typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- Possible regression in error elaboration for optional properties
- Import autocomplete in jsdoc removes everything after the import.
- ban usages of `@ts-expect-error` and `@ts-ignore` in places that would get stripped when emitting `.d.ts` files
- [lib] readonly modifier is missing in a lot of places
- TypeScript 4.6 regression
- Conditional type evaluation of type aliases produces different result than their equivalent substitution
- Argument becomes implicit any when a void-returning overload follows a non-void-returning signature
- Support for declaring index signatures using JSDoc
- tsc build declarationMap generates incorrect mappings from JSDoc
- Selectively opting in to `exactOptionalPropertyTypes`
- Docs
- TypeScript not yet supported