How can I handle errors from rust side?

[webmstk]

Documentation:
https://v2.tauri.app/develop/calling-rust/#error-handling

#[tauri::command]
fn login(user: String, password: String) -> Result<String, String> {
  if user == "tauri" && password == "tauri" {
    // resolve
    Ok("logged_in".to_string())
  } else {
    // reject
    Err("invalid credentials".to_string())
  }
}

If the command returns an error, the promise will reject, otherwise, it resolves:

invoke('login', { user: 'tauri', password: '0j4rijw8=' })
  .then((message) => console.log(message))
  .catch((error) => console.error(error));

In rust I have:

#[wasm_bindgen]
extern "C" {
    #[wasm_bindgen(js_namespace = ["window", "__TAURI__", "core"])]
    async fn invoke(cmd: &str, args: JsValue) -> JsValue;
}

let result = invoke("login", args).await;

The result is JsValue. It can be "logged_in" or "invalid credentials". What is idiomatic way to handle error-case?

[KimdowEin]

#[wasm_bindgen(catch)]
pub fn async invoke ... -> Result<Jsvalue,Jsvalue>

more info from wasm-bindgen book(I forget the url), or ask me and I will response when I get my computer

[webmstk]

Thank you, @KimdowEin !

https://rustwasm.github.io/wasm-bindgen/reference/attributes/on-js-imports/catch.html

#[wasm_bindgen]
extern "C" {
    #[wasm_bindgen(js_namespace = ["window", "__TAURI__", "core"])]
    async fn invoke(cmd: &str, args: JsValue) -> JsValue;

    #[wasm_bindgen(js_namespace = ["window", "__TAURI__", "core"], js_name = invoke, catch)]
    async fn try_invoke(cmd: &str, args: JsValue) -> Result<JsValue, JsValue>;

    #[wasm_bindgen(js_namespace = ["window", "__TAURI__", "core"], js_name = invoke)]
    async fn invoke_without_args(cmd: &str) -> JsValue;

    #[wasm_bindgen(js_namespace = ["window", "__TAURI__", "core"], js_name = invoke, catch)]
    async fn try_invoke_without_args(cmd: &str) -> Result<JsValue, JsValue>;
}

It seems to work