What does it mean for an output to be effectful?
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e.g., resulting in the presentation of a new view controller, or the view model beginning a network request.
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OK. How do you express those effects as outputs in the interface?
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My point is exactly that _you don’t need to_. Why is it important? The effects are an implementation detail.
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Trying to figure out how this is different from any object which performs effects when it e.g. receives a message.
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My remaining concern is: most of most view models are totally pure. Why not isolate the impurities?
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That isolation is an implementation detail (but maybe could still be valuable), because the signal interface isolates it.
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Consumers of the signal interface don’t know or care whether it’s impure, because the effects have been isolated already.
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I definitely care whether the VM's subscription is pure for the same reason I care if a function I'm calling is pure.
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I’m not sure what “subscription” you’re referring. Signals are usually activated (directly or indirectly) by the view.
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What I mean is: if I send an event to this signal, are effects going to happen?
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Why are you sending events? That should be represented as a stream of inputs.
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When your whole program is a signal network, you don’t think about whether “this specific signal” does stuff.
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