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export modifier on enum disables This condition will always return * ts2845

Status: Open.

#63565 In Microsoft/TypeScript;

· eps1lon opened on Jun 18, 2026

Generator functions may not return IteratorObject

Status: Open.

#63561 In Microsoft/TypeScript;

· laverdet opened on Jun 16, 2026

Quadratic duplicate declaration accumulation in intersection constructor properties can crash with RangeError

Status: Open.

#63560 In Microsoft/TypeScript;

· canonic-epicure opened on Jun 16, 2026

Incorrect type resolution with nested constructors

Status: Open.

#63559 In Microsoft/TypeScript;

· Mudloop opened on Jun 16, 2026

Partial generic types get resolved completely incorrectly

Status: Open.

#63558 In Microsoft/TypeScript;

· Mudloop opened on Jun 15, 2026

Overload missing from createElementNS

Status: Open.

#63556 In Microsoft/TypeScript;

· mozesstumpf opened on Jun 15, 2026

Quadratic check time for diamond-shaped interface inheritance graphs

Status: Open.

#63555 In Microsoft/TypeScript;

· canonic-epicure opened on Jun 15, 2026

different behaviour between function and arrow function while define never return type

Status: Open.

#63553 In Microsoft/TypeScript;

· CaptainJon opened on Jun 15, 2026

Destructured function does not show outline of inner function parameters

Status: Open.

#63551 In Microsoft/TypeScript;

· aiday-mar opened on Jun 12, 2026

Duplicate function declarations in generated .d.ts for non-module JS files with allowJs + declaration

Status: Open.

#63546 In Microsoft/TypeScript;

· LangLangBart opened on Jun 10, 2026

Better ownership lint to eliminate ownership chaos for generated code

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.

#63540 In Microsoft/TypeScript;

· loynoir opened on Jun 6, 2026

Design Meeting Notes, 2026-06-04

Design NotesNotes from our design meetingsNotes from our design meetings

Status: Open.

#63533 In Microsoft/TypeScript;

· RyanCavanaugh opened on Jun 4, 2026