899557 - Implement ProgressPromise

Status: RESOLVED WONTFIX

(Core :: DOM: Core & HTML, defect, P5)

Description

[Jonathan Watt [:jwatt]]

I need this for bug 894840.

https://github.com/slightlyoff/Promises/blob/master/ProgressFuture.idl

Comment 1

[David Bruant]

Let's call that a Stream?

(In reply to Jonathan Watt [:jwatt] from comment #0)
> https://github.com/slightlyoff/Promises/blob/master/ProgressFuture.idl
No commit for the last 3 months and that's not part of the promise spec. I wouldn't count on the maturity of this tentative spec nor in the design.

Comment 2

[Anne (:annevk)]

I plan on adding it. I discussed it a bit with Mark around the TC39 meeting. We'll have to figure it out.

A ProgressPromise represents progress of a single value. An object stream represents a stream of values. The differences is that with the former you can ignore the progress reports, but with the latter the individual bits are important.

Comment 3

[Jonas Sicking (:sicking) No longer reading bugmail consistently]

I think we should prototype this as

callback VoidAnyCallback = void (optional any value);
interface ProgressPromise : Promise {
  ProgressPromise progress(VoidAnyCallback callback);
}

The function always returns 'this'. I.e. it returns the same object it was called on. It'll call its callback with API-specific progress information (just like a Promise returns an API-specific result).

For now we should pref this such that it's only released on nightly and aurora though.

Comment 4

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046

Move all DOM bugs that haven’t been updated in more than 3 years and has no one currently assigned to P5.

If you have questions, please contact :mdaly.

Comment 5

[Sylvestre Ledru [:Sylvestre]]

No assignee, updating the status.

Comment 6

[Anne (:annevk)]

Thanks for the nudge, this is WONTFIX now. I don't expect it to make a comeback, but specific APIs, such as fetch(), might offer ways to observe progress going forward: https://github.com/whatwg/fetch/issues/607.