declare namespace Ext {
    export namespace promise {
        export interface DeferredConfig {
        }

        export class Deferred extends Ext.Base  {
            public promise?: Ext.promise.Promise;
            public reject(reason?: Error): void;
            public resolve(value?: any): void;
            public then(onFulfilled?: CallableFunction, onRejected?: CallableFunction, onProgress?: CallableFunction): void;
            public update(progress?: any): void;
        }
    }
}