typescript
https://github.com/microsoft/typescript
TypeScript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
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- Issues
- Bad MDN URL references for ValidityState
- discriminated union type matching behaviour changed starting from 5.2.x
- Mapped types created from reverse mapped types with union/intersection constraints don't have declaration linked
- Generic type comparison results in incorrect error when inferring from undefined type
- TypeScript cannot always infer the correct type through a user-defined type guard using the 'is' operator.
- Go To Definition / IntelliSense: Same name for value and type breaks "Go To Definition" of the declared variables.
- Add structure to diagnostics to enable nicer diagnostic output and interactivity in tooling such as IDEs
- unique symbol + interface + mixin causes TS4058 ("but cannot be named")
- Wrong error message for testing `void` with `??`
- Function apply does not accept `arguments`
- Docs
- TypeScript not yet supported