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tsc may fail to report error when file.js & file.d.ts coexist, even when @ts-check is added on file.js.

Status: Open.

#63523 In microsoft/TypeScript;

· hkleungai opened on Jun 1, 2026

Declarations that shadow global Symbol break emit for using declarations

Status: Open.

#63522 In microsoft/TypeScript;

· DanielRosenwasser opened on Jun 1, 2026

Reassigning of inferred object with Indexed access value does not widen it's type

Status: Open.

#63514 In microsoft/TypeScript;

· svenvandescheur opened on May 29, 2026

Missing JSDoc annotations in esnext lib declaration files

Status: Open.

#63512 In microsoft/TypeScript;

· Se3do opened on May 28, 2026

Font bug

Needs More InfoThe issue still hasn't been fully clarifiedThe issue still hasn't been fully clarified

Status: Open.

#63507 In microsoft/TypeScript;

· Liam1-dev opened on May 26, 2026

Wildcard package.json exports auto-import path does not apply traversal containment checks

BugA bug in TypeScriptA bug in TypeScript

Domain: LS: Auto-import

Status: Open.

#63499 In microsoft/TypeScript;

· zainnadeem786 opened on May 22, 2026

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Backlog

js/ts.preferences.autoImportFileExcludePatterns is not reflected promptly in IntelliSense suggestions

Needs InvestigationThis issue needs a team member to investigate its status.This issue needs a team member to investigate its status.

Status: Open.

#63498 In microsoft/TypeScript;

· heroboy opened on May 21, 2026

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Backlog

DOM: Element#matches() incorrectly narrows types

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: Open.

#63497 In microsoft/TypeScript;

· Derugon opened on May 20, 2026

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Backlog

ReadonlySet lacks documentation for has, forEach and size

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

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: Open.

#63481 In microsoft/TypeScript;

· Bertie690 opened on May 15, 2026

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Backlog

default keyword is offered in expression-bodied arrow function completions

BugA bug in TypeScriptA bug in TypeScript

Domain: LS: Completion ListsThe issue relates to showing completion lists in an editorThe issue relates to showing completion lists in an editor

Status: Open.

#63463 In microsoft/TypeScript;

· DhineshPonnarasan opened on May 9, 2026

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Backlog

String.split() method's separator argument should allow undefined

Awaiting More FeedbackThis means we'd like to hear from more people who would be helped by this featureThis means we'd like to hear from more people who would be helped by this feature

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#63456 In microsoft/TypeScript;

· JohanRonnblom opened on May 1, 2026

new super() in static method does not cause error

BugA bug in TypeScriptA bug in TypeScript

Domain: classesBehavior of various `class` constructs, e.g. mixins or base classesBehavior of various `class` constructs, e.g. mixins or base classes

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

Status: Open.

#63451 In microsoft/TypeScript;

· Withered-Flower-0422 opened on Apr 30, 2026

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Dormant