Agenda for the 80th meeting of Ecma TC39

Host: Netflix
Dates and times:
- 10:00 to 15:00 PST (UTC -8) on January 25th, 2021
- 10:00 to 15:00 PST (UTC -8) on January 26th, 2021
- 10:00 to 15:00 PST (UTC -8) on January 27th, 2021
- 10:00 to 15:00 PST (UTC -8) on January 28th, 2021
Location: Remote (was Los Angeles)
Attendee information: https://github.com/tc39/Reflector/issues/340

Background:

Allen Wirfs-Brock's paper on standards committee participation for new attendees
TC39's documentation on How to participate in meetings

Agenda topic rules

Deadline for advancement eligibility: January 15th, 2021, 10:00 PST

_{Note: this time is selected to be precisely 10 days prior to the start of the meeting}

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.
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.
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.
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.
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

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
Find volunteers for note taking
Adoption of the agenda
Approval of the minutes from last meeting
Next meeting host and logistics
Secretary's Report (15m, Istvan Sebestyen, https://github.com/tc39/agendas/blob/HEAD/2021/tc39-2021-004-January-meeting-Secretariat-Report.pdf)
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)
Updates from the CoC Committee (15m)
Confirmation of 2021 Chair Group (5m)
Web compatibility issues / Needs Consensus PRs

✓ timebox topic presenter

15m Runtime Semantics for MemberExpression do not conform to web reality (issue, PR) Yulia Startsev & Jason Orendorff
Overflow from previous meeting

✓ timebox topic presenter
Incubation call chartering (15m on the last day)
Short (≤30m) Timeboxed Discussions

✓ timebox topic presenter

Proposals

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

stage	timebox	topic	presenter
3	10m	⌛️ Relative indexing method for stage 4 (Late addition, deprioritize) (slides)	Shu-yu Guo
3	30m	RegExp Match Indices update (spec, slides)	Ron Buckton
3	30m	`Intl.DateTimeFormat.prototype.formatRange` for Stage 4 (spec, PR, slides)	Felipe Balbontín
2	20m	JSON modules for stage 3 (slides)	Myles Borins, Daniel Ehrenberg, Sven Sauleau, Daniel Clark
2	30m	Array.isTemplateObject for stage 3 (slides)	Krzysztof Kotowicz
2	30m	Temporal updates (slides)	Ujjwal Sharma
2	30m	Class `static` Initialization Blocks for Stage 3 (tentatively) (spec, slides)	Ron Buckton
2	30m	ResizableArrayBuffer and GrowableSharedArrayBuffer updates (slides)	Shu-yu Guo
2	60m	Realms updates (slides tbd)	Leo Balter, Caridy Patiño
2	60m	Ergonomic brand checks for private fields for stage 3 (issue)	Jordan Harband
1	30m	Intl Locale Info for stage 2	Frank Yung-Fong Tang
1	30m	Intl DisplayNames v2 for stage 2	Frank Yung-Fong Tang
1	30m	Dynamic code brand checks for stage 2 (slides)	Krzysztof Kotowicz
1	30m	JS Module Blocks for stage 2 (spec, slides)	Surma
1	30m	`do` expressions for stage 2 (slides, spec)	Kevin Gibbons
0	20m	Array find from last for stage 1 (slides)	Wenlu Wang
0	20m	Extend TimeZoneName Option Proposal for stage 1	Frank Yung-Fong Tang
0	20m	eraDisplay option for Intl.DateTimeFormat for stage 1 (slides)	Shane F. Carr
0	20m	Adopting Unicode behavior for set notation in regular expressions (slides) for stage 1	Markus Scherer, Mathias Bynens
0	20m	Intl LocaleMatcher for Stage 1	Long Ho
0	20m	`async do` expressions for stage 1 (slides, spec)	Kevin Gibbons
0	30m	index from end syntax for stage 1 (slides)	HE Shi-Jun
0	45m	class brand check for stage 1 (slides)	HE Shi-Jun
0	30m	defer module import eval for stage 1 (slides)	Yulia Startsev

Longer or open-ended discussions

timebox	topic	presenter
15m	Inclusion WG updates and Matrix proposal	Mark Cohen [+]
30m	Brand checking (discussion, slides)	Daniel Ehrenberg
30m	Revisiting `RegExp.escape`	Jordan Harband
30m	The nature of protocols in JavaScript (issue, slides) (late addition)	Daniel Ehrenberg
45m	Spec complexity and planning for future implementations (slides, discussion)	Shane F. Carr, Zibi Braniecki
60m	Chartering a Security TG (Reflector thread) (slides)	Michael Ficarra

Overflow from timeboxed agenda items (in insertion order)

✓ topic presenter

Realms updates, remaining queue items (includes identity discontinuity) Caridy Patiño, Shu-yu Guo, Leo Balter
Incubation call chartering (15m on the last day)
Other business
1. Thank host
Adjournment

Schedule constraints

Surma: Only available on the 25th
Felipe Balbontín: Only available on the 26th or on the 27th in the morning.
Mark Cohen: Not available Monday
Mathias Bynens: Only available on the 28th in the morning (for “Adopting Unicode behavior for set notation in regular expressions” agenda item)
Dan Ehrenberg: will miss the first hour of Thursday
Temporal: Only available in morning sessions. Light preference for Wed/Thurs
Robin Ricard: Only available during the first half of the meeting every day (pre-lunch hours)

Dates and locations of future meetings

Dates	Location
2021-03-09 to 2021-03-10	Remote: PT
2021-04-19 to 2021-04-22	Remote: "New York", ET
2021-05-25 to 2021-05-26	Remote: PT
2021-07-13 to 2021-07-16	Remote: "Tokyo", JST
2021-08-31 to 2021-09-01	Remote: ET
2021-10-25 to 2021-10-28	"London?", GMT
2021-12-14 to 2021-12-15	Remote: PT

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