I ended up adding UseCounters and waiting for results to come in. Finally, they did: none of these three methods were used very much, the most frequent (Promise.defer()) occurring in .0015% of document loads. Therefore, I have unshipped them in V8 in https://codereview.chromium.org/1965183002 , which should make it to Canary soon. Please let me know if there is further evidence of breakage, and this can be reconsidered.
On Fri, Dec 11, 2015 at 1:35 PM, Daniel Ehrenberg <[email protected]> wrote: > I think it'll be enough to let this be in Canary at first and see what > bug reports come in. I know there are some usages, but I think > developers will have an easy time converting their code to use 'then' > instead of 'chain'. They have to do so anyway if they want their > websites to work in browsers other than Chrome. It would be a simple > find and replace, or a few lines added to the top of the file to > establish the aliases. The semantics are slightly different, but these > differences should only come up in rare edge cases. > > Dan > > On Fri, Dec 11, 2015 at 1:02 AM, PhistucK <[email protected]> wrote: > > I agree that this is a good change, of course, but you really should find > > out whether this breaks a lot of website first (the fact the developers > do > > not mention this does not mean they are not using it)... > > > > > > ☆PhistucK > > > > On Fri, Dec 11, 2015 at 1:05 AM, Daniel Ehrenberg <[email protected] > > > > wrote: > >> > >> We don't have any use counters, but the names were rather obscure, and > >> the ES2015 Promise conventions seem to have stuck more. I have not > >> heard from any users which were in support of the old Promise API, but > >> on the other hand, the fact that V8 does not currently meet the ES2015 > >> Promise specification is a frequent complaint from both users and > >> frameworks. There is no way to support both ES2015 Promise semantics > >> per spec and Promise.prototype.chain at the same time. > >> > >> Dan > >> > >> On Thu, Dec 10, 2015 at 2:57 PM, PhistucK <[email protected]> wrote: > >> > Are there any use counters for them? Did you check whether they are > used > >> > in > >> > the wild? > >> > (The HTTP archive can help here, or any internal Google index > searching > >> > you > >> > may have) > >> > > >> > > >> > ☆PhistucK > >> > > >> > On Fri, Dec 11, 2015 at 12:50 AM, 'Daniel Ehrenberg' via blink-dev > >> > <[email protected]> wrote: > >> >> > >> >> V8 had added a few functions for manipulating Promises which didn't > >> >> make it into the ES2015 standard, namely Promise.prototype.chain, > >> >> Promise.accept and Promise.defer. ES2015 specifies Promises in a way > >> >> which is incompatible with some of these methods, and none of them > >> >> appear to be on track to be included in a standard the future. > >> >> > >> >> I have added a flag to V8 and Chrome (--js-flags=--promise-extra) to > >> >> retain the current additional promise features. I intend to flip the > >> >> flag off by default in general within a few days, with the aim of V8 > >> >> version 4.9 branching without additional Promise functions. > >> >> > >> >> Dan > >> >> > >> >> -- > >> >> You received this message because you are subscribed to the Google > >> >> Groups > >> >> "blink-dev" group. > >> >> To unsubscribe from this group and stop receiving emails from it, > send > >> >> an > >> >> email to [email protected]. > >> >> > >> > > > > > > -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
