Svelte disrespects line break entities, regardless of `preserveWhitespace` option

[brunnerh]

Describe the bug

Line feed entities (
) are turned into spaces.

Reproduction

<script>
	import Component from './Component.svelte';
</script>

<!-- Has no line breaks -->
<span title="A&#x0A;B">in title</span>
<Component text="A&#x0A;B" />

<!-- Has line break -->
<Component text={'A\nB'} />

<!-- Component.svelte -->
<script>
	const { text } = $props();
	console.log(JSON.stringify(text));
</script>
<pre>{text}</pre>

Playground

Logs

System Info

REPL

Severity

annoyance

[harrisi]

Attributes do seem to respect carriage returns, interestingly.

[KTibow]

Likely culprit:

svelte/packages/svelte/src/compiler/phases/1-parse/utils/html.js

Line 79 in 6d195f0

if (code === 10) {

Workarounds:

• use 
 instead of 

• use ={"A\nB"} instead of ="A
B"