test262/features.txt

## Proposed language features
#
# This project accepts tests for language proposals that have reached stage 3
# in TC39's standardization process. Those tests should be annotated with a
# dedicated feature flag so that consumers may more easily omit them as
# necessary.
#
# Generally, feature flags should be per proposal, not per individual API
# that a proposal adds. To filter for specific APIs, use the directory
# structure.
#
# https://github.com/tc39/process-document

# Hashbang Grammar
# https://github.com/tc39/proposal-hashbang
hashbang

# Intl.Locale Info
# https://github.com/tc39/proposal-intl-locale-info
Intl.Locale-info

# FinalizationRegistry#cleanupSome
# https://github.com/tc39/proposal-cleanup-some
FinalizationRegistry.prototype.cleanupSome

# Intl.NumberFormat V3
# https://github.com/tc39/proposal-intl-numberformat-v3
Intl.NumberFormat-v3

# Legacy RegExp features
# https://github.com/tc39/proposal-regexp-legacy-features
legacy-regexp

# Atomics.waitAsync
# https://github.com/tc39/proposal-atomics-wait-async
Atomics.waitAsync

# Import Assertions
# https://github.com/tc39/proposal-import-assertions/
import-assertions

# JSON modules
# https://github.com/tc39/proposal-json-modules
json-modules

# Resizable Arraybuffer
# https://github.com/tc39/proposal-resizablearraybuffer
resizable-arraybuffer

# ArrayBuffer transfer
# https://github.com/tc39/proposal-arraybuffer-transfer
arraybuffer-transfer

# Temporal
# https://github.com/tc39/proposal-temporal
Temporal

# ShadowRealm, née Callable Boundary Realms
# https://github.com/tc39/proposal-realms
ShadowRealm

# Array.prototype.findLast & Array.prototype.findLastIndex
# https://github.com/tc39/proposal-array-find-from-last
array-find-from-last

# Array.groupBy & Map.groupBy
# https://github.com/tc39/proposal-array-grouping
array-grouping

# Intl.DurationFormat
# https://github.com/tc39/proposal-intl-duration-format
Intl.DurationFormat

# RegExp set notation + properties of strings
# https://github.com/tc39/proposal-regexp-set-notation
regexp-v-flag

# Decorators
# https://github.com/tc39/proposal-decorators
decorators

# Duplicate named capturing groups
# https://github.com/tc39/proposal-duplicate-named-capturing-groups
regexp-duplicate-named-groups

# Symbols as WeakMap keys
# https://github.com/tc39/proposal-symbols-as-weakmap-keys
symbols-as-weakmap-keys

# Array.prototype.toReversed, Array.prototype.toSorted, Array.prototype.toSpliced,
# Array.prototype.with and the equivalent TypedArray methods.
# https://github.com/tc39/proposal-change-array-by-copy/
change-array-by-copy

# https://tc39.es/proposal-array-from-async/
Array.fromAsync

# Well-formed Unicode strings
# https://github.com/tc39/proposal-is-usv-string
String.prototype.isWellFormed
String.prototype.toWellFormed

# JSON.parse with source
# https://github.com/tc39/proposal-json-parse-with-source
json-parse-with-source

## Standard language features
#
# Language features that have been included in a published version of the
# ECMA-262 specification. These flags are largely maintained for historical
# reasons, though their use for relatively new features (i.e. prior to
# availability across major implementations) is appreciated.

AggregateError
align-detached-buffer-semantics-with-web-reality  # https://github.com/tc39/ecma262/pull/2164
arbitrary-module-namespace-names  # https://github.com/tc39/ecma262/pull/2154
ArrayBuffer
Array.prototype.at
Array.prototype.flat
Array.prototype.flatMap
Array.prototype.includes
Array.prototype.values
arrow-function
async-iteration
async-functions
Atomics
BigInt
caller
class
class-fields-private
class-fields-private-in
class-fields-public
class-methods-private
class-static-block
class-static-fields-private
class-static-fields-public
class-static-methods-private
coalesce-expression
computed-property-names
const
cross-realm
DataView
DataView.prototype.getFloat32
DataView.prototype.getFloat64
DataView.prototype.getInt16
DataView.prototype.getInt32
DataView.prototype.getInt8
DataView.prototype.getUint16
DataView.prototype.getUint32
DataView.prototype.setUint8
default-parameters
destructuring-assignment
destructuring-binding
dynamic-import
error-cause
exponentiation
export-star-as-namespace-from-module  # https://github.com/tc39/ecma262/pull/1174
FinalizationRegistry
for-in-order
for-of
Float32Array
Float64Array
generators
globalThis
import.meta
Int8Array
Int16Array
Int32Array
Intl-enumeration
intl-normative-optional  # https://tc39.es/ecma402/#legacy-constructor
Intl.DateTimeFormat-datetimestyle
Intl.DateTimeFormat-dayPeriod  # https://github.com/tc39/ecma402/pull/346
Intl.DateTimeFormat-extend-timezonename
Intl.DateTimeFormat-formatRange
Intl.DateTimeFormat-fractionalSecondDigits  # https://github.com/tc39/ecma402/pull/347
Intl.DisplayNames
Intl.DisplayNames-v2
Intl.ListFormat
Intl.Locale
Intl.NumberFormat-unified
Intl.RelativeTimeFormat
Intl.Segmenter
json-superset
let
logical-assignment-operators
Map
new.target
numeric-separator-literal
object-rest
object-spread
Object.fromEntries
Object.hasOwn
Object.is
optional-catch-binding
optional-chaining
Promise
Promise.allSettled
Promise.any
Promise.prototype.finally
Proxy
proxy-missing-checks  # https://github.com/tc39/ecma262/pull/666
Reflect
Reflect.construct
Reflect.set
Reflect.setPrototypeOf
regexp-dotall
regexp-lookbehind
regexp-match-indices
regexp-named-groups
regexp-unicode-property-escapes
rest-parameters
Set
SharedArrayBuffer
string-trimming
String.fromCodePoint
String.prototype.at
String.prototype.endsWith
String.prototype.includes
String.prototype.matchAll
String.prototype.replaceAll
String.prototype.trimEnd
String.prototype.trimStart
super
Symbol
Symbol.asyncIterator
Symbol.hasInstance
Symbol.isConcatSpreadable
Symbol.iterator
Symbol.match
Symbol.matchAll
Symbol.prototype.description
Symbol.replace
Symbol.search
Symbol.species
Symbol.split
Symbol.toPrimitive
Symbol.toStringTag
Symbol.unscopables
tail-call-optimization
template
top-level-await
TypedArray
TypedArray.prototype.at
u180e
Uint8Array
Uint16Array
Uint32Array
Uint8ClampedArray
WeakMap
WeakRef
WeakSet
well-formed-json-stringify
__proto__
__getter__
__setter__

## Test-Harness Features
#
# The rare cases where testing language functionality requires non-standard
# language features, exposed through global-environment functions on the $262
# object, go here.

IsHTMLDDA
host-gc-required