On 1/10/17 2:54 PM, Michał Wadas wrote:
Internal slots correspond to internal state that is associated with
objects and used by various ECMAScript specification algorithms.
*Internal slots are not object properties* and they are not inherited.
OK, so having an internal slot for the value of .st
> On Jan 10, 2017, at 9:57 AM, Boris Zbarsky wrote:
>
> On 1/10/17 1:56 AM, Raul-Sebastian Mihăilă wrote:
>> Even if the `stack` property is non-standard, getting its property
>> descriptor must follow the same general rules for ordinary objects.
>
> Not if its (non-standard) implementation mak
V8 have bug.
Reproduction code:
Error.prepareStackTrace = ()=>{throw 123}
Object.getOwnPropertyDescriptor(new Error, 'stack') // throws 123
It should be probably filled on V8 bug tracker.
On 10/01/17 21:14, Isiah Meadows wrote:
>
> To clarify, what engine has the bug here? I've lost that contex
To clarify, what engine has the bug here? I've lost that context.
On Tue, Jan 10, 2017, 14:54 Michał Wadas wrote:
> Actually here spec repeats itself because...
>
> *A conforming implementation of ECMAScript may provide additional* types,
> values, objects, *properties*, and functions beyond tho
Actually here spec repeats itself because...
*A conforming implementation of ECMAScript may provide additional*
types, values, objects, *properties*, and functions beyond those
described in this specification. *In particular, a conforming
implementation of ECMAScript may provide properties not des
Implementations are allowed to extend objects. Otherwise presence of
global/console/// would violate spec...
On 10/01/17 20:21, Boris Zbarsky wrote:
> On 1/10/17 2:10 PM, Raul-Sebastian Mihăilă wrote:
>> Do you mean that an implementation is allowed to return an exotic object
>> from the Error co
On 1/10/17 2:31 PM, Michał Wadas wrote:
Implementations are allowed to extend objects. Otherwise presence of
global/console/// would violate spec...
http://www.ecma-international.org/ecma-262/6.0/#sec-global-object
explicitly says that the global object may have additional properties,
so glob
I disagree regarding the conformance. According to the conformance section (
https://tc39.github.io/ecma262/#sec-conformance):
A conforming implementation of ECMAScript may provide additional types,
values, objects, properties, and functions beyond those described in this
specification. In particu
On 1/10/17 2:10 PM, Raul-Sebastian Mihăilă wrote:
Do you mean that an implementation is allowed to return an exotic object
from the Error constructor?
No, I'm saying some implementations do that, because they want to
implement a non-standard "stack" property and the only way to get
reasonable
Do you mean that an implementation is allowed to return an exotic object
from the Error constructor?
https://tc39.github.io/ecma262/#sec-error-message
The Error constructor calls OrdinaryCreateFromConstructor in step 2.
https://tc39.github.io/ecma262/#sec-ordinarycreatefromconstructor
According
On 1/10/17 1:56 AM, Raul-Sebastian Mihăilă wrote:
Even if the `stack` property is non-standard, getting its property
descriptor must follow the same general rules for ordinary objects.
Not if its (non-standard) implementation makes the object itself
non-ordinary (again, non-standard)...
-Bor
Check on practice hove [bluebirdjs-cancellation](
http://bluebirdjs.com/docs/api/cancellation.html) works and find out that
[promise-executor](
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise#Parameters).``onCancel``
callback get executed before finally blocks
> Um... This isn't much different than Bluebird's
`Promise.prototype.cancel`,
> admittedly the least optimal of all these so far.
Yes, very similar, in that it is propagated upward on "async-stacktrace",
and can be actually handled in [promise-executor](
https://developer.mozilla.org/en/docs/Web/J
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