## 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 # 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 # Import Attributes # https://github.com/tc39/proposal-import-attributes/ import-attributes # Import Assertions (Normative Optional, Deprecated) # This feature should not be implemented, but if it is it must # respect the specified behavior # https://github.com/tc39/proposal-import-attributes/ import-assertions # JSON modules # https://github.com/tc39/proposal-json-modules json-modules # Temporal # https://github.com/tc39/proposal-temporal Temporal # ShadowRealm, née Callable Boundary Realms # https://github.com/tc39/proposal-realms ShadowRealm # Intl.DurationFormat # https://github.com/tc39/proposal-intl-duration-format Intl.DurationFormat # 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 # https://tc39.es/proposal-array-from-async/ Array.fromAsync # JSON.parse with source # https://github.com/tc39/proposal-json-parse-with-source json-parse-with-source # RegExp.escape # https://github.com/tc39/proposal-regex-escaping RegExp.escape # Regular expression modifiers # https://github.com/tc39/proposal-regexp-modifiers regexp-modifiers # Iterator Helpers # https://github.com/tc39/proposal-iterator-helpers iterator-helpers # Promise.try # https://github.com/tc39/proposal-promise-try promise-try # Explicit Resource Management # https://github.com/tc39/proposal-explicit-resource-management explicit-resource-management # Float16Array + Math.f16round # https://github.com/tc39/proposal-float16array Float16Array # Math.sumPrecise # https://github.com/tc39/proposal-math-sum Math.sumPrecise # Source Phase Imports ## https://github.com/tc39/proposal-source-phase-imports source-phase-imports ## test262 special specifier source-phase-imports-module-source # Uint8Array Base64 # https://github.com/tc39/proposal-arraybuffer-base64 uint8array-base64 # Atomics.pause # https://github.com/tc39/proposal-atomics-microwait Atomics.pause ## 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-find-from-last Array.prototype.at Array.prototype.flat Array.prototype.flatMap Array.prototype.includes Array.prototype.values Atomics.waitAsync array-grouping arraybuffer-transfer arrow-function async-iteration async-functions Atomics BigInt caller change-array-by-copy 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 hashbang 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 promise-with-resolvers 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 regexp-v-flag resizable-arraybuffer rest-parameters Set set-methods SharedArrayBuffer string-trimming String.fromCodePoint String.prototype.at String.prototype.endsWith String.prototype.includes String.prototype.isWellFormed String.prototype.matchAll String.prototype.replaceAll String.prototype.trimEnd String.prototype.trimStart String.prototype.toWellFormed super Symbol symbols-as-weakmap-keys 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