24 Pull requests merged by 14 people

• LEGO: Pull request from lego/hb_5378966c-b857-470a-8675-daebef4a6da1_20250611192551558 to main

  #61846 merged Jun 11, 2025

• fix link to "Help Wanted" issues

  #61843 merged Jun 11, 2025

• Port "Improve type discrimination algorithm" from tsgo

  #61828 merged Jun 9, 2025

• Restore import defer = parsing

  #61837 merged Jun 9, 2025

• Fix type variable leaks and cache inconsistencies

  #61668 merged Jun 9, 2025

• Add --module node20

  #61805 merged Jun 9, 2025

• optimization, reduce memory usage

  #61822 merged Jun 9, 2025

• Avoid resolving source prop type when the target is unknown/any

  #61660 merged Jun 6, 2025

• Fix helpers emit for .cjs files in ESM module mode

  #61814 merged Jun 6, 2025

• Issue "'{0}' declarations can only be declared inside a block." for block-scoped variables in presence of parse errors

  #61824 merged Jun 6, 2025

• explicitly disallow using in ambient contexts

  #61781 merged Jun 6, 2025

• Add lib.esnext.sharedmemory

  #61646 merged Jun 6, 2025

• Cache mapper instantiations

  #61505 merged Jun 6, 2025

• feat: add Error.isError() to ESNext lib

  #60788 merged Jun 6, 2025

• Add support for import defer proposal

  #60757 merged Jun 6, 2025

• tsc --init update

  #61813 merged Jun 6, 2025

• fix(checker): report error when using bigint as enum key

  #61777 merged Jun 5, 2025

• fix(61747): for (using of = is incorrectly parsed

  #61764 merged Jun 5, 2025

• LEGO: Pull request from lego/hb_5378966c-b857-470a-8675-daebef4a6da1_20250604192236101 to main

  #61815 merged Jun 4, 2025

• Initialize the map for dts to reference and source to reference when parsing project reference as its always needed

  #61746 merged Jun 4, 2025

• Update pr_owners.txt

  #61798 merged Jun 3, 2025

• Handle lock file 3 version when caching the typings ensuring we can reuse already installed packages

  #61730 merged May 21, 2025

• Fix getResolvePackageJsonImports utility

  #61707 merged May 16, 2025

• Stop reassigning .valueDeclaration to avoid replacing earlier declarations with late ones

  #60857 merged May 15, 2025

28 Pull requests opened by 19 people

• Improve `@throws {@link CustomError}` handling

  #61722 opened May 18, 2025

• [WIP] Resolution sharing

  #61732 opened May 19, 2025

• Simplify async iterator types

  #61733 opened May 19, 2025

• Suggest completions for type arguments of expressions

  #61758 opened May 23, 2025

• Add IntegerTypedArray type for use with crypto.getRandomValues

  #61767 opened May 27, 2025

• Fix missing ClassificationType.regularExpressionLiteral cases in classifier switch statements

  #61775 opened May 28, 2025

• Improve TypeScript error messages for long type assignments

  #61776 opened May 28, 2025

• Reuse single errored signature candidate as resolved signature

  #61787 opened May 30, 2025

• Fixed control flow Analysis of aliased discriminants with parenthesized initializers

  #61788 opened May 31, 2025

• Assign contextual parameter types to functions with type parameters

  #61792 opened Jun 1, 2025

• Fix capitalisation for `checkJs`

  #61795 opened Jun 1, 2025

• fix: const declarations inside block to be more aggressive

  #61796 opened Jun 1, 2025

• Bump the github-actions group across 1 directory with 3 updates

  #61804 opened Jun 2, 2025

• Add check for unknown type

  #61810 opened Jun 4, 2025

• lib: narrow `Atomics.wait*` target to SharedArrayBuffer views

  #61817 opened Jun 4, 2025

• Fixed JSDoc display on `JsxNamespacedName` attributes

  #61825 opened Jun 6, 2025

• Overloads for String.prototype.split method

  #61827 opened Jun 7, 2025

• Type width in error messages

  #61829 opened Jun 7, 2025

• Add suggestion diagnostic for enum computed string keys (#42468)

  #61839 opened Jun 10, 2025

• Adds type Something = {}

  #61848 opened Jun 11, 2025

• fix: diagnostic message for class name 'Object' when targeting different ECMAScript versions

  #61850 opened Jun 12, 2025

• Fixed types of parenthesized expressions at locations with `@satisfies` and `@type` mix

