stream: rewrite WHATWG Stream in C++#63872

Draft

mcollina wants to merge 45 commits into

nodejs:mainfrom

mcollina:webstreams-cpp

Commits on Jun 8, 2026

src: add C++ webstreams binding + ReadableStream default object model

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src: add C++ ReadableByteStream object model (BYOB)

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Commits on Jun 9, 2026

src: add C++ WritableStream object model

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src: add C++ TransformStream object model

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src: expose webstreams C++ constructors for the public flip

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src: add webstreams introspection + size-mode groundwork for the flip

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WIP src: flip webstreams public API to the C++ engine (NOT yet green)

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WIP src: webstreams flip now passes the full WPT streams suite

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src: make webstreams native methods throw ERR_INVALID_THIS

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src: show stream in TransformStreamDefaultController inspect

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test,src: de-couple test-whatwg-writablestream from kState

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src,test: fix nested transferable streams; de-couple byte/transfer tests

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src,test: de-couple test-whatwg-readablestream from kState; validate pipeTo args

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src: guard webstreams JSTransferable bridge against a null host object

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Commits on Jun 10, 2026

Commits on Jun 11, 2026

Commits on Jun 12, 2026