import { RegisteredReducer } from './reducer';
import { ObservableState } from './observableState';
import { ReducedStreamOptions } from './internal/reducedStream';
/**
 * Creates and registers a persistent reduced state stream
 *
 * This stream scans over an action stream and other streams to build up state.
 * It exposes its latest value through `.state`
 *
 * To start reducing state and subscribe to the action$, you must first call
 * `.startReducing(action$)` on the stream.
 * Because the stream will be registered in the stateStreamRegistry,
 * `startReducing` will be invoked on this stream when
 * `stateStreamRegistry.startReducing(action$)` is called.
 *
 * The stream is intended to be used for persistent application state that is
 * started at application init and persisted throughout the application's lifecycle.
 *
 * ```
 * const myState$ = persistentReducedStream(
 *   'myState$',
 *   initialState,
 *   reducers
 * );
 *
 * myState$.value === initialState // Will be true
 *
 * myState$.startReducing(action$) // To start reducing
 * ```
 *
 * @param name The name of the stream, used for placing a spy tag
 * @param initialState The initial state of the stream
 * @param reducers The reducers that build up the stream state
 */
export declare const persistentReducedStream: <State>(name: string, initialState: State, reducers: RegisteredReducer<State, any>[], options?: ReducedStreamOptions) => ObservableState<State>;