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I have been waiting for cancellable promises for a while primarily for cancelling long lasting fetch requests which is a very common thing to need.

(Not really sure how to parse non determinism and throwing being related to cancelling promises)

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What's a good existing way to deal with this use-case? Is there a useful library that wraps setTimeout / other logic to determine the quality of a user's internet connection in case of very poor connectivity (2G etc) ?

In react native, NetInfo has an api to detect network changes and I use that to stop all my setIntervals and start again with a different set of args, including wait time before calling again.

The way to handle this case is to use Promise.race with 2 promises. The first promise is your logic. The second promise is rejected after a timeout. For more detail read the section "never calling the callback" from "you don't know js" book on "async" in chapter 3 https://github.com/getify/You-Dont-Know-JS/blob/master/async...

Thanks I'll check it out

But that doesn't actually cancel the request, and thusly the data is downloaded anyway? Or am I missing something?

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