typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- Control flow analysis for dependent parameters only works when checking against literals
- Recursive types can depend on presence and source location of unused type declaration
- When evaluating whether a generic is assignable to a generic, it depends on the type order.
- cannot redeclare block scoped variable postMessage()
- Certain conditional types allow unsound assignments
- Use single-assignment variables for intermediate values needed in JS output for decorated classes
- API `getSemanticDiagnostics` reports wrong error for code extends interface in namespace
- Common property check isn't performed when the target has any index signature
- Disallow comparisons between identical unit types.
- Use `...args: never` in builtin conditional type helpers
- Docs
- TypeScript not yet supported