How to use genertic type with commond?

[Hellager]

I'm trying write a command like this to get properties in state.

#[tauri::command]
pub async fn do_something<T>(name: String, data: T, state: tauri::State<'_, MyState>) -> Result<T, ()> {
  let mut guard = state.0.lock().await;

  match name.as_str() {
    "case1" => {
        return Ok(guard.property1.clone());
    },
    "case2" => {
        return Ok(guard.property2.clone());
    },
    _ => {
        println!("no match");
    }
  }

  Err(())
}

But the compiler errors

cannot find type `T` in this scope
not found in this scope

It's ok to declare a combines type in ts like this, but it seems we can not do it in rust

interface Apple { coloe: string }
interface Car { life: number }

type CombinedAndType = Car & Apple;
type CombinedOrType = Car | Apple;

So how can i use genertic type with tauri command?

[FabianLars]

Yeah, this is indeed not possible. Rust needs to know the actual type behind the generic at compile time. So in rust you'd need a trait and have multiple structs that implement that trait and resemble your ts types. Without generics you can also just use an enum with the different fields (must implement serde::Deserialize correctly).
Edit: Now that i think about it, iirc tauri::commands don't support generics at all.

If you just want something working quickly you can use serde_json::Value which is basically a dynamic object. Then you'll have to do the type checking at runtime yourself (checking the object properties).

[Hellager]

Thanks for your answer! I will try using json instead.