TypeScript 4.9

For release notes, check out the release announcement.

Downloads are available on:

• npm
• NuGet package

Changes:

• 93bd577 Bump version to 4.9.3 and LKG.
• 107f832 Update LKG.
• 31bee56 Cherry-pick PR #50977 into release-4.9 (#51363) [ #50872 ]
• 1e2fa7a Update version to 4.9.2-rc and LKG.
• 7ab89e5 Merge remote-tracking branch 'origin/main' into release-4.9
• e5cd686 Update package-lock.json
• 8d40dc1 Update package-lock.json
• 5cfb3a2 Only call return() for an abrupt completion in user code (#51297)
• a7a9d15 Fix for broken baseline in yieldInForInInDownlevelGenerator (#51345)
• 7f8426f fix for-in enumeration containing yield in generator (#51295)

See More

• 3d2b401 Fix assertion functions accessed via wildcard imports (#51324)
• 64d0d5a fix(51301): Fixing an unused import at the end of a line removes the newline (#51320)
• 754eeb2 Update CodeQL workflow and configuration, fix found bugs (#51263)
• d8aad26 Update package-lock.json
• d4f26c8 fix(51245): Class with parameter decorator in arrow function causes "convert to default export" refactoring failure (#51256)
• 16faf45 Update package-lock.json
• 8b1ecdb fix(50654): "Move to a new file" breaks the declaration of referenced variable (#50681)
• 170a17f Dom update 2022-10-25 (#51300)
• 9c4e14d Remove "No type information for this code" from baseline (#51311)
• 88d25b4 fix(50068): Refactors trigger debug failure when JSX text has a ' and a tag on the same line. (#51299)
• 8bee69a Update package-lock.json
• 702de1e Fix early call to return/throw on generator (#51294)
• 2c12b14 Add a GH Action to file a new issue if we go a week without seeing a typescript-error-deltas issue (#51271)
• 6af270d Update package-lock.json
• 2cc4c16 Update package-lock.json
• 6093491 Fix apparent typo in getStringMappingType (#51248)
• 61c2609 Update package-lock.json
• ef69116 Generate shortest rootDirs module specifier instead of first possible (#51244)
• bbb42f4 Fix typo in canWatchDirectoryOrFile found by CodeQL (#51262)
• a56b254 Include 'this' type parameter in isRelatedTo fast path (#51230)
• 3abd351 Fix super property transform in async arrow in method (#51240)
• eed0511 Update package-lock.json
• 2625c1f Make the init config category order predictable (#51247)
• 1ca99b3 fix(50551): Destructuring assignment with var bypasses "variable is used before being assigned" check (2454) (#50560)
• 3f28fa1 Update package-lock.json
• 906ebe4 Revert structuredTypeRelatedTo change and fix isUnitLikeType (#51076)
• 8ac4652 change type (#51231)
• 245a02c fix(51222): Go-to-definition on return statements should jump to the containing function declaration (#51227)
• 2dff34e markAliasReferenced should include ExportValue as well (#51219)
• 5ef2634 Update package-lock.json
• d0f0e35 Remove old tslint comments (#51220)
• 85d405a Fixed a false positive "await has no effect on the type" diagnostic with mixed generic union (#50833)
• 1f8959f fix: avoid downleveled dynamic import closing over specifier expression (#49663)
• 11066b2 Rename internal functions to narrowTypeBySwitchOnTypeOf and narrowTypeByInKeyword (#51215)
• 4c9afe8 Update package-lock.json
• f25bcb7 fix(49196): add jsdoc snippet for interface member functions (#51135)
• 7406ee9 fix(51170): Completing an unimplemented property overwrites rest of line (#51175)
• a1d82fc Remove some unnecessary code discovered by rollup (#51204)
• 0481773 LEGO: Merge pull request 51200
• 98c19cb LEGO: Merge pull request 51190
• 13c9b05 Update package-lock.json
• 673475e Update package-lock.json
• f6cf510 Add more tracing to node16/nodenext resolution (#51168)
• 83c5581 Update package-lock.json
• be5f0fe Add an extra regression test for awaited unresolvable recursive union (#51167)
• 2cb7e77 fix(50416): correctly names disabled export refactors (#50663) [ #50416 ]
• 2bcfed0 feat(37440): Provide a quick-fix for non-exported types (#51038)
• a24201c Remove VSDevMode.ps1 and createPlaygroundBuild (#51166)
• 2da62a7 fix(51112): omit parameter names that precede the type (#51142)
• cf1b6b7 feat(51163): show QF to fill in the missing properties for the mapped type. (#51165)
• bdcc240 Remove bug-causing carve-out in conditional type instantiation that hopefully is no longer required (#51151)
