Re: [whatwg/streams] Garbage-free streaming fetch into a WebAssembly (Shared)ArrayBuffer? (#1057)

> I wonder if there would be a way to get to a JS GC free + zero copy way of downloading files?

At least in Chrome, our goal is not to eliminate GC but to use generational GC so that as long as there is only a small number of short-lived objects generated, you won't see any GC pauses. You can track the progress of this effort here: https://bugs.chromium.org/p/chromium/issues/detail?id=1029379.

The streams standard creates lots of short-lived promises internally. It's theoretically possible to eliminate those promises for platform-generated streams, but in practice we don't because it would add a lot of complexity to the implementation. Instead we rely on the lower-level GC to be efficient.

I don't know about other browsers, but I suspect they are also working on ways of letting JavaScript interface with WebAssembly while avoiding GC pauses from temporary objects.


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