  #61852 opened Jun 12, 2025

• [WIP] Reference missing with declare module

  #61854 opened Jun 12, 2025

• [WIP] Invalid quick fix for class that's exported as a variable with `isolatedDeclarations`

  #61855 opened Jun 12, 2025

• Fixed crash on `ComputedPropertyName` when computing interactive inlay hints

  #61857 opened Jun 12, 2025

• Watch failed lookups, affecting locations only if resolution was failed

  #61861 opened Jun 13, 2025

• 🤖 Pick PR #61861 (Watch failed lookups, affecting loc...) into release-5.8

  #61864 opened Jun 13, 2025

• fix(61867): fix find-all-refs for constructors involving string literals

  #61869 opened Jun 14, 2025

94 Issues closed by 36 people

• await (await fn()).method() gets wrong type in intellisense

  #61849 closed Jun 13, 2025

• `ArrayLiteral` instead of `ArrayBindingPattern` as loop variable

  #61853 closed Jun 13, 2025

• Add getBoundingClientRect to EventTarget type

  #61836 closed Jun 13, 2025

• Invalid quick fix for function returning `Promise<unknown>` with `isolatedDeclarations`

  #61642 closed Jun 12, 2025

• finally

  #61851 closed Jun 12, 2025

• require(esm) 'module.exports' interop export name support

  #61645 closed Jun 12, 2025

• lib.dom.d.ts: AudioContextState enum is missing "interrupted" state

  #61823 closed Jun 12, 2025

• enum member key should reject computed string

  #61834 closed Jun 12, 2025

• CONTRIBUTING.md broken link to "Help Wanted" issues

  #61844 closed Jun 11, 2025

• Leading Rest element in tuples are kinda broken !?

  #61842 closed Jun 10, 2025

• Typescript compiler hangs indefinitely

  #61422 closed Jun 10, 2025

• Merging objects by spreading 2 objects infers wrong type

  #61840 closed Jun 10, 2025

• isNaN should accept string by ts

  #61841 closed Jun 10, 2025

• VSCode's Intellisense breaks when using tsconfig's references

  #61830 closed Jun 10, 2025

• Type variable leak and odd error

  #61667 closed Jun 9, 2025

• React's ComponentProps type issues in TypeScript 5.6.2

  #59937 closed Jun 9, 2025

• Functions unnecessarily wrapped into lambda functions

  #61821 closed Jun 9, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250608 vs 5.8.3

  #61833 closed Jun 9, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250608 vs 5.8.3

  #61832 closed Jun 9, 2025

• [NewErrors] 5.9.0-dev.20250608 vs 5.8.3

  #61831 closed Jun 9, 2025

• node.js `fetch` is wrongly typed

  #61826 closed Jun 9, 2025

• Potentially misleading documentation for the `types` TSConfig option

  #61256 closed Jun 8, 2025

• renamedDependencies not working with ESM

  #61811 closed Jun 8, 2025

• Intersection of `object` and array breaks homomorphism

  #61745 closed Jun 8, 2025

• Spreading constrained generic parameters allows for invalid/unsafe return types

  #61754 closed Jun 8, 2025

• Overloads for String.prototype.split method

  #61816 closed Jun 8, 2025

• not tracking potential state change in object literal with literal type property

  #61761 closed Jun 7, 2025

• Don't allow a `Record` keyed by a template literal type to be assigned to a type without a compatible index signature

  #61782 closed Jun 7, 2025

• Support cyclical type inference of self-referential data structures, when subject to some assignability constraints

  #61659 closed Jun 6, 2025

• "'const' declarations can only be declared inside a block" should be issued more aggressively

  #61734 closed Jun 6, 2025

• `declare namespace { using ... }` generates incorrect dts

  #61752 closed Jun 6, 2025

• Add Error.isError() to ESNext lib

  #60787 closed Jun 6, 2025

• `import defer` Stage 3 proposal support

  #59391 closed Jun 6, 2025

• tsc --init update 2024

  #58420 closed Jun 6, 2025

• Make the `sourceFile.commentDirectives` property public

  #61809 closed Jun 6, 2025

• ts plugin provide color

  #61773 closed Jun 6, 2025

• noUnusedLocals doesn't error when using a ...rest declaration

  #61748 closed Jun 6, 2025

• `someBool || true` gets the literal type `true` when assigned to a `let` variable at initialization (unlike `true` getting the type `boolean`)

  #61799 closed Jun 6, 2025

• Declaration Order Affects Type Checking

  #61806 closed Jun 6, 2025

• enum member key should reject bigint

  #61772 closed Jun 5, 2025

• `for (using of =` is incorrectly parsed.

