typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- Fixed inferred type widening with contextual types created by binding patterns
- Treat `switch (typeof x)` as exhaustive when all cases are handled for unconstrained type parameter
- Type can't `keyof`
- Keep returned (and yielded) literal types as const when their types using `const` type variables
- Native Node.js Integration/Support
- `@type {const}` produces namespace in .d.ts instead of normal object type
- switch (typeof something) isn't seen as exhaustive
- Option to use "moduleResolution": "NodeNext" with new "module" value that outputs ESM code
- Exported const type parameters is not renamed in constraint in another const in type declarations
- Incorrect inferred function return type with destructuring assignments
- Docs
- TypeScript not yet supported