declare namespace Ext {
    export namespace state {
        export interface StatefulConfig {
            saveDelay?: number;
            stateEvents?: string[];
            stateful?: boolean | object;
            stateId?: string;
        }

        export class Stateful extends Ext.Base  {
            public addStateEvents(events?: string | string[]): void;
            public applyState(state?: object): void;
            public getState(): object;
            public getStateful(): void;
            public savePropToState(propName?: string, state?: object, stateName?: string): boolean;
            public savePropsToState(propNames?: string | string[], state?: object): object;
            public saveState(): void;
            public setStateful(): void;
        }
    }
}