This directory contains files from several different implementations and implementation strategies:

Traditional ReadableStream Implementation

• ReadableByteStream.{cpp,h,idl}
• ReadableByteStreamReader.{h,idl}
• ReadableStream.{cpp,h,idl}
• ReadableStreamImpl.h
• ReadableStreamReader.{cpp,h,idl}
• ReadableStreamReaderTest.cpp
• ReadableStreamTest.cpp
• UnderlyingSource.h

These files implement the current streams spec, plus the more speculative ReadableByteStream, to the extent necessary to support Fetch response bodies. They do not support author-constructed readable streams. They use the normal approach for implementing web-exposed classes, i.e. IDL bindings with C++ implementation. They are now deprecated and will be removed shortly. See https://crbug.com/613435.

V8 Extras ReadableStream Implementation

• ByteLengthQueuingStrategy.js
• CountQueuingStrategy.js
• ReadableStream.js
• ReadableStreamController.h
• UnderlyingSourceBase.{cpp,h,idl}
• bindings/core/v8/ReadableStreamOperations.{cpp,h}

These files implement V8 extras based ReadableStream which is currently used.

Old streams

• Stream.{cpp,h,idl}

These files support an old streams spec. They should eventually be removed, but right now XMLHttpRequest and Media Streams Extension code in Blink still depends on them.