calling javascript functions from unity scripts
mergeInto(LibraryManager.library {
    Loaded: function()
    {
        window.CheckLoad();
    },
}); 
/*
Unity C# script
public class blablabla : MonoBehaviour
{
    [DllImport("__Internal")]
    private static extern void Loaded();
    public static void IsLoaded()
    {
#if !UNITY_EDITOR && UNITY_WEBGL
        Loaded();
#endif
    }
    void Start()
    {
        IsLoaded();
    }
}*/