[v4] JavaScript config with tailwind-plugin.js treat addComponent as addUtilities

[minimit]

What version of Tailwind CSS are you using?

4.0.0-beta.3

What build tool (or framework if it abstracts the build tool) are you using?

    "@tailwindcss/postcss": "^4.0.0-beta.3",
    "postcss": "^8.4.49",
    "postcss-cli": "^11.0.0",
    "tailwindcss": "^4.0.0-beta.3"

What version of Node.js are you using?

v22.11.0

What browser are you using?

Chrome

What operating system are you using?

macOS

Reproduction URL

https://github.com/minimit/twbug-add-components

Describe your issue

npm install and npm run test

addComponents gives error on complex styles, it should compile

Error: `addUtilities({ '@media (prefers-reduced-motion: reduce)' : … })` defines an invalid utility selector. Utilities must be a single class name and start with a lowercase letter, eg. `.scrollbar-none`.

[philipp-spiess]

@minimit Hey! Yeah the utility name must be first in v4 right now, you can get the example you posted working by inverting the media query with the class rule:

addComponents({
  '.custom': {
    '@media (prefers-reduced-motion: reduce), (update: slow)': {
      color: 'red',
    },
  },
})

Are you running into plugins like this in the wild while upgrading from v3?

[minimit]

@minimit Hey! Yeah the utility name must be first in v4 right now, you can get the example you posted working by inverting the media query with the class rule:

addComponents({
  '.custom': {
    '@media (prefers-reduced-motion: reduce), (update: slow)': {
      color: 'red',
    },
  },
})

Are you running into plugins like this in the wild while upgrading from v3?

Thanks

Yes I'm trying to update from v3 to v4 my plugins, anyway now I've the problem that !important is not supported in utilities.