.

Can't wait for this to be released.

ESLint v9.29.0 has been released: https://eslint.org/blog/2025/06/eslint-v9.29.0-released/

eslint/css 0.9.0 is out!

✨ Added relative-font-units rule
✨ Validate property values with variables
🔧 Upgraded @eslint/css-tree for better syntax support

Details:
https://github.com/eslint/css/releases/tag/css-v0.9.0

This would be perfect, thank you! 🙏

How ESLint language plugins enhance DSL usability - ESLint - Pluggable JavaScript Linter A pluggable and configurable linter tool for identifying and reporting on patterns in JavaScript. Maintain your code quality with ease.

Does your project have a DSL? Creating an ESLint language plugin enhance your developer experience. Read about the benefits in our latest post.

eslint.org/blog/2025/06...

feat: multithread linting by fasttime · Pull Request #19794 · eslint/eslint Prerequisites checklist I have read the contributing guidelines. What is the purpose of this pull request? (put an "X" next to an item) [ ] Documentation update [ ] Bug fix (template)...

Do you use ESLint in a large repo (more than 1,000 files)? We'd love your feedback on this parallel linting prototype.

github.com/eslint/eslin...