2057270 - Ship await dictionary proposal

Status: RESOLVED FIXED

(Core :: JavaScript Engine, task, P3)

Description

[Dan Minor [:dminor]]

This proposal recently reached Stage 3 at the July 2026 TC39 plenary, so we can look into shipping it, probably in Firefox 155 or 156.

Comment 1

[Cornelius | CE student]

Attachment: Bug 2057270 - Clarify working directory for test262-update.py in js/src/tests/README.txt r=dminor

test262-update.py must be run from js/src/tests/, but the preceding
section header (js/src/tests/test262/ contains a snapshot...) reads as
though the commands should be run from inside test262/ itself. Make
the working directory explicit in step 2 to avoid that confusion.

Comment 2

[Cornelius | CE student]

Attachment: Bug 2057270 - Update test262 snapshot r=dminor

Update the vendored test262 snapshot to the latest upstream revision.

Skips built-ins/AsyncIteratorPrototype/Symbol.asyncDispose/invokes-return.js
under --enable-explicit-resource-management pending bug 2058720.

Comment 3

[Cornelius | CE student]

Attachment: Bug 2057270 - Ship Promise.allKeyed and Promise.allSettledKeyed. r=arai,dminor

Comment 4

[Dan Minor [:dminor]]

Attachment: Bug 2057270 - Update test_xrayToJS for Promise.allKeyed and allSettledKeyed; r=nika!

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/edd301e281f6
https://hg.mozilla.org/integration/autoland/rev/33b0994487af
Clarify working directory for test262-update.py in js/src/tests/README.txt r=dminor
https://github.com/mozilla-firefox/firefox/commit/3c3726ef6f7d
https://hg.mozilla.org/integration/autoland/rev/caa73a950353
Update test262 snapshot r=dminor
https://github.com/mozilla-firefox/firefox/commit/e51bf69476aa
https://hg.mozilla.org/integration/autoland/rev/9ecda89e497b
Ship Promise.allKeyed and Promise.allSettledKeyed. r=arai,dminor
https://github.com/mozilla-firefox/firefox/commit/5b3ae8a49df2
https://hg.mozilla.org/integration/autoland/rev/176605ed3220
Update test_xrayToJS for Promise.allKeyed and allSettledKeyed; r=nika

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/01e1465e6099
https://hg.mozilla.org/integration/autoland/rev/6bdca627daac
Revert "Bug 2057270 - Update test_xrayToJS for Promise.allKeyed and allSettledKeyed; r=nika" for causing reftest failures @ allKeyed.js

Comment 7

[amarc]

Backed out for causing reftest failures

• Backout link
• Push with failures
• Failure Log

Comment 8

[Dan Minor [:dminor]]

Attachment: Bug 2057270 - Update Promise.allKeyed non262 tests skip condition; r=arai!

Comment 9

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/ae1e679a42ae
https://hg.mozilla.org/integration/autoland/rev/dbb1d4dc3559
Clarify working directory for test262-update.py in js/src/tests/README.txt r=dminor
https://github.com/mozilla-firefox/firefox/commit/de716cc105ea
https://hg.mozilla.org/integration/autoland/rev/fa53cd200818
Update test262 snapshot r=dminor
https://github.com/mozilla-firefox/firefox/commit/21cbe7020e51
https://hg.mozilla.org/integration/autoland/rev/aefb725d0eb9
Ship Promise.allKeyed and Promise.allSettledKeyed. r=arai,dminor
https://github.com/mozilla-firefox/firefox/commit/1f5eb454dfe4
https://hg.mozilla.org/integration/autoland/rev/74561f34b2a3
Update test_xrayToJS for Promise.allKeyed and allSettledKeyed; r=nika
https://github.com/mozilla-firefox/firefox/commit/008822765dd8
https://hg.mozilla.org/integration/autoland/rev/24319b02ba78
Update Promise.allKeyed non262 tests skip condition; r=arai

Comment 10

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/dbb1d4dc3559
https://hg.mozilla.org/mozilla-central/rev/fa53cd200818
https://hg.mozilla.org/mozilla-central/rev/aefb725d0eb9
https://hg.mozilla.org/mozilla-central/rev/74561f34b2a3
https://hg.mozilla.org/mozilla-central/rev/24319b02ba78

Comment 11

[Ryan VanderMeulen [:RyanVM]]

Did you want to nominate this for the Fx155 relnotes? If so, set the relnote-firefox flag to "?"
https://wiki.mozilla.org/Release_Management/Release_Notes_Nomination

Possible wording:

Firefox now supports the Promise.allKeyed and Promise.allSettledKeyed methods, which take an object of promises and resolve to an object of results with the same keys.

Comment 12

[Dan Minor [:dminor]]

Release Note Request (optional, but appreciated)
[Why is this notable]: Ships Promise.allKeyed and Promise.allSettledKeyed
[Affects Firefox for Android]: Yes
[Suggested wording]: See comment#11
[Links (documentation, blog post, etc)]: https://github.com/tc39/proposal-await-dictionary

Comment 13

[Ryan VanderMeulen [:RyanVM]]

Added to the Fx155 relnotes.

Comment 14

[Hamish Willee]

FF155 MDN docs work for this can be tracked in https://github.com/mdn/content/issues/45186