typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- Mapped tuples types iterates over all properties
- TypeScript doesn't narrow out `undefined` after constructor call when callee is `any`
- Type inference/narrowing lost after assignment
- Can't use type aliases or conditional types resolving to Promise for async/await return types
- Allow to explicitly pass type parameters via JSDoc
- TS2367: This condition will always return 'false' since the types 'Constructor<T>' and 'typeof Child' have no overlap.
- Subclass method is not allowed (TS2425) if the parent class has a property of type any with the same name
- JSON type
- Feature Request: "extends oneof" generic constraint; allows for narrowing type parameters
- Object spread drops index signature
- Docs
- TypeScript not yet supported