Re: [whatwg/dom] Improving ergonomics of events with Observable (#544)

Concur with @domenic. There are unquestionably impedance mismatches between EventTarget/Observables and Promises due to the way each schedules notifications respectively. However there are plenty of simple use cases in which adapting ET/Observable to Promises is convenient and safe, and we should enable those. I think the best course of action is to provide methods to allow developers to handle ET concerns prior to adaptation (ie the do method).

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> On Dec 14, 2017, at 8:46 AM, Domenic Denicola <notifications@github.com> wrote:
> 
> Just to reiterate, I don't expect the primary way for people to use observables to subscribe to events to be promises. That is only when you want to convert into a promise-using ecosystem (e.g. service worker's waitUntil). Most of the time you'll just do e.g. element.on("click").subscribe(e => e.preventDefault()).
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