• 37317a2 Check nested weak types in intersections on target side of relation (#51140)
• 9f49f9c Update package-lock.json
• 4f54e7e Fix isExhaustiveSwitchStatement to better handle circularities (#51095)
• 503604c Overloads shouldn't gain @deprecated tags of other overloads in quick info (#50904)
• e14a229 Update package-lock.json
• 67256e5 Remove unused declarations array in extractSymbol's TargetRange (#51091)
• 9c87ded fix(51100): ensure tsserver shuts down when parent process is killed (#51107)
• c01ae01 Fix nightly publish oops in Gulpfile (#51131)
• a7d10f1 Update package-lock.json
• d0bfd8c fix(51072): ts.preProcessFile finds import in template string after conditional expression with template strings (#51082)
• ad56b5c Convert scripts/Gulpfile to checked mjs/cjs so they can run without compilation (#50988)
• dbeae5d fix(51017): Make lineText in the references response opt-out (#51081)
• d06a592 Properly defer resolution of mapped types with generic as clauses (#51050)
• 42b1049 Update package-lock.json
• 5f3e6cc Plugin probe location is higher priority than peer node_modules (#51079) [ #34616 ]
• 2648f6a Plugins in project were adding up after every config file reload (#51087)
• c18791c Fix incorrect options type to WatchOptions (#51064)
• b0795e9 Update package-lock.json
• 43c6fd4 Covert some of the config testing to baselines for easy validation (#51063)
• fc5e72b Remove unused defaultWatchFileKind method since useFsEvents is default for tsserver and tsc (#51044)
• 8af9a93 Use typescript.d.ts in APISample tests (#51061)
• 4953316 Remove configureLanguageServiceBuild, instrumenter (#51048)
• 9dfffd0 Update GitHub Actions (#51045)
• 4635a5c Update package-lock.json
• 33a34e5 Adding a JSDoc comment to the es5 type declarations to describe the functionality of Date.now() (#50630)
• 299745c Fix crash in goto-def on @override (#51016)
• 7dcf11f fix(50750): Object type literal with string literal property in contextual typing position causes language service error on all literal type references (#50757)
• 5cd49f6 Update package-lock.json
• 8a1b858 Update package-lock.json
• 96894db Include type parameter defaults in contextual typing (#50994) [ #51002 ]
• 0d0a793 Allow Unicode extended escapes in ES5 and earlier (#50918)
• 58bae8d Update package-lock.json
• 0ce72ef Add option to OrganizeImports for removal only (#50931)
• 42f9143 feat: codefix for for await of (#50623)
• ecf50e8 Properly compute SymbolFlags.Optional for intersected properties (#50958)
• d1586de Fully resolve aliases when checking symbol flags (#50853)
• 45148dd Update LKG to 4.8.4 (#50987)
• 9a83f25 Update package-lock.json
• 865848f Fix <= and > comparisons when compared against prerelease versions (#50915)
• fbfe934 Fix comparability between type parameters related by a union constraint (#50978)
• b09e93d Merge pull request #50041 from microsoft/fix/47969
• 0ac12bb Update package-lock.json
• 8192d55 Pick correct compilerOptions when checking if we can share emitSignatures (#50910) [ #50902 ]
• 16faef1 During uptodate ness check with buildInfo, check if there are errors explicitly with noEmit (#50974) [ #50959 ]
• 63791f5 Update package-lock.json
• 09368bc Handle if project for open file will get recollected because of pending cleanup from closed script info (#50908) [ #50868 ]
• c81bf4d fix(49594): Typescript 4.7.3 bracketed class property compilation error strictPropertyInitialization:true (#49619)
• bc9cbbe Merge pull request #49912 from microsoft/fix/47508
• 5a10f46 Update package-lock.json
• 8e71f42 Fixing pr comments
• c100c64 Update package-lock.json
• 2a91107 Update package-lock.json
• 4ab9e76 Use paths in package.json 'files' array that work with npm 6 and later. (#50930)
• 549b542 Use paths in package.json 'files' array that work with npm 6 and later.
• 7f37d25 Update version to 4.9.1-beta and LKG.
• f16ca7d Remove 'async' dependency, used only in errorCheck.ts, modernize file (#50667)
• c6bef3f LEGO: Merge pull request 50921
• 6753027 Update package-lock.json
• 9740bcc Pluralized hasInvalidatedResolution -> hasInvalidatedResolutions (#50912)
