Proposal index

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Stage 4 · 99

Proposal	Status	ECMAScript edition
.at()	Finished	ES2022
Accessible Object.prototype.hasOwnProperty	Finished	ES2022
Array find from last	Finished	ES2023
Array Grouping	Finished	ES2024
Array.fromAsync	Finished	ES2026
Array.prototype.{flat,flatMap}	Finished	ES2019
Array.prototype.includes	Finished	ES2016
ArrayBuffer transfer	Finished	ES2024
Async functions	Finished	ES2017
Asynchronous Iteration	Finished	ES2018
Atomics.pause	Finished	ES2027
Atomics.waitAsync	Finished	ES2024
BigInt	Finished	ES2020
Change Array by Copy	Finished	ES2023
Class Fields (Private instance methods and accessors, Class Public Instance Fields & Private Instance Fields, Static class fields and private static methods)	Finished	ES2022
Class Static Block	Finished	ES2022
DateTimeFormat dateStyle & timeStyle	Finished	ES2021
Duplicate named capture groups	Finished	ES2025
Ergonomic brand checks for Private Fields	Finished	ES2022
Error Cause	Finished	ES2022
Error.isError	Finished	ES2026
Explicit Resource Management	Finished	ES2027
Exponentiation operator	Finished	ES2016
Extend TimeZoneName Option Proposal	Finished	ES2022
Float16 on TypedArrays, DataView, Math.f16round	Finished	ES2025
for-in mechanics	Finished	ES2020
Function.prototype.toString revision	Finished	ES2019
globalThis	Finished	ES2020
Hashbang Grammar	Finished	ES2023
Import Attributes	Finished	ES2025
import.meta	Finished	ES2020
import()	Finished	ES2020
Intl Enumeration API	Finished	ES2022
Intl Era and MonthCode Proposal	Finished	ES2026
Intl Locale Info	Finished	ES2026
Intl.DateFormat.prototype.formatRange	Finished	ES2021
Intl.DateTimeFormat.prototype.formatToParts	Finished	ES2017
Intl.DisplayNames	Finished	ES2021
Intl.DisplayNames v2	Finished	ES2022
Intl.DurationFormat	Finished	ES2025
Intl.ListFormat	Finished	ES2021
Intl.Locale	Finished	ES2020
Intl.NumberFormat Unified API Proposal	Finished	ES2020
Intl.NumberFormat V3	Finished	ES2023
Intl.NumberFormat.prototype.formatToParts	Finished	ES2018
Intl.PluralRules	Finished	ES2018
Intl.RelativeTimeFormat	Finished	ES2020
Intl.Segmenter: Unicode Segmentation in JavaScript	Finished	ES2022
iterator chunking	Finished	ES2027
Iterator Includes	Finished	ES2027
Iterator Join	Finished	ES2027
Iterator Sequencing	Finished	ES2026
Joint Iteration	Finished	ES2027
JSON Modules	Finished	ES2025
JSON superset	Finished	ES2019
JSON.parse source text access	Finished	ES2026
Lifting template literal restriction	Finished	ES2018
Logical Assignment Operators	Finished	ES2021
Math.sumPrecise	Finished	ES2026
New Set methods	Finished	ES2025
Nullish coalescing Operator	Finished	ES2020
Numeric separators	Finished	ES2021
Object.fromEntries	Finished	ES2019
Object.getOwnPropertyDescriptors	Finished	ES2017
Object.values/Object.entries	Finished	ES2017
Optional catch binding	Finished	ES2019
Optional Chaining	Finished	ES2020
Promise.allSettled	Finished	ES2020
Promise.any	Finished	ES2021
Promise.prototype.finally	Finished	ES2018
Promise.try	Finished	ES2025
Promise.withResolvers	Finished	ES2024
Redeclarable global eval-introduced vars	Finished	ES2025
RegExp Lookbehind Assertions	Finished	ES2018
RegExp Match Indices	Finished	ES2022
RegExp Modifiers	Finished	ES2025
RegExp named capture groups	Finished	ES2018
RegExp Unicode Property Escapes	Finished	ES2018
RegExp v flag with set notation + properties of strings	Finished	ES2024
RegExp.escape	Finished	ES2025
Resizable and growable ArrayBuffers	Finished	ES2024
Rest/Spread Properties	Finished	ES2018
s (dotAll) flag for regular expressions	Finished	ES2018
Shared memory and atomics	Finished	ES2017
String padding	Finished	ES2017
String.prototype.{trimStart,trimEnd}	Finished	ES2019
String.prototype.matchAll	Finished	ES2020
String.prototype.replaceAll	Finished	ES2021
Symbol.prototype.description	Finished	ES2019
Symbols as WeakMap keys	Finished	ES2023
Sync Iterator helpers	Finished	ES2025
Temporal	Finished	ES2027
Top-level await	Finished	ES2022
Trailing commas in function parameter lists and calls	Finished	ES2017
Uint8Array to/from Base64	Finished	ES2026
Upsert	Finished	ES2026
WeakRefs	Finished	ES2021
Well-formed JSON.stringify	Finished	ES2019
Well-Formed Unicode Strings	Finished	ES2024

