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3aa0e494bf
This PR fixes na issue where `@keyframes` were emitted if they wre in a
`@theme
reference` and anothe `@theme {}` (that is not a reference) was present.
E.g.:
```css
@reference "tailwindcss";
@theme {
/* ... */
}
```
Produces:
```css
:root, :host {
}
@keyframes spin {
to {
transform: rotate(360deg);
}
}
@keyframes ping {
75%, 100% {
transform: scale(2);
opacity: 0;
}
}
@keyframes pulse {
50% {
opacity: 0.5;
}
}
@keyframes bounce {
0%, 100% {
transform: translateY(-25%);
animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
}
50% {
transform: none;
animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
}
}
```
With this PR, the produced CSS looks like this instead:
```css
:root, :host {
}
```
Note: the empty `:root, :host` will be solved in a subsequent PR.
### Test plan
Added some unit tests, and a dedicated integration test.