/**
 * Marks a property as client/user state variable.
 * Hence, the decorated property may not be the same for all users.
 *
 * By using normal access (`this.prop`), the user will get only its changes
 * last state, done on the property.
 *
 * @export
 * @param {IBotStateSettings} [properties] The properties of the decorator.
 * @returns A property decorator.
 */
export declare function state(properties?: IBotStateSettings): (target: any, propName: string, _descriptor?: any) => void;