  #61747 closed Jun 5, 2025

• Critical null pointer bug in incremental builder: affectedFilesIndex undefined access

  #61808 closed Jun 3, 2025

• [NewErrors] 5.9.0-dev.20250601 vs 5.8.3

  #61800 closed Jun 3, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250601 vs 5.8.3

  #61803 closed Jun 3, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250601 vs 5.8.3

  #61802 closed Jun 3, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250525 vs 5.8.3

  #61765 closed Jun 3, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250525 vs 5.8.3

  #61763 closed Jun 3, 2025

• [NewErrors] 5.9.0-dev.20250525 vs 5.8.3

  #61762 closed Jun 3, 2025

• Reference issue for PR #61796: Make const declarations inside block more aggressive

  #61797 closed Jun 1, 2025

• Deprecate `appendChild` in favor of `append`

  #61778 closed May 31, 2025

• tsc - This is not the tsc command you are looking for

  #61786 closed May 30, 2025

• I'm

  #61771 closed May 29, 2025

• new short for expression variable == null ? value : variable; ts(2345)

  #61779 closed May 29, 2025

• Mr

  #60281 closed May 29, 2025

• Narrowing for constant indexed access fails on array getter

  #58803 closed May 28, 2025

• TS looses track of enum coming from module declaration

  #61744 closed May 26, 2025

• TS2823 import attributes error when using node16 module

  #60507 closed May 23, 2025

• api albaRiyhm link cycle

  #61757 closed May 23, 2025

• private constructor(){}, It is necessary to also explicitly limit instantiation in the compiled js

  #61736 closed May 23, 2025

• Unexpected differences in distribution over union types: type string | 5 behaves differently than type string | [5]

  #61753 closed May 22, 2025

• Assingment type inference is broken with map, forEach

  #61755 closed May 22, 2025

• Overriding type of union works as declared type but not as generic type

  #61729 closed May 22, 2025

• TS Server Plugin rename supoort transform user input

  #61702 closed May 22, 2025

• Function definition parameter type inference

  #61715 closed May 22, 2025

• Suggestion: Reword error message "Property has no initializer and is not definitely assigned in the constructor"

  #61737 closed May 21, 2025

• Type predicates that are not biconditional

  #61740 closed May 21, 2025

• Monorepo workspace packages in devDependencies are not considered for auto-imports

  #61709 closed May 20, 2025

• `convertFunctionToEs6Class` codefix is never triggered — TS80002 diagnostic not reported

  #61738 closed May 20, 2025

• Iterators/Generators, next(), and unsafe yield statement types

  #58381 closed May 20, 2025

• Required properties inside computed property name not detected

  #61731 closed May 19, 2025

• [ServerErrors][TypeScript] 5.9.0-dev.20250518 vs 5.8.3

  #61725 closed May 19, 2025

• [ServerErrors][JavaScript] 5.9.0-dev.20250518 vs 5.8.3

  #61724 closed May 19, 2025

• [NewErrors] 5.9.0-dev.20250518 vs 5.8.3

  #61723 closed May 19, 2025

• Boolean type is not inferred correctly when a variable is declared with `let`

  #61727 closed May 19, 2025

• Typescript fail to parse JSX syntax correctly

  #61720 closed May 19, 2025

• Exported types in an ESM namespace are not "nameable" (have repro)

  #61700 closed May 19, 2025

• `jsconfig.*.json` don't have `"allowJs": true` by default

  #61704 closed May 19, 2025

• False negative on exhaustive type guard on multilevel union

  #61708 closed May 19, 2025

• `click` event's interface should be changed to `PointerEvent`

  #60746 closed May 18, 2025

• TypeChecker: Symbol.getDeclarations() returns undefined declarations when used with complex generic types

  #61697 closed May 18, 2025

• Strange vscode typescript intellisense bug.

  #61705 closed May 18, 2025

• Type narrow not worked with this union type.

  #61701 closed May 18, 2025

• type of FetchEvent.handled shold be Promise<undefined> not Promise<void>;

  #61703 closed May 18, 2025

• Type assertion of readonly array property doesn't work only with a class type (static property).

