import { UmbDeepState } from './deep-state.js';
/**
 * @class UmbObjectState
 * @augments {UmbDeepState<T>}
 * @description - A RxJS BehaviorSubject which deepFreezes the object-data to ensure its not manipulated from any implementations.
 * Additionally the Subject ensures the data is unique, not updating any Observes unless there is an actual change of the content.
 *
 * The UmbObjectState provides methods to append data when the data is an Object.
 */
export declare class UmbObjectState<T> extends UmbDeepState<T> {
    /**
     * @function update
     * @param {Partial<T>} partialData - A object containing some of the data to update in this Subject.
     * @description - Append some new data to this Object.
     * @returns {UmbObjectState<T>} Reference to it self.
     * @example <caption>Example append some data.</caption>
     * const data = {key: 'myKey', value: 'myInitialValue'};
     * const myState = new UmbObjectState(data);
     * myState.update({value: 'myNewValue'});
     */
    update(partialData: Partial<T>): this;
}