Summary for the 70th meeting of Ecma TC39

Ecma Technical Committee 39 held a three day meeting hosted by Stripe in Berlin, Germany on June 4th to June 6th, 2019. Agenda can be found here.

• June 4, 2019 Meeting Notes
• June 5, 2019 Meeting Notes
• June 6, 2019 Meeting Notes

TC39 advanced 3 new proposals to Stage 1, and one proposal went straight to Stage 2.

• Emitter
• evalable
• Host compile value adjustment (combined with evalable)

• Array.isTemplateObject

TC39 discussed 11 proposals for stage advancement and had updates presentations on 4 proposals

• For-in enumeration order
• ECMA-402: Intl.DisplayNames
• Optional Chaining for Stage 2
• Nullish Coalescing for Stage 2

• Top-level await
• WeakRefs

• Dynamic import()
• BigInt

Following proposals did not reach consensus for stage advancement.

• Annex B reform
• JavaScript Standard Library for Stage 2
  • JavaScript Standard Library for Stage 2 [ part 2? ]
• A JavaScript Commons

Updates on proposals that are not seeking stage advancement

• Atomics.waitAsync asking for stage 3 reviewers
• How should we specify Jobs precisely?
  • Continuation of Layering Job Queue
• Trusted types
• Promise.any

TC39 discussed 7 Pull Requests to the existing specification

• Let all early errors be Syntax Errors
• eval(nonString) should not side effect
• Set "name" property for anonymous functions
• ECMA-402: Add quarter option
• ECMA-402: add dayPeriod option
• ECMA-402: add millisecondsDigits option
• Lookup constructor.resolve only once in PerformPromise{All, Race}

• none

Topics related to ECMAScript specification activities that were presented at the meeting.

• Status update on non-JS module types (e.g., JSON, CSS, WebIDL)
• Empirical Evidence for Programming Language Design
• JavaScript and Syntax Research Methods
• Note taking
• How we work

• Report from the ECMA Secretariat
• Next meeting host and logistics
• Updates from the CoC Committee
• ECMA-262 Status Updates
• ECMA-402 (Internationalization) Status Updates
• Test262 Status Updates