We have been shipping ReadableStreams since 2018 , with today’s implementation living mostly inside of SpiderMonkey. However, we have elected to re-implement the Streams standard using DOM and WebIDL technologies, under a project called DOM Streams .
Shortly after the branch for Firefox 99 (the week of February 7th) I plan to change the implementation backing our ReadableStreams implementation from the JS implementation to DOM ReadableStreams, in Bug 1752206 . This should purely be an implementation change, causing only very small changes for users, all of which are changes more in keeping with the current standard than the JS implementation.
There is always a risk with this work, so I am writing this Intent to (re)-Ship mostly to notify so that breakage can be reported quickly.
By changing implementation technologies we will have increased our ability to easily implement the Streams standard, keep up with the specification as it evolves, and made it much more likely we’ll have the rest of the Streams implementation (WritableStreams and TransformStreams) done sooner.
I would like to extend a special thank you to Tom Schuster, Olli Pettay and Kagami Rosylight who have helped with this project.