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Ecma logo

Agenda for the 114th meeting of Ecma TC39

  • Host: JetBrains
  • Dates and times:
    • 10:00 to 17:00 CEST (Europe/Amsterdam) on 2026-05-19
    • 10:00 to 17:00 CEST (Europe/Amsterdam) on 2026-05-20
    • 10:00 to 16:00 CEST (Europe/Amsterdam) on 2026-05-21
  • Location: Amsterdam, the Netherlands
  • Attendee information: https://github.com/tc39/Reflector/issues/578
  • Total duration of scheduled discussions: dynamically computed total of timeboxes on the agenda
gantt
  1 month before the meeting: milestone, 2026-04-19 10:00+0200, 1m
  Proposal advancement deadline: milestone, 2026-05-09 10:00+0200, 1m
  Schedule constraint deadline: milestone, 2026-05-16 10:00+0200, 1m
  Day 1 : day1, 2026-05-19 10:00+0200, 7h
  Day 2 : day2, 2026-05-20 10:00+0200, 7h
  Day 3 : day3, 2026-05-21 10:00+0200, 6h
  todayMarker stroke-width:5px,stroke:#0f0,opacity:0.5
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For meeting times in your timezone, run the code below in your browser dev tools console.

Temporal.ZonedDateTime.from('2026-05-19T10:00[Europe/Amsterdam]')
  .withTimeZone(Temporal.Now.timeZoneId()) // your time zone
  .toLocaleString();

Background:

Agenda topic rules

Deadline for advancement eligibility: CALCULATE TIME HERE

  • 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, 10m)

    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)

  7. Project Editors’ Reports

    1. ECMA262 Status Updates (5m)
    2. ECMA402 Status Updates (5m)
    3. ECMA404 Status Updates (1m)
    4. Test262 Status Updates (5m)

  8. Task Group Reports

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

  9. Updates from the CoC Committee (1m)

  10. Web compatibility issues / Needs Consensus PRs

    timebox topic presenter
    30m Needs-consensus PR: use Numbers instead of reals as counters in Iterator builtins (#3776, slides) Michael Ficarra

  11. Overflow from previous meeting

    timebox topic presenter

  12. Short (≤30m) Timeboxed Discussions

    timebox topic presenter
    30m Tooling for navigating the ECMA-262 specification and reviewing API proposals Alberto Tontoni, Mikhail Barash

  13. Proposals

    stage timebox topic presenter
    2.7 20m ESM Phase Imports normative PRs (slides to follow, PRs #58 & #61) Guy Bedford
    2.7 30m Iterator Chunking for Stage 3 (#30, tests, slides TBD) Michael Ficarra
    2 15m RegExp Buffer Boundaries for Stage 2.7 or 3 (slides, test262 PR) Ron Buckton

  14. Longer or open-ended discussions

    timebox topic presenter
    60m agreeing to consider impact of RegExp proposals to linear implementations Michael Ficarra, Aurèle Barrière, Clément Pit-Claudel

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

    topic presenter
  1. Other business
    1. Thank host
  2. 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

  • Guy Bedford: Available from 3pm only.
  • Mikhail Barash, Alberto Tontoni: we would like the topic on Tooling for Navigating the Spec to be scheduled at 14:00 CET on either 20th or 21st May, so that the JetBrains MPS team can attend.

Late-breaking Schedule Constraints