Re: [whatwg/dom] Define a 'CancellationController' and 'CancellationSignal' interface. (#434)

domenic commented on this pull request.



> @@ -1419,6 +1419,103 @@ that gave folks all the wrong ideas. <a>Events</a> do not represent or cause act
 can only be used to influence an ongoing one.
 
 
+<h3 id=controlling-promises>Controlling {{Promise}}s</h3>
+
+Though {{Promise}} objects don't have any built-in cancellation mechanism, many {{Promise}}-vending
+APIs require cancellation semantics. {{PromiseController}} is meant to support these requirements by
+providing an {{PromiseController/abort()}} method that toggles the state of a corresponding
+{{PromiseSignal}} object. The API which wishes to support cancellation can accept such a
+{{PromiseSignal}}, and use its state to determine how (not) to proceed.
+
+Upon {{PromiseController/abort()}}, the relevant {{Promise}} will reject with an
+<dfn exception>AbortError</dfn> [=simple exception=].

But also I'm not sure if avoiding DOMException is worthwhile since we already have a dependency on EventTarget.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/dom/pull/434#discussion_r110177874