typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- lib: fix JSDoc @param tags that document nothing
- `importHelpers` incorrectly requires `tslib` for native `#private` class members at every dated `target` (ES2022–ES2025), even though no helper is ever emitted
- --incremental: after a pnpm dependency version change, the cached run is slower than a cold run and most of the time is unattributed
- Type argument with a subset of the parameter constraint's optional keys incorrectly reported as unassignable to constraint
- fix(lib): rectify docs error for Array.prototype.at
- Type narrowing not working correctly with Uppercase<string> & Lowercase<string>
- TS1518 depends on operand order in negated v-mode class unions
- `Array.prototype.at` docs use "code unit" instead of "item"
- It is possible to violate generic constraints when distributing union types
- Property lookups on arguments to type parameters constrained by string index signatures can violate other constraints because undefined is included for optional properties
- Docs
- TypeScript not yet supported