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Crash: Debug Failure. False expression in getArgumentArityError when resolving overloaded decorators with --experimentalDecorators

Status: Open.

#63094 In microsoft/TypeScript;

· na7ure-a opened on Feb 4, 2026

Crash: RangeError: Maximum call stack size exceeded in checkExpression when resolving property access on parenthesized type assertions with generic-like syntax

Status: Open.

#63093 In microsoft/TypeScript;

· na7ure-a opened on Feb 4, 2026

Crash: RangeError: Maximum call stack size exceeded in isReachableFlowNodeWorker with complex for loop headers

Status: Open.

#63092 In microsoft/TypeScript;

· na7ure-a opened on Feb 4, 2026

Crash: RangeError: Maximum call stack size exceeded when destructuring undefined/unknown as identifiers in parameter list

Status: Open.

#63091 In microsoft/TypeScript;

· na7ure-a opened on Feb 4, 2026

Crash: RangeError: Maximum call stack size exceeded during type serialization of recursive distributive mapped types

Status: Open.

#63090 In microsoft/TypeScript;

· na7ure-a opened on Feb 4, 2026

Function property in union does not get parameter type inferred from result of type narrowing

Status: Open.

#63088 In microsoft/TypeScript;

· dyantako opened on Feb 4, 2026

TypeScript 6.0 Iteration Plan

PlanningIteration plans and roadmappingIteration plans and roadmapping

Status: Open.

#63085 In microsoft/TypeScript;

· DanielRosenwasser opened on Feb 3, 2026

Add support for OSC8 hyperlinks in TTY output

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.

#63082 In microsoft/TypeScript;

· matthieusieben opened on Feb 3, 2026

<code>x is any</code> type guard widens <code>unknown</code> type even after the relevant scope has been exited

Not a DefectThis behavior is one of several equally-correct optionsThis behavior is one of several equally-correct options

Status: Open.

#63074 In microsoft/TypeScript;

· coreywoodfield opened on Jan 31, 2026

Make standard library types more polyfills‑friendly

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

In DiscussionNot yet reached consensusNot yet reached consensus

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#63069 In microsoft/TypeScript;

· slowcheetah opened on Jan 30, 2026

<code>export type</code> vs <code>export { type }</code> with augmentations

Not a DefectThis behavior is one of several equally-correct optionsThis behavior is one of several equally-correct options

Status: Open.

#63061 In microsoft/TypeScript;

· skirtles-code opened on Jan 28, 2026

Narrow object property indexed by another object's property of unique symbol type (like <code>Symbol.iterator</code>)

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.

#63059 In microsoft/TypeScript;

· jcalz opened on Jan 28, 2026