  #61719 closed May 17, 2025

• File '/path/hsciiwapp/node_modules/hsciistr/dist/hsciistr.d.ts' is not a module.ts(2306)

  #61693 closed May 17, 2025

• `tsserver` diagnostic discrepancy on identifier completion

  #60606 closed May 16, 2025

• Mangling interface bindings to indicate identifier type

  #61710 closed May 16, 2025

• JSDoc property modifiers on computed properties

  #60590 closed May 15, 2025

• How to get the name of the codefix from getSupportedCodeFixes?

  #61679 closed May 15, 2025

• Recursive Type Field Validation + Suggest, compile, fail over, Improve Transform of Circular Types Generic type hint Circular<type>

  #61685 closed May 15, 2025

• Generic constraint `extends` is confusing

  #61694 closed May 15, 2025

• Circular Generic Type Transforms to New mutation Circular Generic Types

  #61686 closed May 15, 2025

• Problem of losing "this" context in class method when casting to arrow function

  #61684 closed May 15, 2025

• Readonly methods and readonly types

  #61690 closed May 15, 2025

48 Issues opened by 43 people

• `T` satisfies a constraint that `E extends T` does not (specifically with `Omit`)

  #61870 opened Jun 14, 2025

• Homomorphic mapped types with arrays doesn't work well with recursive arrays

  #61868 opened Jun 14, 2025

• TypeError: Cannot read properties of undefined (reading 'length')

  #61867 opened Jun 14, 2025

• Distributive generic with extends constraint not assignable to original non-distributed type

  #61866 opened Jun 14, 2025

• Build instructions of TypeScript

  #61865 opened Jun 14, 2025

• Class decorators run before class static side is fully defined when downleveling

  #61862 opened Jun 13, 2025

• Comment like jsx text emitted twice when preserve enabled

  #61860 opened Jun 13, 2025

• [isolatedDeclarations] explicit annotation required when `satisfies T` is provided on an object that would otherwise be inferrable

  #61859 opened Jun 13, 2025

• Add type something = {}

  #61847 opened Jun 11, 2025

• No inlay hints. provideInlayHints results in Debug Failure. Unexpected node.

  #61845 opened Jun 11, 2025

• Way to detect whether a callable has type parameters

  #61838 opened Jun 10, 2025

• The second parameter type of `apply` should be `ArrayLike<T>` instead of `T[]`

  #61835 opened Jun 9, 2025

• JSX `JsxNamespacedName` breaks JSDoc + QuickInfo in VSCode

  #61820 opened Jun 6, 2025

• Pipe Operator instead of conditions and deep extends

  #61819 opened Jun 5, 2025

• Misleading error for a generic parameter with a default involving `this`

  #61812 opened Jun 4, 2025

• Incorrect capitalisation for `checkJs`

  #61801 opened Jun 1, 2025

• `tsBuildInfoFile` is not extendable. Add an alternative `tsBuildInfoDir` option

  #61794 opened Jun 1, 2025

• Cannot assign Uint8Array type to Uint8Array variable created with constructor

  #61793 opened Jun 1, 2025

• Parameters in functions with type parameters are not contextually-typed

  #61791 opened Jun 1, 2025

• Please always add default values to `tsconfig.json` documentation

  #61790 opened Jun 1, 2025

• Skip assignment narrowing when declaring & initializing a variable in the same statement

  #61789 opened May 31, 2025

• "Used before initialization" error false positives and negatives with optional properties

  #61785 opened May 30, 2025

• Parenthesis break narrowing.

  #61784 opened May 29, 2025

• Function implementation name must be ... (2389) when abstract method is declared again later

  #61783 opened May 29, 2025

• ReturnType is lost after a simple wrapper function

  #61780 opened May 29, 2025

• Intellisense should offer "constructor" property (Javascript)

  #61863 opened May 27, 2025

• Allow narrowing of unions discriminated by numeric literals using `>` `<` etc

  #61770 opened May 27, 2025

• [DTS] Object literal method with bigint is omitted in generated `.d.ts`, but class method works correctly

  #61769 opened May 27, 2025

• `IntegerTypedArray` type required for use with `crypto.getRandomValues`

  #61768 opened May 27, 2025

• Reference missing with declare module

  #61766 opened May 26, 2025

• Disallow bitwise operators with different const enum types

  #61760 opened May 25, 2025

• [BUG] This JSX tag requires the module path 'react/jsx-runtime' to exist, but none could be found. Make sure you have types for the appropriate package installed.

  #61756 opened May 22, 2025

• Completions for type arguments of expressions

  #61751 opened May 22, 2025

• Tuples: maintaining type-param in the type of it's items

  #61750 opened May 22, 2025

• Intersection with a mapped type breaks bypassing private assignability.

