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Spurious TS2351 with NodeNext + default import across package boundaries + non-module package.{json,json5,yaml} in parent directory

Status: Open.

#63251 In microsoft/TypeScript;

· monsanto opened on Mar 14, 2026

# Bug Report: Omit-based assertion narrowing fails to override method return types on classes with private members

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

Status: Open.

#63250 In microsoft/TypeScript;

· deyaaeldeen opened on Mar 13, 2026

Bloomberg feedback for 6.0

DiscussionIssues which may not have code impactIssues which may not have code impact

Status: Open.

#63245 In microsoft/TypeScript;

· dragomirtitian opened on Mar 12, 2026

bug(lib): Explicitly stating wrong return type of Promise.then without arguments results in no error

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.

Status: Open.

#63244 In microsoft/TypeScript;

· iluha168 opened on Mar 12, 2026

PromiseRejectedResut reason should be unknown

DuplicateAn existing issue was already createdAn existing issue was already created

Status: Open.

#63243 In microsoft/TypeScript;

· karlismelderis-mckinsey opened on Mar 12, 2026

Error from exactOptionalPropertyTypes not reported when using object spread with a ternary and optional property acces

BugA bug in TypeScriptA bug in TypeScript

Domain: flag: exactOptionalPropertyTypesBugs specific to enabling this flagBugs specific to enabling this flag

Status: Open.

#63240 In microsoft/TypeScript;

· aswinsvijay opened on Mar 11, 2026

·  

Backlog

Compiler crash: Debug Failure in visitEachChildOfIndexSignatureDeclaration

BugA bug in TypeScriptA bug in TypeScript

Domain: CrashesUnhandled exceptions/panics with no immediate primary root cause identifiedUnhandled exceptions/panics with no immediate primary root cause identified

Status: Open.

#63230 In microsoft/TypeScript;

· juanjh1 opened on Mar 10, 2026

·  

Backlog

Inference from result of generic function no longer produces a union

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

Status: Open.

#63227 In microsoft/TypeScript;

· dragomirtitian opened on Mar 10, 2026

Omit causes function to lose contextual typing

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

Status: Open.

#63225 In microsoft/TypeScript;

· dragomirtitian opened on Mar 9, 2026

Toggling isolatedModules in tsconfig.json while running the compiler in watch mode, doesn't re-emit const enums, unlike toggling preserveConstEnums, which does

BugA bug in TypeScriptA bug in TypeScript

Domain: flag: isolatedDeclarationsRelated to the --isolatedDeclarations compiler flagRelated to the --isolatedDeclarations compiler flag

Status: Open.

#63223 In microsoft/TypeScript;

· rotemdan opened on Mar 8, 2026

·  

Backlog

Allow primitive LHS to instanceof operator if RHS is a custom hasInstance

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.

#63219 In microsoft/TypeScript;

· xuld opened on Mar 7, 2026

Error (2320) when extending interfaces where a property is both readonly and readwrite.

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.

#63218 In microsoft/TypeScript;

· denis-migdal opened on Mar 7, 2026