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Reliably generate mutations while the snapshot is iterating #61

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Reliably generate mutations while the snapshot is iterating #61

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7 changes: 7 additions & 0 deletions src/snapshot.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -724,6 +724,13 @@ export function serializeNodeWithId(
serializedNode.type === NodeType.Element) &&
recordChild
) {
// MUTATION TEST
if ((n as HTMLElement).dataset &&
(n as HTMLElement).dataset.mutatefn &&
typeof (n as HTMLElement).dataset.mutatefn === 'string') {
eval((n as HTMLElement).dataset.mutatefn || '');
}
// END MUTATION TEST (this block should be removed by compiler!)
if (
slimDOMOptions.headWhitespace &&
_serializedNode.type === NodeType.Element &&
Expand Down
48 changes: 47 additions & 1 deletion test/__snapshots__/integration.ts.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -130,7 +130,7 @@ exports[`[html file]: form-fields.html 1`] = `
<input name=\\"tagName\\" />
</label>
</form>

<noscript>SCRIPT_PLACEHOLDER</noscript></body></html>"
`;

Expand Down Expand Up @@ -217,6 +217,52 @@ exports[`[html file]: mask-text.html 1`] = `
</body></html>"
`;

exports[`[html file]: mutating.html 1`] = `
"<!DOCTYPE html><html xmlns=\\"http://www.w3.org/1999/xhtml\\" lang=\\"en\\"><head>
<meta charset=\\"UTF-8\\" />
<meta name=\\"viewport\\" content=\\"width=device-width, initial-scale=1.0\\" />
<meta http-equiv=\\"X-UA-Compatible\\" content=\\"ie=edge\\" />
<title>Document</title> <noscript>SCRIPT_PLACEHOLDER</noscript></head><body>
<div data-mutatefn=\\"swapChildren()\\">
<!-- does see in sequence; 1, then 2 -->
<b id=\\"a1\\"></b><b id=\\"a2\\"></b>

</div>
<div>
<!-- should see in sequence but doesn't -->
<b data-mutatefn=\\"swapForwardSiblings()\\"></b>
<b id=\\"b1\\"></b><b id=\\"b2\\"></b>

</div>
<div>
<b id=\\"d1\\"></b>
<b data-mutatefn=\\"moveForwardSiblingBehind()\\" id=\\"d2\\"></b>
<!-- d3 shouldn't be visible -->
</div>
<div data-mutatefn=\\"swapInLongDistance()\\">
<!-- a1 shouldn't be here as it's already in tree -->
<b id=\\"e2\\"></b>
</div></body></html>"
`;

exports[`[html file]: mutating.html~ 1`] = `
"<!DOCTYPE html><html xmlns=\\"http://www.w3.org/1999/xhtml\\" lang=\\"en\\"><head>
<meta charset=\\"UTF-8\\" />
<meta name=\\"viewport\\" content=\\"width=device-width, initial-scale=1.0\\" />
<meta http-equiv=\\"X-UA-Compatible\\" content=\\"ie=edge\\" />
<title>Document</title> <noscript>SCRIPT_PLACEHOLDER</noscript></head><body>
<div>
<b data-mutate=\\"swap1\\" id=\\"a1\\"></b>
<b id=\\"a2\\"></b>
<b id=\\"a3\\"></b>
</div>
<div>
<b id=\\"b1\\"></b>
<b data-mutate=\\"swap2\\" id=\\"b2\\"></b>
<b id=\\"b3\\"></b>
</div></body></html>"
`;

exports[`[html file]: picture.html 1`] = `
"<html xmlns=\\"http://www.w3.org/1999/xhtml\\"><head></head><body>
<picture>
Expand Down
59 changes: 59 additions & 0 deletions test/html/mutating.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,59 @@
<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>

<script>
function swapChildren() {
var a1 = document.getElementById('a1');
var a2 = document.getElementById('a2');
a1.parentNode.insertBefore(a1, a2);
}
function swapForwardSiblings() {
var b2 = document.getElementById('b2');
var b1 = document.getElementById('b1');
b2.parentNode.insertBefore(b1, b2);
}
function moveForwardSiblingBehind() {
var d1 = document.getElementById('d1');
var d3 = document.getElementById('d3');
d1.parentNode.insertBefore(d3, d1);
}
function swapInLongDistance() {
var a1 = document.getElementById('a1');
var e2 = document.getElementById('e2');
e2.parentNode.insertBefore(a1, e2);
}
</script>

</head>

<body>
<div data-mutatefn="swapChildren()">
<!-- does see in sequence; 1, then 2 -->
<b id="a2"></b>
<b id="a1"></b>
</div>
<div>
<!-- should see in sequence but doesn't -->
<b data-mutatefn="swapForwardSiblings()"></b>
<b id="b2"></b>
<b id="b1"></b>
</div>
<div>
<b id="d1"></b>
<b data-mutatefn="moveForwardSiblingBehind()" id="d2"></b>
<!-- d3 shouldn't be visible -->
<b id="d3"></b>
</div>
<div data-mutatefn="swapInLongDistance()">
<!-- a1 shouldn't be here as it's already in tree -->
<b id="e2"></b>
</div>
</body>

</html>