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Ecma logo

Agenda for the 96th meeting of Ecma TC39

  • Host: Remote
  • Dates and times:
    • 10:00 to 15:00 TZ (America/Chicago) on 15 May 2023
    • 10:00 to 15:00 TZ (America/Chicago) on 16 May 2023
    • 10:00 to 15:00 TZ (America/Chicago) on 17 May 2023
    • 10:00 to 15:00 TZ (America/Chicago) on 18 May 2023
  • Attendee information: https://github.com/tc39/Reflector/issues/470

For meeting times in your timezone, visit Temporal docs and run the code below in the devtools console.

Temporal.ZonedDateTime.from('2023-05-15T10:00[America/Chicago]')
  .withTimeZone(Temporal.Now.timeZoneId()) // your time zone
  .toLocaleString()

Background:

Agenda topic rules

Deadline for advancement eligibility: May 5th, 10:00 CT

  • Note: this time is selected to be precisely 10 days prior to the start of the meeting
  1. Proposals not looking to advance may be added at any time; if after the deadline, please always use a pull request so that members are notified of changes. Note: an unmerged PR counts as ”added” for the purposes of this requirement.
  2. Proposals seeking feedback at stage 0 must be added (and noted as such) prior to the deadline, or else delegates may object to advancement solely on the basis of missing the deadline.
    1. Such proposals should include supporting materials when possible.
  3. Proposals looking to advance to stage 1 must be added (and noted as such) prior to the deadline, or else delegates may object to advancement solely on the basis of missing the deadline.
    1. Such proposals must link to a proposal repository and they should link to supporting materials when possible.
  4. Proposals looking to advance to stages 2, 3, or 4 must be added (and noted as such) along with the necessary materials prior to the deadline, or else delegates may object to advancement solely on the basis of missing the deadline.
    1. Such proposals must link to supporting materials prior to the deadline, or else delegates may object to advancement solely on the basis of missing the deadline. If these materials change substantially after the deadline, the proposal may be disqualified from advancement, based on the committee’s judgment.
    2. Proposals looking to advance to stage 4 must link to a pull request into the spec, since the process requires one.
  5. Proposal-based agenda items should be sorted primarily by stage (descending), secondarily by timebox (ascending), and finally by insertion date.

Supporting materials includes slides, a link to the proposal repository, a link to spec text, etc.; essentially, anything you are planning to present to the committee, or that would be useful for delegates to review.

Agenda key

When applicable, use these emoji as a prefix to the agenda item topic.

Emoji Meaning
🔒 schedule constraints apply to this agenda item
⌛️ late addition for stage advancement and/or schedule prioritization
🔁 continuation of a previous agenda item

Agenda items

  1. Opening, welcome and roll call (Chair)

    1. Opening of the meeting
    2. TC39 follows its Code of Conduct
    3. Introduction of attendees
    4. Host facilities, local logistics
    5. Quick recap of meeting IPR policy
    6. Overview of communication tools
    7. Reminder to review Github Delegate teams (Jordan Harband)

  2. Find volunteers for note taking

  3. Adoption of the agenda

  4. Approval of the minutes from last meeting

  5. Next meeting host and logistics

  6. Secretary's Report (20-25m, Istvan Sebestyen (https://github.com/tc39/agendas/blob/main/2023/tc39-2023-025.pdf) and Samina Husain)

  7. Project Editors’ Reports

    1. ECMA262 Status Updates (15m)
    2. ECMA402 Status Updates (15m)
    3. ECMA404 Status Updates (15m)
    4. Test262 Status Updates (15m)

  8. Updates from the CoC Committee (15m)

  9. Vote to approve ES2023 for submission to Ecma GA (5m, TC39 Chairs)

  10. Web compatibility issues / Needs Consensus PRs

    ✓ timebox topic presenter
    8m needs consensus: #3052 limit ArrayBuffer size to 253 bytes (slides) Michael Ficarra

  11. Overflow from previous meeting

    ✓ timebox topic presenter

  12. Incubation call chartering (15m on the last day)

  13. Short (≤30m) Timeboxed Discussions

    ✓ timebox topic presenter
    10m TC39 Public Calendar Chris de Almeida
    10m TG3 Status (impromptu discussion) Chris de Almeida
    5m Incubator Chartering: Call for helpers Shu-yu Guo

  14. Proposals

    ✓ represents an agenda item which has been presented, and does not indicate stage advancement