Stage 3 · 11

Proposal	Status	ECMAScript edition
Await Dictionary	Active	—
Curtailing the power of "Thenables"	Active	—
Deferring Module Evaluation	Active	—
Dynamic Code Brand Checks	Active	—
Error Stack Accessor	Active	—
Import Text	Active	—
Keep trailing zeros in Intl.NumberFormat and Intl.PluralRules	Active	—
Legacy RegExp features in JavaScript	Active	—
Non-extensible Applies to Private	Active	—
RegExp Buffer Boundaries (\A, \z, \Z)	Active	—
Source Phase Imports	Active	—

Stage 2.7 · 9

Proposal	Status	ECMAScript edition
Decorator Metadata	Active	—
Decorators	Active	—
Deferred Re-exports	Active	—
ESM Phase Imports	Active	—
export all from	Active	—
Immutable ArrayBuffers	Active	—
Import Bytes	Active	—
JSON.parse options	Active	—
ShadowRealm	Active	—

Stage 2 · 28

Proposal	Status	ECMAScript edition
"Discard" (void) Bindings	Active	—
Amount	Active	—
Async Context	Active	—
Async Iterator helpers	Active	—
Bigint from exponential	Active	—
collection normalization	Active	—
Composites	Active	—
Destructure Private Fields	Active	—
Error code property	Active	—
Error.captureStackTrace	Active	—
Extractors	Active	—
Function implementation hiding	Active	—
function.sent metaproperty	Active	—
Fused Multiply-Add	Active	—
Iterator.range	Active	—
Math.clamp	Active	—
Module Declarations	Active	—
Module Expressions	Active	—
Native Promise Predicate	Active	—
Object.keysLength	Active	—
Pipeline Operator	Active	—
Propagate active ScriptOrModule with JobCallback Record	Active	—
SeededPRNG	Active	—
String.dedent	Active	—
Structs: Fixed Layout Objects and Some Synchronization Primitives	Active	—
Symbol Predicates	Active	—
Sync Imports	Active	—
throw expressions	Active	—

Stage 1 · 108

Proposal	Status	ECMAScript edition
{BigInt,Number}.fromString	Active	—
Abort Controller	Active	—
Alias Accessors	Active	—
Array Equality	Active	—
Array filtering	Active	—
Array.prototype.unique()	Active	—
Array.zip and Array.zipKeyed	Active	—
Asset References	Active	—
async do expressions	Active	—
Async initialization	Active	—
await operations	Active	—
BigInt Math	Active	—
Binary AST	Active	—
Block Params	Active	—
Built In Modules (aka JS Standard Library)	Active	—
Bulk-add array elements	Active	—
Call-this operator	Active	—
Cancellation API	Active	—
Change Number.parseInt/parseFloat to not coerce null/undefined/NaN (repo link TBD)	Active	—
class Access Expressions	Active	—
Class Brand Checks	Active	—
Class Method Parameter Decorators	Active	—
Collection methods	Active	—
Compare Strings by Codepoint	Active	—
Comparisons	Active	—
Compartments	Active	—
Composable Accessors via built-in decorators	Active	—
Concurrency Control	Active	—
Cryptographically Secure Random Number Generation	Active	—
DataView get/set Uint8Clamped methods	Active	—
Decimal	Active	—
Declarations in Conditionals	Active	—
Deep Path Properties in Record Literals	Active	—
Disposable AsyncContext.Variable	Active	—
do expressions	Active	—
Double-Ended Iterator and Destructuring	Active	—
Dynamic Modules	Active	—
Emitter	Active	—
Enums	Active	—
eraDisplay option for Intl.DateTimeFormat	Active	—
Error option framesAbove	Active	—
Error option limit	Active	—
Error stacks	Active	—
export v from "mod"; statements	Active	—
Extensions	Active	—
Faster Promise adoption	Active	—
First-class protocols	Active	—
Freezing prototypes	Active	—
Function and Object Literal Decorators	Active	—
Function Memoization	Active	—
Function once	Active	—
Get Intrinsic	Active	—
Grouped Accessors and Auto-Accessors	Active	—
IDL for ECMAScript	Active	—
Improved Escapes for Template Literals	Active	—
Inspector	Active	—
Iterator unique	Active	—
Legacy reflection features for functions in JavaScript	Active	—
Limited ArrayBuffer	Active	—
Linear Matching	Active	—
Locale Extensions	Active	—
Map get and delete	Active	—
Mass Proxy Revocation	Active	—
Maximally minimal mixins	Active	—
Module Global	Active	—
Module Keys	Active	—
Module sync assert	Active	—
Modulus and Additional Integer Math	Active	—
More Currency Display Choices	Active	—
More Random Functions	Active	—
Negated in and instanceof operators	Active	—
new.initialize	Active	—
Object pick/omit	Active	—
Object.freeze + Object.seal syntax	Active	—
Object.propertyCount	Active	—
Observable	Active	—
of and from on collection constructors	Active	—
OOM Fails Fast	Active	—
Optional chaining in assignment LHS	Active	—
Partial application	Active	—
Pattern Matching	Active	—
Policy Maps and Sets	Active	—
Preserve Host Virtualizability	Active	—
Private declarations	Active	—
Prototype pollution mitigation	Active	—
Readonly Collections	Active	—
RegExp \R Escape	Active	—
RegExp Atomic Operators	Active	—
RegExp Extended Mode and Comments	Active	—
Restrict subclassing support in built-in methods	Active	—
Reverse iteration	Active	—
Reversible string split	Active	—
Richer Keys	Active	—
SES (Secure EcmaScript)	Active	—
Signals	Active	—
Slice notation	Active	—
Stabilize	Active	—
Standardized Debug	Active	—
Strict Enforcement of 'using'	Active	—
String.cooked	Active	—
String.prototype.codePoints	Active	—
Support for Distributed Promise Pipelining	Active	—
Type Annotations	Active	—
TypedArray Concat	Active	—
TypedArray Find Within	Active	—
uniform parsing of quasi-standard Date.parse input	Active	—
Unordered Async Iterator Helpers	Active	—
Wavy Dot: Syntactic Support for Promise Pipelining	Active	—