  #61743 opened May 21, 2025

• Design Meeting Notes, 5/21/2025

  #61742 opened May 21, 2025

• Missing references in TypeScript

  #61741 opened May 21, 2025

• Add ES2025 target and library

  #61735 opened May 20, 2025

• Poor quick info due to erroneously deferring `keyof T` since #51621

  #61728 opened May 19, 2025

• Mixing base class defeats circularity protection

  #61721 opened May 18, 2025

• Emitted declarations for JS file do not import a class if it's re-exported

  #61718 opened May 17, 2025

• `tsc --build --watch` produces stray `.js`/`.js.map` files when adding a file to upstream project

  #61717 opened May 17, 2025

• Double initializing a `readonly` field should not be allowed

  #61716 opened May 17, 2025

• `using` transform throws when a for body binding shadows the for head binding

  #61714 opened May 16, 2025

• Missing Intl.Locale.prototype.getWeekInfo()

  #61713 opened May 16, 2025

• Add option to remove "move to new file" quick fix

  #61712 opened May 16, 2025

• Resolution order dependent circular heritage

  #61711 opened May 16, 2025

• `Object.groupBy` should not return `Partial<Record<string, T>>` or `Partial<Record<number, T>>`

  #61706 opened May 15, 2025

133 Unresolved conversations

Sometimes conversations happen on old items that aren’t yet closed. Here is a list of all the Issues and Pull Requests with unresolved conversations.

• Add type definitions for `Uint8Array` to/from base64 methods

  #61696 commented on Jun 5, 2025 • 3 new comments

• Fixed an issue with `ReduceLabel` flows spoiling node reachability cache

  #61265 commented on Jun 6, 2025 • 1 new comment

• fix `Intl.Segments#containing` return value type

  #61236 commented on May 15, 2025 • 1 new comment

• Disable type checking for node_modules entirely

  #40426 commented on Jun 11, 2025 • 0 new comments

• `@experimental` JSDoc tag, with strikethrough style (or similar) like `@deprecated` JSDoc tag

  #56808 commented on Jun 11, 2025 • 0 new comments

• Allow ignoring certain TS suggestion-level diagnostic codes

  #28825 commented on Jun 11, 2025 • 0 new comments

• Mapped type with enum keys emits string keys in d.ts type, but uses enum keys in .ts type

  #60247 commented on Jun 12, 2025 • 0 new comments

• Proposal: Partial Type Argument Inference

  #26242 commented on Jun 12, 2025 • 0 new comments

• Invalid quick fix for class that's exported as a variable with `isolatedDeclarations`

  #61644 commented on Jun 12, 2025 • 0 new comments

• 6.0 Deprecation Candidates

  #54500 commented on Jun 12, 2025 • 0 new comments

• Support overload resolution with type union arguments

  #14107 commented on Jun 13, 2025 • 0 new comments

• disallow comparing to null and undefined unless they are valid cases in strict null mode

  #11920 commented on Jun 14, 2025 • 0 new comments

• Support @class in JSDoc

  #12681 commented on Jun 14, 2025 • 0 new comments

• Error inferring types of promise function

  #17873 commented on Jun 14, 2025 • 0 new comments

• this any typed in some JS object literals

  #22058 commented on Jun 14, 2025 • 0 new comments

• Suggestion: Type annotations and interfaces for function declarations

  #22063 commented on Jun 14, 2025 • 0 new comments

• Allow extending types referenced through interfaces

  #31843 commented on Jun 14, 2025 • 0 new comments

• Support Intellisense for string/number literals in a widened union

  #33471 commented on Jun 14, 2025 • 0 new comments

• Implicit Symbol.iterator call in for..of loops / spread destructuring doesn't infer `this` generic type parameter

  #38388 commented on Jun 14, 2025 • 0 new comments

• refactor: New file generates import from wrong module specifier

  #58897 commented on Jun 11, 2025 • 0 new comments

• tsc not respecting types/typeRoots config for imported modules

  #43094 commented on Jun 11, 2025 • 0 new comments

• VSCode errors when refactoring JavaScript to new file

  #60180 commented on Jun 10, 2025 • 0 new comments

• Destructuring into an empty object vs an object with existing properties yields different results

