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<code>keyof FilteringMappedType</code> can't compute its constraint

Domain: Mapped TypesThe issue relates to mapped typesThe issue relates to mapped types

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Closed (completed).

#56239 In microsoft/TypeScript;

· by Andarist was closed on Jan 15, 2026

Regression: Mapped type with recursive key remapping crashes tsc with "RangeError: Maximum call stack size exceeded" in [email protected]+

BugA bug in TypeScriptA bug in TypeScript

Domain: check: Type Circularitystackoverflows caused by circularities, or unexpected errors where no circularity appears to existstackoverflows caused by circularities, or unexpected errors where no circularity appears to exist

Help WantedYou can do thisYou can do this

Status: Closed (completed).

#60476 In microsoft/TypeScript;

· by nking07049925 was closed on Jan 15, 2026

[Typo] Possible typo in JSDoc string for <code>Math.trunc(…)</code> function (lib.es2015.core.d.ts)

BugA bug in TypeScriptA bug in TypeScript

Domain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScript

Status: Closed (completed).

#63003 In microsoft/TypeScript;

· by MichaelZalla was closed on Jan 21, 2026

Fail resolution when custom condition explicitly maps specifier '.' to null

CommittedThe team has roadmapped this issueThe team has roadmapped this issue

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Closed (completed).

#62439 In microsoft/TypeScript;

· by kraenhansen was closed on Sep 25, 2025

noImplicitAny incorrectly permits 'any' when returned via arrow function

BugA bug in TypeScriptA bug in TypeScript

Help WantedYou can do thisYou can do this

Status: Closed (completed).

#7220 In microsoft/TypeScript;

· by myitcv was closed on Sep 3, 2025

Float16Array's definition is incompatible with other typedarrays

BugA bug in TypeScriptA bug in TypeScript

Domain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScript

Help WantedYou can do thisYou can do this

Status: Closed (completed).

#62343 In microsoft/TypeScript;

· by greggman was closed on Sep 9, 2025

Imported const enum is not inlined in generated code

BugA bug in TypeScriptA bug in TypeScript

Status: Closed (completed).

#16671 In microsoft/TypeScript;

· by Jessidhia was closed on Sep 9, 2025

Manually constructed nullish coalescing + OR AST is missing parentheses when printed

BugA bug in TypeScriptA bug in TypeScript

Help WantedYou can do thisYou can do this

Status: Closed (completed).

#62307 In microsoft/TypeScript;

· by JeanMeche was closed on Sep 9, 2025

Support property decorators for shorthand constructor-parameter syntax

DeclinedThe issue was declined as something which matches the TypeScript visionThe issue was declined as something which matches the TypeScript vision

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Closed (completed).

#10777 In microsoft/TypeScript;

· by lu4 was closed on Jul 22, 2025

Suggestion: treat <code>in</code> operator as type guard which asserts property existence

CommittedThe team has roadmapped this issueThe team has roadmapped this issue

Effort: ModerateRequires experience with the TypeScript codebase, but feasible. Harder than "Effort: Casual".Requires experience with the TypeScript codebase, but feasible. Harder than "Effort: Casual".

Fix AvailableA PR has been opened for this issueA PR has been opened for this issue

Help WantedYou can do thisYou can do this

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Closed (completed).

#21732 In microsoft/TypeScript;

· by jcalz was closed on Sep 19, 2022

<code>stripInternal</code> should work on single-line comments

Domain: Declaration EmitThe issue relates to the emission of d.ts filesThe issue relates to the emission of d.ts files

Effort: CasualGood issue if you're already used to contributing to the codebase. Harder than "good first issue".Good issue if you're already used to contributing to the codebase. Harder than "good first issue".

Experimentation NeededSomeone needs to try this out to see what happensSomeone needs to try this out to see what happens

Help WantedYou can do thisYou can do this

Won't FixThe severity and priority of this issue do not warrant the time or complexity needed to fix itThe severity and priority of this issue do not warrant the time or complexity needed to fix it

Status: Not planned (skipped).

#46515 In microsoft/TypeScript;

· by parzhitsky was closed on Oct 16, 2025

Completions for type arguments of expressions

Help WantedYou can do thisYou can do this

Possible ImprovementThe current behavior isn't wrong, but it's possible to see that it might be better in some casesThe current behavior isn't wrong, but it's possible to see that it might be better in some cases

Status: Closed (completed).

#61751 In microsoft/TypeScript;

· by mkantor was closed on Sep 30, 2025

Allow line break before import attributes <code>with</code> keyword

BugA bug in TypeScriptA bug in TypeScript

Help WantedYou can do thisYou can do this

Status: Closed (completed).

