typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- Narrowing `typeof` operator comparison by type
- Detect "partial aliased conditions" where string typeof is stored in a const, instead of boolean typeof === expression
- Extract to inner function drops narrowed type
- Type constraint checked fail when class mapped type defined by own member key
- Docs of `charCodeAt` and `codePointAt` are flipped
- Optional chaining operator infers `never` in a loop
- Option in TSConfig to include hidden/dot files
- Update expressions with untyped argument are typed `number`, not `number | bigint`
- Add a flag to specifically disallow the "lazy initialization of an empty object" pattern in checkJs mode
- Document the Iterator, Iterable, IterableIterator types
- Docs
- TypeScript not yet supported