public static TBuilder WithOptionalVariable <TBuilder, TValue>(this IGraphQLBuilder builder, string name, TValue value, Func <TValue, bool> nullCheck = null)
where TBuilder : IGraphQLBuilder
{
if (nullCheck == null)
{
nullCheck = v => value == null;
}
if (nullCheck(value))
{
return((TBuilder)builder);
}
return(builder.WithVariable <TBuilder>(name, value));
}