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Ensure files with only @theme produce no output when built #18979

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Merged
thecrypticace merged 3 commits into from
Sep 22, 2025
Merged

Ensure files with only @theme produce no output when built #18979

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6e02e8a
Track use of `@theme` in features
thecrypticace Sep 22, 2025
2fd6e93
Update tests
thecrypticace Sep 22, 2025
56f0ada
Update changelog
thecrypticace Sep 22, 2025
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Track use of @theme in features 
This will ensure files that use *just* `@theme` produce no output
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@thecrypticace
thecrypticace committed Sep 22, 2025
commit 6e02e8a91793fadb5b25b5ef9243d88aface9f85
10 changes: 10 additions & 0 deletions packages/tailwindcss/src/index.test.ts
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Expand Up @@ -5965,4 +5965,14 @@ describe('feature detection', () => {
expect(compiler.features & Features.AtImport).toBeTruthy()
expect(compiler.features & Features.Utilities).toBeFalsy()
})

test('Compiling a file with only `@theme` should produce no output', async () => {
let compiler = await compile(css`
@theme {
--tracking-narrower: -0.02em;
}
`)

expect(compiler.build([])).toEqual('')
})
})
5 changes: 5 additions & 0 deletions packages/tailwindcss/src/index.ts
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Expand Up @@ -133,6 +133,9 @@ export const enum Features {

// `@variant` was used
Variants = 1 << 5,

// `@theme` was used
AtTheme = 1 << 6,
}

async function parseCss(
Expand Down Expand Up @@ -540,6 +543,8 @@ async function parseCss(
if (node.name === '@theme') {
let [themeOptions, themePrefix] = parseThemeOptions(node.params)

features |= Features.AtTheme

if (context.reference) {
themeOptions |= ThemeOptions.REFERENCE
}
Expand Down