typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- ...args should not be readonly within function body
- `unknown && false` is too loosely typed
- Improve string split return type of first array index
- The intersection of a tuple with an unrelated array is handled inconsistently
- Record keys are inferred to be values when using `extends string` conditional in a generic type
- Variables that are used-before-assigned are typed without `undefined`
- `unique symbol`s from the global `SymbolConstructor` widen way too eagerly
- Symbols produced by an alias of the Symbol constructor cannot be used as object keys in types/interfaces/classes, etc.
- Parameters created from tuple are treated as mutable instead of immutable, unless written as "...args"
- Document behavior, gotchas, etc, for public TypeChecker API
- Docs
- TypeScript not yet supported