924dd69bdb
This PR fixes an issue where an empty selector list was valid when
defining a `@custom-variant`.
Given this input:
```css
@custom-variant foo ();
```
If you then use it with a utility such as `foo:flex`, then the following
(incorrect) CSS was generated:
```css
.foo\:flex {
{
display: flex;
}
}
```
Which is invalid CSS. This PR will now validate that that we have at
least _something_ and show an error accordingly.
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| @tailwindcss-browser | ||
| @tailwindcss-cli | ||
| @tailwindcss-node | ||
| @tailwindcss-postcss | ||
| @tailwindcss-standalone | ||
| @tailwindcss-upgrade | ||
| @tailwindcss-vite | ||
| internal-example-plugin | ||
| tailwindcss | ||
| tsconfig.base.json | ||