Agenda for the 88th meeting of Ecma TC39

September 24, 2025 · View on GitHub

Agenda for the 88th meeting of Ecma TC39

  • Dates and times:
    • 10:00 to 15:00 PST (America/Los_Angeles) on January 24th, 2022
    • 10:00 to 15:00 PST (America/Los_Angeles) on January 25th, 2022
    • 10:00 to 15:00 PST (America/Los_Angeles) on January 26th, 2022
    • 10:00 to 15:00 PST (America/Los_Angeles) on January 27th, 2022
  • Location: Remote
  • Attendee information: https://github.com/tc39/Reflector/issues/411

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

Temporal.ZonedDateTime.from('2022-01-24T10:00[America/Los_Angeles]')
  .withTimeZone(Temporal.Now.timeZone()) // your time zone
  .toLocaleString();

Background:

Agenda topic rules

Deadline for advancement eligibility: January 14th, 2022 10:00 PST

  • 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 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

  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. TC39 Chair's Election, slides (10m, Yulia Startsev)

  7. Confirmation of new "TC39 Administrator" role (previous description) (10m, Brian Terlson)

  8. Secretary's Report (15m, Istvan Sebestyen)https://github.com/tc39/agendas/blob/HEAD/2022/tc39-2022-05.pdf

  9. Project Editors’ Reports

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

  10. Updates from the CoC Committee (15m)

  11. Web compatibility issues / Needs Consensus PRs

    ✓timeboxtopicpresenter
    20mClose sync iterator when async wrapper closes. (PR, Slides)Mathieu Hofman

  12. Overflow from previous meeting

    ✓timeboxtopicpresenter

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

  14. Short (≤30m) Timeboxed Discussions

    ✓timeboxtopicpresenter
    20mProcess clarification: requirements for changes to Stage 3 proposals (1, 2)Philip Chimento
    30mProcess Document: clarify stage 1 polyfill recommendation (PR)Jordan Harband
    30mTC39 & copyrightYulia Startsev

  15. Proposals

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

    ✓stagetimeboxtopicpresenter
    230mArray.fromAsync (Slides TBD; Specification) for stage 3J. S. Choi
    260mSymbols as WeakMap Keys updates and discuss the usage of registered and well-known keys (Slides)Robin Ricard, Leo Balter
    130mIntl.Segmenter v2 for Stage 2 (Slides, Spec Text)Frank Yung-Fong Tang
    130mClass brand check for Stage 2 (Slides, Spec Text)HE Shi-Jun
    045menum for stage 1 (Slides)Jack Works
    030mReversible string split for Stage 1 (Slides)Luca Casonato

  16. Longer or open-ended discussions

    ✓timeboxtopicpresenter
    45mTaking over maintainership of structured clone round 2 (issue)Shu-yu Guo
    60mpresentation from KAIST research groupKAIST research group & TC39 editor group
    45mLet's talk about test262 maintenance and contributionShu-yu Guo
    60mHolistic discussion of TC39 dataflow proposals (JSC’s diagram; JSC’s article; Tab’s article)J. S. Choi

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

    ✓topicpresenter

  18. Other business

    1. Thank host

  19. Adjournment

Schedule constraints

  • Mathieu Hofman is not available Monday 24th. Any other day and time is fine.
    • Presenting: close async iterator wrapper fix PR
    • Would like to be there for: Symbols as WeakMap key, cloning abstraction for ShadowRealms.
  • Frank Yung-fong Tang is NOT available:
    • Tuesday 25th: NOT available before 2pm
  • Robin Ricard (Symbols as WeakMap Keys) is:
    • not available in "afternoon" slots for all days
    • not available Thursday 27th all day
  • Luca Casonato (Reversible string split) is:
    • not available in "afternoon" slots for all days
  • Michael Ficarra is not available Tuesday/Thursday, but would like to attend the presentation from the KAIST research group
  • Myles C. Maxfield is not available Monday 1pm-3pm (California time) and Tuesday 11am-noon, and would like to attend the Intl.Segmenter v2 topic

Dates and locations of future meetings

DatesLocation
2022-03-28 to 2022-03-31Remote: "NY"
2022-06-06 to 2022-06-09Austin TX, US
2022-07-18 to 2022-07-21Remote: "SF"
2022-09-13 to 2022-09-16Tokyo, Japan