import type { MappingFunction, MemoizationFunction } from '../types/index.js';
import { UmbBasicState } from './basic-state.js';
/**
 * @class UmbStringState
 * @augments {UmbBasicState<T>}
 * @description - A state holding string data, this ensures the data is unique, not updating any Observes unless there is an actual change of the value, by using `===`.
 */
export declare class UmbStringState<T> extends UmbBasicState<T | string> {
    constructor(initialData: T | string);
    asObservablePart<ReturnType>(mappingFunction: MappingFunction<T | string, ReturnType>, memoizationFunction?: MemoizationFunction<ReturnType>): import("rxjs").Observable<ReturnType>;
}