[WIP] The Great Streams Consolidation of 2026#6706

Draft

jasnell wants to merge 47 commits intomainfrom

jasnell/the-great-streams-consolidation-of-2026

Commits on May 4, 2026

Expand JsArrayBuffer/Uint8Array/BufferSource APIs
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No jsg::BufferSource in vfs
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No jsg::BufferSource in modules-new
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No jsg::Buffersource in readAllBytes
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Move BYOB views away from using jsg::BufferSource
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Moving writable away from jsg::BufferSource
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No BufferSource in writable-sink-adapter
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No jsg::BufferSource in readable-source-adapter
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No jsg::BufferSource in encoding.c++
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Move streams away from jsg::BufferSource and use jsg::Js* types
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Apply a couple fixups
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Replace WritableImpl::Algorithms with UnderlyingSinkImpl
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Restructure WritableStreamJsController setup
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Modify the WritableStreamJsController setup to accept sink impl
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Add alternative internal writable stream implementation
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Add PersistentContinuation mechanism to jsg/promise.h
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Use persistent promise continuations in standard.c++
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Implement a simple write fast path
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Add writev optimization for js-backed streams
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Implement writev optimization for WritableStreamJsController
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Implement flush in WritableStreamJsController
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Additional minor cleanups and improvements
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Add UnderlyingSourceImpl
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Implement InternalUnderlyingSourceImpl
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Use the persistent continuation mechanism for pull
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Introduce TransformerImpl
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Update transforms to use persistent continuations
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Minor flags optimization in TransformStreamDefaultController
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Add transformv optimization path
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Remove the enable draining read autogate and legacy path
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Use persistent continuations in writable pipeloop
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Fixup tests and asan failures with the new optimizations
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Fixup linting issues
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Have draining read using persistent continuations
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Update standard AllReader to use persistent continuations
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Update drainingReads to use persistent continuations
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Replace bool args with WD_STRONG_BOOLS in streams
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Update some out of date code comments
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Implement multiple fast-paths for internal-backed streams
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Finish closing gaps between standard/internal stream impls
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Switch some of the bool fields to packed structs
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Address multiple review findings
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Apply additional cleanups
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Add transformv algorithm to text encoder and decoder streams
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Additioanl streams cleanups/improvements
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Improve ReadableStream.from and async generator support
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Switch from js.tryCatch to JSG_TRY/JSG_CATCH
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