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6.0 Migration Guide

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

Status: Open.

#62508 In microsoft/TypeScript;

· RyanCavanaugh opened on Sep 29, 2025

[ServerErrors][TypeScript] 6.0.0-dev.20250928 vs 5.9.2

Status: Open.

#62506 In microsoft/TypeScript;

· typescript-bot opened on Sep 28, 2025

Array of intersection is not intersection of arrays

DuplicateAn existing issue was already createdAn existing issue was already created

Status: Open.

#62505 In microsoft/TypeScript;

· jsalvata opened on Sep 28, 2025

[ServerErrors][JavaScript] 6.0.0-dev.20250928 vs 5.9.2

Status: Open.

#62504 In microsoft/TypeScript;

· typescript-bot opened on Sep 28, 2025

[NewErrors] 6.0.0-dev.20250928 vs 5.9.2

Status: Open.

#62503 In microsoft/TypeScript;

· typescript-bot opened on Sep 28, 2025

Pick keyword as an alternative to extends for generics

DeclinedThe issue was declined as something which matches the TypeScript visionThe issue was declined as something which matches the TypeScript vision

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#62500 In microsoft/TypeScript;

· SMJSGaming opened on Sep 28, 2025

Consider adopting npm trusted publishing

InfrastructureIssue relates to TypeScript team infrastructureIssue relates to TypeScript team infrastructure

Status: Open.

#62499 In microsoft/TypeScript;

· JamieMagee opened on Sep 28, 2025

Support alias for undefined in type annotation for local variable in a function

DuplicateAn existing issue was already createdAn existing issue was already created

Status: Open.

#62498 In microsoft/TypeScript;

· hannah23280 opened on Sep 28, 2025

Code snippets on devblogs.microsoft.com for Typescript 4.5 in dark mode are broken

Won't FixThe severity and priority of this issue do not warrant the time or complexity needed to fix itThe severity and priority of this issue do not warrant the time or complexity needed to fix it

Status: Open.

#62497 In microsoft/TypeScript;

· spanishpear opened on Sep 28, 2025

When you get the value of <code>object</code> followed by <code>?</code> ,The type of key is not limited to object key. because I've explicitly handled the case where I can't get it.

Working as IntendedThe behavior described is the intended behavior; this is not a bugThe behavior described is the intended behavior; this is not a bug

Status: Open.

#62493 In microsoft/TypeScript;

· yuntian001 opened on Sep 26, 2025

Completion after initialized class property with <code>const</code> assertion and no semicolon

Domain: Completion ListsThe issue relates to showing completion lists in an editorThe issue relates to showing completion lists in an editor

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.

#62487 In microsoft/TypeScript;

· mpal9000 opened on Sep 25, 2025

· 

Backlog

Type hinting remains slow after version 5.9.2

Needs More InfoThe issue still hasn't been fully clarifiedThe issue still hasn't been fully clarified

Status: Open.

#62484 In microsoft/TypeScript;

· wszgrcy opened on Sep 25, 2025