private class JsCall
{
    public JsCall(long id, string identifier, object[] args, object tcs, Type type)
    {
        Id = id;
        Identifier = identifier;
        Args = args;
        Tcs = tcs;
        Type = type;
    }
    public long Id { get; }
    public string Identifier { get; }
    public object[] Args { get; }
    public Type Type { get; }
    public object Tcs { get; }
}

private class JsResult
{
    public bool Success { get; set; }
    public object ReturnValue { get; set; }
    public string Error { get; set; }
}