What changed in tailwind-merge from 2 to 3

New Features

• Add support for Tailwind CSS v4.3 by @dcastil in https://github.com/dcastil/tailwind-merge/pull/677
  • Add postfixLookupClassGroups option to config to support Tailwind utilities where a slash is part of the full class name, like named container queries
• Add support for readonly array values by @unional in https://github.com/dcastil/tailwind-merge/pull/652

Documentation

• Fix broken links in README by @maurer2 in https://github.com/dcastil/tailwind-merge/pull/662

Other

• Harden internal CI pipeline security by omitting git checkout by @dcastil, suggested by @kyletaylored in https://github.com/dcastil/tailwind-merge/commit/6b2499c10cf52bed42426d30b4219e90374b30d6

Full Changelog: https://github.com/dcastil/tailwind-merge/compare/v3.5.0...v3.6.0

Thanks to @brandonmcconnell, @manavm1990, @langy, @roboflow, @syntaxfm, @getsentry, @codecov, a private sponsor, @block, @openclaw, @sourcegraph, @mike-healy and more via @thnxdev for sponsoring tailwind-merge! ❤️

New Features

• Add support for Tailwind CSS v4.2 by @dcastil in https://github.com/dcastil/tailwind-merge/pull/651

Full Changelog: https://github.com/dcastil/tailwind-merge/compare/v3.4.1...v3.5.0

Thanks to @brandonmcconnell, @manavm1990, @langy, @roboflow, @syntaxfm, @getsentry, @codecov, a private sponsor, @block, @openclaw, @sourcegraph and more via @thnxdev for sponsoring tailwind-merge! ❤️

Bug Fixes

• Prevent arbitrary font-family and font-weight from merging by @roneymoon in https://github.com/dcastil/tailwind-merge/pull/635

Full Changelog: https://github.com/dcastil/tailwind-merge/compare/v3.4.0...v3.4.1

Thanks to @brandonmcconnell, @manavm1990, @langy, @roboflow, @syntaxfm, @getsentry, @codecov, a private sponsor, @block, @openclaw, @sourcegraph and more via @thnxdev for sponsoring tailwind-merge! ❤️

New Features

• Performance optimizations which make tailwind-merge >10% faster
  • Vibe optimization by @quantizor in https://github.com/dcastil/tailwind-merge/pull/547
  • Additional optimizations by @quantizor in https://github.com/dcastil/tailwind-merge/pull/619

Documentation

• Improve docs by clarifying things, adding more examples by @dcastil in https://github.com/dcastil/tailwind-merge/pull/618
• Make examples more realistic by @dcastil in https://github.com/dcastil/tailwind-merge/pull/617
• Add custom variant as an alternative to docs by @kidonng in https://github.com/dcastil/tailwind-merge/pull/592

Other

• Improve benchmarking suite by @quantizor in https://github.com/dcastil/tailwind-merge/pull/620

Full Changelog: https://github.com/dcastil/tailwind-merge/compare/v3.3.1...v3.4.0

Thanks to @brandonmcconnell, @manavm1990, @langy, @roboflow, @syntaxfm, @getsentry, @codecov and a private sponsor for sponsoring tailwind-merge! ❤️

Bug Fixes

• Fix arbitrary value using color-mix() not being detected as color by @dcastil in https://github.com/dcastil/tailwind-merge/pull/591

Full Changelog: https://github.com/dcastil/tailwind-merge/compare/v3.3.0...v3.3.1

Thanks to @brandonmcconnell, @manavm1990, @langy, @roboflow, @syntaxfm, @getsentry, @codecov, @sourcegraph, a private sponsor, @block and @shawt3000 for sponsoring tailwind-merge! ❤️

New Features

• Add support for tailwind CSS v4.1.5 by @dcastil in https://github.com/dcastil/tailwind-merge/pull/575

Full Changelog: https://github.com/dcastil/tailwind-merge/compare/v3.2.0...v3.3.0

Thanks to @brandonmcconnell, @manavm1990, @langy, @roboflow, @syntaxfm, @getsentry, @codecov, @sourcegraph, a private sponsor and @block for sponsoring tailwind-merge! ❤️

New Features

• Add support for Tailwind CSS v4.1 by @dcastil in https://github.com/dcastil/tailwind-merge/pull/565

Full Changelog: https://github.com/dcastil/tailwind-merge/compare/v3.1.0...v3.2.0

Thanks to @brandonmcconnell, @manavm1990, @langy, @jamesreaco, @roboflow, @syntaxfm, @getsentry, @codecov, @sourcegraph and a private sponsor for sponsoring tailwind-merge! ❤️

New Features

• Add support for Tailwind CSS v4.0.10 by @dcastil in https://github.com/dcastil/tailwind-merge/pull/546

Bug Fixes

• Fix length variable in via-(length:*) class being merged with via-<color> classes accidentally by @dcastil in https://github.com/dcastil/tailwind-merge/pull/559

Documentation

• Fix typo in comment in types.ts by @roottool in https://github.com/dcastil/tailwind-merge/pull/549
• Update shadow scale recipe to tailwind merge v3 API by @dcastil in https://github.com/dcastil/tailwind-merge/pull/545

Other

• Fix metrics report action erroring on PRs from forks by @dcastil in https://github.com/dcastil/tailwind-merge/pull/551

Full Changelog: https://github.com/dcastil/tailwind-merge/compare/v3.0.2...v3.1.0

Thanks to @brandonmcconnell, @manavm1990, @langy, @jamesreaco, @roboflow, @syntaxfm, @getsentry, @codecov, @sourcegraph and a private sponsor for sponsoring tailwind-merge! ❤️

Bug Fixes

• Fix px value not being recognized for some class groups by @dcastil in https://github.com/dcastil/tailwind-merge/pull/538
• Fix doc comment being in incorrect place in default config by @gjtorikian in https://github.com/dcastil/tailwind-merge/pull/526

Full Changelog: https://github.com/dcastil/tailwind-merge/compare/v3.0.1...v3.0.2

Thanks to @brandonmcconnell, @manavm1990, @langy, @jamesreaco, @roboflow, @syntaxfm, @getsentry, @codecov, @sourcegraph and a private sponsor for sponsoring tailwind-merge! ❤️