Jan 2023

[jridgewell]

https://github.com/tc39/agendas/blob/main/2023/01.md

[jridgewell]

Prototype pollution mitigation / Symbol.proto for Stage 1 (slides) reaches Stage 1

[jridgewell]

Symbol as WeakMap key for Stage 4 (spec) reaches Stage 4

[jridgewell]

Change Array by copy for Stage 4 (spec) reaches Stage 4

[jridgewell]

Intl.NumberFormat V3 for Stage 4 (spec, slides) reaches Stage 4

[jridgewell]

Intl.DurationFormat Stage 3 update (Slides TBW) has consensus

[jridgewell]

Explicit Resource Management Stage 3 update (slides, spec) gets consensus on:

• Ban await as Identifier in using
• Ban using in top level of eval

[jridgewell]

Discuss SuppressedError argument overlap: error and cause (issue) gets consensus to remove cause from a SuppressedError

[jridgewell]

Intl Locale Info API Stage 3 update (Slides, spec) got consensus on things but the conclusion notes aren't written yet…

[ehoogeveen-medweb]

Looks like they chose to add get prefixes: tc39/proposal-intl-locale-info#67 has been merged.

[jridgewell]

Parallel async iterators via a tweak to iterator helpers (slides, proposal) reaches consensus:

• Sync iterators remain at Stage 3
• Async iterators are split and relegated to Stage 2 to discuss parallelism

[jridgewell]

Async Contexts for Stage 1 (slides) reaches Stage 1

[jridgewell]

ArrayBuffer transfer for Stage 3 (slides, spec) reaches Stage 3

[jridgewell]

Intl era and monthCode for Stage 2 (slides, spec) reaches Stage 2

[jridgewell]

Temporal Stage 3 update and normative PRs (slides, spec) got consensus on everything except tc39/proposal-temporal#2479

[jridgewell]

Symbol Predicates for stage 2 reaches Stage 2 with static methods

[jridgewell]

Async Explicit Resource Management for Stage 3? (slides, spec) reaches Stage 3, but the using await and async using syntax discussion is still ongoing (and will be resolved by the next meeting)

[ljharb]

in other words, it's not at stage 3 yet, but it will become so once the one outstanding issue is resolved.

[jridgewell]

getIntrinsic, with an iterator for stage 2 remains at Stage 1, concerns about memory problems being pushed into the engine

[jridgewell]

Problems with import assertions for module types and a possible general solution + downgrade to Stage 2 (HTML issue, slides, slides for continuation) relegates Import Assertions to Stage 2, but we're relaxing the host evaluation restriction. We'll reconsider syntax and semantics to solve the Web's usecase.

[jridgewell]

Decorator context.access object API (issue) gets consensus on both points

[jridgewell]

Decorators and export Ordering (issue, slides) achieves consensus on:

• Both valid before and after the export keyword, but exclusively before or after
• toString will not include decorators before, it's cut off at the export keyword

[zloirock]

What about JSON discussion?

[jridgewell]

JSON.parse source text access Stage 3 update (slides, spec) got consensus to merge #35 and #39, expect to advance next meeting.

[trusktr]

• Both valid before and after the export keyword, but exclusively before or after

Does this mean we can no longer add export decorators in future extensions?

That seems like a sad choice?