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Non-literal enum initializer has surprising behavior

Status: Open.

#63428 In microsoft/TypeScript;

· walkerburgin opened on Apr 23, 2026

Add type definition for Math.sumPrecise (ES2025 / TC39 proposal)

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.

#63427 In microsoft/TypeScript;

· 827652549 opened on Apr 23, 2026

Incorrect TS18047 Error --> "variable is possibly null"

DuplicateAn existing issue was already createdAn existing issue was already created

Status: Open.

#63426 In microsoft/TypeScript;

· PoseidonEnergy opened on Apr 23, 2026

Hover display for non-homomorphic mapped types renders numeric-string keys indistinguishably from numeric keys

Status: Open.

#63425 In microsoft/TypeScript;

· codpro2005 opened on Apr 23, 2026

@typescript/typescript6 does not proxy subpath imports

Status: Open.

#63422 In microsoft/TypeScript;

· christopher-buss opened on Apr 22, 2026

"Using type predicates" documentation promotes lying to the type system

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

Status: Open.

#63421 In microsoft/TypeScript;

· ilyash-b opened on Apr 22, 2026

union of pattern template literals intersected with optional brand mutually assignable to one with incompatible brand

BugA bug in TypeScriptA bug in TypeScript

Domain: IntersectionIncorrect behavior under `T & U` constructsIncorrect behavior under `T & U` constructs

Status: Open.

#63420 In microsoft/TypeScript;

· jcalz opened on Apr 21, 2026

·  

Backlog

Transformer that updates an ambient property declaration is emitted as non-ambient

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.

#63419 In microsoft/TypeScript;

· JoostK opened on Apr 20, 2026

JSDoc parser treats @foo inside fenced code blocks as a tag, breaking hover previews

DuplicateAn existing issue was already createdAn existing issue was already created

Status: Open.

#63416 In microsoft/TypeScript;

· BojanRatkovic opened on Apr 19, 2026

skipLibChecks specificity

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.

SuggestionAn idea for TypeScriptAn idea for TypeScript

Status: Open.

#63397 In microsoft/TypeScript;

· dragomirtitian opened on Apr 13, 2026

Review/update https://typescriptlang.org/tsconfig for TS 6.0

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

Status: Open.

#63392 In microsoft/TypeScript;

· mkantor opened on Apr 12, 2026

The module namespace object returned by __importStar is not the same when import the same module multiple times

BugA bug in TypeScriptA bug in TypeScript

Domain: JS EmitThe issue relates to the emission of JavaScriptThe issue relates to the emission of JavaScript

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

Status: Open.

#63391 In microsoft/TypeScript;

· yanjiew1 opened on Apr 12, 2026

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Dormant