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Meta-IssueAn issue about the team, or the direction of TypeScriptAn issue about the team, or the direction of TypeScript

Status: Open.

#62623 In microsoft/TypeScript;

· RyanCavanaugh opened on Oct 17, 2025

Array.[Symbol.iterator]() information lost when combining discriminated union with Array subclass (TS2488)

DuplicateAn existing issue was already createdAn existing issue was already created

Status: Open.

#62621 In microsoft/TypeScript;

· nrainhart opened on Oct 17, 2025

Plugin probe path starts in incorrect location?

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

Status: Open.

#62618 In microsoft/TypeScript;

· benjamind opened on Oct 16, 2025

Design Meeting Notes, 10/10/2025

Design NotesNotes from our design meetingsNotes from our design meetings

Status: Open.

#62617 In microsoft/TypeScript;

· DanielRosenwasser opened on Oct 16, 2025

Design Meeting Notes, 10/7/2025

Design NotesNotes from our design meetingsNotes from our design meetings

Status: Open.

#62616 In microsoft/TypeScript;

· DanielRosenwasser opened on Oct 16, 2025

Design Meeting Notes, 9/26/2025

Design NotesNotes from our design meetingsNotes from our design meetings

Status: Open.

#62615 In microsoft/TypeScript;

· DanielRosenwasser opened on Oct 16, 2025

Private constructor in mixin causes "Cannot read properties of undefined (reading 'declarations')"

BugA bug in TypeScriptA bug in TypeScript

Help WantedYou can do thisYou can do this

Status: Open.

#62614 In microsoft/TypeScript;

· maxpatiiuk opened on Oct 16, 2025

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Backlog

{Map,Object}.groupBy(): type narrowing support

SuggestionAn idea for TypeScriptAn idea for TypeScript

Too ComplexAn issue which adding support for may be too complex for the value it addsAn issue which adding support for may be too complex for the value it adds

Status: Open.

#62613 In microsoft/TypeScript;

· mfulton26 opened on Oct 16, 2025

Typescript Type Resolution Fails with generics of T | null

Domain: Type DisplayBugs relating to showing types in Quick Info/Tooltips, Signature Help, or Completion InfoBugs relating to showing types in Quick Info/Tooltips, Signature Help, or Completion Info

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.

#62608 In microsoft/TypeScript;

· adminnz opened on Oct 16, 2025

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Backlog

Changing property declaration order causes error

BugA bug in TypeScriptA bug in TypeScript

Domain: Variance RelationshipsThe issue relates to variance relationships between typesThe issue relates to variance relationships between types

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

Status: Open.

#62606 In microsoft/TypeScript;

· ahejlsberg opened on Oct 15, 2025

Unexpected error message when assigning object values with wider discriminator property type

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

Status: Open.

#62603 In microsoft/TypeScript;

· janpaepke opened on Oct 15, 2025

JSDoc/TSDoc <code>@link</code> hover for same-file symbols drops <code>@remarks</code> and all tags from Quick Info

Domain: Quick Infoe.g. hover text, tool-tips, and tooltips.e.g. hover text, tool-tips, and tooltips.

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.

#62602 In microsoft/TypeScript;

· dkamins opened on Oct 15, 2025

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Backlog