| ## 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 |
| |
| # 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.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 |
| |
| # 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 |
| |
| # Iterator Helpers |
| # https://github.com/tc39/proposal-iterator-helpers |
| iterator-helpers |
| |
| # Promise.withResolvers |
| # https://github.com/tc39/proposal-promise-with-resolvers |
| promise-with-resolvers |
| |
| ## 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 |
| 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 |
| 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 |
| 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 |
