typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- Improve logic that chooses co- vs. contra-variant return type inferences
- Fix Callback argument type not inferred for union of interfaces #59309
- Use numeric literals for BYTES_PER_ELEMENT
- Don't special case nullable types in `isTypeEqualityComparableTo`
- consistently check expressions with >, >=, <, <= for unconstrained types in strictNullChecks
- ⚡ Performance: Project service doesn't cache all fs.statSync
- add excess property checks to spread objects defined inline
- Optimize `scan` with a lookup table to reduce branching
- unconstrained type parameters are consistently checked for `{} | null | undefined` in `strictNullChecks`
- Isolated Declarations in TS 5.5: State of the feature
- Docs
- TypeScript not yet supported