#62590 In microsoft/TypeScript;

· by fisker was closed on Oct 14, 2025

Unintuitive error message with 'unreachable' code

Domain: Error MessagesThe issue relates to error messagingThe issue relates to error messaging

Effort: DifficultGood luck.Good luck.

Help WantedYou can do thisYou can do this

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Closed (completed).

#10991 In microsoft/TypeScript;

· by dbaeumer was closed on Oct 23, 2025

lib.dom.d.ts - HTMLTextAreaElement, HTMLInputElement do not have "maxLength" property

BugA bug in TypeScriptA bug in TypeScript

Domain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScript

Status: Closed (completed).

#38466 In microsoft/TypeScript;

· by himanshu0128 was closed on Oct 30, 2025

Support for wildcards in command line

DeclinedThe issue was declined as something which matches the TypeScript visionThe issue was declined as something which matches the TypeScript vision

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Not planned (skipped).

#911 In microsoft/TypeScript;

· by prabirshrestha was closed on Oct 28, 2025

JSDoc function annotations not working for chain assignment

BugA bug in TypeScriptA bug in TypeScript

Domain: JavaScriptThe issue relates to JavaScript specificallyThe issue relates to JavaScript specifically

VS Code TrackedThere is a VS Code equivalent to this issueThere is a VS Code equivalent to this issue

Status: Closed (completed).

#18085 In microsoft/TypeScript;

· by mjbvz was closed on Oct 28, 2025

Allow different syntactic elements have different indentation

Help WantedYou can do thisYou can do this

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Not planned (skipped).

#2226 In microsoft/TypeScript;

· by vladima was closed on Oct 28, 2025

Define assignability relation for primitive-constrained type parameters

Help WantedYou can do thisYou can do this

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Closed (completed).

#2694 In microsoft/TypeScript;

· by RyanCavanaugh was closed on Oct 28, 2025

In JS, multiple prototype assignments give duplicate identifier error

BugA bug in TypeScriptA bug in TypeScript

Domain: JavaScriptThe issue relates to JavaScript specificallyThe issue relates to JavaScript specifically

Won't FixThe severity and priority of this issue do not warrant the time or complexity needed to fix itThe severity and priority of this issue do not warrant the time or complexity needed to fix it

Status: Not planned (skipped).

#23172 In microsoft/TypeScript;

· by sandersn was closed on Oct 29, 2025

transpileModule doesn't emit correct metadata of return type for async function

BugA bug in TypeScriptA bug in TypeScript

Domain: DecoratorsThe issue relates to the decorator syntaxThe issue relates to the decorator syntax

Help WantedYou can do thisYou can do this

Status: Not planned (skipped).

#22782 In microsoft/TypeScript;

· by bowendeng was closed on Oct 29, 2025

In JS, module.exports should support property assignments as declaration

BugA bug in TypeScriptA bug in TypeScript

checkJsRelates to checking JavaScript using TypeScriptRelates to checking JavaScript using TypeScript

Domain: JavaScriptThe issue relates to JavaScript specificallyThe issue relates to JavaScript specifically

Status: Not planned (skipped).

#22459 In microsoft/TypeScript;

· by sandersn was closed on Oct 29, 2025

[2.8.0-rc] Segfault when running compiler with --d or --watch (out of memory)

BugA bug in TypeScriptA bug in TypeScript

Domain: Declaration EmitThe issue relates to the emission of d.ts filesThe issue relates to the emission of d.ts files

Status: Not planned (skipped).

#22826 In microsoft/TypeScript;

· by canonic-epicure was closed on Oct 29, 2025

Add formatRange to Intl.DatetimeFormat

CommittedThe team has roadmapped this issueThe team has roadmapped this issue

Domain: lib.d.tsThe issue relates to the different libraries shipped with TypeScriptThe issue relates to the different libraries shipped with TypeScript

Help WantedYou can do thisYou can do this

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Closed (completed).

#46905 In microsoft/TypeScript;

· by dilyanpalauzov was closed on Feb 15, 2022

Variable declaration list comments from async functions are removed

BugA bug in TypeScriptA bug in TypeScript

Domain: API: TransformsRelates to the public transform APIRelates to the public transform API

Domain: Comment EmitThe issue relates to the emission of comments when compilingThe issue relates to the emission of comments when compiling

Effort: DifficultGood luck.Good luck.

Won't FixThe severity and priority of this issue do not warrant the time or complexity needed to fix itThe severity and priority of this issue do not warrant the time or complexity needed to fix it

Status: Not planned (skipped).

#15323 In microsoft/TypeScript;

· by JoshuaKGoldberg was closed on Oct 28, 2025