typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- Design Meeting Notes, 2026-09-01
- `sourceMap` emit is disproportionately slow for files containing one very large object literal
- Add typed array constructor regression coverage
- Implement workspace/diagnostics
- Add the outputExtension compiler option
- Fix add missing JSDoc to ES2015 Collection Map and WeakMap
- Design Meeting Notes, 2026-08-27
- Proposal: Expose LSP/Language Service capabilities (e.g., rename) via a tsc subcommand
- tsconfig `include` silently drops `Foo.tsx` when `foo.ts` exists, on a case-insensitive filesystem
- Fixed an issue with mapped property symbol not displaying added `| undefined` when its origin symbol was optional
- Docs
- TypeScript not yet supported