<@U33H6SB2B> question: why was the `JsVirtual` / `JsValue` mechanism implemented with sealed interfa...

# javascript

[Edoardo Luppi]

@turansky question: why was the JsVirtual / JsValue mechanism implemented with sealed interfaces instead of enums.
Is that because of technical limitations of external enums?

[turansky]

1. TS enum constans aren't unique (surprise)

// valid TS enum
enum TSEnum {
    a = 1,
    b = 1,
    c = 1,
    d = 2,
    e = 2,
    ;
}

1. No enum = No runtime
2. Enum has additional properties/methods, which unions don't have
3. External enums deprecated (it's cool)