  #60386 commented on Jun 10, 2025 • 0 new comments

• Allow specifying exclude as a command line option

  #46005 commented on Jun 10, 2025 • 0 new comments

• [Feature request]type level equal operator

  #48100 commented on Jun 10, 2025 • 0 new comments

• [Proposal] Type assertion statement (type cast) at block-scope level

  #10421 commented on Jun 10, 2025 • 0 new comments

• Don't require to implement optional abstract properties

  #40635 commented on Jun 10, 2025 • 0 new comments

• Incorrect emit for parameter properties when using standard class fields

  #55132 commented on Jun 9, 2025 • 0 new comments

• Unable to access ServiceWorkerGlobalScope via `self.`

  #14877 commented on Jun 8, 2025 • 0 new comments

• Use the width of a type to add newlines in type assignment error messages

  #45896 commented on Jun 8, 2025 • 0 new comments

• Array method definition revamp: Use case collection

  #36554 commented on Jun 6, 2025 • 0 new comments

• Improve string split return type of first array index

  #53362 commented on Jun 6, 2025 • 0 new comments

• Generic TypedArray constructors have only one overload

  #61680 commented on Jun 5, 2025 • 0 new comments

• Switch-like statement to avoid repetitive 'extends' ternary

  #51375 commented on Jun 5, 2025 • 0 new comments

• Pipe/flow/chain type support

  #30370 commented on May 21, 2025 • 0 new comments

• Don't compare "missing" to `undefined` in `compareProperties` under `exactOptionalPropertyTypes`

  #61683 commented on Jun 10, 2025 • 0 new comments

• Compare optional property flag when comparing against discriminant properties under `exactOptionalPropertyTypes`

  #61682 commented on May 19, 2025 • 0 new comments

• docs(lib): add @throws JSDoc for BigInt methods and constructor

  #61653 commented on May 29, 2025 • 0 new comments

• Check expression operand equivalence in isMatchingReference before computing property key equivalence

  #61608 commented on May 27, 2025 • 0 new comments

• Infer type arguments on instance check

  #58028 commented on Jun 9, 2025 • 0 new comments

• Implement a `@nonnull` JSDoc tag

  #57042 commented on Jun 12, 2025 • 0 new comments

• [wip] Type acquisition and module resolution updates

  #56074 commented on May 16, 2025 • 0 new comments

• [wip] Shared resolutions in tsserver

  #55968 commented on May 17, 2025 • 0 new comments

• Mark all unreachable executable statements in cases and source files

  #55588 commented on May 15, 2025 • 0 new comments

• Add numeric constraints to type parameters of mapped types with narrowed down array constraints

  #55386 commented on May 27, 2025 • 0 new comments

• Add nested call and new expressions as potential intra expression inference sites

  #54183 commented on May 19, 2025 • 0 new comments

• fix issue 53775, do not always narrow to property signature

  #54110 commented on May 20, 2025 • 0 new comments

• Allow some per file compiler options

  #49886 commented on May 23, 2025 • 0 new comments

• "The inferred type of X cannot be named without a reference to Y" (TS2742) still happens, when working with npm link to link packages manually

  #58914 commented on Jun 14, 2025 • 0 new comments

• Spurious "referenced directly or indirectly in its own initializer" when combined with narrowing, asserts function, and loop

  #53955 commented on Jun 14, 2025 • 0 new comments

• Inconsistent typechecking with require() in JS and TS

  #60032 commented on Jun 14, 2025 • 0 new comments

• Error not issued when global type is an alias of an object type literal

  #57564 commented on Jun 14, 2025 • 0 new comments

• Inconsistent type inference on overloaded function types

  #57351 commented on Jun 14, 2025 • 0 new comments

• mapped type with remapped keys unexpectedly widens type

  #57265 commented on Jun 14, 2025 • 0 new comments

• Crash when defining `Array` type via `[]` syntax

  #57009 commented on Jun 14, 2025 • 0 new comments

• Expression produces a union type that is too complex to represent

  #53234 commented on Jun 14, 2025 • 0 new comments

• Order of ReadonlySet/ReadonlyMap in union causes differing key inference

  #52313 commented on Jun 14, 2025 • 0 new comments

• Regression in 4.8 where string union type widens to string

  #50635 commented on Jun 14, 2025 • 0 new comments

• Intersection causes incorrect type compatability

  #48720 commented on Jun 14, 2025 • 0 new comments

• Support inferring `never` as the return type in JavaScript when overriding a class method that returns `never`

  #46791 commented on Jun 14, 2025 • 0 new comments

• Typescript 4.2.x - incorrectly infered generic return type of a record union (extra undefined)

  #43943 commented on Jun 14, 2025 • 0 new comments

• Broken emit when `Infinity` or `‑Infinity` ends up in a type position

  #42905 commented on Jun 14, 2025 • 0 new comments

• Correctly handle generic functions (e.g.: `Object.freeze`) passed as callbacks to generic functions (e.g.: `Array.prototype.map`)

  #42862 commented on Jun 14, 2025 • 0 new comments

• Error when trying to assign a subclass of a base class with generics to `typeof` of that base class

  #41770 commented on Jun 14, 2025 • 0 new comments

• Compile error if I named last array destructuring element.

