JSRPC: Implement serialization of Blob.#6815
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Merging this PR will degrade performance by 12.45%
Warning Please fix the performance issues or acknowledge them on CodSpeed. Performance Changes
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Registers Blob as a serializable host type (new `blob` SerializationTag), so it can be passed over built-in JSRPC and cloned via structuredClone() / postMessage(), matching the spec which lists Blob as a serializable object. It is serialized as its MIME type followed by its raw bytes. The File subclass is intentionally left non-serializable.
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jasnell
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Jun 16, 2026
Co-authored-by: James M Snell <jasnell@gmail.com>
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Makes
Blobserializable so it round-trips through JSRPC,structuredClone(), andpostMessage(), per the structured-clone spec. Serialized as MIME type + raw bytes.No new compat flag: this is net-new behavior (
Blobpreviously threw), not a breaking change, so it doesn't seem to warrant one, happy to add one if reviewers think otherwise.