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Ecma logo

Agenda for the 107th meeting of Ecma TC39

  • Host: Remote
  • Dates and times:
    • 10:00 to 15:00 EDT (America/New_York) on 14 April 2025
    • 10:00 to 15:00 EDT (America/New_York) on 15 April 2025
    • 10:00 to 15:00 EDT (America/New_York) on 16 April 2025
    • 10:00 to 15:00 EDT (America/New_York) on 17 April 2025
  • Location: Remote
  • Attendee information: https://github.com/tc39/Reflector/issues/554
  • Total duration of scheduled discussions: dynamically computed total of timeboxes on the agenda
gantt
  1 month before the meeting: milestone, 2025-03-14 10:00-0500, 1m
  Proposal advancement deadline: milestone, 2025-04-04 10:00-0500, 1m
  Schedule constraint deadline: milestone, 2025-04-11 10:00-0500, 1m
  Day 1 : day1, 2025-04-14 10:00+0000, 7h
  Day 2 : day2, 2025-04-15 10:00+0000, 7h
  Day 3 : day3, 2025-04-16 10:00+0000, 7h
  Day 4 : day4, 2025-04-17 10:00+0000, 7h
  todayMarker stroke-width:5px,stroke:#0f0,opacity:0.5
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For meeting times in your timezone, visit Temporal docs and run the code below in the devtools console.

Temporal.ZonedDateTime.from('2025-04-14T10:00[America/New_York]')
  .withTimeZone(Temporal.Now.timeZoneId()) // your time zone
  .toLocaleString()

Background:

Agenda topic rules

Deadline for advancement eligibility: April 4th, 10:00 EDT

  • 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, 2.7, 3, or 4, as well as other normative changes to the standard or proposals in stage 3 or later looking to achieve consensus, must be added (and noted as such) along with links to the supporting materials prior to the deadline, or else delegates may withhold consensus for advancement solely on the basis of missing the deadline.
    1. If the supporting materials change substantially after the deadline, delegates may withhold consensus for advancement, based on the committee’s judgment.
    2. For urgent normative changes, the committee is expected to be more forgiving of a missed deadline, since there is generally less material to review than in a stage advancement.
    3. 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
❄️ hard schedule constraints apply to this agenda item (e.g. presenter)
🔒 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)
    8. TC39 stenography support and legal disclaimer

  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, Samina Husain) (slides)

  7. Project Editors’ Reports

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

  8. Task Group Reports

    1. TG3: Security (5m)
    2. TG4: Source Maps (slides) (5m)
    3. TG5: Experiments in Programming Language Standardization (5m)

  9. Updates from the CoC Committee (5m)

  10. Web compatibility issues / Needs Consensus PRs

    timebox topic presenter
    5m Normative: add notation to PluralRules (ecma402#989, slides) Ujjwal Sharma
    10m Normative: Mark sync module evaluation promise as handled (#3535, slides) Nicolò Ribaudo

  11. Overflow from previous meeting

    timebox topic presenter

  12. Short (≤30m) Timeboxed Discussions

    timebox topic presenter

  13. Proposals

    stage timebox topic presenter
    3 5m Note about changed behavior of Array.fromAsync after landing #2600 Kevin Gibbons
    3 10m Temporal status update (slides) Philip Chimento
    3 30m Explicit Resource Management implementer feedback (slides) Daniel Minor
    2.7 30m Immutable ArrayBuffer for stage 3 (keynote slides, pdf slides, incomplete video) Mark Miller, Peter Hoddie
    2 15m ⌛️ Withdrawing Record & Tuples (slides) Ashley Claymore
    2 30m Upsert for stage 2.7 (slides) Daniel Minor
    2 30m Intl Era Month Code Stage 2 Update (Slides) Shane F Carr
    2 45m AsyncContext Stage 2 Update (slides) Andreu Botella, Chengzhong Wu, Nicolò Ribaudo
    1 60m Don't Remember Panicking stage 1 Update (keynote slides, pdf slides, video) Mark Miller, Peter Hoddie
    1 60m Stage 1 update for decimal & measure: Amounts (slides) Jesse Alama
    0 30m Non-extensible Applies to Private for stage 1, 2, or 2.7 (keynote slides, pdf slides, video) Mark Miller, Shu-yu Guo
    0 30m Compare Strings by Codepoint for stage 1 (docs slides, pdf slides) Mathieu Hofman, Mark Miller
    0 30m Object.propertyCount for stage 1 or 2 Jordan Harband
    0 / 2 30m export defer extracted from import defer: stage 2 update or for stage 1 (slides) Nicolò Ribaudo
    0 60m Composite Keys for stage 1 (repo, slides) Ashley Claymore
    0 60m Enums for Stage 1 (explainer, slides) Ron Buckton
    0 60m Disposable AsyncContext for Stage 1 (slides) Chengzhong Wu, Luca Casonato, snek
    N/A 30m WHATWG Observables for general TC39 feedback (slides) Dominic Farolino

  14. Longer or open-ended discussions

    timebox topic presenter
    30m Guidelines for Locale-Sensitive Testing in Test262 (slides) Philip Chimento
    60m Update to Consensus policy (slides) Michael Saboff

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

    topic presenter

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

  17. Other business

    1. Thank host

  18. Adjournment

Schedule constraints

Schedule constraints should be supplied here as soon as possible, and at least three days before the meeting begins so that the Chairs can take them into account when preparing the schedule.

Normal Constraints

  • Jordan Harband will not be present for the first 2 hours of each day, and the last hour of days 1, 3, and 4, and would like to be present for the following items: Consensus, Object.propertyCount, Non-extensibile Applies to Private, Compare Strings By Codepoint, Composite Keys, Upsert, Enums, Immutable ArrayBuffer, export defer
  • Nicolò Ribaudo will not be available on the second day. Other than for my presentations, I'd like to be present (in order of priority, Decimal is the only one I strongly care about) for Decimal, AsyncContext (both presentations) Composite keys, enums.
  • Luca Casonato will not be available on the second day. I need to be present for Disposable AsyncContext.Variable, and would like to be present for composite keys.
  • Steve Hicks will not be available after 11am on day 4, and I'd like to participate in the two AsyncContext discussions.
  • Ron Buckton will not be available after 2:30pm on days 1 and 2 and needs to be present for "Explicit Resource Management implementer feedback" and "Disposable AsyncContext" in addition to his own topic.
  • Philip Chimento: Feel free to deprioritize "Guidelines for Locale-Sensitive Testing in Test262" if time is short.
  • Shane F Carr would like to attend the following topics: Intl Era Month Code (required), Decimal (required), Compare Strings by Codepoint (required), Guidelines for Locale-Sensitive Testing in Test262 (required), Composite Keys (optional). He is not available at the following times (all in EDT): Monday after 12pm (other meetings); Tuesday (traveling); Thursday after 11:30am (commute and other meetings).
  • The AsyncContext stage 2 presentation should be before the Disposable AsyncContext one, not necessarily back-to-back.
  • 'Withdrawing Records & Tuples' should be after 'Composite Keys for Stage 1'
  • ❄️ Dominic Farolino can present Observables on any of the following: Tuesday, 10:00–13:00 EDT; Wednesday, 10:00–12:00 EDT; Thursday, 10:00–13:00 EDT.

Late-breaking Schedule Constraints

  • Philip Chimento: I will not be available for the last 30 minutes of Wednesday 16 April.
  • Aki Rose Braun: I will be unavailable the last hour of Monday and the second half of Wednesday. I have a strong preference to be present for the Consensus discussion.