TC39

Justin Ridgewell
@jasnell.me
@bakkot.com
Matthew Gaudet
@michael.ficarra.me
@nicr.dev
@ptomato.name
@bridgear.bsky.social
@sffc.bsky.social

@andreubotella.com
@ashley-c.bsky.social
Ben Allen
Christian Ulbrich
Caio Lima
@legendecas.bsky.social
@aardvark179.bsky.social
@jordan.har.band
Jonas Haukenes
@jonkuperman.com

and... 👇

Note-takers are the unsung heroes of TC39. Without them, no progress could be made. It is right to give them thanks and praise. Here's to those who helped at the last two meetings! 🥳👏🙌

👇

and withdrew Intl.UnitFormat

ECMAScript Excitement 🎉

Recently, at its 112th meeting, TC39 advanced these proposals:

4️⃣ Upsert: Map.prototype.getOrInsert()
3️⃣ Intl Era/Month Code
2️⃣ import.sync()
1️⃣ Composable Accessors via built-in Decorators
1️⃣ Alias Accessors
1️⃣ Error Option: framesAbove
1️⃣ Error Option: limit

and... 👇

2️⃣ Object.keysLength
1️⃣ Intl Energy Units
1️⃣ Intl Unit Protocol
1️⃣ Object.getNonIndexStringProperties
1️⃣ Typed Array Concatenation
1️⃣ Typed Array Find Within

ECMAScript Excitement 🎉

Recently, at its 111th meeting, TC39 advanced these proposals:

4️⃣ Intl.Locale Info
4️⃣ Iterator.concat
4️⃣ JSON.parse Source Text
3️⃣ [Iterator.zip](github.com/tc39/proposa...)
2️⃣.7️⃣ Iterator.prototype.join
2️⃣.7️⃣ Promise.allKeyed
2️⃣ Error.captureStackTrace
2️⃣ Import Text

and... 👇

@andreubotella.com
Ben Allen
@softwarechris.com
@legendecas.bsky.social
@jessealama.net
@jasnell.me
@bakkot.com
@nicr.dev
@bridgear.bsky.social
@naugtur.pl

Note-takers are the unsung heroes of TC39. Without them, no progress could be made. It is right to give them thanks and praise. Here's to those who helped at this week's meeting! 🥳👏🙌

👇

ECMAScript Excitement 🎉

This week, at its 110th meeting, TC39 advanced these proposals:

3️⃣ Non-extensible applies to Private
2️⃣.7️⃣ Import Bytes
2️⃣.7️⃣ Iterator Chunking
2️⃣ Native Promise Predicate
1️⃣ Array.prototype.pushAll
1️⃣ Native Promise Adoption

Nice.

@andreubotella.com
@jessealama.net
Justin Ridgewell
@bakkot.com
@michael.ficarra.me
@nicr.dev
Richard Gibson
@sffc.bsky.social
Stephen Hicks
@naugtur.pl

Note-takers are the unsung heroes of TC39. Without them, no progress could be made. It is right to give them thanks and praise. Here's to those who helped at this week's meeting! 🥳👏🙌

👇

2️⃣.7️⃣ Intl Era and Month Code
2️⃣ Keep trailing zeros in Intl.NumberFormat and Intl.PluralRules
2️⃣ Import Bytes
1️⃣ Module Global
1️⃣ Array.getNonIndexStringProperties
1️⃣ Object.getOwnPropertySymbols options

ECMAScript Excitement 🎉

This week, at its 109th meeting, TC39 advanced these proposals:

4️⃣ Math.sumPrecise
4️⃣ Uint8Array to/from base64 and hex
3️⃣ Iterator Sequencing
3️⃣ Upsert
3️⃣ Immutable ArrayBuffer

and... 👇

ECMAScript Excitement 🎉

Today, TC39 advanced these proposals:

1️⃣ Array.getNonIndexStringProperties
1️⃣ Object.getOwnPropertySymbols options

ECMAScript Excitement 🎉

Today, TC39 advanced these proposals:

2️⃣.7️⃣ Intl Era and Month Code
2️⃣ Import Buffer
1️⃣ Module Global

ECMAScript Excitement 🎉

Today, TC39 advanced these proposals:

3️⃣ Immutable ArrayBuffer
2️⃣ Keep trailing zeros in Intl.NumberFormat and Intl.PluralRules

ECMAScript Excitement 🎉

Today, TC39 advanced these proposals:

4️⃣ Math.sumPrecise
4️⃣ Uint8Array to/from base64 and hex
3️⃣ Iterator Sequencing
3️⃣ Upsert

The awards are well-deserved; we're fortunate to have them on committee and look forward to their continued participation, hopefully for many years to come.

Congratulations, and thank you both for all you've done!

Ecma International Excitement 🎉

Last week, two TC39 members, Rob Palmer (@robpalmer.bsky.social) and Michael Saboff, received the Ecma Recognition Award for their contributions to Ecma, including TC39.

ECMAScript Excitement 🎉

This week, the Ecma General Assembly approved ECMAScript 2025 (ES2025), the 16th edition.

✨ Duplicate Named Capture Groups
✨ Float16Array
✨ Import Attributes
✨ Iterator Helpers
✨ JSON Modules
✨ Promise.try
✨ RegExp.escape
✨ RegExp Modifiers
✨ Set Methods

4️⃣ Explicit Resource Management
4️⃣ Array.fromAsync
4️⃣ Error.isError
2️⃣ Math.clamp
2️⃣ Seeded Pseudo-Random Numbers
1️⃣ Keep trailing zeros in Intl.NumberFormat and Intl.PluralRules
1️⃣ Random Functions
1️⃣ Inspector, originally a part of the Comparisons proposal

ECMAScript Excitement 🎉

This week, at its 108th meeting, TC39 advanced these proposals:

ECMAScript Excitement 🎉

Today, TC39 advanced this proposal:

1️⃣ Inspector, originally a part of the Comparisons proposal

ECMAScript Excitement 🎉

Today, TC39 advanced these proposals:

2️⃣ Math.clamp
2️⃣ Seeded Pseudo-Random Numbers
1️⃣ Random Functions

ECMAScript Excitement 🎉

Today, TC39 advanced these proposals:

4️⃣ Explicit Resource Management
4️⃣ Array.fromAsync
4️⃣ Error.isError
1️⃣ Keep trailing zeros in Intl.NumberFormat and Intl.PluralRules

ECMAScript Excitement 🎉

This week, at its 107th meeting, TC39 advanced these proposals:

2️⃣.7️⃣ Non-extensible Applies to Private
2️⃣.7️⃣ Upsert
2️⃣ export defer
1️⃣ Compare Strings by Codepoint
1️⃣ Composite Keys
1️⃣ Disposable AsyncContext
1️⃣ Enums
1️⃣ Object.propertyCount

and withdrew Records & Tuples

ECMAScript Excitement 🎉

Today, TC39 advanced this proposal:

1️⃣ Disposable AsyncContext

ECMAScript Excitement 🎉

Today, TC39 advanced these proposals:

2️⃣ export defer
1️⃣ Compare Strings by Codepoint