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This PR is an optimization where it will not emit empty rules and at-rules. I noticed this while working on https://github.com/tailwindlabs/tailwindcss/pull/16120 where we emitted: ```css :root, :host { } ``` There are some exceptions for "empty" at-rules, such as: ```css @charset "UTF-8"; @layer foo, bar, baz; @custom-media --modern (color), (hover); @namespace "http://www.w3.org/1999/xhtml"; ``` These don't have a body, but they still have a purpose and therefore they will be emitted. However, if you look at this: ```css /* Empty rule */ .foo { } /* Empty rule, with nesting */ .foo { .bar { } .baz { } } /* Empty rule, with special case '&' rules */ .foo { & { &:hover { } &:focus { } } } /* Empty at-rule */ @media (min-width: 768px) { } /* Empty at-rule with nesting*/ @media (min-width: 768px) { .foo { } @media (min-width: 1024px) { .bar { } } } ``` None of these will be emitted. --------- Co-authored-by: Jordan Pittman <jordan@cryptica.me>
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