fix(structured-clone): preserve Blob.type across structuredClone#319
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watilde wants to merge 1 commit into
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fix(structured-clone): preserve Blob.type across structuredClone#319watilde wants to merge 1 commit into
watilde wants to merge 1 commit into
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structuredClone(blob) serialized only the byte data and reconstructed
the Blob with an empty type, so structuredClone(new Blob(['x'],
{type: 'text/plain'})).type returned "" instead of "text/plain". A
Blob's type is part of its serialized state per the File API.
Append the type as a length-prefixed UTF-8 string after the byte data
on write, and read it back on read. Add an integration test covering a
typed Blob, an empty type, and content/type round-tripping.
Signed-off-by: Daijiro Wachi <daijiro.wachi@gmail.com>
andreiltd
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Jul 20, 2026
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Thanks! Could you update WPT expectations? I think the easiest way to do that is to run:
just wpt-setup
just wpt-update
This will update new passes. Also I believe the tests added here largely duplicates WPT coverage so we can drop them.
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structuredClone(blob) serialized only the byte data and reconstructed the Blob with an empty type, so structuredClone(new Blob(['x'], {type: 'text/plain'})).type returned "" instead of "text/plain". A Blob's type is part of its serialized state per the File API.
Append the type as a length-prefixed UTF-8 string after the byte data on write, and read it back on read. Add an integration test covering a typed Blob, an empty type, and content/type round-tripping.