import { WebSocketSubjectConfig } from 'rxjs/webSocket';
import { Subject, BehaviorSubject, Observable, Subscription } from 'rxjs';
/**
 * Enum-like type representing the internal state of the WebSocket connection.
 */
type WebSocketwebSocketConnectionState = 'connecting' | 'open' | 'closed' | 'reconnecting' | 'permanently-closed';
/**
 * Extension of WebSocketSubjectConfig that includes optional reconnection parameters.
 */
interface ReconnectingWebSocketConfig<T> extends WebSocketSubjectConfig<T> {
    reconnect?: {
        initialDelayMs?: number;
        maxDelayMs?: number;
        maxRetries?: number;
    };
}
/**
 * A Subject wrapper over `WebSocketSubject` that adds automatic reconnection behavior.
 *
 * Reconnection attempts use exponential backoff with an upper delay bound.
 * The class exposes:
 * - an observable stream for connection state changes,
 * - an outgoing message buffer to prevent message loss during reconnects,
 * - and a subscription proxy for incoming messages.
 *
 * Once the maximum number of retries is exceeded (if provided), the connection transitions
 * to `permanently-closed`, completing all observables and releasing resources.
 *
 * @template T Type of message payload sent/received over the socket.
 */
export declare class ReconnectingWebSocketSubject<T> extends Subject<T> {
    webSocketConnectionState$: Observable<WebSocketwebSocketConnectionState>;
    private webSocketConnectionStateSubject;
    private outgoingBuffer;
    private incomingSubject;
    private socketSub;
    private socket;
    private reconnectAttempt;
    private reconnectTimerSub?;
    private isReconnecting;
    private config;
    constructor(config: ReconnectingWebSocketConfig<T>, webSocketConnectionStateSubject: BehaviorSubject<WebSocketwebSocketConnectionState>);
    forceReconnect(): void;
    private _connect;
    private _reconnect;
    next(value: T): void;
    error(err: any): void;
    complete(): void;
    subscribe(...args: any[]): Subscription;
    multiplex<R>(subMsg: () => T, unsubMsg: () => T, messageFilter: (value: T) => boolean): Observable<R>;
}
/**
 * Factory for creating a reconnecting WebSocket and its associated connection state stream.
 *
 * The returned socket behaves like a regular `WebSocketSubject` but includes
 * automatic reconnection with exponential backoff and a persistent state observable.
 *
 * @param config Configuration for WebSocketSubject and reconnection strategy.
 * @returns Object containing:
 *   - `webSocket$`: the ReconnectingWebSocketSubject instance.
 *   - `webSocketConnectionState$`: observable emitting connection state changes.
 */
export declare function reconnectingWebSocket<T>(config: ReconnectingWebSocketConfig<T>): {
    webSocket$: ReconnectingWebSocketSubject<T>;
    webSocketConnectionState$: Observable<WebSocketwebSocketConnectionState>;
};
export {};