JsInterop consuming JS with a attributes

[Craig Mitchell]

I'm calling some existing JS that returns a JS Object which I've 
implemented in JsInterop:

@JsType(isNative = true, namespace = "window.CrazyGames.SDK")
public static class JsUser {
    public native Promise<CrazyGamesUser> getUser();
}

I can happily call it:
sdk.user.getUser()
  .then(user -> {
    // Do something with the user
    return null;
  })
  .catch_(error -> {
    return null;
  });

This issue is I'm struggling to work out how to define the return object 
"CrazyGamesUser".  The actual JS object is just this:
{
    "username": "SingingCheese.TLNU",
    "profilePictureUrl": 
"https://images.crazygames.com/userportal/avatars/4.png";
}

If I define it like this:

@JsType(isNative = true, namespace = JsPackage.GLOBAL)
public static class CrazyGamesUser {
  public String username;
  public String profilePictureUrl;
}

I get a java.lang.ClassCastException.

So if I set the name to "?":

@JsType(isNative = true, name = "?", namespace = JsPackage.GLOBAL)
public static class CrazyGamesUser {
  public String username;
  public String profilePictureUrl;
}

Then I get a compile error:
'?' can only be used as a name for native interfaces in the global 
namespace.

But if I make it an interface, I can't have the member variables.

If I do remove the member variables, it does work, and I can access them 
via some JSNI:

public static native String getUsername(CrazyGamesUser instance) /*-{
  return instance.username;
}-*/;

But that's really ugly.  What's the correct approach here?

Thanks.

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