import { ErrorState, ErrorStateWithValue, LoadedState, LoadingState, LoadingStateWithValue } from './model';
import { HttpErrorResponse } from '@angular/common/http';
/**
 * Returns a new LoadingState instance with an optional last-known value.
 *
 * @param value may be provided to indicate the previously-loaded, or last-known, state
 */
export declare function loadingState<T>(value: T): LoadingStateWithValue<T>;
export declare function loadingState<T = never>(): LoadingState<T>;
/**
 * Returns a new LoadedState instance, with the optional value as the loaded data.
 *
 * @param value
 */
export declare function loadedState<T>(value: T): LoadedState<T>;
/**
 * Returns a new ErrorState instance with the given error and optional last-known value.
 *
 * @param error
 * @param value may be provided to indicate the previously-loaded, or last-known, state
 */
export declare function errorState<T>(error: HttpErrorResponse | Error, value: T): ErrorStateWithValue<T>;
export declare function errorState<T = never>(error: HttpErrorResponse | Error): ErrorState<T>;