2012/12/21 Allen Wirfs-Brock <[email protected]> > > On Dec 21, 2012, at 7:01 AM, Tom Van Cutsem wrote: > > I think that with the provision of the Handler API, we provide Proxy > authors with the same benefits than if we would add delegation to the ES6 > built-ins, without any required changes to existing internal methods for > normal Objects. > > > Yes, I generally agree that Handler is a way out of this. But if that is > our solution to the problem then I still think we have a usability issue > with the current Proxy API design. >
The usability cuts both ways: in the old Proxy API the fundamental vs. derived trap distinction was baked-in, but you had to explicitly implement *all* fundamental traps before you had a complete object abstraction. Direct proxies are generally simpler to get started with, but there are pitfalls when implementing only some of the traps. We previously agreed that this is a known problem in OO frameworks. I'm not sure whether there's a silver bullet here. I think the best we can do is to provide adequate documentation of the dependencies, and point out the added value of subclassing Handler. Cheers, Tom
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