• 84c29cd 🤖 Pick PR #50912 (Pluralized `hasInvalidatedResolutio...) into release-4.9 (#50913)
• a26f634 Merge remote-tracking branch 'origin/main' into release-4.9
• a455955 Make hasInvalidatedResolution non internal for program and add it watchApi (#50776) [ #48057 ]
• 645d1cd Fix assert in addIndirectUser in FAR (#50905)
• bbec17d LEGO: Merge pull request 50900
• a9ecc67 Update package-lock.json
• 221cf55 package.json exports should have priority over typesVersions (#50890)
• acb8977 Remove .github/tsc.json (#50664)
• 7a3de81 fix(49993): skip the quick fix for an expression with an enum type (#50625)
• 2644f28 fix(49200): skip duplicated method declarations (#50609)
• 98652a3 Bump version to 4.9.0-beta and LKG.
• 4d91204 fix(37030): Expand Selection in function and arrow function skips body block (#50711)
• e2dd508 DOM update 2022/09/21 (#50884)
• 1d9ab83 fix(50866): emit modifiers from export declarations (#50874)
• 92a1b12 LEGO: Merge pull request 50877
• e383db6 Fix debug.ts __debugKind check (#50871)
• 01054e0 Consistently add undefined/missing to optional tuple element types (#50831)
• d90795e Improve escape sequence handling in private names (#50856)
• 938a69a Fix import statement completions followed by interface declaration (#50350)
• e002159 feat(49962): Disallow comparison against NaN (#50626)
• 80ae43d Fixing spaces
• abc58bd Fixing baseline errors
• 305f4bd Merge branch 'main' into fix/47969
• 23746af fix(50591): RangeError: Maximum call stack size exceeded (#50594)
• 168186f Allow a union property of a private/protected member and an intersection property including that same member (#50328)
• 812ebcf Update package-lock.json
• 16156b1 Add rules from eslint's recommended set that triggered good lints (#50422)
• a11c416 Improve checking of in operator (#50666)
• 67f2b62 Gabritto/jsemitfixsilly (#50849)
• 3014dec Don't elide imports when transforming JS files (#50404)
• 57c7aa7 LEGO: Merge pull request 50842
• 48a8e89 Improve check of whether type query node possibly contains reference to type parameter (#50070)
• af9ced1 LEGO: Merge pull request 50825
• a8e13f7 Fixed an issue with destructured bindings from a generic union constraint not being narrowed correctly (#50221)
• 08af0b6 Update package-lock.json
• 0df46e8 Fix test around RegExp match vs. exec results (#50813)
• 906510e Fixes for pr
• 2970c5d make RegExpExecArray always include index 0 (#50713)
• 0507192 Accepting baselines
• 29e50b3 Rewording documentation
• 01cae69 fix(50796): omit questionToken in object literal method completions (#50802)
• 3b84f76 Fix crash caused by incorrect bounds check (regression in 4.8) (#50797)
• 7e51306 Update package-lock.json
• 8b35c13 The error "Object is possibly null or undefined" is ambiguous. (#49797)
• a3f51b3 Update user baselines +cc @sandersn (#43554)
• ba10a0d Removing duplicated code
• ec6ae1c Partially revert #41044, restoring parameter destructurings in d.ts files (#50779)
• 28232ca LEGO: Merge pull request 50783
• 49cfa1d Update package-lock.json
• 4110b80 Fix equality narrowing and comparable relation for intersections with {} (#50735)
• b23f1d6 LEGO: Merge pull request 50771
• 618fb2d Update package-lock.json
• 08b91f6 fix(50717): tsc crashes when it sees a JSDoc tag inside an @OverRide annotation (#50724)
• 60963d7 Discriminant of type never should never be matched (#50755)
• e37ea53 Update package-lock.json
• a88c366 Fix test baselining for tsserver host timeouts (#50748)
• 6d38487 Fix workflow typo (#50746)
• 6b890f9 Handle more places where package direcroy is converted to canonical file path (#50740)
• f5f2923 Revert removal of nonInferrableAnyType (#50691)
• 7120b52 Update twoslash workflow (#50738)
• 68d526c Don't run linter after tests runs (#50597)
• 8e5e2e0 Fix backticks in our JSDoc comments (#50737)
• a4cabe7 Support for auto-accessor fields from the Stage 3 Decorators proposal (#49705)
• 7737473 Update package-lock.json
• 12ab0fe Update package-lock.json
• eb40134 Don't leave space for property access on non-integer literals (#50703)
• a70bb9d Preserve special intersections in mapped types (#50704)
• 1a1c271 Don't remove space before dot if in property access on numeric literal (#50695)
