declare namespace Ext {
    export namespace data {
        export namespace proxy {
            export interface SessionStorageConfig {
                batchActions?: boolean;
                batchOrder?: string;
                id?: string;
                listeners?: object;
                model?: string | Ext.data.Model;
            }

            export class SessionStorage extends Ext.data.proxy.WebStorage  {
            }
        }
    }
}