Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: effa01300ea148c421201ec6a937e852c2da1da1
      
https://github.com/WebKit/WebKit/commit/effa01300ea148c421201ec6a937e852c2da1da1
  Author: Youenn Fablet <[email protected]>
  Date:   2026-01-30 (Fri, 30 Jan 2026)

  Changed paths:
    M Source/WebCore/Modules/streams/ReadableStream.cpp
    M Source/WebCore/Modules/streams/ReadableStream.h
    M Source/WebCore/Modules/streams/ReadableStreamInternals.js
    M Source/WebCore/bindings/js/InternalReadableStream.cpp
    M Source/WebCore/bindings/js/InternalReadableStream.h

  Log Message:
  -----------
  Add support for constructing ReadableStream with ReadableStreamSource with a 
custom highWaterMark
rdar://169090043
https://bugs.webkit.org/show_bug.cgi?id=306422

Reviewed by Chris Dumez.

ReadableStream.from requires to build a ReadableStream with a highWaterMark of 
0.
We then need to build a ReadableStream from a ReadableStreamSource with a 
custom highWaterMark.
We update ReadableStream::create, 
InternalReadableStream::createFromUnderlyingSource and 
createInternalReadableStreamFromUnderlyingSource to do so.
This will be covered by tests after the follow-up PR that will implement 
ReadableStream.from.

Canonical link: https://commits.webkit.org/306478@main



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