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Inference is not working properly

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.

#63348 In microsoft/TypeScript;

· eduardocque opened on Apr 3, 2026

Minor performance issue when using HTMLElementTagNameMap

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

Status: Open.

#63347 In microsoft/TypeScript;

· jasonlyu123 opened on Apr 3, 2026

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

JSON.stringify should disallow BigInt value

DuplicateAn existing issue was already createdAn existing issue was already created

Status: Open.

#63333 In microsoft/TypeScript;

· wyattscarpenter opened on Apr 2, 2026

instanceof narrowing should respect type parameter bounds for covariant types

DuplicateAn existing issue was already createdAn existing issue was already created

Status: Open.

#63332 In microsoft/TypeScript;

· ethanresnick opened on Apr 1, 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

lib.dom.d.ts: Keyframe interface should allow CSS Typed Object Model objects like CSSTransformValue, etc

BugA bug in TypeScriptA bug in TypeScript

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

Help WantedYou can do thisYou can do this

Status: Open.

#63325 In microsoft/TypeScript;

· zardalt opened on Mar 30, 2026

importModuleSpecifier "shortest" does not choose shortest result among multiple matching paths aliases

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.

#63320 In microsoft/TypeScript;

· GertSallaerts opened on Mar 30, 2026

Allow structural typing of prototypes

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.

#63314 In microsoft/TypeScript;

· 5cover opened on Mar 28, 2026

Custom syntax for distributive conditional

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.

#63295 In microsoft/TypeScript;

· yarden-app opened on Mar 24, 2026