typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- In a class, an unique symbol attribute is sometime lost during incremental build
- DOM: `Element#matches()` incorrectly narrows types
- `default` keyword is offered in expression-bodied arrow function completions
- Narrow String#toLowerCase/toUpperCase return types via Lowercase/Uppercase
- Add type definition for Math.sumPrecise (ES2025 / TC39 proposal)
- Custom syntax for distributive conditional
- Add lib types for JSON.rawJSON, JSON.isRawJSON, and reviver context
- Confusing error message (2322), should use (2741) and (2322) error message when this["XXX"] = {...} has a missing (or mispelled) key or an incompatible value.
- Intellisense keeps crashing
- Add switch to disable _var unused variable prevention
- Docs
- TypeScript not yet supported