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Drop exact duplicate declarations from output CSS within a style rule #18809

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Merged
merged 4 commits into from
Aug 29, 2025
Merged

Drop exact duplicate declarations from output CSS within a style rule #18809

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9c34083
Refactor
thecrypticace Aug 27, 2025
4660037
Remove duplicate declarations in the same rule
thecrypticace Aug 27, 2025
2b5ff74
Update tests
thecrypticace Aug 27, 2025
bff4c7b
Update changelog
thecrypticace Aug 27, 2025
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Refactor
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@thecrypticace
thecrypticace committed Aug 27, 2025
commit 9c340832b2a1e9c7859bc5717af04530fa088301
29 changes: 11 additions & 18 deletions packages/tailwindcss/src/ast.ts
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Expand Up @@ -351,26 +351,19 @@ export function optimizeAst(

// Rule
else if (node.kind === 'rule') {
// Rules with `&` as the selector should be flattened
if (node.selector === '&') {
for (let child of node.nodes) {
let nodes: AstNode[] = []
transform(child, nodes, context, depth + 1)
if (nodes.length > 0) {
parent.push(...nodes)
}
}
let nodes: AstNode[] = []

for (let child of node.nodes) {
transform(child, nodes, context, depth + 1)
}

//
else {
let copy = { ...node, nodes: [] }
for (let child of node.nodes) {
transform(child, copy.nodes, context, depth + 1)
}
if (copy.nodes.length > 0) {
parent.push(copy)
}
if (nodes.length === 0) return

// Rules with `&` as the selector should be flattened
if (node.selector === '&') {
parent.push(...nodes)
} else {
parent.push({ ...node, nodes })
}
}

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