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Closes #15219 This PR adds a new feature, `@import "…" reference` that can be used to load Tailwind CSS configuration files without adding any style rules to the CSS. The idea is that you can use this in combination with your Tailwind CSS root file when you need to have access to your full CSS config outside of the main stylesheet. A common example is for Vue, Svelte, or CSS modules: ```css @import "./tailwind.css" reference; .link { @apply underline; } ``` Importing a file as a reference will convert all `@theme` block to be `reference`, so no CSS variables will be emitted. Furthermore it will strip out all custom styles from the stylesheet. Furthermore plugins registered via `@plugin` or `@config` inside reference-mode files will not add any content to the CSS file via `addBase()`. ## Test Plan Added unit test for when we handle the import resolution and when `postcss-import` does it outside of Tailwind CSS. I also changed the Svelte and Vue integration tests to use this new syntax to ensure it works end to end. --------- Co-authored-by: Jordan Pittman <jordan@cryptica.me>