ECMAScript 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 This list contains only stage 1 proposals and higher that have not yet been withdrawn/rejected, or become finished.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	✅
🚀	Rest/Spread Properties	Sebastian Markbåge	Sebastian Markbåge	✅
	Asynchronous Iteration	Domenic Denicola	Domenic Denicola	🚧
	`import()`	Domenic Denicola	Domenic Denicola	❓
	RegExp Lookbehind Assertions	Gorkem Yakin, Nozomu Katō, Daniel Ehrenberg	Daniel Ehrenberg, Mathias Bynens	✅
	RegExp Unicode Property Escapes	Mathias Bynens	Brian Terlson, Daniel Ehrenberg, Mathias Bynens	✅
🚀	RegExp named capture groups	Gorkem Yakin, Daniel Ehrenberg	Daniel Ehrenberg, Brian Terlson	✅
	Legacy RegExp features in JavaScript	Claude Pache	Mark Miller, Claude Pache	✅
🚀	`Promise.prototype.finally`	Jordan Harband	Jordan Harband	🚧
	`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	❓

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
🚀	`String.prototype.{trimStart,trimEnd}`	Sebastian Markbåge	Sebastian Markbåge
	Decorators	Daniel Ehrenberg	Yehuda Katz, Brian Terlson, Daniel Ehrenberg
	`throw` expressions	Ron Buckton	Ron Buckton
🚀	`String#matchAll`	Jordan Harband	Jordan Harband
	`Atomics.waitAsync`	Lars Hansen	Shu-yu Guo, Lars Hansen
	JSON superset	Richard Gibson	Mark Miller, Mathias Bynens

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
🚀	`Symbol.prototype.description`	Michael Ficarra	Michael Ficarra
	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

🚀 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:

Transfer your repository to the @tc39-transfer organization

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

@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!).

rektide / tc39-proposals