Summary for the 67th meeting of Ecma TC39

Ecma Technical Committee 39 held a three day meeting hosted by Apple in Cupertino, California on November 27th - November 28th, 2018. Agenda can be found here.

TC39 discussed 1 new proposal that entered the staging process to discuss towards specification.

• Asset References for Stage 1

• Symbol.description
• Function.prototype.toString revision for Stage 4

• Intl.NumberFormat Feature Proposal for Stage 3
• Hash Bang grammar

• dateStyle/timeStyle for Stage 2

These proposals were discussed but did not advance to next stage at the meeting. Please refer to "Conclusion / Resolution" section on the notes to see the outcome of discussion.

• Update on Optional Chaining

Status updates from proposals working towards stage advancement.

• Decorators Stage 2 update

• Withdrawing Distinguishing Literal Strings

• New intermediate class "circular module records"
• A name change from "Module.Instantiate" to "Module.Link".
• Stable sort for Array.prototype.sort
• Memory Model bug DRF-SC bug

• Distinguishing templates: PR Phase 1, Spec Phase 2

• Dynamic modules layering change
• Override mistake fix status update
• isRegExp change

At this meeting, TC39 had break out sessions on following topics. Please see notes for each topic.

• JSExplain, summary of discussion
• JS Explain
• Private Symbols
• Dynamic Modules
• Typed Objects 10:00 am
• Kevin's 1pm Talk (globalThis)
• Standard Libraries
• Summary Session

• Outreach group update
• Report from the Ecma Secretariat
• ECMA 262 Updates
• ECMA 402 Updates
• Test262 Status Updates
• ECMA TC53 Smart Wearable Systems and sensor based devices