import { BaseWidget, Message } from '../widgets';
/**
 * A contract for widgets that want to store and restore their inner state, between sessions.
 */
export interface StatefulWidget {
    /**
     * Called on unload to store the inner state.
     */
    storeState(): object;
    /**
     * Called when the widget got created by the storage service
     */
    restoreState(oldState: object): void;
}
export declare namespace StatefulWidget {
    function is(arg: any): arg is StatefulWidget;
}
export declare abstract class StatefulWidgetAbstract<WidgetState extends object = any> extends BaseWidget implements StatefulWidget {
    abstract readonly id: string;
    protected readonly state: WidgetState;
    protected lastSetKeys: Map<keyof WidgetState, boolean>;
    protected getDefaultState(): WidgetState;
    protected onUpdateRequest(msg: Message): void;
    setState(newState: Partial<WidgetState>, stopUpdate?: boolean): void;
    storeState(): object;
    restoreState(newState: object): void;
    isStateChanged(keys?: (keyof WidgetState)[]): boolean;
    resetState(): void;
}
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