Comparison of different enumeration types error

🔍 Search Terms

"enums", "enum comparison"

✅ Viability Checklist

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
• This isn't a request to add a new utility type: https://github.com/microsoft/TypeScript/wiki/No-New-Utility-Types
• This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals

⭐ Suggestion

Show type-check error on different enumeration types comparing

📃 Motivating Example

enum Month {
    Jan, Feb, Mar, Apr, May, Jun,
    Jul, Aug, Sep, Oct, Nov, Dec
}

enum Week { Mon, Tue, Wed, Thu, Fri, Sat, Sun }

console.log('Month vs Month', Month.May > Month.Nov) // false
console.log('Week vs Week', Week.Wed > Week.Mon) // true

console.log('Equals', Week.Sun === Month.Nov) // false (type-check error)
console.log('Week vs Month', Week.Sun > Month.Nov) // false (expected type-check error?)

Comparing the equality of different enums results a type-check error:

This comparison appears to be unintentional because the types 'Week' and 'Month' have no overlap. (2367)

But no error on >, < or >=, <=

Error examples:
C

Rust

💻 Use Cases

1. What do you want to use this for?
   Comparison operations between non-overlapping enum types

Comienza reproduciendo los ejemplos de comparación de enum del issue en un caso de prueba de TypeScript y compara el diagnóstico de igualdad existente con los operadores relacionales. El cambio estará completo cuando las comparaciones entre tipos enum distintos produzcan de forma coherente el error de comprobación de tipos previsto sin cambiar el comportamiento del JavaScript generado.