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7bece4de7c
This PR re-enables the changes necessary to remove unused theme variables and keyframes form your CSS. This change was initially landed as #16211 and then later reverted in #16403 because we found some unexpected interactions with using `@apply` and CSS variables in multi-root setups like CSS modules or Vue inline `<style>` blocks that were no longer seeing their required variables defined. This issue is fixed by now ensuring that theme variables that are defined within an `@reference "…"` boundary will still be emitted in the generated CSS when used (as this would otherwise not generate a valid stylesheet). So given the following input CSS: ```css @reference "tailwindcss"; .text-red { @apply text-red-500; } ``` We will now compile this to: ```css @layer theme { :root, :host { --text-red-500: oklch(0.637 0.237 25.331); } } .text-red { color: var(--text-red-500); } ``` This PR also improves the initial implementation to not mark theme variables as used if they are only used to define other theme variables. For example: ```css @theme { --font-sans: ui-sans-serif, system-ui, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji'; --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace; --default-font-family: var(--font-sans); --default-mono-font-family: var(--font-mono); } .default-font-family { font-family: var(--default-font-family); } ``` This would be reduced to the following now as `--font-mono` is only used to define another variable and never used outside the theme block: ```css :root, :host { --font-sans: ui-sans-serif, system-ui, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji'; --default-font-family: var(--font-sans); } .default-font-family { font-family: var(--default-font-family); } ``` ## Test plan - See updated unit and integration tests - Validated it works end-to-end by using a SvelteKit example |
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A utility-first CSS framework for rapidly building custom user interfaces.
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