  #41548 commented on Jun 14, 2025 • 0 new comments

• In JSDoc @type is not a type declaration, which it is much more like type conversion.

  #39650 commented on Jun 14, 2025 • 0 new comments

• improper declared type cause narrow type not work when its computed type is not union.

  #39114 commented on Jun 14, 2025 • 0 new comments

• New Feature Requesting for `const` Parameter

  #18497 commented on May 21, 2025 • 0 new comments

• @ts-ignore for the block scope and imports

  #19573 commented on May 21, 2025 • 0 new comments

• Javascript: Object.assign to assign property values for classes is not respected

  #26792 commented on May 22, 2025 • 0 new comments

• Index signatures in type definitions: now we have `noUncheckedIndexedAccess`, include or omit `undefined`?

  #42810 commented on May 22, 2025 • 0 new comments

• Missing Handbook Content

  #59930 commented on May 22, 2025 • 0 new comments

• tsconfig - Ignore errors by ids

  #29950 commented on May 22, 2025 • 0 new comments

• I triggered the Debug assertion `Revert #54442 and add a testcase with whatever triggered this` when running with `--diagnostics`

  #61438 commented on May 22, 2025 • 0 new comments

• HOC returned component props can not differ from HOC generic props

  #28938 commented on May 23, 2025 • 0 new comments

• Request: Class Decorator Mutation

  #4881 commented on May 23, 2025 • 0 new comments

• No IntelliSense for generic literal types

  #34771 commented on May 23, 2025 • 0 new comments

• No string completions in type arguments where constrained to string literal union

  #52898 commented on May 23, 2025 • 0 new comments

• Expose design-time type information in TC39 decorator metadata when `emitDecoratorMetadata: true`

  #57533 commented on May 23, 2025 • 0 new comments

• Module resolution: NodeNext breaks typechecking

  #60561 commented on May 23, 2025 • 0 new comments

• Different behavior for type reference directive in nodenext based on whether types are in @types or not

  #47444 commented on May 23, 2025 • 0 new comments

• VSCode Find All References Not Working for Imported Functions

  #59134 commented on May 23, 2025 • 0 new comments

• Support opting-out of type narrowing on assignment

  #49669 commented on May 31, 2025 • 0 new comments

• Alias for TypeScript declaration emitting

  #30952 commented on May 15, 2025 • 0 new comments

• [Suggestion] a "const mode" where `as const` is by default for literals

  #51930 commented on May 15, 2025 • 0 new comments

• TypeScript 5.9 Iteration Plan

  #61648 commented on May 15, 2025 • 0 new comments

• Ignore non-ts/js files in move to file refactor

  #56749 commented on May 16, 2025 • 0 new comments

• base64/hex methods missing from `Uint8Array`

  #61695 commented on May 16, 2025 • 0 new comments

• C++-style `const` modifier on class members

  #58236 commented on May 16, 2025 • 0 new comments

• VSCode auto-import ignores typescript.preferences.importModuleSpecifierEnding when using a path from the package.json imports

  #60423 commented on May 17, 2025 • 0 new comments

• Excessive stack depth comparing types with TS 3.2

  #29112 commented on May 17, 2025 • 0 new comments

• Supply label names in tuple types using type-level strings

  #56093 commented on May 18, 2025 • 0 new comments

• A mixin class must have a constructor with a single rest parameter of type 'any[]'.

  #37142 commented on May 18, 2025 • 0 new comments

• Support `proposal-json-parse-with-source` (`JSON.rawJSON()`, `JSON.isRawJSON()`, `context` parameter of `reviver` function, etc...)

