ECMAScript proposals

• Stage 0 Proposals
• Finished Proposals
• Inactive Proposals

ECMAScript Internationalization API Specification proposals

Active proposals

Proposals follow this process document. This list contains only stage 1 proposals and higher that have not yet been withdrawn/rejected, or become finished.

Stage 3

🚀	Proposal	Author	Champion	Tests
🚀	Function.prototype.toString revision	Michael Ficarra	Michael Ficarra	✅
	global	Jordan Harband	Jordan Harband	✅
	import()	Domenic Denicola	Domenic Denicola	❓
	Legacy RegExp features in JavaScript	Claude Pache	Mark Miller, Claude Pache	✅
	BigInt	Daniel Ehrenberg	Daniel Ehrenberg	🚧
	Optional catch binding	Michael Ficarra	Michael Ficarra	✅
	import.meta	Domenic Denicola	Domenic Denicola	❓
	Private instance methods and accessors	Daniel Ehrenberg	Daniel Ehrenberg, Kevin Gibbons	❓
	Array.prototype.{flatMap,flatten}	Brian Terlson, Michael Ficarra	Brian Terlson, Michael Ficarra	✅
	Numeric separators	Sam Goto, Rick Waldron	Sam Goto, Rick Waldron	🚧
	Class Public Instance Fields & Private Instance Fields	Daniel Ehrenberg, Kevin Gibbons	Daniel Ehrenberg, Jeff Morrison, Kevin Smith, Kevin Gibbons	❓
	JSON superset	Richard Gibson	Mark Miller, Mathias Bynens
	String.prototype.{trimStart,trimEnd}	Sebastian Markbåge	Sebastian Markbåge	✅
	String.prototype.matchAll	Jordan Harband	Jordan Harband

Stage 2

🚀	Proposal	Author	Champion
	Static class fields and private static methods	Daniel Ehrenberg, Kevin Gibbons, Jeff Morrison, Kevin Smith	Daniel Ehrenberg
	function.sent metaproperty	Allen Wirfs-Brock	Allen Wirfs-Brock
	Decorators	Daniel Ehrenberg	Yehuda Katz, Brian Terlson, Daniel Ehrenberg
🚀	throw expressions	Ron Buckton	Ron Buckton
	Atomics.waitAsync	Lars Hansen	Shu-yu Guo, Lars Hansen
	Symbol.prototype.description	Michael Ficarra	Michael Ficarra

Stage 1

🚀	Proposal	Author	Champion
	Date.parse fallback semantics	Morgan Phillips	Morgan Phillips
	export v from "mod"; statements	Lee Byron	Ben Newman, John-David Dalton
🚀	Observable	Jafar Husain	Jafar Husain, Mark Miller
	WeakRefs	Dean Tribble	Dean Tribble
	Frozen Realms	Mark Miller, Chip Morningstar, Caridy Patiño	Mark Miller, Chip Morningstar, Caridy Patiño
	Math Extensions	Rick Waldron	Rick Waldron
	of and from on collection constructors	Leo Balter	Leo Balter
	Generator arrow functions (=>*)		Brendan Eich, Domenic Denicola
	Promise.try	Jordan Harband	Jordan Harband
	Optional Chaining	Gabriel Isenberg, Claude Pache	Gabriel Isenberg
	Math.signbit: IEEE-754 sign bit	JF Bastien	JF Bastien
	Error stacks	Jordan Harband	Jordan Harband
	do expressions	Dave Herman	Dave Herman
	Realms	Caridy Patiño, Jean-Francois Paradis	Dave Herman, Mark Miller, Caridy Patiño
	Temporal	Maggie Pint, Matt Johnson	Maggie Pint, Brian Terlson
	Float16 on TypedArrays, DataView, Math.hfround	Leo Balter	Leo Balter
	Change Number.parseInt/parseFloat to not coerce null/undefined/NaN (repo link TBD)		Brendan Eich
	Binary AST	Shu-yu Guo	Shu-yu Guo
	Pipeline Operator	Daniel Ehrenberg	Daniel Ehrenberg
	Extensible numeric literals	Daniel Ehrenberg	Daniel Ehrenberg
	First-class protocols	Michael Ficarra	Michael Ficarra
	Nullish coalescing Operator	Gabriel Isenberg	Gabriel Isenberg
	Partial application	Ron Buckton	Ron Buckton
	Cancellation API	Ron Buckton	Ron Buckton & Brian Terlson
	InterpreterDirective	Bradley Farias	Bradley Farias
	String.prototype.replaceAll	Peter Marshall, Jakob Gruber, Mathias Bynens	Mathias Bynens
	String.prototype.codePoints	Ingvar Stepanyan	Mathias Bynens
	Distinguishing literal strings	Mike West	Adam Klein, Mike West
	Object.freeze + Object.seal syntax	Keith Cirkel	Keith Cirkel
	Block Params	Sam Goto	Sam Goto
	{BigInt,Number}.fromString	Mathias Bynens	Mathias Bynens
	Math.seededRandoms()	Tab Atkins	Tab Atkins
	Function.prototype.toString() censorship	Domenic Denicola	Domenic Denicola
	Top-level await	Myles Borins	Myles Borins
	Maximally minimal mixins	Justin Fagnani	Justin Fagnani
🚀	Getting last element of Array	Keith Cirkel	Keith Cirkel
	New Set methods	Michał Wadas	Sathya Gunasekaran
	Collection methods	Michał Wadas	Sathya Gunasekaran

🚀 means the champion thinks it's ready to advance but has not yet presented to the committee.

✅ means a pull request for tests was merged.

❓ means there is no pull request for tests yet.

🚧 means a pull request for tests was created, but not merged yet.

Contributing new proposals

Please see Contributing to ECMAScript for the most up-to-date information on contributing proposals to this standard.

Onboarding existing proposals

Proposals that are Stage 1 and above must be transferred to the TC39 GitHub organization for discoverability and archival purposes. To onboard a proposal that lives outside the TC39 organization:

1. Transfer your repository to the @tc39-transfer organization

• if you are a TC39 delegate, but not an admin in that organization, please contact @LJHarb

2. @bterlson or @littledan will transfer your repository to the TC39 organization the next chance they get.

Note that as part of the onboarding process your repository name may be normalized. Don't worry, repo redirects will continue to work - although Github Pages redirects will be broken (please update your links!).