• 7c918fb Baseline host state when baselining tsserver tests (#50678)
• 2f1ba45 Update LKG and devDep of typescript to v4.8.3 (#50689)
• be4e9ba Update package-lock.json
• f46a680 Remove error message in node16 (#50673)
• ab831d0 Ignore --help and -? in tsc init generated compilerOptions (#50628)
• bb6f36f Forward intersection state flag to conditional type target check (#50620)
• b58721f Update package-lock.json
• 3c3820b Simplify CI detection (#50661)
• 9ac1fce Fix eslint not looking at certain scripts, fix lints (#50660)
• fd05c0c Make useFsEvents as default strategy for the watching (#50366)
• 5c2f770 Remove unused cancellation from build (#50658)
• 66fbf05 Update package-lock.json
• 7910c50 Update package-lock.json
• fd3a84c Report every instance of TS1208 (#50101)
• 62f980a Check if its same buildinfo only for directly referenced projects and not recursively (#50617) [ #50545 ]
• 856c7c5 Allow {} to narrow in same special cases as unknown (#50601)
• 854d448 in operator shouldn't narrow {} originating in unknown (#50610)
• 549e61d Update package-lock.json
• bcf9949 fix(50079): show deprecated on JSX attributes (#50084)
• 5df09a5 Use bidirectional comparability in narrowing (#50592)
• 891cdc5 Remove unused baselines (#50593)
• 6db2c88 {} & null and {} & undefined should always be never (#50553)
• 238c341 Defer distributing index over generic object types (#50540)
• 2983092 Do not canonicalize the file names when getting absolute paths during nodenext resolution (#50557) [ #50544 ]
• dcade77 Update package-lock.json
• a9797d2 fix(50340): typeof ... === "undefined" check on discriminated union of undefined and object type doesn't narrow correctly (#50344)
• 43f8ae6 Only normalize intersections that include {} (#50535)
• d293e72 Rename API to importPlugin (#50554)
• cd312d3 Managing control flow
• 19defbf Update package-lock.json
• f071d30 Move contributing related info out of README to CONTRIBUTING (#50543)
• 488d0ee Retain name and propertyName in declaration emit copies of binding patterns if property name is a keyword (#50537)
• 8b482b5 Update package-lock.json
• c89f355 Remove redundant pretest script (#50518)
• 6d170b4 Handle intersections in isGenericTypeWithoutNullableConstraint (#50497)
• ed6889c LEGO: Merge pull request 50506
• 29cbfe9 LEGO: Merge pull request 50493
• 6faa291 LEGO: Merge pull request 50484
• 71b2ba6 Reuse computed type of condition expressions (#49881)
• 8778c1d Update package-lock.json
• 4579245 fix(50427): allow convert function expressions (#50430)
• cbc0b17 Push package-lock.json updates via typescript-bot token (#50476)
• bb3a7ae fix(50415): Language server debug failure - Did not expect GetAccessor to have an Identifier in its trivia (#50470)
• 3557092 Rephrase error message to be 100% technically correct (#50471)
• 71d1911 add unknown to DateTimeFormatTypes (#50402)
• 8f89599 Don't include .gitattributes in package (#50475)
• 6e8337e Optimize substitution types (#50397)
• 226dd0b Fix typechecking related lints that changed post 4.8, update LKG to 4.8.2 (#50472)
• 164dddc feat(7481): Operator to ensure an expression is contextually typed by, and satisfies, some type (#46827)
• 0715791 Update package-lock.json
• e675ea8 Remove AUTHORS.md, .mailmap, authors.ts script (#50410)
• 38076df Fix auto import crash due to difference in paths handling (#50419)
• 12eb519 fix(50435): Duplicate seeming Code Actions for convert const to let (#50442)
• a08b045 Jsdoc property description (#50269) [ #47933 ]
• 5ba22e0 Remove top level loc folder (#50421)
• c4eb37c Update package-lock.json
• 8d7ad8c fix(50375): Errors for missing enum-named properties should attempt to preserve names (#50382)
• fb717df Discard union types before considering weak type checks on unit-like types (#50423)
• b9a5bbc Syntax operations also need to ensure project is present for the open script infos since update could be pending to make sure open script info has project (#50418) [ #50131 ]
• 1d4fbbb Update package-lock.json
• 44ce3cf fix(50224): Intellisense for strings within a type's Union doesn't work properly for JSX (#50231)
• 6ee5db9 Use package.json files array instead of .npmignore (#50408)

This list of changes was auto generated.