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chore: simplify <pre> cleaning #15980

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Merged
merged 1 commit into from
May 21, 2025
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chore: simplify <pre> cleaning #15980

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5 changes: 5 additions & 0 deletions .changeset/fifty-llamas-know.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'svelte': patch
---

chore: simplify `<pre>` cleaning
17 changes: 5 additions & 12 deletions packages/svelte/src/compiler/phases/3-transform/utils.js
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Expand Up @@ -271,19 +271,12 @@ export function clean_nodes(

var first = trimmed[0];

// initial newline inside a `<pre>` is disregarded, if not followed by another newline
// if first text node inside a <pre> is a single newline, discard it, because otherwise
// the browser will do it for us which could break hydration
if (parent.type === 'RegularElement' && parent.name === 'pre' && first?.type === 'Text') {
const text = first.data.replace(regex_starts_with_newline, '');
if (text !== first.data) {
const tmp = text.replace(regex_starts_with_newline, '');
if (text === tmp) {
first.data = text;
first.raw = first.raw.replace(regex_starts_with_newline, '');
if (first.data === '') {
trimmed.shift();
first = trimmed[0];
}
}
if (first.data === '\n' || first.data === '\r\n') {
trimmed.shift();
first = trimmed[0];
}
}

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