Return jsobject or undefined

[stevenliebregt]

Hi, I'm trying to create a function, that based on some parameter returns either a JSObject or undefined/null.

The returntype I have is JsResult<JsObject> because I can't find a way to do it optional.

Is this supported?

[kjvalencik]

Yes, it is! This is documented in the type hierarchy. The JsValue type is a super type of all types. You can upcast() to a JsValue from any type to unify two different types.

fn object_or_undefined(mut cx: FunctionContext) -> JsResult<JsValue> {
    let create_object = cx.argument::<JsBoolean>(0)?.value(&mut cx);

    if create_object {
        return Ok(cx.empty_object().upcast());
    }

    Ok(cx.undefined().upcast())
}

[stevenliebregt]

Ah that makes sense, must've missed that, thanks a lot!