wrappers.Wrappers</code>:</p> <ul><li><code>maxDepth</code> returns a wrapper that fails queries whose depth is greater than a given value</li> <li><code>maxFields</code> returns a wrapper that fails queries whose number of fields is greater than a given value</li> <li><code>maxCost</code> returns a wrapper that fails queries when the estimated cost of execution exceeds a given value</li> <li><code>queryCost</code> returns a wrapper which adds an extension field that includes the cost of executing the query