    ✓ stage timebox topic presenter
    3 10m Well-Formed Unicode Strings (String.prototype.{is,to}WellFormed) for stage 4 (slides, PR) Michael Ficarra
    3 15m Array.fromAsync #41: avoid double construction of this value (slides) Michael Ficarra, J. S. Choi
    3 15m Atomics.waitAsync for Stage 4 (PR) Shu-yu Guo
    3 15m 🔒 RegExp v flag for Stage 4 (PR, slides) Mathias Bynens, Markus Scherer
    3 20m Temporal updates (slides) Philip Chimento
    3 30m iterator helpers: should Symbol.iterator fallback be a callable check or an undefined/null check? (slides) Michael Ficarra
    3 30m Array.prototype.group rename for web compatibility (slides) Daniel Ehrenberg
    3 40m iterator helpers: should malformed iterators fail early or fail only when iterated? (slides) Michael Ficarra
    3 40m Decorator field/accessor initializer order (issue, slides) Kristen Hewell Garrett
    3 45m Intl.DurationFormat Stage 3 Update (slides) Ujjwal Sharma
    2 15m Symbol Predicates needs stage 3 reviewers; confirm semantics Jordan Harband
    2 30m Decorator Metadata for Stage 3 (slides, spec text) Kristen Hewell Garrett
    2 45m Float16Array for stage 3 (slides, spec) Kevin Gibbons
    2 45m 🔒 Source Phase Imports for stage 3 (slides, spec) Luca Casonato & Guy Bedford
    2 45m ⌛️ Async iterator stage 2 feedback needed on design/tradeoffs (slides) Kevin Gibbons
    2 45m Async Context Stage 2 Updates (slides) Chengzhong Wu, Justin Ridgewell
    1 30m Base64 for Uint8Array for stage 2 (slides, spec) Kevin Gibbons
    1 30m Time Zone Canonicalization for stage 2 (slides, spec) Justin Grant, Richard Gibson
    1 30m Promise.withResolvers for stage 2 (repo, slides) Peter Klecha
    0 30m Intl ZonedDateTimeFormat for stage 1 (slides, repo) Frank Yung-Fong Tang

  15. Longer or open-ended discussions

    ✓ timebox topic presenter
    30m Source maps: Should TC39 standardize and improve them? (slides, current "spec", development repository) Daniel Ehrenberg
    60m Module Harmony: interaction semantics of the different proposals (slides) Nicolò Ribaudo
    30m Process: Add Implementation Status to Proposal Pages for approval (slides) Michael Saboff

  16. Overflow from timeboxed agenda items (in insertion order)

    ✓ topic presenter

  17. Other business

    1. Thank host

  18. Adjournment

Schedule constraints

Schedule constraints should be supplied here 48 hours before the meeting begins so that the Chairs can take them into account when preparing the schedule.

Normal Constraints

  • Mark S. Miller (MM, Agoric) will be absent Thursday, May 18.
  • Kris Kowal (KKL, Agoric) will be absent Thursday, May 18 and would like to be present for Source Phase Imports and any other Module Harmony topics.
  • Markus Scherer, Mark Davis, Shane Carr, and Mathias Bynens would like to be present for the RegExp v flag agenda item, and are available on May 16th from 10:00 until 11:30 TZ (America/Chicago).
  • Nicolò Ribaudo is only available on Monday and Wednesday (but Monday is better), and would like to be present for all the topics related to modules.
  • Luca Casonato is only available on Monday and Wednesday (but Monday is better), and would like to be present for all the topics related to modules.
  • J. S. Choi (JSC, Indiana University) will be absent on Tuesday, May 16 (all day), Wednesday, May 17 (starting at 2 pm America/Chicago), and Thursday, May 18 (all day).
  • Ron Buckton (RBN, Microsoft) will be absent the afternoon of Tuesday, May 16 (starting at 2pm [America/Chicago]) and would like to be present for Decorator Metadata and Decorator field/accessor initializer order.
  • Michael Saboff (MLS, Apple) will be absent the morning of Monday, May 15 and would like to be present for the RegExp v flag agenda item.
  • The Module Harmony interaction semantics presentation should precede the Source Phase Imports presentation.
  • Kristen Hewell Garrett (KHG, Bitski) will be absent Thursday, May 18th and would like to present Decorator Metadata for Stage 3 and Decorator field/accessor initializer order
  • Chengzhong Wu (CZW, Alibaba) is attending from Hangzhou, preference for the Async Contexts topic being discussed at the first two hours of the meeting, any of the days.
  • Frank Yung-Fong Tang (FYT) can only present on the morning of Wednesday, May 17.
  • Jesse Alama (JMN) can present only on Thursday, May 18.
  • Jordan Harband will be absent the first hour on Tuesday and Thursday mornings, and would like to be present for Symbol Predicates (presenter), Iterator Helpers, Array group, Decorator Metadata, Promise withResolvers, Source Phase Imports, and Decorator field/accessor initializer order
  • Justin Grant can attend any time except: Tue May 16 1-3, Wed May 17 10:30-11:45, and Thu May 18 1:30-3. I'm presenting the Time Zone Canonicalization proposal so I must attend that one, ideally after 12:00 but I can be flexible. I'd also like to attend the Temporal Update, Intl.ZonedDateTimeFormat, and Source Maps presentations.

Late-breaking Schedule Constraints

Dates and locations of future meetings

Dates Location Host
2023-07-11 to 2023-07-13 Bergen, Norway University of Bergen
2023-09-26 to 2023-09-28 Tokyo, Japan Bloomberg
2023-11-27 to 2023-11-30 Remote: "SF"