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InstanceType<T> | undefined collapses to InstanceType<T> in return type of generic method with polymorphic this

Status: Open.

#63369 In Microsoft/TypeScript;

· codextremist opened on Apr 7, 2026

Stuck in initialization loop on v1.114 w/ TS 5, also on v1.113 w/ TS 6

Status: Open.

#63367 In Microsoft/TypeScript;

· NullVoxPopuli opened on Apr 6, 2026

Inside a generic function with a remapped type as parameter, elements are wrongfully inferred as {}.

Status: Open.

#63363 In Microsoft/TypeScript;

· denis-migdal opened on Apr 6, 2026

Flatten<O> does not merge union object fields — distributes instead

QuestionAn issue which isn't directly actionable in codeAn issue which isn't directly actionable in code

Status: Open.

#63361 In Microsoft/TypeScript;

· kevalcodezee opened on Apr 6, 2026

TSX error location error with location and JSX comment

BugA bug in TypeScriptA bug in TypeScript

Status: Open.

#63358 In Microsoft/TypeScript;

· RobertSandiford opened on Apr 6, 2026

·  

Backlog

Error on function return is less useful than it should be

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.

#63357 In Microsoft/TypeScript;

· pfgithub opened on Apr 5, 2026

·  

Dormant

Declaration emit references imported type without importing it when inheriting static methods via CommonJS require

Status: Open.

#63353 In Microsoft/TypeScript;

· avivkeller opened on Apr 5, 2026

Trivial: typo

BugA bug in TypeScriptA bug in TypeScript

Status: Open.

#63352 In Microsoft/TypeScript;

· tomhamiltonlambda opened on Apr 4, 2026

·  

Backlog

Experimental (deprecated) decorators are included by default

Status: Open.

#63346 In Microsoft/TypeScript;

· OldStarchy opened on Apr 3, 2026

type checking complexity with multiple template literals in unions

Status: Open.

#63342 In Microsoft/TypeScript;

· eps1lon opened on Apr 2, 2026

Playground typing issue

Status: Open.

#63334 In Microsoft/TypeScript;

· BrandonStudio opened on Apr 2, 2026

[V6] module defaults is not esnext

DocsThe issue relates to how you learn TypeScriptThe issue relates to how you learn TypeScript

Status: Open.

#63330 In Microsoft/TypeScript;

· regseb opened on Apr 1, 2026