declare namespace Ext {
    export namespace ux {
        export namespace ajax {
            export interface DataSimletConfig {
                responseHeaders?: object | CallableFunction;
                responseText?: string | CallableFunction;
                responseXML?: string | CallableFunction;
                status?: number | CallableFunction;
                statusText?: string | CallableFunction;
            }

            export class DataSimlet extends Ext.ux.ajax.Simlet  {
            }
        }
    }
}