Tailwind 4 does not read classes from third part library

[FilipBrannlund]

I'm using a next 15 application with postcss and having problem that TW does not fetch/read the TW classes that my third part library uses.

I have a package named Button that uses following TW classes. text-2xl py-2

When I render the component text-2xl and py-2 is not applied.
e.g <Button size="xl">Test</Button>
But if I make a p-tagg that uses text-2xl and py-2 tailwind loads the classes and they are applied on Both p tag and Button.

<!-- Button now is displayed with text-2xl and py-2 -->
<Button size="xl">Test</Button>
<p className="text-2xl py-2">Hello</p>

postcss.config.mjs

const config = {
  plugins: {
    "@tailwindcss/postcss": {},
  },
};
export default config;

Seems like I have to point to tailwind to look for classes in node_modules?

[wongjn]

Yes, you'd use the @source directive to look for classes in node_modules if you have node_modules in your .gitignore:

@source "../path/to/node_modules/library";