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fix: set Root start/end to null when fragment contains only whitespace #17125

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fix: set Root start/end to null when fragment contains only whitespace #17125

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fix: set Root start/end to null when fragment contains only whitespace
ryanatkn Nov 7, 2025
a81eabc
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ryanatkn Nov 7, 2025
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5 changes: 5 additions & 0 deletions .changeset/fruity-knives-ring.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'svelte': patch
---

fix: set Root start/end to null when fragment contains only whitespace
5 changes: 4 additions & 1 deletion packages/svelte/src/compiler/phases/1-parse/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -115,7 +115,10 @@ export class Parser {
e.unexpected_eof(this.index);
}

if (this.root.fragment.nodes.length) {
const has_content = this.root.fragment.nodes.some(
(node) => node.type !== 'Text' || node.data.trim().length > 0
);
if (has_content) {
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@ryanatkn ryanatkn Nov 7, 2025

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alternatively, less explicit/clear and more defensive:

if (this.root.fragment.nodes.length) {
	// ...

	if (start <= end) {
		this.root.start = start;
		this.root.end = end;
	} else {
		// @ts-ignore
		this.root.start = this.root.end = null;
	}
} else {
	// @ts-ignore
	this.root.start = this.root.end = null;
}

let start = /** @type {number} */ (this.root.fragment.nodes[0].start);
while (regex_whitespace.test(template[start])) start += 1;

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6 changes: 6 additions & 0 deletions packages/svelte/tests/parser-modern/samples/script-style-no-markup/input.svelte
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@@ -0,0 +1,6 @@
<script>
// script and style but no markup
</script>
<style>
div { color: red; }
</style>
112 changes: 112 additions & 0 deletions packages/svelte/tests/parser-modern/samples/script-style-no-markup/output.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1,112 @@
{
"css": {
"type": "StyleSheet",
"start": 54,
"end": 91,
"attributes": [],
"children": [
{
"type": "Rule",
"prelude": {
"type": "SelectorList",
"start": 63,
"end": 66,
"children": [
{
"type": "ComplexSelector",
"start": 63,
"end": 66,
"children": [
{
"type": "RelativeSelector",
"combinator": null,
"selectors": [
{
"type": "TypeSelector",
"name": "div",
"start": 63,
"end": 66
}
],
"start": 63,
"end": 66
}
]
}
]
},
"block": {
"type": "Block",
"start": 67,
"end": 82,
"children": [
{
"type": "Declaration",
"start": 69,
"end": 79,
"property": "color",
"value": "red"
}
]
},
"start": 63,
"end": 82
}
],
"content": {
"start": 61,
"end": 83,
"styles": "\n\tdiv { color: red; }\n",
"comment": null
}
},
"js": [],
"start": null,
"end": null,
"type": "Root",
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Contributor Author

@ryanatkn ryanatkn Nov 7, 2025 •
edited
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before the fix:

	"js": [],
	"start": 54,
	"end": 53,
	"type": "Root",

"fragment": {
"type": "Fragment",
"nodes": [
{
"type": "Text",
"start": 53,
"end": 54,
"raw": "\n",
"data": "\n"
}
]
},
"options": null,
"instance": {
"type": "Script",
"start": 0,
"end": 53,
"context": "default",
"content": {
"type": "Program",
"start": 8,
"end": 44,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 3,
"column": 0
}
},
"body": [],
"sourceType": "module",
"trailingComments": [
{
"type": "Line",
"value": " script and style but no markup",
"start": 10,
"end": 43
}
]
},
"attributes": []
}
}
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