[Bug]: medusa/ui breaks with tailwindcss v4

[pnodet]

env

❯ npx envinfo --system --binaries --browsers --npmPackages "{@medusajs/*,tailwindcss,@tailwindcss/*,postcss-mixins}"

  System:
    OS: macOS 15.2
    CPU: (14) arm64 Apple M4 Pro
    Memory: 68.72 MB / 24.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.13.0 - ~/.local/state/fnm_multishells/8096_1736968971589/bin/node
    npm: 10.9.2 - ~/.local/state/fnm_multishells/8096_1736968971589/bin/npm
    pnpm: 9.15.4 - ~/.local/state/fnm_multishells/8096_1736968971589/bin/pnpm
    bun: 1.1.43 - /opt/homebrew/bin/bun
  Browsers:
    Chrome: 132.0.6834.84
    Safari: 18.2
  npmPackages:
    @medusajs/ui: 4.0.3 => 4.0.3
    @medusajs/ui-preset: 2.3.0 => 2.3.0
    @tailwindcss/postcss: 4.0.0-beta.8 => 4.0.0-beta.8
    tailwindcss: 4.0.0-beta.8 => 4.0.0-beta.8

Node.js version

v22.13.0

What happended?

tailwindcss v4 is currently in beta and contains some changes. Apart from some behavior differences medusa/ui could work with it if configured correctly.

However among the changes made the tailwindcss package does not include the defaultTheme export which breaks since medusa/ui imports it.

[christiananese]

Hey @pnodet
thanks for your PR.

Usually we don't make any changes to support beta versions of our dependencies, i.e. they might still change and introduce a defaultTheme for their final release. This particular change should be fine for the future, so we'll discuss this internally and might merge it.

I'll come back to you as soon as we have decided on how to proceed with this.

[pnodet]

Hey @christiananese
sure.

I fully understand your position, we applied the PR changes via patch-package on our project so:

• I don't need this PR to be implemented right now
• I can confirm that is solves the issue and works fine.

Since this change is quite trivial I figured it would be mergeable as is and I also don't think the defaultTheme is going to change.

[pnodet]

This doesn't look beta anymore!

https://www.npmjs.com/package/tailwindcss?activeTab=versions

[christiananese]

This doesn't look beta anymore!

https://www.npmjs.com/package/tailwindcss?activeTab=versions

Nice! Thank you @pnodet. 💪