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Agenda for the 67th meeting of Ecma TC39

  • Host: Apple Inc., Cupertino, CA
  • Dates: 27-29 November 2018
  • Times:
    • 10:00 to 17:00 PST on 27 and 28 of November 2018
    • 10:00 to 16:00 PST on 29 of November 2018
  • Location: Apple Park, Cupertino, CA 95014
  • Contact:
    • Name: Michael Saboff
  • Newcomers Event:
    • Tuesday, November 27, 18:00
    • Location: In Meeting Room
  • Dinner:
    • Wednesday, November 28, 18:30
    • Location: Tied House Brewery & Cafe map
      954 Villa Street
      Mountain View, CA 94041
      (650) 965-2739
  • Audio / Video Conferencing:
    • Via WebEx. Use WebEx or Jabber to connect.
    • Details on the reflector.


  • Parking:

    • 10600 North Tantau Avenue, Cupertino, CA 95014
  • How to access the meeting: You need to come to the Apple Park Reception Building on the West side of the North Tantau Ave / Pruneridge Ave intersection. This is on the opposite side of the campus from the employee Wolfe Road entrance. Note that this is not the Apple Park Visitor's center, the two story building on the East side of North Tantau Ave.

  • Any other logistics required to participate in the meeting

    • Please register ahead of time for the meeting via the Doodle so that your named badge is ready when you arrive.
    • Arrive at least 20 minutes early. This will provide time to walk across the street from the park garage, get your badge at the reception lobby and walk to the meeting room which is some distance away.

Allen's paper on standards committee participation for new attendees:




(I don't have any experience with these hotels. They are the nearest.)

Agenda topic rules

Deadline for advancement eligibility: November 17, 2018, 18:00 UTC

  • 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.
  2. Proposals looking to advance to stage 0 or 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 should include supporting materials when possible.
  3. 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.
  4. 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

    1. Opening of the meeting (Mr. Jaeschke)
    2. TC39 follows its Code of Conduct
    3. Introduction of attendees
    4. Host facilities, local logistics
    5. Quick recap of meeting IPR policy (Daniel Ehrenberg)
    6. Overview of communication tools (Brian Terlson)
  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. Report from the Ecma Secretariat (15m, Istvan Sebestyen)

  7. Project Editors’ Reports

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

  9. Ad-hoc TC39 History Group - Archival data and you! (<10 mins, Jory Burson)

  10. Ecma Fellows nominations (5m)

  11. Web compatibility issues / Needs Consensus PRs

    timebox topic presenter
    10m Modules layering/naming for WebAssembly, for "consensus, ready to merge" (PR #1311, PR #1312) Daniel Ehrenberg (author: Lin Clark)
    10m Dynamic modules layering change, for "consensus, awaiting implementation/embedder feedback" (PR #1306; slides). To be scheduled before 12pm. author: Guy Bedford
    30m Intuition gathering for memory model bug (#1354) Shu-yu Guo
    15m isRegExp change (PR #1318) Jordan Harband
  12. Overflow from previous meeting

    timebox topic presenter
  13. Short (≤30m) Timeboxed Discussions

    timebox topic presenter
    15m ECMAScript 2020 editor-in-chief selection (issue)
    15m Outreach groups update (slides; repo) Yulia Startsev and Daniel Ehrenberg
    5m Policy update Daniel Ehrenberg
    5m Override mistake fix status update (PR) Daniel Ehrenberg
    1m Meeting planning follow-up (dates/locations; Issue) Daniel Ehrenberg
    15m Array.prototype.sort stability (slides, PR) Mathias Bynens
    5m Management group refresh slides Yulia Startsev
  14. Proposals

    stage timebox topic presenter
    3 10m Symbol description for stage 4 (#1346) Michael Ficarra
    3 30m Function.prototype.toString revision for stage 4 (#697) Michael Ficarra
    2 10m Hashbang grammar for Stage 3 Bradley Farias
    2 30m Intl.NumberFormat Feature Proposal for Stage 3 (Slides) Shane Carr
    2 30m Decorators: Stage 2 status update (Please raise any concerns for advancement to Stage 3) Daniel Ehrenberg
    1 5m Withdrawing Distinguishing Literal Strings Adam Klein
    1 20m Distinguishing templates: PR Phase 1, Spec Phase 2 Daniel Ehrenberg
    1 30m dateStyle/timeStyle for Stage 2 (slides) Daniel Ehrenberg
    1 30m Update on Optional Chaining Optional Chaining (slides) Dustin Savery
    0 30m Asset References for Stage 1 Sebastian Markbage
  15. Longer or open-ended discussions

    timebox topic presenter
    15m Updates on after public release Leo Balter
  16. Overflow from timeboxed agenda items (in insertion order)

    topic presenter
  17. Other business

    1. Thank host
  18. Adjournment

Breakout Sessions (Day 3)

Time A (front room) B (back room) C (air shaft) D (hall couches)
10:00-11:00 Private Symbols JS Explain The Issue Queue Typed Objects
11:00-12:00 Optional Chaining Discussion WeakRef The Issue Queue Dynamic Modules
Lunch Decorators Conflict resolution
13:00-14:00 > :: function calls Standard library
14:00-15:00 Locale Data Jessie Semantics Standard Library Our Reputation
15:00-15:30 How we make decisions Standard Library Our Reputation
15:30-16:00 Report Back Report Back Report Back Report Back

Schedule constraints

Dates and locations of future meetings

Dates Location Host
2019-01-29 to 2019-01-31 Scottsdale, AZ GoDaddy
2019-03-26 to 2019-03-28 New York Google
2019-06-04 to 2019-06-06 Berlin JSConf EU
2019-07-23 to 2019-07-25 Redmond, WA Microsoft
2019-10-01 to 2019-10-03 New York Bloomberg
2019-12-03 to 2019-12-05 San Francisco, CA Salesforce