public static IRequestExecutorBuilder AddDirectiveMergeHandler <T>(
this IRequestExecutorBuilder builder)
where T : class, IDirectiveMergeHandler
{
if (builder == null)
{
throw new ArgumentNullException(nameof(builder));
}
return(builder.AddDirectiveMergeRule(
SchemaMergerExtensions.CreateDirectiveMergeRule <T>()));
}