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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

libReplacement: true lookup folder should be configurable (via typeRoots ?)

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.

#63448 In microsoft/TypeScript;

· freshp86 opened on Apr 29, 2026

symbolToNode stack overflow when using recursive types and functions with type parameters

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

Status: Open.

#63441 In microsoft/TypeScript;

· StyleShit opened on Apr 26, 2026

Paths from tsconfig are not used if declaration is on a different partition

Status: Open.

#63430 In microsoft/TypeScript;

· dragomirtitian opened on Apr 24, 2026

Add type definition for Math.sumPrecise (ES2025 / TC39 proposal)

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: Open.

#63427 In microsoft/TypeScript;

· 827652549 opened on Apr 23, 2026

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Backlog

Hover display for non-homomorphic mapped types renders numeric-string keys indistinguishably from numeric keys

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

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#63425 In microsoft/TypeScript;

· codpro2005 opened on Apr 23, 2026

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Backlog

Rename symbol renamed element declaration in node_modules

Status: Open.

#63450 In microsoft/TypeScript;

· EvertsRozz opened on Apr 21, 2026

union of pattern template literals intersected with optional brand mutually assignable to one with incompatible brand

BugA bug in TypeScriptA bug in TypeScript

Domain: IntersectionIncorrect behavior under `T & U` constructsIncorrect behavior under `T & U` constructs

Status: Open.

#63420 In microsoft/TypeScript;

· jcalz opened on Apr 21, 2026

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Backlog

skipLibChecks specificity

Needs ProposalThis issue needs a plan that clarifies the finer details of how it could be implemented.This issue needs a plan that clarifies the finer details of how it could be implemented.

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#63397 In microsoft/TypeScript;

· dragomirtitian opened on Apr 13, 2026

Review/update https://typescriptlang.org/tsconfig for TS 6.0

DocsThe issue relates to how you learn TypeScriptThe issue relates to how you learn TypeScript

Status: Open.

#63392 In microsoft/TypeScript;

· mkantor opened on Apr 12, 2026

The module namespace object returned by __importStar is not the same when import the same module multiple times

BugA bug in TypeScriptA bug in TypeScript

Domain: JS EmitThe issue relates to the emission of JavaScriptThe issue relates to the emission of JavaScript

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

Status: Open.

#63391 In microsoft/TypeScript;

· yanjiew1 opened on Apr 12, 2026

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Dormant