  #61330 commented on May 19, 2025 • 0 new comments

• Numeric Range Types (Feature Update)

  #54925 commented on May 19, 2025 • 0 new comments

• Add option to include files in type checking, but not compiling

  #54410 commented on May 19, 2025 • 0 new comments

• This JSX tag's 'children' prop expects type 'string' which requires multiple children, but only a single child was provided

  #61692 commented on May 19, 2025 • 0 new comments

• [PROPOSAL] Support @augments/@extends attached to an Object types

  #40071 commented on May 19, 2025 • 0 new comments

• suggestion: explicit "tuple" syntax

  #16656 commented on May 20, 2025 • 0 new comments

• tsconfig should support suffix `.jsonc`

  #43121 commented on May 21, 2025 • 0 new comments

• Allow type narrowing to be specified as always-on or always-off

  #57725 commented on May 31, 2025 • 0 new comments

• No semantic token assigned to import names, but available for export

  #57082 commented on May 31, 2025 • 0 new comments

• Support a @nonnull/@nonnullable JSDoc assertion comment

  #23405 commented on May 31, 2025 • 0 new comments

• Proposal: JSX.ElementType

  #13890 commented on May 31, 2025 • 0 new comments

• Generic template literal index does not resolve value type

  #50030 commented on Jun 1, 2025 • 0 new comments

• Variant accessors for index signatures and mapped types

  #43826 commented on Jun 1, 2025 • 0 new comments

• Make default JSX mode "react"

  #8529 commented on Jun 2, 2025 • 0 new comments

• TypeScript support for .mdx file extensions

  #36440 commented on Jun 3, 2025 • 0 new comments

• 'in' does not remove undefined from indexed value (with noUncheckedIndexedAccess)

  #61389 commented on Jun 3, 2025 • 0 new comments

• MSBuild integration with ASP.NET Core

  #60538 commented on Jun 4, 2025 • 0 new comments

• TS 5.8 TypeError: Cannot read properties of undefined (reading 'kind')

  #61351 commented on Jun 4, 2025 • 0 new comments

• support control flow analysis of tagged template calls

  #51426 commented on Jun 4, 2025 • 0 new comments

• [Feature Request] fieldof similar to keyof but include private and protected field

  #46802 commented on Jun 4, 2025 • 0 new comments

• Error: Debug Failure. False expression.

  #52952 commented on Jun 4, 2025 • 0 new comments

• Prevent union of enums with same values (non-narrowable unions)

  #46085 commented on Jun 5, 2025 • 0 new comments

• Format on paste deletes jsx comment content

  #61749 commented on Jun 5, 2025 • 0 new comments

• No file ending when adding import

  #60451 commented on May 23, 2025 • 0 new comments

• Thousands of false positives that seem to crash the TypeScript extension

  #60117 commented on May 23, 2025 • 0 new comments

• Rethink AutoImportProvider automatic limits

  #60704 commented on May 23, 2025 • 0 new comments

• rewriteRelativeImportExtensions does not rewrite the extension for an import expressions unless the file is detected to be a module

  #60599 commented on May 23, 2025 • 0 new comments

• Preserve ordered yield types when no logic is involved

  #43150 commented on May 24, 2025 • 0 new comments

• `inherit` keyword as shorthand to refer to super class fields and methods.

  #36165 commented on May 25, 2025 • 0 new comments

• TS 5.6 `files` missing from `--showConfig` (with absolute / ``${configDir}`` `include` paths)

  #60199 commented on May 26, 2025 • 0 new comments

• Local function variables are suggested within its default arguments

  #61461 commented on May 26, 2025 • 0 new comments

• Interface extension with omit produce incoherent results: Omit<C | D, 'a'> !== Omit<C, 'a'> | Omit<D, 'a'>

  #42680 commented on May 27, 2025 • 0 new comments

• Remapped property names has wrong completion, error messages and code actions (snippets)

  #59769 commented on May 27, 2025 • 0 new comments

• Type safety with `TemplateStringsArray` and tag functions

  #33304 commented on May 28, 2025 • 0 new comments

• MsBuild: Target `TypeScriptDeleteOutputFromOtherConfigs` can grab tsc.out from other Configuration

  #50428 commented on May 28, 2025 • 0 new comments

• Generic of abstract class should be inferrable from abstract property implemented in subclass

  #39180 commented on May 28, 2025 • 0 new comments

• Should we set '"types": []' for 'tsc init'?

  #39354 commented on May 29, 2025 • 0 new comments

• Improve inference in the presence of context-sensitive expressions

  #47599 commented on May 29, 2025 • 0 new comments

• Mapped types shouldn't transform unknown type

  #29793 commented on May 29, 2025 • 0 new comments

• Add '--bail' option when running '--build' mode

  #29938 commented on May 29, 2025 • 0 new comments