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Agenda for the 91st meeting of Ecma TC39

  • Host: Google
  • Dates and times:
    • 10:00 to 16:00 PDT (America/Los_Angeles) on Tuesday 19 July 2022
    • 10:00 to 16:00 PDT (America/Los_Angeles) on Wednesday 20 July 2022
    • 10:00 to 16:00 PDT (America/Los_Angeles) on Thursday 21 July 2022
  • Location: San Francisco, CA
  • Attendee information: Reflector Post

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

Temporal.ZonedDateTime.from('2022-07-19T10:00[America/Los_Angeles]')
  .withTimeZone(Temporal.Now.timeZone()) // your time zone
  .toLocaleString()

Background:

Agenda topic rules

Deadline for advancement eligibility: July 9th, 10:00 PDT

  • 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
    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 (15m, Istvan Sebestyen) https://github.com/tc39/agendas/blob/HEAD/2022/tc39-2022-031.pptx

    1. ECMA262 Status Updates (slides) (15m)
    2. ECMA402 Status Updates (15m)
    3. ECMA404 Status Updates Slides (15m)
    4. Test262 Status Updates (15m)
  7. Updates from the CoC Committee (15m)

  8. Web compatibility issues / Needs Consensus PRs

    timebox topic presenter
    5m Only coerce once in the BigInt constructor Kevin Gibbons
    15m Allow host exotic objects to reject private fields Kevin Gibbons
    30m Avoid triggering throw in corner case in async generators or Avoid mostly-redundant await in async yield* - slides Kevin Gibbons
    30m Always check regular expression flags by "flags" Richard Gibson
    20m Allow toString of a built-in function to output a computed property name Richard Gibson
    20m Clarify the layering relationship between ECMA-262 and ECMA-402 Richard Gibson
  9. Overflow from previous meeting

    timebox topic presenter
  10. Incubation call chartering (15m on the last day)

  11. Short (≤30m) Timeboxed Discussions

    timebox topic presenter
    10m Stenography support (slides, issue) Daniel Ehrenberg
    15m Intl FallbackSymbol: well-known or not? Jordan Harband
    20m Well-formatted PDF standards for 2022 and beyond (slides new PDFs: ECMA-262 ECMA-402) Allen Wirfs-Brock
  12. Proposals

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

    stage timebox topic presenter
    3 5m Resizable buffer's TypedArray.prototype.transfer detach check fix Shu-yu Guo
    3 15m Hashbang for stage 4 (PR) Jordan Harband
    3 20m Change Array by Copy update issue 95 Ashley Claymore
    3 30m Remove Order Check in NumberFormat v3 and in ECMA402 Intl.DateTimeFormat (slides, PR701, PR100) Frank Yung-Fong Tang (Google)
    3 30m Temporal update and normative PRs (slides) Philip Chimento
    3 30m NumberFormat v3 Stage 3 update Slides Shane F Carr (Google)
    2 15m Duplicate named capturing groups for stage 3 Kevin Gibbons
    2 30m Set methods: how to access properties of the argument (slides) Kevin Gibbons
    2 45m Iterator Helpers update (slides) Michael Ficarra and Kevin Gibbons
    2 45m Record & Tuple Update (slides) (issues) Ashley Claymore, Rick Button, Robin Ricard
    1 30m Double-ended Iterator and Destructuring update (slides) HE Shi-Jun
    1 45m Import Reflection (slides) for stage 2 Guy Bedford & Luca Casonato
    1 90m Compartments as Module Loaders (Slides) Kris Kowal
    0 30m Symbol Predicates for stage 1 or 2 (spec) (slides) Jordan Harband & Robin Ricard
    0 30m Policy Maps & Sets for Stage 1 (slides) J. S. Choi & Hemanth HM
    0 30m Function memoization for Stage 1 (slides) J. S. Choi & Hemanth HM
    0 30m Object.{pick,omit} for Stage 1/2 (slides TDB) Hemanth HM
    0 30m Function.pipe & flow for Stage 1 (slides) J. S. Choi
  13. Longer or open-ended discussions

    timebox topic presenter
  14. Overflow from timeboxed agenda items (in insertion order)

    topic presenter
  15. Breakout topics (if time allows)

    If we have additional time in this meeting, the following are topics for informal, inconclusive discussion, potentially in smaller groups in parallel, with no presenter or presentation, or expectations of preparation before the meeting. Please freely propose additional topics (including past the agenda deadline), and we'll decide which sessions to have at the time, based on interests of delegates.

    topic proposer
    Inclusion Daniel Ehrenberg
    Modules Daniel Ehrenberg
    TC39, Ecma and governance Daniel Ehrenberg
    BigInt Math (see 2022-05 incubator & WH’s implementation of sqrt/cbrt) J. S. Choi
    Pipe operator’s topic tokens J. S. Choi
    Call-this/bind-this’s use cases J. S. Choi
  16. Other business

    1. Thank host
  17. 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.

  • Shu-yu Guo cannot attend on July 20 and would like to be present for Change-Array-by-copy, Import Reflection, Compartments, and R&T updates.
  • Nicolò Ribaudo will only attend on the 19th and 20th, and would like to be present for (in order from the most important to the less important) Compartments, R&T updates, Import Reflection, Change-Array-by-copy.
  • J. S. Choi cannot attend all day on July 19, as well as July 20 before 11 am PDT. They can attend on July 20 after 11 am PDT, as well as all day on July 21.
  • Allen Wirfs-Brock can lead the PDF Specs discussion anytime on the 20th, after 11AM the 19th, or after noon the 21st.
  • Philip Chimento (presenting Temporal) only available after 13:00 on the 20th and 21st. In addition to Temporal, I would prefer to be present for the test262 status update and the PDF discussion.
  • The stenographer will work from 10 AM to noon on July 20th (unless other constraints come up, in which case Daniel Ehrenberg can work with the stenographer to try to reschedule). Ideally, that day would start with a brief stenography presentation, followed by two hours of topics which are happy to have stenographer support.
  • Jack Works: I want to be present for (in order from the most important to the less important) Pattern Matching, Compartments, Import Reflection, ShadowRealm. I'm available on any day, but it is midnight for me. I prefer those topics are continuously presented (no other topics in the middle). I want to request that those topics should not be presented earlier than the scheduled time, otherwise I may miss it.
  • Chengzhong Wu will only be available on first 2 hours and would like to be present for ShadowRealm.

Normal Constraints

Late-breaking Schedule Constraints

Dates and locations of future meetings

Dates Location
2022-09-13 to 2022-09-16 Remote (JST timezone)