Stage 0 · 16

Proposal	Status	ECMAScript edition
Additional metaproperties	Active	—
as destructuring patterns	Active	—
Catch Guard	Active	—
Defensible Classes	Active	—
Fix 9.2.3 LookupMatcher algorithm	Active	—
Function bind syntax	Active	—
Function expression decorators	Active	—
Intl.NumberFormat round option	Active	—
Method parameter decorators	Active	—
Nested import declarations	Active	—
Object Shorthand Improvements	Active	—
Orthogonal Classes	Active	—
Reflect.{isCallable,isConstructor}	Active	—
Relationships	Active	—
String trim characters	Active	—
Structured Clone	Active	—

Unstaged · 54

Proposal	Status	ECMAScript edition
"use module"	Inactive	—
[Stable Formatting] stable-formatting	Active	—
{Set,Map}.prototype.toJSON	Inactive	—
Annex B — HTML Attribute Event Handlers	Withdrawn	—
ArrayBuffer.prototype.transfer	Withdrawn	—
Blöcks	Withdrawn	—
Builtins.typeOf() and Builtins.is()	Withdrawn	—
Callable class constructors	Withdrawn	—
Cancelable Promises	Withdrawn	—
Date.parse fallback semantics	Inactive	—
Default Behaviours for some Intl APIs	Active	—
Distinguishing literal strings	Withdrawn	—
Dynamic Import Host Adjustment	Withdrawn	—
Dynamic Module Reform	Withdrawn	—
explore associating a unit with a number	Active	—
Extensible numeric literals	Withdrawn	—
Function helpers	Inactive	—
Function.pipe and flow	Withdrawn	—
Generator arrow functions	Withdrawn	—
Generic Comparison	Withdrawn	—
Getting last element of Array	Withdrawn	—
Improving iteration on Objects	Withdrawn	—
Intl Energy Units	Active	—
Intl LocaleMatcher	Active	—
Intl Sequence Units	Active	—
Intl.DateTimeFormat Alignment With Other Standards	Active	—
Intl.MessageFormat	Active	—
Intl.MessageResource	Active	—
Intl.Segmenter v2	Active	—
Intl.ZonedDateTimeFormat	Active	—
isTemplateObject	Withdrawn	—
JSON.tryParse	Inactive	—
Math Extensions	Withdrawn	—
Math.signbit: IEEE-754 sign bit	Withdrawn	—
Normative ICU Reference	Withdrawn	—
Object enumerables	Inactive	—
Object.shallowEqual	Withdrawn	—
Operator overloading	Withdrawn	—
Proposed Grammar change to ES Modules	Inactive	—
Record & Tuple	Withdrawn	—
RefCollection	Withdrawn	—
RegExp Atomic Groups & Possessive Quantifiers	Inactive	—
Sequence properties in Unicode property escapes	Withdrawn	—
SIMD.JS - SIMD APIs	Inactive	—
Smart Unit Preferences in Intl.NumberFormat	Active	—
Symbol.thenable	Withdrawn	—
Tagged Collection Literals	Withdrawn	—
Typed Objects	Inactive	—
TypedArray stride parameter	Withdrawn	—
Unused Function Parameters	Inactive	—
Updates to Tail Calls to include an explicit syntactic opt-in	Inactive	—
UUID	Withdrawn	—
WeakRefs cleanupSome	Withdrawn	—
Zones	Withdrawn	—

#Proposal index

#Stage 4 · 99

#Stage 3 · 11

#Stage 2.7 · 9

#Stage 2 · 28

#Stage 1 · 108

#Stage 0 · 16

#Unstaged · 54

Proposal index

Stage 4 · 99

Stage 3 · 11

Stage 2.7 · 9

Stage 2 · 28

Stage 1 · 108

Stage 0 · 16

Unstaged · 54